2 * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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.
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.
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., 51 Franklin Street, Fifth Floor, Boston, MA
20 FILE_LICENCE ( GPL2_OR_LATER );
23 #include <ipxe/acpi.h>
24 #include <ipxe/interface.h>
28 * ACPI support functions
32 /******************************************************************************
36 ******************************************************************************
40 * Fix up ACPI table checksum
42 * @v acpi ACPI table header
44 void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
48 for ( i = 0 ; i < acpi->length ; i++ ) {
49 sum += *( ( ( uint8_t * ) acpi ) + i );
51 acpi->checksum -= sum;
54 /******************************************************************************
58 ******************************************************************************
62 * Describe object in an ACPI table
66 * @v len Length of ACPI table
67 * @ret rc Return status code
69 int acpi_describe ( struct interface *intf,
70 struct acpi_description_header *acpi, size_t len ) {
71 struct interface *dest;
72 acpi_describe_TYPE ( void * ) *op =
73 intf_get_dest_op ( intf, acpi_describe, &dest );
74 void *object = intf_object ( dest );
78 rc = op ( object, acpi, len );
80 /* Default is to fail to describe */