diff --git a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf index 5c5f7e82a5..784fdf18f6 100644 --- a/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf +++ b/MdeModulePkg/Core/DxeIplPeim/DxeIpl.inf @@ -45,7 +45,7 @@ [Sources.X64] X64/VirtualMemory.h X64/VirtualMemory.c - X64/DxeLoadFunc.c + X64/DxeLoadFunc.c [Sources.IPF] Ipf/DxeLoadFunc.c @@ -90,6 +90,9 @@ [FeaturePcd.IA32] gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode +[FeaturePcd.X64] + gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplBuildPageTables + [FeaturePcd] gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSupportUefiDecompress diff --git a/MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c b/MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c index 1b12801d67..729e1ee325 100644 --- a/MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c +++ b/MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c @@ -52,18 +52,22 @@ HandOffToDxeCore ( TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT); TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT); - // - // Create page table and save PageMapLevel4 to CR3 - // - PageTables = CreateIdentityMappingPageTables (); - + if (FeaturePcdGet (PcdDxeIplBuildPageTables)) { + // + // Create page table and save PageMapLevel4 to CR3 + // + PageTables = CreateIdentityMappingPageTables (); + } + // // End of PEI phase signal // Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi); ASSERT_EFI_ERROR (Status); - AsmWriteCr3 (PageTables); + if (FeaturePcdGet (PcdDxeIplBuildPageTables)) { + AsmWriteCr3 (PageTables); + } // // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore. diff --git a/MdeModulePkg/MdeModulePkg.dec b/MdeModulePkg/MdeModulePkg.dec index 92e56ded55..a86a0462c4 100644 --- a/MdeModulePkg/MdeModulePkg.dec +++ b/MdeModulePkg/MdeModulePkg.dec @@ -364,6 +364,12 @@ # gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplSwitchToLongMode|TRUE|BOOLEAN|0x0001003b + ## + # This feature flag specifies whether DxeIpl should rebuild page tables. This flag only + # makes sense in the case where the DxeIpl and the DxeCore are both X64. + # + gEfiMdeModulePkgTokenSpaceGuid.PcdDxeIplBuildPageTables|TRUE|BOOLEAN|0x0001003c + [PcdsFixedAtBuild] ## Dynamic type PCD can be registered callback function for Pcd setting action. # PcdMaxPeiPcdCallBackNumberPerPcdEntry indicate maximum number of callback function