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Commit | Line | Data |
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8605247f JJ |
1 | ;------------------------------------------------------------------------------\r |
2 | ;\r | |
17634d02 | 3 | ; Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r |
9344f092 | 4 | ; SPDX-License-Identifier: BSD-2-Clause-Patent\r |
8605247f JJ |
5 | ;\r |
6 | ; Module Name:\r | |
7 | ;\r | |
8 | ; InterlockedDecrement.Asm\r | |
9 | ;\r | |
10 | ; Abstract:\r | |
11 | ;\r | |
12 | ; InterlockedDecrement function\r | |
13 | ;\r | |
14 | ; Notes:\r | |
15 | ;\r | |
16 | ;------------------------------------------------------------------------------\r | |
17 | \r | |
18 | SECTION .text\r | |
19 | \r | |
20 | ;------------------------------------------------------------------------------\r | |
21 | ; UINT32\r | |
22 | ; EFIAPI\r | |
23 | ; InternalSyncDecrement (\r | |
4cee954e | 24 | ; IN volatile UINT32 *Value\r |
8605247f JJ |
25 | ; );\r |
26 | ;------------------------------------------------------------------------------\r | |
27 | global ASM_PFX(InternalSyncDecrement)\r | |
28 | ASM_PFX(InternalSyncDecrement):\r | |
17634d02 RN |
29 | mov ecx, [esp + 4]\r |
30 | mov eax, 0FFFFFFFFh\r | |
31 | lock xadd dword [ecx], eax\r | |
32 | dec eax\r | |
8605247f | 33 | ret\r |