diff options
| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-04-18 22:50:01 +0100 |
|---|---|---|
| committer | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2005-04-18 22:50:01 +0100 |
| commit | 7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1 (patch) | |
| tree | 4e0333e6a0b6ee4601b0232baa1c5d4832c4aec5 /arch/arm/lib | |
| parent | 9c7d3b3a6b6aaeded9d9e5c5111dbcc65b0b0f91 (diff) | |
| download | linux-3.10-7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1.tar.gz linux-3.10-7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1.tar.bz2 linux-3.10-7a55fd0bb31eb369149b89fdf9e0c7bc73486ee1.zip | |
[PATCH] ARM: Add missing new file for bitops patch
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/lib')
| -rw-r--r-- | arch/arm/lib/bitops.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/arm/lib/bitops.h b/arch/arm/lib/bitops.h new file mode 100644 index 00000000000..4a83ab6cd56 --- /dev/null +++ b/arch/arm/lib/bitops.h @@ -0,0 +1,33 @@ + .macro bitop, instr + and r2, r0, #7 + mov r3, #1 + mov r3, r3, lsl r2 + save_and_disable_irqs ip, r2 + ldrb r2, [r1, r0, lsr #3] + \instr r2, r2, r3 + strb r2, [r1, r0, lsr #3] + restore_irqs ip + mov pc, lr + .endm + +/** + * testop - implement a test_and_xxx_bit operation. + * @instr: operational instruction + * @store: store instruction + * + * Note: we can trivially conditionalise the store instruction + * to avoid dirting the data cache. + */ + .macro testop, instr, store + add r1, r1, r0, lsr #3 + and r3, r0, #7 + mov r0, #1 + save_and_disable_irqs ip, r2 + ldrb r2, [r1] + tst r2, r0, lsl r3 + \instr r2, r2, r0, lsl r3 + \store r2, [r1] + restore_irqs ip + moveq r0, #0 + mov pc, lr + .endm |