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/* $Id$
*
* linux/arch/sh/kernel/sh_bios.c
* C interface for trapping into the standard LinuxSH BIOS.
*
* Copyright (C) 2000 Greg Banks, Mitch Davis
*
*/
#include <linux/config.h>
#include <asm/sh_bios.h>
#ifdef CONFIG_SH_STANDARD_BIOS
#define BIOS_CALL_CONSOLE_WRITE 0
#define BIOS_CALL_READ_BLOCK 1 /* not implemented */
#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
#define BIOS_CALL_GDB_GET_MODE_PTR 0xfe
#define BIOS_CALL_GDB_DETACH 0xff
static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
{
register long r0 __asm__("$r0") = func;
register long r4 __asm__("$r4") = arg0;
register long r5 __asm__("$r5") = arg1;
register long r6 __asm__("$r6") = arg2;
register long r7 __asm__("$r7") = arg3;
__asm__ __volatile__("trapa #0x3f"
: "=z" (r0)
: "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
: "memory");
return r0;
}
void sh_bios_console_write(const char *buf, unsigned int len)
{
sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
}
void sh_bios_char_out(char ch)
{
sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
}
int sh_bios_in_gdb_mode(void)
{
static char queried = 0;
static char *gdb_mode_p = 0;
if (!queried)
{
/* Query the gdb stub for address of its gdb mode variable */
long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
if (r != ~0) /* BIOS returns -1 for unknown function */
gdb_mode_p = (char *)r;
queried = 1;
}
return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
}
void sh_bios_gdb_detach(void)
{
sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
}
#endif
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