Root/arch/x86/Makefile

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 := $(ARCH)_defconfig
8endif
9
10# BITS is used as extension for files which are available in a 32 bit
11# and a 64 bit version to simplify shared Makefiles.
12# e.g.: obj-y += foo_$(BITS).o
13export BITS
14
15ifeq ($(CONFIG_X86_32),y)
16        BITS := 32
17        UTS_MACHINE := i386
18        CHECKFLAGS += -D__i386__
19
20        biarch := $(call cc-option,-m32)
21        KBUILD_AFLAGS += $(biarch)
22        KBUILD_CFLAGS += $(biarch)
23
24        ifdef CONFIG_RELOCATABLE
25                LDFLAGS_vmlinux := --emit-relocs
26        endif
27
28        KBUILD_CFLAGS += -msoft-float -mregparm=3 -freg-struct-return
29
30        # prevent gcc from keeping the stack 16 byte aligned
31        KBUILD_CFLAGS += $(call cc-option,-mpreferred-stack-boundary=2)
32
33        # Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
34        # a lot more stack due to the lack of sharing of stacklots:
35        KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0400, \
36                $(call cc-option,-fno-unit-at-a-time))
37
38        # CPU-specific tuning. Anything which can be shared with UML should go here.
39        include $(srctree)/arch/x86/Makefile_32.cpu
40        KBUILD_CFLAGS += $(cflags-y)
41
42        # temporary until string.h is fixed
43        KBUILD_CFLAGS += -ffreestanding
44else
45        BITS := 64
46        UTS_MACHINE := x86_64
47        CHECKFLAGS += -D__x86_64__ -m64
48
49        KBUILD_AFLAGS += -m64
50        KBUILD_CFLAGS += -m64
51
52        # FIXME - should be integrated in Makefile.cpu (Makefile_32.cpu)
53        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
54        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
55
56        cflags-$(CONFIG_MCORE2) += \
57                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
58    cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
59        $(call cc-option,-mtune=atom,$(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) $(biarch)),y)
78                stackp-y := -fstack-protector
79                KBUILD_CFLAGS += $(stackp-y)
80        else
81                $(warning stack protector enabled but no compiler support)
82        endif
83endif
84
85# Don't unroll struct assignments with kmemcheck enabled
86ifeq ($(CONFIG_KMEMCHECK),y)
87    KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
88endif
89
90# Stackpointer is addressed different for 32 bit and 64 bit x86
91sp-$(CONFIG_X86_32) := esp
92sp-$(CONFIG_X86_64) := rsp
93
94# do binutils support CFI?
95cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
96# is .cfi_signal_frame supported too?
97cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
98KBUILD_AFLAGS += $(cfi) $(cfi-sigframe)
99KBUILD_CFLAGS += $(cfi) $(cfi-sigframe)
100
101LDFLAGS := -m elf_$(UTS_MACHINE)
102
103# Speed up the build
104KBUILD_CFLAGS += -pipe
105# Workaround for a gcc prelease that unfortunately was shipped in a suse release
106KBUILD_CFLAGS += -Wno-sign-compare
107#
108KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
109# prevent gcc from generating any FP code by mistake
110KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
111
112KBUILD_CFLAGS += $(mflags-y)
113KBUILD_AFLAGS += $(mflags-y)
114
115###
116# Kernel objects
117
118head-y := arch/x86/kernel/head_$(BITS).o
119head-y += arch/x86/kernel/head$(BITS).o
120head-y += arch/x86/kernel/head.o
121head-y += arch/x86/kernel/init_task.o
122
123libs-y += arch/x86/lib/
124
125# See arch/x86/Kbuild for content of core part of the kernel
126core-y += arch/x86/
127
128# drivers-y are linked after core-y
129drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
130drivers-$(CONFIG_PCI) += arch/x86/pci/
131
132# must be linked after kernel/
133drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
134
135# suspend and hibernation support
136drivers-$(CONFIG_PM) += arch/x86/power/
137
138ifeq ($(CONFIG_X86_32),y)
139drivers-$(CONFIG_FB) += arch/x86/video/
140endif
141
142####
143# boot loader support. Several targets are kept for legacy purposes
144
145boot := arch/x86/boot
146
147BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
148
149PHONY += bzImage $(BOOT_TARGETS)
150
151# Default kernel to build
152all: bzImage
153
154# KBUILD_IMAGE specify target image being built
155KBUILD_IMAGE := $(boot)/bzImage
156
157bzImage: vmlinux
158    $(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)
159    $(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot
160    $(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@
161
162$(BOOT_TARGETS): vmlinux
163    $(Q)$(MAKE) $(build)=$(boot) $@
164
165PHONY += install
166install:
167    $(Q)$(MAKE) $(build)=$(boot) $@
168
169PHONY += vdso_install
170vdso_install:
171    $(Q)$(MAKE) $(build)=arch/x86/vdso $@
172
173archclean:
174    $(Q)rm -rf $(objtree)/arch/i386
175    $(Q)rm -rf $(objtree)/arch/x86_64
176    $(Q)$(MAKE) $(clean)=$(boot)
177
178define archhelp
179  echo '* bzImage - Compressed kernel image (arch/x86/boot/bzImage)'
180  echo ' install - Install kernel using'
181  echo ' (your) ~/bin/$(INSTALLKERNEL) or'
182  echo ' (distribution) /sbin/$(INSTALLKERNEL) or'
183  echo ' install to $$(INSTALL_PATH) and run lilo'
184  echo ' fdimage - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
185  echo ' fdimage144 - Create 1.4MB boot floppy image (arch/x86/boot/fdimage)'
186  echo ' fdimage288 - Create 2.8MB boot floppy image (arch/x86/boot/fdimage)'
187  echo ' isoimage - Create a boot CD-ROM image (arch/x86/boot/image.iso)'
188  echo ' bzdisk/fdimage*/isoimage also accept:'
189  echo ' FDARGS="..." arguments for the booted kernel'
190  echo ' FDINITRD=file initrd for the booted kernel'
191endef
192

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