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OvmfPkg: PlatformPei: reserve early page tables on X64 

On X64, the reset vector code in
"OvmfPkg/ResetVector/Ia32/PageTables64.asm" identity maps the first 4GB of
RAM for PEI, consuming six frames starting at 8MB.

This range is declared by the PcdOvmfSecPageTablesBase/Size PCDs.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
[jordan.l.justen@intel.com: Move to MemDetect.c; use PCDs]
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15298 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Laszlo Ersek 2014-03-04 08:02:52 +00:00 committed by jljusten
parent e249f906f1
commit 78a38b73c3
2 changed files with 16 additions and 0 deletions
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14
OvmfPkg/PlatformPei/MemDetect.c
View File

@ -203,5 +203,19 @@ InitializeRamRegions (
PcdGet32 (PcdOvmfSecPeiTempRamSize),
EfiACPIMemoryNVS
);
#ifdef MDE_CPU_X64
//
// Reserve the initial page tables built by the reset vector code.
//
// Since this memory range will be used by the Reset Vector on S3
// resume, it must be reserved as ACPI NVS.
//
BuildMemoryAllocationHob (
(EFI_PHYSICAL_ADDRESS)(UINTN) PcdGet32 (PcdOvmfSecPageTablesBase),
(UINT64)(UINTN) PcdGet32 (PcdOvmfSecPageTablesSize),
EfiACPIMemoryNVS
);
#endif
}
}

2
OvmfPkg/PlatformPei/PlatformPei.inf
View File

@ -68,6 +68,8 @@
gUefiOvmfPkgTokenSpaceGuid.PcdS3AcpiReservedMemoryBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize
gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdS3AcpiReservedMemorySize
gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize
gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize