From c1046488e073b2535c76c473aec34fe499c149e3 Mon Sep 17 00:00:00 2001
From: Kevin Lim <ktlim@umich.edu>
Date: Tue, 28 Mar 2006 18:01:01 -0500
Subject: Move TLB faults into the normal Fault code.  The TLB no longer fills
 in IPRs through its own fault() method; this is handled by the fault's
 invoke() methods.

arch/alpha/faults.cc:
    Move TLB fault code into the normal fault invoke() method.
arch/alpha/faults.hh:
    Move DTB/ITB fault handling code into their own class with a specific invoke() method.  Have DTB/ITB faults derive from these classes.

    Unfortunately the DtbAlignmentFault is somewhat odd; it's a normal alignment fault, but it must also set some specific IPRs.
arch/alpha/tlb.cc:
arch/alpha/tlb.hh:
    Setting IPRs is now handled through the fault itself.

--HG--
extra : convert_revision : 5cb92ce2186ff79f632bfcbc9ba62a8a04400eae
---
 arch/alpha/faults.cc | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'arch/alpha/faults.cc')

diff --git a/arch/alpha/faults.cc b/arch/alpha/faults.cc
index e0918da21..0083aa9f3 100644
--- a/arch/alpha/faults.cc
+++ b/arch/alpha/faults.cc
@@ -30,6 +30,9 @@
 #include "cpu/exec_context.hh"
 #include "cpu/base.hh"
 #include "base/trace.hh"
+#if FULL_SYSTEM
+#include "arch/alpha/ev5.hh"
+#endif
 
 namespace AlphaISA
 {
@@ -70,6 +73,10 @@ FaultName DtbAcvFault::_name = "dfault";
 FaultVect DtbAcvFault::_vect = 0x0381;
 FaultStat DtbAcvFault::_count;
 
+FaultName DtbAlignmentFault::_name = "unalign";
+FaultVect DtbAlignmentFault::_vect = 0x0301;
+FaultStat DtbAlignmentFault::_count;
+
 FaultName ItbMissFault::_name = "itbmiss";
 FaultVect ItbMissFault::_vect = 0x0181;
 FaultStat ItbMissFault::_count;
@@ -125,6 +132,44 @@ void ArithmeticFault::invoke(ExecContext * xc)
     panic("Arithmetic traps are unimplemented!");
 }
 
+void DtbFault::invoke(ExecContext * xc)
+{
+    // Set fault address and flags.  Even though we're modeling an
+    // EV5, we use the EV6 technique of not latching fault registers
+    // on VPTE loads (instead of locking the registers until IPR_VA is
+    // read, like the EV5).  The EV6 approach is cleaner and seems to
+    // work with EV5 PAL code, but not the other way around.
+    if (!xc->misspeculating()
+        && !(reqFlags & VPTE) && !(reqFlags & NO_FAULT)) {
+        // set VA register with faulting address
+        xc->setMiscReg(AlphaISA::IPR_VA, vaddr);
+
+        // set MM_STAT register flags
+        xc->setMiscReg(AlphaISA::IPR_MM_STAT,
+            (((EV5::Opcode(xc->getInst()) & 0x3f) << 11)
+             | ((EV5::Ra(xc->getInst()) & 0x1f) << 6)
+             | (flags & 0x3f)));
+
+        // set VA_FORM register with faulting formatted address
+        xc->setMiscReg(AlphaISA::IPR_VA_FORM,
+            xc->readMiscReg(AlphaISA::IPR_MVPTBR) | (vaddr.vpn() << 3));
+    }
+
+    AlphaFault::invoke(xc);
+}
+
+void ItbFault::invoke(ExecContext * xc)
+{
+    if (!xc->misspeculating()) {
+        xc->setMiscReg(AlphaISA::IPR_ITB_TAG, pc);
+        xc->setMiscReg(AlphaISA::IPR_IFAULT_VA_FORM,
+                       xc->readMiscReg(AlphaISA::IPR_IVPTBR) |
+                       (AlphaISA::VAddr(pc).vpn() << 3));
+    }
+
+    AlphaFault::invoke(xc);
+}
+
 #endif
 
 } // namespace AlphaISA
-- 
cgit v1.2.3