1#include <asm/assembler.h>
  2#include <asm/unwind.h>
  3
  4#if __LINUX_ARM_ARCH__ >= 6
  5	.macro	bitop, name, instr
  6ENTRY(	\name		)
  7UNWIND(	.fnstart	)
  8	ands	ip, r1, #3
  9	strneb	r1, [ip]		@ assert word-aligned
 10	mov	r2, #1
 11	and	r3, r0, #31		@ Get bit offset
 12	mov	r0, r0, lsr #5
 13	add	r1, r1, r0, lsl #2	@ Get word offset
 14#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
 15	.arch_extension	mp
 16	ALT_SMP(W(pldw)	[r1])
 17	ALT_UP(W(nop))
 18#endif
 19	mov	r3, r2, lsl r3
 201:	ldrex	r2, [r1]
 21	\instr	r2, r2, r3
 22	strex	r0, r2, [r1]
 23	cmp	r0, #0
 24	bne	1b
 25	bx	lr
 26UNWIND(	.fnend		)
 27ENDPROC(\name		)
 28	.endm
 29
 30	.macro	testop, name, instr, store
 31ENTRY(	\name		)
 32UNWIND(	.fnstart	)
 33	ands	ip, r1, #3
 34	strneb	r1, [ip]		@ assert word-aligned
 35	mov	r2, #1
 36	and	r3, r0, #31		@ Get bit offset
 37	mov	r0, r0, lsr #5
 38	add	r1, r1, r0, lsl #2	@ Get word offset
 39	mov	r3, r2, lsl r3		@ create mask
 40	smp_dmb
 41#if __LINUX_ARM_ARCH__ >= 7 && defined(CONFIG_SMP)
 42	.arch_extension	mp
 43	ALT_SMP(W(pldw)	[r1])
 44	ALT_UP(W(nop))
 45#endif
 461:	ldrex	r2, [r1]
 47	ands	r0, r2, r3		@ save old value of bit
 48	\instr	r2, r2, r3		@ toggle bit
 49	strex	ip, r2, [r1]
 50	cmp	ip, #0
 51	bne	1b
 52	smp_dmb
 53	cmp	r0, #0
 54	movne	r0, #1
 552:	bx	lr
 56UNWIND(	.fnend		)
 57ENDPROC(\name		)
 58	.endm
 59#else
 60	.macro	bitop, name, instr
 61ENTRY(	\name		)
 62UNWIND(	.fnstart	)
 63	ands	ip, r1, #3
 64	strneb	r1, [ip]		@ assert word-aligned
 65	and	r2, r0, #31
 66	mov	r0, r0, lsr #5
 67	mov	r3, #1
 68	mov	r3, r3, lsl r2
 69	save_and_disable_irqs ip
 70	ldr	r2, [r1, r0, lsl #2]
 71	\instr	r2, r2, r3
 72	str	r2, [r1, r0, lsl #2]
 73	restore_irqs ip
 74	ret	lr
 75UNWIND(	.fnend		)
 76ENDPROC(\name		)
 77	.endm
 78
 79/**
 80 * testop - implement a test_and_xxx_bit operation.
 81 * @instr: operational instruction
 82 * @store: store instruction
 83 *
 84 * Note: we can trivially conditionalise the store instruction
 85 * to avoid dirtying the data cache.
 86 */
 87	.macro	testop, name, instr, store
 88ENTRY(	\name		)
 89UNWIND(	.fnstart	)
 90	ands	ip, r1, #3
 91	strneb	r1, [ip]		@ assert word-aligned
 92	and	r3, r0, #31
 93	mov	r0, r0, lsr #5
 94	save_and_disable_irqs ip
 95	ldr	r2, [r1, r0, lsl #2]!
 96	mov	r0, #1
 97	tst	r2, r0, lsl r3
 98	\instr	r2, r2, r0, lsl r3
 99	\store	r2, [r1]
100	moveq	r0, #0
101	restore_irqs ip
102	ret	lr
103UNWIND(	.fnend		)
104ENDPROC(\name		)
105	.endm
106#endif

 
 
 
 1#if __LINUX_ARM_ARCH__ >= 6
 2	.macro	bitop, instr
 
 
 3	ands	ip, r1, #3
 4	strneb	r1, [ip]		@ assert word-aligned
 5	mov	r2, #1
 6	and	r3, r0, #31		@ Get bit offset
 7	mov	r0, r0, lsr #5
 8	add	r1, r1, r0, lsl #2	@ Get word offset
 
 
 
 
 
 9	mov	r3, r2, lsl r3
101:	ldrex	r2, [r1]
11	\instr	r2, r2, r3
12	strex	r0, r2, [r1]
13	cmp	r0, #0
14	bne	1b
15	bx	lr
 
 
16	.endm
17
18	.macro	testop, instr, store
 
 
19	ands	ip, r1, #3
20	strneb	r1, [ip]		@ assert word-aligned
21	mov	r2, #1
22	and	r3, r0, #31		@ Get bit offset
23	mov	r0, r0, lsr #5
24	add	r1, r1, r0, lsl #2	@ Get word offset
25	mov	r3, r2, lsl r3		@ create mask
26	smp_dmb
 
 
 
 
 
271:	ldrex	r2, [r1]
28	ands	r0, r2, r3		@ save old value of bit
29	\instr	r2, r2, r3		@ toggle bit
30	strex	ip, r2, [r1]
31	cmp	ip, #0
32	bne	1b
33	smp_dmb
34	cmp	r0, #0
35	movne	r0, #1
362:	bx	lr
 
 
37	.endm
38#else
39	.macro	bitop, instr
 
 
40	ands	ip, r1, #3
41	strneb	r1, [ip]		@ assert word-aligned
42	and	r2, r0, #31
43	mov	r0, r0, lsr #5
44	mov	r3, #1
45	mov	r3, r3, lsl r2
46	save_and_disable_irqs ip
47	ldr	r2, [r1, r0, lsl #2]
48	\instr	r2, r2, r3
49	str	r2, [r1, r0, lsl #2]
50	restore_irqs ip
51	mov	pc, lr
 
 
52	.endm
53
54/**
55 * testop - implement a test_and_xxx_bit operation.
56 * @instr: operational instruction
57 * @store: store instruction
58 *
59 * Note: we can trivially conditionalise the store instruction
60 * to avoid dirtying the data cache.
61 */
62	.macro	testop, instr, store
 
 
63	ands	ip, r1, #3
64	strneb	r1, [ip]		@ assert word-aligned
65	and	r3, r0, #31
66	mov	r0, r0, lsr #5
67	save_and_disable_irqs ip
68	ldr	r2, [r1, r0, lsl #2]!
69	mov	r0, #1
70	tst	r2, r0, lsl r3
71	\instr	r2, r2, r0, lsl r3
72	\store	r2, [r1]
73	moveq	r0, #0
74	restore_irqs ip
75	mov	pc, lr
 
 
76	.endm
77#endif