2 * PowerPC64 atomic operations
4 * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
5 * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
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.
13 #ifndef _ASM_PPC64_ATOMIC_H_
14 #define _ASM_PPC64_ATOMIC_H_
16 #include <asm/memory.h>
22 typedef struct { volatile int counter
; } atomic_t
;
24 #define ATOMIC_INIT(i) { (i) }
26 #define atomic_read(v) ((v)->counter)
27 #define atomic_set(v,i) (((v)->counter) = (i))
29 static __inline__
void atomic_add(int a
, atomic_t
*v
)
34 "1: lwarx %0,0,%3 # atomic_add\n\
38 : "=&r" (t
), "=m" (v
->counter
)
39 : "r" (a
), "r" (&v
->counter
), "m" (v
->counter
)
43 static __inline__
int atomic_add_return(int a
, atomic_t
*v
)
49 "1: lwarx %0,0,%2 # atomic_add_return\n\
55 : "r" (a
), "r" (&v
->counter
)
61 #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
63 static __inline__
void atomic_sub(int a
, atomic_t
*v
)
68 "1: lwarx %0,0,%3 # atomic_sub\n\
72 : "=&r" (t
), "=m" (v
->counter
)
73 : "r" (a
), "r" (&v
->counter
), "m" (v
->counter
)
77 static __inline__
int atomic_sub_return(int a
, atomic_t
*v
)
83 "1: lwarx %0,0,%2 # atomic_sub_return\n\
89 : "r" (a
), "r" (&v
->counter
)
95 static __inline__
void atomic_inc(atomic_t
*v
)
100 "1: lwarx %0,0,%2 # atomic_inc\n\
104 : "=&r" (t
), "=m" (v
->counter
)
105 : "r" (&v
->counter
), "m" (v
->counter
)
109 static __inline__
int atomic_inc_return(atomic_t
*v
)
113 __asm__
__volatile__(
115 "1: lwarx %0,0,%1 # atomic_inc_return\n\
128 * atomic_inc_and_test - increment and test
129 * @v: pointer of type atomic_t
131 * Atomically increments @v by 1
132 * and returns true if the result is zero, or false for all
135 #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
137 static __inline__
void atomic_dec(atomic_t
*v
)
141 __asm__
__volatile__(
142 "1: lwarx %0,0,%2 # atomic_dec\n\
146 : "=&r" (t
), "=m" (v
->counter
)
147 : "r" (&v
->counter
), "m" (v
->counter
)
151 static __inline__
int atomic_dec_return(atomic_t
*v
)
155 __asm__
__volatile__(
157 "1: lwarx %0,0,%1 # atomic_dec_return\n\
169 #define atomic_sub_and_test(a, v) (atomic_sub_return((a), (v)) == 0)
170 #define atomic_dec_and_test(v) (atomic_dec_return((v)) == 0)
173 * Atomically test *v and decrement if it is greater than 0.
174 * The function returns the old value of *v minus 1.
176 static __inline__
int atomic_dec_if_positive(atomic_t
*v
)
180 __asm__
__volatile__(
182 "1: lwarx %0,0,%1 # atomic_dec_if_positive\n\
196 #define smp_mb__before_atomic_dec() smp_mb()
197 #define smp_mb__after_atomic_dec() smp_mb()
198 #define smp_mb__before_atomic_inc() smp_mb()
199 #define smp_mb__after_atomic_inc() smp_mb()
202 } /* end of extern "C" */
205 #endif /* _ASM_PPC64_ATOMIC_H_ */
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