GMS Linux: start?

2025-12-30 01:20:20 +00:00
commit ac241a9148
48 changed files with 2028 additions and 0 deletions
@@ -0,0 +1,161 @@
+# ==============================================================================
+# 1. Variables
+# ==============================================================================
+KERNEL_DIR   	= linux
+INIT_DIR     	= init
+USERPROG_DIR 	= userprog
+GRUB_DIR    	= grub
+BUILD_DIR   	= build
+
+USER_OUT_DIR 	= $(BUILD_DIR)/userprog
+INIT_OUT_DIR 	= $(BUILD_DIR)/init
+
+# [AUTOMATION]
+USER_DIRS    	= $(wildcard $(USERPROG_DIR)/*)
+USER_NAMES   	= $(notdir $(USER_DIRS))
+USER_BINS    	= $(addprefix $(USER_OUT_DIR)/, $(USER_NAMES))
+
+# Config & Tools
+DISK_SIZE_MB 	= 512
+
+ROOT_SIZE_MB 	= 256
+ROOT_SECTORS 	= $$(($(ROOT_SIZE_MB) * 2048))
+ROOT_OFFSET  	= 2048
+
+HOME_SIZE_MB 	= 128
+HOME_SECTORS 	= $$(($(HOME_SIZE_MB) * 2048))
+HOME_OFFSET  	= $$(($(ROOT_OFFSET) + $(ROOT_SECTORS)))
+
+GRUB_LIB     	= /usr/lib/grub/i386-pc
+DD           	= dd status=none
+DEBUGFS      	= debugfs
+
+# Sources & Artifacts
+KERNEL_SRC_BIN 	= $(KERNEL_DIR)/arch/x86/boot/bzImage
+INIT_SRC       	= $(INIT_DIR)/init.c
+GRUB_CFG_SRC   	= $(GRUB_DIR)/grub.cfg
+
+INIT_BIN       	= $(INIT_OUT_DIR)/init
+
+DISK_IMG       	= $(BUILD_DIR)/disk.img
+ROOT_IMG		= $(BUILD_DIR)/rootfs.img
+HOME_IMG     	= $(BUILD_DIR)/homefs.img
+CORE_IMG       	= $(BUILD_DIR)/core.img
+
+# ==============================================================================
+# 2. Main Targets
+# ==============================================================================
+.PHONY: all clean run dirs help force_look
+
+all: dirs $(DISK_IMG)
+	@echo " [DONE]  Image ready: $(DISK_IMG)"
+
+run: $(DISK_IMG)
+	qemu-system-x86_64 -drive file=$(DISK_IMG),format=raw -nographic \
+		-net nic,model=e1000 -net user
+
+dirs:
+	@mkdir -p $(BUILD_DIR) $(USER_OUT_DIR) $(INIT_OUT_DIR)
+# 	@mkdir -p $(USER_OUT_DIR)
+# 	@mkdir -p $(INIT_OUT_DIR)
+
+clean:
+	@echo " [CLEAN] Cleaning root build dir..."
+	@rm -rf $(BUILD_DIR)
+	@echo " [CLEAN] Cleaning user programs..."
+	@# 각 유저 프로그램 폴더 들어가서 make clean 실행
+	@for dir in $(USER_DIRS); do \
+		if [ -f $$dir/Makefile ]; then $(MAKE) -C $$dir clean; fi; \
+	done
+
+clean-kernel:
+	@$(MAKE) -C $(KERNEL_DIR) clean
+
+# ==============================================================================
+# 3. Build Rules
+# ==============================================================================
+
+$(INIT_BIN): $(INIT_SRC) | dirs
+	@echo " [CC]    Compiling init..."
+	@gcc -static -o $@ $<
+
+$(USER_BINS): $(USER_OUT_DIR)/%: force_look | dirs
+	@echo " [MAKE]  Entering directory: $(USERPROG_DIR)/$*"
+	@$(MAKE) -s -C $(USERPROG_DIR)/$* OUT_BIN=$(abspath $@) --no-print-directory
+
+force_look:
+	@true
+
+$(KERNEL_SRC_BIN):
+	@echo " [MAKE]  Checking Kernel..."
+	@$(MAKE) -C $(KERNEL_DIR) -j$$(nproc) bzImage
+
+$(CORE_IMG): | dirs
+	@grub-mkimage -O i386-pc -o $@ -p "(hd0,msdos1)/boot/grub" biosdisk part_msdos ext2 linux configfile normal boot
+
+$(ROOT_IMG): $(INIT_BIN) $(USER_BINS) $(KERNEL_SRC_BIN) $(GRUB_CFG_SRC) | dirs
+	@echo " [ROOT]  Generating Root Filesystem..."
+	
+	@$(DD) if=/dev/zero of=$@ bs=1M count=$(ROOT_SIZE_MB)
+	@mkfs.ext4 -q -O ^64bit,^metadata_csum $@
+
+	@echo "         -> Creating Directory Structure..."
+	@$(DEBUGFS) -w -R "mkdir /boot" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /boot/grub" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /bin" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /dev" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /proc" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /sys" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /tmp" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "mkdir /home" $@ > /dev/null 2>&1
+
+	@echo "         -> Injecting System Binaries..."
+	@$(DEBUGFS) -w -R "write $(INIT_BIN) /init" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "write $(KERNEL_SRC_BIN) /boot/bzImage" $@ > /dev/null 2>&1
+	@$(DEBUGFS) -w -R "write $(GRUB_CFG_SRC) /boot/grub/grub.cfg" $@ > /dev/null 2>&1
+
+	@for prog in $(USER_NAMES); do \
+		$(DEBUGFS) -w -R "write $(USER_OUT_DIR)/$$prog /bin/$$prog" $@ > /dev/null 2>&1; \
+	done
+
+$(HOME_IMG): | dirs
+	@echo " [HOME]  Checking Home Filesystem..."
+	
+	@if [ -f $(DISK_IMG) ]; then \
+		echo "         -> Extracting HomeFS from disk.img (Preserving Data)..."; \
+		$(DD) if=$(DISK_IMG) of=$@ bs=512 skip=$(HOME_OFFSET) count=$(HOME_SECTORS); \
+	elif [ ! -f $@ ]; then \
+		echo "         -> Creating new HomeFS (Format)..."; \
+		$(DD) if=/dev/zero of=$@ bs=1M count=$(HOME_SIZE_MB); \
+		mkfs.ext4 -q -O ^64bit,^metadata_csum $@; \
+	else \
+		echo "         -> Using existing homefs.img"; \
+	fi
+
+
+$(DISK_IMG): $(ROOT_IMG) $(HOME_IMG) $(CORE_IMG)
+	@echo " [ASM]   Assembling disk with partitions..."
+	@$(DD) if=/dev/zero of=$@ bs=1M count=$(DISK_SIZE_MB)
+	
+	@echo "start=$(ROOT_OFFSET), size=$(ROOT_SECTORS), type=83, bootable" > partition.script
+	@echo "start=$(HOME_OFFSET), size=$(HOME_SECTORS), type=83" >> partition.script
+	@sfdisk $@ < partition.script > /dev/null 2>&1
+	@rm partition.script
+
+	@echo "         -> Writing RootFS (p1)..."
+	@$(DD) if=$(ROOT_IMG) of=$@ bs=512 seek=$(ROOT_OFFSET) conv=notrunc
+	
+	@echo "         -> Writing HomeFS (p2)..."
+	@$(DD) if=$(HOME_IMG) of=$@ bs=512 seek=$(HOME_OFFSET) conv=notrunc
+	
+	@echo "         -> Installing GRUB..."
+	@$(DD) if=$(GRUB_LIB)/boot.img of=$@ bs=446 count=1 conv=notrunc
+	@$(DD) if=$(CORE_IMG) of=$@ bs=512 seek=1 conv=notrunc
+
+# $(DISK_IMG): $(PART_IMG) $(CORE_IMG)
+# 	@echo " [ASM]   Assembling disk..."
+# 	@$(DD) if=/dev/zero of=$@ bs=1M count=$(DISK_SIZE_MB)
+# 	@echo "2048,,83,*" | sfdisk $@ > /dev/null 2>&1
+# 	@$(DD) if=$(PART_IMG) of=$@ bs=512 seek=$(SECTOR_OFF) conv=notrunc
+# 	@$(DD) if=$(GRUB_LIB)/boot.img of=$@ bs=446 count=1 conv=notrunc
+# 	@$(DD) if=$(CORE_IMG) of=$@ bs=512 seek=1 conv=notrunc