1 /*
2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 */
18
19 FILE_LICENCE ( GPL2_OR_LATER );
20
21 #include <gpxe/acpi.h>
22
23 /** @file
24 *
25 * ACPI support functions
26 *
27 */
28
29 /**
30 * Fix up ACPI table checksum
31 *
32 * @v acpi ACPI table header
33 */
acpi_fix_checksum(struct acpi_description_header * acpi)34 void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
35 unsigned int i = 0;
36 uint8_t sum = 0;
37
38 for ( i = 0 ; i < acpi->length ; i++ ) {
39 sum += *( ( ( uint8_t * ) acpi ) + i );
40 }
41 acpi->checksum -= sum;
42 }
43