first commit

2023-08-21 10:09:02 -04:00
commit e2567d25ba
5 changed files with 196 additions and 0 deletions
@@ -0,0 +1,50 @@
+ASM=nasm
+
+SRC_DIR=src
+BUILD_DIR=build
+
+.PHONY: all floppy_image kernel bootloader clean always
+
+#
+# Floppy image
+#  * use dd to create 1.44MB blank image file
+#  * apply FAT12 filesystem to image
+#  * copy 512 byte bootloader binary to image using dd (overwriting first sector)
+#  * copy kernel binary to filesystem
+#    + this step wtill fail if bootloader binary does not contain proper FAT12 headers
+#
+floppy_image: $(BUILD_DIR)/main_floppy.img
+
+$(BUILD_DIR)/main_floppy.img: bootloader kernel
+	dd if=/dev/zero of=$(BUILD_DIR)/main_floppy.img bs=512 count=2880
+	mkfs.fat -F 12 -n "WEESLOS" $(BUILD_DIR)/main_floppy.img
+	dd if=$(BUILD_DIR)/bootloader.bin of=$(BUILD_DIR)/main_floppy.img conv=notrunc
+	mcopy -i $(BUILD_DIR)/main_floppy.img $(BUILD_DIR)/kernel.bin "::kernel.bin"
+
+#
+# Bootloader
+#
+bootloader: $(BUILD_DIR)/bootloader.bin
+
+$(BUILD_DIR)/bootloader.bin: always
+	$(ASM) $(SRC_DIR)/bootloader/boot.asm -f bin -o $(BUILD_DIR)/bootloader.bin
+
+#
+# Kernel
+#
+kernel: $(BUILD_DIR)/kernel.bin
+
+$(BUILD_DIR)/kernel.bin: always
+	$(ASM) $(SRC_DIR)/kernel/main.asm -f bin -o $(BUILD_DIR)/kernel.bin
+
+#
+# Always
+#
+always:
+	mkdir -p $(BUILD_DIR)
+
+#
+# Clean
+#
+clean:
+	rm -rf $(BUILD_DIR)/*