Adding makefile.

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+#===================================================================
+#
+# Makefile
+# --------
+# Makefile for building the TRNG modules and and top simulations.
+#
+#
+# Author: Joachim Strombergson
+# Copyright (c) 2014, NORDUnet A/S 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 NORDUnet 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.
+#
+#===================================================================
+
+CHACHA_SRC=../../chacha/src/rtl/chacha_core.v ../../chacha/src/rtl/chacha_qr.v
+CSPRNG_SRC=../src/rtl/trng_csprng.v ../src/rtl/trng_csprng_fifo.v
+TB_CSPRNG_SRC=../src/tb/tb_csprng.v
+
+CC=iverilog
+
+
+all: csprng.sim
+
+
+csprng.sim: $(TB_CSPRNG_SRC) $(CSPRNG_SRC) $(CHACHA_SRC)
+	$(CC) -o csprng.sim $(TB_CSPRNG_SRC) $(CSPRNG_SRC) $(CHACHA_SRC)
+
+
+sim-csprng: csprng.sim
+	./csprng.sim
+
+
+clean:
+	rm -f csprng.sim
+
+
+help:
+	@echo "Build system for simulation of TRNG core"
+	@echo ""
+	@echo "Supported targets:"
+	@echo "------------------"
+	@echo "all:         Build all simulation targets."
+	@echo "csprng.sim:  Build the csprng simulation target."
+	@echo "sim-csprng:  Run cprng simulation."
+	@echo "clean:       Delete all built files."
+
+#===================================================================
+# EOF Makefile
+#===================================================================