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40 lines
1.2 KiB
40 lines
1.2 KiB
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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; This program and the accompanying materials
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; are licensed and made available under the terms and conditions of the BSD License
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; which accompanies this distribution. The full text of the license may be found at
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; http://opensource.org/licenses/bsd-license.php.
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;
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; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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;
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; Module Name:
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;
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; InterlockedDecrement.Asm
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;
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; Abstract:
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;
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; InterlockedDecrement function
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;
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; Notes:
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;
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;------------------------------------------------------------------------------
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SECTION .text
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;------------------------------------------------------------------------------
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; UINT32
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; EFIAPI
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; InternalSyncDecrement (
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; IN volatile UINT32 *Value
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; );
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;------------------------------------------------------------------------------
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global ASM_PFX(InternalSyncDecrement)
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ASM_PFX(InternalSyncDecrement):
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mov ecx, [esp + 4]
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mov eax, 0FFFFFFFFh
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lock xadd dword [ecx], eax
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dec eax
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ret
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