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1da177e4 LT |
1 | /* atomic-ops.S: kernel atomic operations |
2 | * | |
3 | * For an explanation of how atomic ops work in this arch, see: | |
0868ff7a | 4 | * Documentation/frv/atomic-ops.txt |
1da177e4 LT |
5 | * |
6 | * Copyright (C) 2004 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 | ||
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20 | ############################################################################### |
21 | # | |
22 | # uint32_t __xchg_32(uint32_t i, uint32_t *v) | |
23 | # | |
24 | ############################################################################### | |
25 | .globl __xchg_32 | |
26 | .type __xchg_32,@function | |
27 | __xchg_32: | |
28 | or.p gr8,gr8,gr10 | |
29 | 0: | |
30 | orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */ | |
31 | ckeq icc3,cc7 | |
32 | ld.p @(gr9,gr0),gr8 /* LD.P/ORCR must be atomic */ | |
33 | orcr cc7,cc7,cc3 /* set CC3 to true */ | |
34 | cst.p gr10,@(gr9,gr0) ,cc3,#1 | |
35 | corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */ | |
36 | beq icc3,#0,0b | |
37 | bralr | |
38 | ||
39 | .size __xchg_32, .-__xchg_32 | |
40 | ||
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41 | ############################################################################### |
42 | # | |
43 | # uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new) | |
44 | # | |
45 | ############################################################################### | |
46 | .globl __cmpxchg_32 | |
47 | .type __cmpxchg_32,@function | |
48 | __cmpxchg_32: | |
49 | or.p gr8,gr8,gr11 | |
50 | 0: | |
51 | orcc gr0,gr0,gr0,icc3 | |
52 | ckeq icc3,cc7 | |
53 | ld.p @(gr11,gr0),gr8 | |
54 | orcr cc7,cc7,cc3 | |
55 | subcc gr8,gr9,gr7,icc0 | |
00460f41 | 56 | bnelr icc0,#0 |
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57 | cst.p gr10,@(gr11,gr0) ,cc3,#1 |
58 | corcc gr29,gr29,gr0 ,cc3,#1 | |
59 | beq icc3,#0,0b | |
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60 | bralr |
61 | ||
62 | .size __cmpxchg_32, .-__cmpxchg_32 |