LXR linux/arch/sh/kernel/sh

   1/*
   2 *  linux/arch/sh/kernel/sh_bios.c
   3 *  C interface for trapping into the standard LinuxSH BIOS.
   4 *
   5 *  Copyright (C) 2000 Greg Banks, Mitch Davis
   6 *
   7 */
   8#include <linux/module.h>
   9#include <asm/sh_bios.h>
  10
  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
  18
  19static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3)
  20{
  21    register long r0 __asm__("r0") = func;
  22    register long r4 __asm__("r4") = arg0;
  23    register long r5 __asm__("r5") = arg1;
  24    register long r6 __asm__("r6") = arg2;
  25    register long r7 __asm__("r7") = arg3;
  26    __asm__ __volatile__("trapa #0x3f"
  27         : "=z" (r0)
  28         : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7)
  29         : "memory");
  30    return r0;
  31}
  32
  33
  34void sh_bios_console_write(const char *buf, unsigned int len)
  35{
  36    sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
  37}
  38
  39
  40void sh_bios_char_out(char ch)
  41{
  42    sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
  43}
  44
  45
  46int sh_bios_in_gdb_mode(void)
  47{
  48    static char queried = 0;
  49    static char *gdb_mode_p = 0;
  50
  51    if (!queried)
  52    {
  53        /* Query the gdb stub for address of its gdb mode variable */
  54        long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
  55        if (r != ~0)    /* BIOS returns -1 for unknown function */
  56            gdb_mode_p = (char *)r;
  57        queried = 1;
  58    }
  59    return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
  60}
  61
  62void sh_bios_gdb_detach(void)
  63{
  64    sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
  65}
  66EXPORT_SYMBOL(sh_bios_gdb_detach);
  67
  68void sh_bios_get_node_addr (unsigned char *node_addr)
  69{
  70    sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
  71}
  72
  73void sh_bios_shutdown(unsigned int how)
  74{
  75    sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
  76}
  77