CC := gcc
DEFINES = -DOS_ABAOS
OPT := -O0
INCLUDES = -I. -Ilibc -Ihardware -Idrivers -Idrivers/hdi -Idrivers/hdi/ps2 -Idrivers/video -Inet -Idrivers/net -Ikernel -Igui
CFLAGS := -std=c99 -m32 -march=i486 -ffreestanding $(OPT) -g -Werror $(INCLUDES) $(DEFINES)
LD := ld
LDFLAGS := -m elf_i386
NASMFLAGS := -f elf32
NASM := nasm
OBJCOPY := objcopy
MAGIC := $(shell printf '%x' `date +%s`)
TRUNCATE := truncate
QEMU := qemu-system-i386

all: image.bin kernel.sym

# truncate to correct number of sectors, we have
# 512 (boot, stage 1) + N * 512 (N currenty is 5, stage 2) for boot.bin
# + M * 512 (M is currently 169) for kernel.bin
# (M + N + 1 is the number of sectors to be read in stage 2, as stage 1
# loads only the first sector, and stage 1 loads 5 sectors of stage 2,
# adapt NOF_LOAD_SECTORS to 169)
# then we make sure the image has the size of a 1.44 MB floppy
# (emulators like qemu do some guess work for CHS resolution based
# on the size of the image)
image.bin: boot.bin kernel.bin magic.bin
	cat boot.bin kernel.bin > image.tmp
	$(TRUNCATE) -s 89088 image.tmp
	cat image.tmp magic.bin > image.bin
	$(TRUNCATE) -s 1474560 image.bin
	
boot.bin: boot/boot.asm boot/boot_gdt.asm boot/stage1_functions.asm boot/stage2_real_functions.asm boot/stage2_pm_functions.asm boot/stage2_switch_mode.asm boot/stage2_a20.asm
	$(NASM) boot/boot.asm -DMAGIC='"$(MAGIC)"' -f bin -o boot.bin

kernel.bin: kernel.elf
	$(OBJCOPY) -O binary kernel.elf kernel.bin

kernel.sym: kernel.elf
	$(OBJCOPY) --only-keep-debug kernel.elf kernel.sym

kernel.elf: kernel/entry.o kernel/kernel.o kernel/kernel_asm.o kernel/console.o kernel/vgatext.o kernel/serial.o kernel/memorymanagement.o kernel/tasks.o hardware/port.o hardware/port_asm.o hardware/interrupts.o hardware/interrupts_asm.o hardware/pci.o drivers/driver.o drivers/hdi/mouse.o drivers/hdi/keyboard.o drivers/hdi/ps2/ps2keyboard.o drivers/hdi/ps2/ps2mouse.o drivers/video/video.o drivers/video/vga.o drivers/video/vga_font.o net/ethernet.o net/arp.o net/ipv4.o drivers/net/network.o drivers/net/rtl8139.o gui/widget.o gui/composite_widget.o gui/window.o gui/desktop.o gui/text_widget.o libc/string.o libc/stdlib.o libc/stdio.o libc/setjmp.o
	$(LD) $(LDFLAGS) -o kernel.elf -N -n -Ttext 0x8800 -e kernel_entry --oformat elf32-i386 \
		kernel/entry.o  \
		kernel/kernel.o kernel/kernel_asm.o \
		kernel/console.o kernel/vgatext.o kernel/serial.o \
		kernel/memorymanagement.o kernel/tasks.o \
		hardware/port.o hardware/port_asm.o \
		hardware/interrupts.o hardware/interrupts_asm.o \
		hardware/pci.o \
		net/ethernet.o net/arp.o net/ipv4.o \
		drivers/driver.o \
		drivers/hdi/mouse.o drivers/hdi/keyboard.o \
		drivers/hdi/ps2/ps2keyboard.o drivers/hdi/ps2/ps2mouse.o \
		drivers/video/video.o \
		drivers/video/vga.o drivers/video/vga_font.o \
		drivers/net/network.o \
		drivers/net/rtl8139.o \
		libc/string.o libc/stdlib.o libc/stdio.o libc/setjmp.o \
		gui/widget.o gui/composite_widget.o gui/window.o \
		gui/desktop.o gui/text_widget.o

magic.bin: boot/magic.asm
	$(NASM) boot/magic.asm -DMAGIC='"$(MAGIC)"' -f bin -o magic.bin
	
kernel/entry.o: kernel/entry.c
	$(CC) $(CFLAGS) -c -o kernel/entry.o kernel/entry.c

kernel/kernel.o: kernel/kernel.c
	$(CC) $(CFLAGS) -c -o kernel/kernel.o kernel/kernel.c

kernel/kernel_asm.o: kernel/kernel.asm
	$(NASM) kernel/kernel.asm $(NASMFLAGS) -o kernel/kernel_asm.o

hardware/port.o: hardware/port.c hardware/port.h
	$(CC) $(CFLAGS) -c -o hardware/port.o hardware/port.c

hardware/port_asm.o: hardware/port.asm
	$(NASM) hardware/port.asm $(NASMFLAGS) -o hardware/port_asm.o

kernel/console.o: kernel/console.c kernel/console.h kernel/vgatext.h kernel/serial.h
	$(CC) $(CFLAGS) -c -o kernel/console.o kernel/console.c

kernel/vgatext.o: kernel/vgatext.c kernel/vgatext.h
	$(CC) $(CFLAGS) -c -o kernel/vgatext.o kernel/vgatext.c

kernel/serial.o: kernel/serial.c kernel/serial.h
	$(CC) $(CFLAGS) -c -o kernel/serial.o kernel/serial.c

kernel/memorymanagement.o: kernel/memorymanagement.c kernel/memorymanagement.h
	$(CC) $(CFLAGS) -c -o kernel/memorymanagement.o kernel/memorymanagement.c

kernel/tasks.o: kernel/tasks.c kernel/tasks.h
	$(CC) $(CFLAGS) -c -o kernel/tasks.o kernel/tasks.c

hardware/interrupts.o: hardware/interrupts.c hardware/interrupts.h
	$(CC) $(CFLAGS) -c -o hardware/interrupts.o hardware/interrupts.c

hardware/interrupts_asm.o: hardware/interrupts.asm
	$(NASM) hardware/interrupts.asm $(NASMFLAGS) -o hardware/interrupts_asm.o

hardware/pci.o: hardware/pci.c hardware/pci.h
	$(CC) $(CFLAGS) -c -o hardware/pci.o hardware/pci.c

network/ethernet.o: network/ethernet.c network/ethernet.h
	$(CC) $(CFLAGS) -c -o network/ethernet.o network/ethernet.c

network/arp.o: network/arp.c network/arp.h
	$(CC) $(CFLAGS) -c -o network/arp.o network/arp.c

network/ipv4.o: network/ipv4.c network/ipv4.h
	$(CC) $(CFLAGS) -c -o network/ipv4.o network/ipv4.c

drivers/driver.o: drivers/driver.c drivers/driver.h
	$(CC) $(CFLAGS) -c -o drivers/driver.o drivers/driver.c

drivers/hdi/mouse.o: drivers/hdi/mouse.c drivers/hdi/mouse.h
	$(CC) $(CFLAGS) -c -o drivers/hdi/mouse.o drivers/hdi/mouse.c

drivers/hdi/keyboard.o: drivers/hdi/keyboard.c drivers/hdi/keyboard.h
	$(CC) $(CFLAGS) -c -o drivers/hdi/keyboard.o drivers/hdi/keyboard.c

drivers/hdi/ps2/ps2keyboard.o: drivers/hdi/ps2/ps2keyboard.c drivers/hdi/ps2/ps2keyboard.h
	$(CC) $(CFLAGS) -c -o drivers/hdi/ps2/ps2keyboard.o drivers/hdi/ps2/ps2keyboard.c

drivers/hdi/ps2/ps2mouse.o: drivers/hdi/ps2/ps2mouse.c drivers/hdi/ps2/ps2mouse.h
	$(CC) $(CFLAGS) -c -o drivers/hdi/ps2/ps2mouse.o drivers/hdi/ps2/ps2mouse.c

drivers/video/video.o: drivers/video/video.c drivers/video/video.h
	$(CC) $(CFLAGS) -c -o drivers/video/video.o drivers/video/video.c

drivers/video/vga.o: drivers/video/vga.c drivers/video/vga.h
	$(CC) $(CFLAGS) -c -o drivers/video/vga.o drivers/video/vga.c

drivers/network/network.o: drivers/network/network.c drivers/network/network.h
	$(CC) $(CFLAGS) -c -o drivers/network/network.o drivers/network/network.c

drivers/network/rtl8139.o: drivers/network/rtl8139.c drivers/network/rtl8139.h
	$(CC) $(CFLAGS) -c -o drivers/network/rtl8139.o drivers/network/rtl8139.c

libc/string.o: libc/string.c libc/string.h
	$(CC) $(CFLAGS) -c -o libc/string.o libc/string.c

libc/stdlib.o: libc/stdlib.c libc/stdlib.h
	$(CC) $(CFLAGS) -c -o libc/stdlib.o libc/stdlib.c

libc/stdio.o: libc/stdio.c libc/stdio.h
	$(CC) $(CFLAGS) -c -o libc/stdio.o libc/stdio.c

libc/setjmp.o: libc/setjmp.asm
	$(NASM) libc/setjmp.asm $(NASMFLAGS) -o libc/setjmp.o

gui/widget.o: gui/widget.c gui/widget.h
	$(CC) $(CFLAGS) -c -o gui/widget.o gui/widget.c

gui/composite_widget.o: gui/composite_widget.c gui/composite_widget.h
	$(CC) $(CFLAGS) -c -o gui/composite_widget.o gui/composite_widget.c

gui/window.o: gui/window.c gui/window.h
	$(CC) $(CFLAGS) -c -o gui/window.o gui/window.c

gui/desktop.o: gui/desktop.c gui/desktop.h
	$(CC) $(CFLAGS) -c -o gui/desktop.o gui/desktop.c

gui/text_widget.o: gui/text_widget.c gui/text_widget.h
	$(CC) $(CFLAGS) -c -o gui/text_widget.o gui/text_widget.c

clean:
	-rm -f boot.bin kernel.bin kernel.sym kernel.elf image.bin magic.bin boot.map image.tmp \
		serial.log \
		libc/*.o hardware/*.o kernel/*.o \
		drivers/*.o drivers/*/*.o drivers/*/*/*.o gui/*.o

run-qemu-hd: image.bin
	$(QEMU) -cpu 486 -usb -netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16 -device rtl8139,netdev=net0-d guest_errors -m 32 -drive "file=image.bin,if=ide,format=raw" \
		-serial file:serial.log

run-qemu-usb: image.bin
	$(QEMU) -cpu 486 -usb -netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16 -device rtl8139,netdev=net0-d guest_errors -m 32 -usb -usbdevice disk:/dev/sde \
		-serial file:serial.log

run-qemu: image.bin
	$(QEMU) -cpu 486 -usb \
		-netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16,hostfwd=tcp::8080-:80,hostfwd=udp::8081-:81 \
		-device rtl8139,netdev=net0 \
		-object filter-dump,id=net0,netdev=net0,file=network.log \
		-d guest_errors -m 32 -drive "file=image.bin,if=floppy,format=raw" \
		-serial file:serial.log

run-qemu-debug: image.bin
	$(QEMU) -cpu 486 -usb \
		-netdev user,id=net0,net=10.0.0.0/24,host=10.0.0.2,dhcpstart=10.0.0.16,hostfwd=tcp::8080-:80,hostfwd=udp::8081-:81 \
		-device rtl8139,netdev=net0 \
		-object filter-dump,id=net0,netdev=net0,file=network.log \
		-S -s -d guest_errors -m 32 -drive "file=image.bin,if=floppy,format=raw" \
		-serial file:serial.log

run-bochs:
	bochs -q -f bochs.config 'boot:floppy' 'floppya: 1_44=image.bin, status=inserted'

run-bochs-hd:
	bochs -q -f bochs.config 'boot:disk' 'ata0-master: type=disk, path=image.bin, mode=flat, cylinders=64, heads=4, spt=8, translation=none'