| /* kernel atomic64 operations |
| * |
| * For an explanation of how atomic ops work in this arch, see: |
| * Documentation/frv/atomic-ops.txt |
| * |
| * Copyright (C) 2009 Red Hat, Inc. All Rights Reserved. |
| * Written by David Howells (dhowells@redhat.com) |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| */ |
| |
| #include <asm/spr-regs.h> |
| |
| .text |
| .balign 4 |
| |
| |
| ############################################################################### |
| # |
| # uint64_t __xchg_64(uint64_t i, uint64_t *v) |
| # |
| ############################################################################### |
| .globl __xchg_64 |
| .type __xchg_64,@function |
| __xchg_64: |
| or.p gr8,gr8,gr4 |
| or gr9,gr9,gr5 |
| 0: |
| orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */ |
| ckeq icc3,cc7 |
| ldd.p @(gr10,gr0),gr8 /* LDD.P/ORCR must be atomic */ |
| orcr cc7,cc7,cc3 /* set CC3 to true */ |
| cstd.p gr4,@(gr10,gr0) ,cc3,#1 |
| corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */ |
| beq icc3,#0,0b |
| bralr |
| |
| .size __xchg_64, .-__xchg_64 |
| |
| ############################################################################### |
| # |
| # uint64_t __cmpxchg_64(uint64_t test, uint64_t new, uint64_t *v) |
| # |
| ############################################################################### |
| .globl __cmpxchg_64 |
| .type __cmpxchg_64,@function |
| __cmpxchg_64: |
| or.p gr8,gr8,gr4 |
| or gr9,gr9,gr5 |
| 0: |
| orcc gr0,gr0,gr0,icc3 /* set ICC3.Z */ |
| ckeq icc3,cc7 |
| ldd.p @(gr12,gr0),gr8 /* LDD.P/ORCR must be atomic */ |
| orcr cc7,cc7,cc3 |
| subcc gr8,gr4,gr0,icc0 |
| subcc.p gr9,gr5,gr0,icc1 |
| bnelr icc0,#0 |
| bnelr icc1,#0 |
| cstd.p gr10,@(gr12,gr0) ,cc3,#1 |
| corcc gr29,gr29,gr0 ,cc3,#1 /* clear ICC3.Z if store happens */ |
| beq icc3,#0,0b |
| bralr |
| |
| .size __cmpxchg_64, .-__cmpxchg_64 |
| |