Add a simple Makefile to wrap running dvsim for icache tests

This patch also includes a hacky test timeout. We'll remove this (or
at least make it bigger) when we start actually running data through
the tests, but this is handy for now because it means simulations
finish without having to pkill them.

dv/uvm/icache/dv/Makefile

@@ -0,0 +1,40 @@
+# Copyright lowRISC contributors.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+
+# Simple wrappers around dvsim.py to avoid needing long command lines. This
+# doesn't do any dependency tracking (as you might expect in a Makefile) because
+# the dvsim infrastructure doesn't support it.
+
+# Set WAVES to 1 to get VPD/FSDB dumps
+WAVES=0
+
+# Set VERBOSITY to a nonempty string and it will be passed to dvsim with the
+# --verbosity parameter, overriding whatever was set in the hjson file.
+VERBOSITY=
+
+# Specify the seed for the test to run. If this is empty, dvsim.py will pick
+# random seeds. By default, we make runs reproducible, so force the seed.
+SEED=1
+
+ibex-top       := ../../../..
+dvsim-py       := $(ibex-top)/vendor/lowrisc_ip/dvsim/dvsim.py
+dvsim-std-args := --skip-ral --scratch-root $(ibex-top)/build -v h
+
+waves-arg      := $(if $(filter-out 0,$(WAVES)),--waves,)
+verbosity-arg  := $(if $(VERBOSITY),--verbosity $(VERBOSITY),)
+seed-arg       := $(if $(SEED),--fixed-seed $(SEED),)
+
+dvsim-mk-args := $(waves-arg) $(verbosity-arg) $(seed-arg)
+run-dvsim     := $(dvsim-py) $(dvsim-std-args) $(dvsim-mk-args)
+
+.PHONY: all
+all: run
+
+.PHONY: just-build
+just-build:
+	$(run-dvsim) --build-only ibex_icache_sim_cfg.hjson
+
+.PHONY: run
+run:
+	$(run-dvsim) ibex_icache_sim_cfg.hjson

dv/uvm/icache/dv/ibex_icache_sim_cfg.hjson

@@ -42,6 +42,7 @@
     {
       name: ibex_icache_sanity
       uvm_test_seq: ibex_icache_sanity_vseq
+      run_opts: ["+test_timeout_ns=10000"]
     }
 
     // TODO: add more tests here