arch/x86/Makefile

   1 # Unified Makefile for i386 and x86_64
   2
   3 # select defconfig based on actual architecture
   4 ifeq ($(ARCH),x86)
   5         KBUILD_DEFCONFIG := i386_defconfig
   6 else
   7         KBUILD_DEFCONFIG := $(ARCH)_defconfig
   8 endif
   9
  10 core-$(CONFIG_KVM) += arch/x86/kvm/
  11
  12 # BITS is used as extension for files which are available in a 32 bit
  13 # and a 64 bit version to simplify shared Makefiles.
  14 # e.g.: obj-y += foo_$(BITS).o
  15 export BITS
  16
  17 ifeq ($(CONFIG_X86_32),y)
  18         BITS := 32
  19         UTS_MACHINE := i386
  20         CHECKFLAGS += -D__i386__
  21
  22         biarch := $(call cc-option,-m32)
  23         KBUILD_AFLAGS += $(biarch)
  24         KBUILD_CFLAGS += $(biarch)
  25
  26         ifdef CONFIG_RELOCATABLE
  27                 LDFLAGS_vmlinux := --emit-relocs
  28         endif
  29
  30         KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
  31
  32         # prevent gcc from keeping the stack 16 byte aligned
  33         KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
  34
  35         # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
  36         # a lot more stack due to the lack of sharing of stacklots:
  37         KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
  38                 echo $(call cc-option,-fno-unit-at-a-time); fi ;)
  39
  40         # CPU-specific tuning. Anything which can be shared with UML should go here.
  41         include $(srctree)/arch/x86/Makefile_32.cpu
  42         KBUILD_CFLAGS += $(cflags-y)
  43
  44         # temporary until string.h is fixed
  45         KBUILD_CFLAGS += -ffreestanding
  46 else
  47         BITS := 64
  48         UTS_MACHINE := x86_64
  49         CHECKFLAGS += -D__x86_64__ -m64
  50
  51         KBUILD_AFLAGS += -m64
  52         KBUILD_CFLAGS += -m64
  53
  54         # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
  55         cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
  56         cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
  57
  58         cflags-$(CONFIG_MCORE2) += \
  59                 $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
  60         cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
  61         KBUILD_CFLAGS += $(cflags-y)
  62
  63         KBUILD_CFLAGS += -mno-red-zone
  64         KBUILD_CFLAGS += -mcmodel=kernel
  65
  66         # -funit-at-a-time shrinks the kernel .text considerably
  67         # unfortunately it makes reading oopses harder.
  68         KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
  69
  70         # this works around some issues with generating unwind tables in older gccs
  71         # newer gccs do it by default
  72         KBUILD_CFLAGS += -maccumulate-outgoing-args
  73 endif
  74
  75 ifdef CONFIG_CC_STACKPROTECTOR
  76         cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
  77         ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC)),y)
  78                 stackp-y := -fstack-protector
  79                 stackp-$(CONFIG_CC_STACKPROTECTOR_ALL) += -fstack-protector-all
  80                 KBUILD_CFLAGS += $(stackp-y)
  81         else
  82                 $(warning stack protector enabled but no compiler support)
  83         endif
  84 endif
  85
  86 # Stackpointer is addressed different for 32 bit and 64 bit x86
  87 sp-$(CONFIG_X86_32) := esp
  88 sp-$(CONFIG_X86_64) := rsp
  89
  90 # do binutils support CFI?
  91 cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
  92 # is .cfi_signal_frame supported too?
  93 cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
  94 KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
  95 KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
  96
  97 LDFLAGS := -m elf_$(UTS_MACHINE)
  98
  99 # Speed up the build
 100 KBUILD_CFLAGS += -pipe
 101 # Workaround for a gcc prelease that unfortunately was shipped in a suse release
 102 KBUILD_CFLAGS += -Wno-sign-compare
 103 #
 104 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 105 # prevent gcc from generating any FP code by mistake
 106 KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
 107
 108 KBUILD_CFLAGS += $(mflags-y)
 109 KBUILD_AFLAGS += $(mflags-y)
 110
 111 ###
 112 # Kernel objects
 113
 114 head-y := arch/x86/kernel/head_$(BITS).o
 115 head-y += arch/x86/kernel/head$(BITS).o
 116 head-y += arch/x86/kernel/head.o
 117 head-y += arch/x86/kernel/init_task.o
 118
 119 libs-y  += arch/x86/lib/
 120
 121 # Sub architecture files that needs linking first
 122 core-y += $(fcore-y)
 123
 124 # Xen paravirtualization support
 125 core-$(CONFIG_XEN) += arch/x86/xen/
 126
 127 # lguest paravirtualization support
 128 core-$(CONFIG_LGUEST_GUEST) += arch/x86/lguest/
 129
 130 core-y += arch/x86/kernel/
 131 core-y += arch/x86/mm/
 132
 133 core-y += arch/x86/crypto/
 134 core-y += arch/x86/vdso/
 135 core-$(CONFIG_IA32_EMULATION) += arch/x86/ia32/
 136
 137 # drivers-y are linked after core-y
 138 drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
 139 drivers-$(CONFIG_PCI)            += arch/x86/pci/
 140
 141 # must be linked after kernel/
 142 drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
 143
 144 # suspend and hibernation support
 145 drivers-$(CONFIG_PM) += arch/x86/power/
 146
 147 ifeq ($(CONFIG_X86_32),y)
 148 drivers-$(CONFIG_FB) += arch/x86/video/
 149 endif
 150
 151 ####
 152 # boot loader support. Several targets are kept for legacy purposes
 153
 154 boot := arch/x86/boot
 155
 156 BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage install
 157
 158 PHONY += bzImage $(BOOT_TARGETS)
 159
 160 # Default kernel to build
 161 all: bzImage
 162
 163 # KBUILD_IMAGE specify target image being built
 164 KBUILD_IMAGE := $(boot)/bzImage
 165
 166 bzImage: vmlinux
 167         $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
 168         $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
 169         $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
 170
 171 $(BOOT_TARGETS): vmlinux
 172         $(Q)$(MAKE) $(build)=$(boot) $@
 173
 174 PHONY += vdso_install
 175 vdso_install:
 176         $(Q)$(MAKE) $(build)=arch/x86/vdso $@
 177
 178 archclean:
 179         $(Q)rm -rf $(objtree)/arch/i386
 180         $(Q)rm -rf $(objtree)/arch/x86_64
 181         $(Q)$(MAKE) $(clean)=$(boot)
 182
 183 define archhelp
 184   echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
 185   echo  '  install      - Install kernel using'
 186   echo  '                  (your) ~/bin/installkernel or'
 187   echo  '                  (distribution) /sbin/installkernel or'
 188   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 189   echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 190   echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
 191   echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
 192   echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
 193   echo  '                  bzdisk/fdimage*/isoimage also accept:'
 194   echo  '                  FDARGS="..."  arguments for the booted kernel'
 195   echo  '                  FDINITRD=file initrd for the booted kernel'
 196 endef