sh_bios.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:2k
- /* $Id: sh_bios.c,v 1.5 2001/01/08 08:42:32 gniibe Exp $
- *
- * linux/arch/sh/kernel/sh_bios.c
- * C interface for trapping into the standard LinuxSH BIOS.
- *
- * Copyright (C) 2000 Greg Banks, Mitch Davis
- *
- */
- #include <asm/sh_bios.h>
- #define BIOS_CALL_CONSOLE_WRITE 0
- #define BIOS_CALL_READ_BLOCK 1
- #define BIOS_CALL_ETH_NODE_ADDR 10
- #define BIOS_CALL_SHUTDOWN 11
- #define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
- #define BIOS_CALL_GDB_GET_MODE_PTR 0xfe
- #define BIOS_CALL_GDB_DETACH 0xff
- static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
- {
- register long r0 __asm__("r0") = func;
- register long r4 __asm__("r4") = arg0;
- register long r5 __asm__("r5") = arg1;
- register long r6 __asm__("r6") = arg2;
- register long r7 __asm__("r7") = arg3;
- __asm__ __volatile__("trapa #0x3f"
- : "=z" (r0)
- : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
- : "memory");
- return r0;
- }
- void sh_bios_console_write(const char *buf, unsigned int len)
- {
- sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
- }
- void sh_bios_char_out(char ch)
- {
- sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
- }
- int sh_bios_in_gdb_mode(void)
- {
- static char queried = 0;
- static char *gdb_mode_p = 0;
- if (!queried)
- {
- /* Query the gdb stub for address of its gdb mode variable */
- long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
- if (r != ~0) /* BIOS returns -1 for unknown function */
- gdb_mode_p = (char *)r;
- queried = 1;
- }
- return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
- }
- void sh_bios_gdb_detach(void)
- {
- sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
- }
- void sh_bios_get_node_addr (unsigned char *node_addr)
- {
- sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
- }
- void sh_bios_shutdown(unsigned int how)
- {
- sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
- }