Restructure repo and rework Makefiles with proper dependency tracking

sims/nic/corundum/rules.mk

+include mk/subdir_pre.mk
+
+
+dir_corundum := $(d)
+bin_corundum := $(d)corundum_verilator
+verilator_dir_corundum := $(d)obj_dir
+verilator_src_corundum := $(verilator_dir_corundum)/Vinterface.cpp
+verilator_bin_corundum := $(verilator_dir_corundum)/Vinterface
+
+vsrcs_corundum := $(wildcard $(d)rtl/*.v $(d)lib/*/rtl/*.v \
+    $(d)lib/*/lib/*/rtl/*.v)
+srcs_corundum := $(addprefix $(d),corundum_verilator.cpp dma.cpp mem.cpp)
+OBJS := $(srcs_corundum:.cpp=.o)
+
+$(OBJS): CPPFLAGS := $(CPPFLAGS) -I$(d)include/ -I$(lib_proto_inc) \
+    -I$(lib_nicbm_inc) -I$(lib_nicsim_inc)
+
+$(verilator_src_corundum): $(vsrcs_corundum)
+	$(VERILATOR) $(VFLAGS) --cc -O3 \
+	    -CFLAGS "-I$(abspath $(lib_nicsim_inc)) -I$(abspath $(lib_proto_inc)) -O3 -g -Wall" \
+	    --Mdir $(verilator_dir_corundum) \
+	    -y $(dir_corundum)rtl \
+	    -y $(dir_corundum)lib/axi/rtl \
+	    -y $(dir_corundum)lib/eth/lib/axis/rtl/ \
+	    -y $(dir_corundum)lib/pcie/rtl \
+	    $(dir_corundum)rtl/interface.v --exe $(abspath $(srcs_corundum)) $(abspath $(lib_nicsim))
+
+$(verilator_bin_corundum): $(verilator_src_corundum) $(srcs_corundum) \
+    $(lib_nicsim)
+	$(MAKE) -C $(verilator_dir_corundum) -f Vinterface.mk
+
+$(bin_corundum): $(verilator_bin_corundum)
+	cp $< $@
+
+CLEAN := $(bin_corundum) $(verilator_dir_corundum) $(OBJS)
+ALL := $(bin_corundum)
+include mk/subdir_post.mk

sims/nic/corundum_bm/rules.mk

+include mk/subdir_pre.mk
+
+bin_corundum_bm := $(d)corundum_bm
+bin_corundum_bm_tester := $(d)tester
+
+objs_corundum_bm := $(d)corundum_bm.o
+objs_corundum_bm_tester := $(d)tester.o
+OBJS := $(objs_corundum_bm) $(objs_corundum_bm_tester)
+
+$(OBJS): CPPFLAGS := $(CPPFLAGS) -I$(d)include/ -I$(lib_proto_inc) \
+    -I$(lib_nicbm_inc) -I$(lib_nicsim_inc)
+
+$(bin_corundum_bm): $(objs_corundum_bm) $(lib_nicbm) $(lib_nicsim)
+$(bin_corundum_bm_tester): $(objs_corundum_bm_tester) $(lib_nicbm) $(lib_nicsim)
+
+CLEAN := $(bin_corundum_bm) $(bin_corundum_bm_tester) $(OBJS)
+ALL := $(bin_corundum_bm)
+include mk/subdir_post.mk