MdeModulePkg/Core/DxeIplPeim/X64/DxeLoadFunc.c

   1 /** @file
   2   x64-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
  18
  19 /**
  20    Transfers control to DxeCore.
  21
  22    This function performs a CPU architecture specific operations to execute
  23    the entry point of DxeCore with the parameters of HobList.
  24    It also intalls EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  25
  26    @param DxeCoreEntryPoint         The entrypoint of DxeCore.
  27    @param HobList                   The start of HobList passed to DxeCore.
  28
  29 **/
  30 VOID
  31 HandOffToDxeCore (
  32   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  33   IN EFI_PEI_HOB_POINTERS   HobList
  34   )
  35 {
  36   VOID                *BaseOfStack;
  37   VOID                *TopOfStack;
  38   EFI_STATUS          Status;
  39
  40   //
  41   // Allocate 128KB for the Stack
  42   //
  43   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  44   ASSERT (BaseOfStack != NULL);
  45
  46   //
  47   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  48   // for safety.
  49   //
  50   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  51   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  52
  53   //
  54   // End of PEI phase singal
  55   //
  56   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  57   ASSERT_EFI_ERROR (Status);
  58
  59   //
  60   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  61   //
  62   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
  63
  64   //
  65   // Transfer the control to the entry point of DxeCore.
  66   //
  67   SwitchStack (
  68     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  69     HobList.Raw,
  70     NULL,
  71     TopOfStack
  72     );
  73 }