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