MdeModulePkg/Core/DxeIplPeim/Ebc/DxeLoadFunc.c

   1 /** @file
   2   EBC-specific functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5 SPDX-License-Identifier: BSD-2-Clause-Patent
   6
   7 **/
   8
   9 #include "DxeIpl.h"
  10
  11
  12
  13 /**
  14    Transfers control to DxeCore.
  15
  16    This function performs a CPU architecture specific operations to execute
  17    the entry point of DxeCore with the parameters of HobList.
  18    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  19
  20    @param DxeCoreEntryPoint         The entry point of DxeCore.
  21    @param HobList                   The start of HobList passed to DxeCore.
  22
  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   EFI_STATUS          Status;
  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   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  42   // for safety.
  43   //
  44   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  45   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  46
  47   //
  48   // End of PEI phase signal
  49   //
  50   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  51   ASSERT_EFI_ERROR (Status);
  52
  53   //
  54   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  55   //
  56   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
  57
  58   //
  59   // Transfer the control to the entry point of DxeCore.
  60   //
  61   SwitchStack (
  62     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  63     HobList.Raw,
  64     NULL,
  65     TopOfStack
  66     );
  67 }