initial commit

Makefile

@@ -0,0 +1,72 @@
+MAKE := make
+
+ARCH := aarch64
+GNU := $(ARCH)-linux-gnu
+
+QEMU := qemu-system-$(ARCH)
+QEMUFLAGS += -M raspi3b -display none -serial null -serial pty
+
+CC := $(GNU)-gcc
+CCFLAGS += -Wall -Wextra -O0 \
+					 -nostdinc -nostdlib -nostartfiles -nodefaultlibs \
+					 -Wno-unused-parameter -Wno-main -g
+LD := $(GNU)-ld
+LDFLAGS += -g -nostdlib
+OBJCOPY := $(GNU)-objcopy
+
+#TARGET := kernel8
+#TARGET_DIR := ./kernel
+ELF := $(TARGET).elf
+IMG := $(TARGET).img
+
+LD_SCRIPT := $(TARGET_DIR)/linker.ld
+INCLUDE += -Iinclude
+LIB_DIR := ./lib
+MISC_DIR := ./misc
+#QEMUFLAGS += -dtb $(MISC_DIR)/bcm2710-rpi-3-b-plus.dtb
+
+BOOTLOADER_DIR := ./bootloader
+ROOTFS_DIR := ./rootfs
+
+CPIO := initramfs.cpio
+QEMUFLAGS += -initrd $(CPIO)
+
+SRCS := $(shell find $(TARGET_DIR) -name '*.[cS]') \
+				$(shell find $(LIB_DIR) -name '*.c')
+OBJS := $(SRCS:%=%.o)
+
+.PHONY: all build clean clean_target run
+
+all:
+	$(MAKE) build TARGET_DIR=./kernel TARGET=kernel8
+	$(MAKE) build TARGET_DIR=./bootloader TARGET=bootloader
+
+build: $(IMG)
+
+$(CPIO): $(shell find $(ROOTFS_DIR))
+	cd $(ROOTFS_DIR) && find . | cpio -o -H newc > ../$@
+
+$(IMG): $(ELF)
+	$(OBJCOPY) -O binary $< $@
+
+$(ELF): $(LD_SCRIPT) $(OBJS)
+	$(LD) -o $@ -T $^ $(LDFLAGS)
+
+%.S.o: %.S
+	mkdir -p $(dir $@)
+	$(CC) -c $< -o $@ $(INCLUDE) $(CCFLAGS)
+
+%.c.o: %.c
+	mkdir -p $(dir $@)
+	$(CC) -c $< -o $@ $(INCLUDE) $(CCFLAGS)
+
+clean:
+	$(MAKE) clean_target TARGET_DIR=./kernel TARGET=kernel8
+	$(MAKE) clean_target TARGET_DIR=./bootloader TARGET=bootloader
+
+clean_target:
+	-rm $(OBJS) $(ELF) $(IMG) $(CPIO)
+
+run: all $(CPIO)
+	$(QEMU) -kernel bootloader.img $(QEMUFLAGS)
+	#$(QEMU) -kernel kernel8.img $(QEMUFLAGS)