MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

   1 /** @file
   2   x64-specifc functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "DxeIpl.h"
  10 #include "X64/VirtualMemory.h"
  11
  12 /**
  13    Transfers control to DxeCore.
  14
  15    This function performs a CPU architecture specific operations to execute
  16    the entry point of DxeCore with the parameters of HobList.
  17    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  18
  19    @param DxeCoreEntryPoint         The entry point of DxeCore.
  20    @param HobList                   The start of HobList passed to DxeCore.
  21
  22 **/
  23 VOID
  24 HandOffToDxeCore (
  25   IN EFI_PHYSICAL_ADDRESS  DxeCoreEntryPoint,
  26   IN EFI_PEI_HOB_POINTERS  HobList
  27   )
  28 {
  29   VOID                             *BaseOfStack;
  30   VOID                             *TopOfStack;
  31   EFI_STATUS                       Status;
  32   UINTN                            PageTables;
  33   UINT32                           Index;
  34   EFI_VECTOR_HANDOFF_INFO          *VectorInfo;
  35   EFI_PEI_VECTOR_HANDOFF_INFO_PPI  *VectorHandoffInfoPpi;
  36   VOID                             *GhcbBase;
  37   UINTN                            GhcbSize;
  38
  39   //
  40   // Clear page 0 and mark it as allocated if NULL pointer detection is enabled.
  41   //
  42   if (IsNullDetectionEnabled ()) {
  43     ClearFirst4KPage (HobList.Raw);
  44     BuildMemoryAllocationHob (0, EFI_PAGES_TO_SIZE (1), EfiBootServicesData);
  45   }
  46
  47   //
  48   // Get Vector Hand-off Info PPI and build Guided HOB
  49   //
  50   Status = PeiServicesLocatePpi (
  51              &gEfiVectorHandoffInfoPpiGuid,
  52              0,
  53              NULL,
  54              (VOID **)&VectorHandoffInfoPpi
  55              );
  56   if (Status == EFI_SUCCESS) {
  57     DEBUG ((DEBUG_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));
  58     VectorInfo = VectorHandoffInfoPpi->Info;
  59     Index      = 1;
  60     while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {
  61       VectorInfo++;
  62       Index++;
  63     }
  64
  65     BuildGuidDataHob (
  66       &gEfiVectorHandoffInfoPpiGuid,
  67       VectorHandoffInfoPpi->Info,
  68       sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
  69       );
  70   }
  71
  72   //
  73   // Allocate 128KB for the Stack
  74   //
  75   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  76   ASSERT (BaseOfStack != NULL);
  77
  78   //
  79   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  80   // for safety.
  81   //
  82   TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  83   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  84
  85   //
  86   // Get the address and size of the GHCB pages
  87   //
  88   GhcbBase = (VOID *)PcdGet64 (PcdGhcbBase);
  89   GhcbSize = PcdGet64 (PcdGhcbSize);
  90
  91   PageTables = 0;
  92   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
  93     //
  94     // Create page table and save PageMapLevel4 to CR3
  95     //
  96     PageTables = CreateIdentityMappingPageTables (
  97                    (EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack,
  98                    STACK_SIZE,
  99                    (EFI_PHYSICAL_ADDRESS)(UINTN)GhcbBase,
 100                    GhcbSize
 101                    );
 102   } else {
 103     //
 104     // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
 105     // for the DxeIpl and the DxeCore are both X64.
 106     //
 107     ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
 108     ASSERT (PcdGetBool (PcdCpuStackGuard) == FALSE);
 109   }
 110
 111   //
 112   // End of PEI phase signal
 113   //
 114   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
 115   ASSERT_EFI_ERROR (Status);
 116
 117   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
 118     AsmWriteCr3 (PageTables);
 119   }
 120
 121   //
 122   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
 123   //
 124   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);
 125
 126   //
 127   // Transfer the control to the entry point of DxeCore.
 128   //
 129   SwitchStack (
 130     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
 131     HobList.Raw,
 132     NULL,
 133     TopOfStack
 134     );
 135 }