xref: /openbmc/linux/arch/x86/Makefile (revision 82ced6fd) 
1# Unified Makefile for i386 and x86_64
2
3# select defconfig based on actual architecture
4ifeq ($(ARCH),x86)
5        KBUILD_DEFCONFIG := i386_defconfig
6else
7        KBUILD_DEFCONFIG := $(ARCH)_defconfig
8endif
9
10core-$(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_$(BITS).o
15export BITS
16
17ifeq ($(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 += $(cflags-y)
43
44        # temporary until string.h is fixed
45        KBUILD_CFLAGS += -ffreestanding
46else
47        BITS := 64
48        UTS_MACHINE := x86_64
49        CHECKFLAGS += -D__x86_64__ -m64
50
51        KBUILD_AFLAGS += -m64
52        KBUILD_CFLAGS += -m64
53
54        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
55        cflags-$(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
73endif
74
75ifdef 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                $(warning stack protector enabled but no compiler support)
83        endif
84endif
85
86# Stackpointer is addressed different for 32 bit and 64 bit x86
87sp-$(CONFIG_X86_32) := esp
88sp-$(CONFIG_X86_64) := rsp
89
90# do binutils support CFI?
91cfi := $(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?
93cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
94KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
95KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
96
97LDFLAGS := -m elf_$(UTS_MACHINE)
98
99# Speed up the build
100KBUILD_CFLAGS += -pipe
101# Workaround for a gcc prelease that unfortunately was shipped in a suse release
102KBUILD_CFLAGS += -Wno-sign-compare
103#
104KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
105# prevent gcc from generating any FP code by mistake
106KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
107
108KBUILD_CFLAGS += $(mflags-y)
109KBUILD_AFLAGS += $(mflags-y)
110
111###
112# Kernel objects
113
114head-y := arch/x86/kernel/head_$(BITS).o
115head-y += arch/x86/kernel/head$(BITS).o
116head-y += arch/x86/kernel/head.o
117head-y += arch/x86/kernel/init_task.o
118
119libs-y  += arch/x86/lib/
120
121# Sub architecture files that needs linking first
122core-y += $(fcore-y)
123
124# Xen paravirtualization support
125core-$(CONFIG_XEN) += arch/x86/xen/
126
127# lguest paravirtualization support
128core-$(CONFIG_LGUEST_GUEST) += arch/x86/lguest/
129
130core-y += arch/x86/kernel/
131core-y += arch/x86/mm/
132
133core-y += arch/x86/crypto/
134core-y += arch/x86/vdso/
135core-$(CONFIG_IA32_EMULATION) += arch/x86/ia32/
136
137# drivers-y are linked after core-y
138drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
139drivers-$(CONFIG_PCI)            += arch/x86/pci/
140
141# must be linked after kernel/
142drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
143
144# suspend and hibernation support
145drivers-$(CONFIG_PM) += arch/x86/power/
146
147ifeq ($(CONFIG_X86_32),y)
148drivers-$(CONFIG_FB) += arch/x86/video/
149endif
150
151####
152# boot loader support. Several targets are kept for legacy purposes
153
154boot := arch/x86/boot
155
156BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
157
158PHONY += bzImage $(BOOT_TARGETS)
159
160# Default kernel to build
161all: bzImage
162
163# KBUILD_IMAGE specify target image being built
164KBUILD_IMAGE := $(boot)/bzImage
165
166bzImage: 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
174PHONY += install
175install:
176	$(Q)$(MAKE) $(build)=$(boot) $@
177
178PHONY += vdso_install
179vdso_install:
180	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
181
182archclean:
183	$(Q)rm -rf $(objtree)/arch/i386
184	$(Q)rm -rf $(objtree)/arch/x86_64
185	$(Q)$(MAKE) $(clean)=$(boot)
186
187define archhelp
188  echo  '* bzImage      - Compressed kernel image (arch/x86/boot/bzImage)'
189  echo  '  install      - Install kernel using'
190  echo  '                  (your) ~/bin/installkernel or'
191  echo  '                  (distribution) /sbin/installkernel or'
192  echo  '                  install to $$(INSTALL_PATH) and run lilo'
193  echo  '  fdimage      - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
194  echo  '  fdimage144   - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
195  echo  '  fdimage288   - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
196  echo  '  isoimage     - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
197  echo  '                  bzdisk/fdimage*/isoimage also accept:'
198  echo  '                  FDARGS="..."  arguments for the booted kernel'
199  echo  '                  FDINITRD=file initrd for the booted kernel'
200endef
201