IntelFsp2Pkg/Include/Library/FspSwitchStackLib.h

   1 /** @file
   2
   3   Copyright (c) 2014 - 2020, Intel Corporation. All rights reserved.<BR>
   4   SPDX-License-Identifier: BSD-2-Clause-Patent
   5
   6 **/
   7
   8 #ifndef _FSP_SWITCH_STACK_LIB_H_
   9 #define _FSP_SWITCH_STACK_LIB_H_
  10
  11 /**
  12
  13   This function will switch the current stack to the previous saved stack.
  14   Before calling the previous stack has to be set in  FSP_GLOBAL_DATA.CoreStack.
  15                     EIP
  16                     FLAGS  16 bit  FLAGS  16 bit
  17                     EDI
  18                     ESI
  19                     EBP
  20                     ESP
  21                     EBX
  22                     EDX
  23                     ECX
  24                     EAX
  25                     DWORD     IDT base1
  26   StackPointer:     DWORD     IDT base2
  27
  28   @return ReturnKey          After switching to the saved stack,
  29                              this value will be saved in eax before returning.
  30
  31
  32 **/
  33 EFI_STATUS
  34 EFIAPI
  35 Pei2LoaderSwitchStack (
  36   VOID
  37   );
  38
  39 /**
  40
  41   This function is equivalent to Pei2LoaderSwitchStack () but just indicates
  42   the stack after switched is FSP stack.
  43
  44   @return ReturnKey          After switching to the saved stack,
  45                              this value will be saved in eax before returning.
  46
  47
  48 **/
  49 EFI_STATUS
  50 EFIAPI
  51 Loader2PeiSwitchStack (
  52   VOID
  53   );
  54
  55 #endif