mirror of https://github.com/ipxe/ipxe.git
139 lines
3.8 KiB
C
139 lines
3.8 KiB
C
#ifndef _IPXE_ACPI_H
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#define _IPXE_ACPI_H
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/** @file
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*
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* ACPI data structures
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*
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*/
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FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
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#include <stdint.h>
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#include <ipxe/interface.h>
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#include <ipxe/uaccess.h>
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/**
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* An ACPI description header
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*
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* This is the structure common to the start of all ACPI system
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* description tables.
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*/
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struct acpi_description_header {
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/** ACPI signature (4 ASCII characters) */
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uint32_t signature;
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/** Length of table, in bytes, including header */
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uint32_t length;
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/** ACPI Specification minor version number */
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uint8_t revision;
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/** To make sum of entire table == 0 */
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uint8_t checksum;
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/** OEM identification */
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char oem_id[6];
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/** OEM table identification */
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char oem_table_id[8];
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/** OEM revision number */
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uint32_t oem_revision;
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/** ASL compiler vendor ID */
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char asl_compiler_id[4];
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/** ASL compiler revision number */
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uint32_t asl_compiler_revision;
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} __attribute__ (( packed ));
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/**
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* Build ACPI signature
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*
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* @v a First character of ACPI signature
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* @v b Second character of ACPI signature
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* @v c Third character of ACPI signature
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* @v d Fourth character of ACPI signature
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* @ret signature ACPI signature
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*/
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#define ACPI_SIGNATURE( a, b, c, d ) \
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( ( (a) << 0 ) | ( (b) << 8 ) | ( (c) << 16 ) | ( (d) << 24 ) )
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/** Root System Description Pointer signature */
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#define RSDP_SIGNATURE { 'R', 'S', 'D', ' ', 'P', 'T', 'R', ' ' }
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/** Root System Description Pointer */
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struct acpi_rsdp {
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/** Signature */
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char signature[8];
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/** To make sum of entire table == 0 */
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uint8_t checksum;
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/** OEM identification */
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char oem_id[6];
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/** Revision */
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uint8_t revision;
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/** Physical address of RSDT */
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uint32_t rsdt;
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} __attribute__ (( packed ));
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/** EBDA RSDP length */
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#define RSDP_EBDA_LEN 0x400
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/** Fixed BIOS area RSDP start address */
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#define RSDP_BIOS_START 0xe0000
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/** Fixed BIOS area RSDP length */
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#define RSDP_BIOS_LEN 0x20000
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/** Stride at which to search for RSDP */
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#define RSDP_STRIDE 16
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/** Root System Description Table (RSDT) signature */
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#define RSDT_SIGNATURE ACPI_SIGNATURE ( 'R', 'S', 'D', 'T' )
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/** ACPI Root System Description Table (RSDT) */
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struct acpi_rsdt {
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/** ACPI header */
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struct acpi_description_header acpi;
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/** ACPI table entries */
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uint32_t entry[0];
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} __attribute__ (( packed ));
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/** Fixed ACPI Description Table (FADT) signature */
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#define FADT_SIGNATURE ACPI_SIGNATURE ( 'F', 'A', 'C', 'P' )
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/** Fixed ACPI Description Table (FADT) */
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struct acpi_fadt {
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/** ACPI header */
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struct acpi_description_header acpi;
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/** Physical address of FACS */
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uint32_t facs;
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/** Physical address of DSDT */
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uint32_t dsdt;
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/** Unused by iPXE */
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uint8_t unused[20];
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/** PM1a Control Register Block */
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uint32_t pm1a_cnt_blk;
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/** PM1b Control Register Block */
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uint32_t pm1b_cnt_blk;
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} __attribute__ (( packed ));
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/** ACPI PM1 Control Register (within PM1a_CNT_BLK or PM1A_CNT_BLK) */
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#define ACPI_PM1_CNT 0
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#define ACPI_PM1_CNT_SLP_TYP(x) ( (x) << 10 ) /**< Sleep type */
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#define ACPI_PM1_CNT_SLP_EN ( 1 << 13 ) /**< Sleep enable */
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/** Differentiated System Description Table (DSDT) signature */
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#define DSDT_SIGNATURE ACPI_SIGNATURE ( 'D', 'S', 'D', 'T' )
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/** Secondary System Description Table (SSDT) signature */
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#define SSDT_SIGNATURE ACPI_SIGNATURE ( 'S', 'S', 'D', 'T' )
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extern int acpi_describe ( struct interface *interface,
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struct acpi_description_header *acpi, size_t len );
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#define acpi_describe_TYPE( object_type ) \
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typeof ( int ( object_type, \
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struct acpi_description_header *acpi, \
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size_t len ) )
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extern void acpi_fix_checksum ( struct acpi_description_header *acpi );
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extern userptr_t acpi_find_rsdt ( userptr_t ebda );
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extern userptr_t acpi_find ( userptr_t rsdt, uint32_t signature,
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unsigned int index );
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extern int acpi_sx ( userptr_t rsdt, uint32_t signature );
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#endif /* _IPXE_ACPI_H */
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