diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-07-16 15:21:51 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2005-07-16 15:21:51 +0100 |
| 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 @@ +#if __LINUX_ARM_ARCH__ >= 6 + .macro bitop, instr + mov r2, #1 + and r3, r0, #7 @ Get bit offset + add r1, r1, r0, lsr #3 @ Get byte offset + mov r3, r2, lsl r3 +1: ldrexb r2, [r1] + \instr r2, r2, r3 + strexb r0, r2, [r1] + cmpne r0, #0 + bne 1b + mov pc, lr + .endm + + .macro testop, instr, store + and r3, r0, #7 @ Get bit offset + mov r2, #1 + add r1, r1, r0, lsr #3 @ Get byte offset + mov r3, r2, lsl r3 @ create mask +1: ldrexb r2, [r1] + ands r0, r2, r3 @ save old value of bit + \instr ip, r2, r3 @ toggle bit + strexb r2, ip, [r1] + cmp r2, #0 + bne 1b + cmp r0, #0 + movne r0, #1 +2: mov pc, lr + .endm +#else .macro bitop, instr and r2, r0, #7 mov r3, #1 @@ -31,3 +61,4 @@ moveq r0, #0 mov pc, lr .endm +#endif |