1*418b791dSBob Badour /*
2*418b791dSBob Badour * Copyright (c) 2019, The Linux Foundation. All rights reserved.
3*418b791dSBob Badour *
4*418b791dSBob Badour * Redistribution and use in source and binary forms, with or without
5*418b791dSBob Badour * modification, are permitted provided that the following conditions are
6*418b791dSBob Badour * met:
7*418b791dSBob Badour * * Redistributions of source code must retain the above copyright
8*418b791dSBob Badour * notice, this list of conditions and the following disclaimer.
9*418b791dSBob Badour * * Redistributions in binary form must reproduce the above
10*418b791dSBob Badour * copyright notice, this list of conditions and the following
11*418b791dSBob Badour * disclaimer in the documentation and/or other materials provided
12*418b791dSBob Badour * with the distribution.
13*418b791dSBob Badour * * Neither the name of The Linux Foundation nor the names of its
14*418b791dSBob Badour * contributors may be used to endorse or promote products derived
15*418b791dSBob Badour * from this software without specific prior written permission.
16*418b791dSBob Badour *
17*418b791dSBob Badour * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
18*418b791dSBob Badour * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19*418b791dSBob Badour * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
20*418b791dSBob Badour * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
21*418b791dSBob Badour * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22*418b791dSBob Badour * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23*418b791dSBob Badour * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
24*418b791dSBob Badour * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
25*418b791dSBob Badour * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
26*418b791dSBob Badour * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
27*418b791dSBob Badour * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28*418b791dSBob Badour */
29*418b791dSBob Badour #include "AEEatomic.h"
30*418b791dSBob Badour
atomic_Add(uint32 * volatile puDest,int nAdd)31*418b791dSBob Badour uint32 atomic_Add(uint32 * volatile puDest, int nAdd) {
32*418b791dSBob Badour uint32 previous;
33*418b791dSBob Badour uint32 current;
34*418b791dSBob Badour do {
35*418b791dSBob Badour current = *puDest;
36*418b791dSBob Badour previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
37*418b791dSBob Badour } while(previous != current);
38*418b791dSBob Badour return (current + nAdd);
39*418b791dSBob Badour }
40*418b791dSBob Badour
atomic_Exchange(uint32 * volatile puDest,uint32 uVal)41*418b791dSBob Badour uint32 atomic_Exchange(uint32* volatile puDest, uint32 uVal) {
42*418b791dSBob Badour uint32 previous;
43*418b791dSBob Badour uint32 current;
44*418b791dSBob Badour do {
45*418b791dSBob Badour current = *puDest;
46*418b791dSBob Badour previous = atomic_CompareAndExchange(puDest, uVal, current);
47*418b791dSBob Badour } while(previous != current);
48*418b791dSBob Badour return previous;
49*418b791dSBob Badour }
50*418b791dSBob Badour
atomic_CompareOrAdd(uint32 * volatile puDest,uint32 uCompare,int nAdd)51*418b791dSBob Badour uint32 atomic_CompareOrAdd(uint32* volatile puDest, uint32 uCompare, int nAdd) {
52*418b791dSBob Badour uint32 previous;
53*418b791dSBob Badour uint32 current;
54*418b791dSBob Badour uint32 result;
55*418b791dSBob Badour do {
56*418b791dSBob Badour current = *puDest;
57*418b791dSBob Badour previous = current;
58*418b791dSBob Badour result = current;
59*418b791dSBob Badour if(current != uCompare) {
60*418b791dSBob Badour previous = atomic_CompareAndExchange(puDest, current + nAdd, current);
61*418b791dSBob Badour if(previous == current) {
62*418b791dSBob Badour result = current + nAdd;
63*418b791dSBob Badour }
64*418b791dSBob Badour }
65*418b791dSBob Badour } while(previous != current);
66*418b791dSBob Badour return result;
67*418b791dSBob Badour }
68*418b791dSBob Badour
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