acpi.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License as
00006  * published by the Free Software Foundation; either version 2 of the
00007  * License, or any later version.
00008  *
00009  * This program is distributed in the hope that it will be useful, but
00010  * WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017  */
00018 
00019 FILE_LICENCE ( GPL2_OR_LATER );
00020 
00021 #include <gpxe/acpi.h>
00022 
00023 /** @file
00024  *
00025  * ACPI support functions
00026  *
00027  */
00028 
00029 /**
00030  * Fix up ACPI table checksum
00031  *
00032  * @v acpi              ACPI table header
00033  */
00034 void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
00035         unsigned int i = 0;
00036         uint8_t sum = 0;
00037 
00038         for ( i = 0 ; i < acpi->length ; i++ ) {
00039                 sum += *( ( ( uint8_t * ) acpi ) + i );
00040         }
00041         acpi->checksum -= sum;
00042 }