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40 /* PROLOG END TAG zYx */
42 * atomic.h - PPE atomic SHM counter operations.
44 * Interfaces patterned after, and hopefully compatible
45 * with PowerPC64-Linux atomic counter operations. Uses
46 * 32b values for various counters.
48 #ifndef _PPU_ATOMIC_H_
49 #define _PPU_ATOMIC_H_
51 #include <ppu_intrinsics.h>
52 #include "sync_utils.h"
54 typedef unsigned int atomic_t __attribute__ ((aligned (128)));
57 /* atomic_ea_t is a 64bit effective address that points to
58 * an atomic_t variable
60 typedef unsigned long long atomic_ea_t;
64 * On the PPE, the size of a reservation granule is 128 bytes
65 * (a cache-line), so when a programmer puts a reservation on an
66 * address, that whole cacheline is reserved. Therefore both
67 * the PPE and SPE can participate in an atomic operation as long as
68 * lwarx and getllar operate on the same cacheline.
73 * atomically loads and replaces the value v with val.
74 * Returns the old value at v
76 static __inline int _atomic_replace(atomic_ea_t v, int val)
81 SYNC_ULL_TO_PTR(v, p);
84 old = (int)__lwarx(p);
85 } while (__stwcx(p, (unsigned int)val) == 0);
92 * atomically loads the value at v, adds val, replaces the
93 * value at v with the sum. Returns the old value at v
95 static __inline int _atomic_modify(atomic_ea_t v, int val)
100 SYNC_ULL_TO_PTR(v, p);
103 oldval = (int)__lwarx(p);
104 newval = oldval + val;
105 } while (__stwcx(p, (unsigned int)newval) == 0);
111 #endif /* _PPU_ATOMIC_H_ */