usr = upstream/install
PATH := $(usr)/bin:$(PATH)
export PATH

tasks = upstream/tasks
usr = $(shell pwd)/upstream/install

all: image

$(tasks)/%:
	$(MAKE) -C upstream tasks/$* usr="$(usr)"

upstream_clean_%:
	$(MAKE) -C upstream clean_$* usr="$(usr)"

BOCHS = /Applications/Bochs-2.1.1/bochs.app/Contents/MacOS/bochs
NASM = nasm
LD = i386-unknown-elf-ld
CC = i386-unknown-elf-gcc
CFLAGS = -O2 -Isrc -Wall -Werror
LDFLAGS = 

BOOTSECT = build/bootsect.bin
LOADER = build/loader.bin
KERNEL = build/kernel.bin

build/%.bin: src/%.asm $(tasks)/build_nasm
	@mkdir -p `dirname $@`
	$(NASM) -f bin -o $@ $<

build/%.o: src/%.asm $(tasks)/build_nasm
	@mkdir -p `dirname $@`
	$(NASM) -f elf -o $@ $<
	
build/%.o: build/%.asm $(tasks)/build_nasm
	@mkdir -p `dirname $@`
	$(NASM) -f elf -o $@ $<
	
build/%.o: src/%.c $(tasks)/build_gcc
	@mkdir -p `dirname $@`
	$(CC) $(CFLAGS) -c -o $@ $<

build/int.asm: scripts/mkintasm.pl
	perl scripts/mkintasm.pl > $@

build/kernel.bin: $(patsubst %, build/%.o, main lib int keyboard console memory timer)
	$(LD) --oformat binary -T src/kernel.ld -o $@ $^

image: $(BOOTSECT) $(LOADER) $(KERNEL)
	@rm -f $@
	dd if=$(BOOTSECT) of=$@ bs=512 seek=0 conv=sync
	dd if=$(LOADER)   of=$@ bs=512 seek=1 conv=sync
	dd if=$(KERNEL)   of=$@ bs=512 seek=2 conv=sync

test: image
	$(BOCHS) -q -f bochsrc	

clean:
	rm -rf build/*