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
,
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
;
28 __asm__
__volatile__("trapa #0x3f":"=z"(r0
)
29 :"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);
39 void sh_bios_char_out(char ch
)
41 sh_bios_call(BIOS_CALL_CHAR_OUT
, ch
, 0, 0, 0);
44 int sh_bios_in_gdb_mode(void)
46 static char queried
= 0;
47 static char *gdb_mode_p
= 0;
50 /* Query the gdb stub for address of its gdb mode variable */
51 long r
= sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR
, 0, 0, 0, 0);
52 if (r
!= ~0) /* BIOS returns -1 for unknown function */
53 gdb_mode_p
= (char *)r
;
56 return (gdb_mode_p
!= 0 ? *gdb_mode_p
: 0);
59 void sh_bios_gdb_detach(void)
61 sh_bios_call(BIOS_CALL_GDB_DETACH
, 0, 0, 0, 0);
64 EXPORT_SYMBOL(sh_bios_gdb_detach
);
66 void sh_bios_get_node_addr(unsigned char *node_addr
)
68 sh_bios_call(BIOS_CALL_ETH_NODE_ADDR
, 0, (long)node_addr
, 0, 0);
71 void sh_bios_shutdown(unsigned int how
)
73 sh_bios_call(BIOS_CALL_SHUTDOWN
, how
, 0, 0, 0);