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/*
* 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/module.h>
#include <asm/sh_bios.h>
#define BIOS_CALL_CONSOLE_WRITE 0
#define BIOS_CALL_READ_BLOCK 1
#define BIOS_CALL_ETH_NODE_ADDR 10
#define BIOS_CALL_SHUTDOWN 11
#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);
}
EXPORT_SYMBOL(sh_bios_gdb_detach);
void sh_bios_get_node_addr(unsigned char *node_addr)
{
sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
}
void sh_bios_shutdown(unsigned int how)
{
sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
}
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