diff options
Diffstat (limited to 'contrib/syslinux-4.02/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c')
-rw-r--r-- | contrib/syslinux-4.02/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/contrib/syslinux-4.02/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c b/contrib/syslinux-4.02/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c new file mode 100644 index 0000000..094214b --- /dev/null +++ b/contrib/syslinux-4.02/gpxe/src/arch/i386/interface/pcbios/bios_smbios.c @@ -0,0 +1,86 @@ +/* + * 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 ); |