添加rtthread相关代码

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 */