From 78a38b73c39569aacca5c7a4f44bb896305a301a Mon Sep 17 00:00:00 2001 From: Laszlo Ersek Date: Tue, 4 Mar 2014 08:02:52 +0000 Subject: [PATCH] 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 [jordan.l.justen@intel.com: Move to MemDetect.c; use PCDs] Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Jordan Justen Reviewed-by: Laszlo Ersek git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15298 6f19259b-4bc3-4df7-8a09-765794883524 --- OvmfPkg/PlatformPei/MemDetect.c | 14 ++++++++++++++ OvmfPkg/PlatformPei/PlatformPei.inf | 2 ++ 2 files changed, 16 insertions(+) diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetect.c index d35ee53c77..37030e6898 100644 --- a/OvmfPkg/PlatformPei/MemDetect.c +++ b/OvmfPkg/PlatformPei/MemDetect.c @@ -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 } } diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/PlatformPei.inf index b8b140b8c7..c91513882a 100644 --- a/OvmfPkg/PlatformPei/PlatformPei.inf +++ b/OvmfPkg/PlatformPei/PlatformPei.inf @@ -68,6 +68,8 @@ gUefiOvmfPkgTokenSpaceGuid.PcdS3AcpiReservedMemoryBase gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamBase gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPeiTempRamSize + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesBase + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecPageTablesSize gEfiIntelFrameworkModulePkgTokenSpaceGuid.PcdS3AcpiReservedMemorySize gEfiMdeModulePkgTokenSpaceGuid.PcdVariableStoreSize gEfiMdeModulePkgTokenSpaceGuid.PcdFlashNvStorageFtwSpareSize -- 2.39.2