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
19 * You can also choose to distribute this program under the terms of
20 * the Unmodified Binary Distribution Licence (as given in the file
21 * COPYING.UBDL), provided that you have satisfied its requirements.
24 FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
27 #include <ipxe/acpi.h>
28 #include <ipxe/interface.h>
32 * ACPI support functions
36 /******************************************************************************
40 ******************************************************************************
44 * Fix up ACPI table checksum
46 * @v acpi ACPI table header
48 void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
52 for ( i = 0 ; i < acpi->length ; i++ ) {
53 sum += *( ( ( uint8_t * ) acpi ) + i );
55 acpi->checksum -= sum;
58 /******************************************************************************
62 ******************************************************************************
66 * Describe object in an ACPI table
70 * @v len Length of ACPI table
71 * @ret rc Return status code
73 int acpi_describe ( struct interface *intf,
74 struct acpi_description_header *acpi, size_t len ) {
75 struct interface *dest;
76 acpi_describe_TYPE ( void * ) *op =
77 intf_get_dest_op ( intf, acpi_describe, &dest );
78 void *object = intf_object ( dest );
82 rc = op ( object, acpi, len );
84 /* Default is to fail to describe */