MdeModulePkg/Core/DxeIplPeim/Ipf/DxeLoadFunc.c

   1 /** @file
   2   Ipf-specific functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2008, 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
  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 installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  25
  26    @param DxeCoreEntryPoint         The entry point 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   VOID                *BspStore;
  39   EFI_STATUS          Status;
  40
  41   //
  42   // Allocate 128KB for the Stack
  43   //
  44   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  45   ASSERT (BaseOfStack != NULL);
  46
  47   //
  48   // Allocate 16KB for the BspStore
  49   //
  50   BspStore    = AllocatePages (EFI_SIZE_TO_PAGES (BSP_STORE_SIZE));
  51   ASSERT (BspStore != NULL);
  52   //
  53   // Build BspStoreHob
  54   //
  55   BuildBspStoreHob ((EFI_PHYSICAL_ADDRESS) (UINTN) BspStore, BSP_STORE_SIZE, EfiBootServicesData);
  56
  57   //
  58   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  59   // for safety.
  60   //
  61   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  62   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  63
  64   //
  65   // End of PEI phase signal
  66   //
  67   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  68   ASSERT_EFI_ERROR (Status);
  69
  70   //
  71   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  72   //
  73   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
  74
  75   //
  76   // Transfer the control to the entry point of DxeCore.
  77   //
  78   SwitchStack (
  79     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  80     HobList.Raw,
  81     NULL,
  82     TopOfStack,
  83     BspStore
  84     );
  85 }