| /* Copyright 2013-2014 IBM Corp. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or |
| * implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <asm-utils.h> |
| #include <asm-offsets.h> |
| #include <processor.h> |
| |
| .section ".text","ax" |
| .balign 0x10 |
| |
| /* bool try_lock(struct lock *lock) */ |
| .global __try_lock |
| __try_lock: |
| ld %r0,0(%r3) |
| andi. %r10,%r0,1 |
| bne 2f |
| lwz %r9,CPUTHREAD_PIR(%r13) |
| 1: ldarx %r0,0,%r3 |
| andi. %r10,%r0,1 |
| bne- 2f |
| ori %r0,%r0,1 |
| rldimi %r0,%r9,32,0 |
| stdcx. %r0,0,%r3 |
| bne 1b |
| sync |
| li %r3,-1 |
| blr |
| 2: li %r3,0 |
| blr |
| |
