创建，添加sdram

rt-thread/components/lwp/arch/x86/i386/lwp_arch.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2021-07-18     JasonHu      first version
+ */
+
+#ifndef  LWP_ARCH_H__
+#define  LWP_ARCH_H__
+
+#include <lwp.h>
+#include <lwp_arch_comm.h>
+#include <stackframe.h>
+
+#ifdef ARCH_MM_MMU
+#define USER_VADDR_TOP    0xFFFFF000UL
+#define USER_HEAP_VEND    0xE0000000UL
+#define USER_HEAP_VADDR   0x90000000UL
+#define USER_STACK_VSTART 0x80000000UL
+#define USER_STACK_VEND   USER_HEAP_VADDR
+#define LDSO_LOAD_VADDR   0x70000000UL
+#define USER_VADDR_START  0x40000000UL
+#define USER_LOAD_VADDR   USER_VADDR_START
+
+#define SIGNAL_RETURN_SYSCAL_ID    0xe000
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+rt_thread_t rt_thread_sp_to_thread(void *spmember_addr);
+
+void lwp_signal_do_return(rt_hw_stack_frame_t *frame);
+
+rt_inline unsigned long rt_hw_ffz(unsigned long x)
+{
+    return __builtin_ffsl(~x) - 1;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* ARCH_MM_MMU */
+
+#endif  /*LWP_ARCH_H__*/