mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-12-26 16:47:40 +01:00
659 lines
20 KiB
C
659 lines
20 KiB
C
/** @file
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ACPI 1.0b definitions from the ACPI Specification, revision 1.0b
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _ACPI_1_0_H_
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#define _ACPI_1_0_H_
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#include <IndustryStandard/AcpiAml.h>
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///
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/// Common table header, this prefaces all ACPI tables, including FACS, but
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/// excluding the RSD PTR structure.
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///
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typedef struct {
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UINT32 Signature;
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UINT32 Length;
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} EFI_ACPI_COMMON_HEADER;
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#pragma pack(1)
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///
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/// The common ACPI description table header. This structure prefaces most ACPI tables.
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///
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typedef struct {
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union {
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UINT32 Signature;
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CHAR8 SignatureAs4Char[4];
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};
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UINT32 Length;
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UINT8 Revision;
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UINT8 Checksum;
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UINT8 OemId[6];
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UINT64 OemTableId;
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UINT32 OemRevision;
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UINT32 CreatorId;
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UINT32 CreatorRevision;
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} EFI_ACPI_DESCRIPTION_HEADER;
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#pragma pack()
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//
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// Define for Desriptor
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//
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#define ACPI_SMALL_ITEM_FLAG 0x00
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#define ACPI_LARGE_ITEM_FLAG 0x01
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//
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// Small Item Descriptor Name
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//
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#define ACPI_SMALL_IRQ_DESCRIPTOR_NAME 0x04
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#define ACPI_SMALL_DMA_DESCRIPTOR_NAME 0x05
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#define ACPI_SMALL_START_DEPENDENT_DESCRIPTOR_NAME 0x06
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#define ACPI_SMALL_END_DEPENDENT_DESCRIPTOR_NAME 0x07
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#define ACPI_SMALL_IO_PORT_DESCRIPTOR_NAME 0x08
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#define ACPI_SMALL_FIXED_IO_PORT_DESCRIPTOR_NAME 0x09
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#define ACPI_SMALL_VENDOR_DEFINED_DESCRIPTOR_NAME 0x0E
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#define ACPI_SMALL_END_TAG_DESCRIPTOR_NAME 0x0F
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//
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// Large Item Descriptor Name
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//
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#define ACPI_LARGE_24_BIT_MEMORY_RANGE_DESCRIPTOR_NAME 0x01
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#define ACPI_LARGE_VENDOR_DEFINED_DESCRIPTOR_NAME 0x04
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#define ACPI_LARGE_32_BIT_MEMORY_RANGE_DESCRIPTOR_NAME 0x05
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#define ACPI_LARGE_32_BIT_FIXED_MEMORY_RANGE_DESCRIPTOR_NAME 0x06
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#define ACPI_LARGE_DWORD_ADDRESS_SPACE_DESCRIPTOR_NAME 0x07
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#define ACPI_LARGE_WORD_ADDRESS_SPACE_DESCRIPTOR_NAME 0x08
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#define ACPI_LARGE_EXTENDED_IRQ_DESCRIPTOR_NAME 0x09
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#define ACPI_LARGE_QWORD_ADDRESS_SPACE_DESCRIPTOR_NAME 0x0A
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//
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// Small Item Descriptor Value
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//
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#define ACPI_IRQ_NOFLAG_DESCRIPTOR 0x22
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#define ACPI_IRQ_DESCRIPTOR 0x23
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#define ACPI_DMA_DESCRIPTOR 0x2A
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#define ACPI_START_DEPENDENT_DESCRIPTOR 0x30
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#define ACPI_START_DEPENDENT_EX_DESCRIPTOR 0x31
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#define ACPI_END_DEPENDENT_DESCRIPTOR 0x38
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#define ACPI_IO_PORT_DESCRIPTOR 0x47
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#define ACPI_FIXED_LOCATION_IO_PORT_DESCRIPTOR 0x4B
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#define ACPI_END_TAG_DESCRIPTOR 0x79
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//
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// Large Item Descriptor Value
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//
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#define ACPI_24_BIT_MEMORY_RANGE_DESCRIPTOR 0x81
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#define ACPI_32_BIT_MEMORY_RANGE_DESCRIPTOR 0x85
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#define ACPI_32_BIT_FIXED_MEMORY_RANGE_DESCRIPTOR 0x86
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#define ACPI_DWORD_ADDRESS_SPACE_DESCRIPTOR 0x87
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#define ACPI_WORD_ADDRESS_SPACE_DESCRIPTOR 0x88
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#define ACPI_EXTENDED_INTERRUPT_DESCRIPTOR 0x89
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#define ACPI_QWORD_ADDRESS_SPACE_DESCRIPTOR 0x8A
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#define ACPI_ADDRESS_SPACE_DESCRIPTOR 0x8A
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//
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// Resource Type
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//
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#define ACPI_ADDRESS_SPACE_TYPE_MEM 0x00
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#define ACPI_ADDRESS_SPACE_TYPE_IO 0x01
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#define ACPI_ADDRESS_SPACE_TYPE_BUS 0x02
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///
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/// Power Management Timer frequency is fixed at 3.579545MHz.
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///
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#define ACPI_TIMER_FREQUENCY 3579545
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//
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// Ensure proper structure formats
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//
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#pragma pack(1)
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///
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/// The commond definition of QWORD, DWORD, and WORD
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/// Address Space Descriptors.
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///
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typedef PACKED struct {
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UINT8 Desc;
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UINT16 Len;
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UINT8 ResType;
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UINT8 GenFlag;
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UINT8 SpecificFlag;
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UINT64 AddrSpaceGranularity;
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UINT64 AddrRangeMin;
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UINT64 AddrRangeMax;
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UINT64 AddrTranslationOffset;
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UINT64 AddrLen;
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} EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR;
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typedef PACKED union {
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UINT8 Byte;
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PACKED struct {
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UINT8 Length : 3;
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UINT8 Name : 4;
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UINT8 Type : 1;
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} Bits;
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} ACPI_SMALL_RESOURCE_HEADER;
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typedef PACKED struct {
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PACKED union {
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UINT8 Byte;
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PACKED struct {
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UINT8 Name : 7;
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UINT8 Type : 1;
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}Bits;
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} Header;
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UINT16 Length;
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} ACPI_LARGE_RESOURCE_HEADER;
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///
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/// IRQ Descriptor.
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///
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typedef PACKED struct {
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ACPI_SMALL_RESOURCE_HEADER Header;
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UINT16 Mask;
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} EFI_ACPI_IRQ_NOFLAG_DESCRIPTOR;
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///
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/// IRQ Descriptor.
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///
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typedef PACKED struct {
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ACPI_SMALL_RESOURCE_HEADER Header;
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UINT16 Mask;
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UINT8 Information;
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} EFI_ACPI_IRQ_DESCRIPTOR;
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///
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/// DMA Descriptor.
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///
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typedef PACKED struct {
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ACPI_SMALL_RESOURCE_HEADER Header;
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UINT8 ChannelMask;
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UINT8 Information;
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} EFI_ACPI_DMA_DESCRIPTOR;
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///
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/// I/O Port Descriptor
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///
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typedef PACKED struct {
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ACPI_SMALL_RESOURCE_HEADER Header;
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UINT8 Information;
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UINT16 BaseAddressMin;
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UINT16 BaseAddressMax;
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UINT8 Alignment;
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UINT8 Length;
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} EFI_ACPI_IO_PORT_DESCRIPTOR;
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///
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/// Fixed Location I/O Port Descriptor.
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///
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typedef PACKED struct {
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ACPI_SMALL_RESOURCE_HEADER Header;
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UINT16 BaseAddress;
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UINT8 Length;
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} EFI_ACPI_FIXED_LOCATION_IO_PORT_DESCRIPTOR;
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///
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/// 24-Bit Memory Range Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 Information;
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UINT16 BaseAddressMin;
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UINT16 BaseAddressMax;
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UINT16 Alignment;
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UINT16 Length;
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} EFI_ACPI_24_BIT_MEMORY_RANGE_DESCRIPTOR;
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///
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/// 32-Bit Memory Range Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 Information;
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UINT32 BaseAddressMin;
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UINT32 BaseAddressMax;
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UINT32 Alignment;
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UINT32 Length;
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} EFI_ACPI_32_BIT_MEMORY_RANGE_DESCRIPTOR;
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///
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/// Fixed 32-Bit Fixed Memory Range Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 Information;
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UINT32 BaseAddress;
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UINT32 Length;
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} EFI_ACPI_32_BIT_FIXED_MEMORY_RANGE_DESCRIPTOR;
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///
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/// QWORD Address Space Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 ResType;
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UINT8 GenFlag;
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UINT8 SpecificFlag;
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UINT64 AddrSpaceGranularity;
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UINT64 AddrRangeMin;
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UINT64 AddrRangeMax;
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UINT64 AddrTranslationOffset;
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UINT64 AddrLen;
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} EFI_ACPI_QWORD_ADDRESS_SPACE_DESCRIPTOR;
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///
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/// DWORD Address Space Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 ResType;
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UINT8 GenFlag;
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UINT8 SpecificFlag;
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UINT32 AddrSpaceGranularity;
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UINT32 AddrRangeMin;
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UINT32 AddrRangeMax;
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UINT32 AddrTranslationOffset;
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UINT32 AddrLen;
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} EFI_ACPI_DWORD_ADDRESS_SPACE_DESCRIPTOR;
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///
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/// WORD Address Space Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 ResType;
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UINT8 GenFlag;
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UINT8 SpecificFlag;
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UINT16 AddrSpaceGranularity;
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UINT16 AddrRangeMin;
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UINT16 AddrRangeMax;
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UINT16 AddrTranslationOffset;
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UINT16 AddrLen;
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} EFI_ACPI_WORD_ADDRESS_SPACE_DESCRIPTOR;
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///
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/// Extended Interrupt Descriptor
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///
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typedef PACKED struct {
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ACPI_LARGE_RESOURCE_HEADER Header;
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UINT8 InterruptVectorFlags;
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UINT8 InterruptTableLength;
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UINT32 InterruptNumber[1];
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} EFI_ACPI_EXTENDED_INTERRUPT_DESCRIPTOR;
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#pragma pack()
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///
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/// The End tag identifies an end of resource data.
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///
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typedef struct {
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UINT8 Desc;
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UINT8 Checksum;
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} EFI_ACPI_END_TAG_DESCRIPTOR;
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//
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// General use definitions
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//
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#define EFI_ACPI_RESERVED_BYTE 0x00
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#define EFI_ACPI_RESERVED_WORD 0x0000
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#define EFI_ACPI_RESERVED_DWORD 0x00000000
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#define EFI_ACPI_RESERVED_QWORD 0x0000000000000000
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//
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// Resource Type Specific Flags
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// Ref ACPI specification 6.4.3.5.5
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//
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// Bit [0] : Write Status, _RW
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//
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_READ_WRITE (1 << 0)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_READ_ONLY (0 << 0)
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//
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// Bit [2:1] : Memory Attributes, _MEM
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//
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_NON_CACHEABLE (0 << 1)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE (1 << 1)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_WRITE_COMBINING (2 << 1)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_CACHEABLE_PREFETCHABLE (3 << 1)
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//
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// Bit [4:3] : Memory Attributes, _MTP
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//
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_ADDRESS_RANGE_MEMORY (0 << 3)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_ADDRESS_RANGE_RESERVED (1 << 3)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_ADDRESS_RANGE_ACPI (2 << 3)
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#define EFI_APCI_MEMORY_RESOURCE_SPECIFIC_FLAG_ADDRESS_RANGE_NVS (3 << 3)
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//
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// Bit [5] : Memory to I/O Translation, _TTP
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//
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_TYPE_TRANSLATION (1 << 5)
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#define EFI_ACPI_MEMORY_RESOURCE_SPECIFIC_FLAG_TYPE_STATIC (0 << 5)
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//
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// IRQ Information
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// Ref ACPI specification 6.4.2.1
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//
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#define EFI_ACPI_IRQ_SHARABLE_MASK 0x10
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#define EFI_ACPI_IRQ_SHARABLE 0x10
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#define EFI_ACPI_IRQ_POLARITY_MASK 0x08
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#define EFI_ACPI_IRQ_HIGH_TRUE 0x00
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#define EFI_ACPI_IRQ_LOW_FALSE 0x08
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#define EFI_ACPI_IRQ_MODE 0x01
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#define EFI_ACPI_IRQ_LEVEL_TRIGGERED 0x00
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#define EFI_ACPI_IRQ_EDGE_TRIGGERED 0x01
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//
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// DMA Information
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// Ref ACPI specification 6.4.2.2
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//
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#define EFI_ACPI_DMA_SPEED_TYPE_MASK 0x60
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#define EFI_ACPI_DMA_SPEED_TYPE_COMPATIBILITY 0x00
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#define EFI_ACPI_DMA_SPEED_TYPE_A 0x20
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#define EFI_ACPI_DMA_SPEED_TYPE_B 0x40
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#define EFI_ACPI_DMA_SPEED_TYPE_F 0x60
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#define EFI_ACPI_DMA_BUS_MASTER_MASK 0x04
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#define EFI_ACPI_DMA_BUS_MASTER 0x04
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#define EFI_ACPI_DMA_TRANSFER_TYPE_MASK 0x03
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#define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT 0x00
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#define EFI_ACPI_DMA_TRANSFER_TYPE_8_BIT_AND_16_BIT 0x01
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#define EFI_ACPI_DMA_TRANSFER_TYPE_16_BIT 0x10
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//
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// IO Information
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// Ref ACPI specification 6.4.2.5
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//
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#define EFI_ACPI_IO_DECODE_MASK 0x01
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#define EFI_ACPI_IO_DECODE_16_BIT 0x01
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#define EFI_ACPI_IO_DECODE_10_BIT 0x00
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//
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// Memory Information
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// Ref ACPI specification 6.4.3.4
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//
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#define EFI_ACPI_MEMORY_WRITE_STATUS_MASK 0x01
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#define EFI_ACPI_MEMORY_WRITABLE 0x01
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#define EFI_ACPI_MEMORY_NON_WRITABLE 0x00
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//
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// Ensure proper structure formats
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//
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#pragma pack(1)
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//
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// ACPI 1.0b table structures
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//
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///
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/// Root System Description Pointer Structure.
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///
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typedef struct {
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UINT64 Signature;
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UINT8 Checksum;
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UINT8 OemId[6];
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UINT8 Reserved;
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UINT32 RsdtAddress;
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} EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_POINTER;
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//
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// Root System Description Table
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// No definition needed as it is a common description table header, the same with
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// EFI_ACPI_DESCRIPTION_HEADER, followed by a variable number of UINT32 table pointers.
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//
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///
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/// RSDT Revision (as defined in ACPI 1.0b specification).
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///
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#define EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_TABLE_REVISION 0x01
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///
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/// Fixed ACPI Description Table Structure (FADT).
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///
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typedef struct {
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EFI_ACPI_DESCRIPTION_HEADER Header;
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UINT32 FirmwareCtrl;
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UINT32 Dsdt;
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UINT8 IntModel;
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UINT8 Reserved1;
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UINT16 SciInt;
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UINT32 SmiCmd;
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UINT8 AcpiEnable;
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UINT8 AcpiDisable;
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UINT8 S4BiosReq;
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UINT8 Reserved2;
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UINT32 Pm1aEvtBlk;
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UINT32 Pm1bEvtBlk;
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UINT32 Pm1aCntBlk;
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UINT32 Pm1bCntBlk;
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UINT32 Pm2CntBlk;
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UINT32 PmTmrBlk;
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UINT32 Gpe0Blk;
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UINT32 Gpe1Blk;
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UINT8 Pm1EvtLen;
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UINT8 Pm1CntLen;
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UINT8 Pm2CntLen;
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UINT8 PmTmLen;
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UINT8 Gpe0BlkLen;
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UINT8 Gpe1BlkLen;
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UINT8 Gpe1Base;
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UINT8 Reserved3;
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UINT16 PLvl2Lat;
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UINT16 PLvl3Lat;
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UINT16 FlushSize;
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UINT16 FlushStride;
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UINT8 DutyOffset;
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UINT8 DutyWidth;
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UINT8 DayAlrm;
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UINT8 MonAlrm;
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UINT8 Century;
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UINT8 Reserved4;
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UINT8 Reserved5;
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UINT8 Reserved6;
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UINT32 Flags;
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} EFI_ACPI_1_0_FIXED_ACPI_DESCRIPTION_TABLE;
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///
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/// FADT Version (as defined in ACPI 1.0b specification).
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///
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#define EFI_ACPI_1_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION 0x01
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#define EFI_ACPI_1_0_INT_MODE_DUAL_PIC 0
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#define EFI_ACPI_1_0_INT_MODE_MULTIPLE_APIC 1
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//
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// Fixed ACPI Description Table Fixed Feature Flags
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// All other bits are reserved and must be set to 0.
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//
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#define EFI_ACPI_1_0_WBINVD BIT0
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#define EFI_ACPI_1_0_WBINVD_FLUSH BIT1
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#define EFI_ACPI_1_0_PROC_C1 BIT2
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#define EFI_ACPI_1_0_P_LVL2_UP BIT3
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#define EFI_ACPI_1_0_PWR_BUTTON BIT4
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#define EFI_ACPI_1_0_SLP_BUTTON BIT5
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#define EFI_ACPI_1_0_FIX_RTC BIT6
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#define EFI_ACPI_1_0_RTC_S4 BIT7
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#define EFI_ACPI_1_0_TMR_VAL_EXT BIT8
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#define EFI_ACPI_1_0_DCK_CAP BIT9
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///
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/// Firmware ACPI Control Structure.
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///
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typedef struct {
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UINT32 Signature;
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UINT32 Length;
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UINT32 HardwareSignature;
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UINT32 FirmwareWakingVector;
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UINT32 GlobalLock;
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UINT32 Flags;
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UINT8 Reserved[40];
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} EFI_ACPI_1_0_FIRMWARE_ACPI_CONTROL_STRUCTURE;
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///
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/// Firmware Control Structure Feature Flags.
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/// All other bits are reserved and must be set to 0.
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///
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#define EFI_ACPI_1_0_S4BIOS_F BIT0
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///
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/// Multiple APIC Description Table header definition. The rest of the table
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/// must be defined in a platform-specific manner.
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///
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typedef struct {
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EFI_ACPI_DESCRIPTION_HEADER Header;
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UINT32 LocalApicAddress;
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UINT32 Flags;
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} EFI_ACPI_1_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER;
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///
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/// MADT Revision (as defined in ACPI 1.0b specification).
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///
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#define EFI_ACPI_1_0_MULTIPLE_APIC_DESCRIPTION_TABLE_REVISION 0x01
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///
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/// Multiple APIC Flags
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/// All other bits are reserved and must be set to 0.
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///
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#define EFI_ACPI_1_0_PCAT_COMPAT BIT0
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//
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// Multiple APIC Description Table APIC structure types
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// All other values between 0x05 an 0xFF are reserved and
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// will be ignored by OSPM.
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//
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#define EFI_ACPI_1_0_PROCESSOR_LOCAL_APIC 0x00
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#define EFI_ACPI_1_0_IO_APIC 0x01
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#define EFI_ACPI_1_0_INTERRUPT_SOURCE_OVERRIDE 0x02
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#define EFI_ACPI_1_0_NON_MASKABLE_INTERRUPT_SOURCE 0x03
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#define EFI_ACPI_1_0_LOCAL_APIC_NMI 0x04
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//
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// APIC Structure Definitions
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//
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///
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/// Processor Local APIC Structure Definition.
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///
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typedef struct {
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UINT8 Type;
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UINT8 Length;
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UINT8 AcpiProcessorId;
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UINT8 ApicId;
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UINT32 Flags;
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} EFI_ACPI_1_0_PROCESSOR_LOCAL_APIC_STRUCTURE;
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///
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/// Local APIC Flags. All other bits are reserved and must be 0.
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///
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#define EFI_ACPI_1_0_LOCAL_APIC_ENABLED BIT0
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///
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/// IO APIC Structure.
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///
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typedef struct {
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UINT8 Type;
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UINT8 Length;
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UINT8 IoApicId;
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UINT8 Reserved;
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UINT32 IoApicAddress;
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UINT32 SystemVectorBase;
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} EFI_ACPI_1_0_IO_APIC_STRUCTURE;
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///
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/// Interrupt Source Override Structure.
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///
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typedef struct {
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UINT8 Type;
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UINT8 Length;
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UINT8 Bus;
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UINT8 Source;
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UINT32 GlobalSystemInterruptVector;
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UINT16 Flags;
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} EFI_ACPI_1_0_INTERRUPT_SOURCE_OVERRIDE_STRUCTURE;
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///
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/// Non-Maskable Interrupt Source Structure.
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///
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typedef struct {
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UINT8 Type;
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UINT8 Length;
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UINT16 Flags;
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UINT32 GlobalSystemInterruptVector;
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} EFI_ACPI_1_0_NON_MASKABLE_INTERRUPT_SOURCE_STRUCTURE;
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///
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/// Local APIC NMI Structure.
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///
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typedef struct {
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UINT8 Type;
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UINT8 Length;
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UINT8 AcpiProcessorId;
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UINT16 Flags;
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UINT8 LocalApicInti;
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} EFI_ACPI_1_0_LOCAL_APIC_NMI_STRUCTURE;
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///
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/// Smart Battery Description Table (SBST)
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///
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typedef struct {
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EFI_ACPI_DESCRIPTION_HEADER Header;
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UINT32 WarningEnergyLevel;
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UINT32 LowEnergyLevel;
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UINT32 CriticalEnergyLevel;
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} EFI_ACPI_1_0_SMART_BATTERY_DESCRIPTION_TABLE;
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//
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// Known table signatures
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//
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///
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/// "RSD PTR " Root System Description Pointer.
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///
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#define EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_POINTER_SIGNATURE SIGNATURE_64('R', 'S', 'D', ' ', 'P', 'T', 'R', ' ')
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///
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/// "APIC" Multiple APIC Description Table.
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///
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#define EFI_ACPI_1_0_APIC_SIGNATURE SIGNATURE_32('A', 'P', 'I', 'C')
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///
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/// "DSDT" Differentiated System Description Table.
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///
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#define EFI_ACPI_1_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('D', 'S', 'D', 'T')
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///
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/// "FACS" Firmware ACPI Control Structure.
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///
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#define EFI_ACPI_1_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE SIGNATURE_32('F', 'A', 'C', 'S')
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///
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/// "FACP" Fixed ACPI Description Table.
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///
|
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#define EFI_ACPI_1_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('F', 'A', 'C', 'P')
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///
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/// "PSDT" Persistent System Description Table.
|
|
///
|
|
#define EFI_ACPI_1_0_PERSISTENT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('P', 'S', 'D', 'T')
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///
|
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/// "RSDT" Root System Description Table.
|
|
///
|
|
#define EFI_ACPI_1_0_ROOT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('R', 'S', 'D', 'T')
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///
|
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/// "SBST" Smart Battery Specification Table.
|
|
///
|
|
#define EFI_ACPI_1_0_SMART_BATTERY_SPECIFICATION_TABLE_SIGNATURE SIGNATURE_32('S', 'B', 'S', 'T')
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///
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/// "SSDT" Secondary System Description Table.
|
|
///
|
|
#define EFI_ACPI_1_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('S', 'S', 'D', 'T')
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#pragma pack()
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|
#endif
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