添加rtthread相关代码

riscv/rtthread/components/drivers/ofw/Kconfig

@@ -0,0 +1,22 @@
+menuconfig RT_USING_OFW
+    bool "Using Open Firmware (OFW)"
+    select RT_USING_ADT
+    select RT_USING_ADT_REF
+    select RT_USING_ADT_BITMAP
+    depends on RT_USING_DM
+    default n
+
+config RT_USING_BUILTIN_FDT
+    bool "Using builtin fdt in kernel"
+    depends on RT_USING_OFW
+    default n
+
+config RT_BUILTIN_FDT_PATH
+    string "Builtin fdt path, will rebuild if have dts"
+    depends on RT_USING_BUILTIN_FDT
+    default "rtthread.dtb"
+
+config RT_FDT_EARLYCON_MSG_SIZE
+    int "Earlycon message buffer size (KB)"
+    depends on RT_USING_OFW
+    default 128

riscv/rtthread/components/drivers/ofw/SConscript

@@ -0,0 +1,25 @@
+from building import *
+
+objs = []
+
+if not GetDepend(['RT_USING_OFW']):
+    Return('objs')
+
+cwd     = GetCurrentDir()
+list    = os.listdir(cwd)
+CPPPATH = [cwd, cwd + '/../include']
+
+src     = Glob('*.c')
+
+if GetDepend('RT_USING_PIC') == False:
+    SrcRemove(src, ['irq.c'])
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+for d in list:
+    path = os.path.join(cwd, d)
+    if os.path.isfile(os.path.join(path, 'SConscript')):
+        objs = objs + SConscript(os.path.join(d, 'SConscript'))
+objs = objs + group
+
+Return('objs')

riscv/rtthread/components/drivers/ofw/io.c

@@ -0,0 +1,436 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-08-25     GuEe-GUI     first version
+ */
+
+#include <rtthread.h>
+
+#include <drivers/ofw.h>
+#include <drivers/ofw_io.h>
+#include <drivers/ofw_fdt.h>
+
+#define DBG_TAG "rtdm.ofw"
+#define DBG_LVL DBG_INFO
+#include <rtdbg.h>
+
+#include "ofw_internal.h"
+
+static int ofw_bus_addr_cells(struct rt_ofw_node *np)
+{
+    int res = OFW_ROOT_NODE_ADDR_CELLS_DEFAULT;
+
+    for (rt_uint32_t cells; np; np = np->parent)
+    {
+        if (!rt_ofw_prop_read_u32(np, "#address-cells", &cells))
+        {
+            res = cells;
+            break;
+        }
+    }
+
+    return res;
+}
+
+static int ofw_bus_size_cells(struct rt_ofw_node *np)
+{
+    int res = OFW_ROOT_NODE_SIZE_CELLS_DEFAULT;
+
+    for (rt_uint32_t cells; np; np = np->parent)
+    {
+        if (!rt_ofw_prop_read_u32(np, "#size-cells", &cells))
+        {
+            res = cells;
+            break;
+        }
+    }
+
+    return res;
+}
+
+int rt_ofw_bus_addr_cells(struct rt_ofw_node *np)
+{
+    return np ? ofw_bus_addr_cells(np) : -RT_EINVAL;
+}
+
+int rt_ofw_bus_size_cells(struct rt_ofw_node *np)
+{
+    return np ? ofw_bus_size_cells(np) : -RT_EINVAL;
+}
+
+int rt_ofw_io_addr_cells(struct rt_ofw_node *np)
+{
+    return np ? ofw_bus_addr_cells(np->parent ? np->parent : np) : -RT_EINVAL;
+}
+
+int rt_ofw_io_size_cells(struct rt_ofw_node *np)
+{
+    return np ? ofw_bus_size_cells(np->parent ? np->parent : np) : -RT_EINVAL;
+}
+
+int rt_ofw_get_address_count(struct rt_ofw_node *np)
+{
+    int count;
+
+    if (np)
+    {
+        rt_ssize_t len;
+
+        count = 0;
+
+        if (rt_ofw_get_prop(np, "reg", &len))
+        {
+            count = len / (sizeof(fdt32_t) * (rt_ofw_io_addr_cells(np) + rt_ofw_io_size_cells(np)));
+        }
+    }
+    else
+    {
+        count = -RT_EINVAL;
+    }
+
+    return count;
+}
+
+static rt_err_t ofw_get_address(struct rt_ofw_node *np, int index, rt_uint64_t *out_address, rt_uint64_t *out_size)
+{
+    rt_ssize_t len;
+    rt_err_t err = RT_EOK;
+    int addr_cells = rt_ofw_io_addr_cells(np);
+    int size_cells = rt_ofw_io_size_cells(np);
+    int skip_cells = (addr_cells + size_cells) * index;
+    const fdt32_t *cell = rt_ofw_prop_read_raw(np, "reg", &len);
+
+    if (cell && skip_cells < (len / sizeof(*cell)))
+    {
+        cell += skip_cells;
+        *out_address = rt_fdt_next_cell(&cell, addr_cells);
+        *out_address = rt_ofw_translate_address(np, RT_NULL, *out_address);
+        *out_size = rt_fdt_read_number(cell, size_cells);
+    }
+    else
+    {
+        err = -RT_EINVAL;
+    }
+
+    return err;
+}
+
+rt_err_t rt_ofw_get_address(struct rt_ofw_node *np, int index, rt_uint64_t *out_address, rt_uint64_t *out_size)
+{
+    rt_err_t err;
+
+    if (np && index >= 0 && (out_address || out_size))
+    {
+        rt_uint64_t address, size;
+
+        err = ofw_get_address(np, index, &address, &size);
+
+        if (!err)
+        {
+            if (out_address)
+            {
+                *out_address = address;
+            }
+            if (out_size)
+            {
+                *out_size = size;
+            }
+        }
+    }
+    else
+    {
+        err = -RT_EINVAL;
+    }
+
+    return err;
+}
+
+static rt_err_t ofw_get_address_by_name(struct rt_ofw_node *np, const char *name,
+        rt_uint64_t *out_address, rt_uint64_t *out_size)
+
+{
+    int index = 0;
+    rt_err_t err = -RT_EEMPTY;
+    const char *reg_name;
+    struct rt_ofw_prop *prop;
+
+    rt_ofw_foreach_prop_string(np, "reg-names", prop, reg_name)
+    {
+        if (!rt_strcmp(name, reg_name))
+        {
+            err = rt_ofw_get_address(np, index, out_address, out_size);
+
+            break;
+        }
+
+        ++index;
+    }
+
+    return err;
+}
+
+rt_err_t rt_ofw_get_address_by_name(struct rt_ofw_node *np, const char *name,
+        rt_uint64_t *out_address, rt_uint64_t *out_size)
+{
+    rt_err_t err;
+
+    if (np && name && (out_address || out_size))
+    {
+        rt_uint64_t address, size;
+
+        err = ofw_get_address_by_name(np, name, &address, &size);
+
+        if (!err)
+        {
+            if (out_address)
+            {
+                *out_address = address;
+            }
+            if (out_size)
+            {
+                *out_size = size;
+            }
+        }
+    }
+    else
+    {
+        err = -RT_EINVAL;
+    }
+
+    return err;
+}
+
+int rt_ofw_get_address_array(struct rt_ofw_node *np, int nr, rt_uint64_t *out_regs)
+{
+    int count;
+
+    if (np && nr > 0 && out_regs)
+    {
+        rt_ssize_t len;
+        int max_nr;
+        int addr_cells = rt_ofw_io_addr_cells(np);
+        int size_cells = rt_ofw_io_size_cells(np);
+        const fdt32_t *cell = rt_ofw_prop_read_raw(np, "reg", &len);
+
+        max_nr = len / (sizeof(*cell) * (addr_cells + size_cells));
+
+        if (nr > max_nr)
+        {
+            nr = max_nr;
+        }
+
+        count = nr;
+
+        while (nr --> 0)
+        {
+            *out_regs = rt_fdt_next_cell(&cell, addr_cells);
+            *out_regs = rt_ofw_translate_address(np, RT_NULL, *out_regs);
+            ++out_regs;
+
+            *out_regs = rt_fdt_next_cell(&cell, size_cells);
+            ++out_regs;
+        }
+    }
+    else
+    {
+        count = -RT_EINVAL;
+    }
+
+    return count;
+}
+
+static struct bus_ranges *ofw_bus_ranges(struct rt_ofw_node *np, struct rt_ofw_prop *prop)
+{
+    const fdt32_t *cell;
+    struct bus_ranges *ranges = RT_NULL;
+    int child_address_cells, child_size_cells, parent_address_cells, groups;
+    rt_uint64_t *child_addr, *parent_addr, *child_size;
+
+    /*
+     * Address Translation Example:
+     *
+     *  / {
+     *      #address-cells = <1>;
+     *      #size-cells = <1>;
+     *
+     *      soc {
+     *          compatible = "simple-bus";
+     *          #address-cells = <1>;
+     *          #size-cells = <1>;
+     *          ranges = <0x0 0xe0000000 0x00100000>;
+     *
+     *          serial@4600 {
+     *              device_type = "serial";
+     *              reg = <0x4600 0x100>;
+     *              clock-frequency = <0>;
+     *          };
+     *      };
+     *  }
+     *
+     * The soc node specifies a ranges property of <0x0 0xe0000000 0x00100000>;
+     * This property value specifies that for a 1024 KB range of address space, a
+     * child node addressed at physical 0x0 maps to a parent address of physical
+     * 0xe0000000. With this mapping, the serial device node can be addressed by a
+     * load or store at address 0xe0004600, an offset of 0x4600 (specified in reg)
+     * plus the 0xe0000000 mapping specified in ranges:
+     *
+     *      bus-address = parent-bus-address + (reg-address - child-bus-address)
+     */
+
+    do {
+        child_address_cells = rt_ofw_bus_addr_cells(np);
+        child_size_cells = rt_ofw_bus_size_cells(np);
+        parent_address_cells = rt_ofw_io_addr_cells(np);
+
+        if (child_address_cells < 0 || child_size_cells < 0 || parent_address_cells < 0)
+        {
+            LOG_D("%s read address/size cells fail: child[%d, %d] parent[%d]",
+                    np->full_name, child_address_cells, child_size_cells, parent_address_cells);
+
+            break;
+        }
+
+        groups = prop->length / sizeof(*cell);
+        groups /= child_address_cells + child_size_cells + parent_address_cells;
+
+        ranges = rt_malloc(sizeof(*ranges) + sizeof(rt_uint64_t) * 3 * groups);
+
+        if (!ranges)
+        {
+            break;
+        }
+
+        ranges->nr = groups;
+        ranges->child_addr = (void *)ranges + sizeof(*ranges);
+        ranges->parent_addr = &ranges->child_addr[groups];
+        ranges->child_size = &ranges->parent_addr[groups];
+
+        cell = prop->value;
+
+        child_addr = ranges->child_addr;
+        parent_addr = ranges->parent_addr;
+        child_size = ranges->child_size;
+
+        while (groups --> 0)
+        {
+            *child_addr++ = rt_fdt_next_cell(&cell, child_address_cells);
+            *parent_addr++ = rt_fdt_next_cell(&cell, parent_address_cells);
+            *child_size++ = rt_fdt_next_cell(&cell, child_size_cells);
+        }
+
+        rt_ofw_data(np) = ranges;
+    } while (0);
+
+    return ranges;
+}
+
+rt_uint64_t rt_ofw_translate_address(struct rt_ofw_node *np, const char *range_type, rt_uint64_t address)
+{
+    rt_uint64_t cpu_addr = address;
+
+    if (!range_type)
+    {
+        range_type = "ranges";
+    }
+
+    rt_ofw_foreach_parent_node(np)
+    {
+        rt_ssize_t len;
+        struct rt_ofw_prop *prop;
+        struct bus_ranges *ranges;
+
+        prop = rt_ofw_get_prop(np, range_type, &len);
+
+        if (!prop || !len)
+        {
+            continue;
+        }
+
+        ranges = rt_ofw_data(np);
+
+        if (!ranges)
+        {
+            ranges = ofw_bus_ranges(np, prop);
+        }
+
+        if (ranges)
+        {
+            for (int i = 0; i < ranges->nr; ++i)
+            {
+                rt_uint64_t child_addr = ranges->child_addr[i];
+                rt_uint64_t child_size = ranges->child_size[i];
+
+                if (address >= child_addr && address < child_addr + child_size)
+                {
+                    cpu_addr = address + (ranges->parent_addr[i] - child_addr);
+
+                    break;
+                }
+            }
+        }
+        else
+        {
+            cpu_addr = ~0ULL;
+        }
+
+        rt_ofw_node_put(np);
+
+        break;
+    }
+
+    return cpu_addr;
+}
+
+#ifdef ARCH_CPU_64BIT
+#define ofw_address_cpu_cast(np, address) (void *)(address)
+#else
+#define ofw_address_cpu_cast(np, address)                       \
+({                                                              \
+    if (((address) >> 32))                                      \
+    {                                                           \
+        LOG_W("%s find 64 bits address = %x%x",                 \
+                rt_ofw_node_full_name(np),                      \
+                ofw_static_cast(rt_ubase_t, (address) >> 32),   \
+                ofw_static_cast(rt_ubase_t, (address)));        \
+    }                                                           \
+    (void *)ofw_static_cast(rt_ubase_t, (address));             \
+})
+#endif
+
+void *rt_ofw_iomap(struct rt_ofw_node *np, int index)
+{
+    void *iomem = RT_NULL;
+
+    if (np)
+    {
+        rt_uint64_t regs[2];
+
+        if (!ofw_get_address(np, index, &regs[0], &regs[1]))
+        {
+            iomem = rt_ioremap(ofw_address_cpu_cast(np, regs[0]), (size_t)regs[1]);
+        }
+    }
+
+    return iomem;
+}
+
+void *rt_ofw_iomap_by_name(struct rt_ofw_node *np, const char *name)
+{
+    void *iomem = RT_NULL;
+
+    if (np)
+    {
+        rt_uint64_t regs[2];
+
+        if (!ofw_get_address_by_name(np, name, &regs[0], &regs[1]))
+        {
+            iomem = rt_ioremap(ofw_address_cpu_cast(np, regs[0]), (size_t)regs[1]);
+        }
+    }
+
+    return iomem;
+}

riscv/rtthread/components/drivers/ofw/irq.c

@@ -0,0 +1,670 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-08-25     GuEe-GUI     first version
+ */
+
+#include <rtthread.h>
+
+#include <drivers/pic.h>
+#include <drivers/ofw.h>
+#include <drivers/ofw_io.h>
+#include <drivers/ofw_irq.h>
+
+#define DBG_TAG "rtdm.ofw"
+#define DBG_LVL DBG_INFO
+#include <rtdbg.h>
+
+#include "ofw_internal.h"
+
+static int ofw_interrupt_cells(struct rt_ofw_node *np)
+{
+    int interrupt_cells = -RT_EEMPTY;
+
+    rt_ofw_prop_read_u32(np, "#interrupt-cells", (rt_uint32_t *)&interrupt_cells);
+
+    return interrupt_cells;
+}
+
+int rt_ofw_irq_cells(struct rt_ofw_node *np)
+{
+    return np ? ofw_interrupt_cells(np) : -RT_EINVAL;
+}
+
+static rt_err_t ofw_parse_irq_map(struct rt_ofw_node *np, struct rt_ofw_cell_args *irq_args)
+{
+    rt_err_t err = RT_EOK;
+    rt_phandle ic_phandle = 0;
+    rt_ssize_t map_len, map_mask_len;
+    struct rt_ofw_node *ic_np = RT_NULL;
+    const fdt32_t *addr, *map, *map_mask;
+    int child_address_cells, child_interrupt_cells;
+    int parent_address_cells, parent_interrupt_cells;
+    int addr_cells, pin_cells, icaddr_cells, idx1, idx2, limit;
+
+    /*
+     * interrupt-map:
+     *  An interrupt-map is a property on a nexus node that bridges one
+     *  interrupt domain with a set of parent interrupt domains and specifies
+     *  how interrupt specifiers in the child domain are mapped to
+     *  their respective parent domains.
+     *
+     *  The interrupt map is a table where each row is a mapping entry
+     *  consisting of five components: child unit address, child interrupt
+     *  specifier, interrupt-parent, parent unit address, parent interrupt
+     *  specifier.
+     *
+     *  child unit address
+     *      The unit address of the child node being mapped. The number of
+     *      32-bit cells required to specify this is described by the
+     *      #address-cells property of the bus node on which the child is
+     *      located.
+     *
+     *  child interrupt specifier
+     *      The interrupt specifier of the child node being mapped. The number
+     *      of 32-bit cells required to specify this component is described by
+     *      the #interrupt-cells property of this node-the nexus node containing
+     *      the interrupt-map property.
+     *
+     *  interrupt-parent
+     *      A single <phandle> value that points to the interrupt parent to
+     *      which the child domain is being mapped.
+     *
+     *  parent unit address
+     *      The unit address in the domain of the interrupt parent. The number
+     *      of 32-bit cells required to specify this address is described by the
+     *      #address-cells property of the node pointed to by the
+     *      interrupt-parent field.
+     *
+     *  parent interrupt specifier
+     *      The interrupt specifier in the parent domain. The number of 32-bit
+     *      cells required to specify this component is described by the
+     *      #interrupt-cells property of the node pointed to by the
+     *      interrupt-parent field.
+     *
+     *  Lookups are performed on the interrupt mapping table by matching a
+     *  unit-address/interrupt specifier pair against the child components in
+     *  the interrupt-map. Because some fields in the unit interrupt specifier
+     *  may not be relevant, a mask is applied before the lookup is done.
+     *  Example:
+     *
+     *      pic: interrupt-controller@0 {
+     *          interrupt-controller;
+     *          #address-cells = <0>;   // icaddr (parent unit address)
+     *          #interrupt-cells = <1>; // icintr (parent interrupt specifier)
+     *      };
+     *
+     *      gic: interrupt-controller@1 {
+     *          interrupt-controller;
+     *          #address-cells = <2>;   // icaddr (parent unit address)
+     *          #interrupt-cells = <3>; // icintr (parent interrupt specifier)
+     *      };
+     *
+     *      pcie {
+     *          #address-cells = <3>;   // addr (child unit address)
+     *          #interrupt-cells = <1>; // pin (child interrupt specifier)
+     *          interrupt-parent = <&gic>;
+     *          interrupt-map-mask = <0x1800 0 0 7>;
+     *          interrupt-map =
+     *              //     addr pin   ic icintr
+     *              <0x0000 0 0   1 &pic      1>, // INTA SOLT 0
+     *              <0x0000 0 0   2 &pic      2>, // INTB
+     *              <0x0000 0 0   3 &pic      3>, // INTC
+     *              <0x0000 0 0   4 &pic      4>, // INTD
+     *              <0x0800 0 0   1 &pic      2>, // INTA SOLT 1
+     *              <0x0800 0 0   2 &pic      3>, // INTB
+     *              <0x0800 0 0   3 &pic      4>, // INTC
+     *              <0x0800 0 0   4 &pic      1>, // INTD
+     *              //     addr pin   ic icaddr                        icintr
+     *              <0x1000 0 0   1 &gic    0 0 GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>, // INTA SOLT 2
+     *              <0x1000 0 0   2 &gic    0 0 GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>, // INTB
+     *              <0x1000 0 0   3 &gic    0 0 GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>, // INTC
+     *              <0x1000 0 0   4 &gic    0 0 GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>, // INTD
+     *              <0x1800 0 0   1 &gic    0 0 GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>, // INTA SOLT 3
+     *              <0x1800 0 0   2 &gic    0 0 GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>, // INTB
+     *              <0x1800 0 0   3 &gic    0 0 GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>, // INTC
+     *              <0x1800 0 0   4 &gic    0 0 GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>; // INTD
+     *      };
+     *
+     * In fact, almost no SoC will be use multi IC to implement INTx.
+     * before call ofw_parse_irq_map(np, &args):
+     *
+     *      args.data = addr;
+     *      args.args_count = 2 or 3;
+     *      args.args[0] = (addr cells);
+     *      args.args[1] = (pin cells);
+     *      args.args[2] = (icaddr cells);
+     *
+     * if call with `pcie` in ofw_parse_irq_map(np, &args):
+     *
+     *      np = &pcie;
+     *      args.data = addr = fdt32_t({ (bus << 16) | (device << 11) | (function << 8), 0, 0, pin });
+     *      args.args_count = 2;
+     *      args.args[0] = 3;
+     *      args.args[1] = 1;
+     *
+     * To perform a lookup of the gic interrupt source number for INTB for IDSEL
+     * 0x12 (slot 2), function 0x3, the following steps would be performed:
+     *
+     *  1.The user addr is value <0x9300 0 0 2>.
+     *
+     *  2.The encoding of the address includes the bus number (0x0 << 16),
+     *    device number (0x12 << 11), and function number (0x3 << 8).
+     *
+     *  3.The interrupt specifier is 2, which is the encoding for INTB as per
+     *    the PCI binding.
+     *
+     *  4.The interrupt-map-mask value <0x1800 0 0 7> is applied, giving a
+     *    result of <0x1000 0 0 2>.
+     *
+     *  5.That result is looked up in the interrupt-map table, which maps to the
+     *    parent interrupt specifier <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>.
+     */
+
+    do {
+        err = -RT_EEMPTY;
+
+        if ((child_address_cells = rt_ofw_bus_addr_cells(np)) < 0)
+        {
+            LOG_D("%s property %s is undefined", np->full_name, "#address-cells");
+
+            break;
+        }
+
+        if ((child_interrupt_cells = ofw_interrupt_cells(np)) < 0)
+        {
+            LOG_D("%s property %s is undefined", np->full_name, "#interrupt-cells");
+
+            break;
+        }
+
+        if (!(map = rt_ofw_prop_read_raw(np, "interrupt-map", &map_len)))
+        {
+            LOG_D("%s property %s is undefined", np->full_name, "interrupt-map");
+
+            break;
+        }
+
+        if (!(map_mask = rt_ofw_prop_read_raw(np, "interrupt-map-mask", &map_mask_len)))
+        {
+            LOG_D("%s property %s is undefined", np->full_name, "interrupt-map-mask");
+
+            break;
+        }
+
+        map_len = sizeof(fdt32_t);
+        map_mask_len = sizeof(fdt32_t);
+
+        err = -RT_EINVAL;
+
+        addr = irq_args->data;
+        addr_cells = irq_args->args[0];
+        pin_cells = irq_args->args[1];
+        icaddr_cells = irq_args->args_count == 3 ? irq_args->args[2] : 0;
+
+        if (addr_cells > child_address_cells)
+        {
+            LOG_D("%s(%d) > %s(%d)", "addr_cells", addr_cells, "child_address_cells", child_address_cells);
+
+            break;
+        }
+
+        if (pin_cells > child_interrupt_cells)
+        {
+            LOG_D("%s(%d) > %s(%d)", "pin_cells", pin_cells, "child_interrupt_cells", child_interrupt_cells);
+
+            break;
+        }
+
+        err = -RT_ENOENT;
+
+#define _map_walk_range(_idx, _idx2, _count, ...) \
+        for (idx1 = _idx, idx2 = _idx2, limit = idx1 + _count; idx1 < limit __VA_ARGS__; ++idx1, ++idx2)
+
+        _map_walk_range(0, 0, addr_cells)
+        {
+            /* Applied addr mask */
+            ((fdt32_t *)addr)[idx1] &= map_mask[idx2];
+        }
+
+        _map_walk_range(addr_cells, child_address_cells, pin_cells)
+        {
+            /* Applied pin mask */
+            ((fdt32_t *)addr)[idx1] &= map_mask[idx2];
+        }
+
+        while (map_len > 0)
+        {
+            rt_bool_t match = RT_TRUE;
+
+            _map_walk_range(0, 0, addr_cells)
+            {
+                /* Applied mask */
+                if (addr[idx1] != map[idx2])
+                {
+                    match = RT_FALSE;
+                    break;
+                }
+            }
+
+            _map_walk_range(addr_cells, child_address_cells, pin_cells, && match)
+            {
+                /* Applied mask */
+                if (addr[idx1] != map[idx2])
+                {
+                    match = RT_FALSE;
+                    break;
+                }
+            }
+
+            /* Skip addr, pin */
+            map += map_mask_len;
+
+            /* IC is different? */
+            if (ic_phandle != fdt32_to_cpu(*map))
+            {
+                rt_ofw_node_put(ic_np);
+
+                ic_phandle = fdt32_to_cpu(*map);
+                ic_np = rt_ofw_find_node_by_phandle(ic_phandle);
+
+                if (!ic_np)
+                {
+                    LOG_D("%s irq parent phandle = %d is not found", np->full_name, ic_phandle);
+
+                    break;
+                }
+
+                if ((parent_address_cells = rt_ofw_bus_addr_cells(ic_np)) < 0)
+                {
+                    LOG_D("%s property %s is undefined", ic_np->full_name, "#address-cells");
+
+                    break;
+                }
+
+                if (icaddr_cells > parent_address_cells)
+                {
+                    LOG_D("%s(%d) > %s(%d)", "icaddr_cells", icaddr_cells, "parent_address_cells", parent_address_cells);
+
+                    break;
+                }
+
+                if ((parent_interrupt_cells = ofw_interrupt_cells(ic_np)) < 0)
+                {
+                    LOG_D("%s property %s is undefined", ic_np->full_name, "#interrupt-cells");
+
+                    break;
+                }
+
+                RT_ASSERT(parent_interrupt_cells <= RT_OFW_MAX_CELL_ARGS);
+            }
+
+            /* Skip ic phandle */
+            ++map;
+
+            _map_walk_range(addr_cells + pin_cells, 0, icaddr_cells, && match)
+            {
+                /* Applied ic_addr mask */
+                if (addr[idx1] != map[idx2])
+                {
+                    match = RT_FALSE;
+                    break;
+                }
+            }
+
+            /* Skip icaddr */
+            map += parent_address_cells;
+
+            if (match)
+            {
+                irq_args->data = ic_np;
+                irq_args->args_count = parent_interrupt_cells;
+
+                for (int i = 0; i < irq_args->args_count; ++i)
+                {
+                    irq_args->args[i] = fdt32_to_cpu(*map++);
+                }
+
+                err = RT_EOK;
+
+                break;
+            }
+
+            /* Skip icintr */
+            map += parent_interrupt_cells;
+
+            map_len -= map_mask_len + 1 + parent_address_cells + parent_interrupt_cells;
+        }
+
+#undef _map_walk_range
+    } while (0);
+
+    return err;
+}
+
+rt_err_t rt_ofw_parse_irq_map(struct rt_ofw_node *np, struct rt_ofw_cell_args *irq_args)
+{
+    rt_err_t err;
+
+    if (np && irq_args && irq_args->data)
+    {
+        err = ofw_parse_irq_map(np, irq_args);
+    }
+    else
+    {
+        err = -RT_EINVAL;
+    }
+
+    return err;
+}
+
+static rt_err_t ofw_parse_irq_cells(struct rt_ofw_node *np, int index, struct rt_ofw_cell_args *out_irq_args)
+{
+    rt_err_t err;
+
+    /*
+     * interrupts-extended:
+     *
+     *  The interrupts-extended property lists the interrupt(s) generated by a
+     *  device. interrupts-extended should be used instead of interrupts when a
+     *  device is connected to multiple interrupt controllers as it encodes a
+     *  parent phandle with each interrupt specifier. Example:
+     *
+     *      pic: interrupt-controller@0 {
+     *          interrupt-controller;
+     *          #interrupt-cells = <1>;
+     *      };
+     *
+     *      gic: interrupt-controller@1 {
+     *          interrupt-controller;
+     *          #interrupt-cells = <3>;
+     *      };
+     *
+     *      node: node {
+     *          interrupts-extended = <&pic 9>, <&gic GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+     *      };
+     *
+     *  call `rt_ofw_parse_phandle_cells` to get irq info;
+     */
+
+    err = rt_ofw_parse_phandle_cells(np, "interrupts-extended", "#interrupt-cells", index, out_irq_args);
+
+    do {
+        int interrupt_cells;
+        const fdt32_t *cell;
+        rt_ssize_t interrupt_len;
+        struct rt_ofw_node *ic_np;
+
+        if (!err)
+        {
+            break;
+        }
+
+        /*
+         * interrupts (old style):
+         *
+         *  The interrupts property of a device node defines the interrupt or
+         *  interrupts that are generated by the device. The value of the
+         *  interrupts property consists of an arbitrary number of interrupt
+         *  specifiers. The format of an interrupt specifier is defined by the
+         *  binding of the interrupt domain root.
+         *  interrupts is overridden by the interrupts-extended property and
+         *  normally only one or the other should be used. Example:
+         *
+         *      pic: interrupt-controller@0 {
+         *          interrupt-controller;
+         *          #interrupt-cells = <1>;
+         *      };
+         *
+         *      gic: interrupt-controller@1 {
+         *          interrupt-controller;
+         *          #interrupt-cells = <3>;
+         *      };
+         *
+         *      node0: node0 {
+         *          interrupt-parent = <&pic>;
+         *          interrupts = <9>;
+         *      };
+         *
+         *      node1: node1 {
+         *          interrupt-parent = <&gic>;
+         *          interrupts = <GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>;
+         *      };
+         */
+
+        cell = rt_ofw_prop_read_raw(np, "interrupts", &interrupt_len);
+
+        if (!cell)
+        {
+            err = -RT_ERROR;
+            break;
+        }
+
+        ic_np = rt_ofw_find_irq_parent(np, &interrupt_cells);
+
+        if (!ic_np)
+        {
+            err = -RT_ERROR;
+            break;
+        }
+
+        RT_ASSERT(interrupt_cells <= RT_OFW_MAX_CELL_ARGS);
+
+        if (index >= interrupt_len / (interrupt_cells * sizeof(*cell)))
+        {
+            err = -RT_EINVAL;
+            break;
+        }
+
+        cell += index * interrupt_cells;
+
+        out_irq_args->data = ic_np;
+        out_irq_args->args_count = interrupt_cells;
+
+        for (int idx = 0; idx < interrupt_cells; ++idx, ++cell)
+        {
+            out_irq_args->args[idx] = fdt32_to_cpu(*cell);
+        }
+
+        err = RT_EOK;
+    } while (0);
+
+    return err;
+}
+
+rt_err_t rt_ofw_parse_irq_cells(struct rt_ofw_node *np, int index, struct rt_ofw_cell_args *out_irq_args)
+{
+    rt_err_t err;
+
+    if (np && index >= 0 && out_irq_args)
+    {
+        err = ofw_parse_irq_cells(np, index, out_irq_args);
+    }
+    else
+    {
+        err = -RT_EINVAL;
+    }
+
+    return err;
+}
+
+struct rt_ofw_node *rt_ofw_find_irq_parent(struct rt_ofw_node *np, int *out_interrupt_cells)
+{
+    for (np = rt_ofw_node_get(np); np; np = rt_ofw_get_next_parent(np))
+    {
+        rt_phandle ic_phandle;
+
+        if (!rt_ofw_prop_read_u32(np, "interrupt-parent", (rt_uint32_t *)&ic_phandle))
+        {
+            int interrupt_cells;
+            struct rt_ofw_node *ic_np = rt_ofw_find_node_by_phandle(ic_phandle);
+
+            if (ic_np && (interrupt_cells = ofw_interrupt_cells(ic_np)) >= 0)
+            {
+                np = ic_np;
+
+                if (out_interrupt_cells)
+                {
+                    *out_interrupt_cells = interrupt_cells;
+                }
+
+                break;
+            }
+
+            rt_ofw_node_put(ic_np);
+        }
+    }
+
+    return np;
+}
+
+static int ofw_map_irq(struct rt_ofw_cell_args *irq_args)
+{
+    int irq;
+    struct rt_ofw_node *ic_np = irq_args->data;
+    struct rt_pic *pic = rt_pic_dynamic_cast(rt_ofw_data(ic_np));
+
+    /* args.data is "interrupt-controller" */
+    if (pic)
+    {
+        struct rt_pic_irq pirq;
+
+        if (!pic->ops->irq_parse)
+        {
+            LOG_E("Master pic MUST implemented irq_parse");
+            RT_ASSERT(0);
+        }
+
+        if (!pic->ops->irq_map)
+        {
+            LOG_E("Master pic MUST implemented irq_map");
+            RT_ASSERT(0);
+        }
+
+        irq = pic->ops->irq_parse(pic, irq_args, &pirq);
+
+        if (!irq)
+        {
+            irq = pic->ops->irq_map(pic, pirq.hwirq, pirq.mode);
+        }
+    }
+    else
+    {
+        LOG_E("Master pic %s not support", ic_np->full_name);
+        irq = -RT_EIO;
+    }
+
+    rt_ofw_node_put(ic_np);
+
+    return irq;
+}
+
+int rt_ofw_map_irq(struct rt_ofw_cell_args *irq_args)
+{
+    int irq;
+
+    if (irq_args && irq_args->data && irq_args->args_count > 0)
+    {
+        irq = ofw_map_irq(irq_args);
+    }
+    else
+    {
+        irq = -RT_EINVAL;
+    }
+
+    return irq;
+}
+
+int rt_ofw_get_irq_count(struct rt_ofw_node *np)
+{
+    int count;
+
+    if (np)
+    {
+        struct rt_ofw_cell_args irq_args;
+
+        count = 0;
+
+        while (!ofw_parse_irq_cells(np, count, &irq_args))
+        {
+            ++count;
+        }
+    }
+    else
+    {
+        count = -RT_EINVAL;
+    }
+
+    return count;
+}
+
+int rt_ofw_get_irq(struct rt_ofw_node *np, int index)
+{
+    int irq;
+
+    if (np && index >= 0)
+    {
+        struct rt_ofw_cell_args irq_args;
+
+        irq = ofw_parse_irq_cells(np, index, &irq_args);
+
+        if (irq >= 0)
+        {
+            rt_phandle cpu_phandle;
+
+            irq = ofw_map_irq(&irq_args);
+
+            if (irq >= 0 && !rt_ofw_prop_read_u32_index(np, "interrupt-affinity", index, &cpu_phandle))
+            {
+                rt_uint64_t cpuid = rt_ofw_get_cpu_id(rt_ofw_find_node_by_phandle(cpu_phandle));
+
+                if ((rt_int64_t)cpuid >= 0)
+                {
+                    RT_BITMAP_DECLARE(affinity, RT_CPUS_NR) = { 0 };
+
+                    rt_bitmap_set_bit(affinity, cpuid);
+
+                    if (rt_pic_irq_set_affinity(irq, affinity) == -RT_ENOSYS)
+                    {
+                        LOG_W("%s irq affinity init fail", np->full_name);
+                    }
+                }
+            }
+        }
+    }
+    else
+    {
+        irq = -RT_EINVAL;
+    }
+
+    return irq;
+}
+
+int rt_ofw_get_irq_by_name(struct rt_ofw_node *np, const char *name)
+{
+    int irq;
+
+    if (np && name)
+    {
+        int index = rt_ofw_prop_index_of_string(np, "interrupt-names", name);
+
+        if (index >= 0)
+        {
+            irq = rt_ofw_get_irq(np, index);
+        }
+        else
+        {
+            irq = -1;
+        }
+    }
+    else
+    {
+        irq = -RT_EINVAL;
+    }
+
+    return irq;
+}

riscv/rtthread/components/drivers/ofw/libfdt/SConscript

@@ -0,0 +1,10 @@
+from building import *
+
+cwd     = GetCurrentDir()
+src     = Glob('*.c')
+
+CPPPATH = [cwd]
+
+group = DefineGroup('DeviceDrivers', src, depend = [''], CPPPATH = CPPPATH)
+
+Return('group')

riscv/rtthread/components/drivers/ofw/libfdt/fdt.c

@@ -0,0 +1,339 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+/*
+ * Minimal sanity check for a read-only tree. fdt_ro_probe_() checks
+ * that the given buffer contains what appears to be a flattened
+ * device tree with sane information in its header.
+ */
+int32_t fdt_ro_probe_(const void *fdt)
+{
+    uint32_t totalsize = fdt_totalsize(fdt);
+
+    if (can_assume(VALID_DTB))
+        return totalsize;
+
+    /* The device tree must be at an 8-byte aligned address */
+    if ((uintptr_t)fdt & 7)
+        return -FDT_ERR_ALIGNMENT;
+
+    if (fdt_magic(fdt) == FDT_MAGIC) {
+        /* Complete tree */
+        if (!can_assume(LATEST)) {
+            if (fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
+                return -FDT_ERR_BADVERSION;
+            if (fdt_last_comp_version(fdt) >
+                    FDT_LAST_SUPPORTED_VERSION)
+                return -FDT_ERR_BADVERSION;
+        }
+    } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
+        /* Unfinished sequential-write blob */
+        if (!can_assume(VALID_INPUT) && fdt_size_dt_struct(fdt) == 0)
+            return -FDT_ERR_BADSTATE;
+    } else {
+        return -FDT_ERR_BADMAGIC;
+    }
+
+    if (totalsize < INT32_MAX)
+        return totalsize;
+    else
+        return -FDT_ERR_TRUNCATED;
+}
+
+static int check_off_(uint32_t hdrsize, uint32_t totalsize, uint32_t off)
+{
+    return (off >= hdrsize) && (off <= totalsize);
+}
+
+static int check_block_(uint32_t hdrsize, uint32_t totalsize,
+            uint32_t base, uint32_t size)
+{
+    if (!check_off_(hdrsize, totalsize, base))
+        return 0; /* block start out of bounds */
+    if ((base + size) < base)
+        return 0; /* overflow */
+    if (!check_off_(hdrsize, totalsize, base + size))
+        return 0; /* block end out of bounds */
+    return 1;
+}
+
+size_t fdt_header_size_(uint32_t version)
+{
+    if (version <= 1)
+        return FDT_V1_SIZE;
+    else if (version <= 2)
+        return FDT_V2_SIZE;
+    else if (version <= 3)
+        return FDT_V3_SIZE;
+    else if (version <= 16)
+        return FDT_V16_SIZE;
+    else
+        return FDT_V17_SIZE;
+}
+
+size_t fdt_header_size(const void *fdt)
+{
+    return can_assume(LATEST) ? FDT_V17_SIZE :
+        fdt_header_size_(fdt_version(fdt));
+}
+
+int fdt_check_header(const void *fdt)
+{
+    size_t hdrsize;
+
+    /* The device tree must be at an 8-byte aligned address */
+    if ((uintptr_t)fdt & 7)
+        return -FDT_ERR_ALIGNMENT;
+
+    if (fdt_magic(fdt) != FDT_MAGIC)
+        return -FDT_ERR_BADMAGIC;
+    if (!can_assume(LATEST)) {
+        if ((fdt_version(fdt) < FDT_FIRST_SUPPORTED_VERSION)
+            || (fdt_last_comp_version(fdt) >
+            FDT_LAST_SUPPORTED_VERSION))
+            return -FDT_ERR_BADVERSION;
+        if (fdt_version(fdt) < fdt_last_comp_version(fdt))
+            return -FDT_ERR_BADVERSION;
+    }
+    hdrsize = fdt_header_size(fdt);
+    if (!can_assume(VALID_DTB)) {
+        if ((fdt_totalsize(fdt) < hdrsize)
+            || (fdt_totalsize(fdt) > INT_MAX))
+            return -FDT_ERR_TRUNCATED;
+
+        /* Bounds check memrsv block */
+        if (!check_off_(hdrsize, fdt_totalsize(fdt),
+                fdt_off_mem_rsvmap(fdt)))
+            return -FDT_ERR_TRUNCATED;
+
+        /* Bounds check structure block */
+        if (!can_assume(LATEST) && fdt_version(fdt) < 17) {
+            if (!check_off_(hdrsize, fdt_totalsize(fdt),
+                    fdt_off_dt_struct(fdt)))
+                return -FDT_ERR_TRUNCATED;
+        } else {
+            if (!check_block_(hdrsize, fdt_totalsize(fdt),
+                      fdt_off_dt_struct(fdt),
+                      fdt_size_dt_struct(fdt)))
+                return -FDT_ERR_TRUNCATED;
+        }
+
+        /* Bounds check strings block */
+        if (!check_block_(hdrsize, fdt_totalsize(fdt),
+                  fdt_off_dt_strings(fdt),
+                  fdt_size_dt_strings(fdt)))
+            return -FDT_ERR_TRUNCATED;
+    }
+
+    return 0;
+}
+
+const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
+{
+    unsigned int uoffset = offset;
+    unsigned int absoffset = offset + fdt_off_dt_struct(fdt);
+
+    if (offset < 0)
+        return NULL;
+
+    if (!can_assume(VALID_INPUT))
+        if ((absoffset < uoffset)
+            || ((absoffset + len) < absoffset)
+            || (absoffset + len) > fdt_totalsize(fdt))
+            return NULL;
+
+    if (can_assume(LATEST) || fdt_version(fdt) >= 0x11)
+        if (((uoffset + len) < uoffset)
+            || ((offset + len) > fdt_size_dt_struct(fdt)))
+            return NULL;
+
+    return fdt_offset_ptr_(fdt, offset);
+}
+
+uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
+{
+    const fdt32_t *tagp, *lenp;
+    uint32_t tag, len, sum;
+    int offset = startoffset;
+    const char *p;
+
+    *nextoffset = -FDT_ERR_TRUNCATED;
+    tagp = fdt_offset_ptr(fdt, offset, FDT_TAGSIZE);
+    if (!can_assume(VALID_DTB) && !tagp)
+        return FDT_END; /* premature end */
+    tag = fdt32_to_cpu(*tagp);
+    offset += FDT_TAGSIZE;
+
+    *nextoffset = -FDT_ERR_BADSTRUCTURE;
+    switch (tag) {
+    case FDT_BEGIN_NODE:
+        /* skip name */
+        do {
+            p = fdt_offset_ptr(fdt, offset++, 1);
+        } while (p && (*p != '\0'));
+        if (!can_assume(VALID_DTB) && !p)
+            return FDT_END; /* premature end */
+        break;
+
+    case FDT_PROP:
+        lenp = fdt_offset_ptr(fdt, offset, sizeof(*lenp));
+        if (!can_assume(VALID_DTB) && !lenp)
+            return FDT_END; /* premature end */
+
+        len = fdt32_to_cpu(*lenp);
+        sum = len + offset;
+        if (!can_assume(VALID_DTB) &&
+            (INT_MAX <= sum || sum < (uint32_t) offset))
+            return FDT_END; /* premature end */
+
+        /* skip-name offset, length and value */
+        offset += sizeof(struct fdt_property) - FDT_TAGSIZE + len;
+
+        if (!can_assume(LATEST) &&
+            fdt_version(fdt) < 0x10 && len >= 8 &&
+            ((offset - len) % 8) != 0)
+            offset += 4;
+        break;
+
+    case FDT_END:
+    case FDT_END_NODE:
+    case FDT_NOP:
+        break;
+
+    default:
+        return FDT_END;
+    }
+
+    if (!fdt_offset_ptr(fdt, startoffset, offset - startoffset))
+        return FDT_END; /* premature end */
+
+    *nextoffset = FDT_TAGALIGN(offset);
+    return tag;
+}
+
+int fdt_check_node_offset_(const void *fdt, int offset)
+{
+    if (!can_assume(VALID_INPUT)
+        && ((offset < 0) || (offset % FDT_TAGSIZE)))
+        return -FDT_ERR_BADOFFSET;
+
+    if (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE)
+        return -FDT_ERR_BADOFFSET;
+
+    return offset;
+}
+
+int fdt_check_prop_offset_(const void *fdt, int offset)
+{
+    if (!can_assume(VALID_INPUT)
+        && ((offset < 0) || (offset % FDT_TAGSIZE)))
+        return -FDT_ERR_BADOFFSET;
+
+    if (fdt_next_tag(fdt, offset, &offset) != FDT_PROP)
+        return -FDT_ERR_BADOFFSET;
+
+    return offset;
+}
+
+int fdt_next_node(const void *fdt, int offset, int *depth)
+{
+    int nextoffset = 0;
+    uint32_t tag;
+
+    if (offset >= 0)
+        if ((nextoffset = fdt_check_node_offset_(fdt, offset)) < 0)
+            return nextoffset;
+
+    do {
+        offset = nextoffset;
+        tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+        switch (tag) {
+        case FDT_PROP:
+        case FDT_NOP:
+            break;
+
+        case FDT_BEGIN_NODE:
+            if (depth)
+                (*depth)++;
+            break;
+
+        case FDT_END_NODE:
+            if (depth && ((--(*depth)) < 0))
+                return nextoffset;
+            break;
+
+        case FDT_END:
+            if ((nextoffset >= 0)
+                || ((nextoffset == -FDT_ERR_TRUNCATED) && !depth))
+                return -FDT_ERR_NOTFOUND;
+            else
+                return nextoffset;
+        }
+    } while (tag != FDT_BEGIN_NODE);
+
+    return offset;
+}
+
+int fdt_first_subnode(const void *fdt, int offset)
+{
+    int depth = 0;
+
+    offset = fdt_next_node(fdt, offset, &depth);
+    if (offset < 0 || depth != 1)
+        return -FDT_ERR_NOTFOUND;
+
+    return offset;
+}
+
+int fdt_next_subnode(const void *fdt, int offset)
+{
+    int depth = 1;
+
+    /*
+     * With respect to the parent, the depth of the next subnode will be
+     * the same as the last.
+     */
+    do {
+        offset = fdt_next_node(fdt, offset, &depth);
+        if (offset < 0 || depth < 1)
+            return -FDT_ERR_NOTFOUND;
+    } while (depth > 1);
+
+    return offset;
+}
+
+const char *fdt_find_string_(const char *strtab, int tabsize, const char *s)
+{
+    int len = strlen(s) + 1;
+    const char *last = strtab + tabsize - len;
+    const char *p;
+
+    for (p = strtab; p <= last; p++)
+        if (memcmp(p, s, len) == 0)
+            return p;
+    return NULL;
+}
+
+int fdt_move(const void *fdt, void *buf, int bufsize)
+{
+    if (!can_assume(VALID_INPUT) && bufsize < 0)
+        return -FDT_ERR_NOSPACE;
+
+    FDT_RO_PROBE(fdt);
+
+    if (fdt_totalsize(fdt) > (unsigned int)bufsize)
+        return -FDT_ERR_NOSPACE;
+
+    memmove(buf, fdt, fdt_totalsize(fdt));
+    return 0;
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt.h

@@ -0,0 +1,66 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
+#ifndef FDT_H
+#define FDT_H
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ * Copyright 2012 Kim Phillips, Freescale Semiconductor.
+ */
+
+#ifndef __ASSEMBLY__
+
+struct fdt_header {
+    fdt32_t magic;           /* magic word FDT_MAGIC */
+    fdt32_t totalsize;       /* total size of DT block */
+    fdt32_t off_dt_struct;       /* offset to structure */
+    fdt32_t off_dt_strings;      /* offset to strings */
+    fdt32_t off_mem_rsvmap;      /* offset to memory reserve map */
+    fdt32_t version;         /* format version */
+    fdt32_t last_comp_version;   /* last compatible version */
+
+    /* version 2 fields below */
+    fdt32_t boot_cpuid_phys;     /* Which physical CPU id we're
+                        booting on */
+    /* version 3 fields below */
+    fdt32_t size_dt_strings;     /* size of the strings block */
+
+    /* version 17 fields below */
+    fdt32_t size_dt_struct;      /* size of the structure block */
+};
+
+struct fdt_reserve_entry {
+    fdt64_t address;
+    fdt64_t size;
+};
+
+struct fdt_node_header {
+    fdt32_t tag;
+    char name[];
+};
+
+struct fdt_property {
+    fdt32_t tag;
+    fdt32_t len;
+    fdt32_t nameoff;
+    char data[];
+};
+
+#endif /* !__ASSEMBLY */
+
+#define FDT_MAGIC   0xd00dfeed  /* 4: version, 4: total size */
+#define FDT_TAGSIZE sizeof(fdt32_t)
+
+#define FDT_BEGIN_NODE  0x1     /* Start node: full name */
+#define FDT_END_NODE    0x2     /* End node */
+#define FDT_PROP    0x3     /* Property: name off,
+                       size, content */
+#define FDT_NOP     0x4     /* nop */
+#define FDT_END     0x9
+
+#define FDT_V1_SIZE (7*sizeof(fdt32_t))
+#define FDT_V2_SIZE (FDT_V1_SIZE + sizeof(fdt32_t))
+#define FDT_V3_SIZE (FDT_V2_SIZE + sizeof(fdt32_t))
+#define FDT_V16_SIZE    FDT_V3_SIZE
+#define FDT_V17_SIZE    (FDT_V16_SIZE + sizeof(fdt32_t))
+
+#endif /* FDT_H */

riscv/rtthread/components/drivers/ofw/libfdt/fdt_addresses.c

@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
+ * Copyright (C) 2018 embedded brains GmbH
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
+{
+    const fdt32_t *c;
+    uint32_t val;
+    int len;
+
+    c = fdt_getprop(fdt, nodeoffset, name, &len);
+    if (!c)
+        return len;
+
+    if (len != sizeof(*c))
+        return -FDT_ERR_BADNCELLS;
+
+    val = fdt32_to_cpu(*c);
+    if (val > FDT_MAX_NCELLS)
+        return -FDT_ERR_BADNCELLS;
+
+    return (int)val;
+}
+
+int fdt_address_cells(const void *fdt, int nodeoffset)
+{
+    int val;
+
+    val = fdt_cells(fdt, nodeoffset, "#address-cells");
+    if (val == 0)
+        return -FDT_ERR_BADNCELLS;
+    if (val == -FDT_ERR_NOTFOUND)
+        return 2;
+    return val;
+}
+
+int fdt_size_cells(const void *fdt, int nodeoffset)
+{
+    int val;
+
+    val = fdt_cells(fdt, nodeoffset, "#size-cells");
+    if (val == -FDT_ERR_NOTFOUND)
+        return 1;
+    return val;
+}
+
+/* This function assumes that [address|size]_cells is 1 or 2 */
+int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
+                 const char *name, uint64_t addr, uint64_t size)
+{
+    int addr_cells, size_cells, ret;
+    uint8_t data[sizeof(fdt64_t) * 2], *prop;
+
+    ret = fdt_address_cells(fdt, parent);
+    if (ret < 0)
+        return ret;
+    addr_cells = ret;
+
+    ret = fdt_size_cells(fdt, parent);
+    if (ret < 0)
+        return ret;
+    size_cells = ret;
+
+    /* check validity of address */
+    prop = data;
+    if (addr_cells == 1) {
+        if ((addr > UINT32_MAX) || (((uint64_t) UINT32_MAX + 1 - addr) < size))
+            return -FDT_ERR_BADVALUE;
+
+        fdt32_st(prop, (uint32_t)addr);
+    } else if (addr_cells == 2) {
+        fdt64_st(prop, addr);
+    } else {
+        return -FDT_ERR_BADNCELLS;
+    }
+
+    /* check validity of size */
+    prop += addr_cells * sizeof(fdt32_t);
+    if (size_cells == 1) {
+        if (size > UINT32_MAX)
+            return -FDT_ERR_BADVALUE;
+
+        fdt32_st(prop, (uint32_t)size);
+    } else if (size_cells == 2) {
+        fdt64_st(prop, size);
+    } else {
+        return -FDT_ERR_BADNCELLS;
+    }
+
+    return fdt_appendprop(fdt, nodeoffset, name, data,
+                  (addr_cells + size_cells) * sizeof(fdt32_t));
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_empty_tree.c

@@ -0,0 +1,38 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2012 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+int fdt_create_empty_tree(void *buf, int bufsize)
+{
+    int err;
+
+    err = fdt_create(buf, bufsize);
+    if (err)
+        return err;
+
+    err = fdt_finish_reservemap(buf);
+    if (err)
+        return err;
+
+    err = fdt_begin_node(buf, "");
+    if (err)
+        return err;
+
+    err =  fdt_end_node(buf);
+    if (err)
+        return err;
+
+    err = fdt_finish(buf);
+    if (err)
+        return err;
+
+    return fdt_open_into(buf, buf, bufsize);
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_overlay.c

@@ -0,0 +1,867 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2016 Free Electrons
+ * Copyright (C) 2016 NextThing Co.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+/**
+ * overlay_get_target_phandle - retrieves the target phandle of a fragment
+ * @fdto: pointer to the device tree overlay blob
+ * @fragment: node offset of the fragment in the overlay
+ *
+ * overlay_get_target_phandle() retrieves the target phandle of an
+ * overlay fragment when that fragment uses a phandle (target
+ * property) instead of a path (target-path property).
+ *
+ * returns:
+ *      the phandle pointed by the target property
+ *      0, if the phandle was not found
+ *  -1, if the phandle was malformed
+ */
+static uint32_t overlay_get_target_phandle(const void *fdto, int fragment)
+{
+    const fdt32_t *val;
+    int len;
+
+    val = fdt_getprop(fdto, fragment, "target", &len);
+    if (!val)
+        return 0;
+
+    if ((len != sizeof(*val)) || (fdt32_to_cpu(*val) == (uint32_t)-1))
+        return (uint32_t)-1;
+
+    return fdt32_to_cpu(*val);
+}
+
+int fdt_overlay_target_offset(const void *fdt, const void *fdto,
+                  int fragment_offset, char const **pathp)
+{
+    uint32_t phandle;
+    const char *path = NULL;
+    int path_len = 0, ret;
+
+    /* Try first to do a phandle based lookup */
+    phandle = overlay_get_target_phandle(fdto, fragment_offset);
+    if (phandle == (uint32_t)-1)
+        return -FDT_ERR_BADPHANDLE;
+
+    /* no phandle, try path */
+    if (!phandle) {
+        /* And then a path based lookup */
+        path = fdt_getprop(fdto, fragment_offset, "target-path", &path_len);
+        if (path)
+            ret = fdt_path_offset(fdt, path);
+        else
+            ret = path_len;
+    } else
+        ret = fdt_node_offset_by_phandle(fdt, phandle);
+
+    /*
+    * If we haven't found either a target or a
+    * target-path property in a node that contains a
+    * __overlay__ subnode (we wouldn't be called
+    * otherwise), consider it a improperly written
+    * overlay
+    */
+    if (ret < 0 && path_len == -FDT_ERR_NOTFOUND)
+        ret = -FDT_ERR_BADOVERLAY;
+
+    /* return on error */
+    if (ret < 0)
+        return ret;
+
+    /* return pointer to path (if available) */
+    if (pathp)
+        *pathp = path ? path : NULL;
+
+    return ret;
+}
+
+/**
+ * overlay_phandle_add_offset - Increases a phandle by an offset
+ * @fdt: Base device tree blob
+ * @node: Device tree overlay blob
+ * @name: Name of the property to modify (phandle or linux,phandle)
+ * @delta: offset to apply
+ *
+ * overlay_phandle_add_offset() increments a node phandle by a given
+ * offset.
+ *
+ * returns:
+ *      0 on success.
+ *      Negative error code on error
+ */
+static int overlay_phandle_add_offset(void *fdt, int node,
+                      const char *name, uint32_t delta)
+{
+    const fdt32_t *val;
+    uint32_t adj_val;
+    int len;
+
+    val = fdt_getprop(fdt, node, name, &len);
+    if (!val)
+        return len;
+
+    if (len != sizeof(*val))
+        return -FDT_ERR_BADPHANDLE;
+
+    adj_val = fdt32_to_cpu(*val);
+    if ((adj_val + delta) < adj_val)
+        return -FDT_ERR_NOPHANDLES;
+
+    adj_val += delta;
+    if (adj_val == (uint32_t)-1)
+        return -FDT_ERR_NOPHANDLES;
+
+    return fdt_setprop_inplace_u32(fdt, node, name, adj_val);
+}
+
+/**
+ * overlay_adjust_node_phandles - Offsets the phandles of a node
+ * @fdto: Device tree overlay blob
+ * @node: Offset of the node we want to adjust
+ * @delta: Offset to shift the phandles of
+ *
+ * overlay_adjust_node_phandles() adds a constant to all the phandles
+ * of a given node. This is mainly use as part of the overlay
+ * application process, when we want to update all the overlay
+ * phandles to not conflict with the overlays of the base device tree.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_adjust_node_phandles(void *fdto, int node,
+                    uint32_t delta)
+{
+    int child;
+    int ret;
+
+    ret = overlay_phandle_add_offset(fdto, node, "phandle", delta);
+    if (ret && ret != -FDT_ERR_NOTFOUND)
+        return ret;
+
+    ret = overlay_phandle_add_offset(fdto, node, "linux,phandle", delta);
+    if (ret && ret != -FDT_ERR_NOTFOUND)
+        return ret;
+
+    fdt_for_each_subnode(child, fdto, node) {
+        ret = overlay_adjust_node_phandles(fdto, child, delta);
+        if (ret)
+            return ret;
+    }
+
+    return 0;
+}
+
+/**
+ * overlay_adjust_local_phandles - Adjust the phandles of a whole overlay
+ * @fdto: Device tree overlay blob
+ * @delta: Offset to shift the phandles of
+ *
+ * overlay_adjust_local_phandles() adds a constant to all the
+ * phandles of an overlay. This is mainly use as part of the overlay
+ * application process, when we want to update all the overlay
+ * phandles to not conflict with the overlays of the base device tree.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_adjust_local_phandles(void *fdto, uint32_t delta)
+{
+    /*
+     * Start adjusting the phandles from the overlay root
+     */
+    return overlay_adjust_node_phandles(fdto, 0, delta);
+}
+
+/**
+ * overlay_update_local_node_references - Adjust the overlay references
+ * @fdto: Device tree overlay blob
+ * @tree_node: Node offset of the node to operate on
+ * @fixup_node: Node offset of the matching local fixups node
+ * @delta: Offset to shift the phandles of
+ *
+ * overlay_update_local_nodes_references() update the phandles
+ * pointing to a node within the device tree overlay by adding a
+ * constant delta.
+ *
+ * This is mainly used as part of a device tree application process,
+ * where you want the device tree overlays phandles to not conflict
+ * with the ones from the base device tree before merging them.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_update_local_node_references(void *fdto,
+                        int tree_node,
+                        int fixup_node,
+                        uint32_t delta)
+{
+    int fixup_prop;
+    int fixup_child;
+    int ret;
+
+    fdt_for_each_property_offset(fixup_prop, fdto, fixup_node) {
+        const fdt32_t *fixup_val;
+        const char *tree_val;
+        const char *name;
+        int fixup_len;
+        int tree_len;
+        int i;
+
+        fixup_val = fdt_getprop_by_offset(fdto, fixup_prop,
+                          &name, &fixup_len);
+        if (!fixup_val)
+            return fixup_len;
+
+        if (fixup_len % sizeof(uint32_t))
+            return -FDT_ERR_BADOVERLAY;
+        fixup_len /= sizeof(uint32_t);
+
+        tree_val = fdt_getprop(fdto, tree_node, name, &tree_len);
+        if (!tree_val) {
+            if (tree_len == -FDT_ERR_NOTFOUND)
+                return -FDT_ERR_BADOVERLAY;
+
+            return tree_len;
+        }
+
+        for (i = 0; i < fixup_len; i++) {
+            fdt32_t adj_val;
+            uint32_t poffset;
+
+            poffset = fdt32_to_cpu(fixup_val[i]);
+
+            /*
+             * phandles to fixup can be unaligned.
+             *
+             * Use a memcpy for the architectures that do
+             * not support unaligned accesses.
+             */
+            memcpy(&adj_val, tree_val + poffset, sizeof(adj_val));
+
+            adj_val = cpu_to_fdt32(fdt32_to_cpu(adj_val) + delta);
+
+            ret = fdt_setprop_inplace_namelen_partial(fdto,
+                                  tree_node,
+                                  name,
+                                  strlen(name),
+                                  poffset,
+                                  &adj_val,
+                                  sizeof(adj_val));
+            if (ret == -FDT_ERR_NOSPACE)
+                return -FDT_ERR_BADOVERLAY;
+
+            if (ret)
+                return ret;
+        }
+    }
+
+    fdt_for_each_subnode(fixup_child, fdto, fixup_node) {
+        const char *fixup_child_name = fdt_get_name(fdto, fixup_child,
+                                NULL);
+        int tree_child;
+
+        tree_child = fdt_subnode_offset(fdto, tree_node,
+                        fixup_child_name);
+        if (tree_child == -FDT_ERR_NOTFOUND)
+            return -FDT_ERR_BADOVERLAY;
+        if (tree_child < 0)
+            return tree_child;
+
+        ret = overlay_update_local_node_references(fdto,
+                               tree_child,
+                               fixup_child,
+                               delta);
+        if (ret)
+            return ret;
+    }
+
+    return 0;
+}
+
+/**
+ * overlay_update_local_references - Adjust the overlay references
+ * @fdto: Device tree overlay blob
+ * @delta: Offset to shift the phandles of
+ *
+ * overlay_update_local_references() update all the phandles pointing
+ * to a node within the device tree overlay by adding a constant
+ * delta to not conflict with the base overlay.
+ *
+ * This is mainly used as part of a device tree application process,
+ * where you want the device tree overlays phandles to not conflict
+ * with the ones from the base device tree before merging them.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_update_local_references(void *fdto, uint32_t delta)
+{
+    int fixups;
+
+    fixups = fdt_path_offset(fdto, "/__local_fixups__");
+    if (fixups < 0) {
+        /* There's no local phandles to adjust, bail out */
+        if (fixups == -FDT_ERR_NOTFOUND)
+            return 0;
+
+        return fixups;
+    }
+
+    /*
+     * Update our local references from the root of the tree
+     */
+    return overlay_update_local_node_references(fdto, 0, fixups,
+                            delta);
+}
+
+/**
+ * overlay_fixup_one_phandle - Set an overlay phandle to the base one
+ * @fdt: Base Device Tree blob
+ * @fdto: Device tree overlay blob
+ * @symbols_off: Node offset of the symbols node in the base device tree
+ * @path: Path to a node holding a phandle in the overlay
+ * @path_len: number of path characters to consider
+ * @name: Name of the property holding the phandle reference in the overlay
+ * @name_len: number of name characters to consider
+ * @poffset: Offset within the overlay property where the phandle is stored
+ * @label: Label of the node referenced by the phandle
+ *
+ * overlay_fixup_one_phandle() resolves an overlay phandle pointing to
+ * a node in the base device tree.
+ *
+ * This is part of the device tree overlay application process, when
+ * you want all the phandles in the overlay to point to the actual
+ * base dt nodes.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_fixup_one_phandle(void *fdt, void *fdto,
+                     int symbols_off,
+                     const char *path, uint32_t path_len,
+                     const char *name, uint32_t name_len,
+                     int poffset, const char *label)
+{
+    const char *symbol_path;
+    uint32_t phandle;
+    fdt32_t phandle_prop;
+    int symbol_off, fixup_off;
+    int prop_len;
+
+    if (symbols_off < 0)
+        return symbols_off;
+
+    symbol_path = fdt_getprop(fdt, symbols_off, label,
+                  &prop_len);
+    if (!symbol_path)
+        return prop_len;
+
+    symbol_off = fdt_path_offset(fdt, symbol_path);
+    if (symbol_off < 0)
+        return symbol_off;
+
+    phandle = fdt_get_phandle(fdt, symbol_off);
+    if (!phandle)
+        return -FDT_ERR_NOTFOUND;
+
+    fixup_off = fdt_path_offset_namelen(fdto, path, path_len);
+    if (fixup_off == -FDT_ERR_NOTFOUND)
+        return -FDT_ERR_BADOVERLAY;
+    if (fixup_off < 0)
+        return fixup_off;
+
+    phandle_prop = cpu_to_fdt32(phandle);
+    return fdt_setprop_inplace_namelen_partial(fdto, fixup_off,
+                           name, name_len, poffset,
+                           &phandle_prop,
+                           sizeof(phandle_prop));
+};
+
+/**
+ * overlay_fixup_phandle - Set an overlay phandle to the base one
+ * @fdt: Base Device Tree blob
+ * @fdto: Device tree overlay blob
+ * @symbols_off: Node offset of the symbols node in the base device tree
+ * @property: Property offset in the overlay holding the list of fixups
+ *
+ * overlay_fixup_phandle() resolves all the overlay phandles pointed
+ * to in a __fixups__ property, and updates them to match the phandles
+ * in use in the base device tree.
+ *
+ * This is part of the device tree overlay application process, when
+ * you want all the phandles in the overlay to point to the actual
+ * base dt nodes.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_fixup_phandle(void *fdt, void *fdto, int symbols_off,
+                 int property)
+{
+    const char *value;
+    const char *label;
+    int len;
+
+    value = fdt_getprop_by_offset(fdto, property,
+                      &label, &len);
+    if (!value) {
+        if (len == -FDT_ERR_NOTFOUND)
+            return -FDT_ERR_INTERNAL;
+
+        return len;
+    }
+
+    do {
+        const char *path, *name, *fixup_end;
+        const char *fixup_str = value;
+        uint32_t path_len, name_len;
+        uint32_t fixup_len;
+        char *sep, *endptr;
+        int poffset, ret;
+
+        fixup_end = memchr(value, '\0', len);
+        if (!fixup_end)
+            return -FDT_ERR_BADOVERLAY;
+        fixup_len = fixup_end - fixup_str;
+
+        len -= fixup_len + 1;
+        value += fixup_len + 1;
+
+        path = fixup_str;
+        sep = memchr(fixup_str, ':', fixup_len);
+        if (!sep || *sep != ':')
+            return -FDT_ERR_BADOVERLAY;
+
+        path_len = sep - path;
+        if (path_len == (fixup_len - 1))
+            return -FDT_ERR_BADOVERLAY;
+
+        fixup_len -= path_len + 1;
+        name = sep + 1;
+        sep = memchr(name, ':', fixup_len);
+        if (!sep || *sep != ':')
+            return -FDT_ERR_BADOVERLAY;
+
+        name_len = sep - name;
+        if (!name_len)
+            return -FDT_ERR_BADOVERLAY;
+
+        poffset = strtoul(sep + 1, &endptr, 10);
+        if ((*endptr != '\0') || (endptr <= (sep + 1)))
+            return -FDT_ERR_BADOVERLAY;
+
+        ret = overlay_fixup_one_phandle(fdt, fdto, symbols_off,
+                        path, path_len, name, name_len,
+                        poffset, label);
+        if (ret)
+            return ret;
+    } while (len > 0);
+
+    return 0;
+}
+
+/**
+ * overlay_fixup_phandles - Resolve the overlay phandles to the base
+ *                          device tree
+ * @fdt: Base Device Tree blob
+ * @fdto: Device tree overlay blob
+ *
+ * overlay_fixup_phandles() resolves all the overlay phandles pointing
+ * to nodes in the base device tree.
+ *
+ * This is one of the steps of the device tree overlay application
+ * process, when you want all the phandles in the overlay to point to
+ * the actual base dt nodes.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_fixup_phandles(void *fdt, void *fdto)
+{
+    int fixups_off, symbols_off;
+    int property;
+
+    /* We can have overlays without any fixups */
+    fixups_off = fdt_path_offset(fdto, "/__fixups__");
+    if (fixups_off == -FDT_ERR_NOTFOUND)
+        return 0; /* nothing to do */
+    if (fixups_off < 0)
+        return fixups_off;
+
+    /* And base DTs without symbols */
+    symbols_off = fdt_path_offset(fdt, "/__symbols__");
+    if ((symbols_off < 0 && (symbols_off != -FDT_ERR_NOTFOUND)))
+        return symbols_off;
+
+    fdt_for_each_property_offset(property, fdto, fixups_off) {
+        int ret;
+
+        ret = overlay_fixup_phandle(fdt, fdto, symbols_off, property);
+        if (ret)
+            return ret;
+    }
+
+    return 0;
+}
+
+/**
+ * overlay_apply_node - Merges a node into the base device tree
+ * @fdt: Base Device Tree blob
+ * @target: Node offset in the base device tree to apply the fragment to
+ * @fdto: Device tree overlay blob
+ * @node: Node offset in the overlay holding the changes to merge
+ *
+ * overlay_apply_node() merges a node into a target base device tree
+ * node pointed.
+ *
+ * This is part of the final step in the device tree overlay
+ * application process, when all the phandles have been adjusted and
+ * resolved and you just have to merge overlay into the base device
+ * tree.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_apply_node(void *fdt, int target,
+                  void *fdto, int node)
+{
+    int property;
+    int subnode;
+
+    fdt_for_each_property_offset(property, fdto, node) {
+        const char *name;
+        const void *prop;
+        int prop_len;
+        int ret;
+
+        prop = fdt_getprop_by_offset(fdto, property, &name,
+                         &prop_len);
+        if (prop_len == -FDT_ERR_NOTFOUND)
+            return -FDT_ERR_INTERNAL;
+        if (prop_len < 0)
+            return prop_len;
+
+        ret = fdt_setprop(fdt, target, name, prop, prop_len);
+        if (ret)
+            return ret;
+    }
+
+    fdt_for_each_subnode(subnode, fdto, node) {
+        const char *name = fdt_get_name(fdto, subnode, NULL);
+        int nnode;
+        int ret;
+
+        nnode = fdt_add_subnode(fdt, target, name);
+        if (nnode == -FDT_ERR_EXISTS) {
+            nnode = fdt_subnode_offset(fdt, target, name);
+            if (nnode == -FDT_ERR_NOTFOUND)
+                return -FDT_ERR_INTERNAL;
+        }
+
+        if (nnode < 0)
+            return nnode;
+
+        ret = overlay_apply_node(fdt, nnode, fdto, subnode);
+        if (ret)
+            return ret;
+    }
+
+    return 0;
+}
+
+/**
+ * overlay_merge - Merge an overlay into its base device tree
+ * @fdt: Base Device Tree blob
+ * @fdto: Device tree overlay blob
+ *
+ * overlay_merge() merges an overlay into its base device tree.
+ *
+ * This is the next to last step in the device tree overlay application
+ * process, when all the phandles have been adjusted and resolved and
+ * you just have to merge overlay into the base device tree.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_merge(void *fdt, void *fdto)
+{
+    int fragment;
+
+    fdt_for_each_subnode(fragment, fdto, 0) {
+        int overlay;
+        int target;
+        int ret;
+
+        /*
+         * Each fragments will have an __overlay__ node. If
+         * they don't, it's not supposed to be merged
+         */
+        overlay = fdt_subnode_offset(fdto, fragment, "__overlay__");
+        if (overlay == -FDT_ERR_NOTFOUND)
+            continue;
+
+        if (overlay < 0)
+            return overlay;
+
+        target = fdt_overlay_target_offset(fdt, fdto, fragment, NULL);
+        if (target < 0)
+            return target;
+
+        ret = overlay_apply_node(fdt, target, fdto, overlay);
+        if (ret)
+            return ret;
+    }
+
+    return 0;
+}
+
+static int get_path_len(const void *fdt, int nodeoffset)
+{
+    int len = 0, namelen;
+    const char *name;
+
+    FDT_RO_PROBE(fdt);
+
+    for (;;) {
+        name = fdt_get_name(fdt, nodeoffset, &namelen);
+        if (!name)
+            return namelen;
+
+        /* root? we're done */
+        if (namelen == 0)
+            break;
+
+        nodeoffset = fdt_parent_offset(fdt, nodeoffset);
+        if (nodeoffset < 0)
+            return nodeoffset;
+        len += namelen + 1;
+    }
+
+    /* in case of root pretend it's "/" */
+    if (len == 0)
+        len++;
+    return len;
+}
+
+/**
+ * overlay_symbol_update - Update the symbols of base tree after a merge
+ * @fdt: Base Device Tree blob
+ * @fdto: Device tree overlay blob
+ *
+ * overlay_symbol_update() updates the symbols of the base tree with the
+ * symbols of the applied overlay
+ *
+ * This is the last step in the device tree overlay application
+ * process, allowing the reference of overlay symbols by subsequent
+ * overlay operations.
+ *
+ * returns:
+ *      0 on success
+ *      Negative error code on failure
+ */
+static int overlay_symbol_update(void *fdt, void *fdto)
+{
+    int root_sym, ov_sym, prop, path_len, fragment, target;
+    int len, frag_name_len, ret, rel_path_len;
+    const char *s, *e;
+    const char *path;
+    const char *name;
+    const char *frag_name;
+    const char *rel_path;
+    const char *target_path;
+    char *buf;
+    void *p;
+
+    ov_sym = fdt_subnode_offset(fdto, 0, "__symbols__");
+
+    /* if no overlay symbols exist no problem */
+    if (ov_sym < 0)
+        return 0;
+
+    root_sym = fdt_subnode_offset(fdt, 0, "__symbols__");
+
+    /* it no root symbols exist we should create them */
+    if (root_sym == -FDT_ERR_NOTFOUND)
+        root_sym = fdt_add_subnode(fdt, 0, "__symbols__");
+
+    /* any error is fatal now */
+    if (root_sym < 0)
+        return root_sym;
+
+    /* iterate over each overlay symbol */
+    fdt_for_each_property_offset(prop, fdto, ov_sym) {
+        path = fdt_getprop_by_offset(fdto, prop, &name, &path_len);
+        if (!path)
+            return path_len;
+
+        /* verify it's a string property (terminated by a single \0) */
+        if (path_len < 1 || memchr(path, '\0', path_len) != &path[path_len - 1])
+            return -FDT_ERR_BADVALUE;
+
+        /* keep end marker to avoid strlen() */
+        e = path + path_len;
+
+        if (*path != '/')
+            return -FDT_ERR_BADVALUE;
+
+        /* get fragment name first */
+        s = strchr(path + 1, '/');
+        if (!s) {
+            /* Symbol refers to something that won't end
+             * up in the target tree */
+            continue;
+        }
+
+        frag_name = path + 1;
+        frag_name_len = s - path - 1;
+
+        /* verify format; safe since "s" lies in \0 terminated prop */
+        len = sizeof("/__overlay__/") - 1;
+        if ((e - s) > len && (memcmp(s, "/__overlay__/", len) == 0)) {
+            /* /<fragment-name>/__overlay__/<relative-subnode-path> */
+            rel_path = s + len;
+            rel_path_len = e - rel_path - 1;
+        } else if ((e - s) == len
+               && (memcmp(s, "/__overlay__", len - 1) == 0)) {
+            /* /<fragment-name>/__overlay__ */
+            rel_path = "";
+            rel_path_len = 0;
+        } else {
+            /* Symbol refers to something that won't end
+             * up in the target tree */
+            continue;
+        }
+
+        /* find the fragment index in which the symbol lies */
+        ret = fdt_subnode_offset_namelen(fdto, 0, frag_name,
+                           frag_name_len);
+        /* not found? */
+        if (ret < 0)
+            return -FDT_ERR_BADOVERLAY;
+        fragment = ret;
+
+        /* an __overlay__ subnode must exist */
+        ret = fdt_subnode_offset(fdto, fragment, "__overlay__");
+        if (ret < 0)
+            return -FDT_ERR_BADOVERLAY;
+
+        /* get the target of the fragment */
+        ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
+        if (ret < 0)
+            return ret;
+        target = ret;
+
+        /* if we have a target path use */
+        if (!target_path) {
+            ret = get_path_len(fdt, target);
+            if (ret < 0)
+                return ret;
+            len = ret;
+        } else {
+            len = strlen(target_path);
+        }
+
+        ret = fdt_setprop_placeholder(fdt, root_sym, name,
+                len + (len > 1) + rel_path_len + 1, &p);
+        if (ret < 0)
+            return ret;
+
+        if (!target_path) {
+            /* again in case setprop_placeholder changed it */
+            ret = fdt_overlay_target_offset(fdt, fdto, fragment, &target_path);
+            if (ret < 0)
+                return ret;
+            target = ret;
+        }
+
+        buf = p;
+        if (len > 1) { /* target is not root */
+            if (!target_path) {
+                ret = fdt_get_path(fdt, target, buf, len + 1);
+                if (ret < 0)
+                    return ret;
+            } else
+                memcpy(buf, target_path, len + 1);
+
+        } else
+            len--;
+
+        buf[len] = '/';
+        memcpy(buf + len + 1, rel_path, rel_path_len);
+        buf[len + 1 + rel_path_len] = '\0';
+    }
+
+    return 0;
+}
+
+int fdt_overlay_apply(void *fdt, void *fdto)
+{
+    uint32_t delta;
+    int ret;
+
+    FDT_RO_PROBE(fdt);
+    FDT_RO_PROBE(fdto);
+
+    ret = fdt_find_max_phandle(fdt, &delta);
+    if (ret)
+        goto err;
+
+    ret = overlay_adjust_local_phandles(fdto, delta);
+    if (ret)
+        goto err;
+
+    ret = overlay_update_local_references(fdto, delta);
+    if (ret)
+        goto err;
+
+    ret = overlay_fixup_phandles(fdt, fdto);
+    if (ret)
+        goto err;
+
+    ret = overlay_merge(fdt, fdto);
+    if (ret)
+        goto err;
+
+    ret = overlay_symbol_update(fdt, fdto);
+    if (ret)
+        goto err;
+
+    /*
+     * The overlay has been damaged, erase its magic.
+     */
+    fdt_set_magic(fdto, ~0);
+
+    return 0;
+
+err:
+    /*
+     * The overlay might have been damaged, erase its magic.
+     */
+    fdt_set_magic(fdto, ~0);
+
+    /*
+     * The base device tree might have been damaged, erase its
+     * magic.
+     */
+    fdt_set_magic(fdt, ~0);
+
+    return ret;
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_ro.c

@@ -0,0 +1,859 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int fdt_nodename_eq_(const void *fdt, int offset,
+                const char *s, int len)
+{
+    int olen;
+    const char *p = fdt_get_name(fdt, offset, &olen);
+
+    if (!p || olen < len)
+        /* short match */
+        return 0;
+
+    if (memcmp(p, s, len) != 0)
+        return 0;
+
+    if (p[len] == '\0')
+        return 1;
+    else if (!memchr(s, '@', len) && (p[len] == '@'))
+        return 1;
+    else
+        return 0;
+}
+
+const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
+{
+    int32_t totalsize;
+    uint32_t absoffset;
+    size_t len;
+    int err;
+    const char *s, *n;
+
+    if (can_assume(VALID_INPUT)) {
+        s = (const char *)fdt + fdt_off_dt_strings(fdt) + stroffset;
+
+        if (lenp)
+            *lenp = strlen(s);
+        return s;
+    }
+    totalsize = fdt_ro_probe_(fdt);
+    err = totalsize;
+    if (totalsize < 0)
+        goto fail;
+
+    err = -FDT_ERR_BADOFFSET;
+    absoffset = stroffset + fdt_off_dt_strings(fdt);
+    if (absoffset >= (unsigned)totalsize)
+        goto fail;
+    len = totalsize - absoffset;
+
+    if (fdt_magic(fdt) == FDT_MAGIC) {
+        if (stroffset < 0)
+            goto fail;
+        if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
+            if ((unsigned)stroffset >= fdt_size_dt_strings(fdt))
+                goto fail;
+            if ((fdt_size_dt_strings(fdt) - stroffset) < len)
+                len = fdt_size_dt_strings(fdt) - stroffset;
+        }
+    } else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
+        unsigned int sw_stroffset = -stroffset;
+
+        if ((stroffset >= 0) ||
+            (sw_stroffset > fdt_size_dt_strings(fdt)))
+            goto fail;
+        if (sw_stroffset < len)
+            len = sw_stroffset;
+    } else {
+        err = -FDT_ERR_INTERNAL;
+        goto fail;
+    }
+
+    s = (const char *)fdt + absoffset;
+    n = memchr(s, '\0', len);
+    if (!n) {
+        /* missing terminating NULL */
+        err = -FDT_ERR_TRUNCATED;
+        goto fail;
+    }
+
+    if (lenp)
+        *lenp = n - s;
+    return s;
+
+fail:
+    if (lenp)
+        *lenp = err;
+    return NULL;
+}
+
+const char *fdt_string(const void *fdt, int stroffset)
+{
+    return fdt_get_string(fdt, stroffset, NULL);
+}
+
+static int fdt_string_eq_(const void *fdt, int stroffset,
+              const char *s, int len)
+{
+    int slen;
+    const char *p = fdt_get_string(fdt, stroffset, &slen);
+
+    return p && (slen == len) && (memcmp(p, s, len) == 0);
+}
+
+int fdt_find_max_phandle(const void *fdt, uint32_t *phandle)
+{
+    uint32_t max = 0;
+    int offset = -1;
+
+    while (true) {
+        uint32_t value;
+
+        offset = fdt_next_node(fdt, offset, NULL);
+        if (offset < 0) {
+            if (offset == -FDT_ERR_NOTFOUND)
+                break;
+
+            return offset;
+        }
+
+        value = fdt_get_phandle(fdt, offset);
+
+        if (value > max)
+            max = value;
+    }
+
+    if (phandle)
+        *phandle = max;
+
+    return 0;
+}
+
+int fdt_generate_phandle(const void *fdt, uint32_t *phandle)
+{
+    uint32_t max;
+    int err;
+
+    err = fdt_find_max_phandle(fdt, &max);
+    if (err < 0)
+        return err;
+
+    if (max == FDT_MAX_PHANDLE)
+        return -FDT_ERR_NOPHANDLES;
+
+    if (phandle)
+        *phandle = max + 1;
+
+    return 0;
+}
+
+static const struct fdt_reserve_entry *fdt_mem_rsv(const void *fdt, int n)
+{
+    unsigned int offset = n * sizeof(struct fdt_reserve_entry);
+    unsigned int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
+
+    if (!can_assume(VALID_INPUT)) {
+        if (absoffset < fdt_off_mem_rsvmap(fdt))
+            return NULL;
+        if (absoffset > fdt_totalsize(fdt) -
+            sizeof(struct fdt_reserve_entry))
+            return NULL;
+    }
+    return fdt_mem_rsv_(fdt, n);
+}
+
+int fdt_get_mem_rsv(const void *fdt, int n, uint64_t *address, uint64_t *size)
+{
+    const struct fdt_reserve_entry *re;
+
+    FDT_RO_PROBE(fdt);
+    re = fdt_mem_rsv(fdt, n);
+    if (!can_assume(VALID_INPUT) && !re)
+        return -FDT_ERR_BADOFFSET;
+
+    *address = fdt64_ld_(&re->address);
+    *size = fdt64_ld_(&re->size);
+    return 0;
+}
+
+int fdt_num_mem_rsv(const void *fdt)
+{
+    int i;
+    const struct fdt_reserve_entry *re;
+
+    for (i = 0; (re = fdt_mem_rsv(fdt, i)) != NULL; i++) {
+        if (fdt64_ld_(&re->size) == 0)
+            return i;
+    }
+    return -FDT_ERR_TRUNCATED;
+}
+
+static int nextprop_(const void *fdt, int offset)
+{
+    uint32_t tag;
+    int nextoffset;
+
+    do {
+        tag = fdt_next_tag(fdt, offset, &nextoffset);
+
+        switch (tag) {
+        case FDT_END:
+            if (nextoffset >= 0)
+                return -FDT_ERR_BADSTRUCTURE;
+            else
+                return nextoffset;
+
+        case FDT_PROP:
+            return offset;
+        }
+        offset = nextoffset;
+    } while (tag == FDT_NOP);
+
+    return -FDT_ERR_NOTFOUND;
+}
+
+int fdt_subnode_offset_namelen(const void *fdt, int offset,
+                   const char *name, int namelen)
+{
+    int depth;
+
+    FDT_RO_PROBE(fdt);
+
+    for (depth = 0;
+         (offset >= 0) && (depth >= 0);
+         offset = fdt_next_node(fdt, offset, &depth))
+        if ((depth == 1)
+            && fdt_nodename_eq_(fdt, offset, name, namelen))
+            return offset;
+
+    if (depth < 0)
+        return -FDT_ERR_NOTFOUND;
+    return offset; /* error */
+}
+
+int fdt_subnode_offset(const void *fdt, int parentoffset,
+               const char *name)
+{
+    return fdt_subnode_offset_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_path_offset_namelen(const void *fdt, const char *path, int namelen)
+{
+    const char *end = path + namelen;
+    const char *p = path;
+    int offset = 0;
+
+    FDT_RO_PROBE(fdt);
+
+    /* see if we have an alias */
+    if (*path != '/') {
+        const char *q = memchr(path, '/', end - p);
+
+        if (!q)
+            q = end;
+
+        p = fdt_get_alias_namelen(fdt, p, q - p);
+        if (!p)
+            return -FDT_ERR_BADPATH;
+        offset = fdt_path_offset(fdt, p);
+
+        p = q;
+    }
+
+    while (p < end) {
+        const char *q;
+
+        while (*p == '/') {
+            p++;
+            if (p == end)
+                return offset;
+        }
+        q = memchr(p, '/', end - p);
+        if (! q)
+            q = end;
+
+        offset = fdt_subnode_offset_namelen(fdt, offset, p, q-p);
+        if (offset < 0)
+            return offset;
+
+        p = q;
+    }
+
+    return offset;
+}
+
+int fdt_path_offset(const void *fdt, const char *path)
+{
+    return fdt_path_offset_namelen(fdt, path, strlen(path));
+}
+
+const char *fdt_get_name(const void *fdt, int nodeoffset, int *len)
+{
+    const struct fdt_node_header *nh = fdt_offset_ptr_(fdt, nodeoffset);
+    const char *nameptr;
+    int err;
+
+    if (((err = fdt_ro_probe_(fdt)) < 0)
+        || ((err = fdt_check_node_offset_(fdt, nodeoffset)) < 0))
+            goto fail;
+
+    nameptr = nh->name;
+
+    if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
+        /*
+         * For old FDT versions, match the naming conventions of V16:
+         * give only the leaf name (after all /). The actual tree
+         * contents are loosely checked.
+         */
+        const char *leaf;
+        leaf = strrchr(nameptr, '/');
+        if (leaf == NULL) {
+            err = -FDT_ERR_BADSTRUCTURE;
+            goto fail;
+        }
+        nameptr = leaf+1;
+    }
+
+    if (len)
+        *len = strlen(nameptr);
+
+    return nameptr;
+
+ fail:
+    if (len)
+        *len = err;
+    return NULL;
+}
+
+int fdt_first_property_offset(const void *fdt, int nodeoffset)
+{
+    int offset;
+
+    if ((offset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
+        return offset;
+
+    return nextprop_(fdt, offset);
+}
+
+int fdt_next_property_offset(const void *fdt, int offset)
+{
+    if ((offset = fdt_check_prop_offset_(fdt, offset)) < 0)
+        return offset;
+
+    return nextprop_(fdt, offset);
+}
+
+static const struct fdt_property *fdt_get_property_by_offset_(const void *fdt,
+                                      int offset,
+                                      int *lenp)
+{
+    int err;
+    const struct fdt_property *prop;
+
+    if (!can_assume(VALID_INPUT) &&
+        (err = fdt_check_prop_offset_(fdt, offset)) < 0) {
+        if (lenp)
+            *lenp = err;
+        return NULL;
+    }
+
+    prop = fdt_offset_ptr_(fdt, offset);
+
+    if (lenp)
+        *lenp = fdt32_ld_(&prop->len);
+
+    return prop;
+}
+
+const struct fdt_property *fdt_get_property_by_offset(const void *fdt,
+                              int offset,
+                              int *lenp)
+{
+    /* Prior to version 16, properties may need realignment
+     * and this API does not work. fdt_getprop_*() will, however. */
+
+    if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
+        if (lenp)
+            *lenp = -FDT_ERR_BADVERSION;
+        return NULL;
+    }
+
+    return fdt_get_property_by_offset_(fdt, offset, lenp);
+}
+
+static const struct fdt_property *fdt_get_property_namelen_(const void *fdt,
+                                    int offset,
+                                    const char *name,
+                                    int namelen,
+                                int *lenp,
+                                int *poffset)
+{
+    for (offset = fdt_first_property_offset(fdt, offset);
+         (offset >= 0);
+         (offset = fdt_next_property_offset(fdt, offset))) {
+        const struct fdt_property *prop;
+
+        prop = fdt_get_property_by_offset_(fdt, offset, lenp);
+        if (!can_assume(LIBFDT_FLAWLESS) && !prop) {
+            offset = -FDT_ERR_INTERNAL;
+            break;
+        }
+        if (fdt_string_eq_(fdt, fdt32_ld_(&prop->nameoff),
+                   name, namelen)) {
+            if (poffset)
+                *poffset = offset;
+            return prop;
+        }
+    }
+
+    if (lenp)
+        *lenp = offset;
+    return NULL;
+}
+
+
+const struct fdt_property *fdt_get_property_namelen(const void *fdt,
+                            int offset,
+                            const char *name,
+                            int namelen, int *lenp)
+{
+    /* Prior to version 16, properties may need realignment
+     * and this API does not work. fdt_getprop_*() will, however. */
+    if (!can_assume(LATEST) && fdt_version(fdt) < 0x10) {
+        if (lenp)
+            *lenp = -FDT_ERR_BADVERSION;
+        return NULL;
+    }
+
+    return fdt_get_property_namelen_(fdt, offset, name, namelen, lenp,
+                     NULL);
+}
+
+
+const struct fdt_property *fdt_get_property(const void *fdt,
+                        int nodeoffset,
+                        const char *name, int *lenp)
+{
+    return fdt_get_property_namelen(fdt, nodeoffset, name,
+                    strlen(name), lenp);
+}
+
+const void *fdt_getprop_namelen(const void *fdt, int nodeoffset,
+                const char *name, int namelen, int *lenp)
+{
+    int poffset;
+    const struct fdt_property *prop;
+
+    prop = fdt_get_property_namelen_(fdt, nodeoffset, name, namelen, lenp,
+                     &poffset);
+    if (!prop)
+        return NULL;
+
+    /* Handle realignment */
+    if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
+        (poffset + sizeof(*prop)) % 8 && fdt32_ld_(&prop->len) >= 8)
+        return prop->data + 4;
+    return prop->data;
+}
+
+const void *fdt_getprop_by_offset(const void *fdt, int offset,
+                  const char **namep, int *lenp)
+{
+    const struct fdt_property *prop;
+
+    prop = fdt_get_property_by_offset_(fdt, offset, lenp);
+    if (!prop)
+        return NULL;
+    if (namep) {
+        const char *name;
+        int namelen;
+
+        if (!can_assume(VALID_INPUT)) {
+            name = fdt_get_string(fdt, fdt32_ld_(&prop->nameoff),
+                          &namelen);
+            *namep = name;
+            if (!name) {
+                if (lenp)
+                    *lenp = namelen;
+                return NULL;
+            }
+        } else {
+            *namep = fdt_string(fdt, fdt32_ld_(&prop->nameoff));
+        }
+    }
+
+    /* Handle realignment */
+    if (!can_assume(LATEST) && fdt_version(fdt) < 0x10 &&
+        (offset + sizeof(*prop)) % 8 && fdt32_ld_(&prop->len) >= 8)
+        return prop->data + 4;
+    return prop->data;
+}
+
+const void *fdt_getprop(const void *fdt, int nodeoffset,
+            const char *name, int *lenp)
+{
+    return fdt_getprop_namelen(fdt, nodeoffset, name, strlen(name), lenp);
+}
+
+uint32_t fdt_get_phandle(const void *fdt, int nodeoffset)
+{
+    const fdt32_t *php;
+    int len;
+
+    /* FIXME: This is a bit sub-optimal, since we potentially scan
+     * over all the properties twice. */
+    php = fdt_getprop(fdt, nodeoffset, "phandle", &len);
+    if (!php || (len != sizeof(*php))) {
+        php = fdt_getprop(fdt, nodeoffset, "linux,phandle", &len);
+        if (!php || (len != sizeof(*php)))
+            return 0;
+    }
+
+    return fdt32_ld_(php);
+}
+
+const char *fdt_get_alias_namelen(const void *fdt,
+                  const char *name, int namelen)
+{
+    int aliasoffset;
+
+    aliasoffset = fdt_path_offset(fdt, "/aliases");
+    if (aliasoffset < 0)
+        return NULL;
+
+    return fdt_getprop_namelen(fdt, aliasoffset, name, namelen, NULL);
+}
+
+const char *fdt_get_alias(const void *fdt, const char *name)
+{
+    return fdt_get_alias_namelen(fdt, name, strlen(name));
+}
+
+int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen)
+{
+    int pdepth = 0, p = 0;
+    int offset, depth, namelen;
+    const char *name;
+
+    FDT_RO_PROBE(fdt);
+
+    if (buflen < 2)
+        return -FDT_ERR_NOSPACE;
+
+    for (offset = 0, depth = 0;
+         (offset >= 0) && (offset <= nodeoffset);
+         offset = fdt_next_node(fdt, offset, &depth)) {
+        while (pdepth > depth) {
+            do {
+                p--;
+            } while (buf[p-1] != '/');
+            pdepth--;
+        }
+
+        if (pdepth >= depth) {
+            name = fdt_get_name(fdt, offset, &namelen);
+            if (!name)
+                return namelen;
+            if ((p + namelen + 1) <= buflen) {
+                memcpy(buf + p, name, namelen);
+                p += namelen;
+                buf[p++] = '/';
+                pdepth++;
+            }
+        }
+
+        if (offset == nodeoffset) {
+            if (pdepth < (depth + 1))
+                return -FDT_ERR_NOSPACE;
+
+            if (p > 1) /* special case so that root path is "/", not "" */
+                p--;
+            buf[p] = '\0';
+            return 0;
+        }
+    }
+
+    if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+        return -FDT_ERR_BADOFFSET;
+    else if (offset == -FDT_ERR_BADOFFSET)
+        return -FDT_ERR_BADSTRUCTURE;
+
+    return offset; /* error from fdt_next_node() */
+}
+
+int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
+                 int supernodedepth, int *nodedepth)
+{
+    int offset, depth;
+    int supernodeoffset = -FDT_ERR_INTERNAL;
+
+    FDT_RO_PROBE(fdt);
+
+    if (supernodedepth < 0)
+        return -FDT_ERR_NOTFOUND;
+
+    for (offset = 0, depth = 0;
+         (offset >= 0) && (offset <= nodeoffset);
+         offset = fdt_next_node(fdt, offset, &depth)) {
+        if (depth == supernodedepth)
+            supernodeoffset = offset;
+
+        if (offset == nodeoffset) {
+            if (nodedepth)
+                *nodedepth = depth;
+
+            if (supernodedepth > depth)
+                return -FDT_ERR_NOTFOUND;
+            else
+                return supernodeoffset;
+        }
+    }
+
+    if (!can_assume(VALID_INPUT)) {
+        if ((offset == -FDT_ERR_NOTFOUND) || (offset >= 0))
+            return -FDT_ERR_BADOFFSET;
+        else if (offset == -FDT_ERR_BADOFFSET)
+            return -FDT_ERR_BADSTRUCTURE;
+    }
+
+    return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_depth(const void *fdt, int nodeoffset)
+{
+    int nodedepth;
+    int err;
+
+    err = fdt_supernode_atdepth_offset(fdt, nodeoffset, 0, &nodedepth);
+    if (err)
+        return (can_assume(LIBFDT_FLAWLESS) || err < 0) ? err :
+            -FDT_ERR_INTERNAL;
+    return nodedepth;
+}
+
+int fdt_parent_offset(const void *fdt, int nodeoffset)
+{
+    int nodedepth = fdt_node_depth(fdt, nodeoffset);
+
+    if (nodedepth < 0)
+        return nodedepth;
+    return fdt_supernode_atdepth_offset(fdt, nodeoffset,
+                        nodedepth - 1, NULL);
+}
+
+int fdt_node_offset_by_prop_value(const void *fdt, int startoffset,
+                  const char *propname,
+                  const void *propval, int proplen)
+{
+    int offset;
+    const void *val;
+    int len;
+
+    FDT_RO_PROBE(fdt);
+
+    /* FIXME: The algorithm here is pretty horrible: we scan each
+     * property of a node in fdt_getprop(), then if that didn't
+     * find what we want, we scan over them again making our way
+     * to the next node.  Still it's the easiest to implement
+     * approach; performance can come later. */
+    for (offset = fdt_next_node(fdt, startoffset, NULL);
+         offset >= 0;
+         offset = fdt_next_node(fdt, offset, NULL)) {
+        val = fdt_getprop(fdt, offset, propname, &len);
+        if (val && (len == proplen)
+            && (memcmp(val, propval, len) == 0))
+            return offset;
+    }
+
+    return offset; /* error from fdt_next_node() */
+}
+
+int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
+{
+    int offset;
+
+    if ((phandle == 0) || (phandle == ~0U))
+        return -FDT_ERR_BADPHANDLE;
+
+    FDT_RO_PROBE(fdt);
+
+    /* FIXME: The algorithm here is pretty horrible: we
+     * potentially scan each property of a node in
+     * fdt_get_phandle(), then if that didn't find what
+     * we want, we scan over them again making our way to the next
+     * node.  Still it's the easiest to implement approach;
+     * performance can come later. */
+    for (offset = fdt_next_node(fdt, -1, NULL);
+         offset >= 0;
+         offset = fdt_next_node(fdt, offset, NULL)) {
+        if (fdt_get_phandle(fdt, offset) == phandle)
+            return offset;
+    }
+
+    return offset; /* error from fdt_next_node() */
+}
+
+int fdt_stringlist_contains(const char *strlist, int listlen, const char *str)
+{
+    int len = strlen(str);
+    const char *p;
+
+    while (listlen >= len) {
+        if (memcmp(str, strlist, len+1) == 0)
+            return 1;
+        p = memchr(strlist, '\0', listlen);
+        if (!p)
+            return 0; /* malformed strlist.. */
+        listlen -= (p-strlist) + 1;
+        strlist = p + 1;
+    }
+    return 0;
+}
+
+int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property)
+{
+    const char *list, *end;
+    int length, count = 0;
+
+    list = fdt_getprop(fdt, nodeoffset, property, &length);
+    if (!list)
+        return length;
+
+    end = list + length;
+
+    while (list < end) {
+        length = strnlen(list, end - list) + 1;
+
+        /* Abort if the last string isn't properly NUL-terminated. */
+        if (list + length > end)
+            return -FDT_ERR_BADVALUE;
+
+        list += length;
+        count++;
+    }
+
+    return count;
+}
+
+int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property,
+              const char *string)
+{
+    int length, len, idx = 0;
+    const char *list, *end;
+
+    list = fdt_getprop(fdt, nodeoffset, property, &length);
+    if (!list)
+        return length;
+
+    len = strlen(string) + 1;
+    end = list + length;
+
+    while (list < end) {
+        length = strnlen(list, end - list) + 1;
+
+        /* Abort if the last string isn't properly NUL-terminated. */
+        if (list + length > end)
+            return -FDT_ERR_BADVALUE;
+
+        if (length == len && memcmp(list, string, length) == 0)
+            return idx;
+
+        list += length;
+        idx++;
+    }
+
+    return -FDT_ERR_NOTFOUND;
+}
+
+const char *fdt_stringlist_get(const void *fdt, int nodeoffset,
+                   const char *property, int idx,
+                   int *lenp)
+{
+    const char *list, *end;
+    int length;
+
+    list = fdt_getprop(fdt, nodeoffset, property, &length);
+    if (!list) {
+        if (lenp)
+            *lenp = length;
+
+        return NULL;
+    }
+
+    end = list + length;
+
+    while (list < end) {
+        length = strnlen(list, end - list) + 1;
+
+        /* Abort if the last string isn't properly NUL-terminated. */
+        if (list + length > end) {
+            if (lenp)
+                *lenp = -FDT_ERR_BADVALUE;
+
+            return NULL;
+        }
+
+        if (idx == 0) {
+            if (lenp)
+                *lenp = length - 1;
+
+            return list;
+        }
+
+        list += length;
+        idx--;
+    }
+
+    if (lenp)
+        *lenp = -FDT_ERR_NOTFOUND;
+
+    return NULL;
+}
+
+int fdt_node_check_compatible(const void *fdt, int nodeoffset,
+                  const char *compatible)
+{
+    const void *prop;
+    int len;
+
+    prop = fdt_getprop(fdt, nodeoffset, "compatible", &len);
+    if (!prop)
+        return len;
+
+    return !fdt_stringlist_contains(prop, len, compatible);
+}
+
+int fdt_node_offset_by_compatible(const void *fdt, int startoffset,
+                  const char *compatible)
+{
+    int offset, err;
+
+    FDT_RO_PROBE(fdt);
+
+    /* FIXME: The algorithm here is pretty horrible: we scan each
+     * property of a node in fdt_node_check_compatible(), then if
+     * that didn't find what we want, we scan over them again
+     * making our way to the next node.  Still it's the easiest to
+     * implement approach; performance can come later. */
+    for (offset = fdt_next_node(fdt, startoffset, NULL);
+         offset >= 0;
+         offset = fdt_next_node(fdt, offset, NULL)) {
+        err = fdt_node_check_compatible(fdt, offset, compatible);
+        if ((err < 0) && (err != -FDT_ERR_NOTFOUND))
+            return err;
+        else if (err == 0)
+            return offset;
+    }
+
+    return offset; /* error from fdt_next_node() */
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_rw.c

@@ -0,0 +1,500 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int fdt_blocks_misordered_(const void *fdt,
+                  int mem_rsv_size, int struct_size)
+{
+    return (fdt_off_mem_rsvmap(fdt) < FDT_ALIGN(sizeof(struct fdt_header), 8))
+        || (fdt_off_dt_struct(fdt) <
+            (fdt_off_mem_rsvmap(fdt) + mem_rsv_size))
+        || (fdt_off_dt_strings(fdt) <
+            (fdt_off_dt_struct(fdt) + struct_size))
+        || (fdt_totalsize(fdt) <
+            (fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt)));
+}
+
+static int fdt_rw_probe_(void *fdt)
+{
+    if (can_assume(VALID_DTB))
+        return 0;
+    FDT_RO_PROBE(fdt);
+
+    if (!can_assume(LATEST) && fdt_version(fdt) < 17)
+        return -FDT_ERR_BADVERSION;
+    if (fdt_blocks_misordered_(fdt, sizeof(struct fdt_reserve_entry),
+                   fdt_size_dt_struct(fdt)))
+        return -FDT_ERR_BADLAYOUT;
+    if (!can_assume(LATEST) && fdt_version(fdt) > 17)
+        fdt_set_version(fdt, 17);
+
+    return 0;
+}
+
+#define FDT_RW_PROBE(fdt) \
+    { \
+        int err_; \
+        if ((err_ = fdt_rw_probe_(fdt)) != 0) \
+            return err_; \
+    }
+
+static inline unsigned int fdt_data_size_(void *fdt)
+{
+    return fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+}
+
+static int fdt_splice_(void *fdt, void *splicepoint, int oldlen, int newlen)
+{
+    char *p = splicepoint;
+    unsigned int dsize = fdt_data_size_(fdt);
+    size_t soff = p - (char *)fdt;
+
+    if ((oldlen < 0) || (soff + oldlen < soff) || (soff + oldlen > dsize))
+        return -FDT_ERR_BADOFFSET;
+    if ((p < (char *)fdt) || (dsize + newlen < (unsigned)oldlen))
+        return -FDT_ERR_BADOFFSET;
+    if (dsize - oldlen + newlen > fdt_totalsize(fdt))
+        return -FDT_ERR_NOSPACE;
+    memmove(p + newlen, p + oldlen, ((char *)fdt + dsize) - (p + oldlen));
+    return 0;
+}
+
+static int fdt_splice_mem_rsv_(void *fdt, struct fdt_reserve_entry *p,
+                   int oldn, int newn)
+{
+    int delta = (newn - oldn) * sizeof(*p);
+    int err;
+    err = fdt_splice_(fdt, p, oldn * sizeof(*p), newn * sizeof(*p));
+    if (err)
+        return err;
+    fdt_set_off_dt_struct(fdt, fdt_off_dt_struct(fdt) + delta);
+    fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+    return 0;
+}
+
+static int fdt_splice_struct_(void *fdt, void *p,
+                  int oldlen, int newlen)
+{
+    int delta = newlen - oldlen;
+    int err;
+
+    if ((err = fdt_splice_(fdt, p, oldlen, newlen)))
+        return err;
+
+    fdt_set_size_dt_struct(fdt, fdt_size_dt_struct(fdt) + delta);
+    fdt_set_off_dt_strings(fdt, fdt_off_dt_strings(fdt) + delta);
+    return 0;
+}
+
+/* Must only be used to roll back in case of error */
+static void fdt_del_last_string_(void *fdt, const char *s)
+{
+    int newlen = strlen(s) + 1;
+
+    fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) - newlen);
+}
+
+static int fdt_splice_string_(void *fdt, int newlen)
+{
+    void *p = (char *)fdt
+        + fdt_off_dt_strings(fdt) + fdt_size_dt_strings(fdt);
+    int err;
+
+    if ((err = fdt_splice_(fdt, p, 0, newlen)))
+        return err;
+
+    fdt_set_size_dt_strings(fdt, fdt_size_dt_strings(fdt) + newlen);
+    return 0;
+}
+
+/**
+ * fdt_find_add_string_() - Find or allocate a string
+ *
+ * @fdt: pointer to the device tree to check/adjust
+ * @s: string to find/add
+ * @allocated: Set to 0 if the string was found, 1 if not found and so
+ *  allocated. Ignored if can_assume(NO_ROLLBACK)
+ * @return offset of string in the string table (whether found or added)
+ */
+static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
+{
+    char *strtab = (char *)fdt + fdt_off_dt_strings(fdt);
+    const char *p;
+    char *new;
+    int len = strlen(s) + 1;
+    int err;
+
+    if (!can_assume(NO_ROLLBACK))
+        *allocated = 0;
+
+    p = fdt_find_string_(strtab, fdt_size_dt_strings(fdt), s);
+    if (p)
+        /* found it */
+        return (p - strtab);
+
+    new = strtab + fdt_size_dt_strings(fdt);
+    err = fdt_splice_string_(fdt, len);
+    if (err)
+        return err;
+
+    if (!can_assume(NO_ROLLBACK))
+        *allocated = 1;
+
+    memcpy(new, s, len);
+    return (new - strtab);
+}
+
+int fdt_add_mem_rsv(void *fdt, uint64_t address, uint64_t size)
+{
+    struct fdt_reserve_entry *re;
+    int err;
+
+    FDT_RW_PROBE(fdt);
+
+    re = fdt_mem_rsv_w_(fdt, fdt_num_mem_rsv(fdt));
+    err = fdt_splice_mem_rsv_(fdt, re, 0, 1);
+    if (err)
+        return err;
+
+    re->address = cpu_to_fdt64(address);
+    re->size = cpu_to_fdt64(size);
+    return 0;
+}
+
+int fdt_del_mem_rsv(void *fdt, int n)
+{
+    struct fdt_reserve_entry *re = fdt_mem_rsv_w_(fdt, n);
+
+    FDT_RW_PROBE(fdt);
+
+    if (n >= fdt_num_mem_rsv(fdt))
+        return -FDT_ERR_NOTFOUND;
+
+    return fdt_splice_mem_rsv_(fdt, re, 1, 0);
+}
+
+static int fdt_resize_property_(void *fdt, int nodeoffset, const char *name,
+                int len, struct fdt_property **prop)
+{
+    int oldlen;
+    int err;
+
+    *prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+    if (!*prop)
+        return oldlen;
+
+    if ((err = fdt_splice_struct_(fdt, (*prop)->data, FDT_TAGALIGN(oldlen),
+                      FDT_TAGALIGN(len))))
+        return err;
+
+    (*prop)->len = cpu_to_fdt32(len);
+    return 0;
+}
+
+static int fdt_add_property_(void *fdt, int nodeoffset, const char *name,
+                 int len, struct fdt_property **prop)
+{
+    int proplen;
+    int nextoffset;
+    int namestroff;
+    int err;
+    int allocated;
+
+    if ((nextoffset = fdt_check_node_offset_(fdt, nodeoffset)) < 0)
+        return nextoffset;
+
+    namestroff = fdt_find_add_string_(fdt, name, &allocated);
+    if (namestroff < 0)
+        return namestroff;
+
+    *prop = fdt_offset_ptr_w_(fdt, nextoffset);
+    proplen = sizeof(**prop) + FDT_TAGALIGN(len);
+
+    err = fdt_splice_struct_(fdt, *prop, 0, proplen);
+    if (err) {
+        /* Delete the string if we failed to add it */
+        if (!can_assume(NO_ROLLBACK) && allocated)
+            fdt_del_last_string_(fdt, name);
+        return err;
+    }
+
+    (*prop)->tag = cpu_to_fdt32(FDT_PROP);
+    (*prop)->nameoff = cpu_to_fdt32(namestroff);
+    (*prop)->len = cpu_to_fdt32(len);
+    return 0;
+}
+
+int fdt_set_name(void *fdt, int nodeoffset, const char *name)
+{
+    char *namep;
+    int oldlen, newlen;
+    int err;
+
+    FDT_RW_PROBE(fdt);
+
+    namep = (char *)(uintptr_t)fdt_get_name(fdt, nodeoffset, &oldlen);
+    if (!namep)
+        return oldlen;
+
+    newlen = strlen(name);
+
+    err = fdt_splice_struct_(fdt, namep, FDT_TAGALIGN(oldlen+1),
+                 FDT_TAGALIGN(newlen+1));
+    if (err)
+        return err;
+
+    memcpy(namep, name, newlen+1);
+    return 0;
+}
+
+int fdt_setprop_placeholder(void *fdt, int nodeoffset, const char *name,
+                int len, void **prop_data)
+{
+    struct fdt_property *prop;
+    int err;
+
+    FDT_RW_PROBE(fdt);
+
+    err = fdt_resize_property_(fdt, nodeoffset, name, len, &prop);
+    if (err == -FDT_ERR_NOTFOUND)
+        err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
+    if (err)
+        return err;
+
+    *prop_data = prop->data;
+    return 0;
+}
+
+int fdt_setprop(void *fdt, int nodeoffset, const char *name,
+        const void *val, int len)
+{
+    void *prop_data;
+    int err;
+
+    err = fdt_setprop_placeholder(fdt, nodeoffset, name, len, &prop_data);
+    if (err)
+        return err;
+
+    if (len)
+        memcpy(prop_data, val, len);
+    return 0;
+}
+
+int fdt_appendprop(void *fdt, int nodeoffset, const char *name,
+           const void *val, int len)
+{
+    struct fdt_property *prop;
+    int err, oldlen, newlen;
+
+    FDT_RW_PROBE(fdt);
+
+    prop = fdt_get_property_w(fdt, nodeoffset, name, &oldlen);
+    if (prop) {
+        newlen = len + oldlen;
+        err = fdt_splice_struct_(fdt, prop->data,
+                     FDT_TAGALIGN(oldlen),
+                     FDT_TAGALIGN(newlen));
+        if (err)
+            return err;
+        prop->len = cpu_to_fdt32(newlen);
+        memcpy(prop->data + oldlen, val, len);
+    } else {
+        err = fdt_add_property_(fdt, nodeoffset, name, len, &prop);
+        if (err)
+            return err;
+        memcpy(prop->data, val, len);
+    }
+    return 0;
+}
+
+int fdt_delprop(void *fdt, int nodeoffset, const char *name)
+{
+    struct fdt_property *prop;
+    int len, proplen;
+
+    FDT_RW_PROBE(fdt);
+
+    prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+    if (!prop)
+        return len;
+
+    proplen = sizeof(*prop) + FDT_TAGALIGN(len);
+    return fdt_splice_struct_(fdt, prop, proplen, 0);
+}
+
+int fdt_add_subnode_namelen(void *fdt, int parentoffset,
+                const char *name, int namelen)
+{
+    struct fdt_node_header *nh;
+    int offset, nextoffset;
+    int nodelen;
+    int err;
+    uint32_t tag;
+    fdt32_t *endtag;
+
+    FDT_RW_PROBE(fdt);
+
+    offset = fdt_subnode_offset_namelen(fdt, parentoffset, name, namelen);
+    if (offset >= 0)
+        return -FDT_ERR_EXISTS;
+    else if (offset != -FDT_ERR_NOTFOUND)
+        return offset;
+
+    /* Try to place the new node after the parent's properties */
+    tag = fdt_next_tag(fdt, parentoffset, &nextoffset);
+    /* the fdt_subnode_offset_namelen() should ensure this never hits */
+    if (!can_assume(LIBFDT_FLAWLESS) && (tag != FDT_BEGIN_NODE))
+        return -FDT_ERR_INTERNAL;
+    do {
+        offset = nextoffset;
+        tag = fdt_next_tag(fdt, offset, &nextoffset);
+    } while ((tag == FDT_PROP) || (tag == FDT_NOP));
+
+    nh = fdt_offset_ptr_w_(fdt, offset);
+    nodelen = sizeof(*nh) + FDT_TAGALIGN(namelen+1) + FDT_TAGSIZE;
+
+    err = fdt_splice_struct_(fdt, nh, 0, nodelen);
+    if (err)
+        return err;
+
+    nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+    memset(nh->name, 0, FDT_TAGALIGN(namelen+1));
+    memcpy(nh->name, name, namelen);
+    endtag = (fdt32_t *)((char *)nh + nodelen - FDT_TAGSIZE);
+    *endtag = cpu_to_fdt32(FDT_END_NODE);
+
+    return offset;
+}
+
+int fdt_add_subnode(void *fdt, int parentoffset, const char *name)
+{
+    return fdt_add_subnode_namelen(fdt, parentoffset, name, strlen(name));
+}
+
+int fdt_del_node(void *fdt, int nodeoffset)
+{
+    int endoffset;
+
+    FDT_RW_PROBE(fdt);
+
+    endoffset = fdt_node_end_offset_(fdt, nodeoffset);
+    if (endoffset < 0)
+        return endoffset;
+
+    return fdt_splice_struct_(fdt, fdt_offset_ptr_w_(fdt, nodeoffset),
+                  endoffset - nodeoffset, 0);
+}
+
+static void fdt_packblocks_(const char *old, char *new,
+                int mem_rsv_size,
+                int struct_size,
+                int strings_size)
+{
+    int mem_rsv_off, struct_off, strings_off;
+
+    mem_rsv_off = FDT_ALIGN(sizeof(struct fdt_header), 8);
+    struct_off = mem_rsv_off + mem_rsv_size;
+    strings_off = struct_off + struct_size;
+
+    memmove(new + mem_rsv_off, old + fdt_off_mem_rsvmap(old), mem_rsv_size);
+    fdt_set_off_mem_rsvmap(new, mem_rsv_off);
+
+    memmove(new + struct_off, old + fdt_off_dt_struct(old), struct_size);
+    fdt_set_off_dt_struct(new, struct_off);
+    fdt_set_size_dt_struct(new, struct_size);
+
+    memmove(new + strings_off, old + fdt_off_dt_strings(old), strings_size);
+    fdt_set_off_dt_strings(new, strings_off);
+    fdt_set_size_dt_strings(new, fdt_size_dt_strings(old));
+}
+
+int fdt_open_into(const void *fdt, void *buf, int bufsize)
+{
+    int err;
+    int mem_rsv_size, struct_size;
+    int newsize;
+    const char *fdtstart = fdt;
+    const char *fdtend = fdtstart + fdt_totalsize(fdt);
+    char *tmp;
+
+    FDT_RO_PROBE(fdt);
+
+    mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+        * sizeof(struct fdt_reserve_entry);
+
+    if (can_assume(LATEST) || fdt_version(fdt) >= 17) {
+        struct_size = fdt_size_dt_struct(fdt);
+    } else if (fdt_version(fdt) == 16) {
+        struct_size = 0;
+        while (fdt_next_tag(fdt, struct_size, &struct_size) != FDT_END)
+            ;
+        if (struct_size < 0)
+            return struct_size;
+    } else {
+        return -FDT_ERR_BADVERSION;
+    }
+
+    if (can_assume(LIBFDT_ORDER) ||
+        !fdt_blocks_misordered_(fdt, mem_rsv_size, struct_size)) {
+        /* no further work necessary */
+        err = fdt_move(fdt, buf, bufsize);
+        if (err)
+            return err;
+        fdt_set_version(buf, 17);
+        fdt_set_size_dt_struct(buf, struct_size);
+        fdt_set_totalsize(buf, bufsize);
+        return 0;
+    }
+
+    /* Need to reorder */
+    newsize = FDT_ALIGN(sizeof(struct fdt_header), 8) + mem_rsv_size
+        + struct_size + fdt_size_dt_strings(fdt);
+
+    if (bufsize < newsize)
+        return -FDT_ERR_NOSPACE;
+
+    /* First attempt to build converted tree at beginning of buffer */
+    tmp = buf;
+    /* But if that overlaps with the old tree... */
+    if (((tmp + newsize) > fdtstart) && (tmp < fdtend)) {
+        /* Try right after the old tree instead */
+        tmp = (char *)(uintptr_t)fdtend;
+        if ((tmp + newsize) > ((char *)buf + bufsize))
+            return -FDT_ERR_NOSPACE;
+    }
+
+    fdt_packblocks_(fdt, tmp, mem_rsv_size, struct_size,
+            fdt_size_dt_strings(fdt));
+    memmove(buf, tmp, newsize);
+
+    fdt_set_magic(buf, FDT_MAGIC);
+    fdt_set_totalsize(buf, bufsize);
+    fdt_set_version(buf, 17);
+    fdt_set_last_comp_version(buf, 16);
+    fdt_set_boot_cpuid_phys(buf, fdt_boot_cpuid_phys(fdt));
+
+    return 0;
+}
+
+int fdt_pack(void *fdt)
+{
+    int mem_rsv_size;
+
+    FDT_RW_PROBE(fdt);
+
+    mem_rsv_size = (fdt_num_mem_rsv(fdt)+1)
+        * sizeof(struct fdt_reserve_entry);
+    fdt_packblocks_(fdt, fdt, mem_rsv_size, fdt_size_dt_struct(fdt),
+            fdt_size_dt_strings(fdt));
+    fdt_set_totalsize(fdt, fdt_data_size_(fdt));
+
+    return 0;
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_strerror.c

@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ *     EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+struct fdt_errtabent {
+    const char *str;
+};
+
+#define FDT_ERRTABENT(val) \
+    [(val)] = { .str = #val, }
+
+static struct fdt_errtabent fdt_errtable[] = {
+    FDT_ERRTABENT(FDT_ERR_NOTFOUND),
+    FDT_ERRTABENT(FDT_ERR_EXISTS),
+    FDT_ERRTABENT(FDT_ERR_NOSPACE),
+
+    FDT_ERRTABENT(FDT_ERR_BADOFFSET),
+    FDT_ERRTABENT(FDT_ERR_BADPATH),
+    FDT_ERRTABENT(FDT_ERR_BADPHANDLE),
+    FDT_ERRTABENT(FDT_ERR_BADSTATE),
+
+    FDT_ERRTABENT(FDT_ERR_TRUNCATED),
+    FDT_ERRTABENT(FDT_ERR_BADMAGIC),
+    FDT_ERRTABENT(FDT_ERR_BADVERSION),
+    FDT_ERRTABENT(FDT_ERR_BADSTRUCTURE),
+    FDT_ERRTABENT(FDT_ERR_BADLAYOUT),
+    FDT_ERRTABENT(FDT_ERR_INTERNAL),
+    FDT_ERRTABENT(FDT_ERR_BADNCELLS),
+    FDT_ERRTABENT(FDT_ERR_BADVALUE),
+    FDT_ERRTABENT(FDT_ERR_BADOVERLAY),
+    FDT_ERRTABENT(FDT_ERR_NOPHANDLES),
+    FDT_ERRTABENT(FDT_ERR_BADFLAGS),
+    FDT_ERRTABENT(FDT_ERR_ALIGNMENT),
+};
+#define FDT_ERRTABSIZE  ((int)(sizeof(fdt_errtable) / sizeof(fdt_errtable[0])))
+
+const char *fdt_strerror(int errval)
+{
+    if (errval > 0)
+        return "<valid offset/length>";
+    else if (errval == 0)
+        return "<no error>";
+    else if (-errval < FDT_ERRTABSIZE) {
+        const char *s = fdt_errtable[-errval].str;
+
+        if (s)
+            return s;
+    }
+
+    return "<unknown error>";
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_sw.c

@@ -0,0 +1,384 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+static int fdt_sw_probe_(void *fdt)
+{
+    if (!can_assume(VALID_INPUT)) {
+        if (fdt_magic(fdt) == FDT_MAGIC)
+            return -FDT_ERR_BADSTATE;
+        else if (fdt_magic(fdt) != FDT_SW_MAGIC)
+            return -FDT_ERR_BADMAGIC;
+    }
+
+    return 0;
+}
+
+#define FDT_SW_PROBE(fdt) \
+    { \
+        int err; \
+        if ((err = fdt_sw_probe_(fdt)) != 0) \
+            return err; \
+    }
+
+/* 'memrsv' state:  Initial state after fdt_create()
+ *
+ * Allowed functions:
+ *  fdt_add_reservemap_entry()
+ *  fdt_finish_reservemap()     [moves to 'struct' state]
+ */
+static int fdt_sw_probe_memrsv_(void *fdt)
+{
+    int err = fdt_sw_probe_(fdt);
+    if (err)
+        return err;
+
+    if (!can_assume(VALID_INPUT) && fdt_off_dt_strings(fdt) != 0)
+        return -FDT_ERR_BADSTATE;
+    return 0;
+}
+
+#define FDT_SW_PROBE_MEMRSV(fdt) \
+    { \
+        int err; \
+        if ((err = fdt_sw_probe_memrsv_(fdt)) != 0) \
+            return err; \
+    }
+
+/* 'struct' state:  Enter this state after fdt_finish_reservemap()
+ *
+ * Allowed functions:
+ *  fdt_begin_node()
+ *  fdt_end_node()
+ *  fdt_property*()
+ *  fdt_finish()            [moves to 'complete' state]
+ */
+static int fdt_sw_probe_struct_(void *fdt)
+{
+    int err = fdt_sw_probe_(fdt);
+    if (err)
+        return err;
+
+    if (!can_assume(VALID_INPUT) &&
+        fdt_off_dt_strings(fdt) != fdt_totalsize(fdt))
+        return -FDT_ERR_BADSTATE;
+    return 0;
+}
+
+#define FDT_SW_PROBE_STRUCT(fdt) \
+    { \
+        int err; \
+        if ((err = fdt_sw_probe_struct_(fdt)) != 0) \
+            return err; \
+    }
+
+static inline uint32_t sw_flags(void *fdt)
+{
+    /* assert: (fdt_magic(fdt) == FDT_SW_MAGIC) */
+    return fdt_last_comp_version(fdt);
+}
+
+/* 'complete' state:    Enter this state after fdt_finish()
+ *
+ * Allowed functions: none
+ */
+
+static void *fdt_grab_space_(void *fdt, size_t len)
+{
+    unsigned int offset = fdt_size_dt_struct(fdt);
+    unsigned int spaceleft;
+
+    spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
+        - fdt_size_dt_strings(fdt);
+
+    if ((offset + len < offset) || (offset + len > spaceleft))
+        return NULL;
+
+    fdt_set_size_dt_struct(fdt, offset + len);
+    return fdt_offset_ptr_w_(fdt, offset);
+}
+
+int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags)
+{
+    const int hdrsize = FDT_ALIGN(sizeof(struct fdt_header),
+                      sizeof(struct fdt_reserve_entry));
+    void *fdt = buf;
+
+    if (bufsize < hdrsize)
+        return -FDT_ERR_NOSPACE;
+
+    if (flags & ~FDT_CREATE_FLAGS_ALL)
+        return -FDT_ERR_BADFLAGS;
+
+    memset(buf, 0, bufsize);
+
+    /*
+     * magic and last_comp_version keep intermediate state during the fdt
+     * creation process, which is replaced with the proper FDT format by
+     * fdt_finish().
+     *
+     * flags should be accessed with sw_flags().
+     */
+    fdt_set_magic(fdt, FDT_SW_MAGIC);
+    fdt_set_version(fdt, FDT_LAST_SUPPORTED_VERSION);
+    fdt_set_last_comp_version(fdt, flags);
+
+    fdt_set_totalsize(fdt,  bufsize);
+
+    fdt_set_off_mem_rsvmap(fdt, hdrsize);
+    fdt_set_off_dt_struct(fdt, fdt_off_mem_rsvmap(fdt));
+    fdt_set_off_dt_strings(fdt, 0);
+
+    return 0;
+}
+
+int fdt_create(void *buf, int bufsize)
+{
+    return fdt_create_with_flags(buf, bufsize, 0);
+}
+
+int fdt_resize(void *fdt, void *buf, int bufsize)
+{
+    size_t headsize, tailsize;
+    char *oldtail, *newtail;
+
+    FDT_SW_PROBE(fdt);
+
+    if (bufsize < 0)
+        return -FDT_ERR_NOSPACE;
+
+    headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+    tailsize = fdt_size_dt_strings(fdt);
+
+    if (!can_assume(VALID_DTB) &&
+        headsize + tailsize > fdt_totalsize(fdt))
+        return -FDT_ERR_INTERNAL;
+
+    if ((headsize + tailsize) > (unsigned)bufsize)
+        return -FDT_ERR_NOSPACE;
+
+    oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
+    newtail = (char *)buf + bufsize - tailsize;
+
+    /* Two cases to avoid clobbering data if the old and new
+     * buffers partially overlap */
+    if (buf <= fdt) {
+        memmove(buf, fdt, headsize);
+        memmove(newtail, oldtail, tailsize);
+    } else {
+        memmove(newtail, oldtail, tailsize);
+        memmove(buf, fdt, headsize);
+    }
+
+    fdt_set_totalsize(buf, bufsize);
+    if (fdt_off_dt_strings(buf))
+        fdt_set_off_dt_strings(buf, bufsize);
+
+    return 0;
+}
+
+int fdt_add_reservemap_entry(void *fdt, uint64_t addr, uint64_t size)
+{
+    struct fdt_reserve_entry *re;
+    int offset;
+
+    FDT_SW_PROBE_MEMRSV(fdt);
+
+    offset = fdt_off_dt_struct(fdt);
+    if ((offset + sizeof(*re)) > fdt_totalsize(fdt))
+        return -FDT_ERR_NOSPACE;
+
+    re = (struct fdt_reserve_entry *)((char *)fdt + offset);
+    re->address = cpu_to_fdt64(addr);
+    re->size = cpu_to_fdt64(size);
+
+    fdt_set_off_dt_struct(fdt, offset + sizeof(*re));
+
+    return 0;
+}
+
+int fdt_finish_reservemap(void *fdt)
+{
+    int err = fdt_add_reservemap_entry(fdt, 0, 0);
+
+    if (err)
+        return err;
+
+    fdt_set_off_dt_strings(fdt, fdt_totalsize(fdt));
+    return 0;
+}
+
+int fdt_begin_node(void *fdt, const char *name)
+{
+    struct fdt_node_header *nh;
+    int namelen;
+
+    FDT_SW_PROBE_STRUCT(fdt);
+
+    namelen = strlen(name) + 1;
+    nh = fdt_grab_space_(fdt, sizeof(*nh) + FDT_TAGALIGN(namelen));
+    if (! nh)
+        return -FDT_ERR_NOSPACE;
+
+    nh->tag = cpu_to_fdt32(FDT_BEGIN_NODE);
+    memcpy(nh->name, name, namelen);
+    return 0;
+}
+
+int fdt_end_node(void *fdt)
+{
+    fdt32_t *en;
+
+    FDT_SW_PROBE_STRUCT(fdt);
+
+    en = fdt_grab_space_(fdt, FDT_TAGSIZE);
+    if (! en)
+        return -FDT_ERR_NOSPACE;
+
+    *en = cpu_to_fdt32(FDT_END_NODE);
+    return 0;
+}
+
+static int fdt_add_string_(void *fdt, const char *s)
+{
+    char *strtab = (char *)fdt + fdt_totalsize(fdt);
+    unsigned int strtabsize = fdt_size_dt_strings(fdt);
+    unsigned int len = strlen(s) + 1;
+    unsigned int struct_top, offset;
+
+    offset = strtabsize + len;
+    struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+    if (fdt_totalsize(fdt) - offset < struct_top)
+        return 0; /* no more room :( */
+
+    memcpy(strtab - offset, s, len);
+    fdt_set_size_dt_strings(fdt, strtabsize + len);
+    return -offset;
+}
+
+/* Must only be used to roll back in case of error */
+static void fdt_del_last_string_(void *fdt, const char *s)
+{
+    int strtabsize = fdt_size_dt_strings(fdt);
+    int len = strlen(s) + 1;
+
+    fdt_set_size_dt_strings(fdt, strtabsize - len);
+}
+
+static int fdt_find_add_string_(void *fdt, const char *s, int *allocated)
+{
+    char *strtab = (char *)fdt + fdt_totalsize(fdt);
+    int strtabsize = fdt_size_dt_strings(fdt);
+    const char *p;
+
+    *allocated = 0;
+
+    p = fdt_find_string_(strtab - strtabsize, strtabsize, s);
+    if (p)
+        return p - strtab;
+
+    *allocated = 1;
+
+    return fdt_add_string_(fdt, s);
+}
+
+int fdt_property_placeholder(void *fdt, const char *name, int len, void **valp)
+{
+    struct fdt_property *prop;
+    int nameoff;
+    int allocated;
+
+    FDT_SW_PROBE_STRUCT(fdt);
+
+    /* String de-duplication can be slow, _NO_NAME_DEDUP skips it */
+    if (sw_flags(fdt) & FDT_CREATE_FLAG_NO_NAME_DEDUP) {
+        allocated = 1;
+        nameoff = fdt_add_string_(fdt, name);
+    } else {
+        nameoff = fdt_find_add_string_(fdt, name, &allocated);
+    }
+    if (nameoff == 0)
+        return -FDT_ERR_NOSPACE;
+
+    prop = fdt_grab_space_(fdt, sizeof(*prop) + FDT_TAGALIGN(len));
+    if (! prop) {
+        if (allocated)
+            fdt_del_last_string_(fdt, name);
+        return -FDT_ERR_NOSPACE;
+    }
+
+    prop->tag = cpu_to_fdt32(FDT_PROP);
+    prop->nameoff = cpu_to_fdt32(nameoff);
+    prop->len = cpu_to_fdt32(len);
+    *valp = prop->data;
+    return 0;
+}
+
+int fdt_property(void *fdt, const char *name, const void *val, int len)
+{
+    void *ptr;
+    int ret;
+
+    ret = fdt_property_placeholder(fdt, name, len, &ptr);
+    if (ret)
+        return ret;
+    memcpy(ptr, val, len);
+    return 0;
+}
+
+int fdt_finish(void *fdt)
+{
+    char *p = (char *)fdt;
+    fdt32_t *end;
+    int oldstroffset, newstroffset;
+    uint32_t tag;
+    int offset, nextoffset;
+
+    FDT_SW_PROBE_STRUCT(fdt);
+
+    /* Add terminator */
+    end = fdt_grab_space_(fdt, sizeof(*end));
+    if (! end)
+        return -FDT_ERR_NOSPACE;
+    *end = cpu_to_fdt32(FDT_END);
+
+    /* Relocate the string table */
+    oldstroffset = fdt_totalsize(fdt) - fdt_size_dt_strings(fdt);
+    newstroffset = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
+    memmove(p + newstroffset, p + oldstroffset, fdt_size_dt_strings(fdt));
+    fdt_set_off_dt_strings(fdt, newstroffset);
+
+    /* Walk the structure, correcting string offsets */
+    offset = 0;
+    while ((tag = fdt_next_tag(fdt, offset, &nextoffset)) != FDT_END) {
+        if (tag == FDT_PROP) {
+            struct fdt_property *prop =
+                fdt_offset_ptr_w_(fdt, offset);
+            int nameoff;
+
+            nameoff = fdt32_to_cpu(prop->nameoff);
+            nameoff += fdt_size_dt_strings(fdt);
+            prop->nameoff = cpu_to_fdt32(nameoff);
+        }
+        offset = nextoffset;
+    }
+    if (nextoffset < 0)
+        return nextoffset;
+
+    /* Finally, adjust the header */
+    fdt_set_totalsize(fdt, newstroffset + fdt_size_dt_strings(fdt));
+
+    /* And fix up fields that were keeping intermediate state. */
+    fdt_set_last_comp_version(fdt, FDT_LAST_COMPATIBLE_VERSION);
+    fdt_set_magic(fdt, FDT_MAGIC);
+
+    return 0;
+}

riscv/rtthread/components/drivers/ofw/libfdt/fdt_wip.c

@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include "libfdt_env.h"
+
+#include <fdt.h>
+#include <libfdt.h>
+
+#include "libfdt_internal.h"
+
+int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
+                    const char *name, int namelen,
+                    uint32_t idx, const void *val,
+                    int len)
+{
+    void *propval;
+    int proplen;
+
+    propval = fdt_getprop_namelen_w(fdt, nodeoffset, name, namelen,
+                    &proplen);
+    if (!propval)
+        return proplen;
+
+    if ((unsigned)proplen < (len + idx))
+        return -FDT_ERR_NOSPACE;
+
+    memcpy((char *)propval + idx, val, len);
+    return 0;
+}
+
+int fdt_setprop_inplace(void *fdt, int nodeoffset, const char *name,
+            const void *val, int len)
+{
+    const void *propval;
+    int proplen;
+
+    propval = fdt_getprop(fdt, nodeoffset, name, &proplen);
+    if (!propval)
+        return proplen;
+
+    if (proplen != len)
+        return -FDT_ERR_NOSPACE;
+
+    return fdt_setprop_inplace_namelen_partial(fdt, nodeoffset, name,
+                           strlen(name), 0,
+                           val, len);
+}
+
+static void fdt_nop_region_(void *start, int len)
+{
+    fdt32_t *p;
+
+    for (p = start; (char *)p < ((char *)start + len); p++)
+        *p = cpu_to_fdt32(FDT_NOP);
+}
+
+int fdt_nop_property(void *fdt, int nodeoffset, const char *name)
+{
+    struct fdt_property *prop;
+    int len;
+
+    prop = fdt_get_property_w(fdt, nodeoffset, name, &len);
+    if (!prop)
+        return len;
+
+    fdt_nop_region_(prop, len + sizeof(*prop));
+
+    return 0;
+}
+
+int fdt_node_end_offset_(void *fdt, int offset)
+{
+    int depth = 0;
+
+    while ((offset >= 0) && (depth >= 0))
+        offset = fdt_next_node(fdt, offset, &depth);
+
+    return offset;
+}
+
+int fdt_nop_node(void *fdt, int nodeoffset)
+{
+    int endoffset;
+
+    endoffset = fdt_node_end_offset_(fdt, nodeoffset);
+    if (endoffset < 0)
+        return endoffset;
+
+    fdt_nop_region_(fdt_offset_ptr_w(fdt, nodeoffset, 0),
+            endoffset - nodeoffset);
+    return 0;
+}

riscv/rtthread/components/drivers/ofw/libfdt/libfdt_env.h

@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
+#ifndef LIBFDT_ENV_H
+#define LIBFDT_ENV_H
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ * Copyright 2012 Kim Phillips, Freescale Semiconductor.
+ */
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+
+#ifdef __CHECKER__
+#define FDT_FORCE __attribute__((force))
+#define FDT_BITWISE __attribute__((bitwise))
+#else
+#define FDT_FORCE
+#define FDT_BITWISE
+#endif
+
+#include <rtthread.h>
+
+#define strnlen rt_strnlen
+
+typedef uint16_t FDT_BITWISE fdt16_t;
+typedef uint32_t FDT_BITWISE fdt32_t;
+typedef uint64_t FDT_BITWISE fdt64_t;
+
+#define EXTRACT_BYTE(x, n)  ((unsigned long long)((uint8_t *)&x)[n])
+#define CPU_TO_FDT16(x) ((EXTRACT_BYTE(x, 0) << 8) | EXTRACT_BYTE(x, 1))
+#define CPU_TO_FDT32(x) ((EXTRACT_BYTE(x, 0) << 24) | (EXTRACT_BYTE(x, 1) << 16) | \
+             (EXTRACT_BYTE(x, 2) << 8) | EXTRACT_BYTE(x, 3))
+#define CPU_TO_FDT64(x) ((EXTRACT_BYTE(x, 0) << 56) | (EXTRACT_BYTE(x, 1) << 48) | \
+             (EXTRACT_BYTE(x, 2) << 40) | (EXTRACT_BYTE(x, 3) << 32) | \
+             (EXTRACT_BYTE(x, 4) << 24) | (EXTRACT_BYTE(x, 5) << 16) | \
+             (EXTRACT_BYTE(x, 6) << 8) | EXTRACT_BYTE(x, 7))
+
+static inline uint16_t fdt16_to_cpu(fdt16_t x)
+{
+    return (FDT_FORCE uint16_t)CPU_TO_FDT16(x);
+}
+static inline fdt16_t cpu_to_fdt16(uint16_t x)
+{
+    return (FDT_FORCE fdt16_t)CPU_TO_FDT16(x);
+}
+
+static inline uint32_t fdt32_to_cpu(fdt32_t x)
+{
+    return (FDT_FORCE uint32_t)CPU_TO_FDT32(x);
+}
+static inline fdt32_t cpu_to_fdt32(uint32_t x)
+{
+    return (FDT_FORCE fdt32_t)CPU_TO_FDT32(x);
+}
+
+static inline uint64_t fdt64_to_cpu(fdt64_t x)
+{
+    return (FDT_FORCE uint64_t)CPU_TO_FDT64(x);
+}
+static inline fdt64_t cpu_to_fdt64(uint64_t x)
+{
+    return (FDT_FORCE fdt64_t)CPU_TO_FDT64(x);
+}
+#undef CPU_TO_FDT64
+#undef CPU_TO_FDT32
+#undef CPU_TO_FDT16
+#undef EXTRACT_BYTE
+
+#ifdef __APPLE__
+#include <AvailabilityMacros.h>
+
+/* strnlen() is not available on Mac OS < 10.7 */
+# if !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED < \
+                                         MAC_OS_X_VERSION_10_7)
+
+#define strnlen fdt_strnlen
+
+/*
+ * fdt_strnlen: returns the length of a string or max_count - which ever is
+ * smallest.
+ * Input 1 string: the string whose size is to be determined
+ * Input 2 max_count: the maximum value returned by this function
+ * Output: length of the string or max_count (the smallest of the two)
+ */
+static inline size_t fdt_strnlen(const char *string, size_t max_count)
+{
+    const char *p = memchr(string, 0, max_count);
+    return p ? p - string : max_count;
+}
+
+#endif /* !defined(MAC_OS_X_VERSION_10_7) || (MAC_OS_X_VERSION_MAX_ALLOWED <
+          MAC_OS_X_VERSION_10_7) */
+
+#endif /* __APPLE__ */
+
+#endif /* LIBFDT_ENV_H */

riscv/rtthread/components/drivers/ofw/libfdt/libfdt_internal.h

@@ -0,0 +1,192 @@
+/* SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause) */
+#ifndef LIBFDT_INTERNAL_H
+#define LIBFDT_INTERNAL_H
+/*
+ * libfdt - Flat Device Tree manipulation
+ * Copyright (C) 2006 David Gibson, IBM Corporation.
+ */
+#include <fdt.h>
+
+#define FDT_ALIGN(x, a)     (((x) + (a) - 1) & ~((a) - 1))
+#define FDT_TAGALIGN(x)     (FDT_ALIGN((x), FDT_TAGSIZE))
+
+int32_t fdt_ro_probe_(const void *fdt);
+#define FDT_RO_PROBE(fdt)                   \
+    {                           \
+        int32_t totalsize_;             \
+        if ((totalsize_ = fdt_ro_probe_(fdt)) < 0)  \
+            return totalsize_;          \
+    }
+
+int fdt_check_node_offset_(const void *fdt, int offset);
+int fdt_check_prop_offset_(const void *fdt, int offset);
+const char *fdt_find_string_(const char *strtab, int tabsize, const char *s);
+int fdt_node_end_offset_(void *fdt, int nodeoffset);
+
+static inline const void *fdt_offset_ptr_(const void *fdt, int offset)
+{
+    return (const char *)fdt + fdt_off_dt_struct(fdt) + offset;
+}
+
+static inline void *fdt_offset_ptr_w_(void *fdt, int offset)
+{
+    return (void *)(uintptr_t)fdt_offset_ptr_(fdt, offset);
+}
+
+static inline const struct fdt_reserve_entry *fdt_mem_rsv_(const void *fdt, int n)
+{
+    const struct fdt_reserve_entry *rsv_table =
+        (const struct fdt_reserve_entry *)
+        ((const char *)fdt + fdt_off_mem_rsvmap(fdt));
+
+    return rsv_table + n;
+}
+static inline struct fdt_reserve_entry *fdt_mem_rsv_w_(void *fdt, int n)
+{
+    return (void *)(uintptr_t)fdt_mem_rsv_(fdt, n);
+}
+
+/*
+ * Internal helpers to access tructural elements of the device tree
+ * blob (rather than for exaple reading integers from within property
+ * values).  We assume that we are either given a naturally aligned
+ * address for the platform or if we are not, we are on a platform
+ * where unaligned memory reads will be handled in a graceful manner.
+ * If not the external helpers fdtXX_ld() from libfdt.h can be used
+ * instead.
+ */
+static inline uint32_t fdt32_ld_(const fdt32_t *p)
+{
+    return fdt32_to_cpu(*p);
+}
+
+static inline uint64_t fdt64_ld_(const fdt64_t *p)
+{
+    return fdt64_to_cpu(*p);
+}
+
+#define FDT_SW_MAGIC        (~FDT_MAGIC)
+
+/**********************************************************************/
+/* Checking controls                                                  */
+/**********************************************************************/
+
+#ifndef FDT_ASSUME_MASK
+#define FDT_ASSUME_MASK 0
+#endif
+
+/*
+ * Defines assumptions which can be enabled. Each of these can be enabled
+ * individually. For maximum safety, don't enable any assumptions!
+ *
+ * For minimal code size and no safety, use ASSUME_PERFECT at your own risk.
+ * You should have another method of validating the device tree, such as a
+ * signature or hash check before using libfdt.
+ *
+ * For situations where security is not a concern it may be safe to enable
+ * ASSUME_SANE.
+ */
+enum {
+    /*
+     * This does essentially no checks. Only the latest device-tree
+     * version is correctly handled. Inconsistencies or errors in the device
+     * tree may cause undefined behaviour or crashes. Invalid parameters
+     * passed to libfdt may do the same.
+     *
+     * If an error occurs when modifying the tree it may leave the tree in
+     * an intermediate (but valid) state. As an example, adding a property
+     * where there is insufficient space may result in the property name
+     * being added to the string table even though the property itself is
+     * not added to the struct section.
+     *
+     * Only use this if you have a fully validated device tree with
+     * the latest supported version and wish to minimise code size.
+     */
+    ASSUME_PERFECT      = 0xff,
+
+    /*
+     * This assumes that the device tree is sane. i.e. header metadata
+     * and basic hierarchy are correct.
+     *
+     * With this assumption enabled, normal device trees produced by libfdt
+     * and the compiler should be handled safely. Malicious device trees and
+     * complete garbage may cause libfdt to behave badly or crash. Truncated
+     * device trees (e.g. those only partially loaded) can also cause
+     * problems.
+     *
+     * Note: Only checks that relate exclusively to the device tree itself
+     * (not the parameters passed to libfdt) are disabled by this
+     * assumption. This includes checking headers, tags and the like.
+     */
+    ASSUME_VALID_DTB    = 1 << 0,
+
+    /*
+     * This builds on ASSUME_VALID_DTB and further assumes that libfdt
+     * functions are called with valid parameters, i.e. not trigger
+     * FDT_ERR_BADOFFSET or offsets that are out of bounds. It disables any
+     * extensive checking of parameters and the device tree, making various
+     * assumptions about correctness.
+     *
+     * It doesn't make sense to enable this assumption unless
+     * ASSUME_VALID_DTB is also enabled.
+     */
+    ASSUME_VALID_INPUT  = 1 << 1,
+
+    /*
+     * This disables checks for device-tree version and removes all code
+     * which handles older versions.
+     *
+     * Only enable this if you know you have a device tree with the latest
+     * version.
+     */
+    ASSUME_LATEST       = 1 << 2,
+
+    /*
+     * This assumes that it is OK for a failed addition to the device tree,
+     * due to lack of space or some other problem, to skip any rollback
+     * steps (such as dropping the property name from the string table).
+     * This is safe to enable in most circumstances, even though it may
+     * leave the tree in a sub-optimal state.
+     */
+    ASSUME_NO_ROLLBACK  = 1 << 3,
+
+    /*
+     * This assumes that the device tree components appear in a 'convenient'
+     * order, i.e. the memory reservation block first, then the structure
+     * block and finally the string block.
+     *
+     * This order is not specified by the device-tree specification,
+     * but is expected by libfdt. The device-tree compiler always created
+     * device trees with this order.
+     *
+     * This assumption disables a check in fdt_open_into() and removes the
+     * ability to fix the problem there. This is safe if you know that the
+     * device tree is correctly ordered. See fdt_blocks_misordered_().
+     */
+    ASSUME_LIBFDT_ORDER = 1 << 4,
+
+    /*
+     * This assumes that libfdt itself does not have any internal bugs. It
+     * drops certain checks that should never be needed unless libfdt has an
+     * undiscovered bug.
+     *
+     * This can generally be considered safe to enable.
+     */
+    ASSUME_LIBFDT_FLAWLESS  = 1 << 5,
+};
+
+/**
+ * can_assume_() - check if a particular assumption is enabled
+ *
+ * @mask: Mask to check (ASSUME_...)
+ * @return true if that assumption is enabled, else false
+ */
+static inline bool can_assume_(int mask)
+{
+    return FDT_ASSUME_MASK & mask;
+}
+
+/** helper macros for checking assumptions */
+#define can_assume(_assume) can_assume_(ASSUME_ ## _assume)
+
+#endif /* LIBFDT_INTERNAL_H */

riscv/rtthread/components/drivers/ofw/ofw.c

@@ -0,0 +1,625 @@
+/*
+ * Copyright (c) 2006-2024, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-08-25     GuEe-GUI     first version
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <drivers/platform.h>
+#include <drivers/core/bus.h>
+#include "../serial/serial_dm.h"
+
+#define DBG_TAG "rtdm.ofw"
+#define DBG_LVL DBG_INFO
+#include <rtdbg.h>
+
+#include "ofw_internal.h"
+
+struct rt_ofw_stub *rt_ofw_stub_probe_range(struct rt_ofw_node *np,
+        const struct rt_ofw_stub *stub_start, const struct rt_ofw_stub *stub_end)
+{
+    const struct rt_ofw_stub *stub = RT_NULL;
+
+    if (np && stub_start && stub_end &&
+        !rt_ofw_node_test_flag(np, RT_OFW_F_READLY) &&
+        !rt_ofw_node_test_flag(np, RT_OFW_F_SYSTEM))
+    {
+        struct rt_ofw_prop *compat_prop = rt_ofw_get_prop(np, "compatible", RT_NULL);
+
+        if (compat_prop)
+        {
+            rt_ofw_foreach_stub(stub, stub_start, stub_end)
+            {
+                struct rt_ofw_node_id *id;
+
+                if (!stub->ids)
+                {
+                    continue;
+                }
+
+                id = rt_ofw_prop_match(compat_prop, stub->ids);
+
+                if (id)
+                {
+                    if (!stub->handler(np, id))
+                    {
+                        rt_ofw_node_set_flag(np, RT_OFW_F_READLY);
+                    }
+
+                    break;
+                }
+            }
+        }
+    }
+
+    return (struct rt_ofw_stub *)stub;
+}
+
+static const char *ofw_console_serial_find(char *dst_con, struct rt_ofw_node *np)
+{
+    rt_object_t rt_obj = RT_NULL;
+    const char *ofw_name = RT_NULL;
+    struct rt_serial_device *rt_serial = rt_ofw_data(np);
+
+    if (rt_serial)
+    {
+        rt_obj = &rt_serial->parent.parent;
+    }
+
+    /*
+     * This is a dangerous behavior because rt_data can be modified by other
+     * user. But fortunately, we can check if the rt_data is a rt_device or
+     * rt_serial_device.
+     */
+    if (rt_obj && rt_object_get_type(rt_obj) == RT_Object_Class_Device &&
+        rt_serial->parent.type == RT_Device_Class_Char)
+    {
+        ofw_name = np->full_name;
+        rt_strncpy(dst_con, rt_obj->name, RT_NAME_MAX);
+    }
+
+    return ofw_name;
+}
+
+static int tty_device_compare(rt_device_t dev, void *data)
+{
+    rt_ubase_t *args_list;
+    char *dst_con;
+    const char *console, **ofw_name;
+    const struct rt_ofw_node_id *id;
+    struct rt_platform_device *pdev;
+    int *tty_idx, tty_id, tty_name_len;
+
+    pdev = rt_container_of(dev, struct rt_platform_device, parent);
+    id = pdev->id;
+
+    args_list = data;
+    tty_idx = (int *)args_list[0];
+    tty_id = args_list[1];
+    console = (const char *)args_list[2];
+    tty_name_len = args_list[3];
+    dst_con = (char *)args_list[4];
+    ofw_name = (const char **)args_list[5];
+
+    if (id && id->type[0] && !strncmp(id->type, console, tty_name_len))
+    {
+        if (*tty_idx == tty_id)
+        {
+            *ofw_name = ofw_console_serial_find(dst_con, pdev->parent.ofw_node);
+
+            return RT_EOK;
+        }
+
+        ++*tty_idx;
+    }
+
+    return -RT_EEMPTY;
+}
+
+static const char *ofw_console_tty_find(char *dst_con, const char *con)
+{
+    const char *ofw_name = RT_NULL;
+    static rt_bus_t platform_bus = RT_NULL;
+
+    if (!platform_bus)
+    {
+        platform_bus = rt_bus_find_by_name("platform");
+    }
+
+    if (platform_bus)
+    {
+        rt_ubase_t args_list[6];
+        const char *console = con;
+        int tty_idx = 0, tty_id = 0, tty_name_len;
+
+        con += sizeof("tty") - 1;
+
+        while (*con && !(*con >= '0' && *con <= '9'))
+        {
+            ++con;
+        }
+
+        tty_name_len = con - console;
+
+        while (*con && *con >= '0' && *con <= '9')
+        {
+            tty_id *= 10;
+            tty_id += *con - '0';
+
+            ++con;
+        }
+
+        args_list[0] = (rt_ubase_t)&tty_idx;
+        args_list[1] = tty_id;
+        args_list[2] = (rt_ubase_t)console;
+        args_list[3] = tty_name_len;
+        args_list[4] = (rt_ubase_t)dst_con;
+        args_list[5] = (rt_ubase_t)&ofw_name;
+        rt_bus_for_each_dev(platform_bus, &args_list, tty_device_compare);
+    }
+
+    return ofw_name;
+}
+
+rt_err_t rt_ofw_console_setup(void)
+{
+    rt_err_t err = -RT_ENOSYS;
+    char con_name[RT_NAME_MAX], *options = RT_NULL;
+    const char *ofw_name = RT_NULL, *stdout_path, *con;
+
+    /* chosen.console > chosen.stdout-path > RT_CONSOLE_DEVICE_NAME */
+
+    con = rt_ofw_bootargs_select("console=", 0);
+
+    for (int i = 1; con; ++i)
+    {
+        if (!rt_strncmp(con, "uart", sizeof("uart") - 1))
+        {
+            rt_strncpy(con_name, con, RT_NAME_MAX);
+
+            err = RT_EOK;
+            break;
+        }
+        else if (!rt_strncmp(con, "tty", sizeof("tty") - 1))
+        {
+            ofw_name = ofw_console_tty_find(con_name, con);
+
+            if (ofw_name)
+            {
+                const char *ch = con;
+
+                while (*ch && *ch != ' ')
+                {
+                    if (*ch++ == ',')
+                    {
+                        options = (char *)ch;
+
+                        break;
+                    }
+                }
+
+                err = RT_EOK;
+                break;
+            }
+        }
+
+        con = rt_ofw_bootargs_select("console=", i);
+    }
+
+    if (err == -RT_ENOSYS && !rt_ofw_prop_read_string(ofw_node_chosen, "stdout-path", &stdout_path))
+    {
+        struct rt_ofw_node *stdout_np = rt_ofw_find_node_by_path(stdout_path);
+
+        if (stdout_np && (ofw_name = ofw_console_serial_find(con_name, stdout_np)))
+        {
+            err = RT_EOK;
+        }
+    }
+
+    if (err == -RT_ENOSYS)
+    {
+        rt_device_t serial = rt_device_find(RT_CONSOLE_DEVICE_NAME);
+
+        if (serial)
+        {
+            ofw_name = rt_ofw_node_full_name(serial->ofw_node);
+
+            con = RT_CONSOLE_DEVICE_NAME;
+        }
+        else
+        {
+            LOG_W("Console will probably fail to setup");
+        }
+    }
+    else
+    {
+        con = con_name;
+    }
+
+    rt_console_set_device(con);
+
+    if (options)
+    {
+        rt_device_t con_dev = rt_console_get_device();
+
+        if (con_dev)
+        {
+            struct serial_configure con_conf = serial_cfg_from_args(options);
+
+            rt_device_control(con_dev, RT_DEVICE_CTRL_CONFIG, &con_conf);
+        }
+    }
+
+    rt_fdt_earlycon_kick(FDT_EARLYCON_KICK_COMPLETED);
+
+    LOG_I("Console: %s (%s)", con, ofw_name ? ofw_name : "<unknown>");
+
+    return err;
+}
+
+const char *rt_ofw_bootargs_select(const char *key, int index)
+{
+    const char *value = RT_NULL;
+
+    if (key && index >= 0)
+    {
+        static char **values = RT_NULL;
+        static rt_size_t bootargs_nr = 1;
+        const char *bootargs = RT_NULL, *ch;
+
+        if (bootargs_nr && !values &&
+            (bootargs_nr = 0, !rt_ofw_prop_read_string(ofw_node_chosen, "bootargs", &bootargs)) &&
+            bootargs && (bootargs = rt_strdup(bootargs)))
+        {
+            rt_bool_t quotes = RT_TRUE;
+            rt_size_t length = rt_strlen(bootargs);
+            const char *bootargs_end = bootargs + length;
+
+            for (ch = bootargs; ch < bootargs_end; ++ch)
+            {
+                if (*ch == '"')
+                {
+                    quotes = !quotes;
+                    continue;
+                }
+
+                if (*ch != ' ' || !quotes)
+                {
+                    continue;
+                }
+
+                ++bootargs_nr;
+
+                while (*ch == ' ' && ch < bootargs_end)
+                {
+                    *(char *)ch++ = '\0';
+                }
+                --ch;
+            }
+
+            if (bootargs_nr)
+            {
+                /* last arg */
+                ++bootargs_nr;
+                values = rt_malloc(sizeof(char *) * bootargs_nr);
+            }
+
+            if (values)
+            {
+                int idx = 0;
+
+                for (int i = 0; i < length; ++i)
+                {
+                    for (; i < length && !bootargs[i]; ++i)
+                    {
+                    }
+
+                    if (i < length)
+                    {
+                        values[idx++] = (char *)&bootargs[i];
+                    }
+
+                    for (; i < length && bootargs[i]; ++i)
+                    {
+                    }
+                }
+            }
+            else
+            {
+                rt_free((char *)bootargs);
+            }
+        }
+
+        if (values)
+        {
+            int keylen = rt_strlen(key);
+
+            for (int idx = 0, count = 0; idx < bootargs_nr; ++idx)
+            {
+                if (!rt_strncmp(values[idx], key, keylen))
+                {
+                    if (count == index)
+                    {
+                        value = values[idx] + keylen;
+
+                        break;
+                    }
+
+                    ++count;
+                }
+            }
+        }
+    }
+
+    return value;
+}
+
+#ifdef RT_USING_CONSOLE
+static void dts_put_depth(int depth)
+{
+    while (depth --> 0)
+    {
+        rt_kputs("    ");
+    }
+}
+
+static rt_bool_t dts_test_string_list(const void *value, int size)
+{
+    const char *str, *str_start, *str_end;
+
+    if (!size)
+    {
+        return RT_FALSE;
+    }
+
+    str = value;
+
+    /* String end with '\0' */
+    if (str[size - 1] != '\0')
+    {
+        return RT_FALSE;
+    }
+
+    /* Get string list end */
+    str_end = str + size;
+
+    while (str < str_end)
+    {
+        str_start = str;
+        /* Before string list end, not '\0' and a printable characters */
+        while (str < str_end && *str && ((unsigned char)*str >= ' ' && (unsigned char)*str <= '~'))
+        {
+            ++str;
+        }
+
+        /* Not zero, or not increased */
+        if (*str != '\0' || str == str_start)
+        {
+            return RT_FALSE;
+        }
+
+        /* Next string */
+        ++str;
+    }
+
+    return RT_TRUE;
+}
+
+static void ofw_node_dump_dts(struct rt_ofw_node *np, rt_bool_t sibling_too)
+{
+    int depth = 0;
+    struct rt_ofw_prop *prop;
+    struct rt_ofw_node *org_np = np;
+
+    while (np)
+    {
+        dts_put_depth(depth);
+        rt_kputs(np->full_name);
+        rt_kputs(" {\n");
+
+        prop = np->props;
+
+        /* Print prop start */
+        ++depth;
+
+        while (prop)
+        {
+            dts_put_depth(depth);
+
+            rt_kputs(prop->name);
+
+            /* Have value? */
+            if (prop->length > 0)
+            {
+                int length = prop->length;
+                void *value = prop->value;
+
+                rt_kputs(" = ");
+
+                if (dts_test_string_list(value, length))
+                {
+                    /* String list */
+                    char *str = value;
+
+                    do {
+                        rt_kputs("\"");
+                        rt_kputs(str);
+                        rt_kputs("\", ");
+
+                        str += rt_strlen(str) + 1;
+
+                    } while (str < (char *)value + length);
+
+                    rt_kputs("\b\b");
+                }
+                else if ((length % 4) == 0)
+                {
+                    /* u32 data in <?> */
+                    fdt32_t *cell = value;
+
+                    rt_kputs("<");
+
+                    length /= 4;
+
+                    for (int i = 0; i < length; ++i)
+                    {
+                        rt_kprintf("0x%02x ", fdt32_to_cpu(cell[i]));
+                    }
+
+                    rt_kputs("\b>");
+                }
+                else
+                {
+                    /* Byte data in [?] */
+                    rt_uint8_t *byte = value;
+
+                    rt_kputs("[");
+
+                    for (int i = 0; i < length; ++i)
+                    {
+                       rt_kprintf("%02x ", *byte++);
+                    }
+
+                    rt_kputs("\b]");
+                }
+            }
+
+            rt_kputs(";\n");
+
+            prop = prop->next;
+        }
+
+        --depth;
+        /* Print prop end */
+
+        if (np->child)
+        {
+            rt_kputs("\n");
+            np = np->child;
+            ++depth;
+        }
+        else
+        {
+            dts_put_depth(depth);
+            rt_kputs("};\n");
+
+            if (!sibling_too && org_np == np)
+            {
+                break;
+            }
+
+            while (np->parent && !np->sibling)
+            {
+                np = np->parent;
+                --depth;
+
+                if (depth >= 0)
+                {
+                    dts_put_depth(depth);
+                    rt_kputs("};\n");
+                }
+            }
+
+            if (!sibling_too && org_np == np)
+            {
+                break;
+            }
+
+            np = np->sibling;
+
+            if (np)
+            {
+                rt_kputs("\n");
+            }
+        }
+    }
+}
+
+void rt_ofw_node_dump_dts(struct rt_ofw_node *np, rt_bool_t sibling_too)
+{
+    if (np)
+    {
+        if (!rt_strcmp(np->name, "/"))
+        {
+            struct fdt_info *header = (struct fdt_info *)np->name;
+            struct fdt_reserve_entry *rsvmap = header->rsvmap;
+
+            rt_kprintf("/dts-v%x/;\n\n", fdt_version(header->fdt));
+
+            for (int i = header->rsvmap_nr - 1; i >= 0; --i)
+            {
+                rt_kprintf("/memreserve/\t%p %p;\n",
+                        ofw_static_cast(rt_size_t, fdt64_to_cpu(rsvmap->address)),
+                        ofw_static_cast(rt_size_t, fdt64_to_cpu(rsvmap->size)));
+
+                ++rsvmap;
+            }
+
+            rt_kputs(np->name);
+        }
+
+        ofw_node_dump_dts(np, sibling_too);
+    }
+}
+
+#ifdef RT_USING_MSH
+static void ofw_dts(int argc, char**argv)
+{
+    if (ofw_node_root)
+    {
+        if (argc == 1)
+        {
+            rt_ofw_node_dump_dts(ofw_node_root, RT_TRUE);
+        }
+        else if (argv[1][0] == '/')
+        {
+            struct rt_ofw_node *np = rt_ofw_find_node_by_path(argv[1]);
+
+            if (np)
+            {
+                rt_ofw_node_dump_dts(np, RT_FALSE);
+            }
+            else
+            {
+                rt_kprintf("%s not found.\n", argv[1]);
+            }
+        }
+        else if (argc >= 2 && !rt_strcmp(argv[1], "list") && argv[2][0] == '/')
+        {
+            struct rt_ofw_node *np = rt_ofw_find_node_by_path(argv[2]);
+
+            if (np)
+            {
+                const char *split = np == ofw_node_root ? "" : "/";
+
+                np = np->child;
+
+                while (np)
+                {
+                    rt_kprintf("%s%s%s\n", argv[2], split, np->full_name);
+                    np = np->sibling;
+                }
+            }
+            else
+            {
+                rt_kprintf("%s not found.\n", argv[2]);
+            }
+        }
+        else
+        {
+            rt_kprintf("Usage: %s {list} {path}\n", __func__);
+        }
+    }
+    else
+    {
+        rt_kprintf("\"/\" path not found.");
+    }
+}
+MSH_CMD_EXPORT(ofw_dts, dump the dts or node for this platform);
+#endif /* RT_USING_MSH */
+#endif /* RT_USING_CONSOLE */

riscv/rtthread/components/drivers/ofw/ofw_internal.h

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-08-25     GuEe-GUI     first version
+ */
+
+#ifndef __OFW_INTERNAL_H__
+#define __OFW_INTERNAL_H__
+
+#include <rtthread.h>
+#include <posix/string.h>
+#include <drivers/ofw.h>
+
+#define OFW_PHANDLE_MIN     1
+#define OFW_PHANDLE_MAX     FDT_MAX_PHANDLE
+
+#define OFW_NODE_MAX_DEPTH  64
+#define OFW_NODE_MIN_HASH   128
+
+#define OFW_ROOT_NODE_ADDR_CELLS_DEFAULT    1
+#define OFW_ROOT_NODE_SIZE_CELLS_DEFAULT    1
+struct fdt_info
+{
+    /* Always "/", because we save "ofw" information in root node. */
+    char name[sizeof("/")];
+
+    /* Information start */
+    void *fdt;
+
+    /* Only root can use */
+    struct fdt_reserve_entry *rsvmap;
+    rt_size_t rsvmap_nr;
+};
+
+struct alias_info
+{
+    rt_list_t list;
+
+    int id;
+    const char *tag;
+    rt_size_t tag_len;
+
+    struct rt_ofw_node *np;
+};
+
+struct bus_ranges
+{
+    rt_size_t nr;
+
+    rt_uint64_t *child_addr;
+    rt_uint64_t *parent_addr;
+    rt_uint64_t *child_size;
+};
+
+extern struct rt_ofw_node *ofw_node_root;
+extern struct rt_ofw_node *ofw_node_cpus;
+extern struct rt_ofw_node *ofw_node_chosen;
+extern struct rt_ofw_node *ofw_node_aliases;
+extern struct rt_ofw_node *ofw_node_reserved_memory;
+
+extern struct rt_fdt_earlycon fdt_earlycon;
+
+#define ofw_static_cast(to_type, value) \
+    (to_type)(((value) >> ((sizeof(value) - sizeof(to_type)) * 8)))
+
+rt_err_t ofw_alias_scan(void);
+int ofw_alias_node_id(struct rt_ofw_node *np);
+rt_err_t ofw_phandle_hash_reset(rt_phandle min, rt_phandle max);
+
+#endif /* __OFW_INTERNAL_H__ */

riscv/rtthread/components/drivers/ofw/raw.c

@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2022-10-19     GuEe-GUI     first version
+ */
+
+#include <drivers/ofw_raw.h>
+
+int fdt_add_subnode_possible(void *fdt, int parentoffset, const char *name)
+{
+    int nodeoffset;
+
+    if ((nodeoffset = fdt_add_subnode(fdt, parentoffset, name)) < 0)
+    {
+        fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + FDT_PADDING_SIZE);
+        nodeoffset = fdt_add_subnode(fdt, parentoffset, name);
+    }
+
+    return nodeoffset;
+}
+
+int fdt_add_mem_rsv_possible(void *fdt, size_t addr, size_t size)
+{
+    int err = 0;
+
+    if (fdt_add_mem_rsv(fdt, addr, size) < 0)
+    {
+        fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + FDT_PADDING_SIZE);
+        err = fdt_add_mem_rsv(fdt, addr, size);
+    }
+
+    return err;
+}
+
+int fdt_setprop_uxx(void *fdt, int nodeoffset, const char *name, uint64_t val, bool is_u64)
+{
+    int err;
+
+    if (is_u64)
+    {
+        err = fdt_setprop_u64(fdt, nodeoffset, name, val);
+    }
+    else
+    {
+        err = fdt_setprop_u32(fdt, nodeoffset, name, (uint32_t)val);
+    }
+
+    return err;
+}
+
+#define FDT_RAW_GET_VAL_FLAG(std_type, s, sz)                   \
+int fdt_getprop_##std_type##sz(void *fdt, int nodeoffset,       \
+        const char *name, s##int##sz##_t *out_value, int *lenp) \
+{                                                               \
+    int err = -FDT_ERR_NOTFOUND;                                \
+    if (fdt && nodeoffset >= 0 && name && out_value)            \
+    {                                                           \
+        const fdt##sz##_t *ptr;                                 \
+        if ((ptr = fdt_getprop(fdt, nodeoffset, name, lenp)))   \
+        {                                                       \
+            *out_value = fdt##sz##_to_cpu(*ptr);                \
+            err = 0;                                            \
+        }                                                       \
+    }                                                           \
+    return err;                                                 \
+}
+
+#define FDT_RAW_GET_VAL(size) \
+    FDT_RAW_GET_VAL_FLAG(u, u, size) \
+    FDT_RAW_GET_VAL_FLAG(s,  , size)
+
+FDT_RAW_GET_VAL(64)
+FDT_RAW_GET_VAL(32)
+FDT_RAW_GET_VAL(16)
+FDT_RAW_GET_VAL(8)
+
+#undef FDT_RAW_GET_VAL
+#undef FDT_RAW_GET_VAL_FLAG
+
+int fdt_io_addr_cells(void *fdt, int nodeoffset)
+{
+    int cells = -1;
+    int parentoffset = fdt_parent_offset(fdt, nodeoffset);
+
+    for (; parentoffset >= 0 ; parentoffset = fdt_parent_offset(fdt, parentoffset))
+    {
+        const fdt32_t *cells_tmp = fdt_getprop(fdt, parentoffset, "#address-cells", NULL);
+
+        if (cells_tmp)
+        {
+            cells = fdt32_to_cpu(*cells_tmp);
+        }
+    }
+
+    if (cells < 0)
+    {
+        cells = fdt_address_cells(fdt, nodeoffset);
+    }
+
+    return cells;
+}
+
+int fdt_io_size_cells(void *fdt, int nodeoffset)
+{
+    int cells = -1;
+    int parentoffset = fdt_parent_offset(fdt, nodeoffset);
+
+    for (; parentoffset >= 0 ; parentoffset = fdt_parent_offset(fdt, parentoffset))
+    {
+        const fdt32_t *cells_tmp = fdt_getprop(fdt, parentoffset, "#size-cells", NULL);
+
+        if (cells_tmp)
+        {
+            cells = fdt32_to_cpu(*cells_tmp);
+        }
+    }
+
+    if (cells < 0)
+    {
+        cells = fdt_size_cells(fdt, nodeoffset);
+    }
+
+    return cells;
+}
+
+int fdt_install_initrd(void *fdt, char *os_name, size_t initrd_addr, size_t initrd_size)
+{
+    int err = -FDT_ERR_NOTFOUND;
+    int chosen_offset = -1, root_off = fdt_path_offset(fdt, "/");
+
+    if (root_off >= 0)
+    {
+        chosen_offset = fdt_subnode_offset(fdt, root_off, "chosen");
+
+        if (chosen_offset == -FDT_ERR_NOTFOUND)
+        {
+            chosen_offset = fdt_add_subnode_possible(fdt, root_off, "chosen");
+        }
+    }
+
+    if (chosen_offset >= 0)
+    {
+        uint64_t addr, size;
+
+        err = 0;
+
+        /* Update the entry */
+        for (int i = fdt_num_mem_rsv(fdt) - 1; i >= 0; --i)
+        {
+            fdt_get_mem_rsv(fdt, i, &addr, &size);
+
+            if (addr == initrd_addr)
+            {
+                fdt_del_mem_rsv(fdt, i);
+                break;
+            }
+        }
+
+        /* Add the memory */
+        if (fdt_add_mem_rsv(fdt, initrd_addr, initrd_size) < 0)
+        {
+            /* Move the memory */
+            fdt_open_into(fdt, fdt, fdt_totalsize(fdt) + FDT_PADDING_SIZE);
+
+            if (fdt_add_mem_rsv(fdt, initrd_addr, initrd_size) < 0)
+            {
+                err = -FDT_ERR_NOSPACE;
+            }
+        }
+
+        if (!err)
+        {
+            size_t name_len;
+            char initrd_name[64];
+            bool is_u64 = (fdt_io_addr_cells(fdt, root_off) == 2);
+
+            if (!os_name)
+            {
+                os_name = "rt-thread";
+            }
+
+            name_len = strlen(initrd_name);
+
+            strncpy(&initrd_name[name_len], ",initrd-start", sizeof(initrd_name) - name_len);
+            fdt_setprop_uxx(fdt, chosen_offset, initrd_name, initrd_addr, is_u64);
+
+            strncpy(&initrd_name[name_len], ",initrd-end", sizeof(initrd_name) - name_len);
+            fdt_setprop_uxx(fdt, chosen_offset, initrd_name, initrd_addr + initrd_size, is_u64);
+        }
+    }
+
+    return err;
+}