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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* atomic-ops.S: kernel atomic operations
2 *
3 * For an explanation of how atomic ops work in this arch, see:
Adrian Bunk0868ff72008-02-03 15:54:28 +02004 * Documentation/frv/atomic-ops.txt
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
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
20###############################################################################
21#
Linus Torvalds1da177e2005-04-16 15:20:36 -070022# 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
290:
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
41###############################################################################
42#
Linus Torvalds1da177e2005-04-16 15:20:36 -070043# 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
500:
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
David Howells00460f42009-07-02 00:46:16 +010056 bnelr icc0,#0
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 cst.p gr10,@(gr11,gr0) ,cc3,#1
58 corcc gr29,gr29,gr0 ,cc3,#1
59 beq icc3,#0,0b
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 bralr
61
62 .size __cmpxchg_32, .-__cmpxchg_32