From: Gabe Black <gblack@eecs.umich.edu>
Date: Sun, 29 Oct 2006 06:58:37 +0000 (-0500)
Subject: Add an integer microcode register.
X-Git-Tag: m5_2.0_beta2~70^2~13
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6dddca951151c953fdab6f3e57b9385150d8b90b;p=gem5.git

Add an integer microcode register.

--HG--
extra : convert_revision : f23dbfdfe44e8e6cdd6948000669ad4f743b9fb4
---

diff --git a/src/arch/sparc/intregfile.cc b/src/arch/sparc/intregfile.cc
index bef62f6ae..164f194dd 100644
--- a/src/arch/sparc/intregfile.cc
+++ b/src/arch/sparc/intregfile.cc
@@ -75,8 +75,14 @@ IntRegFile::IntRegFile()
 
 IntReg IntRegFile::readReg(int intReg)
 {
-    IntReg val =
-        regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask];
+    IntReg val;
+    if(intReg < NumRegularIntRegs)
+        val = regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask];
+    else if((intReg -= NumRegularIntRegs) < NumMicroIntRegs)
+        val = microRegs[intReg];
+    else
+        panic("Tried to read non-existant integer register\n");
+
     DPRINTF(Sparc, "Read register %d = 0x%x\n", intReg, val);
     return val;
 }
@@ -86,7 +92,12 @@ Fault IntRegFile::setReg(int intReg, const IntReg &val)
     if(intReg)
     {
         DPRINTF(Sparc, "Wrote register %d = 0x%x\n", intReg, val);
-        regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask] = val;
+        if(intReg < NumRegularIntRegs)
+            regView[intReg >> FrameOffsetBits][intReg & FrameOffsetMask] = val;
+        else if((intReg -= NumRegularIntRegs) < NumMicroIntRegs)
+            microRegs[intReg] = val;
+        else
+            panic("Tried to set non-existant integer register\n");
     }
     return NoFault;
 }
@@ -123,6 +134,7 @@ void IntRegFile::serialize(std::ostream &os)
         SERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
     for(x = 0; x < 2 * NWindows; x++)
         SERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
+    SERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 }
 
 void IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
@@ -132,4 +144,5 @@ void IntRegFile::unserialize(Checkpoint *cp, const std::string &section)
         UNSERIALIZE_ARRAY(regGlobals[x], RegsPerFrame);
     for(unsigned int x = 0; x < 2 * NWindows; x++)
         UNSERIALIZE_ARRAY(regSegments[x], RegsPerFrame);
+    UNSERIALIZE_ARRAY(microRegs, NumMicroIntRegs);
 }
diff --git a/src/arch/sparc/intregfile.hh b/src/arch/sparc/intregfile.hh
index d305c753b..223e3b34c 100644
--- a/src/arch/sparc/intregfile.hh
+++ b/src/arch/sparc/intregfile.hh
@@ -65,6 +65,7 @@ namespace SparcISA
 
         IntReg regGlobals[MaxGL][RegsPerFrame];
         IntReg regSegments[2 * NWindows][RegsPerFrame];
+        IntReg microRegs[NumMicroIntRegs];
 
         enum regFrame {Globals, Outputs, Locals, Inputs, NumFrames};
 
diff --git a/src/arch/sparc/isa/operands.isa b/src/arch/sparc/isa/operands.isa
index ba2c38e91..80b499b91 100644
--- a/src/arch/sparc/isa/operands.isa
+++ b/src/arch/sparc/isa/operands.isa
@@ -61,6 +61,7 @@ def operands {{
     'RdHigh':		('IntReg', 'udw', 'RD | 1', 'IsInteger', 3),
     'Rs1': 		('IntReg', 'udw', 'RS1', 'IsInteger', 4),
     'Rs2': 		('IntReg', 'udw', 'RS2', 'IsInteger', 5),
+    'uReg0':		('IntReg', 'udw', 'NumRegularIntRegs+0', 'IsInteger', 6),
     'Frds':		('FloatReg', 'sf', 'RD', 'IsFloating', 10),
     'Frd':		('FloatReg', 'df', 'dfpr(RD)', 'IsFloating', 10),
     # Each Frd_N refers to the Nth double precision register from Frd.
diff --git a/src/arch/sparc/isa_traits.hh b/src/arch/sparc/isa_traits.hh
index fb09121a3..46a0ebbfb 100644
--- a/src/arch/sparc/isa_traits.hh
+++ b/src/arch/sparc/isa_traits.hh
@@ -57,13 +57,17 @@ namespace SparcISA
     //This makes sure the big endian versions of certain functions are used.
     using namespace BigEndianGuest;
 
-    // SPARC have a delay slot
+    // SPARC has a delay slot
     #define ISA_HAS_DELAY_SLOT 1
 
     // SPARC NOP (sethi %(hi(0), g0)
     const MachInst NoopMachInst = 0x01000000;
 
-    const int NumIntRegs = 32;
+    const int NumRegularIntRegs = 32;
+    const int NumMicroIntRegs = 1;
+    const int NumIntRegs =
+        NumRegularIntRegs +
+        NumMicroIntRegs;
     const int NumFloatRegs = 64;
     const int NumMiscRegs = 40;