csrc = $(wildcard src/*.c) $(wildcard src/libc/*.c)
ssrc = $(wildcard src/*.asm) $(wildcard src/libc/*.asm)
obj = $(csrc:.c=.o) $(ssrc:.asm=-asm.o)
dep = $(csrc:.c=.d)

bin = 86kern
elf = $(bin).elf
img360 = $(bin)-fd360.img
img1440 = $(bin)-fd1440.img
img = $(img1440)
sym = $(bin).sym

TOOLPREFIX = ia16-elf-
CC = $(TOOLPREFIX)gcc
LD = $(TOOLPREFIX)ld
OBJCOPY = $(TOOLPREFIX)objcopy

warn = -pedantic -Wall
inc = -nostdinc -Isrc -Isrc/libc
arch = -march=i8088 -mtune=i8088

CFLAGS = $(arch) -ffreestanding -mcmodel=small $(warn) $(inc) -MMD
LDFLAGS = -T kern.ld -Map kern.map

.PHONY: all
all: $(img360) $(img1440)

$(img360): $(bin)
	dd if=/dev/zero of=$@ bs=512 count=720 status=none
	dd if=$< of=$@ bs=512 conv=notrunc status=none
	tools/fixfdimg $@ 360

$(img1440): $(bin)
	dd if=/dev/zero of=$@ bs=512 count=2880 status=none
	dd if=$< of=$@ bs=512 conv=notrunc status=none
	tools/fixfdimg $@ 1440

$(bin): $(elf)
	$(OBJCOPY) -O binary $< $@

$(sym): $(elf)
	$(OBJCOPY) --only-keep-debug $< $@

$(elf): $(obj)
	$(LD) -o $@ $(obj) $(LDFLAGS)

-include $(dep)

%-asm.o: %.asm
	nasm -o $@ -f elf $<

.PHONY: clean
clean:
	rm -f $(obj) $(bin)

.PHONY: cleandep
cleandep:
	rm -f $(dep)

.PHONY: run
run: $(img)
	qemu-system-i386 -fda $(img) -serial file:ser1.log -serial file:ser2.log

.PHONY: debug
debug: $(img) $(bin).sym
	qemu-system-i386 -fda $(img) -serial file:ser1.log -serial file:ser2.log -s -S &
	gdb

.PHONY: disasm
disasm: $(bin)
	ndisasm -o 0x600 $< >dis