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
44
45
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2023 Sean Anderson <sean.anderson@seco.com>
*
* ARM bitops to call when using THUMB1, which doesn't have these instructions.
*/
#include <linux/linkage.h>
#include <asm/assembler.h>
.pushsection .text.__fls
ENTRY(__fls)
clz r0, r0
rsb r0, r0, #31
ret lr
ENDPROC(__fls)
.popsection
.pushsection .text.__ffs
ENTRY(__ffs)
rsb r3, r0, #0
and r0, r0, r3
clz r0, r0
rsb r0, r0, #31
ret lr
ENDPROC(__ffs)
.popsection
.pushsection .text.fls
ENTRY(fls)
cmp r0, #0
clzne r0, r0
rsbne r0, r0, #32
ret lr
ENDPROC(fls)
.popsection
.pushsection .text.ffs
ENTRY(ffs)
rsb r3, r0, #0
and r0, r0, r3
clz r0, r0
rsb r0, r0, #32
ret lr
ENDPROC(ffs)
.popsection
|
