MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

   1 /** @file
   2   Ia32-specifc functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2008, Intel Corporation. <BR>
   5 All rights reserved. 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
  17 VOID
  18 HandOffToDxeCore (
  19   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  20   IN EFI_PEI_HOB_POINTERS   HobList,
  21   IN EFI_PEI_PPI_DESCRIPTOR *EndOfPeiSignal
  22   )
  23 {
  24   VOID                *BaseOfStack;
  25   VOID                *TopOfStack;
  26   EFI_STATUS          Status;
  27
  28   //
  29   // Allocate 128KB for the Stack
  30   //
  31   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  32   ASSERT (BaseOfStack != NULL);
  33
  34   //
  35   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  36   // for safety.
  37   //
  38   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  39   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  40
  41   //
  42   // End of PEI phase singal
  43   //
  44   Status = PeiServicesInstallPpi (EndOfPeiSignal);
  45   ASSERT_EFI_ERROR (Status);
  46
  47   //
  48   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  49   //
  50   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
  51
  52   SwitchStack (
  53     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  54     HobList.Raw,
  55     NULL,
  56     TopOfStack
  57     );
  58 }