Author: marcel
Date: Sun Feb 16 23:08:21 2014
New Revision: 262004
URL: http://svnweb.freebsd.org/changeset/base/262004
Log:
MFC r260175:
Implement atomic_swap_<type>.
Modified:
stable/10/sys/ia64/include/atomic.h
Directory Properties:
stable/10/ (props changed)
Modified: stable/10/sys/ia64/include/atomic.h
==============================================================================
--- stable/10/sys/ia64/include/atomic.h Sun Feb 16 22:48:36 2014
(r262003)
+++ stable/10/sys/ia64/include/atomic.h Sun Feb 16 23:08:21 2014
(r262004)
@@ -386,4 +386,32 @@ atomic_fetchadd_long(volatile u_long *p,
return (value);
}
+/*
+ * <type> atomic_swap_<type>(volatile <type> *p, <type> v);
+ */
+
+static __inline uint32_t
+atomic_swap_32(volatile uint32_t *p, uint32_t v)
+{
+ uint32_t r;
+
+ __asm __volatile ("xchg4 %0 = %3, %2;;" : "=r"(r), "=m"(*p) :
+ "r"(v), "m"(*p) : "memory");
+ return (r);
+}
+
+static __inline uint64_t
+atomic_swap_64(volatile uint64_t *p, uint64_t v)
+{
+ uint64_t r;
+
+ __asm __volatile ("xchg8 %0 = %3, %2;;" : "=r"(r), "=m"(*p) :
+ "r"(v), "m"(*p) : "memory");
+ return (r);
+}
+
+#define atomic_swap_int atomic_swap_32
+#define atomic_swap_long atomic_swap_64
+#define atomic_swap_ptr atomic_swap_64
+
#endif /* ! _MACHINE_ATOMIC_H_ */
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