Author: andreast
Date: Mon Jan 13 22:21:29 2014
New Revision: 260610
URL: http://svnweb.freebsd.org/changeset/base/260610
Log:
Described in the man page but not implemented. Here it comes,
atomic_swap_32/64. The latter only for powerpc64.
MFC after: 1 month
Modified:
head/sys/powerpc/include/atomic.h
Modified: head/sys/powerpc/include/atomic.h
==============================================================================
--- head/sys/powerpc/include/atomic.h Mon Jan 13 22:15:57 2014
(r260609)
+++ head/sys/powerpc/include/atomic.h Mon Jan 13 22:21:29 2014
(r260610)
@@ -684,10 +684,47 @@ atomic_fetchadd_long(volatile u_long *p,
return (value);
}
+static __inline u_int
+atomic_swap_32(volatile u_int *p, u_int v)
+{
+ u_int prev;
+
+ __asm __volatile(
+ "1: lwarx %0,0,%2\n"
+ " stwcx. %3,0,%2\n"
+ " bne- 1b\n"
+ : "=&r" (prev), "+m" (*(volatile u_int *)p)
+ : "r" (p), "r" (v)
+ : "cc", "memory");
+
+ return (prev);
+}
+
+#ifdef __powerpc64__
+static __inline u_long
+atomic_swap_64(volatile u_long *p, u_long v)
+{
+ u_long prev;
+
+ __asm __volatile(
+ "1: ldarx %0,0,%2\n"
+ " stdcx. %3,0,%2\n"
+ " bne- 1b\n"
+ : "=&r" (prev), "+m" (*(volatile u_long *)p)
+ : "r" (p), "r" (v)
+ : "cc", "memory");
+
+ return (prev);
+}
+#endif
+
#define atomic_fetchadd_32 atomic_fetchadd_int
+#define atomic_swap_int atomic_swap_32
#ifdef __powerpc64__
#define atomic_fetchadd_64 atomic_fetchadd_long
+#define atomic_swap_long atomic_swap_64
+#define atomic_swap_ptr atomic_swap_64
#endif
#undef __ATOMIC_REL
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