Create X64 mode page tables in memory even when PEI is already X64

[mirror_edk2.git] / MdeModulePkg / Core / DxeIplPeim / X64 / DxeLoadFunc.c

/** @file\r
  x64-specifc functionality for DxeLoad.\r
\r
Copyright (c) 2006 - 2008, Intel Corporation. <BR>\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include "DxeIpl.h"\r
#include "X64/VirtualMemory.h"\r
\r
\r
\r
/**\r
   Transfers control to DxeCore.\r
\r
   This function performs a CPU architecture specific operations to execute\r
   the entry point of DxeCore with the parameters of HobList.\r
   It also intalls EFI_END_OF_PEI_PPI to signal the end of PEI phase.\r
\r
   @param DxeCoreEntryPoint         The entrypoint of DxeCore.\r
   @param HobList                   The start of HobList passed to DxeCore.\r
\r
**/\r
VOID\r
HandOffToDxeCore (\r
  IN EFI_PHYSICAL_ADDRESS   DxeCoreEntryPoint,\r
  IN EFI_PEI_HOB_POINTERS   HobList\r
  )\r
{\r
  VOID                *BaseOfStack;\r
  VOID                *TopOfStack;\r
  EFI_STATUS          Status;\r
  UINTN               PageTables;\r
\r
  //\r
  // Allocate 128KB for the Stack\r
  //\r
  BaseOfStack = AllocatePages (EFI_SIZE_TO_PAGES (STACK_SIZE));\r
  ASSERT (BaseOfStack != NULL);\r
\r
  //\r
  // Compute the top of the stack we were allocated. Pre-allocate a UINTN\r
  // for safety.\r
  //\r
  TopOfStack = (VOID *) ((UINTN) BaseOfStack + EFI_SIZE_TO_PAGES (STACK_SIZE) * EFI_PAGE_SIZE - CPU_STACK_ALIGNMENT);\r
  TopOfStack = ALIGN_POINTER (TopOfStack, CPU_STACK_ALIGNMENT);\r
\r
  //\r
  // Create page table and save PageMapLevel4 to CR3\r
  //\r
  PageTables = CreateIdentityMappingPageTables ();\r
\r
  //\r
  // End of PEI phase singal\r
  //\r
  Status = PeiServicesInstallPpi (&gEndOfPeiSignalPpi);\r
  ASSERT_EFI_ERROR (Status);\r
\r
  AsmWriteCr3 (PageTables);\r
\r
  //\r
  // Update the contents of BSP stack HOB to reflect the real stack info passed to DxeCore.\r
  //    \r
  UpdateStackHob ((EFI_PHYSICAL_ADDRESS)(UINTN) BaseOfStack, STACK_SIZE);\r
\r
  //\r
  // Transfer the control to the entry point of DxeCore.\r
  //\r
  SwitchStack (\r
    (SWITCH_STACK_ENTRY_POINT)(UINTN)DxeCoreEntryPoint,\r
    HobList.Raw,\r
    NULL,\r
    TopOfStack\r
    );\r
}\r