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sh_bios.c

/*
 *  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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