2 * Copyright (c) 2007 Warner Losh
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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30 #define ISC_ATOMIC_H 1
32 #include <isc/platform.h>
33 #include <isc/types.h>
34 #include <machine/atomic.h>
37 static inline isc_int32_t
38 isc_atomic_xadd(isc_int32_t *p, isc_int32_t val)
40 return atomic_fetchadd_int(p, val);
44 isc_atomic_store(isc_int32_t *p, isc_int32_t val)
46 atomic_store_rel_int(p, val);
49 static inline isc_int32_t
50 isc_atomic_cmpxchg(isc_int32_t *p, isc_int32_t cmpval, isc_int32_t val)
52 register int done, ras_start;
54 __asm __volatile("1:\n"
56 "mov %0, #0xe0000004\n"
58 "mov %0, #0xe0000008\n"
66 "mov %0, #0xe0000004\n"
68 "mov %3, #0xffffffff\n"
69 "mov %0, #0xe0000008\n"
71 : "=r" (ras_start), "=r" (done)
72 ,"+r" (p), "+r" (cmpval), "+r" (val) : : "memory");
78 #error "unsupported compiler. disable atomic ops by --disable-atomic"
81 #endif /* ISC_ATOMIC_H */