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34 lines
888 B
NASM
34 lines
888 B
NASM
;------------------------------------------------------------------------------
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;
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; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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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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