diff --git a/src/dev/arm/smmu_v3_defs.hh b/src/dev/arm/smmu_v3_defs.hh
index 991e90c..d993fd7 100644
--- a/src/dev/arm/smmu_v3_defs.hh
+++ b/src/dev/arm/smmu_v3_defs.hh
@@ -311,6 +311,15 @@
     uint64_t _pad[3];
 };
 
+enum {
+    CR0_SMMUEN_MASK = 0x1,
+    CR0_PRIQEN_MASK = 0x2,
+    CR0_EVENTQEN_MASK = 0x4,
+    CR0_CMDQEN_MASK = 0x8,
+    CR0_ATSCHK_MASK = 0x10,
+    CR0_VMW_MASK = 0x1C0,
+};
+
 enum SMMUCommandType {
     CMD_PRF_CONFIG   = 0x1000,
     CMD_PRF_ADDR     = 0x1001,
diff --git a/src/dev/arm/smmu_v3_transl.cc b/src/dev/arm/smmu_v3_transl.cc
index c1d998e..d7d5768 100644
--- a/src/dev/arm/smmu_v3_transl.cc
+++ b/src/dev/arm/smmu_v3_transl.cc
@@ -155,8 +155,7 @@
 
     recvTick = curTick();
 
-
-    if (!(smmu.regs.cr0 & 0x1)) {
+    if (!(smmu.regs.cr0 & CR0_SMMUEN_MASK)) {
         // SMMU disabled
         doDelay(yield, Cycles(1));
         completeTransaction(yield, bypass(request.addr));