MdeModulePkg/Core/DxeIplPeim/Arm/DxeLoadFunc.c

   1 /** @file
   2   ARM specifc functionality for DxeLoad.
   3
   4 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   5 Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
   6
   7 SPDX-License-Identifier: BSD-2-Clause-Patent
   8
   9 **/
  10
  11 #include "DxeIpl.h"
  12
  13 #include <Library/ArmMmuLib.h>
  14
  15 /**
  16    Transfers control to DxeCore.
  17
  18    This function performs a CPU architecture specific operations to execute
  19    the entry point of DxeCore with the parameters of HobList.
  20    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  21
  22    @param DxeCoreEntryPoint         The entry point of DxeCore.
  23    @param HobList                   The start of HobList passed to DxeCore.
  24
  25 **/
  26 VOID
  27 HandOffToDxeCore (
  28   IN EFI_PHYSICAL_ADDRESS  DxeCoreEntryPoint,
  29   IN EFI_PEI_HOB_POINTERS  HobList
  30   )
  31 {
  32   VOID        *BaseOfStack;
  33   VOID        *TopOfStack;
  34   EFI_STATUS  Status;
  35
  36   //
  37   // Allocate 128KB for the Stack
  38   //
  39   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  40   ASSERT (BaseOfStack != NULL);
  41
  42   if (PcdGetBool (PcdSetNxForStack)) {
  43     Status = ArmSetMemoryRegionNoExec ((UINTN)BaseOfStack, STACK_SIZE);
  44     ASSERT_EFI_ERROR (Status);
  45   }
  46
  47   //
  48   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  49   // for safety.
  50   //
  51   TopOfStack = (VOID *)((UINTN)BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  52   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  53
  54   //
  55   // End of PEI phase singal
  56   //
  57   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  58   ASSERT_EFI_ERROR (Status);
  59
  60   //
  61   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  62   //
  63   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN)BaseOfStack, STACK_SIZE);
  64
  65   SwitchStack (
  66     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  67     HobList.Raw,
  68     NULL,
  69     TopOfStack
  70     );
  71 }