mirror of https://github.com/F-Stack/f-stack.git
96 lines
3.2 KiB
C
96 lines
3.2 KiB
C
/*-
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* Copyright (c) 1997 Michael Smith
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* Copyright (c) 1998 Jonathan Lemon
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Subset of the i386 bios support code. We cannot make bios16 nor bios32
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* calls, so we can leave that out. However, searching for bios rom
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* signatures can be useful for locating tables, eg: powernow settings.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/vmparam.h>
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#include <machine/pc/bios.h>
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#define BIOS_START 0xe0000
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#define BIOS_SIZE 0x20000
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/*
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* bios_sigsearch
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*
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* Search some or all of the BIOS region for a signature string.
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*
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* (start) Optional offset returned from this function
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* (for searching for multiple matches), or NULL
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* to start the search from the base of the BIOS.
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* Note that this will be a _physical_ address in
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* the range 0xe0000 - 0xfffff.
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* (sig) is a pointer to the byte(s) of the signature.
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* (siglen) number of bytes in the signature.
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* (paralen) signature paragraph (alignment) size.
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* (sigofs) offset of the signature within the paragraph.
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*
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* Returns the _physical_ address of the found signature, 0 if the
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* signature was not found.
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*/
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u_int32_t
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bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
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{
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u_char *sp, *end;
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/* compute the starting address */
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if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
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sp = (char *)BIOS_PADDRTOVADDR(start);
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} else if (start == 0) {
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sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
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} else {
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return 0; /* bogus start address */
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}
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/* compute the end address */
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end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
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/* loop searching */
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while ((sp + sigofs + siglen) < end) {
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/* compare here */
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if (!bcmp(sp + sigofs, sig, siglen)) {
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/* convert back to physical address */
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return((u_int32_t)(uintptr_t)BIOS_VADDRTOPADDR(sp));
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}
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sp += paralen;
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}
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return(0);
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}
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