NoviumOS/Makefile at main · alexdev8930/NoviumOS · GitHub

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VERSION = 0
PATCHLEVEL = 9
SUBLEVEL = 0
EXTRAVERSION =
VERSION_TAG = $(VERSION).$(PATCHLEVEL)$(if $(filter-out 0,$(SUBLEVEL)),.$(SUBLEVEL))$(EXTRAVERSION)

CC = gcc
LD = ld
QEMU ?= qemu-system-i386
GRUB_MKRESCUE ?= grub-mkrescue

ARCH ?= x86_32

BUILD_DIR = build
VPATH = init drivers/video drivers/input kernel lib mm ipc arch/$(ARCH)/boot arch/$(ARCH)/kernel

DRIVE_FLAGS ?= -hda
QEMU_FLAGS ?= -m 64M -serial stdio

GRUB_CFG = arch/$(ARCH)/boot/grub/grub.cfg
ISO_ROOT = $(BUILD_DIR)/iso/staging
ISO_IMAGE = $(BUILD_DIR)/iso/novium-v$(VERSION_TAG).iso

ifeq ($(ARCH),x86_32)
CFLAGS_ARCH  = -m32
LDFLAGS_ARCH = -m elf_i386
else
$(error unsupported ARCH '$(ARCH)')
endif

CPPFLAGS = -I. -Iinclude -Iarch/$(ARCH)/include

CFLAGS = $(CFLAGS_ARCH) \
         -ffreestanding \
         -fno-builtin \
         -fno-stack-protector \
         -fno-pie \
         -mno-sse \
         -mno-sse2 \
         -O2 \
         -g \
         -Wall \
         -Wextra \
         -MMD \
         -MP

LDFLAGS = $(LDFLAGS_ARCH) \
          -T arch/$(ARCH)/kernel/link.ld

KERNEL_OBJS = \
    $(BUILD_DIR)/multiboot.o \
    $(BUILD_DIR)/bootstrap.o \
    $(BUILD_DIR)/hw_init.o \
    $(BUILD_DIR)/irq.o \
    $(BUILD_DIR)/isr.o \
    $(BUILD_DIR)/debug.o \
    $(BUILD_DIR)/ps2.o \
    $(BUILD_DIR)/keyboard.o \
    $(BUILD_DIR)/pit.o \
    $(BUILD_DIR)/vga_console.o \
    $(BUILD_DIR)/string.o \
    $(BUILD_DIR)/stdio.o \
    $(BUILD_DIR)/page_alloc.o \
    $(BUILD_DIR)/paging.o \
    $(BUILD_DIR)/main.o \
    $(BUILD_DIR)/sched.o \
    $(BUILD_DIR)/process.o \
    $(BUILD_DIR)/switch.o \
    $(BUILD_DIR)/heap.o \
    $(BUILD_DIR)/ipc.o \
    $(BUILD_DIR)/message.o \
    $(BUILD_DIR)/sync.o

# Header dependencies collected by -MMD, one .d next to each .o
KERNEL_DEPS = $(KERNEL_OBJS:.o=.d)

.PHONY: all iso run clean

all: $(ISO_IMAGE)

$(BUILD_DIR):
	mkdir -p $(BUILD_DIR)

# VPATH finds the .c/.S files in the dirs listed above
$(BUILD_DIR)/%.o: %.c | $(BUILD_DIR)
	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@

$(BUILD_DIR)/%.o: %.S | $(BUILD_DIR)
	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@

# Pull in the header dependencies.  A missing .d is fine on a fresh tree, and
# -MP keeps a deleted header from turning into a "no rule to make target" stop.
-include $(KERNEL_DEPS)

$(BUILD_DIR)/kernel.elf: $(KERNEL_OBJS) arch/$(ARCH)/kernel/link.ld
	$(LD) $(LDFLAGS) $(KERNEL_OBJS) -o $@

$(ISO_IMAGE): $(BUILD_DIR)/kernel.elf $(GRUB_CFG) | $(BUILD_DIR)
	mkdir -p $(ISO_ROOT)/boot/grub
	cp $(BUILD_DIR)/kernel.elf $(ISO_ROOT)/boot/novium
	cp $(GRUB_CFG) $(ISO_ROOT)/boot/grub/grub.cfg
	$(GRUB_MKRESCUE) -o $@ $(ISO_ROOT)

iso: $(ISO_IMAGE)

run: $(ISO_IMAGE)
	$(QEMU) $(QEMU_FLAGS) $(DRIVE_FLAGS) $(ISO_IMAGE)

clean:
	rm -rf $(BUILD_DIR)