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/*
 * PowerPC64 atomic operations
 *
 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
 
#ifndef _ASM_PPC64_ATOMIC_H_ 
#define _ASM_PPC64_ATOMIC_H_
 
#include <asm/memory.h>
 
typedef struct { volatile int counter; } atomic_t;
 
#define ATOMIC_INIT(i)  { (i) }
 
#define atomic_read(v)          ((v)->counter)
#define atomic_set(v,i)         (((v)->counter) = (i))
 
static __inline__ void atomic_add(int a, atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%3         # atomic_add\n\
        add     %0,%2,%0\n\
        stwcx.  %0,0,%3\n\
        bne-    1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (a), "r" (&v->counter), "m" (v->counter)
        : "cc");
}
 
static __inline__ int atomic_add_return(int a, atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%2         # atomic_add_return\n\
        add     %0,%1,%0\n\
        stwcx.  %0,0,%2\n\
        bne-    1b"
        ISYNC_ON_SMP
        : "=&r" (t)
        : "r" (a), "r" (&v->counter)
        : "cc", "memory");
 
        return t;
}
 
static __inline__ void atomic_sub(int a, atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%3         # atomic_sub\n\
        subf    %0,%2,%0\n\
        stwcx.  %0,0,%3\n\
        bne-    1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (a), "r" (&v->counter), "m" (v->counter)
        : "cc");
}
 
static __inline__ int atomic_sub_return(int a, atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%2         # atomic_sub_return\n\
        subf    %0,%1,%0\n\
        stwcx.  %0,0,%2\n\
        bne-    1b"
        ISYNC_ON_SMP
        : "=&r" (t)
        : "r" (a), "r" (&v->counter)
        : "cc", "memory");
 
        return t;
}
 
static __inline__ void atomic_inc(atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%2         # atomic_inc\n\
        addic   %0,%0,1\n\
        stwcx.  %0,0,%2\n\
        bne-    1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (&v->counter), "m" (v->counter)
        : "cc");
}
 
static __inline__ int atomic_inc_return(atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%1         # atomic_inc_return\n\
        addic   %0,%0,1\n\
        stwcx.  %0,0,%1\n\
        bne-    1b"
        ISYNC_ON_SMP
        : "=&r" (t)
        : "r" (&v->counter)
        : "cc", "memory");
 
        return t;
}
 
static __inline__ void atomic_dec(atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%2         # atomic_dec\n\
        addic   %0,%0,-1\n\
        stwcx.  %0,0,%2\n\
        bne-    1b"
        : "=&r" (t), "=m" (v->counter)
        : "r" (&v->counter), "m" (v->counter)
        : "cc");
}
 
static __inline__ int atomic_dec_return(atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%1         # atomic_dec_return\n\
        addic   %0,%0,-1\n\
        stwcx.  %0,0,%1\n\
        bne-    1b"
        ISYNC_ON_SMP
        : "=&r" (t)
        : "r" (&v->counter)
        : "cc", "memory");
 
        return t;
}
 
#define atomic_sub_and_test(a, v)       (atomic_sub_return((a), (v)) == 0)
#define atomic_dec_and_test(v)          (atomic_dec_return((v)) == 0)
 
/*
 * Atomically test *v and decrement if it is greater than 0.
 * The function returns the old value of *v minus 1.
 */
static __inline__ int atomic_dec_if_positive(atomic_t *v)
{
        int t;
 
        __asm__ __volatile__(
"1:     lwarx   %0,0,%1         # atomic_dec_if_positive\n\
        addic.  %0,%0,-1\n\
        blt-    2f\n\
        stwcx.  %0,0,%1\n\
        bne-    1b"
        ISYNC_ON_SMP
        "\n\
2:"     : "=&r" (t)
        : "r" (&v->counter)
        : "cc", "memory");
 
        return t;
}
 
#define smp_mb__before_atomic_dec()     smp_mb()
#define smp_mb__after_atomic_dec()      smp_mb()
#define smp_mb__before_atomic_inc()     smp_mb()
#define smp_mb__after_atomic_inc()      smp_mb()
 
#endif /* _ASM_PPC64_ATOMIC_H_ */

Line No.	Rev	Author	Line
1	1275	phoenix	`/*`
2			`* PowerPC64 atomic operations`
3			`*`
4			`* Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM`
5			`* Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM`
6			`*`
7			`* This program is free software; you can redistribute it and/or`
8			`* modify it under the terms of the GNU General Public License`
9			`* as published by the Free Software Foundation; either version`
10			`* 2 of the License, or (at your option) any later version.`
11			`*/`
12
13			`#ifndef _ASM_PPC64_ATOMIC_H_`
14			`#define _ASM_PPC64_ATOMIC_H_`
15
16			`#include <asm/memory.h>`
17
18			`typedef struct { volatile int counter; } atomic_t;`
19
20			`#define ATOMIC_INIT(i) { (i) }`
21
22			`#define atomic_read(v) ((v)->counter)`
23			`#define atomic_set(v,i) (((v)->counter) = (i))`
24
25			`static __inline__ void atomic_add(int a, atomic_t *v)`
26			`{`
27			`int t;`
28
29			`__asm__ __volatile__(`
30			`"1: lwarx %0,0,%3 # atomic_add\n\`
31			`add %0,%2,%0\n\`
32			`stwcx. %0,0,%3\n\`
33			`bne- 1b"`
34			`: "=&r" (t), "=m" (v->counter)`
35			`: "r" (a), "r" (&v->counter), "m" (v->counter)`
36			`: "cc");`
37			`}`
38
39			`static __inline__ int atomic_add_return(int a, atomic_t *v)`
40			`{`
41			`int t;`
42
43			`__asm__ __volatile__(`
44			`"1: lwarx %0,0,%2 # atomic_add_return\n\`
45			`add %0,%1,%0\n\`
46			`stwcx. %0,0,%2\n\`
47			`bne- 1b"`
48			`ISYNC_ON_SMP`
49			`: "=&r" (t)`
50			`: "r" (a), "r" (&v->counter)`
51			`: "cc", "memory");`
52
53			`return t;`
54			`}`
55
56			`static __inline__ void atomic_sub(int a, atomic_t *v)`
57			`{`
58			`int t;`
59
60			`__asm__ __volatile__(`
61			`"1: lwarx %0,0,%3 # atomic_sub\n\`
62			`subf %0,%2,%0\n\`
63			`stwcx. %0,0,%3\n\`
64			`bne- 1b"`
65			`: "=&r" (t), "=m" (v->counter)`
66			`: "r" (a), "r" (&v->counter), "m" (v->counter)`
67			`: "cc");`
68			`}`
69
70			`static __inline__ int atomic_sub_return(int a, atomic_t *v)`
71			`{`
72			`int t;`
73
74			`__asm__ __volatile__(`
75			`"1: lwarx %0,0,%2 # atomic_sub_return\n\`
76			`subf %0,%1,%0\n\`
77			`stwcx. %0,0,%2\n\`
78			`bne- 1b"`
79			`ISYNC_ON_SMP`
80			`: "=&r" (t)`
81			`: "r" (a), "r" (&v->counter)`
82			`: "cc", "memory");`
83
84			`return t;`
85			`}`
86
87			`static __inline__ void atomic_inc(atomic_t *v)`
88			`{`
89			`int t;`
90
91			`__asm__ __volatile__(`
92			`"1: lwarx %0,0,%2 # atomic_inc\n\`
93			`addic %0,%0,1\n\`
94			`stwcx. %0,0,%2\n\`
95			`bne- 1b"`
96			`: "=&r" (t), "=m" (v->counter)`
97			`: "r" (&v->counter), "m" (v->counter)`
98			`: "cc");`
99			`}`
100
101			`static __inline__ int atomic_inc_return(atomic_t *v)`
102			`{`
103			`int t;`
104
105			`__asm__ __volatile__(`
106			`"1: lwarx %0,0,%1 # atomic_inc_return\n\`
107			`addic %0,%0,1\n\`
108			`stwcx. %0,0,%1\n\`
109			`bne- 1b"`
110			`ISYNC_ON_SMP`
111			`: "=&r" (t)`
112			`: "r" (&v->counter)`
113			`: "cc", "memory");`
114
115			`return t;`
116			`}`
117
118			`static __inline__ void atomic_dec(atomic_t *v)`
119			`{`
120			`int t;`
121
122			`__asm__ __volatile__(`
123			`"1: lwarx %0,0,%2 # atomic_dec\n\`
124			`addic %0,%0,-1\n\`
125			`stwcx. %0,0,%2\n\`
126			`bne- 1b"`
127			`: "=&r" (t), "=m" (v->counter)`
128			`: "r" (&v->counter), "m" (v->counter)`
129			`: "cc");`
130			`}`
131
132			`static __inline__ int atomic_dec_return(atomic_t *v)`
133			`{`
134			`int t;`
135
136			`__asm__ __volatile__(`
137			`"1: lwarx %0,0,%1 # atomic_dec_return\n\`
138			`addic %0,%0,-1\n\`
139			`stwcx. %0,0,%1\n\`
140			`bne- 1b"`
141			`ISYNC_ON_SMP`
142			`: "=&r" (t)`
143			`: "r" (&v->counter)`
144			`: "cc", "memory");`
145
146			`return t;`
147			`}`
148
149			`#define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)`
150			`#define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)`
151
152			`/*`
153			`* Atomically test *v and decrement if it is greater than 0.`
154			`* The function returns the old value of *v minus 1.`
155			`*/`
156			`static __inline__ int atomic_dec_if_positive(atomic_t *v)`
157			`{`
158			`int t;`
159
160			`__asm__ __volatile__(`
161			`"1: lwarx %0,0,%1 # atomic_dec_if_positive\n\`
162			`addic. %0,%0,-1\n\`
163			`blt- 2f\n\`
164			`stwcx. %0,0,%1\n\`
165			`bne- 1b"`
166			`ISYNC_ON_SMP`
167			`"\n\`
168			`2:" : "=&r" (t)`
169			`: "r" (&v->counter)`
170			`: "cc", "memory");`
171
172			`return t;`
173			`}`
174
175			`#define smp_mb__before_atomic_dec() smp_mb()`
176			`#define smp_mb__after_atomic_dec() smp_mb()`
177			`#define smp_mb__before_atomic_inc() smp_mb()`
178			`#define smp_mb__after_atomic_inc() smp_mb()`
179
180			`#endif /* _ASM_PPC64_ATOMIC_H_ */`

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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-ppc64/] [atomic.h] - Blame information for rev 1765