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