Clean up build process

Makefile

@@ -1,11 +1,27 @@
 BUILD_DIR=./build
+export QEMU?=qemu-system-x86_64
+
+
+.PHONY: bios
+bios: $(BUILD_DIR)/bios.bin $(BUILD_DIR)/bios.img
 
 .PHONY: clean
-
-all: $(BUILD_DIR)/bootloader.bin
-
-include make/bios
-include make/bootloader
-
 clean:
-	rm -drf $(BUILD_DIR)
+	rm -drf $(BUILD_DIR)
+	cd bootloader; cargo clean
+
+qemu: $(BUILD_DIR)/bios.img
+	$(QEMU) \
+		-d cpu_reset \
+		-no-reboot \
+		-smp 4 -m 2048 \
+		-chardev stdio,id=debug,signal=off,mux=on \
+		-serial chardev:debug \
+		-mon chardev=debug \
+		-machine q35 \
+		-net none \
+		-enable-kvm \
+		-cpu host \
+		-drive file="$<",format=raw
+
+include make/bios