| David Howells | 00460f4 | 2009-07-02 00:46:16 +0100 | [diff] [blame] | 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 | |
| 21 | ############################################################################### |
| 22 | # |
| David Howells | 00460f4 | 2009-07-02 00:46:16 +0100 | [diff] [blame] | 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 | |