EdkModulePkg/Core/DxeIplPeim/Ipf/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   IpfDxeLoad.c
  15
  16 Abstract:
  17
  18   Ipf-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   )
  29 {
  30   VOID                *BaseOfStack;
  31   VOID                *TopOfStack;
  32   VOID                *BspStore;
  33
  34   //
  35   // Allocate 128KB for the Stack
  36   //
  37   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  38   ASSERT (BaseOfStack != NULL);
  39
  40   //
  41   // Allocate 16KB for the BspStore
  42   //
  43   BspStore    = AllocatePages (EFI_SIZE_TO_PAGES (BSP_STORE_SIZE));
  44   ASSERT (BspStore != NULL);
  45   //
  46   // Build BspStoreHob
  47   //
  48   BuildBspStoreHob ((EFI_PHYSICAL_ADDRESS) (UINTN) BspStore, BSP_STORE_SIZE, EfiBootServicesData);
  49
  50   //
  51   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  52   // for safety.
  53   //
  54   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  55   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  56
  57   AsmSwitchStackAndBackingStore (
  58     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  59     HobList.Raw,
  60     NULL,
  61     TopOfStack,
  62     BspStore
  63     );
  64 }