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O := BUILD
$(O)/boot: $(O)/boot.elf | dump_info
objcopy -O binary $< $@
$(O)/boot.elf: mbr.ld $(O)/mbr.o $(O)/zmbr.o
ld -o $@ -nostdlib -T $^
$(O)/mbr.o: mbr.S | $(O)
gcc -m32 -c -o $@ -ffreestanding mbr.S
$(O)/zmbr.o: zmbr.zig | $(O)
zig build-obj -femit-bin=$@ -target x86-freestanding-none -O ReleaseSmall $<
clean:
$(RM) -r $(O)
$(O):
mkdir -p $(O)
dump_info: $(O)/boot.elf
objdump -Mintel --disassemble=kmain --visualize-jumps=extended-color $<
readelf -W -l $<
size $<
size $< | awk '/$(notdir $<)/ { print "MBR utilization " $$1/512 "%" }'
run: $(O)/boot
qemu-system-i386 -hda $< $(QEMU_ARGS)
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