Handout

Makefile

@@ -0,0 +1,62 @@
+# Kernel Makefile
+# try `make help` for more information
+echo=$(shell which echo) -e
+
+# Default target
+.DEFAULT_GOAL = all
+
+# Path to the files for the initial ramdisk (for Assignment 7)
+INITRD_DIR ?= initrd/
+INITRD_TOOL ?= fs/tool/fstool
+INITRD_DEP =
+# 1MB free space
+INITRD_FREE ?= 1048576
+
+# Kernel source files
+LINKER_SCRIPT = compiler/sections.ld
+CC_SOURCES = $(shell find * -name "*.cc" -a ! -name '.*' -a ! -path 'test*' -a ! -path 'fs/tool/*' -a ! -path 'assets/*' -a ! -path 'tools/*')
+ASM_SOURCES = $(shell find * -name "*.asm"  -a ! -name '.*')
+
+# Target files
+KERNEL = $(BUILDDIR)/system
+KERNEL64 = $(KERNEL)64
+ISOFILE = $(BUILDDIR)/stubs.iso
+KERNEL_LINK = $(ROOTBUILDDIR)/system.img
+
+# Include global variables and standard recipes
+include tools/common.mk
+
+# Initial Ramdisk
+ifneq ($(wildcard $(INITRD_DIR)*),)
+INITRD = $(BUILDDIR)/initrd.img
+INITRD_DEP += $(shell find $(INITRD_DIR) -type f )
+# Additional dependency for kernel
+$(KERNEL): $(INITRD)
+endif
+
+all: $(KERNEL)
+
+# Linking the system image
+# We use the C++ compiler (which calls the actual linker)
+$(KERNEL64): $(ASM_OBJECTS) $(CC_OBJECTS) $(LINKER_SCRIPT) $(MAKEFILE_LIST)
+	@echo "LD		$@"
+	@mkdir -p $(@D)
+	$(VERBOSE) $(CXX) $(CXXFLAGS) -Wl,-T $(LINKER_SCRIPT) -o $@ $(LDFLAGS) $(ASM_OBJECTS) $(CC_OBJECTS)
+	@echo "LN		$(KERNEL_LINK)"
+	$(VERBOSE) ln -sf $(@:$(ROOTBUILDDIR)/%=%) "$(KERNEL_LINK)"
+
+# The kernel must be a 32bit elf for multiboot compliance
+$(KERNEL): $(KERNEL64)
+	$(VERBOSE) $(OBJCOPY) -I elf64-x86-64 -O elf32-i386 $< $@
+
+# Tool for editing a Minix v3 file system image (Assignment 7)
+$(INITRD_TOOL): $(shell test -d $(dir $(INITRD_TOOL)) && find $(dir $(INITRD_TOOL)) -name "*.cc" -or -name '*.h')
+	@echo "Make		$@"
+	@make -C $(dir $(INITRD_TOOL))
+
+# Initial Ramdisk with Minix v3 file system
+$(INITRD): $(INITRD_TOOL) $(INITRD_DEP)
+	@echo "INITRD		$@"
+	@dd if=/dev/zero of=$@ bs=$(shell du -s $(INITRD_DIR) | cut -f1 | xargs expr $(INITRD_FREE) + ) count=1
+	@mkfs.minix -3 $@  # optional --inodes <number>
+	@./$(INITRD_TOOL) put "$(INITRD_DIR)" $@