1/* $Id: sh_bios.c,v 1.1.1.1 2008/10/15 03:26:18 james26_jang Exp $ 2 * 3 * linux/arch/sh/kernel/sh_bios.c 4 * C interface for trapping into the standard LinuxSH BIOS. 5 * 6 * Copyright (C) 2000 Greg Banks, Mitch Davis 7 * 8 */ 9 10#include <asm/sh_bios.h> 11 12#define BIOS_CALL_CONSOLE_WRITE 0 13#define BIOS_CALL_READ_BLOCK 1 14#define BIOS_CALL_ETH_NODE_ADDR 10 15#define BIOS_CALL_SHUTDOWN 11 16#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */ 17#define BIOS_CALL_GDB_GET_MODE_PTR 0xfe 18#define BIOS_CALL_GDB_DETACH 0xff 19 20static __inline__ long sh_bios_call(long func, long arg0, long arg1, long arg2, long arg3) 21{ 22 register long r0 __asm__("r0") = func; 23 register long r4 __asm__("r4") = arg0; 24 register long r5 __asm__("r5") = arg1; 25 register long r6 __asm__("r6") = arg2; 26 register long r7 __asm__("r7") = arg3; 27 __asm__ __volatile__("trapa #0x3f" 28 : "=z" (r0) 29 : "0" (r0), "r" (r4), "r" (r5), "r" (r6), "r" (r7) 30 : "memory"); 31 return r0; 32} 33 34 35void sh_bios_console_write(const char *buf, unsigned int len) 36{ 37 sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0); 38} 39 40 41void sh_bios_char_out(char ch) 42{ 43 sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0); 44} 45 46 47int sh_bios_in_gdb_mode(void) 48{ 49 static char queried = 0; 50 static char *gdb_mode_p = 0; 51 52 if (!queried) 53 { 54 /* Query the gdb stub for address of its gdb mode variable */ 55 long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0); 56 if (r != ~0) /* BIOS returns -1 for unknown function */ 57 gdb_mode_p = (char *)r; 58 queried = 1; 59 } 60 return (gdb_mode_p != 0 ? *gdb_mode_p : 0); 61} 62 63void sh_bios_gdb_detach(void) 64{ 65 sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0); 66} 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