diff --git a/src/arch/arm/isa.hh b/src/arch/arm/isa.hh
index a7bb1cc3e..8d547f9c6 100644
--- a/src/arch/arm/isa.hh
+++ b/src/arch/arm/isa.hh
@@ -110,7 +110,11 @@ namespace ArmISA
              * Technically this should be 0, but we don't support those
              * settings.
              */
-            miscRegs[MISCREG_CPACR] = 0x0fffffff;
+            CPACR cpacr = 0;
+            // Enable CP 10, 11
+            cpacr.cp10 = 0x3;
+            cpacr.cp11 = 0x3;
+            miscRegs[MISCREG_CPACR] = cpacr;
 
             /* One region, unified map. */
             miscRegs[MISCREG_MPUIR] = 0x100;
@@ -249,9 +253,15 @@ namespace ArmISA
             }
             switch (misc_reg) {
               case MISCREG_CPACR:
-                newVal = bits(val, 27, 0);
-                if (newVal != 0x0fffffff) {
-                    panic("Disabling coprocessors isn't implemented.\n");
+                {
+                    CPACR newCpacr = 0;
+                    CPACR valCpacr = val;
+                    newCpacr.cp10 = valCpacr.cp10;
+                    newCpacr.cp11 = valCpacr.cp11;
+                    if (newCpacr.cp10 != 0x3 || newCpacr.cp11 != 3) {
+                        panic("Disabling coprocessors isn't implemented.\n");
+                    }
+                    newVal = newCpacr;
                 }
                 break;
               case MISCREG_CSSELR:
diff --git a/src/arch/arm/miscregs.hh b/src/arch/arm/miscregs.hh
index 704450d1c..74be52c66 100644
--- a/src/arch/arm/miscregs.hh
+++ b/src/arch/arm/miscregs.hh
@@ -230,6 +230,25 @@ namespace ArmISA
         Bitfield<1>  a;   // Alignment fault checking
         Bitfield<0>  m;   // MMU enable bit 
     EndBitUnion(SCTLR)
+
+    BitUnion32(CPACR)
+        Bitfield<1, 0> cp0;
+        Bitfield<3, 2> cp1;
+        Bitfield<5, 4> cp2;
+        Bitfield<7, 6> cp3;
+        Bitfield<9, 8> cp4;
+        Bitfield<11, 10> cp5;
+        Bitfield<13, 12> cp6;
+        Bitfield<15, 14> cp7;
+        Bitfield<17, 16> cp8;
+        Bitfield<19, 18> cp9;
+        Bitfield<21, 20> cp10;
+        Bitfield<23, 22> cp11;
+        Bitfield<25, 24> cp12;
+        Bitfield<27, 26> cp13;
+        Bitfield<30> d32dis;
+        Bitfield<31> asedis;
+    EndBitUnion(CPACR)
 };
 
 #endif // __ARCH_ARM_MISCREGS_HH__