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/*-
* Copyright (c) 1997 Michael Smith
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: bios.c,v 1.6 1997/09/24 07:47:43 phk Exp $
*/
/*
* Code for dealing with the BIOS in x86 PC systems.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/md_var.h>
#include <machine/pc/bios.h>
#define BIOS_START 0xe0000
#define BIOS_SIZE 0x20000
/* exported lookup results */
struct bios32_SDentry PCIbios = {entry : 0};
struct SMBIOS_table *SMBIOStable = 0;
struct DMI_table *DMItable = 0;
static caddr_t bios32_SDCI = NULL;
static void bios32_init(void *junk);
/* start fairly early */
SYSINIT(bios32, SI_SUB_CPU, SI_ORDER_ANY, bios32_init, NULL);
/*
* bios32_init
*
* Locate various bios32 entities.
*/
static void
bios32_init(void *junk)
{
u_long sigaddr;
struct bios32_SDheader *sdh;
struct SMBIOS_table *sbt;
struct DMI_table *dmit;
u_int8_t ck, *cv;
int i;
/*
* BIOS32 Service Directory
*/
/* look for the signature */
if ((sigaddr = bios_sigsearch(0, "_32_", 4, 16, 0)) != 0) {
/* get a virtual pointer to the structure */
sdh = (struct bios32_SDheader *)BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)sdh, ck = 0, i = 0; i < (sdh->len * 16); i++) {
ck += cv[i];
}
/* If checksum is OK, enable use of the entrypoint */
if (ck == 0) {
bios32_SDCI = (caddr_t)BIOS_PADDRTOVADDR(sdh->entry);
if (bootverbose) {
printf("Found BIOS32 Service Directory header at %p\n", sdh);
printf("Entry = 0x%x (%p) Rev = %d Len = %d\n",
sdh->entry, bios32_SDCI, sdh->revision, sdh->len);
}
/* See if there's a PCI BIOS entrypoint here */
PCIbios.ident.id = 0x49435024; /* PCI systems should have this */
if (!bios32_SDlookup(&PCIbios) && bootverbose)
printf("PCI BIOS entry at 0x%x\n", PCIbios.entry);
} else {
printf("Bad BIOS32 Service Directory!\n");
}
}
/*
* System Management BIOS
*/
/* look for the SMBIOS signature */
if ((sigaddr = bios_sigsearch(0, "_SM_", 4, 16, 0)) != 0) {
/* get a virtual pointer to the structure */
sbt = (struct SMBIOS_table *)BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)sbt, ck = 0, i = 0; i < sbt->len; i++) {
ck += cv[i];
}
/* if checksum is OK, we have action */
if (ck == 0) {
SMBIOStable = sbt; /* save reference */
DMItable = &sbt->dmi; /* contained within */
if (bootverbose) {
printf("SMIBIOS header at %p\n", sbt);
printf("Version %d.%d\n", sbt->major, sbt->minor);
printf("Table at 0x%x, %d entries, %d bytes, largest entry %d bytes\n",
sbt->dmi.st_base, (int)sbt->dmi.st_entries, (int)sbt->dmi.st_size,
(int)sbt->st_maxsize);
}
} else {
printf("Bad SMBIOS table checksum!\n");
}
}
/* look for the DMI signature */
if ((sigaddr = bios_sigsearch(0, "_DMI_", 5, 16, 0)) != 0) {
/* get a virtual pointer to the structure */
dmit = (struct DMI_table *)BIOS_PADDRTOVADDR(sigaddr);
for (cv = (u_int8_t *)dmit, ck = 0, i = 0; i < 15; i++) {
ck += cv[i];
}
/* if checksum is OK, we have action */
if (ck == 0) {
DMItable = dmit; /* save reference */
if (bootverbose) {
printf("DMI header at %p\n", dmit);
printf("Version %d.%d\n", (dmit->bcd_revision >> 4),
(dmit->bcd_revision & 0x0f));
printf("Table at 0x%x, %d entries, %d bytes\n",
dmit->st_base, (int)dmit->st_entries,
(int)dmit->st_size);
}
} else {
printf("Bad DMI table checksum!\n");
}
}
if (bootverbose) {
/* look for other know signatures */
printf("Other BIOS signatures found:\n");
printf("ACPI: %08x\n", bios_sigsearch(0, "FACP", 4, 1, 0));
printf("$PnP: %08x\n", bios_sigsearch(0, "$PnP", 4, 16, 0));
}
}
/*
* bios32_SDlookup
*
* Query the BIOS32 Service Directory for the service named in (ent),
* returns nonzero if the lookup fails. The caller must fill in
* (ent->ident), the remainder are populated on a successful lookup.
*/
int
bios32_SDlookup(struct bios32_SDentry *ent)
{
struct bios32_args args;
if (bios32_SDCI != NULL) {
args.eax = ent->ident.id; /* set up arguments */
args.ebx = args.ecx = args.edx = 0;
bios32(bios32_SDCI, &args); /* make the BIOS call */
if ((args.eax & 0xff) == 0) { /* success? */
ent->base = args.ebx;
ent->len = args.ecx;
ent->entry = args.edx;
return(0); /* all OK */
}
}
return(1); /* failed */
}
/*
* bios_sigsearch
*
* Search some or all of the BIOS region for a signature string.
*
* (start) Optional offset returned from this function
* (for searching for multiple matches), or NULL
* to start the search from the base of the BIOS.
* Note that this will be a _physical_ address in
* the range 0xe0000 - 0xfffff.
* (sig) is a pointer to the byte(s) of the signature.
* (siglen) number of bytes in the signature.
* (paralen) signature paragraph (alignment) size.
* (sigofs) offset of the signature within the paragraph.
*
* Returns the _physical_ address of the found signature, 0 if the
* signature was not found.
*/
u_int32_t
bios_sigsearch(u_int32_t start, u_char *sig, int siglen, int paralen, int sigofs)
{
u_char *sp, *end;
int i;
/* compute the starting address */
if ((start >= BIOS_START) && (start <= (BIOS_START + BIOS_SIZE))) {
sp = (char *)BIOS_PADDRTOVADDR(start);
} else if (start == 0) {
sp = (char *)BIOS_PADDRTOVADDR(BIOS_START);
} else {
return 0; /* bogus start address */
}
/* compute the end address */
end = (u_char *)BIOS_PADDRTOVADDR(BIOS_START + BIOS_SIZE);
/* loop searching */
while ((sp + sigofs + siglen) < end) {
/* compare here */
if (!bcmp(sp + sigofs, sig, siglen)) {
/* convert back to physical address */
return((u_int32_t)BIOS_VADDRTOPADDR(sp));
}
sp += paralen;
}
return(0);
}
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