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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_ETH_NODE_ADDR 10
#define BIOS_CALL_SHUTDOWN 11
#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
#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_gdb_detach(void)
{
sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
}
EXPORT_SYMBOL_GPL(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);
}
EXPORT_SYMBOL_GPL(sh_bios_get_node_addr);
void sh_bios_shutdown(unsigned int how)
{
sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
}
void *gdb_vbr_vector = NULL;
/*
* Read the old value of the VBR register to initialise the vector
* through which debug and BIOS traps are delegated by the Linux trap
* handler.
*/
void sh_bios_vbr_init(void)
{
unsigned long vbr;
if (unlikely(gdb_vbr_vector))
return;
__asm__ __volatile__ ("stc vbr, %0" : "=r" (vbr));
gdb_vbr_vector = (void *)(vbr + 0x100);
printk(KERN_NOTICE "Setting GDB trap vector to %p\n", gdb_vbr_vector);
}
/**
* sh_bios_vbr_reload - Re-load the system VBR from the BIOS vector.
*
* This can be used by save/restore code to reinitialize the system VBR
* from the fixed BIOS VBR. A no-op if no BIOS VBR is known.
*/
void sh_bios_vbr_reload(void)
{
if (gdb_vbr_vector)
__asm__ __volatile__ (
"ldc %0, vbr"
:
: "r" (((unsigned long) gdb_vbr_vector) - 0x100)
: "memory"
);
}
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