# Node ID f125c1f2f5f735f2b686dea78fcc067c4fe390b4
# Parent  2d9d11e4391eac76493f43e3945556aa4ce76ad5
diff --git a/src/arch/x86/isa/decoder/two_byte_opcodes.isa b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
--- a/src/arch/x86/isa/decoder/two_byte_opcodes.isa
+++ b/src/arch/x86/isa/decoder/two_byte_opcodes.isa
@@ -1,4 +1,5 @@
 // Copyright (c) 2007-2008 The Hewlett-Packard Development Company
+// Copyright (c) 2012-2013 AMD
 // All rights reserved.
 //
 // The license below extends only to copyright in the software and shall
@@ -361,6 +362,11 @@
                     0x3: MOV(Dd,Rd);
                     default: UD2();
                 }
+                // operand size (0x66)
+                0x1: decode OPCODE_OP_BOTTOM3 {
+                    0x0: MOV(Rd,Cd);
+                    0x2: MOV(Cd,Rd);
+                }
                 default: UD2();
             }
             0x05: decode LEGACY_DECODEVAL {
diff --git a/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py b/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
--- a/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
+++ b/src/arch/x86/isa/insts/general_purpose/control_transfer/jump.py
@@ -1,4 +1,5 @@
 # Copyright (c) 2007 The Hewlett-Packard Development Company
+# Copyright (c) 2012-2013 AMD
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -127,9 +128,9 @@
     rcri t0, t4, 13, flags=(ECF,), dataSize=2
     br rom_local_label("farJmpSystemDescriptor"), flags=(nCECF,)
     chks t2, t4, CSCheck, dataSize=8
-    wrdl cs, t4, t2
-    wrsel cs, t2
-    wrip t0, t1
+    wrdl cs, t4, t2, dataSize=4
+    wrsel cs, t2, dataSize=4
+    wrip t0, t1, dataSize=4
     eret
 
 farJmpSystemDescriptor:
diff --git a/src/arch/x86/isa/insts/system/segmentation.py b/src/arch/x86/isa/insts/system/segmentation.py
--- a/src/arch/x86/isa/insts/system/segmentation.py
+++ b/src/arch/x86/isa/insts/system/segmentation.py
@@ -1,4 +1,5 @@
 # Copyright (c) 2007 The Hewlett-Packard Development Company
+# Copyright (c) 2012-2013 AMD
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -78,7 +79,7 @@
     # Get the base
     ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
     zexti t2, t2, 23, dataSize=8
-    wrbase tsg, t2
+    wrbase tsg, t2, dataSize=8
     wrlimit tsg, t1
 };
 
@@ -139,7 +140,7 @@
     # Get the base
     ld t2, seg, sib, 'adjustedDisp + 2', dataSize=4
     zexti t2, t2, 23, dataSize=8
-    wrbase idtr, t2
+    wrbase idtr, t2, dataSize=8
     wrlimit idtr, t1
 };