2 * linux/arch/sh/kernel/sh_bios.c
3 * C interface for trapping into the standard LinuxSH BIOS.
5 * Copyright (C) 2000 Greg Banks, Mitch Davis
8 #include <linux/module.h>
9 #include <asm/sh_bios.h>
11 #define BIOS_CALL_CONSOLE_WRITE 0
12 #define BIOS_CALL_READ_BLOCK 1
13 #define BIOS_CALL_ETH_NODE_ADDR 10
14 #define BIOS_CALL_SHUTDOWN 11
15 #define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
16 #define BIOS_CALL_GDB_GET_MODE_PTR 0xfe
17 #define BIOS_CALL_GDB_DETACH 0xff
19 static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
21 register long r0 __asm__("r0") = func;
22 register long r4 __asm__("r4") = arg0;
23 register long r5 __asm__("r5") = arg1;
24 register long r6 __asm__("r6") = arg2;
25 register long r7 __asm__("r7") = arg3;
26 __asm__ __volatile__("trapa #0x3f"
28 : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
34 void sh_bios_console_write(const char *buf, unsigned int len)
36 sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
40 void sh_bios_char_out(char ch)
42 sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
46 int sh_bios_in_gdb_mode(void)
48 static char queried = 0;
49 static char *gdb_mode_p = 0;
53 /* Query the gdb stub for address of its gdb mode variable */
54 long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
55 if (r != ~0) /* BIOS returns -1 for unknown function */
56 gdb_mode_p = (char *)r;
59 return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
62 void sh_bios_gdb_detach(void)
64 sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
66 EXPORT_SYMBOL(sh_bios_gdb_detach);
68 void sh_bios_get_node_addr (unsigned char *node_addr)
70 sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
73 void sh_bios_shutdown(unsigned int how)
75 sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);