arch/sh/kernel/sh_bios.c

   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_ETH_NODE_ADDR         10
  13 #define BIOS_CALL_SHUTDOWN              11
  14 #define BIOS_CALL_CHAR_OUT              0x1f    /* TODO: hack */
  15 #define BIOS_CALL_GDB_DETACH            0xff
  16
  17 static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
  18                                     long arg3)
  19 {
  20         register long r0 __asm__("r0") = func;
  21         register long r4 __asm__("r4") = arg0;
  22         register long r5 __asm__("r5") = arg1;
  23         register long r6 __asm__("r6") = arg2;
  24         register long r7 __asm__("r7") = arg3;
  25
  26         __asm__ __volatile__("trapa     #0x3f":"=z"(r0)
  27                              :"0"(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7)
  28                              :"memory");
  29         return r0;
  30 }
  31
  32 void sh_bios_console_write(const char *buf, unsigned int len)
  33 {
  34         sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
  35 }
  36
  37 void sh_bios_char_out(char ch)
  38 {
  39         sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
  40 }
  41
  42 void sh_bios_gdb_detach(void)
  43 {
  44         sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
  45 }
  46 EXPORT_SYMBOL_GPL(sh_bios_gdb_detach);
  47
  48 void sh_bios_get_node_addr(unsigned char *node_addr)
  49 {
  50         sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
  51 }
  52 EXPORT_SYMBOL_GPL(sh_bios_get_node_addr);
  53
  54 void sh_bios_shutdown(unsigned int how)
  55 {
  56         sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
  57 }