1 #ifndef _URCU_UATOMIC_ARCH_S390_H
2 #define _URCU_UATOMIC_ARCH_S390_H
5 * Atomic exchange operations for the S390 architecture. Based on information
6 * taken from the Principles of Operation Appendix A "Conditional Swapping
7 * Instructions (CS, CDS)".
9 * Copyright (c) 2009 Novell, Inc.
10 * Author: Jan Blunck <jblunck@suse.de>
11 * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
13 * Permission is hereby granted, free of charge, to any person obtaining a copy
14 * of this software and associated documentation files (the "Software"), to
15 * deal in the Software without restriction, including without limitation the
16 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
17 * sell copies of the Software, and to permit persons to whom the Software is
18 * furnished to do so, subject to the following conditions:
20 * The above copyright notice and this permission notice shall be included in
21 * all copies or substantial portions of the Software.
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
32 #include <urcu/compiler.h>
33 #include <urcu/system.h>
35 #ifndef __SIZEOF_LONG__
37 #define __SIZEOF_LONG__ 8
39 #define __SIZEOF_LONG__ 4
44 #define BITS_PER_LONG (__SIZEOF_LONG__ * 8)
47 #define uatomic_set(addr, v) STORE_SHARED(*(addr), (v))
48 #define uatomic_read(addr) LOAD_SHARED(*(addr))
52 static inline __attribute__((always_inline
))
53 unsigned long _uatomic_exchange(volatile void *addr
, unsigned long val
, int len
)
63 : "=&r"(old_val
), "=m" (*addr
)
64 : "r"(val
), "m" (*addr
)
68 #if (BITS_PER_LONG == 64)
71 unsigned long old_val
;
76 : "=&r"(old_val
), "=m" (*addr
)
77 : "r"(val
), "m" (*addr
)
83 __asm__
__volatile__(".long 0xd00d00");
89 #define uatomic_xchg(addr, v) \
90 (__typeof__(*(addr))) _uatomic_exchange((addr), (unsigned long)(v), \
95 static inline __attribute__((always_inline
))
96 unsigned long _uatomic_cmpxchg(void *addr
, unsigned long old
,
97 unsigned long _new
, int len
)
102 unsigned int old_val
= (unsigned int)old
;
104 __asm__
__volatile__(
106 : "+r"(old_val
), "+m"(*addr
)
111 #if (BITS_PER_LONG == 64)
114 __asm__
__volatile__(
116 : "+r"(old
), "+m"(*addr
)
123 __asm__
__volatile__(".long 0xd00d00");
129 #define uatomic_cmpxchg(addr, old, _new) \
130 (__typeof__(*(addr))) _uatomic_cmpxchg((addr), \
131 (unsigned long)(old), \
132 (unsigned long)(_new), \
135 /* uatomic_add_return */
137 static inline __attribute__((always_inline
))
138 unsigned long _uatomic_add_return(void *addr
, unsigned long val
, int len
)
143 unsigned int old
, oldt
;
145 oldt
= uatomic_read((unsigned int *)addr
);
148 oldt
= _uatomic_cmpxchg(addr
, old
, old
+ val
, 4);
149 } while (oldt
!= old
);
153 #if (BITS_PER_LONG == 64)
156 unsigned long old
, oldt
;
158 oldt
= uatomic_read((unsigned long *)addr
);
161 oldt
= _uatomic_cmpxchg(addr
, old
, old
+ val
, 8);
162 } while (oldt
!= old
);
172 #define uatomic_add_return(addr, v) \
173 ((__typeof__(*(addr))) _uatomic_add_return((addr), \
174 (unsigned long)(v), \
177 /* uatomic_sub_return, uatomic_add, uatomic_sub, uatomic_inc, uatomic_dec */
179 #define uatomic_sub_return(addr, v) uatomic_add_return((addr), -(v))
181 #define uatomic_add(addr, v) (void)uatomic_add_return((addr), (v))
182 #define uatomic_sub(addr, v) (void)uatomic_sub_return((addr), (v))
184 #define uatomic_inc(addr) uatomic_add((addr), 1)
185 #define uatomic_dec(addr) uatomic_add((addr), -1)
187 #define compat_uatomic_cmpxchg(ptr, old, _new) uatomic_cmpxchg(ptr, old, _new)
189 #endif /* _URCU_UATOMIC_ARCH_S390_H */
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