1ededf5edSSascha Wildner /*-
2ededf5edSSascha Wildner * Copyright (c) 1997 Michael Smith
3ededf5edSSascha Wildner * Copyright (c) 1998 Jonathan Lemon
4ededf5edSSascha Wildner * All rights reserved.
5ededf5edSSascha Wildner *
6ededf5edSSascha Wildner * Redistribution and use in source and binary forms, with or without
7ededf5edSSascha Wildner * modification, are permitted provided that the following conditions
8ededf5edSSascha Wildner * are met:
9ededf5edSSascha Wildner * 1. Redistributions of source code must retain the above copyright
10ededf5edSSascha Wildner * notice, this list of conditions and the following disclaimer.
11ededf5edSSascha Wildner * 2. Redistributions in binary form must reproduce the above copyright
12ededf5edSSascha Wildner * notice, this list of conditions and the following disclaimer in the
13ededf5edSSascha Wildner * documentation and/or other materials provided with the distribution.
14ededf5edSSascha Wildner *
15ededf5edSSascha Wildner * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16ededf5edSSascha Wildner * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17ededf5edSSascha Wildner * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18ededf5edSSascha Wildner * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19ededf5edSSascha Wildner * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20ededf5edSSascha Wildner * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21ededf5edSSascha Wildner * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22ededf5edSSascha Wildner * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23ededf5edSSascha Wildner * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24ededf5edSSascha Wildner * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25ededf5edSSascha Wildner * SUCH DAMAGE.
26ededf5edSSascha Wildner *
27ededf5edSSascha Wildner * $FreeBSD: head/sys/amd64/amd64/bios.c 148231 2005-07-21 09:48:37Z phk $
28ededf5edSSascha Wildner */
29ededf5edSSascha Wildner
30ededf5edSSascha Wildner /*
31*466d4f43Szrj * Subset of the x86 bios support code. We cannot make bios16 nor bios32
32ededf5edSSascha Wildner * calls, so we can leave that out. However, searching for bios rom
33ededf5edSSascha Wildner * signatures can be useful for locating tables, eg: powernow settings.
34ededf5edSSascha Wildner */
35ededf5edSSascha Wildner
36ededf5edSSascha Wildner #include <sys/param.h>
37ededf5edSSascha Wildner #include <sys/systm.h>
38ededf5edSSascha Wildner #include <sys/kernel.h>
39ededf5edSSascha Wildner #include <vm/vm.h>
40ededf5edSSascha Wildner #include <vm/pmap.h>
41ededf5edSSascha Wildner #include <machine/vmparam.h>
42ededf5edSSascha Wildner #include <machine/pc/bios.h>
43ededf5edSSascha Wildner
44ededf5edSSascha Wildner #define BIOS_START 0xe0000
45ededf5edSSascha Wildner #define BIOS_SIZE 0x20000
46ededf5edSSascha Wildner
47ededf5edSSascha Wildner /*
48ededf5edSSascha Wildner * bios_sigsearch
49ededf5edSSascha Wildner *
50ededf5edSSascha Wildner * Search some or all of the BIOS region for a signature string.
51ededf5edSSascha Wildner *
52ededf5edSSascha Wildner * (start) Optional offset returned from this function
53ededf5edSSascha Wildner * (for searching for multiple matches), or NULL
54ededf5edSSascha Wildner * to start the search from the base of the BIOS.
55ededf5edSSascha Wildner * Note that this will be a _physical_ address in
56ededf5edSSascha Wildner * the range 0xe0000 - 0xfffff.
57ededf5edSSascha Wildner * (sig) is a pointer to the byte(s) of the signature.
58ededf5edSSascha Wildner * (siglen) number of bytes in the signature.
59ededf5edSSascha Wildner * (paralen) signature paragraph (alignment) size.
60ededf5edSSascha Wildner * (sigofs) offset of the signature within the paragraph.
61ededf5edSSascha Wildner *
62ededf5edSSascha Wildner * Returns the _physical_ address of the found signature, 0 if the
63ededf5edSSascha Wildner * signature was not found.
64ededf5edSSascha Wildner */
65ededf5edSSascha Wildner
66ededf5edSSascha Wildner u_int32_t
bios_sigsearch(u_int32_t start,u_char * sig,int siglen,int paralen,int sigofs)67ededf5edSSascha Wildner bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
68ededf5edSSascha Wildner {
69ededf5edSSascha Wildner u_char *sp, *end;
70ededf5edSSascha Wildner
71ededf5edSSascha Wildner /* compute the starting address */
72ededf5edSSascha Wildner if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
73ededf5edSSascha Wildner sp = (char *)BIOS_PADDRTOVADDR(start);
74ededf5edSSascha Wildner } else if (start == 0) {
75ededf5edSSascha Wildner sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
76ededf5edSSascha Wildner } else {
77ededf5edSSascha Wildner return 0; /* bogus start address */
78ededf5edSSascha Wildner }
79ededf5edSSascha Wildner
80ededf5edSSascha Wildner /* compute the end address */
81ededf5edSSascha Wildner end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
82ededf5edSSascha Wildner
83ededf5edSSascha Wildner /* loop searching */
84ededf5edSSascha Wildner while ((sp + sigofs + siglen) < end) {
85ededf5edSSascha Wildner
86ededf5edSSascha Wildner /* compare here */
87ededf5edSSascha Wildner if (!bcmp(sp + sigofs, sig, siglen)) {
88ededf5edSSascha Wildner /* convert back to physical address */
89ededf5edSSascha Wildner return((u_int32_t)(uintptr_t)BIOS_VADDRTOPADDR(sp));
90ededf5edSSascha Wildner }
91ededf5edSSascha Wildner sp += paralen;
92ededf5edSSascha Wildner }
93ededf5edSSascha Wildner return(0);
94ededf5edSSascha Wildner }
95