From 973d8b8b13b8e4ea178cafa95aaf6538699b8b15 Mon Sep 17 00:00:00 2001
From: Korey Sewell <ksewell@umich.edu>
Date: Tue, 10 Feb 2009 15:49:29 -0800
Subject: InOrder: Import new inorder CPU model from MIPS. This model currently
 only works in MIPS_SE mode, so it will take some effort to clean it up and
 make it generally useful. Hopefully people are willing to help make that
 happen!

---
 src/cpu/inorder/resources/decode_unit.cc | 92 ++++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 src/cpu/inorder/resources/decode_unit.cc

(limited to 'src/cpu/inorder/resources/decode_unit.cc')

diff --git a/src/cpu/inorder/resources/decode_unit.cc b/src/cpu/inorder/resources/decode_unit.cc
new file mode 100644
index 000000000..1628c32d0
--- /dev/null
+++ b/src/cpu/inorder/resources/decode_unit.cc
@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2007 MIPS Technologies, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met: redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer;
+ * redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution;
+ * neither the name of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors: Korey Sewell
+ *
+ */
+
+#include "cpu/inorder/resources/decode_unit.hh"
+
+using namespace TheISA;
+using namespace ThePipeline;
+using namespace std;
+
+DecodeUnit::DecodeUnit(std::string res_name, int res_id, int res_width,
+                       int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params)
+    : Resource(res_name, res_id, res_width, res_latency, _cpu)
+{
+    for (int tid = 0; tid < MaxThreads; tid++) {
+        regDepMap[tid] = &cpu->archRegDepMap[tid];
+    }
+}
+
+void
+DecodeUnit::execute(int slot_num)
+{
+    ResourceRequest* decode_req = reqMap[slot_num];
+    DynInstPtr inst = reqMap[slot_num]->inst;
+    Fault fault = reqMap[slot_num]->fault;
+    int tid, seq_num;
+
+    tid = inst->readTid();
+    seq_num = inst->seqNum;
+    decode_req->fault = NoFault;
+
+    switch (decode_req->cmd)
+    {
+      case DecodeInst:
+        {
+            bool done_sked = ThePipeline::createBackEndSchedule(inst);
+
+            if (done_sked) {
+                DPRINTF(Resource, "[tid:%i]: Setting Destination Register(s) for [sn:%i].\n",
+                    tid, seq_num);
+                regDepMap[tid]->insert(inst);
+                decode_req->done();
+            } else {
+                DPRINTF(Resource,"[tid:%i] Static Inst not available to decode. Unable to create "
+                        "schedule for instruction [sn:%i] \n", tid, inst->seqNum);
+                DPRINTF(InOrderStall, "STALL: \n");
+                decode_req->done(false);
+            }
+        }
+        break;
+
+      default:
+        fatal("Unrecognized command to %s", resName);
+    }
+}
+
+
+void
+DecodeUnit::squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num, unsigned tid)
+{
+    DPRINTF(Resource, "[tid:%i]: Updating due to squash from stage %i after [sn:%i].\n",
+            tid, stage_num, squash_seq_num);
+
+    //cpu->removeInstsUntil(squash_seq_num, tid);
+}
-- 
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