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#ifndef _IPXE_ACPI_H
#define _IPXE_ACPI_H
/** @file
*
* ACPI data structures
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/interface.h>
#include <ipxe/uaccess.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 ) )
/** Root System Description Pointer signature */
#define RSDP_SIGNATURE { 'R', 'S', 'D', ' ', 'P', 'T', 'R', ' ' }
/** Root System Description Pointer */
struct acpi_rsdp {
/** Signature */
char signature[8];
/** To make sum of entire table == 0 */
uint8_t checksum;
/** OEM identification */
char oem_id[6];
/** Revision */
uint8_t revision;
/** Physical address of RSDT */
uint32_t rsdt;
} __attribute__ (( packed ));
/** EBDA RSDP length */
#define RSDP_EBDA_LEN 0x400
/** Fixed BIOS area RSDP start address */
#define RSDP_BIOS_START 0xe0000
/** Fixed BIOS area RSDP length */
#define RSDP_BIOS_LEN 0x20000
/** Stride at which to search for RSDP */
#define RSDP_STRIDE 16
/** Root System Description Table (RSDT) signature */
#define RSDT_SIGNATURE ACPI_SIGNATURE ( 'R', 'S', 'D', 'T' )
/** ACPI Root System Description Table (RSDT) */
struct acpi_rsdt {
/** ACPI header */
struct acpi_description_header acpi;
/** ACPI table entries */
uint32_t entry[0];
} __attribute__ (( packed ));
/** Fixed ACPI Description Table (FADT) signature */
#define FADT_SIGNATURE ACPI_SIGNATURE ( 'F', 'A', 'C', 'P' )
/** Fixed ACPI Description Table (FADT) */
struct acpi_fadt {
/** ACPI header */
struct acpi_description_header acpi;
/** Physical address of FACS */
uint32_t facs;
/** Physical address of DSDT */
uint32_t dsdt;
/** Unused by iPXE */
uint8_t unused[20];
/** PM1a Control Register Block */
uint32_t pm1a_cnt_blk;
/** PM1b Control Register Block */
uint32_t pm1b_cnt_blk;
} __attribute__ (( packed ));
/** ACPI PM1 Control Register (within PM1a_CNT_BLK or PM1A_CNT_BLK) */
#define ACPI_PM1_CNT 0
#define ACPI_PM1_CNT_SLP_TYP(x) ( (x) << 10 ) /**< Sleep type */
#define ACPI_PM1_CNT_SLP_EN ( 1 << 13 ) /**< Sleep enable */
/** Differentiated System Description Table (DSDT) signature */
#define DSDT_SIGNATURE ACPI_SIGNATURE ( 'D', 'S', 'D', 'T' )
/** Secondary System Description Table (SSDT) signature */
#define SSDT_SIGNATURE ACPI_SIGNATURE ( 'S', 'S', 'D', 'T' )
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 );
extern userptr_t acpi_find_rsdt ( userptr_t ebda );
extern userptr_t acpi_find ( userptr_t rsdt, uint32_t signature,
unsigned int index );
extern int acpi_sx ( userptr_t rsdt, uint32_t signature );
#endif /* _IPXE_ACPI_H */
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