IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h

   1 /** @file
   2
   3   Copyright (c) 2014, Intel Corporation. All rights reserved.<BR>
   4   This program and the accompanying materials
   5   are licensed and made available under the terms and conditions of the BSD License
   6   which accompanies this distribution.  The full text of the license may be found at
   7   http://opensource.org/licenses/bsd-license.php.
   8
   9   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  10   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  11
  12 **/
  13
  14 #ifndef _FSP_SWITCH_STACK_LIB_H_
  15 #define _FSP_SWITCH_STACK_LIB_H_
  16
  17 /**
  18
  19   This funciton will switch the current stack to the previous saved stack.
  20   Before calling the previous stack has to be set in  FSP_GLOBAL_DATA.CoreStack.
  21                     EIP
  22                     FLAGS  16 bit  FLAGS  16 bit
  23                     EDI
  24                     ESI
  25                     EBP
  26                     ESP
  27                     EBX
  28                     EDX
  29                     ECX
  30                     EAX
  31                     DWORD     IDT base1
  32   StackPointer:     DWORD     IDT base2
  33
  34   @return ReturnKey          After switching to the saved stack,
  35                              this value will be saved in eax before returning.
  36
  37
  38 **/
  39 UINT32
  40 EFIAPI
  41 Pei2LoaderSwitchStack (
  42   VOID
  43   );
  44
  45 #endif