1 #ifndef __ARCH_S390_ATOMIC__
2 #define __ARCH_S390_ATOMIC__
5 * include/asm-s390/atomic.h
8 * Copyright (C) 1999-2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
9 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
10 * Denis Joseph Barrow,
11 * Arnd Bergmann (arndb@de.ibm.com)
13 * Derived from "include/asm-i386/bitops.h"
14 * Copyright (C) 1992, Linus Torvalds
19 * Atomic operations that C can't guarantee us. Useful for
20 * resource counting etc..
21 * S390 uses 'Compare And Swap' for atomicity in SMP enviroment
26 } __attribute__ ((aligned (4))) atomic_t;
27 #define ATOMIC_INIT(i) { (i) }
31 #define __CS_LOOP(ptr, op_val, op_string) ({ \
32 typeof(ptr->counter) old_val, new_val; \
33 __asm__ __volatile__(" l %0,0(%3)\n" \
35 op_string " %1,%4\n" \
38 : "=&d" (old_val), "=&d" (new_val), \
39 "=m" (((atomic_t *)(ptr))->counter) \
40 : "a" (ptr), "d" (op_val), \
41 "m" (((atomic_t *)(ptr))->counter) \
45 #define atomic_read(v) ((v)->counter)
46 #define atomic_set(v,i) (((v)->counter) = (i))
48 static __inline__ int atomic_add_return(int i, atomic_t * v)
50 return __CS_LOOP(v, i, "ar");
52 #define atomic_add(_i, _v) atomic_add_return(_i, _v)
53 #define atomic_add_negative(_i, _v) (atomic_add_return(_i, _v) < 0)
54 #define atomic_inc(_v) atomic_add_return(1, _v)
55 #define atomic_inc_return(_v) atomic_add_return(1, _v)
56 #define atomic_inc_and_test(_v) (atomic_add_return(1, _v) == 0)
58 static __inline__ int atomic_sub_return(int i, atomic_t * v)
60 return __CS_LOOP(v, i, "sr");
62 #define atomic_sub(_i, _v) atomic_sub_return(_i, _v)
63 #define atomic_sub_and_test(_i, _v) (atomic_sub_return(_i, _v) == 0)
64 #define atomic_dec(_v) atomic_sub_return(1, _v)
65 #define atomic_dec_return(_v) atomic_sub_return(1, _v)
66 #define atomic_dec_and_test(_v) (atomic_sub_return(1, _v) == 0)
68 static __inline__ void atomic_clear_mask(unsigned long mask, atomic_t * v)
70 __CS_LOOP(v, ~mask, "nr");
73 static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v)
75 __CS_LOOP(v, mask, "or");
78 static __inline__ int atomic_cmpxchg(atomic_t *v, int old, int new)
80 __asm__ __volatile__(" cs %0,%3,0(%2)\n"
81 : "+d" (old), "=m" (v->counter)
82 : "a" (v), "d" (new), "m" (v->counter)
87 static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
92 while (c != u && (old = atomic_cmpxchg(v, c, c + a)) != c)
97 #define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
103 volatile long long counter;
104 } __attribute__ ((aligned (8))) atomic64_t;
105 #define ATOMIC64_INIT(i) { (i) }
107 #define __CSG_LOOP(ptr, op_val, op_string) ({ \
108 typeof(ptr->counter) old_val, new_val; \
109 __asm__ __volatile__(" lg %0,0(%3)\n" \
111 op_string " %1,%4\n" \
112 " csg %0,%1,0(%3)\n" \
114 : "=&d" (old_val), "=&d" (new_val), \
115 "=m" (((atomic_t *)(ptr))->counter) \
116 : "a" (ptr), "d" (op_val), \
117 "m" (((atomic_t *)(ptr))->counter) \
118 : "cc", "memory" ); \
121 #define atomic64_read(v) ((v)->counter)
122 #define atomic64_set(v,i) (((v)->counter) = (i))
124 static __inline__ long long atomic64_add_return(long long i, atomic64_t * v)
126 return __CSG_LOOP(v, i, "agr");
128 #define atomic64_add(_i, _v) atomic64_add_return(_i, _v)
129 #define atomic64_add_negative(_i, _v) (atomic64_add_return(_i, _v) < 0)
130 #define atomic64_inc(_v) atomic64_add_return(1, _v)
131 #define atomic64_inc_return(_v) atomic64_add_return(1, _v)
132 #define atomic64_inc_and_test(_v) (atomic64_add_return(1, _v) == 0)
134 static __inline__ long long atomic64_sub_return(long long i, atomic64_t * v)
136 return __CSG_LOOP(v, i, "sgr");
138 #define atomic64_sub(_i, _v) atomic64_sub_return(_i, _v)
139 #define atomic64_sub_and_test(_i, _v) (atomic64_sub_return(_i, _v) == 0)
140 #define atomic64_dec(_v) atomic64_sub_return(1, _v)
141 #define atomic64_dec_return(_v) atomic64_sub_return(1, _v)
142 #define atomic64_dec_and_test(_v) (atomic64_sub_return(1, _v) == 0)
144 static __inline__ void atomic64_clear_mask(unsigned long mask, atomic64_t * v)
146 __CSG_LOOP(v, ~mask, "ngr");
149 static __inline__ void atomic64_set_mask(unsigned long mask, atomic64_t * v)
151 __CSG_LOOP(v, mask, "ogr");
154 static __inline__ long long atomic64_cmpxchg(atomic64_t *v,
155 long long old, long long new)
157 __asm__ __volatile__(" csg %0,%3,0(%2)\n"
158 : "+d" (old), "=m" (v->counter)
159 : "a" (v), "d" (new), "m" (v->counter)
164 static __inline__ int atomic64_add_unless(atomic64_t *v,
165 long long a, long long u)
169 c = atomic64_read(v);
170 while (c != u && (old = atomic64_cmpxchg(v, c, c + a)) != c)
175 #define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
180 #define smp_mb__before_atomic_dec() smp_mb()
181 #define smp_mb__after_atomic_dec() smp_mb()
182 #define smp_mb__before_atomic_inc() smp_mb()
183 #define smp_mb__after_atomic_inc() smp_mb()
185 #include <asm-generic/atomic.h>
186 #endif /* __KERNEL__ */
187 #endif /* __ARCH_S390_ATOMIC__ */