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 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 19 static __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 34 void 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 40 void sh_bios_char_out(char ch) 41 { 42 sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0); 43 } 44 45 46 int 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 62 void sh_bios_gdb_detach(void) 63 { 64 sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0); 65 } 66 67 void sh_bios_get_node_addr (unsigned char *node_addr) 68 { 69 sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0); 70 } 71 72 void sh_bios_shutdown(unsigned int how) 73 { 74 sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0); 75 } 76