MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

   1 /** @file
   2   x64-specifc functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
   5 This program and the accompanying materials
   6 are licensed and made available under the terms and conditions of the BSD License
   7 which accompanies this distribution.  The full text of the license may be found at
   8 http://opensource.org/licenses/bsd-license.php
   9
  10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  12
  13 **/
  14
  15 #include "DxeIpl.h"
  16 #include "X64/VirtualMemory.h"
  17
  18
  19
  20 /**
  21    Transfers control to DxeCore.
  22
  23    This function performs a CPU architecture specific operations to execute
  24    the entry point of DxeCore with the parameters of HobList.
  25    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  26
  27    @param DxeCoreEntryPoint         The entry point of DxeCore.
  28    @param HobList                   The start of HobList passed to DxeCore.
  29
  30 **/
  31 VOID
  32 HandOffToDxeCore (
  33   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  34   IN EFI_PEI_HOB_POINTERS   HobList
  35   )
  36 {
  37   VOID                            *BaseOfStack;
  38   VOID                            *TopOfStack;
  39   EFI_STATUS                      Status;
  40   UINTN                           PageTables;
  41   UINT32                          Index;
  42   EFI_VECTOR_HANDOFF_INFO         *VectorInfo;
  43   EFI_PEI_VECTOR_HANDOFF_INFO_PPI *VectorHandoffInfoPpi;
  44
  45   //
  46   // Get Vector Hand-off Info PPI and build Guided HOB
  47   //
  48   Status = PeiServicesLocatePpi (
  49              &gEfiVectorHandoffInfoPpiGuid,
  50              0,
  51              NULL,
  52              (VOID **)&VectorHandoffInfoPpi
  53              );
  54   if (Status == EFI_SUCCESS) {
  55     DEBUG ((EFI_D_INFO, "Vector Hand-off Info PPI is gotten, GUIDed HOB is created!\n"));
  56     VectorInfo = VectorHandoffInfoPpi->Info;
  57     Index = 1;
  58     while (VectorInfo->Attribute != EFI_VECTOR_HANDOFF_LAST_ENTRY) {
  59       VectorInfo ++;
  60       Index ++;
  61     }
  62     BuildGuidDataHob (
  63       &gEfiVectorHandoffInfoPpiGuid,
  64       VectorHandoffInfoPpi->Info,
  65       sizeof (EFI_VECTOR_HANDOFF_INFO) * Index
  66       );
  67   }
  68
  69   //
  70   // Allocate 128KB for the Stack
  71   //
  72   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  73   ASSERT (BaseOfStack != NULL);
  74
  75   //
  76   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  77   // for safety.
  78   //
  79   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  80   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  81
  82   PageTables = 0;
  83   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
  84     //
  85     // Create page table and save PageMapLevel4 to CR3
  86     //
  87     PageTables = CreateIdentityMappingPageTables ((EFI_PHYSICAL_ADDRESS) (UINTN) BaseOfStack, STACK_SIZE);
  88   } else {
  89     //
  90     // Set NX for stack feature also require PcdDxeIplBuildPageTables be TRUE
  91     // for the DxeIpl and the DxeCore are both X64.
  92     //
  93     ASSERT (PcdGetBool (PcdSetNxForStack) == FALSE);
  94   }
  95
  96   //
  97   // End of PEI phase signal
  98   //
  99   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
 100   ASSERT_EFI_ERROR (Status);
 101
 102   if (FeaturePcdGet (PcdDxeIplBuildPageTables)) {
 103     AsmWriteCr3 (PageTables);
 104   }
 105
 106   //
 107   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
 108   //
 109   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
 110
 111   //
 112   // Transfer the control to the entry point of DxeCore.
 113   //
 114   SwitchStack (
 115     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
 116     HobList.Raw,
 117     NULL,
 118     TopOfStack
 119     );
 120 }