svn commit: r246993 - projects/amd64_xen_pv/sys/amd64/include/xen

[Cherry G. Mathew]

Author: cherry
Date: Tue Feb 19 15:02:17 2013
New Revision: 246993
URL: http://svnweb.freebsd.org/changeset/base/246993

Log:
  Add assembler for 64bit locked exchange.
  
  Approved by: gibbs (implicit)

Modified:
  projects/amd64_xen_pv/sys/amd64/include/xen/xen-os.h

Modified: projects/amd64_xen_pv/sys/amd64/include/xen/xen-os.h
==============================================================================
--- projects/amd64_xen_pv/sys/amd64/include/xen/xen-os.h	Tue Feb 19 14:39:10 2013	(r246992)
+++ projects/amd64_xen_pv/sys/amd64/include/xen/xen-os.h	Tue Feb 19 15:02:17 2013	(r246993)
@@ -220,6 +220,11 @@ static __inline unsigned long __xchg(uns
                              :"=r" (x)
                              :"m" (*__xg(ptr)), "0" (x)
                              :"memory");
+    case 8:
+        __asm__ __volatile__("xchgq %0,%1"
+                             :"=r" (x)
+                             :"m" (*__xg(ptr)), "0" (x)
+                             :"memory");
         break;
     }
     return x;