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PATH := $(shell pwd)/toolchain/bin/:$(PATH)
AS = i686-elf-as
CC = i686-elf-gcc
CHECK = sparse
CFLAGS = -std=gnu99 -ffreestanding -O2 -Wall -Wextra -Wold-style-definition
CFLAGS += -mgeneral-regs-only
CFLAGS += -Isrc/
LFLAGS = -ffreestanding -O2 -nostdlib -lgcc
QFLAGS = -no-reboot -serial stdio -display none
define from_sources
$(patsubst src/%.s,out/obj/%.s.o,$(shell find $(1) -type f -name '*.s')) \
$(patsubst src/%.c,out/obj/%.c.o,$(shell find $(1) -type f -name '*.c'))
endef
.PHONY: all boot debug lint check clean
all: out/boot.iso check
boot: all
touch out/disk # TODO this is temporary
qemu-system-i386 -cdrom out/boot.iso $(QFLAGS) -no-shutdown \
-drive file=out/disk,format=raw,media=disk
debug: all
qemu-system-i386 -cdrom out/boot.iso $(QFLAGS) -s -S &
@sleep 1
gdb
lint:
@tools/linter/main.rb
check: $(shell find src/kernel/ -type f -name *.c)
@echo $^ | xargs -n 1 sparse $(CFLAGS)
clean:
rm -rv out/
out/boot.iso: out/fs/boot/kernel.bin out/fs/boot/grub/grub.cfg out/fs/boot/init
@grub-mkrescue -o $@ out/fs/ > /dev/null 2>&1
out/fs/boot/kernel.bin: src/kernel/linker.ld $(call from_sources, src/kernel/)
@mkdir -p $(@D)
@$(CC) $(LFLAGS) -T $^ -o $@
grub-file --is-x86-multiboot $@
out/raw_init: src/init/linker.ld $(call from_sources, src/init/)
@mkdir -p $(@D)
@$(CC) $(LFLAGS) -T $^ -o $@
out/initrd.tar: $(shell find initrd/)
cd initrd; tar cf ../$@ *
out/fs/boot/init: out/raw_init out/initrd.tar
@mkdir -p $(@D)
@cat $^ > $@
out/fs/boot/grub/grub.cfg: grub.cfg
@mkdir -p $(@D)
@cp $< $@
out/obj/%.s.o: src/%.s
@mkdir -p $(@D)
@$(AS) $^ -o $@
out/obj/%.c.o: src/%.c
@mkdir -p $(@D)
@$(CC) $(CFLAGS) -c $^ -o $@
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