--- a/hotspot/src/os_cpu/solaris_x86/vm/solaris_x86_64.il	Mon Dec 26 20:36:01 2011 -0500
+++ b/hotspot/src/os_cpu/solaris_x86/vm/solaris_x86_64.il	Sun Jan 01 11:17:59 2012 -0500
@@ -30,12 +30,19 @@
       movq     %fs:0, %rax 
       .end
 
-  // Get the frame pointer from current frame.
+  // Get current fp
       .inline _get_current_fp,0
       .volatile
       movq     %rbp, %rax 
       .end
 
+  // Support for os::rdtsc()
+      .inline _raw_rdtsc,0
+      rdtsc
+      salq     $32, %rdx
+      orq      %rdx, %rax
+      .end
+
   // Support for jint Atomic::add(jint add_value, volatile jint* dest)
       .inline _Atomic_add,2
       movl     %edi, %eax      // save add_value for return