5630cdfe9f
This feature is added for UEFI spec that says "Stack may be marked as non-executable in identity mapped page tables". A PCD PcdSetNxForStack is added to turn on/off this feature, and it is FALSE by default. Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: "Yao, Jiewen" <Jiewen.yao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18166 6f19259b-4bc3-4df7-8a09-765794883524
121 lines
3.6 KiB
C
121 lines
3.6 KiB
C
/** @file
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x64-specifc functionality for DxeLoad.
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Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this 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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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "DxeIpl.h"
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#include "X64/VirtualMemory.h"
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/**
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Transfers control to DxeCore.
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This function performs a CPU architecture specific operations to execute
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the entry point of DxeCore with the parameters of HobList.
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It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
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@param DxeCoreEntryPoint The entry point of DxeCore.
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@param HobList The start of HobList passed to DxeCore.
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**/
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VOID
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HandOffToDxeCore (
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IN EFI_PHYSICAL_ADDRESS DxeCoreEntryPoint,
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IN EFI_PEI_HOB_POINTERS HobList
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)
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{
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VOID *BaseOfStack;
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VOID *TopOfStack;
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EFI_STATUS Status;
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UINTN PageTables;
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UINT32 Index;
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EFI_VECTOR_HANDOFF_INFO *VectorInfo;
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EFI_PEI_VECTOR_HANDOFF_INFO_PPI *VectorHandoffInfoPpi;
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//
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// Get Vector Hand-off Info PPI and build Guided HOB
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//
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Status = PeiServicesLocatePpi (
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&gEfiVectorHandoffInfoPpiGuid,
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0,
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NULL,
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(VOID **)&VectorHandoffInfoPpi
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);
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if (Status == EFI_SUCCESS) {
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DEBUG ((EFI_D_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));
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VectorInfo = VectorHandoffInfoPpi->Info;
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Index = 1;
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while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {
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VectorInfo ++;
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Index ++;
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}
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BuildGuidDataHob (
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&gEfiVectorHandoffInfoPpiGuid,
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VectorHandoffInfoPpi->Info,
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sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
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);
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}
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//
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// Allocate 128KB for the Stack
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//
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BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
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ASSERT (BaseOfStack != NULL);
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//
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// Compute the top of the stack we were allocated. Pre-allocate a UINTN
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// for safety.
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//
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TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
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TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
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PageTables = 0;
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if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
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//
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// Create page table and save PageMapLevel4 to CR3
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//
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PageTables = CreateIdentityMappingPageTables ((EFI_PHYSICAL_ADDRESS) (UINTN) BaseOfStack, STACK_SIZE);
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} else {
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//
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// Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
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// for the DxeIpl and the DxeCore are both X64.
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//
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ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
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}
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//
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// End of PEI phase signal
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//
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Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
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ASSERT_EFI_ERROR (Status);
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if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
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AsmWriteCr3 (PageTables);
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}
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//
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// Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
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//
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UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
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//
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// Transfer the control to the entry point of DxeCore.
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//
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SwitchStack (
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(SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
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HobList.Raw,
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NULL,
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TopOfStack
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);
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}
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