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The ACPI specification v6.5, sTable 5.158: Processor Structure Flags states that: """ The processor container will have a matching ID value returned through the _UID method. As not every pro- cessor hierarchy node structure in PPTT may have a matching processor container, this flag indicates whether the ACPI pro- cessor ID points to valid entry. Where a valid entry is possible the ACPI Processor ID and _UID method are mandatory. """ And in: Table 5.157: Processor Hierarchy Node Structure """ If the processor structure rep- resents a group of associated processors, the structure might match a processor container in the name space. In that case this entry will match the value of the _UID method of the as- sociated processor container. Where there is a match it must be represented. The flags field, described in Processor Struc- ture Flags, includes a bit to describe whether the ACPI pro- cessor ID is valid. """ The DynamicTablesPkg currently creates a processor container: - in the SSDT CPU Topology generator, with the _HID=ACPI0010, and with a valid _UID - in the PPTT table for each CM_ARCH_COMMON_PROC_HIERARCHY_INFO structure. Thus: - all the processor containers should have the VALID bit set if the SSDT CPU Topology table is present. - if the SSDT CPU Topology table is present, but there is no PPTT table, then the state of the VALID bit is ignored. A contrario, an example where the VALID bit should not be set would be if: - the SSDT CPU Topology generator is absent - no processor container is created in the SSDT topology, i.e. if a flat hierarchy is created. Signed-off-by: Pierre Gondois <pierre.gondois@arm.com>
33 lines
723 B
INI
33 lines
723 B
INI
## @file
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# PPTT Table Generator
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#
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# Copyright (c) 2019, ARM Limited. All rights reserved.
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#
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# SPDX-License-Identifier: BSD-2-Clause-Patent
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##
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[Defines]
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INF_VERSION = 0x0001001B
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BASE_NAME = AcpiPpttLib
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FILE_GUID = FA102D52-5A92-4F95-A097-1D53F9CF5959
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VERSION_STRING = 1.0
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MODULE_TYPE = DXE_DRIVER
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LIBRARY_CLASS = NULL|DXE_DRIVER
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CONSTRUCTOR = AcpiPpttLibConstructor
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DESTRUCTOR = AcpiPpttLibDestructor
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[Sources]
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PpttGenerator.c
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PpttGenerator.h
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[Packages]
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EmbeddedPkg/EmbeddedPkg.dec
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DynamicTablesPkg/DynamicTablesPkg.dec
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MdeModulePkg/MdeModulePkg.dec
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MdePkg/MdePkg.dec
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[LibraryClasses]
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BaseLib
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CmObjHelperLib
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MetadataHandlerLib
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