4 files changed, 79 insertions, 4 deletions

diff --git a/arch/alpha/alpha_memory.cc b/arch/alpha/alpha_memory.cc
index 1608cc4a4..23815bf01 100644
--- a/arch/alpha/alpha_memory.cc
+++ b/arch/alpha/alpha_memory.cc
@@ -425,8 +425,8 @@ AlphaDTB::fault(Addr vaddr, uint64_t flags, ExecContext *xc) const
         ipr[AlphaISA::IPR_VA] = vaddr;
 
         // set MM_STAT register flags
-        ipr[AlphaISA::IPR_MM_STAT] = (((xc->regs.opcode & 0x3f) << 11)
-                               | ((xc->regs.ra & 0x1f) << 6)
+        ipr[AlphaISA::IPR_MM_STAT] = (((OPCODE(xc->getInst()) & 0x3f) << 11)
+                               | ((RA(xc->getInst()) & 0x1f) << 6)
                                | (flags & 0x3f));
 
         // set VA_FORM register with faulting formatted address
diff --git a/arch/alpha/ev5.cc b/arch/alpha/ev5.cc
index 96d54c54c..e88f6d0a3 100644
--- a/arch/alpha/ev5.cc
+++ b/arch/alpha/ev5.cc
@@ -7,6 +7,7 @@
 #include "base/remote_gdb.hh"
 #include "base/stats/events.hh"
 #include "cpu/exec_context.hh"
+#include "cpu/fast_cpu/fast_cpu.hh"
 #include "sim/debug.hh"
 #include "sim/sim_events.hh"
 
@@ -98,6 +99,64 @@ AlphaISA::initIPRs(RegFile *regs)
 }
 
 
+template <class XC>
+void
+AlphaISA::processInterrupts(XC *xc)
+{
+    //Check if there are any outstanding interrupts
+    //Handle the interrupts
+    int ipl = 0;
+    int summary = 0;
+    IntReg *ipr = xc->getIprPtr();
+
+    check_interrupts = 0;
+
+    if (ipr[IPR_ASTRR])
+        panic("asynchronous traps not implemented\n");
+
+    if (ipr[IPR_SIRR]) {
+        for (int i = INTLEVEL_SOFTWARE_MIN;
+             i < INTLEVEL_SOFTWARE_MAX; i++) {
+            if (ipr[IPR_SIRR] & (ULL(1) << i)) {
+                // See table 4-19 of the 21164 hardware reference
+                ipl = (i - INTLEVEL_SOFTWARE_MIN) + 1;
+                summary |= (ULL(1) << i);
+            }
+        }
+    }
+
+    uint64_t interrupts = xc->intr_status();
+
+    if (interrupts) {
+        for (int i = INTLEVEL_EXTERNAL_MIN;
+             i < INTLEVEL_EXTERNAL_MAX; i++) {
+            if (interrupts & (ULL(1) << i)) {
+                // See table 4-19 of the 21164 hardware reference
+                ipl = i;
+                summary |= (ULL(1) << i);
+            }
+        }
+    }
+
+    if (ipl && ipl > ipr[IPR_IPLR]) {
+        ipr[IPR_ISR] = summary;
+        ipr[IPR_INTID] = ipl;
+        xc->trap(Interrupt_Fault);
+        DPRINTF(Flow, "Interrupt! IPLR=%d ipl=%d summary=%x\n",
+                ipr[IPR_IPLR], ipl, summary);
+    }
+
+}
+
+template <class XC>
+void
+AlphaISA::zeroRegisters(XC *xc)
+{
+    // Insure ISA semantics
+    xc->setIntReg(ZeroReg, 0);
+    xc->setFloatRegDouble(ZeroReg, 0.0);
+}
+
 void
 ExecContext::ev5_trap(Fault fault)
 {
@@ -582,4 +641,12 @@ ExecContext::simPalCheck(int palFunc)
     return true;
 }
 
+//Forward instantiation for FastCPU object
+template
+void AlphaISA::processInterrupts(FastCPU *xc);
+
+//Forward instantiation for FastCPU object
+template
+void AlphaISA::zeroRegisters(FastCPU *xc);
+
 #endif // FULL_SYSTEM
diff --git a/arch/alpha/ev5.hh b/arch/alpha/ev5.hh
index aa3d7e226..6947ef708 100644
--- a/arch/alpha/ev5.hh
+++ b/arch/alpha/ev5.hh
@@ -71,6 +71,8 @@
 #define MM_STAT_ACV_MASK		0x0002
 #define MM_STAT_WR_MASK			0x0001
 
+#define OPCODE(X)                       (X >> 26) & 0x3f
+#define RA(X)                           (X >> 21) & 0x1f
 
 ////////////////////////////////////////////////////////////////////////
 //
diff --git a/arch/alpha/isa_traits.hh b/arch/alpha/isa_traits.hh
index 05ab89978..37ba77192 100644
--- a/arch/alpha/isa_traits.hh
+++ b/arch/alpha/isa_traits.hh
@@ -33,6 +33,7 @@
 #include "targetarch/faults.hh"
 #include "base/misc.hh"
 
+class FastCPU;
 class FullCPU;
 class Checkpoint;
 
@@ -156,8 +157,6 @@ class AlphaISA
         int intrflag;			// interrupt flag
         bool pal_shadow;		// using pal_shadow registers
 #endif // FULL_SYSTEM
-        // Are these architectural, or just for convenience?
-        uint8_t opcode, ra;		// current instruction details (for intr's)
 
         void serialize(std::ostream &os);
         void unserialize(Checkpoint *cp, const std::string &section);
@@ -233,6 +232,13 @@ class AlphaISA
                                        ConfigNode *node,
                                        RegFile &regs);
 #endif
+
+    /**
+     * Function to insure ISA semantics about 0 registers.
+     * @param xc The execution context.
+     */
+    template <class XC>
+    static void zeroRegisters(XC *xc);
 };