1SUBDIR_ROOTS := . 2DIRS := . $(shell find $(SUBDIR_ROOTS) -type d) 3GARBAGE_PATTERNS := *.o *.s~ *.s *.S~ *.c~ *.h~ kernel 4GARBAGE := $(foreach DIR,$(DIRS),$(addprefix $(DIR)/,$(GARBAGE_PATTERNS))) 5 6DIR_LIB=lib 7lib_patterns := *.a 8LIB_FILES := $(foreach DIR,$(DIR_LIB),$(addprefix $(DIR)/,$(lib_patterns))) 9 10 11# 控制操作系统使用的中断控制器 _INTR_8259A_ _INTR_APIC_ 12PIC := _INTR_APIC_ 13CFLAGS = $(GLOBAL_CFLAGS) -D $(PIC) -I $(shell pwd) 14 15export ASFLAGS := --64 16 17LD_LIST := head.o 18 19 20kernel_subdirs := common driver process debug filesystem time arch exception mm smp sched syscall ktest 21 22 23 24head.o: head.S 25 gcc -E head.S > head.s # 预处理 26 as $(ASFLAGS) -o head.o head.s 27 28 29main.o: main.c 30# -fno-builtin: 不使用C语言内建函数 31# The -m64 option sets int to 32bits and long and pointer to 64 bits and generates code for AMD’s x86-64 architecture. 32 gcc $(CFLAGS) -c main.c -o main.o 33 34 35all: kernel 36 @echo "Linking kernel..." 37 ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") -T link.lds 38# 生成kallsyms 39 current_dir=$(pwd) 40 41 @dbg='debug';for x in $$dbg; do \ 42 cd $$x;\ 43 $(MAKE) generate_kallsyms kernel_root_path="$(shell pwd)";\ 44 cd ..;\ 45 done 46 47# 重新链接 48 @echo "Re-Linking kernel..." 49 ld -b elf64-x86-64 -z muldefs -o kernel head.o main.o $(shell find . -name "*.o") ./debug/kallsyms.o -T link.lds 50 @echo "Generating kernel ELF file..." 51# 生成内核文件 52 objcopy -I elf64-x86-64 -O elf64-x86-64 -R ".comment" -R ".eh_frame" kernel ../bin/kernel/kernel.elf 53 @echo "Done." 54 55ECHO: 56 @echo "$@" 57 58$(kernel_subdirs): ECHO 59 60 $(MAKE) -C $@ all CFLAGS="$(CFLAGS)" ASFLAGS="$(ASFLAGS)" PIC="$(PIC)" kernel_root_path="$(shell pwd)" 61 62 63kernel: head.o main.o $(kernel_subdirs) 64 65 66 67clean: 68 rm -rf $(GARBAGE) 69 @list='$(kernel_subdirs)'; for subdir in $$list; do \ 70 echo "Clean in dir: $$subdir";\ 71 cd $$subdir && $(MAKE) clean;\ 72 cd .. ;\ 73 done