diff options
| author | Steve French <sfrench@hera.kernel.org> | 2005-07-19 14:36:00 -0700 |
|---|---|---|
| committer | Steve French <sfrench@hera.kernel.org> | 2005-07-19 14:36:00 -0700 |
| commit | 076fb01e8238b7e5d68ba0d729c0ff7716d1d8ec (patch) | |
| tree | abcaefe016870427ed289748cb0b936575d60593 /arch/arm/lib/bitops.h | |
| parent | 4c48b0d3d1c7ff9f13134b30e41c6e81a92027bf (diff) | |
| parent | f60f700876cd51de9de69f3a3c865d95e287a24d (diff) | |
Merge with rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
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 |