1 /* $OpenBSD: biosprobe.c,v 1.4 2004/03/09 19:12:12 tom Exp $ */
2
3 /*
4 * Copyright (c) 2002 Tobias Weingartner
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include <sys/param.h>
29 #include <machine/biosvar.h>
30 #include <machine/pio.h>
31 #include <dev/cons.h>
32 #include <sys/disklabel.h>
33 #include "disk.h"
34 #include "debug.h"
35 #include "libsa.h"
36 #include "biosdev.h"
37
38
39 void *
40 getSYSCONFaddr(void)
41 {
42 u_int32_t status;
43 u_int8_t *vers;
44
45 __asm __volatile(DOINT(0x15) "\n\t"
46 "setc %%al\n\t"
47 : "=a" (status)
48 : "0" (0xC000)
49 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
50
51 /* On failure we go for a NULL */
52 if (status)
53 return NULL;
54
55 /* Calculate where the version bytes are */
56 vers = (void*)((BIOS_regs.biosr_es << 4) | BIOS_regs.biosr_bx);
57 return vers;
58 }
59
60 void *
61 getEBDAaddr(void)
62 {
63 u_int32_t status;
64 u_int8_t *info;
65
66 info = getSYSCONFaddr();
67
68 if (!info)
69 return NULL;
70
71 __asm __volatile(DOINT(0x15) "\n\t"
72 "setc %%al"
73 : "=a" (status)
74 : "0" (0xC100)
75 : "%ebx", "%ecx", "%edx", "%esi", "%edi", "cc");
76
77 if (status)
78 return NULL;
79
80 info = (void *)(BIOS_regs.biosr_es << 4);
81
82 return info;
83 }