The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/amd64/amd64/bios.c

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    1 /*-
    2  * Copyright (c) 1997 Michael Smith
    3  * Copyright (c) 1998 Jonathan Lemon
    4  * All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  */
   27 
   28 #include <sys/cdefs.h>
   29 __FBSDID("$FreeBSD: releng/10.2/sys/amd64/amd64/bios.c 148231 2005-07-21 09:48:37Z phk $");
   30 
   31 /*
   32  * Subset of the i386 bios support code.  We cannot make bios16 nor bios32
   33  * calls, so we can leave that out.  However, searching for bios rom
   34  * signatures can be useful for locating tables, eg: powernow settings.
   35  */
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/kernel.h>
   40 #include <vm/vm.h>
   41 #include <vm/pmap.h>
   42 #include <machine/vmparam.h>
   43 #include <machine/pc/bios.h>
   44 
   45 #define BIOS_START      0xe0000
   46 #define BIOS_SIZE       0x20000
   47 
   48 /*
   49  * bios_sigsearch
   50  *
   51  * Search some or all of the BIOS region for a signature string.
   52  *
   53  * (start)      Optional offset returned from this function 
   54  *              (for searching for multiple matches), or NULL
   55  *              to start the search from the base of the BIOS.
   56  *              Note that this will be a _physical_ address in
   57  *              the range 0xe0000 - 0xfffff.
   58  * (sig)        is a pointer to the byte(s) of the signature.
   59  * (siglen)     number of bytes in the signature.
   60  * (paralen)    signature paragraph (alignment) size.
   61  * (sigofs)     offset of the signature within the paragraph.
   62  *
   63  * Returns the _physical_ address of the found signature, 0 if the
   64  * signature was not found.
   65  */
   66 
   67 u_int32_t
   68 bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
   69 {
   70     u_char      *sp, *end;
   71     
   72     /* compute the starting address */
   73     if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
   74         sp = (char *)BIOS_PADDRTOVADDR(start);
   75     } else if (start == 0) {
   76         sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
   77     } else {
   78         return 0;                               /* bogus start address */
   79     }
   80 
   81     /* compute the end address */
   82     end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
   83 
   84     /* loop searching */
   85     while ((sp + sigofs + siglen) < end) {
   86         
   87         /* compare here */
   88         if (!bcmp(sp + sigofs, sig, siglen)) {
   89             /* convert back to physical address */
   90             return((u_int32_t)(uintptr_t)BIOS_VADDRTOPADDR(sp));
   91         }
   92         sp += paralen;
   93     }
   94     return(0);
   95 }

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