MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

   1 /*++
   2
   3 Copyright (c) 2006, Intel Corporation
   4 All rights reserved. This program and the accompanying materials
   5 are licensed and made available under the terms and conditions of the BSD License
   6 which accompanies this distribution.  The full text of the license may be found at
   7 http://opensource.org/licenses/bsd-license.php
   8
   9 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 Module Name:
  13
  14   DxeLoadFunc.c
  15
  16 Abstract:
  17
  18   Ia32-specifc functionality for DxeLoad.
  19
  20 --*/
  21
  22 #include "DxeIpl.h"
  23
  24 VOID
  25 HandOffToDxeCore (
  26   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  27   IN EFI_PEI_HOB_POINTERS   HobList,
  28   IN EFI_PEI_PPI_DESCRIPTOR *EndOfPeiSignal
  29   )
  30 {
  31   VOID                *BaseOfStack;
  32   VOID                *TopOfStack;
  33   EFI_STATUS          Status;
  34
  35   //
  36   // Allocate 128KB for the Stack
  37   //
  38   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  39   ASSERT (BaseOfStack != NULL);
  40
  41   //
  42   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  43   // for safety.
  44   //
  45   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  46   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  47
  48   //
  49   // End of PEI phase singal
  50   //
  51   Status = PeiServicesInstallPpi (EndOfPeiSignal);
  52   ASSERT_EFI_ERROR (Status);
  53
  54   SwitchStack (
  55     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  56     HobList.Raw,
  57     NULL,
  58     TopOfStack
  59     );
  60 }