1372f8d347
In one of the next patches we'll turn PcdQ35TsegMbytes into a dynamic PCD, to be set by PlatformPei. Jordan suggested to use gEfiPeiMemoryDiscoveredPpiGuid as SmmAccessPei's DEPEX for making sure that PlatformPei sets the PCD before SmmAccessPei consumes it. (PlatformPei installs the permanent PEI RAM.) Such a DEPEX is supposed to mirror physical firmware, where anything related to SMRAM cannot run before said platform's physical RAM is discovered (signaled by the presence of gEfiPeiMemoryDiscoveredPpiGuid). Introduce the InitQ35TsegMbytes() function and the "mQ35TsegMbytes" extern variable to "SmramInternal.h" and "SmramInternal.c": - Both SmmAccess modules (PEIM and DXE driver) are supposed to call InitQ35TsegMbytes() in their respective entry point functions, saving PcdQ35TsegMbytes into "mQ35TsegMbytes". This way dynamic PCD fetches can be kept out of PEI_SMM_ACCESS_PPI and EFI_SMM_ACCESS2_PROTOCOL member functions later (when we add support for extended TSEG size). - We can thus replace the current PcdQ35TsegMbytes fetches in SmmAccessPei's entry point function as well, with reads from "mQ35TsegMbytes". Cc: Jordan Justen <jordan.l.justen@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
70 lines
1.8 KiB
INI
70 lines
1.8 KiB
INI
## @file
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# A PEIM with the following responsibilities:
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#
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# - provide SMRAM access by producing PEI_SMM_ACCESS_PPI,
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# - verify & configure the Q35 TSEG in the entry point,
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# - set aside the SMM_S3_RESUME_STATE object at the bottom of TSEG, and expose
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# it via the gEfiAcpiVariableGuid GUIDed HOB.
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#
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# Copyright (C) 2013, 2015, Red Hat, Inc.
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#
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# This program and the accompanying materials are licensed and made available
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# under the terms and conditions of the BSD License which accompanies this
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# distribution. The full text of the license may be found at
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# http://opensource.org/licenses/bsd-license.php
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#
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# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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# WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#
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##
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[Defines]
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INF_VERSION = 0x00010005
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BASE_NAME = SmmAccessPei
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FILE_GUID = 6C0E75B4-B0B9-44D1-8210-3377D7B4E066
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MODULE_TYPE = PEIM
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VERSION_STRING = 1.0
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ENTRY_POINT = SmmAccessPeiEntryPoint
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#
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# The following information is for reference only and not required by the build tools.
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#
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# VALID_ARCHITECTURES = IA32 X64
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#
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[Sources]
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SmmAccessPei.c
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SmramInternal.c
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SmramInternal.h
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[Packages]
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MdeModulePkg/MdeModulePkg.dec
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MdePkg/MdePkg.dec
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OvmfPkg/OvmfPkg.dec
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[Guids]
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gEfiAcpiVariableGuid
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[LibraryClasses]
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BaseLib
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BaseMemoryLib
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DebugLib
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HobLib
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IoLib
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PcdLib
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PciLib
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PeiServicesLib
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PeimEntryPoint
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[FeaturePcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire
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[Pcd]
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gUefiOvmfPkgTokenSpaceGuid.PcdQ35TsegMbytes
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[Ppis]
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gPeiSmmAccessPpiGuid ## PRODUCES
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[Depex]
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gEfiPeiMemoryDiscoveredPpiGuid
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