svn commit: r224313 - stable/8/sys/sparc64/include

[Marius Strobl]

Author: marius
Date: Mon Jul 25 14:42:34 2011
New Revision: 224313
URL: http://svn.freebsd.org/changeset/base/224313

Log:
  MFC: r221750
  
  Add an ATOMIC_CLEAR_LONG.

Modified:
  stable/8/sys/sparc64/include/asmacros.h
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/geom/label/   (props changed)

Modified: stable/8/sys/sparc64/include/asmacros.h
==============================================================================
--- stable/8/sys/sparc64/include/asmacros.h	Mon Jul 25 14:39:22 2011	(r224312)
+++ stable/8/sys/sparc64/include/asmacros.h	Mon Jul 25 14:42:34 2011	(r224313)
@@ -90,6 +90,17 @@
 	bne,pn	%icc, 9b ; \
 	 mov	r3, r2
 
+/*
+ * Atomically clear a number of bits of an u_long in memory.
+ */
+#define	ATOMIC_CLEAR_LONG(r1, r2, r3, bits) \
+	ldx	[r1], r2 ; \
+9:	andn	r2, bits, r3 ; \
+	casxa	[r1] ASI_N, r2, r3 ; \
+	cmp	r2, r3 ; \
+	bne,pn	%icc, 9b ; \
+	 mov	r3, r2
+
 #define	PCPU(member)	PCPU_REG + PC_ ## member
 #define	PCPU_ADDR(member, reg) \
 	add	PCPU_REG, PC_ ## member, reg