Added mock rootfs

Makefile

@@ -24,4 +24,5 @@ qemu: $(BUILD_DIR)/bios.img
 		-cpu host \
 		-drive file="$<",format=raw
 
+include make/filesystem
 include make/bios

make/bios

@@ -46,11 +46,12 @@ $(BUILD_DIR)/bios.bin: $(wildcard $(BIOS_SRC)/*.asm) $(BUILD_DIR)/bios.elf
 		"$(BIOS_SRC)/main.asm"
 
 # Build demo disk image
-$(BUILD_DIR)/bios.img: $(BUILD_DIR)/bios.bin
+$(BUILD_DIR)/bios.img: $(BUILD_DIR)/bios.bin $(BUILD_DIR)/filesystem.img
 	rm -f "$@.partial"
 	fallocate -l 256MiB "$@.partial"
 	parted -s -a minimal "$@.partial" mklabel msdos
 	parted -s -a minimal "$@.partial" mkpart primary 2MiB 100%
 	dd if="$<" of="$@.partial" bs=1 count=512 conv=notrunc
 	dd if="$<" of="$@.partial" bs=512 skip=1 seek=1 conv=notrunc
+	dd if="$(BUILD_DIR)/filesystem.img" of="$@.partial" bs=1MiB seek=2 conv=notrunc
 	mv "$@.partial" "$@"

make/filesystem

@@ -0,0 +1,13 @@
+$(BUILD_DIR)/filesystem:
+	@mkdir -p $(BUILD_DIR)
+	rm -f $@.partial
+	mkdir $@.partial
+	fallocate -l 1MiB $@.partial/kernel
+	mv $@.partial $@
+
+$(BUILD_DIR)/filesystem.img: $(BUILD_DIR)/filesystem
+	@mkdir -p $(BUILD_DIR)
+	rm -f $@.partial
+	fallocate -l 254MiB $@.partial
+	redoxfs-ar $@.partial $<
+	mv $@.partial $@