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/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <gpxe/uaccess.h>
#include <gpxe/smbios.h>
#include <realmode.h>
#include <pnpbios.h>
/** @file
*
* System Management BIOS
*
*/
/**
* Find SMBIOS
*
* @v smbios SMBIOS entry point descriptor structure to fill in
* @ret rc Return status code
*/
static int bios_find_smbios ( struct smbios *smbios ) {
union {
struct smbios_entry entry;
uint8_t bytes[256]; /* 256 is maximum length possible */
} u;
static unsigned int offset = 0;
size_t len;
unsigned int i;
uint8_t sum;
/* Try to find SMBIOS */
for ( ; offset < 0x10000 ; offset += 0x10 ) {
/* Read start of header and verify signature */
copy_from_real ( &u.entry, BIOS_SEG, offset,
sizeof ( u.entry ));
if ( u.entry.signature != SMBIOS_SIGNATURE )
continue;
/* Read whole header and verify checksum */
len = u.entry.len;
copy_from_real ( &u.bytes, BIOS_SEG, offset, len );
for ( i = 0 , sum = 0 ; i < len ; i++ ) {
sum += u.bytes[i];
}
if ( sum != 0 ) {
DBG ( "SMBIOS at %04x:%04x has bad checksum %02x\n",
BIOS_SEG, offset, sum );
continue;
}
/* Fill result structure */
DBG ( "Found SMBIOS v%d.%d entry point at %04x:%04x\n",
u.entry.major, u.entry.minor, BIOS_SEG, offset );
smbios->address = phys_to_user ( u.entry.smbios_address );
smbios->len = u.entry.smbios_len;
smbios->count = u.entry.smbios_count;
return 0;
}
DBG ( "No SMBIOS found\n" );
return -ENODEV;
}
PROVIDE_SMBIOS ( pcbios, find_smbios, bios_find_smbios );
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