Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
[PATCH] ARM: Add missing new file for bitops patch
Signed-off-by: Russell King <rmk@arm.linux.org.uk>
+33
arch/arm/lib/bitops.h
+33
arch/arm/lib/bitops.h
···
···
1
+
.macro bitop, instr
2
+
and r2, r0, #7
3
+
mov r3, #1
4
+
mov r3, r3, lsl r2
5
+
save_and_disable_irqs ip, r2
6
+
ldrb r2, [r1, r0, lsr #3]
7
+
\instr r2, r2, r3
8
+
strb r2, [r1, r0, lsr #3]
9
+
restore_irqs ip
10
+
mov pc, lr
11
+
.endm
12
+
13
+
/**
14
+
* testop - implement a test_and_xxx_bit operation.
15
+
* @instr: operational instruction
16
+
* @store: store instruction
17
+
*
18
+
* Note: we can trivially conditionalise the store instruction
19
+
* to avoid dirting the data cache.
20
+
*/
21
+
.macro testop, instr, store
22
+
add r1, r1, r0, lsr #3
23
+
and r3, r0, #7
24
+
mov r0, #1
25
+
save_and_disable_irqs ip, r2
26
+
ldrb r2, [r1]
27
+
tst r2, r0, lsl r3
28
+
\instr r2, r2, r0, lsl r3
29
+
\store r2, [r1]
30
+
restore_irqs ip
31
+
moveq r0, #0
32
+
mov pc, lr
33
+
.endm