1 /* $Id: sh_bios.c,v 1.5 2001/01/08 08:42:32 gniibe 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
sh_bios_call(long func,long arg0,long arg1,long arg2,long arg3)20 static __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
sh_bios_console_write(const char * buf,unsigned int len)35 void 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
sh_bios_char_out(char ch)41 void sh_bios_char_out(char ch)
42 {
43 sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
44 }
45
46
sh_bios_in_gdb_mode(void)47 int 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
sh_bios_gdb_detach(void)63 void sh_bios_gdb_detach(void)
64 {
65 sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
66 }
67
sh_bios_get_node_addr(unsigned char * node_addr)68 void 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
sh_bios_shutdown(unsigned int how)73 void sh_bios_shutdown(unsigned int how)
74 {
75 sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
76 }
77