Add dual-core configuration

cheshire.mk

@@ -16,6 +16,7 @@ VLOG_ARGS ?= -suppress 2583 -suppress 13314 -timescale 1ns/1ps
 
 # Common Bender flags for Cheshire RTL
 CHS_BENDER_RTL_FLAGS ?= -t rtl -t cva6 -t cv64a6_imafdcsclic_sv39
+NUM_CORES            ?= 1
 
 # Define used paths (prefixed to avoid name conflicts)
 CHS_ROOT      ?= $(shell $(BENDER) path cheshire)
@@ -86,12 +87,15 @@ $(CHS_ROOT)/hw/regs/cheshire_reg_pkg.sv $(CHS_ROOT)/hw/regs/cheshire_reg_top.sv:
 	$(REGTOOL) -r $< --outdir $(dir $@)
 
 # CLINT
-CLINTCORES ?= 1
+CLINTCORES ?= $(NUM_CORES)
 include $(CLINTROOT)/clint.mk
 $(CLINTROOT)/.generated:
 	flock -x $@ $(MAKE) clint && touch $@
 
 # OpenTitan peripherals
+$(CHS_ROOT)/hw/rv_plic.cfg.hjson: $(CHS_ROOT)/util/gen_pliccfg.py
+	$(CHS_ROOT)/util/gen_pliccfg.py --num-cores $(NUM_CORES) > $@
+
 include $(OTPROOT)/otp.mk
 $(OTPROOT)/.generated: $(CHS_ROOT)/hw/rv_plic.cfg.hjson
 	flock -x $@ sh -c "cp $< $(dir $@)/src/rv_plic/; $(MAKE) -j1 otp" && touch $@

hw/rv_plic.cfg.hjson

@@ -3,12 +3,14 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 // Paul Scheffler <[email protected]>
+// Enrico Zelioli <[email protected]>
+// AUTOMATICALLY GENERATED by gen_pliccfg.py; edit the script instead.
 
 {
     instance_name: "rv_plic",
     param_values: {
         src: 58,
-        target: 2,  // We need *two targets* per hart: M and S modes
+        target: 4,  // We need *two targets* per hart: M and S modes
         prio: 7,
         nonstd_regs: 0  // Do *not* include these: MSIPs are not used and we use a 64 MiB address space
     },

target/sim/src/tb_cheshire_pkg.sv

@@ -23,14 +23,22 @@ package tb_cheshire_pkg;
       return ret;
     endfunction
 
+    // A dedicated dual-core config
+    function automatic cheshire_cfg_t gen_cheshire_dualcore_cfg();
+      cheshire_cfg_t ret = DefaultCfg;
+      ret.NumCores = 2;
+      return ret;
+    endfunction
+
     // Number of Cheshire configurations
-    localparam int unsigned NumCheshireConfigs = 32'd3;
+    localparam int unsigned NumCheshireConfigs = 32'd4;
 
     // Assemble a configuration array indexed by a numeric parameter
     localparam cheshire_cfg_t [NumCheshireConfigs-1:0] TbCheshireConfigs = {
-        gen_cheshire_clic_cfg(), // 2: CLIC-enabled configuration
-        gen_cheshire_rt_cfg(),   // 1: RT-enabled configuration
-        DefaultCfg               // 0: Default configuration
+        gen_cheshire_dualcore_cfg(), // 3: Dual-core configuration
+        gen_cheshire_clic_cfg(),     // 2: CLIC-enabled configuration
+        gen_cheshire_rt_cfg(),       // 1: RT-enabled configuration
+        DefaultCfg                   // 0: Default configuration
     };
 
 endpackage

util/gen_pliccfg.py

@@ -0,0 +1,61 @@
+#!/usr/bin/env python3
+#
+# Copyright 2022 ETH Zurich and University of Bologna.
+# Licensed under the Apache License, Version 2.0, see LICENSE for details.
+# SPDX-License-Identifier: Apache-2.0
+#
+# Nicole Narr <[email protected]>
+# Christopher Reinwardt <[email protected]>
+#
+# Fabian Schuiki <[email protected]>
+# Florian Zaruba <[email protected]>
+# Stefan Mach <[email protected]>
+# Thomas Benz <[email protected]>
+# Paul Scheffler <[email protected]>
+# Wolfgang Roenninger <[email protected]>
+# Gianna Paulin <[email protected]>
+# Tim Fischer <[email protected]>
+# Enrico Zelioli <[email protected]>
+
+import os
+import argparse
+
+# Parse arguments.
+parser = argparse.ArgumentParser(description="Generate rv_plic.cfg.hjson")
+parser.add_argument(
+    "--num-cores",
+    "-n",
+    dest="num_cores",
+    default=1,
+    type=int,
+    help=
+    "Number of cores attached to the PLIC. The number of PLIC targets is set accordingly (2 * num-cores)"
+)
+args = parser.parse_args()
+
+num_targets = args.num_cores * 2
+
+# Emit the code.
+print("""
+// Copyright 2022 ETH Zurich and University of Bologna.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+//
+// Paul Scheffler <[email protected]>
+// Enrico Zelioli <[email protected]>
+// AUTOMATICALLY GENERATED by {script}; edit the script instead.
+
+{{
+    instance_name: \"rv_plic\",
+    param_values: {{
+        src: 58,
+        target: {targets},  // We need *two targets* per hart: M and S modes
+        prio: 7,
+        nonstd_regs: 0  // Do *not* include these: MSIPs are not used and we use a 64 MiB address space
+    }},
+}}
+
+""".strip().format(
+    script=os.path.basename(__file__),
+    targets=num_targets
+))