# $Id$
ARCH := i386
ifeq ($(ARCH),i386)
BITS = 32
endif
CC := cc
LD := $(LD)
ASM := as
CFLAGS := -m$(BITS) -Wall -c -Iinclude -Ilibcinclude -nostdlib -ffreestanding
CFLAGS_C486SW := -std=c89 $(CFLAGS) -Dasm=__asm__

.PHONY: all clean

BASIC := bin/c486sw
DRIVERS := rtk8139
DRIVERS2 := ata #Custom init
SYSCALLS := mount

limine-build: c486sw-limine.iso
grub-build: c486sw-grub.iso

all: c486sw-limine.iso

clean:
	mkdir -p bin obj lib
	rm -f bin/*
	rm -f obj/*
	rm -f lib/*
	rm -f include/kern/drivers.h
	rm -f c486sw-*.iso
	rm -rf arith64

dist/limine.bin:
	tnftp -o $@ https://github.com/limine-bootloader/limine/raw/v5.x-branch-binary/limine-bios-cd.bin

dist/limine.sys:
	tnftp -o $@ https://github.com/limine-bootloader/limine/raw/v5.x-branch-binary/limine-bios.sys

obj/k%_asm.o: kernsrc/%.s
	nasm -felf$(BITS) -o $@ $<

obj/k%_gnuasm.o: kernsrc/%gnu.s
	$(ASM) --32 -o $@ $<

obj/kkernel.o: kernsrc/kernel.c include/kern/config.h
	echo \#include \<types.h\> > include/kern/drivers.h
	echo \#include \<kern/driver.h\> >> include/kern/drivers.h
	echo $(addprefix %\#include ,$(addsuffix .h\>,$(addprefix \<dri/,$(DRIVERS)))) | tr '%' '\n' >> include/kern/drivers.h
	echo "$(addprefix struct+driver_generic*+,$(addsuffix _init(uint16_t+bus,+uint16_t+device);,$(DRIVERS)))" | tr '%' '\n' | tr '+' ' ' >> include/kern/drivers.h
	$(CC) $(CFLAGS_C486SW) -o $@ $<
	
obj/k%.o: kernsrc/%.c include/kern/%.h include/kern/config.h
	$(CC) $(CFLAGS_C486SW) -o $@ $<

obj/d%.o: kernsrc/dri/%.c include/dri/%.h include/kern/config.h
	$(CC) $(CFLAGS_C486SW) -o $@ $<

obj/f%.o: kernsrc/fs/%.c include/fs/%.h include/kern/config.h
	$(CC) $(CFLAGS_C486SW) -o $@ $<

obj/casm_%.o: libcsrc/%.s
	nasm -felf$(BITS) -o $@ $<

obj/c%.o: libcsrc/%.c libcinclude/%.h
	$(CC) $(CFLAGS_C486SW) -o $@ $<

obj/test.arith64:
	if [ ! -e arith64 ]; then git clone https://github.com/glitchub/arith64 ; fi
	cd arith64 && $(CC) $(CFLAGS) -o arith64.o arith64.c
	cp arith64/arith64.o $@

lib/libc.a:	obj/cmount.o \
		obj/casm_sym.o \
		obj/test.arith64
	ar -crs $@ $^

lib/linkthis.o:	libcsrc/linkthis.s
	nasm -DC486SW_VERSION=$(shell grep -m 1 VERSION include/kern/config.h | grep -oE "\"[^\"]+\"" | sed -E 's/"/\\"/g') -DC486SW_RAW_VERSION=$(shell grep -m 1 VERSION include/kern/config.h | grep -oE "\"[^\"]+\"" | sed -E 's/"|\.//g') -felf$(BITS) -o $@ $<

bin/c486sw:	obj/kboot_$(GNU)asm.o \
		obj/kkernel.o \
		obj/kio.o \
		obj/kpic.o \
		obj/ktask.o \
		obj/ktask_asm.o \
		obj/ktimer.o \
		obj/kpci.o \
		obj/ksyscall.o \
		obj/fdevfs.o \
		$(addsuffix .o,$(addprefix obj/d,$(DRIVERS))) \
		$(addsuffix .o,$(addprefix obj/d,$(DRIVERS2))) \
		$(addsuffix .o,$(addprefix obj/ksc_,$(SYSCALLS))) \
		lib/libc.a \
		lib/linkthis.o
	$(LD) -melf_$(ARCH) -T linker.ld -o $@ -nostdlib $^

c486sw-limine.iso: $(BASIC) dist/limine.cfg dist/limine.bin dist/limine.sys
	rm -rf iso
	mkdir -p iso/include
	mkdir -p iso/lib
	cp bin/c486sw iso/
	cp -rf libcinclude/* iso/include/
	cp -rf include/* iso/include/
	cp -rf dist/limine.cfg iso/
	cp -rf lib/* iso/lib/
	cp -rf dist/limine.bin iso/limine-bios-cd.bin
	cp -rf dist/limine.sys iso/limine-bios.sys
	cd iso && xorrisofs -o ../$@ -b limine-bios-cd.bin -no-emul-boot -boot-load-size 4 -boot-info-table -J -R -l -allow-leading-dots -V "C486SW_LIVE" .
	limine bios-install $@

c486sw-grub.iso: $(BASIC) dist/grub.cfg
	rm -rf iso
	mkdir -p iso/boot/grub
	mkdir -p iso/include
	mkdir -p iso/lib
	cp bin/c486sw iso/
	cp -rf libcinclude/* iso/include/
	cp -rf include/* iso/include/
	cp -rf dist/grub.cfg iso/boot/grub/
	cp -rf lib/* iso/lib/
	grub-mkrescue -J -R -l -V "C486SW_LIVE" -allow-leading-dots -o $@ iso