xref: /openbmc/linux/arch/sh/kernel/sh_bios.c (revision b627b4ed)
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 }
58