GPP_ARGS = -Wall -Wextra -O3 -ggdb -I include \
  -ffreestanding -fno-exceptions -fno-rtti -mno-sse
KGPP_ARGS = ${GPP_ARGS}
AGPP_ARGS = ${GPP_ARGS}

LD_ARGS = -z noexecstack
KLD_ARGS = -T kernel/link.ld ${LD_ARGS}
ALD_ARGS = -T applications/link.ld ${LD_ARGS}
LLD_ARGS = ${LD_ARGS}

all: out/disk.iso

run: out/disk.iso
	gdb -x qemu.gdb

clean:
	rm -rf obj out

dist-clean:
	rm -rf limine
	rm -f include/mercury/kernel/limine.hpp

limine:
	git clone --depth=1 -b v6.x-branch \
	  https://github.com/limine-bootloader/limine.git limine
	cd limine && ./bootstrap && ./configure -q --enable-bios --enable-bios-cd
	+make -C limine
	cp limine/limine.h include/mercury/kernel/limine.hpp

obj/kernel/entry.cpp.o: kernel/entry.cpp limine
	@mkdir -p $(@D)
	g++ -c ${KGPP_ARGS} $< -o $@

obj/kernel/%.cpp.o: kernel/%.cpp
	@mkdir -p $(@D)
	g++ -c ${KGPP_ARGS} $< -o $@

obj/kernel/%.asm.o: kernel/%.asm
	@mkdir -p $(@D)
	nasm -f elf64 $< -o $@

KERNEL_OBJECTS = allocator.cpp application.cpp entry.cpp framebuffer.cpp \
  paging.asm paging.cpp storage.cpp storage/bd/memory.cpp terminal.cpp \
  storage/fs/tarfs.cpp utility.cpp vfile.cpp syscall.asm syscall.cpp \
  interrupts.asm interrupts.cpp
obj/kernel.elf: ${KERNEL_OBJECTS:%=obj/kernel/%.o}
	ld ${KLD_ARGS} $^ -o $@

obj/stdlib/%.asm.o: stdlib/%.asm
	@mkdir -p $(@D)
	nasm -f elf64 $< -o $@

obj/stdlib/%.cpp.o: stdlib/%.cpp
	@mkdir -p $(@D)
	g++ -c ${AGPP_ARGS} $< -o $@

STDLIB_OBJECTS = entry.cpp syscall.asm
obj/stdlib.o: ${STDLIB_OBJECTS:%=obj/stdlib/%.o}
	ld -r ${LLD_ARGS} $^ -o $@

obj/%.cpp.o: applications/%.cpp
	@mkdir -p $(@D)
	g++ -c ${AGPP_ARGS} $< -o $@

INIT_OBJECTS = main.cpp
obj/initfs/bin/init.elf: ${INIT_OBJECTS:%=obj/init/%.o} obj/stdlib.o
	@mkdir -p $(@D)
	ld ${ALD_ARGS} $^ -o $@

APPLICATIONS = init
obj/initfs.tgz: ${APPLICATIONS:%=obj/initfs/bin/%.elf}
	tar czf obj/initfs.tgz -C obj/initfs .

out/disk.iso: obj/kernel.elf obj/initfs.tgz limine
	mkdir -p obj/iso out
	cp obj/kernel.elf obj/initfs.tgz limine/bin/limine-bios.sys \
	  limine/bin/limine-bios-cd.bin limine.cfg obj/iso/
	cp terminus/ter-u16b.psf obj/iso/termfont.psf
	xorriso -as mkisofs -quiet -no-emul-boot -boot-info-table \
	  -boot-load-size 4 -b limine-bios-cd.bin obj/iso -o $@
	limine/bin/limine bios-install $@
	rm -rf obj/iso