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EXTERNAL_DIR=/yerba/external
BUILD_DIR=/yerba/build
LINUX_DIR=$(EXTERNAL_DIR)/linux
LINUX_REPO=https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
BUSYBOX_DIR=$(EXTERNAL_DIR)/busybox
BUSYBOX_REPO=https://git.busybox.net/busybox
INITRAMFS_INIT=initramfs_init
.PHONY: all kernel initramfs iso run clean
all: iso
$(EXTERNAL_DIR):
@mkdir -p $(EXTERNAL_DIR)
$(BUILD_DIR):
@mkdir -p $(BUILD_DIR)
$(LINUX_DIR): $(EXTERNAL_DIR)
@echo "[yerba] cloning Linux kernel..."
git clone --depth 1 $(LINUX_REPO) $(LINUX_DIR)
kernel: $(LINUX_DIR) $(BUILD_DIR)
@echo "[yerba] building kernel (default defconfig)..."
$(MAKE) -C $(LINUX_DIR) defconfig
$(MAKE) -C $(LINUX_DIR) -j$(shell nproc) bzImage
cp $(LINUX_DIR)/arch/x86/boot/bzImage $(BUILD_DIR)/bzImage
initramfs: busybox kernel
@echo "[yerba] creating initramfs..."
rm -rf $(BUILD_DIR)/initramfs
mkdir -p $(BUILD_DIR)/initramfs/{bin,sbin,etc,proc,sys,dev}
cp -a $(BUSYBOX_DIR)/_install/. $(BUILD_DIR)/initramfs/
cp initramfs_init $(BUILD_DIR)/initramfs/init
chmod +x $(BUILD_DIR)/initramfs/init
cd $(BUILD_DIR)/initramfs && find . | cpio -o -H newc | gzip > $(BUILD_DIR)/initramfs.cpio.gz
$(BUSYBOX_DIR): $(EXTERNAL_DIR)
@echo "[yerba] cloning BusyBox..."
git clone --depth 1 $(BUSYBOX_REPO) $(BUSYBOX_DIR)
busybox: $(BUSYBOX_DIR) $(BUILD_DIR)
@echo "[yerba] building BusyBox..."
$(MAKE) -C $(BUSYBOX_DIR) defconfig
$(MAKE) -C $(BUSYBOX_DIR) -j$(shell nproc)
$(MAKE) -C $(BUSYBOX_DIR) CONFIG_PREFIX=$(BUSYBOX_DIR)/_install install
iso: kernel initramfs busybox
@echo "[yerba] TODO: make this output an ISO when ready"
@echo "[yerba] Kernel located at $(BUILD_DIR)/bzImage"
@echo "[yerba] Initramfs located at $(BUILD_DIR)/initramfs.cpio.gz"
clean:
rm -rf $(EXTERNAL_DIR) $(BUILD_DIR)
run: iso
@echo "[yerba] booting in QEMU..."
qemu-system-x86_64 -kernel $(BUILD_DIR)/bzImage -initrd $(BUILD_DIR)/initramfs.cpio.gz -nographic -append "console=ttyS0"
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