From ce18d900a17cdda2cc041b51c56e6c84fb155331 Mon Sep 17 00:00:00 2001
From: Gabe Black <gblack@eecs.umich.edu>
Date: Tue, 13 Mar 2007 16:13:21 +0000
Subject: Replaced makeExtMI with predecode. Removed the getOpcode function
 from StaticInst which only made sense for Alpha. Started implementing the x86
 predecoder.

--HG--
extra : convert_revision : a13ea257c8943ef25e9bc573024a99abacf4a70d
---
 src/arch/x86/types.hh   | 17 +++++++++++++----
 src/arch/x86/utility.hh | 13 ++++++++++---
 2 files changed, 23 insertions(+), 7 deletions(-)

(limited to 'src/arch/x86')

diff --git a/src/arch/x86/types.hh b/src/arch/x86/types.hh
index 63f65eee5..3f3c1ca0e 100644
--- a/src/arch/x86/types.hh
+++ b/src/arch/x86/types.hh
@@ -62,10 +62,19 @@
 
 namespace X86ISA
 {
-    //XXX This won't work
-    typedef uint32_t MachInst;
-    //XXX This won't work either
-    typedef uint64_t ExtMachInst;
+    //This really determines how many bytes are passed to the predecoder.
+    typedef uint64_t MachInst;
+    //The intermediate structure the x86 predecoder returns.
+    struct ExtMachInst
+    {
+        //Empty for now...
+    };
+
+    bool operator == (const ExtMachInst &emi1, const ExtMachInst &emi2)
+    {
+        //Since this is empty, it's always equal
+        return true;
+    }
 
     typedef uint64_t IntReg;
     //XXX Should this be a 128 bit structure for XMM memory ops?
diff --git a/src/arch/x86/utility.hh b/src/arch/x86/utility.hh
index 1d9d8d3d5..0baa249c3 100644
--- a/src/arch/x86/utility.hh
+++ b/src/arch/x86/utility.hh
@@ -72,9 +72,16 @@ namespace X86ISA
         return false;
     }
 
-    inline ExtMachInst
-    makeExtMI(MachInst inst, ThreadContext * xc) {
-        return inst;
+    PredecodeResult {
+        MoreBytes = 1,
+        ExtMIReady = 2
+    };
+
+    unsigned int
+    predecode(ExtMachInst &extMachInst, Addr currPC, MachInst machInst,
+            ThreadContext * xc) {
+        //Do something to fill up extMachInst...
+        return MoreBytes | ExtMIReady;
     }
 
     inline bool isCallerSaveIntegerRegister(unsigned int reg) {
-- 
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