arch/arm64/Makefile

   1 #
   2 # arch/arm64/Makefile
   3 #
   4 # This file is included by the global makefile so that you can add your own
   5 # architecture-specific flags and dependencies.
   6 #
   7 # This file is subject to the terms and conditions of the GNU General Public
   8 # License.  See the file "COPYING" in the main directory of this archive
   9 # for more details.
  10 #
  11 # Copyright (C) 1995-2001 by Russell King
  12
  13 LDFLAGS_vmlinux :=-p --no-undefined -X
  14 CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
  15 GZFLAGS         :=-9
  16
  17 ifneq ($(CONFIG_RELOCATABLE),)
  18 LDFLAGS_vmlinux         += -pie -shared -Bsymbolic
  19 endif
  20
  21 ifeq ($(CONFIG_ARM64_ERRATUM_843419),y)
  22   ifeq ($(call ld-option, --fix-cortex-a53-843419),)
  23 $(warning ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum)
  24   else
  25 LDFLAGS_vmlinux += --fix-cortex-a53-843419
  26   endif
  27 endif
  28
  29 KBUILD_DEFCONFIG := defconfig
  30
  31 # Check for binutils support for specific extensions
  32 lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
  33
  34 ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
  35   ifeq ($(lseinstr),)
  36 $(warning LSE atomics not supported by binutils)
  37   endif
  38 endif
  39
  40 KBUILD_CFLAGS   += -mgeneral-regs-only $(lseinstr)
  41 KBUILD_CFLAGS   += -fno-asynchronous-unwind-tables
  42 KBUILD_CFLAGS   += $(call cc-option, -mpc-relative-literal-loads)
  43 KBUILD_AFLAGS   += $(lseinstr)
  44
  45 ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
  46 KBUILD_CPPFLAGS += -mbig-endian
  47 AS              += -EB
  48 LD              += -EB
  49 UTS_MACHINE     := aarch64_be
  50 else
  51 KBUILD_CPPFLAGS += -mlittle-endian
  52 AS              += -EL
  53 LD              += -EL
  54 UTS_MACHINE     := aarch64
  55 endif
  56
  57 CHECKFLAGS      += -D__aarch64__
  58
  59 ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
  60 KBUILD_CFLAGS_MODULE    += -mcmodel=large
  61 endif
  62
  63 ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
  64 KBUILD_LDFLAGS_MODULE   += -T $(srctree)/arch/arm64/kernel/module.lds
  65 endif
  66
  67 # Default value
  68 head-y          := arch/arm64/kernel/head.o
  69
  70 # The byte offset of the kernel image in RAM from the start of RAM.
  71 ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
  72 TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
  73                  int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
  74                  rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
  75 else
  76 TEXT_OFFSET := 0x00080000
  77 endif
  78
  79 # KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
  80 # in 32-bit arithmetic
  81 KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
  82                         (0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
  83                         + (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
  84                         - (1 << (64 - 32 - 3)) )) )
  85
  86 export  TEXT_OFFSET GZFLAGS
  87
  88 core-y          += arch/arm64/kernel/ arch/arm64/mm/
  89 core-$(CONFIG_NET) += arch/arm64/net/
  90 core-$(CONFIG_KVM) += arch/arm64/kvm/
  91 core-$(CONFIG_XEN) += arch/arm64/xen/
  92 core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
  93 libs-y          := arch/arm64/lib/ $(libs-y)
  94 core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
  95
  96 # Default target when executing plain make
  97 KBUILD_IMAGE    := Image.gz
  98 KBUILD_DTBS     := dtbs
  99
 100 all:    $(KBUILD_IMAGE) $(KBUILD_DTBS)
 101
 102 boot := arch/arm64/boot
 103
 104 Image: vmlinux
 105         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 106
 107 Image.%: Image
 108         $(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
 109
 110 zinstall install:
 111         $(Q)$(MAKE) $(build)=$(boot) $@
 112
 113 %.dtb: scripts
 114         $(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
 115
 116 PHONY += dtbs dtbs_install
 117
 118 dtbs: prepare scripts
 119         $(Q)$(MAKE) $(build)=$(boot)/dts
 120
 121 dtbs_install:
 122         $(Q)$(MAKE) $(dtbinst)=$(boot)/dts
 123
 124 PHONY += vdso_install
 125 vdso_install:
 126         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
 127
 128 # We use MRPROPER_FILES and CLEAN_FILES now
 129 archclean:
 130         $(Q)$(MAKE) $(clean)=$(boot)
 131         $(Q)$(MAKE) $(clean)=$(boot)/dts
 132
 133 # We need to generate vdso-offsets.h before compiling certain files in kernel/.
 134 # In order to do that, we should use the archprepare target, but we can't since
 135 # asm-offsets.h is included in some files used to generate vdso-offsets.h, and
 136 # asm-offsets.h is built in prepare0, for which archprepare is a dependency.
 137 # Therefore we need to generate the header after prepare0 has been made, hence
 138 # this hack.
 139 prepare: vdso_prepare
 140 vdso_prepare: prepare0
 141         $(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
 142
 143 define archhelp
 144   echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
 145   echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
 146   echo  '* dtbs          - Build device tree blobs for enabled boards'
 147   echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
 148   echo  '  install       - Install uncompressed kernel'
 149   echo  '  zinstall      - Install compressed kernel'
 150   echo  '                  Install using (your) ~/bin/installkernel or'
 151   echo  '                  (distribution) /sbin/installkernel or'
 152   echo  '                  install to $$(INSTALL_PATH) and run lilo'
 153 endef