添加rtthread相关代码

riscv/rtthread/libcpu/risc-v/common/cpuport.h

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+/*
+ * Copyright (c) 2006-2023, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-10-03     Bernard      The first version
+ * 2020/11/20     BalanceTWK   Add FPU support
+ * 2023/01/04     WangShun     Adapt to CH32
+ * 2023/08/11     HPMicro      Define ARCH_RISCV_FPU if FPU is enabled
+ */
+
+#ifndef CPUPORT_H__
+#define CPUPORT_H__
+
+#include <rtconfig.h>
+
+#ifndef __ASSEMBLY__
+#ifdef RT_USING_SMP
+typedef union {
+    unsigned long slock;
+    struct __arch_tickets {
+        unsigned short owner;
+        unsigned short next;
+    } tickets;
+} rt_hw_spinlock_t;
+#endif
+#endif
+
+/* Preprocessor Definition */
+#if __riscv_flen == 32
+#define ARCH_RISCV_FPU
+#define ARCH_RISCV_FPU_S
+#endif
+
+#if __riscv_flen == 64
+#define ARCH_RISCV_FPU
+#define ARCH_RISCV_FPU_D
+#endif
+
+/* bytes of register width  */
+#ifdef ARCH_CPU_64BIT
+#define STORE                   sd
+#define LOAD                    ld
+#define REGBYTES                8
+#else
+#define STORE                   sw
+#define LOAD                    lw
+#define REGBYTES                4
+#endif
+
+/* Preprocessor Definition */
+#ifdef ARCH_RISCV_FPU
+#ifdef ARCH_RISCV_FPU_D
+#define FSTORE                  fsd
+#define FLOAD                   fld
+#define FREGBYTES               8
+#define rv_floatreg_t           rt_int64_t
+#endif
+#ifdef ARCH_RISCV_FPU_S
+#define FSTORE                  fsw
+#define FLOAD                   flw
+#define FREGBYTES               4
+#define rv_floatreg_t           rt_int32_t
+#endif
+#endif
+
+#endif