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- /*
- * Copyright (C) 2006 Michael Brown <mbrown@fensystems.co.uk>.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- FILE_LICENCE ( GPL2_OR_LATER );
-
- #include <errno.h>
- #include <ipxe/acpi.h>
- #include <ipxe/interface.h>
-
- /** @file
- *
- * ACPI support functions
- *
- */
-
- /******************************************************************************
- *
- * Utility functions
- *
- ******************************************************************************
- */
-
- /**
- * Fix up ACPI table checksum
- *
- * @v acpi ACPI table header
- */
- void acpi_fix_checksum ( struct acpi_description_header *acpi ) {
- unsigned int i = 0;
- uint8_t sum = 0;
-
- for ( i = 0 ; i < acpi->length ; i++ ) {
- sum += *( ( ( uint8_t * ) acpi ) + i );
- }
- acpi->checksum -= sum;
- }
-
- /******************************************************************************
- *
- * Interface methods
- *
- ******************************************************************************
- */
-
- /**
- * Describe object in an ACPI table
- *
- * @v intf Interface
- * @v acpi ACPI table
- * @v len Length of ACPI table
- * @ret rc Return status code
- */
- int acpi_describe ( struct interface *intf,
- struct acpi_description_header *acpi, size_t len ) {
- struct interface *dest;
- acpi_describe_TYPE ( void * ) *op =
- intf_get_dest_op ( intf, acpi_describe, &dest );
- void *object = intf_object ( dest );
- int rc;
-
- if ( op ) {
- rc = op ( object, acpi, len );
- } else {
- /* Default is to fail to describe */
- rc = -EOPNOTSUPP;
- }
-
- intf_put ( dest );
- return rc;
- }
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