diff options
Diffstat (limited to 'qemu/roms/ipxe/src/arch/i386/firmware/pcbios/pnpbios.c')
-rw-r--r-- | qemu/roms/ipxe/src/arch/i386/firmware/pcbios/pnpbios.c | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/pnpbios.c b/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/pnpbios.c deleted file mode 100644 index 20ec35d75..000000000 --- a/qemu/roms/ipxe/src/arch/i386/firmware/pcbios/pnpbios.c +++ /dev/null @@ -1,114 +0,0 @@ -/* - * 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., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * You can also choose to distribute this program under the terms of - * the Unmodified Binary Distribution Licence (as given in the file - * COPYING.UBDL), provided that you have satisfied its requirements. - */ - -FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL ); - -#include <stdint.h> -#include <string.h> -#include <errno.h> -#include <realmode.h> -#include <pnpbios.h> - -/** @file - * - * PnP BIOS - * - */ - -/** PnP BIOS structure */ -struct pnp_bios { - /** Signature - * - * Must be equal to @c PNP_BIOS_SIGNATURE - */ - uint32_t signature; - /** Version as BCD (e.g. 1.0 is 0x10) */ - uint8_t version; - /** Length of this structure */ - uint8_t length; - /** System capabilities */ - uint16_t control; - /** Checksum */ - uint8_t checksum; -} __attribute__ (( packed )); - -/** Signature for a PnP BIOS structure */ -#define PNP_BIOS_SIGNATURE \ - ( ( '$' << 0 ) + ( 'P' << 8 ) + ( 'n' << 16 ) + ( 'P' << 24 ) ) - -/** - * Test address for PnP BIOS structure - * - * @v offset Offset within BIOS segment to test - * @ret rc Return status code - */ -static int is_pnp_bios ( unsigned int offset ) { - union { - struct pnp_bios pnp_bios; - uint8_t bytes[256]; /* 256 is maximum length possible */ - } u; - size_t len; - unsigned int i; - uint8_t sum = 0; - - /* Read start of header and verify signature */ - copy_from_real ( &u.pnp_bios, BIOS_SEG, offset, sizeof ( u.pnp_bios )); - if ( u.pnp_bios.signature != PNP_BIOS_SIGNATURE ) - return -EINVAL; - - /* Read whole header and verify checksum */ - len = u.pnp_bios.length; - copy_from_real ( &u.bytes, BIOS_SEG, offset, len ); - for ( i = 0 ; i < len ; i++ ) { - sum += u.bytes[i]; - } - if ( sum != 0 ) - return -EINVAL; - - DBG ( "Found PnP BIOS at %04x:%04x\n", BIOS_SEG, offset ); - - return 0; -} - -/** - * Locate Plug-and-Play BIOS - * - * @ret pnp_offset Offset of PnP BIOS structure within BIOS segment - * - * The PnP BIOS structure will be at BIOS_SEG:pnp_offset. If no PnP - * BIOS is found, -1 is returned. - */ -int find_pnp_bios ( void ) { - static int pnp_offset = 0; - - if ( pnp_offset ) - return pnp_offset; - - for ( pnp_offset = 0 ; pnp_offset < 0x10000 ; pnp_offset += 0x10 ) { - if ( is_pnp_bios ( pnp_offset ) == 0 ) - return pnp_offset; - } - - pnp_offset = -1; - return pnp_offset; -} |