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# 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 310: 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 530: 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 69