diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-07-16 10:21:51 -0400 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-07-16 10:21:51 -0400 |
commit | 54ea06f6afe85aaf419e51343d4e4b5599197113 (patch) | |
tree | e486f20da3931e62f07014c4aaf8d7042d656151 /arch/arm/lib/bitops.h | |
parent | 9fb1759a3102c26cd8f64254a7c3e532782c2bb8 (diff) |
[PATCH] ARM: Convert bitops to use ARMv6 ldrex/strex instructions
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib/bitops.h')
-rw-r--r-- | arch/arm/lib/bitops.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h index 4a83ab6cd56..6976e60e47c 100644 --- a/arch/arm/lib/bitops.h +++ b/arch/arm/lib/bitops.h | |||
@@ -1,3 +1,33 @@ | |||
1 | #if __LINUX_ARM_ARCH__ >= 6 | ||
2 | .macro bitop, instr | ||
3 | mov r2, #1 | ||
4 | and r3, r0, #7 @ Get bit offset | ||
5 | add r1, r1, r0, lsr #3 @ Get byte offset | ||
6 | mov r3, r2, lsl r3 | ||
7 | 1: ldrexb r2, [r1] | ||
8 | \instr r2, r2, r3 | ||
9 | strexb r0, r2, [r1] | ||
10 | cmpne r0, #0 | ||
11 | bne 1b | ||
12 | mov pc, lr | ||
13 | .endm | ||
14 | |||
15 | .macro testop, instr, store | ||
16 | and r3, r0, #7 @ Get bit offset | ||
17 | mov r2, #1 | ||
18 | add r1, r1, r0, lsr #3 @ Get byte offset | ||
19 | mov r3, r2, lsl r3 @ create mask | ||
20 | 1: ldrexb r2, [r1] | ||
21 | ands r0, r2, r3 @ save old value of bit | ||
22 | \instr ip, r2, r3 @ toggle bit | ||
23 | strexb r2, ip, [r1] | ||
24 | cmp r2, #0 | ||
25 | bne 1b | ||
26 | cmp r0, #0 | ||
27 | movne r0, #1 | ||
28 | 2: mov pc, lr | ||
29 | .endm | ||
30 | #else | ||
1 | .macro bitop, instr | 31 | .macro bitop, instr |
2 | and r2, r0, #7 | 32 | and r2, r0, #7 |
3 | mov r3, #1 | 33 | mov r3, #1 |
@@ -31,3 +61,4 @@ | |||
31 | moveq r0, #0 | 61 | moveq r0, #0 |
32 | mov pc, lr | 62 | mov pc, lr |
33 | .endm | 63 | .endm |
64 | #endif | ||