diff --git a/src/arch/arm/fastmodel/CortexA76/thread_context.cc b/src/arch/arm/fastmodel/CortexA76/thread_context.cc
index 1259bf1..238beec 100644
--- a/src/arch/arm/fastmodel/CortexA76/thread_context.cc
+++ b/src/arch/arm/fastmodel/CortexA76/thread_context.cc
@@ -47,11 +47,11 @@
 {
     // Determine what memory spaces are currently active.
     Iris::CanonicalMsn in_msn;
-    switch (currEL(this)) {
-      case EL3:
+    switch (ArmISA::currEL(this)) {
+      case ArmISA::EL3:
         in_msn = Iris::SecureMonitorMsn;
         break;
-      case EL2:
+      case ArmISA::EL2:
         in_msn = Iris::NsHypMsn;
         break;
       default:
@@ -59,7 +59,7 @@
         break;
     }
 
-    Iris::CanonicalMsn out_msn = isSecure(this) ?
+    Iris::CanonicalMsn out_msn = ArmISA::isSecure(this) ?
         Iris::PhysicalMemorySecureMsn : Iris::PhysicalMemoryNonSecureMsn;
 
     // Figure out what memory spaces match the canonical numbers we need.
@@ -108,7 +108,7 @@
     if (idx == ArmISA::INTREG_R13_MON || idx == ArmISA::INTREG_R14_MON) {
         orig_cpsr = readMiscRegNoEffect(ArmISA::MISCREG_CPSR);
         ArmISA::CPSR new_cpsr = orig_cpsr;
-        new_cpsr.mode = MODE_MON;
+        new_cpsr.mode = ArmISA::MODE_MON;
         non_const_this->setMiscReg(ArmISA::MISCREG_CPSR, new_cpsr);
     }
 
@@ -129,7 +129,7 @@
     if (idx == ArmISA::INTREG_R13_MON || idx == ArmISA::INTREG_R14_MON) {
         orig_cpsr = readMiscRegNoEffect(ArmISA::MISCREG_CPSR);
         ArmISA::CPSR new_cpsr = orig_cpsr;
-        new_cpsr.mode = MODE_MON;
+        new_cpsr.mode = ArmISA::MODE_MON;
         setMiscReg(ArmISA::MISCREG_CPSR, new_cpsr);
     }
 
@@ -146,7 +146,7 @@
     RegVal result = Iris::ThreadContext::readCCRegFlat(idx);
     switch (idx) {
       case ArmISA::CCREG_NZ:
-        result = ((CPSR)result).nz;
+        result = ((ArmISA::CPSR)result).nz;
         break;
       case ArmISA::CCREG_FP:
         result = bits(result, 31, 28);
@@ -163,14 +163,14 @@
     switch (idx) {
       case ArmISA::CCREG_NZ:
         {
-            CPSR cpsr = readMiscRegNoEffect(ArmISA::MISCREG_CPSR);
+            ArmISA::CPSR cpsr = readMiscRegNoEffect(ArmISA::MISCREG_CPSR);
             cpsr.nz = val;
             val = cpsr;
         }
         break;
       case ArmISA::CCREG_FP:
         {
-            FPSCR fpscr = readMiscRegNoEffect(ArmISA::MISCREG_FPSCR);
+            ArmISA::FPSCR fpscr = readMiscRegNoEffect(ArmISA::MISCREG_FPSCR);
             val = insertBits(fpscr, 31, 28, val);
         }
         break;
@@ -921,10 +921,10 @@
         { ArmISA::INTREG_R13_FIQ, "X29" },
         { ArmISA::INTREG_R14_FIQ, "X30" },
         // Skip zero, ureg0-2, and dummy regs.
-        { INTREG_SP0, "SP_EL0" },
-        { INTREG_SP1, "SP_EL1" },
-        { INTREG_SP2, "SP_EL2" },
-        { INTREG_SP3, "SP_EL3" },
+        { ArmISA::INTREG_SP0, "SP_EL0" },
+        { ArmISA::INTREG_SP1, "SP_EL1" },
+        { ArmISA::INTREG_SP2, "SP_EL2" },
+        { ArmISA::INTREG_SP3, "SP_EL3" },
 });
 
 Iris::ThreadContext::IdxNameMap CortexA76TC::ccRegIdxNameMap({
diff --git a/src/arch/arm/fastmodel/iris/interrupts.cc b/src/arch/arm/fastmodel/iris/interrupts.cc
index 8c1f5b2..1976089 100644
--- a/src/arch/arm/fastmodel/iris/interrupts.cc
+++ b/src/arch/arm/fastmodel/iris/interrupts.cc
@@ -28,7 +28,7 @@
 #include "arch/arm/fastmodel/iris/interrupts.hh"
 
 #include "arch/arm/fastmodel/iris/thread_context.hh"
-#include "arch/arm/isa_traits.hh"
+#include "arch/arm/interrupts.hh"
 #include "arch/arm/miscregs.hh"
 #include "arch/arm/miscregs_types.hh"
 #include "arch/arm/types.hh"
@@ -86,12 +86,12 @@
     for (bool &i: interrupts)
         i = false;
 
-    interrupts[INT_ABT] = phys_abort;
-    interrupts[INT_IRQ] = phys_irq;
-    interrupts[INT_FIQ] = phys_fiq;
-    interrupts[INT_SEV] = tc->readMiscReg(MISCREG_SEV_MAILBOX);
-    interrupts[INT_VIRT_IRQ] = virt_irq;
-    interrupts[INT_VIRT_FIQ] = virt_fiq;
+    interrupts[ArmISA::INT_ABT] = phys_abort;
+    interrupts[ArmISA::INT_IRQ] = phys_irq;
+    interrupts[ArmISA::INT_FIQ] = phys_fiq;
+    interrupts[ArmISA::INT_SEV] = tc->readMiscReg(MISCREG_SEV_MAILBOX);
+    interrupts[ArmISA::INT_VIRT_IRQ] = virt_irq;
+    interrupts[ArmISA::INT_VIRT_FIQ] = virt_fiq;
 
     for (int i = 0; i < NumInterruptTypes; i++) {
         if (interrupts[i])
diff --git a/src/arch/arm/fastmodel/iris/thread_context.hh b/src/arch/arm/fastmodel/iris/thread_context.hh
index a37fbc6..2a64b5b 100644
--- a/src/arch/arm/fastmodel/iris/thread_context.hh
+++ b/src/arch/arm/fastmodel/iris/thread_context.hh
@@ -445,12 +445,6 @@
         panic("%s not implemented.", __FUNCTION__);
     }
 
-    void
-    syscall() override
-    {
-        panic("%s not implemented.", __FUNCTION__);
-    }
-
     /** @{ */
     /**
      * Flat register interfaces
@@ -517,6 +511,24 @@
     void setCCRegFlat(RegIndex idx, RegVal val) override;
     /** @} */
 
+    // hardware transactional memory
+    void
+    htmAbortTransaction(uint64_t htm_uid, HtmFailureFaultCause cause) override
+    {
+        panic("%s not implemented.", __FUNCTION__);
+    }
+
+    BaseHTMCheckpointPtr &
+    getHtmCheckpointPtr() override
+    {
+        panic("%s not implemented.", __FUNCTION__);
+    }
+
+    void
+    setHtmCheckpointPtr(BaseHTMCheckpointPtr cpt) override
+    {
+        panic("%s not implemented.", __FUNCTION__);
+    }
 };
 
 } // namespace Iris
diff --git a/src/dev/arm/VExpressFastmodel.py b/src/dev/arm/VExpressFastmodel.py
index 8cf8994..43f25ef 100644
--- a/src/dev/arm/VExpressFastmodel.py
+++ b/src/dev/arm/VExpressFastmodel.py
@@ -24,6 +24,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 from m5.objects.FastModelGIC import FastModelGIC, SCFastModelGIC
+from m5.objects.Gic import ArmInterruptPin
 from m5.objects.RealView import VExpress_GEM5_Base, HDLcd
 
 class VExpressFastmodel(VExpress_GEM5_Base):
@@ -35,7 +36,8 @@
         ))
 
     hdlcd = HDLcd(
-        pxl_clk=VExpress_GEM5_Base.dcc.osc_pxl, pio_addr=0x2b000000, int_num=95)
+        pxl_clk=VExpress_GEM5_Base.dcc.osc_pxl, pio_addr=0x2b000000,
+        interrupt=ArmInterruptPin(num=95))
 
     def __init__(self, *args, **kwargs):
         super(VExpressFastmodel, self).__init__(*args, **kwargs)