#####################################################################
# Author: Josh Holtrop / Benjamen R. Meyer                          #
# Date: 02/15/04    Modified: 06/07/04                              #
# Purpose: To build Josh Holtrop's OS (HOS) using GNU make          #
# Note: This makefile is for use on Linux & other Unix-like systems #
#####################################################################

##############
# Variables: #
##############

# Information for creating a floppy image
# Note: FLOPPY_FS and FLOPPY_FAT_SIZE are related fields.
#       FLOPPY_FAT_SIZE should be either 12 or 16,
#       depending on if FLOPPY_FS is FAT12 or FAT16, respectively.
MKDOSFS_PROG=mkdosfs
FLOPPY_IMAGE=floppy.img
FLOPPY_BLOCK_COUNT=1440
FLOPPY_FS=FAT12
FLOPPY_FAT_SIZE=12
FLOPPY_MOUNT=./floppy_image

# Floppy images are good for programs like VMware and Bochs Pentium Emulator. ;-)

# Program for copying
COPY_BIN=cp

##########################################
# Build the IPL (Boot Loader) and Kernel #
##########################################
all:
	# A word of warning to users :-> And a little helpful information ;-)
	@echo "Installation must be done as root."
	@echo "Type 'make install' to install to a floppy in drive '/dev/fd0'"
	@echo "Type 'make install_img' to create a floppy image and install to it."

	make -C boot
	make -C kernel

#################################################
# Clean up the source directory of any binaries #
#################################################
clean:
	make -C boot clean
	make -C kernel clean



###########################################
# The following is for the floppy drive   #
# Note: This must be done on *nix as root #
###########################################

##########################
# Make install to floppy #
##########################
install: Install_IPL File_Copy

############################################
# Write the Stage 1 IPL to the boot sector #
############################################
Install_IPL:
	$(MKDOSFS_PROG) /dev/fd0
	dd if=boot/stage1.bin of=/dev/fd0

#################################
# Copy the files onto the drive #
#################################
File_Copy:
	- mkdir floppy_mount
	@echo "Mounting floppy to ./floppy_mount..."
	mount /dev/fd0 ./floppy_mount

	@echo "Copying stage 2 bootloader to the floppy..."
	$(COPY_BIN) boot/stage2.bin ./floppy_mount

	@echo "Copying kernel to the floppy..."
	$(COPY_BIN) kernel/kernel.bin ./floppy_mount

	@echo "Unmounting floppy..."
	umount ./floppy_mount
	- rm -rf floppy_mount


############################################
# The following is for the floppy image.   #
# Note: This must be done on *nix as root. #
############################################

######################################
# Create and Format the floppy image #
######################################
install_img:
	$(MKDOSFS_PROG) -C -F $(FLOPPY_FAT_SIZE) -r 112 $(FLOPPY_IMAGE) $(FLOPPY_BLOCK_COUNT)

############################################
# Write the Stage 1 IPL to the boot sector #
############################################
	@echo "Writing boot sector to image..."
	dd if=boot/stage1.bin of=$(FLOPPY_IMAGE) seek=0

#################################
# Copy the files onto the image #
#################################
	- mkdir $(FLOPPY_MOUNT)
	@echo "Mounting floppy image..."
	mount $(FLOPPY_IMAGE) $(FLOPPY_MOUNT) -o loop

	@echo "Copying stage 2 bootloader to the floppy image..."
	$(COPY_BIN) boot/stage2.bin $(FLOPPY_MOUNT)
	@echo "Copying kernel to the floppy image..."
	$(COPY_BIN) kernel/kernel.bin $(FLOPPY_MOUNT)

	@echo "Unmounting floppy image..."
	mount $(FLOPPY_IMAGE) $(FLOPPY_MOUNT) -o loop