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O := BUILD
$(O)/disk.img: $(O)/kern grub
mkdir -p $(O)/iso/boot
rsync -rav $^ $(O)/iso/boot
grub-mkrescue -o '$@' $(O)/iso
# When building the kernel we explicitly let the zig compiler emit code for a
# very old cpu. This way we ensure it does not emit any sse instructions, which
# first need to be enabled before the can be used (setting up ctrl registers and
# sse state).
$(O)/kern: kern.ld kern.zig
mkdir -p $(O)
zig build-exe -fno-unwind-tables -femit-bin=$@ -target x86-freestanding-none -mcpu i386 -O Debug -fno-strip --script $^
xxd -d -e -c4 $@ | awk -f scripts/check_mbhdr.awk
objdump -d $@ | awk -f scripts/check_sse.awk
clean:
$(RM) -r $(O)
run: $(O)/kern
qemu-system-i386 -kernel $< -append mode=raw-elf
run-img: $(O)/disk.img
qemu-system-i386 -hda $<
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