75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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* linux/arch/sh/kernel/sh_bios.c
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* C interface for trapping into the standard LinuxSH BIOS.
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*
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* Copyright (C) 2000 Greg Banks, Mitch Davis
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*
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*/
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#include <linux/module.h>
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#include <asm/sh_bios.h>
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#define BIOS_CALL_CONSOLE_WRITE 0
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#define BIOS_CALL_READ_BLOCK 1
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#define BIOS_CALL_ETH_NODE_ADDR 10
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#define BIOS_CALL_SHUTDOWN 11
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#define BIOS_CALL_CHAR_OUT 0x1f /* TODO: hack */
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#define BIOS_CALL_GDB_GET_MODE_PTR 0xfe
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#define BIOS_CALL_GDB_DETACH 0xff
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static inline long sh_bios_call(long func, long arg0, long arg1, long arg2,
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long arg3)
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{
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register long r0 __asm__("r0") = func;
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register long r4 __asm__("r4") = arg0;
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register long r5 __asm__("r5") = arg1;
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register long r6 __asm__("r6") = arg2;
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register long r7 __asm__("r7") = arg3;
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__asm__ __volatile__("trapa #0x3f":"=z"(r0)
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:"0"(r0), "r"(r4), "r"(r5), "r"(r6), "r"(r7)
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:"memory");
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return r0;
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}
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void sh_bios_console_write(const char *buf, unsigned int len)
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{
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sh_bios_call(BIOS_CALL_CONSOLE_WRITE, (long)buf, (long)len, 0, 0);
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}
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void sh_bios_char_out(char ch)
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{
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sh_bios_call(BIOS_CALL_CHAR_OUT, ch, 0, 0, 0);
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}
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int sh_bios_in_gdb_mode(void)
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{
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static char queried = 0;
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static char *gdb_mode_p = 0;
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if (!queried) {
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/* Query the gdb stub for address of its gdb mode variable */
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long r = sh_bios_call(BIOS_CALL_GDB_GET_MODE_PTR, 0, 0, 0, 0);
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if (r != ~0) /* BIOS returns -1 for unknown function */
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gdb_mode_p = (char *)r;
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queried = 1;
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}
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return (gdb_mode_p != 0 ? *gdb_mode_p : 0);
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}
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void sh_bios_gdb_detach(void)
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{
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sh_bios_call(BIOS_CALL_GDB_DETACH, 0, 0, 0, 0);
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}
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EXPORT_SYMBOL_GPL(sh_bios_gdb_detach);
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void sh_bios_get_node_addr(unsigned char *node_addr)
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{
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sh_bios_call(BIOS_CALL_ETH_NODE_ADDR, 0, (long)node_addr, 0, 0);
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}
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EXPORT_SYMBOL_GPL(sh_bios_get_node_addr);
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void sh_bios_shutdown(unsigned int how)
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{
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sh_bios_call(BIOS_CALL_SHUTDOWN, how, 0, 0, 0);
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}
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