1/* $Id: sh_bios.c,v 1.1.1.1 2008/10/15 03:26:18 james26_jang Exp $
2 *
3 *  linux/arch/sh/kernel/sh_bios.c
4 *  C interface for trapping into the standard LinuxSH BIOS.
5 *
6 *  Copyright (C) 2000 Greg Banks, Mitch Davis
7 *
8 */
9
10#include <asm/sh_bios.h>
11
12#define BIOS_CALL_CONSOLE_WRITE     	0
13#define BIOS_CALL_READ_BLOCK     	1
14#define BIOS_CALL_ETH_NODE_ADDR		10
15#define BIOS_CALL_SHUTDOWN		11
16#define BIOS_CALL_CHAR_OUT     	    	0x1f  	/* TODO: hack */
17#define BIOS_CALL_GDB_GET_MODE_PTR     	0xfe
18#define BIOS_CALL_GDB_DETACH     	0xff
19
20static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
21{
22    register long r0 __asm__("r0") = func;
23    register long r4 __asm__("r4") = arg0;
24    register long r5 __asm__("r5") = arg1;
25    register long r6 __asm__("r6") = arg2;
26    register long r7 __asm__("r7") = arg3;
27    __asm__ __volatile__("trapa	#0x3f"
28	 : "=z" (r0)
29	 : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
30	 : "memory");
31    return r0;
32}
33
34
35void sh_bios_console_write(const char *buf, unsigned int len)
36{
37    sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
38}
39
40
41void sh_bios_char_out(char ch)
42{
43    sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
44}
45
46
47int sh_bios_in_gdb_mode(void)
48{
49    static char queried = 0;
50    static char *gdb_mode_p = 0;
51
52    if (!queried)
53    {
54    	/* Query the gdb stub for address of its gdb mode variable */
55    	long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
56	if (r != ~0)	/* BIOS returns -1 for unknown function */
57	    gdb_mode_p = (char *)r;
58	queried = 1;
59    }
60    return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
61}
62
63void sh_bios_gdb_detach(void)
64{
65    sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
66}
67
68void sh_bios_get_node_addr (unsigned char *node_addr)
69{
70    sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
71}
72
73void sh_bios_shutdown(unsigned int how)
74{
75    sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
76}
77