xref: /openbmc/linux/arch/arm64/Makefile (revision bc5aa3a0) 
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
13LDFLAGS_vmlinux	:=-p --no-undefined -X
14CPPFLAGS_vmlinux.lds = -DTEXT_OFFSET=$(TEXT_OFFSET)
15GZFLAGS		:=-9
16
17ifneq ($(CONFIG_RELOCATABLE),)
18LDFLAGS_vmlinux		+= -pie -Bsymbolic
19endif
20
21KBUILD_DEFCONFIG := defconfig
22
23# Check for binutils support for specific extensions
24lseinstr := $(call as-instr,.arch_extension lse,-DCONFIG_AS_LSE=1)
25
26ifeq ($(CONFIG_ARM64_LSE_ATOMICS), y)
27  ifeq ($(lseinstr),)
28$(warning LSE atomics not supported by binutils)
29  endif
30endif
31
32KBUILD_CFLAGS	+= -mgeneral-regs-only $(lseinstr)
33KBUILD_CFLAGS	+= -fno-asynchronous-unwind-tables
34KBUILD_CFLAGS	+= $(call cc-option, -mpc-relative-literal-loads)
35KBUILD_AFLAGS	+= $(lseinstr)
36
37ifeq ($(CONFIG_CPU_BIG_ENDIAN), y)
38KBUILD_CPPFLAGS	+= -mbig-endian
39AS		+= -EB
40LD		+= -EB
41else
42KBUILD_CPPFLAGS	+= -mlittle-endian
43AS		+= -EL
44LD		+= -EL
45endif
46
47CHECKFLAGS	+= -D__aarch64__
48
49ifeq ($(CONFIG_ARM64_MODULE_CMODEL_LARGE), y)
50KBUILD_CFLAGS_MODULE	+= -mcmodel=large
51endif
52
53ifeq ($(CONFIG_ARM64_MODULE_PLTS),y)
54KBUILD_LDFLAGS_MODULE	+= -T $(srctree)/arch/arm64/kernel/module.lds
55endif
56
57# Default value
58head-y		:= arch/arm64/kernel/head.o
59
60# The byte offset of the kernel image in RAM from the start of RAM.
61ifeq ($(CONFIG_ARM64_RANDOMIZE_TEXT_OFFSET), y)
62TEXT_OFFSET := $(shell awk "BEGIN {srand(); printf \"0x%06x\n\", \
63		 int(2 * 1024 * 1024 / (2 ^ $(CONFIG_ARM64_PAGE_SHIFT)) * \
64		 rand()) * (2 ^ $(CONFIG_ARM64_PAGE_SHIFT))}")
65else
66TEXT_OFFSET := 0x00080000
67endif
68
69# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - 3)) - (1 << 61)
70# in 32-bit arithmetic
71KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
72			(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
73			+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - 3)) \
74			- (1 << (64 - 32 - 3)) )) )
75
76export	TEXT_OFFSET GZFLAGS
77
78core-y		+= arch/arm64/kernel/ arch/arm64/mm/
79core-$(CONFIG_NET) += arch/arm64/net/
80core-$(CONFIG_KVM) += arch/arm64/kvm/
81core-$(CONFIG_XEN) += arch/arm64/xen/
82core-$(CONFIG_CRYPTO) += arch/arm64/crypto/
83libs-y		:= arch/arm64/lib/ $(libs-y)
84core-$(CONFIG_EFI_STUB) += $(objtree)/drivers/firmware/efi/libstub/lib.a
85
86# Default target when executing plain make
87KBUILD_IMAGE	:= Image.gz
88KBUILD_DTBS	:= dtbs
89
90all:	$(KBUILD_IMAGE) $(KBUILD_DTBS)
91
92boot := arch/arm64/boot
93
94Image: vmlinux
95	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
96
97Image.%: Image
98	$(Q)$(MAKE) $(build)=$(boot) $(boot)/$@
99
100zinstall install:
101	$(Q)$(MAKE) $(build)=$(boot) $@
102
103%.dtb: scripts
104	$(Q)$(MAKE) $(build)=$(boot)/dts $(boot)/dts/$@
105
106PHONY += dtbs dtbs_install
107
108dtbs: prepare scripts
109	$(Q)$(MAKE) $(build)=$(boot)/dts
110
111dtbs_install:
112	$(Q)$(MAKE) $(dtbinst)=$(boot)/dts
113
114PHONY += vdso_install
115vdso_install:
116	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso $@
117
118# We use MRPROPER_FILES and CLEAN_FILES now
119archclean:
120	$(Q)$(MAKE) $(clean)=$(boot)
121	$(Q)$(MAKE) $(clean)=$(boot)/dts
122
123# We need to generate vdso-offsets.h before compiling certain files in kernel/.
124# In order to do that, we should use the archprepare target, but we can't since
125# asm-offsets.h is included in some files used to generate vdso-offsets.h, and
126# asm-offsets.h is built in prepare0, for which archprepare is a dependency.
127# Therefore we need to generate the header after prepare0 has been made, hence
128# this hack.
129prepare: vdso_prepare
130vdso_prepare: prepare0
131	$(Q)$(MAKE) $(build)=arch/arm64/kernel/vdso include/generated/vdso-offsets.h
132
133define archhelp
134  echo  '* Image.gz      - Compressed kernel image (arch/$(ARCH)/boot/Image.gz)'
135  echo  '  Image         - Uncompressed kernel image (arch/$(ARCH)/boot/Image)'
136  echo  '* dtbs          - Build device tree blobs for enabled boards'
137  echo  '  dtbs_install  - Install dtbs to $(INSTALL_DTBS_PATH)'
138  echo  '  install       - Install uncompressed kernel'
139  echo  '  zinstall      - Install compressed kernel'
140  echo  '                  Install using (your) ~/bin/installkernel or'
141  echo  '                  (distribution) /sbin/installkernel or'
142  echo  '                  install to $$(INSTALL_PATH) and run lilo'
143endef
144