Commit | Line | Data |
---|---|---|
00460f41 DH |
1 | /* kernel atomic64 operations |
2 | * | |
3 | * For an explanation of how atomic ops work in this arch, see: | |
4 | * Documentation/frv/atomic-ops.txt | |
5 | * | |
6 | * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved. | |
7 | * Written by David Howells (dhowells@redhat.com) | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
15 | #include <asm/spr-regs.h> | |
16 | ||
17 | .text | |
18 | .balign 4 | |
19 | ||
20 | ||
00460f41 DH |
21 | ############################################################################### |
22 | # | |
23 | # uint64_t __xchg_64(uint64_t i, uint64_t *v) | |
24 | # | |
25 | ############################################################################### | |
26 | .globl __xchg_64 | |
27 | .type __xchg_64,@function | |
28 | __xchg_64: | |
29 | or.p gr8,gr8,gr4 | |
30 | or gr9,gr9,gr5 | |
31 | 0: | |
32 | orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */ | |
33 | ckeq icc3,cc7 | |
34 | ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */ | |
35 | orcr cc7,cc7,cc3 /* set CC3 to true */ | |
36 | cstd.p gr4,@(gr10,gr0) ,cc3,#1 | |
37 | corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */ | |
38 | beq icc3,#0,0b | |
39 | bralr | |
40 | ||
41 | .size __xchg_64, .-__xchg_64 | |
42 | ||
43 | ############################################################################### | |
44 | # | |
45 | # uint64_t __cmpxchg_64(uint64_t test, uint64_t new, uint64_t *v) | |
46 | # | |
47 | ############################################################################### | |
48 | .globl __cmpxchg_64 | |
49 | .type __cmpxchg_64,@function | |
50 | __cmpxchg_64: | |
51 | or.p gr8,gr8,gr4 | |
52 | or gr9,gr9,gr5 | |
53 | 0: | |
54 | orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */ | |
55 | ckeq icc3,cc7 | |
56 | ldd.p @(gr12,gr0),gr8 /* LDD.P/ORCR must be atomic */ | |
57 | orcr cc7,cc7,cc3 | |
58 | subcc gr8,gr4,gr0,icc0 | |
59 | subcc.p gr9,gr5,gr0,icc1 | |
60 | bnelr icc0,#0 | |
61 | bnelr icc1,#0 | |
62 | cstd.p gr10,@(gr12,gr0) ,cc3,#1 | |
63 | corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */ | |
64 | beq icc3,#0,0b | |
65 | bralr | |
66 | ||
67 | .size __cmpxchg_64, .-__cmpxchg_64 | |
68 |