# Unified Makefile for i386 and x86_64

  # select defconfig based on actual architecture

  ifeq ($(ARCH),x86)
          KBUILD_DEFCONFIG := i386_defconfig
  else
          KBUILD_DEFCONFIG := $(ARCH)_defconfig
  endif

  # BITS is used as extension for files which are available in a 32 bit
  # and a 64 bit version to simplify shared Makefiles.
  # e.g.: obj-y += foo_$(BITS).o
  export BITS

  ifeq ($(CONFIG_X86_32),y)

          BITS := 32

          UTS_MACHINE := i386

          CHECKFLAGS += -D__i386__

          biarch := $(call cc-option,-m32)
          KBUILD_AFLAGS += $(biarch)
          KBUILD_CFLAGS += $(biarch)

  
          ifdef CONFIG_RELOCATABLE
                  LDFLAGS_vmlinux := --emit-relocs
          endif

  
          KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  
          # prevent gcc from keeping the stack 16 byte aligned
          KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  
          # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
          # a lot more stack due to the lack of sharing of stacklots:

          KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
  				$(call cc-option,-fno-unit-at-a-time))

  
          # CPU-specific tuning. Anything which can be shared with UML should go here.
          include $(srctree)/arch/x86/Makefile_32.cpu
          KBUILD_CFLAGS += $(cflags-y)
  
          # temporary until string.h is fixed
          KBUILD_CFLAGS += -ffreestanding

  else

          BITS := 64

          UTS_MACHINE := x86_64

          CHECKFLAGS += -D__x86_64__ -m64
  
          KBUILD_AFLAGS += -m64
          KBUILD_CFLAGS += -m64
  
          # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
          cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
          cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  
          cflags-$(CONFIG_MCORE2) += \
                  $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))

  	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
  		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))

          cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
          KBUILD_CFLAGS += $(cflags-y)
  
          KBUILD_CFLAGS += -mno-red-zone
          KBUILD_CFLAGS += -mcmodel=kernel

          # -funit-at-a-time shrinks the kernel .text considerably
          # unfortunately it makes reading oopses harder.
          KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)

          # this works around some issues with generating unwind tables in older gccs
          # newer gccs do it by default
          KBUILD_CFLAGS += -maccumulate-outgoing-args

  endif

  ifdef CONFIG_CC_STACKPROTECTOR
  	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh

          ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)

                  stackp-y := -fstack-protector

                  KBUILD_CFLAGS += $(stackp-y)
          else
                  $(warning stack protector enabled but no compiler support)
          endif

  endif

  # Don't unroll struct assignments with kmemcheck enabled
  ifeq ($(CONFIG_KMEMCHECK),y)
  	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
  endif

  # Stackpointer is addressed different for 32 bit and 64 bit x86
  sp-$(CONFIG_X86_32) := esp
  sp-$(CONFIG_X86_64) := rsp
  
  # do binutils support CFI?
  cfi := $(call as-instr,.cfi_startproc
  .cfi_rel_offset $(sp-y)$(comma)0
  .cfi_endproc,-DCONFIG_AS_CFI=1)
  # is .cfi_signal_frame supported too?
  cfi-sigframe := $(call as-instr,.cfi_startproc
  .cfi_signal_frame
  .cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)

  cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)

  
  # does binutils support specific instructions?
  asinstr := $(call as-instr,fxsaveq (%rax),-DCONFIG_AS_FXSAVEQ=1)
  
  KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)
  KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections) $(asinstr)

  
  LDFLAGS := -m elf_$(UTS_MACHINE)

  
  # Speed up the build

  KBUILD_CFLAGS += -pipe

  # Workaround for a gcc prelease that unfortunately was shipped in a suse release
  KBUILD_CFLAGS += -Wno-sign-compare
  #
  KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
  # prevent gcc from generating any FP code by mistake
  KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)

  KBUILD_CFLAGS += $(mflags-y)
  KBUILD_AFLAGS += $(mflags-y)
  
  ###

  # Syscall table generation
  
  archheaders:
  	$(Q)$(MAKE) $(build)=arch/x86/syscalls all
  
  ###

  # Kernel objects

  head-y := arch/x86/kernel/head_$(BITS).o
  head-y += arch/x86/kernel/head$(BITS).o

  head-y += arch/x86/kernel/head.o

  head-y += arch/x86/kernel/init_task.o

  
  libs-y  += arch/x86/lib/

  # See arch/x86/Kbuild for content of core part of the kernel
  core-y += arch/x86/

  
  # drivers-y are linked after core-y
  drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
  drivers-$(CONFIG_PCI)            += arch/x86/pci/
  
  # must be linked after kernel/
  drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/

  # suspend and hibernation support

  drivers-$(CONFIG_PM) += arch/x86/power/

  drivers-$(CONFIG_FB) += arch/x86/video/

  
  ####
  # boot loader support. Several targets are kept for legacy purposes
  
  boot := arch/x86/boot

  BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage

  
  PHONY += bzImage $(BOOT_TARGETS)

  
  # Default kernel to build
  all: bzImage
  
  # KBUILD_IMAGE specify target image being built

  KBUILD_IMAGE := $(boot)/bzImage

  bzImage: vmlinux

  ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
  	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
  endif

  	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
  	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot

  	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@

  $(BOOT_TARGETS): vmlinux
  	$(Q)$(MAKE) $(build)=$(boot) $@

  PHONY += install
  install:
  	$(Q)$(MAKE) $(build)=$(boot) $@

  PHONY += vdso_install
  vdso_install:
  	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
  
  archclean:
  	$(Q)rm -rf $(objtree)/arch/i386
  	$(Q)rm -rf $(objtree)/arch/x86_64
  	$(Q)$(MAKE) $(clean)=$(boot)
  
  define archhelp

    echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
    echo  '  install      - Install kernel using'

    echo  '                  (your) ~/bin/$(INSTALLKERNEL) or'
    echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'

    echo  '                  install to $$(INSTALL_PATH) and run lilo'
    echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
    echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
    echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
    echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
    echo  '                  bzdisk/fdimage*/isoimage also accept:'
    echo  '                  FDARGS="..."  arguments for the booted kernel'
    echo  '                  FDINITRD=file initrd for the booted kernel'

  endef