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 This program and the accompanying materials
   8 are licensed and made available under the terms and conditions of the BSD License
   9 which accompanies this distribution.  The full text of the license may be found at
  10 http://opensource.org/licenses/bsd-license.php
  11
  12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  14
  15 **/
  16
  17 #include "DxeIpl.h"
  18
  19 #include <Library/ArmMmuLib.h>
  20
  21 /**
  22    Transfers control to DxeCore.
  23
  24    This function performs a CPU architecture specific operations to execute
  25    the entry point of DxeCore with the parameters of HobList.
  26    It also installs EFI_END_OF_PEI_PPI to signal the end of PEI phase.
  27
  28    @param DxeCoreEntryPoint         The entry point of DxeCore.
  29    @param HobList                   The start of HobList passed to DxeCore.
  30
  31 **/
  32 VOID
  33 HandOffToDxeCore (
  34   IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,
  35   IN EFI_PEI_HOB_POINTERS   HobList
  36   )
  37 {
  38   VOID                *BaseOfStack;
  39   VOID                *TopOfStack;
  40   EFI_STATUS          Status;
  41
  42   //
  43   // Allocate 128KB for the Stack
  44   //
  45   BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));
  46   ASSERT (BaseOfStack != NULL);
  47
  48   if (PcdGetBool (PcdSetNxForStack)) {
  49     Status = ArmSetMemoryRegionNoExec ((UINTN)BaseOfStack, STACK_SIZE);
  50     ASSERT_EFI_ERROR (Status);
  51   }
  52
  53   //
  54   // Compute the top of the stack we were allocated. Pre-allocate a UINTN
  55   // for safety.
  56   //
  57   TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);
  58   TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);
  59
  60   //
  61   // End of PEI phase singal
  62   //
  63   Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);
  64   ASSERT_EFI_ERROR (Status);
  65
  66   //
  67   // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.
  68   //
  69   UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);
  70
  71   SwitchStack (
  72     (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,
  73     HobList.Raw,
  74     NULL,
  75     TopOfStack
  76     );
  77 }