diff options
Diffstat (limited to 'arch/sh/kernel/sh_bios.c')
-rw-r--r-- | arch/sh/kernel/sh_bios.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/arch/sh/kernel/sh_bios.c b/arch/sh/kernel/sh_bios.c new file mode 100644 index 000000000000..5b53e10bb9cd --- /dev/null +++ b/arch/sh/kernel/sh_bios.c | |||
@@ -0,0 +1,75 @@ | |||
1 | /* | ||
2 | * linux/arch/sh/kernel/sh_bios.c | ||
3 | * C interface for trapping into the standard LinuxSH BIOS. | ||
4 | * | ||
5 | * Copyright (C) 2000 Greg Banks, Mitch Davis | ||
6 | * | ||
7 | */ | ||
8 | |||
9 | #include <asm/sh_bios.h> | ||
10 | |||
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 | ||
18 | |||
19 | static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3) | ||
20 | { | ||
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" | ||
27 | : "=z" (r0) | ||
28 | : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7) | ||
29 | : "memory"); | ||
30 | return r0; | ||
31 | } | ||
32 | |||
33 | |||
34 | void sh_bios_console_write(const char *buf, unsigned int len) | ||
35 | { | ||
36 | sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0); | ||
37 | } | ||
38 | |||
39 | |||
40 | void sh_bios_char_out(char ch) | ||
41 | { | ||
42 | sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0); | ||
43 | } | ||
44 | |||
45 | |||
46 | int sh_bios_in_gdb_mode(void) | ||
47 | { | ||
48 | static char queried = 0; | ||
49 | static char *gdb_mode_p = 0; | ||
50 | |||
51 | if (!queried) | ||
52 | { | ||
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; | ||
57 | queried = 1; | ||
58 | } | ||
59 | return (gdb_mode_p != 0 ? *gdb_mode_p : 0); | ||
60 | } | ||
61 | |||
62 | void sh_bios_gdb_detach(void) | ||
63 | { | ||
64 | sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0); | ||
65 | } | ||
66 | |||
67 | void sh_bios_get_node_addr (unsigned char *node_addr) | ||
68 | { | ||
69 | sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0); | ||
70 | } | ||
71 | |||
72 | void sh_bios_shutdown(unsigned int how) | ||
73 | { | ||
74 | sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0); | ||
75 | } | ||