MdePkg/Library/BaseSynchronizationLib/Ia32/InterlockedDecrement.nasm

   1 ;------------------------------------------------------------------------------
   2 ;
   3 ; Copyright (c) 2006, 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 ; Module Name:
  13 ;
  14 ;   InterlockedDecrement.Asm
  15 ;
  16 ; Abstract:
  17 ;
  18 ;   InterlockedDecrement function
  19 ;
  20 ; Notes:
  21 ;
  22 ;------------------------------------------------------------------------------
  23
  24     SECTION .text
  25
  26 ;------------------------------------------------------------------------------
  27 ; UINT32
  28 ; EFIAPI
  29 ; InternalSyncDecrement (
  30 ;   IN      UINT32                    *Value
  31 ;   );
  32 ;------------------------------------------------------------------------------
  33 global ASM_PFX(InternalSyncDecrement)
  34 ASM_PFX(InternalSyncDecrement):
  35     mov     eax, [esp + 4]
  36     lock    dec     dword [eax]
  37     mov     eax, [eax]
  38     ret
  39