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   //
  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 ((EFI_D_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     BuildGuidDataHob (
  65       &gEfiVectorHandoffInfoPpiGuid,
  66       VectorHandoffInfoPpi->Info,
  67       sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
  68       );
  69   }
  70
  71   //
  72   // Allocate 128KB for the Stack
  73   //
  74   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  75   ASSERT (BaseOfStack != NULL);
  76
  77   //
  78   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  79   // for safety.
  80   //
  81   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  82   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  83
  84   PageTables = 0;
  85   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
  86     //
  87     // Create page table and save PageMapLevel4 to CR3
  88     //
  89     PageTables = CreateIdentityMappingPageTables ((EFI_PHYSICAL_ADDRESS) (UINTN) BaseOfStack, STACK_SIZE);
  90   } else {
  91     //
  92     // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
  93     // for the DxeIpl and the DxeCore are both X64.
  94     //
  95     ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
  96     ASSERT (PcdGetBool (PcdCpuStackGuard) == FALSE);
  97   }
  98
  99   //
 100   // End of PEI phase signal
 101   //
 102   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
 103   ASSERT_EFI_ERROR (Status);
 104
 105   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
 106     AsmWriteCr3 (PageTables);
 107   }
 108
 109   //
 110   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
 111   //
 112   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
 113
 114   //
 115   // Transfer the control to the entry point of DxeCore.
 116   //
 117   SwitchStack (
 118     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
 119     HobList.Raw,
 120     NULL,
 121     TopOfStack
 122     );
 123 }