more shit

makefile

@@ -1,12 +1,20 @@
 VERILATOR ?= verilator
 
+CC        ?= clang
+
 VERILOG_SOURCES = \
 	board/system.sv \
 	board/parts/hart.sv \
 	board/parts/pmmu.sv \
 	board/parts/rom.sv 
 
+KERNEL_SOURCES = \
+	os/kernel/boot.s
+
 build/cpu: ${VERILOG_SOURCES} 
 	mkdir -p build/verilog
 	${VERILATOR} --build --binary board/system.sv -Mdir build/verilog +incdir+board
-	cp -f build/verilog/Vsystem build/cpu
+	cp -f build/verilog/Vsystem build/cpu
+
+build/kernel: ${KERNEL_SOURCES}
+	clang ${KERNEL_SOURCES} -o build/kernel