MdePkg/BaseSynchronizationLib: Add volatile Interlocked*() APIs

[mirror_edk2.git] / MdePkg / Library / BaseSynchronizationLib / Ia32 / InterlockedCompareExchange32.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>\r
; 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
; Module Name:\r
;\r
;   InterlockedCompareExchange32.Asm\r
;\r
; Abstract:\r
;\r
;   InterlockedCompareExchange32 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .486\r
    .model  flat,C\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; UINT32\r
; EFIAPI\r
; InternalSyncCompareExchange32 (\r
;   IN      volatile UINT32           *Value,\r
;   IN      UINT32                    CompareValue,\r
;   IN      UINT32                    ExchangeValue\r
;   );\r
;------------------------------------------------------------------------------\r
InternalSyncCompareExchange32   PROC\r
    mov     ecx, [esp + 4]\r
    mov     eax, [esp + 8]\r
    mov     edx, [esp + 12]\r
    lock    cmpxchg [ecx], edx\r
    ret\r
InternalSyncCompareExchange32   ENDP\r
\r
    END\r