2 ACPI 3.0 definitions from the ACPI Specification Revision 3.0b October 10, 2006
4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
5 SPDX-License-Identifier: BSD-2-Clause-Patent
11 #include <IndustryStandard/Acpi20.h>
14 // Define for Descriptor
16 #define ACPI_LARGE_EXTENDED_ADDRESS_SPACE_DESCRIPTOR_NAME 0x0B
18 #define ACPI_EXTENDED_ADDRESS_SPACE_DESCRIPTOR 0x8B
21 // Ensure proper structure formats
26 /// Extended Address Space Descriptor
28 typedef PACKED
struct {
29 ACPI_LARGE_RESOURCE_HEADER Header
;
35 UINT64 AddrSpaceGranularity
;
38 UINT64 AddrTranslationOffset
;
40 UINT64 TypeSpecificAttribute
;
41 } EFI_ACPI_EXTENDED_ADDRESS_SPACE_DESCRIPTOR
;
46 // Memory Type Specific Flags
48 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_UC 0x0000000000000001
49 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_WC 0x0000000000000002
50 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_WT 0x0000000000000004
51 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_WB 0x0000000000000008
52 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_UCE 0x0000000000000010
53 #define EFI_ACPI_MEMORY_TYPE_SPECIFIC_ATTRIBUTES_NV 0x0000000000008000
56 // Ensure proper structure formats
61 /// ACPI 3.0 Generic Address Space definition
65 UINT8 RegisterBitWidth
;
66 UINT8 RegisterBitOffset
;
69 } EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE
;
72 // Generic Address Space Address IDs
74 #define EFI_ACPI_3_0_SYSTEM_MEMORY 0
75 #define EFI_ACPI_3_0_SYSTEM_IO 1
76 #define EFI_ACPI_3_0_PCI_CONFIGURATION_SPACE 2
77 #define EFI_ACPI_3_0_EMBEDDED_CONTROLLER 3
78 #define EFI_ACPI_3_0_SMBUS 4
79 #define EFI_ACPI_3_0_FUNCTIONAL_FIXED_HARDWARE 0x7F
82 // Generic Address Space Access Sizes
84 #define EFI_ACPI_3_0_UNDEFINED 0
85 #define EFI_ACPI_3_0_BYTE 1
86 #define EFI_ACPI_3_0_WORD 2
87 #define EFI_ACPI_3_0_DWORD 3
88 #define EFI_ACPI_3_0_QWORD 4
91 // ACPI 3.0 table structures
95 /// Root System Description Pointer Structure
105 UINT8 ExtendedChecksum
;
107 } EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER
;
110 /// RSD_PTR Revision (as defined in ACPI 3.0b spec.)
112 #define EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER_REVISION 0x02 ///< ACPISpec (Revision 3.0b) says current value is 2
115 /// Common table header, this prefaces all ACPI tables, including FACS, but
116 /// excluding the RSD PTR structure
121 } EFI_ACPI_3_0_COMMON_HEADER
;
124 // Root System Description Table
125 // No definition needed as it is a common description table header, the same with
126 // EFI_ACPI_DESCRIPTION_HEADER, followed by a variable number of UINT32 table pointers.
130 /// RSDT Revision (as defined in ACPI 3.0 spec.)
132 #define EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_TABLE_REVISION 0x01
135 // Extended System Description Table
136 // No definition needed as it is a common description table header, the same with
137 // EFI_ACPI_DESCRIPTION_HEADER, followed by a variable number of UINT64 table pointers.
141 /// XSDT Revision (as defined in ACPI 3.0 spec.)
143 #define EFI_ACPI_3_0_EXTENDED_SYSTEM_DESCRIPTION_TABLE_REVISION 0x01
146 /// Fixed ACPI Description Table Structure (FADT)
149 EFI_ACPI_DESCRIPTION_HEADER Header
;
153 UINT8 PreferredPmProfile
;
188 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE ResetReg
;
191 UINT64 XFirmwareCtrl
;
193 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPm1aEvtBlk
;
194 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPm1bEvtBlk
;
195 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPm1aCntBlk
;
196 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPm1bCntBlk
;
197 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPm2CntBlk
;
198 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XPmTmrBlk
;
199 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XGpe0Blk
;
200 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE XGpe1Blk
;
201 } EFI_ACPI_3_0_FIXED_ACPI_DESCRIPTION_TABLE
;
204 /// FADT Version (as defined in ACPI 3.0 spec.)
206 #define EFI_ACPI_3_0_FIXED_ACPI_DESCRIPTION_TABLE_REVISION 0x04
209 // Fixed ACPI Description Table Preferred Power Management Profile
211 #define EFI_ACPI_3_0_PM_PROFILE_UNSPECIFIED 0
212 #define EFI_ACPI_3_0_PM_PROFILE_DESKTOP 1
213 #define EFI_ACPI_3_0_PM_PROFILE_MOBILE 2
214 #define EFI_ACPI_3_0_PM_PROFILE_WORKSTATION 3
215 #define EFI_ACPI_3_0_PM_PROFILE_ENTERPRISE_SERVER 4
216 #define EFI_ACPI_3_0_PM_PROFILE_SOHO_SERVER 5
217 #define EFI_ACPI_3_0_PM_PROFILE_APPLIANCE_PC 6
218 #define EFI_ACPI_3_0_PM_PROFILE_PERFORMANCE_SERVER 7
221 // Fixed ACPI Description Table Boot Architecture Flags
222 // All other bits are reserved and must be set to 0.
224 #define EFI_ACPI_3_0_LEGACY_DEVICES BIT0
225 #define EFI_ACPI_3_0_8042 BIT1
226 #define EFI_ACPI_3_0_VGA_NOT_PRESENT BIT2
227 #define EFI_ACPI_3_0_MSI_NOT_SUPPORTED BIT3
228 #define EFI_ACPI_3_0_PCIE_ASPM_CONTROLS BIT4
231 // Fixed ACPI Description Table Fixed Feature Flags
232 // All other bits are reserved and must be set to 0.
234 #define EFI_ACPI_3_0_WBINVD BIT0
235 #define EFI_ACPI_3_0_WBINVD_FLUSH BIT1
236 #define EFI_ACPI_3_0_PROC_C1 BIT2
237 #define EFI_ACPI_3_0_P_LVL2_UP BIT3
238 #define EFI_ACPI_3_0_PWR_BUTTON BIT4
239 #define EFI_ACPI_3_0_SLP_BUTTON BIT5
240 #define EFI_ACPI_3_0_FIX_RTC BIT6
241 #define EFI_ACPI_3_0_RTC_S4 BIT7
242 #define EFI_ACPI_3_0_TMR_VAL_EXT BIT8
243 #define EFI_ACPI_3_0_DCK_CAP BIT9
244 #define EFI_ACPI_3_0_RESET_REG_SUP BIT10
245 #define EFI_ACPI_3_0_SEALED_CASE BIT11
246 #define EFI_ACPI_3_0_HEADLESS BIT12
247 #define EFI_ACPI_3_0_CPU_SW_SLP BIT13
248 #define EFI_ACPI_3_0_PCI_EXP_WAK BIT14
249 #define EFI_ACPI_3_0_USE_PLATFORM_CLOCK BIT15
250 #define EFI_ACPI_3_0_S4_RTC_STS_VALID BIT16
251 #define EFI_ACPI_3_0_REMOTE_POWER_ON_CAPABLE BIT17
252 #define EFI_ACPI_3_0_FORCE_APIC_CLUSTER_MODEL BIT18
253 #define EFI_ACPI_3_0_FORCE_APIC_PHYSICAL_DESTINATION_MODE BIT19
256 /// Firmware ACPI Control Structure
261 UINT32 HardwareSignature
;
262 UINT32 FirmwareWakingVector
;
265 UINT64 XFirmwareWakingVector
;
268 } EFI_ACPI_3_0_FIRMWARE_ACPI_CONTROL_STRUCTURE
;
271 /// FACS Version (as defined in ACPI 3.0 spec.)
273 #define EFI_ACPI_3_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_VERSION 0x01
276 /// Firmware Control Structure Feature Flags
277 /// All other bits are reserved and must be set to 0.
279 #define EFI_ACPI_3_0_S4BIOS_F BIT0
282 // Differentiated System Description Table,
283 // Secondary System Description Table
284 // and Persistent System Description Table,
285 // no definition needed as they are common description table header, the same with
286 // EFI_ACPI_DESCRIPTION_HEADER, followed by a definition block.
288 #define EFI_ACPI_3_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_REVISION 0x02
289 #define EFI_ACPI_3_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_REVISION 0x02
292 /// Multiple APIC Description Table header definition. The rest of the table
293 /// must be defined in a platform specific manner.
296 EFI_ACPI_DESCRIPTION_HEADER Header
;
297 UINT32 LocalApicAddress
;
299 } EFI_ACPI_3_0_MULTIPLE_APIC_DESCRIPTION_TABLE_HEADER
;
302 /// MADT Revision (as defined in ACPI 3.0 spec.)
304 #define EFI_ACPI_3_0_MULTIPLE_APIC_DESCRIPTION_TABLE_REVISION 0x02
307 /// Multiple APIC Flags
308 /// All other bits are reserved and must be set to 0.
310 #define EFI_ACPI_3_0_PCAT_COMPAT BIT0
313 // Multiple APIC Description Table APIC structure types
314 // All other values between 0x09 an 0xFF are reserved and
315 // will be ignored by OSPM.
317 #define EFI_ACPI_3_0_PROCESSOR_LOCAL_APIC 0x00
318 #define EFI_ACPI_3_0_IO_APIC 0x01
319 #define EFI_ACPI_3_0_INTERRUPT_SOURCE_OVERRIDE 0x02
320 #define EFI_ACPI_3_0_NON_MASKABLE_INTERRUPT_SOURCE 0x03
321 #define EFI_ACPI_3_0_LOCAL_APIC_NMI 0x04
322 #define EFI_ACPI_3_0_LOCAL_APIC_ADDRESS_OVERRIDE 0x05
323 #define EFI_ACPI_3_0_IO_SAPIC 0x06
324 #define EFI_ACPI_3_0_LOCAL_SAPIC 0x07
325 #define EFI_ACPI_3_0_PLATFORM_INTERRUPT_SOURCES 0x08
328 // APIC Structure Definitions
332 /// Processor Local APIC Structure Definition
337 UINT8 AcpiProcessorId
;
340 } EFI_ACPI_3_0_PROCESSOR_LOCAL_APIC_STRUCTURE
;
343 /// Local APIC Flags. All other bits are reserved and must be 0.
345 #define EFI_ACPI_3_0_LOCAL_APIC_ENABLED BIT0
348 /// IO APIC Structure
355 UINT32 IoApicAddress
;
356 UINT32 GlobalSystemInterruptBase
;
357 } EFI_ACPI_3_0_IO_APIC_STRUCTURE
;
360 /// Interrupt Source Override Structure
367 UINT32 GlobalSystemInterrupt
;
369 } EFI_ACPI_3_0_INTERRUPT_SOURCE_OVERRIDE_STRUCTURE
;
372 /// Platform Interrupt Sources Structure Definition
382 UINT32 GlobalSystemInterrupt
;
383 UINT32 PlatformInterruptSourceFlags
;
384 UINT8 CpeiProcessorOverride
;
386 } EFI_ACPI_3_0_PLATFORM_INTERRUPT_APIC_STRUCTURE
;
390 // All other bits are reserved and must be set to 0.
392 #define EFI_ACPI_3_0_POLARITY (3 << 0)
393 #define EFI_ACPI_3_0_TRIGGER_MODE (3 << 2)
396 /// Non-Maskable Interrupt Source Structure
402 UINT32 GlobalSystemInterrupt
;
403 } EFI_ACPI_3_0_NON_MASKABLE_INTERRUPT_SOURCE_STRUCTURE
;
406 /// Local APIC NMI Structure
411 UINT8 AcpiProcessorId
;
414 } EFI_ACPI_3_0_LOCAL_APIC_NMI_STRUCTURE
;
417 /// Local APIC Address Override Structure
423 UINT64 LocalApicAddress
;
424 } EFI_ACPI_3_0_LOCAL_APIC_ADDRESS_OVERRIDE_STRUCTURE
;
427 /// IO SAPIC Structure
434 UINT32 GlobalSystemInterruptBase
;
435 UINT64 IoSapicAddress
;
436 } EFI_ACPI_3_0_IO_SAPIC_STRUCTURE
;
439 /// Local SAPIC Structure
440 /// This struct followed by a null-terminated ASCII string - ACPI Processor UID String
445 UINT8 AcpiProcessorId
;
450 UINT32 ACPIProcessorUIDValue
;
451 } EFI_ACPI_3_0_PROCESSOR_LOCAL_SAPIC_STRUCTURE
;
454 /// Platform Interrupt Sources Structure
464 UINT32 GlobalSystemInterrupt
;
465 UINT32 PlatformInterruptSourceFlags
;
466 } EFI_ACPI_3_0_PLATFORM_INTERRUPT_SOURCES_STRUCTURE
;
469 /// Platform Interrupt Source Flags.
470 /// All other bits are reserved and must be set to 0.
472 #define EFI_ACPI_3_0_CPEI_PROCESSOR_OVERRIDE BIT0
475 /// Smart Battery Description Table (SBST)
478 EFI_ACPI_DESCRIPTION_HEADER Header
;
479 UINT32 WarningEnergyLevel
;
480 UINT32 LowEnergyLevel
;
481 UINT32 CriticalEnergyLevel
;
482 } EFI_ACPI_3_0_SMART_BATTERY_DESCRIPTION_TABLE
;
485 /// SBST Version (as defined in ACPI 3.0 spec.)
487 #define EFI_ACPI_3_0_SMART_BATTERY_DESCRIPTION_TABLE_REVISION 0x01
490 /// Embedded Controller Boot Resources Table (ECDT)
491 /// The table is followed by a null terminated ASCII string that contains
492 /// a fully qualified reference to the name space object.
495 EFI_ACPI_DESCRIPTION_HEADER Header
;
496 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE EcControl
;
497 EFI_ACPI_3_0_GENERIC_ADDRESS_STRUCTURE EcData
;
500 } EFI_ACPI_3_0_EMBEDDED_CONTROLLER_BOOT_RESOURCES_TABLE
;
503 /// ECDT Version (as defined in ACPI 3.0 spec.)
505 #define EFI_ACPI_3_0_EMBEDDED_CONTROLLER_BOOT_RESOURCES_TABLE_REVISION 0x01
508 /// System Resource Affinity Table (SRAT. The rest of the table
509 /// must be defined in a platform specific manner.
512 EFI_ACPI_DESCRIPTION_HEADER Header
;
513 UINT32 Reserved1
; ///< Must be set to 1
515 } EFI_ACPI_3_0_SYSTEM_RESOURCE_AFFINITY_TABLE_HEADER
;
518 /// SRAT Version (as defined in ACPI 3.0 spec.)
520 #define EFI_ACPI_3_0_SYSTEM_RESOURCE_AFFINITY_TABLE_REVISION 0x02
523 // SRAT structure types.
524 // All other values between 0x02 an 0xFF are reserved and
525 // will be ignored by OSPM.
527 #define EFI_ACPI_3_0_PROCESSOR_LOCAL_APIC_SAPIC_AFFINITY 0x00
528 #define EFI_ACPI_3_0_MEMORY_AFFINITY 0x01
531 /// Processor Local APIC/SAPIC Affinity Structure Definition
536 UINT8 ProximityDomain7To0
;
540 UINT8 ProximityDomain31To8
[3];
542 } EFI_ACPI_3_0_PROCESSOR_LOCAL_APIC_SAPIC_AFFINITY_STRUCTURE
;
545 /// Local APIC/SAPIC Flags. All other bits are reserved and must be 0.
547 #define EFI_ACPI_3_0_PROCESSOR_LOCAL_APIC_SAPIC_ENABLED (1 << 0)
550 /// Memory Affinity Structure Definition
555 UINT32 ProximityDomain
;
557 UINT32 AddressBaseLow
;
558 UINT32 AddressBaseHigh
;
564 } EFI_ACPI_3_0_MEMORY_AFFINITY_STRUCTURE
;
567 // Memory Flags. All other bits are reserved and must be 0.
569 #define EFI_ACPI_3_0_MEMORY_ENABLED (1 << 0)
570 #define EFI_ACPI_3_0_MEMORY_HOT_PLUGGABLE (1 << 1)
571 #define EFI_ACPI_3_0_MEMORY_NONVOLATILE (1 << 2)
574 /// System Locality Distance Information Table (SLIT).
575 /// The rest of the table is a matrix.
578 EFI_ACPI_DESCRIPTION_HEADER Header
;
579 UINT64 NumberOfSystemLocalities
;
580 } EFI_ACPI_3_0_SYSTEM_LOCALITY_DISTANCE_INFORMATION_TABLE_HEADER
;
583 /// SLIT Version (as defined in ACPI 3.0 spec.)
585 #define EFI_ACPI_3_0_SYSTEM_LOCALITY_DISTANCE_INFORMATION_TABLE_REVISION 0x01
588 // Known table signatures
592 /// "RSD PTR " Root System Description Pointer
594 #define EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_POINTER_SIGNATURE SIGNATURE_64('R', 'S', 'D', ' ', 'P', 'T', 'R', ' ')
597 /// "APIC" Multiple APIC Description Table
599 #define EFI_ACPI_3_0_MULTIPLE_APIC_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('A', 'P', 'I', 'C')
602 /// "DSDT" Differentiated System Description Table
604 #define EFI_ACPI_3_0_DIFFERENTIATED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('D', 'S', 'D', 'T')
607 /// "ECDT" Embedded Controller Boot Resources Table
609 #define EFI_ACPI_3_0_EMBEDDED_CONTROLLER_BOOT_RESOURCES_TABLE_SIGNATURE SIGNATURE_32('E', 'C', 'D', 'T')
612 /// "FACP" Fixed ACPI Description Table
614 #define EFI_ACPI_3_0_FIXED_ACPI_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('F', 'A', 'C', 'P')
617 /// "FACS" Firmware ACPI Control Structure
619 #define EFI_ACPI_3_0_FIRMWARE_ACPI_CONTROL_STRUCTURE_SIGNATURE SIGNATURE_32('F', 'A', 'C', 'S')
622 /// "PSDT" Persistent System Description Table
624 #define EFI_ACPI_3_0_PERSISTENT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('P', 'S', 'D', 'T')
627 /// "RSDT" Root System Description Table
629 #define EFI_ACPI_3_0_ROOT_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('R', 'S', 'D', 'T')
632 /// "SBST" Smart Battery Specification Table
634 #define EFI_ACPI_3_0_SMART_BATTERY_SPECIFICATION_TABLE_SIGNATURE SIGNATURE_32('S', 'B', 'S', 'T')
637 /// "SLIT" System Locality Information Table
639 #define EFI_ACPI_3_0_SYSTEM_LOCALITY_INFORMATION_TABLE_SIGNATURE SIGNATURE_32('S', 'L', 'I', 'T')
642 /// "SRAT" System Resource Affinity Table
644 #define EFI_ACPI_3_0_SYSTEM_RESOURCE_AFFINITY_TABLE_SIGNATURE SIGNATURE_32('S', 'R', 'A', 'T')
647 /// "SSDT" Secondary System Description Table
649 #define EFI_ACPI_3_0_SECONDARY_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('S', 'S', 'D', 'T')
652 /// "XSDT" Extended System Description Table
654 #define EFI_ACPI_3_0_EXTENDED_SYSTEM_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('X', 'S', 'D', 'T')
657 /// "BOOT" MS Simple Boot Spec
659 #define EFI_ACPI_3_0_SIMPLE_BOOT_FLAG_TABLE_SIGNATURE SIGNATURE_32('B', 'O', 'O', 'T')
662 /// "CPEP" Corrected Platform Error Polling Table
664 #define EFI_ACPI_3_0_CORRECTED_PLATFORM_ERROR_POLLING_TABLE_SIGNATURE SIGNATURE_32('C', 'P', 'E', 'P')
667 /// "DBGP" MS Debug Port Spec
669 #define EFI_ACPI_3_0_DEBUG_PORT_TABLE_SIGNATURE SIGNATURE_32('D', 'B', 'G', 'P')
672 /// "ETDT" Event Timer Description Table
674 #define EFI_ACPI_3_0_EVENT_TIMER_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('E', 'T', 'D', 'T')
677 /// "HPET" IA-PC High Precision Event Timer Table
679 #define EFI_ACPI_3_0_HIGH_PRECISION_EVENT_TIMER_TABLE_SIGNATURE SIGNATURE_32('H', 'P', 'E', 'T')
682 /// "MCFG" PCI Express Memory Mapped Configuration Space Base Address Description Table
684 #define EFI_ACPI_3_0_PCI_EXPRESS_MEMORY_MAPPED_CONFIGURATION_SPACE_BASE_ADDRESS_DESCRIPTION_TABLE_SIGNATURE SIGNATURE_32('M', 'C', 'F', 'G')
687 /// "SPCR" Serial Port Console Redirection Table
689 #define EFI_ACPI_3_0_SERIAL_PORT_CONSOLE_REDIRECTION_TABLE_SIGNATURE SIGNATURE_32('S', 'P', 'C', 'R')
692 /// "SPMI" Server Platform Management Interface Table
694 #define EFI_ACPI_3_0_SERVER_PLATFORM_MANAGEMENT_INTERFACE_TABLE_SIGNATURE SIGNATURE_32('S', 'P', 'M', 'I')
697 /// "TCPA" Trusted Computing Platform Alliance Capabilities Table
699 #define EFI_ACPI_3_0_TRUSTED_COMPUTING_PLATFORM_ALLIANCE_CAPABILITIES_TABLE_SIGNATURE SIGNATURE_32('T', 'C', 'P', 'A')
702 /// "WDRT" Watchdog Resource Table
704 #define EFI_ACPI_3_0_WATCHDOG_RESOURCE_TABLE_SIGNATURE SIGNATURE_32('W', 'D', 'R', 'T')
707 /// "WDAT" Watchdog Action Table
709 #define EFI_ACPI_3_0_WATCHDOG_ACTION_TABLE_SIGNATURE SIGNATURE_32('W', 'D', 'A', 'T')
712 /// "WSPT" Windows Specific Properties Table
714 #define EFI_ACPI_3_0_WINDOWS_SPECIFIC_PROPERTIES_TABLE_SIGNATURE SIGNATURE_32('W', 'S', 'P', 'T')
717 /// "iBFT" iSCSI Boot Firmware Table
719 #define EFI_ACPI_3_0_ISCSI_BOOT_FIRMWARE_TABLE_SIGNATURE SIGNATURE_32('i', 'B', 'F', 'T')