summaryrefslogtreecommitdiffstats
path: root/arch/ppc/kernel/bitops.c
blob: 7f53d193968b423b239586ccd502841d624aac84 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
/*
 * Copyright (C) 1996 Paul Mackerras.
 */

#include <linux/kernel.h>
#include <linux/bitops.h>

/*
 * If the bitops are not inlined in bitops.h, they are defined here.
 *  -- paulus
 */
#if !__INLINE_BITOPS
void set_bit(int nr, volatile void * addr)
{
	unsigned long old;
	unsigned long mask = 1 << (nr & 0x1f);
	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);
	
	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%3 \n\
	or	%0,%0,%2 \n"
	PPC405_ERR77(0,%3)
"	stwcx.	%0,0,%3 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc" );
}

void clear_bit(int nr, volatile void *addr)
{
	unsigned long old;
	unsigned long mask = 1 << (nr & 0x1f);
	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);

	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%3 \n\
	andc	%0,%0,%2 \n"
	PPC405_ERR77(0,%3)
"	stwcx.	%0,0,%3 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc");
}

void change_bit(int nr, volatile void *addr)
{
	unsigned long old;
	unsigned long mask = 1 << (nr & 0x1f);
	unsigned long *p = ((unsigned long *)addr) + (nr >> 5);

	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%3 \n\
	xor	%0,%0,%2 \n"
	PPC405_ERR77(0,%3)
"	stwcx.	%0,0,%3 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc");
}

int test_and_set_bit(int nr, volatile void *addr)
{
	unsigned int old, t;
	unsigned int mask = 1 << (nr & 0x1f);
	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);

	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%4 \n\
	or	%1,%0,%3 \n"
	PPC405_ERR77(0,%4)
"	stwcx.	%1,0,%4 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=&r" (t), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc");

	return (old & mask) != 0;
}

int test_and_clear_bit(int nr, volatile void *addr)
{
	unsigned int old, t;
	unsigned int mask = 1 << (nr & 0x1f);
	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);

	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%4 \n\
	andc	%1,%0,%3 \n"
	PPC405_ERR77(0,%4)
"	stwcx.	%1,0,%4 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=&r" (t), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc");

	return (old & mask) != 0;
}

int test_and_change_bit(int nr, volatile void *addr)
{
	unsigned int old, t;
	unsigned int mask = 1 << (nr & 0x1f);
	volatile unsigned int *p = ((volatile unsigned int *)addr) + (nr >> 5);

	__asm__ __volatile__(SMP_WMB "\n\
1:	lwarx	%0,0,%4 \n\
	xor	%1,%0,%3 \n"
	PPC405_ERR77(0,%4)
"	stwcx.	%1,0,%4 \n\
	bne	1b"
	SMP_MB
	: "=&r" (old), "=&r" (t), "=m" (*p)
	: "r" (mask), "r" (p), "m" (*p)
	: "cc");

	return (old & mask) != 0;
}
#endif /* !__INLINE_BITOPS */
OpenPOWER on IntegriCloud