1. 根目录:
2. arch
3. mips
4. boot
5. compressed
6. Makefile

#
# This file is subject to the terms and conditions of the GNU General Public
# License.
#
# Adapted for MIPS Pete Popov, Dan Malek
#
# Copyright (C) 1994 by Linus Torvalds
# Adapted for PowerPC by Gary Thomas
# modified by Cort (cort@cs.nmt.edu)
#
# Copyright (C) 2009 Lemote Inc. & DSLab, Lanzhou University
# Author: Wu Zhangjin <wuzhangjin@gmail.com>
#

# set the default size of the mallocing area for decompressing
BOOT_HEAP_SIZE := 0x400000

# Disable Function Tracer
KBUILD_CFLAGS := $(shell echo $(KBUILD_CFLAGS) | sed -e "s/-pg//")

KBUILD_CFLAGS := $(LINUXINCLUDE) $(KBUILD_CFLAGS) -D__KERNEL__ \
	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) -D"VMLINUX_LOAD_ADDRESS_ULL=$(VMLINUX_LOAD_ADDRESS)ull"

KBUILD_AFLAGS := $(LINUXINCLUDE) $(KBUILD_AFLAGS) -D__ASSEMBLY__ \
	-DBOOT_HEAP_SIZE=$(BOOT_HEAP_SIZE) \
	-DKERNEL_ENTRY=0x$(shell $(NM) $(objtree)/$(KBUILD_IMAGE) 2>/dev/null | grep " kernel_entry" | cut -f1 -d \ )

targets := head.o decompress.o dbg.o uart-16550.o uart-alchemy.o

# decompressor objects (linked with vmlinuz)
vmlinuzobjs-y := $(obj)/head.o $(obj)/decompress.o $(obj)/dbg.o

ifdef CONFIG_DEBUG_ZBOOT
vmlinuzobjs-$(CONFIG_SYS_SUPPORTS_ZBOOT_UART16550) += $(obj)/uart-16550.o
vmlinuzobjs-$(CONFIG_MIPS_ALCHEMY)		   += $(obj)/uart-alchemy.o
endif

targets += vmlinux.bin
OBJCOPYFLAGS_vmlinux.bin := $(OBJCOPYFLAGS) -O binary -R .comment -S
$(obj)/vmlinux.bin: $(KBUILD_IMAGE) FORCE
	$(call if_changed,objcopy)

tool_$(CONFIG_KERNEL_GZIP)    = gzip
tool_$(CONFIG_KERNEL_BZIP2)   = bzip2
tool_$(CONFIG_KERNEL_LZMA)    = lzma
tool_$(CONFIG_KERNEL_LZO)     = lzo

targets += vmlinux.bin.z
$(obj)/vmlinux.bin.z: $(obj)/vmlinux.bin FORCE
	$(call if_changed,$(tool_y))

targets += piggy.o
OBJCOPYFLAGS_piggy.o := --add-section=.image=$(obj)/vmlinux.bin.z \
                        --set-section-flags=.image=contents,alloc,load,readonly,data
$(obj)/piggy.o: $(obj)/dummy.o $(obj)/vmlinux.bin.z FORCE
	$(call if_changed,objcopy)

# Calculate the load address of the compressed kernel image
hostprogs-y := calc_vmlinuz_load_addr

VMLINUZ_LOAD_ADDRESS = $(shell $(obj)/calc_vmlinuz_load_addr \
		$(obj)/vmlinux.bin $(VMLINUX_LOAD_ADDRESS))

vmlinuzobjs-y += $(obj)/piggy.o

quiet_cmd_zld = LD      $@
      cmd_zld = $(LD) $(LDFLAGS) -Ttext $(VMLINUZ_LOAD_ADDRESS) -T $< $(vmlinuzobjs-y) -o $@
quiet_cmd_strip = STRIP   $@
      cmd_strip = $(STRIP) -s $@
vmlinuz: $(src)/ld.script $(vmlinuzobjs-y) $(obj)/calc_vmlinuz_load_addr
	$(call cmd,zld)
	$(call cmd,strip)

#
# Some DECstations need all possible sections of an ECOFF executable
#
ifdef CONFIG_MACH_DECSTATION
  e2eflag := -a
endif

# elf2ecoff can only handle 32bit image
hostprogs-y += ../elf2ecoff

ifdef CONFIG_32BIT
	VMLINUZ = vmlinuz
else
	VMLINUZ = vmlinuz.32
endif

quiet_cmd_32 = OBJCOPY $@
      cmd_32 = $(OBJCOPY) -O $(32bit-bfd) $(OBJCOPYFLAGS) $< $@
vmlinuz.32: vmlinuz
	$(call cmd,32)

quiet_cmd_ecoff = ECOFF   $@
      cmd_ecoff = $< $(VMLINUZ) $@ $(e2eflag)
vmlinuz.ecoff: $(obj)/../elf2ecoff $(VMLINUZ)
	$(call cmd,ecoff)

OBJCOPYFLAGS_vmlinuz.bin := $(OBJCOPYFLAGS) -O binary
vmlinuz.bin: vmlinuz
	$(call cmd,objcopy)

OBJCOPYFLAGS_vmlinuz.srec := $(OBJCOPYFLAGS) -S -O srec
vmlinuz.srec: vmlinuz
	$(call cmd,objcopy)

clean-files := $(objtree)/vmlinuz $(objtree)/vmlinuz.{32,ecoff,bin,srec}