87 lines
2.1 KiB
C
87 lines
2.1 KiB
C
/*
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* Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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FILE_LICENCE ( GPL2_OR_LATER );
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#include <errno.h>
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#include <ipxe/acpi.h>
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#include <ipxe/interface.h>
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/** @file
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*
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* ACPI support functions
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*
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*/
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/******************************************************************************
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*
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* Utility functions
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*
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******************************************************************************
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*/
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/**
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* Fix up ACPI table checksum
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*
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* @v acpi ACPI table header
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*/
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void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
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unsigned int i = 0;
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uint8_t sum = 0;
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for ( i = 0 ; i < acpi->length ; i++ ) {
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sum += *( ( ( uint8_t * ) acpi ) + i );
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}
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acpi->checksum -= sum;
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}
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/******************************************************************************
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*
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* Interface methods
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*
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******************************************************************************
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*/
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/**
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* Describe object in an ACPI table
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*
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* @v intf Interface
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* @v acpi ACPI table
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* @v len Length of ACPI table
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* @ret rc Return status code
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*/
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int acpi_describe ( struct interface *intf,
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struct acpi_description_header *acpi, size_t len ) {
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struct interface *dest;
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acpi_describe_TYPE ( void * ) *op =
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intf_get_dest_op ( intf, acpi_describe, &dest );
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void *object = intf_object ( dest );
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int rc;
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if ( op ) {
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rc = op ( object, acpi, len );
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} else {
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/* Default is to fail to describe */
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rc = -EOPNOTSUPP;
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}
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intf_put ( dest );
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return rc;
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}
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