/* * 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); }