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
  39   if (IsNullDetectionEnabled ()) {
  40     ClearFirst4KPage (HobList.Raw);
  41   }
  42
  43   //
  44   // Get Vector Hand-off Info PPI and build Guided HOB
  45   //
  46   Status = PeiServicesLocatePpi (
  47              &gEfiVectorHandoffInfoPpiGuid,
  48              0,
  49              NULL,
  50              (VOID **)&VectorHandoffInfoPpi
  51              );
  52   if (Status == EFI_SUCCESS) {
  53     DEBUG ((EFI_D_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));
  54     VectorInfo = VectorHandoffInfoPpi->Info;
  55     Index = 1;
  56     while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {
  57       VectorInfo ++;
  58       Index ++;
  59     }
  60     BuildGuidDataHob (
  61       &gEfiVectorHandoffInfoPpiGuid,
  62       VectorHandoffInfoPpi->Info,
  63       sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
  64       );
  65   }
  66
  67   //
  68   // Allocate 128KB for the Stack
  69   //
  70   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  71   ASSERT (BaseOfStack != NULL);
  72
  73   //
  74   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  75   // for safety.
  76   //
  77   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  78   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  79
  80   PageTables = 0;
  81   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
  82     //
  83     // Create page table and save PageMapLevel4 to CR3
  84     //
  85     PageTables = CreateIdentityMappingPageTables ((EFI_PHYSICAL_ADDRESS) (UINTN) BaseOfStack, STACK_SIZE);
  86   } else {
  87     //
  88     // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
  89     // for the DxeIpl and the DxeCore are both X64.
  90     //
  91     ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
  92     ASSERT (PcdGetBool (PcdCpuStackGuard) == FALSE);
  93   }
  94
  95   //
  96   // End of PEI phase signal
  97   //
  98   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  99   ASSERT_EFI_ERROR (Status);
 100
 101   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
 102     AsmWriteCr3 (PageTables);
 103   }
 104
 105   //
 106   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
 107   //
 108   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
 109
 110   //
 111   // Transfer the control to the entry point of DxeCore.
 112   //
 113   SwitchStack (
 114     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
 115     HobList.Raw,
 116     NULL,
 117     TopOfStack
 118     );
 119 }