From 1a7d3f9fcb76a68540dd948f91413533a383bfde Mon Sep 17 00:00:00 2001
From: Tony Gutierrez <anthony.gutierrez@amd.com>
Date: Tue, 19 Jan 2016 14:28:22 -0500
Subject: gpu-compute: AMD's baseline GPU model

---
 src/gpu-compute/fetch_stage.hh | 78 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/gpu-compute/fetch_stage.hh

(limited to 'src/gpu-compute/fetch_stage.hh')

diff --git a/src/gpu-compute/fetch_stage.hh b/src/gpu-compute/fetch_stage.hh
new file mode 100644
index 000000000..ce7faa8ac
--- /dev/null
+++ b/src/gpu-compute/fetch_stage.hh
@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2014-2015 Advanced Micro Devices, Inc.
+ * All rights reserved.
+ *
+ * For use for simulation and test purposes only
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ *
+ * 2. 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.
+ *
+ * 3. Neither the name of the copyright holder 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 HOLDER 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.
+ *
+ * Author: Anthony Gutierrez, Sooraj Puthoor
+ */
+
+#ifndef __FETCH_STAGE_HH__
+#define __FETCH_STAGE_HH__
+
+#include <string>
+#include <vector>
+
+#include "gpu-compute/fetch_unit.hh"
+
+// Instruction fetch stage.
+// All dispatched wavefronts for all SIMDS are analyzed for the
+// need to fetch instructions. From the fetch eligible waves,
+// one wave is selected from each SIMD and fetch is initiated
+// for the selected waves.
+
+class ComputeUnit;
+class Wavefront;
+
+class FetchStage
+{
+  public:
+    FetchStage(const ComputeUnitParams* params);
+    ~FetchStage();
+    void init(ComputeUnit *cu);
+    void exec();
+    void processFetchReturn(PacketPtr pkt);
+    void fetch(PacketPtr pkt, Wavefront *wave);
+
+    // Stats related variables and methods
+    std::string name() { return _name; }
+    void regStats();
+    Stats::Distribution instFetchInstReturned;
+
+  private:
+    uint32_t numSIMDs;
+    ComputeUnit *computeUnit;
+
+    // List of fetch units. A fetch unit is
+    // instantiated per SIMD
+    std::vector<FetchUnit> fetchUnit;
+    std::string _name;
+};
+
+#endif // __FETCH_STAGE_HH__
-- 
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