.POSIX:
.PHONY: all clean run

# QFLAGS = -machine type=pc,accel=kvm -cpu Broadwell-v3

CC = x86_64-elf-gcc
CFLAGS = -Wall -Wextra -std=c99 -pedantic -O2 -pipe \
	-ffreestanding -mno-red-zone -mno-mmx -mno-sse -mno-sse2
LDFLAGS = -Wl,-O1 -T link.ld
LDLIBS = -lgcc -nostdlib

CSRC = kernel/main.c
FSRC = boot/boot.asm kernel/util.asm
OBJ = ${CSRC:.c=.o} ${FSRC:.asm=.o}

all: providence.img

boot/boot.o: boot/bios.inc boot/page.inc boot/segdesc.inc
kernel/main.o: kernel/util.h

providence.img: ${OBJ}
	${CC} ${LDFLAGS} $^ ${LDLIBS} -o $@
	@du -b $@
	truncate -s 29696 $@

%.o: %.c
	${CC} ${CFLAGS} -c -o $@ $<

%.o: %.asm
	fasm $< $@

clean:
	rm -f ${OBJ} providence.img

run: all
	qemu-system-x86_64 ${QFLAGS} -drive file=providence.img,format=raw,index=0,media=disk