1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
/* 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
|
