Draft: lab 5 failed

kernel/include/syscall.h

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <stddef.h>
+#include <process.h>
+
+void syscall_handler(trapframe_t *regs);
+
+int32_t sys_getpid(void);
+size_t sys_uart_read(char buf[], size_t size);
+size_t sys_uart_write(const char buf[], size_t size);
+int32_t sys_exec(const char *name, char *const argv[]);
+int32_t sys_fork(void);
+void sys_exit(int32_t status);
+int32_t sys_mbox_call(uint8_t ch, uint32_t *mbox);
+void sys_kill(int32_t pid);