File: lock.S

package info (click to toggle)
skiboot 5.3.3-1
  • links: PTS
  • area: main
  • in suites: stretch
  • size: 13,280 kB
  • ctags: 13,840
  • sloc: ansic: 77,199; asm: 1,002; sh: 997; cpp: 894; tcl: 408; makefile: 325; python: 166; pascal: 65
file content (43 lines) | stat: -rw-r--r-- 995 bytes parent folder | download
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