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#ifndef _IPXE_ACPI_H
#define _IPXE_ACPI_H
/** @file
*
* ACPI data structures
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
#include <ipxe/interface.h>
/**
* An ACPI description header
*
* This is the structure common to the start of all ACPI system
* description tables.
*/
struct acpi_description_header {
/** ACPI signature (4 ASCII characters) */
uint32_t signature;
/** Length of table, in bytes, including header */
uint32_t length;
/** ACPI Specification minor version number */
uint8_t revision;
/** To make sum of entire table == 0 */
uint8_t checksum;
/** OEM identification */
char oem_id[6];
/** OEM table identification */
char oem_table_id[8];
/** OEM revision number */
uint32_t oem_revision;
/** ASL compiler vendor ID */
char asl_compiler_id[4];
/** ASL compiler revision number */
uint32_t asl_compiler_revision;
} __attribute__ (( packed ));
/**
* Build ACPI signature
*
* @v a First character of ACPI signature
* @v b Second character of ACPI signature
* @v c Third character of ACPI signature
* @v d Fourth character of ACPI signature
* @ret signature ACPI signature
*/
#define ACPI_SIGNATURE( a, b, c, d ) \
( ( (a) << 0 ) | ( (b) << 8 ) | ( (c) << 16 ) | ( (d) << 24 ) )
extern int acpi_describe ( struct interface *interface,
struct acpi_description_header *acpi, size_t len );
#define acpi_describe_TYPE( object_type ) \
typeof ( int ( object_type, \
struct acpi_description_header *acpi, \
size_t len ) )
extern void acpi_fix_checksum ( struct acpi_description_header *acpi );
#endif /* _IPXE_ACPI_H */
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