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 += $(cflags-y)
41
42        # temporary until string.h is fixed
43        KBUILD_CFLAGS += -ffreestanding
44else
45        BITS := 64
46        UTS_MACHINE := x86_64
47        CHECKFLAGS += -D__x86_64__ -m64
48
49        KBUILD_AFLAGS += -m64
50        KBUILD_CFLAGS += -m64
51
52        cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8)
53        cflags-$(CONFIG_MPSC) += $(call cc-option,-march=nocona)
54
55        cflags-$(CONFIG_MCORE2) += \
56                $(call cc-option,-march=core2,$(call cc-option,-mtune=generic))
57	cflags-$(CONFIG_MATOM) += $(call cc-option,-march=atom) \
58		$(call cc-option,-mtune=atom,$(call cc-option,-mtune=generic))
59        cflags-$(CONFIG_GENERIC_CPU) += $(call cc-option,-mtune=generic)
60        KBUILD_CFLAGS += $(cflags-y)
61
62        KBUILD_CFLAGS += -mno-red-zone
63        KBUILD_CFLAGS += -mcmodel=kernel
64
65        # -funit-at-a-time shrinks the kernel .text considerably
66        # unfortunately it makes reading oopses harder.
67        KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
68
69        # this works around some issues with generating unwind tables in older gccs
70        # newer gccs do it by default
71        KBUILD_CFLAGS += -maccumulate-outgoing-args
72endif
73
74ifdef CONFIG_CC_STACKPROTECTOR
75	cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
76        ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(KBUILD_CPPFLAGS) $(biarch)),y)
77                stackp-y := -fstack-protector
78                KBUILD_CFLAGS += $(stackp-y)
79        else
80                $(warning stack protector enabled but no compiler support)
81        endif
82endif
83
84# Don't unroll struct assignments with kmemcheck enabled
85ifeq ($(CONFIG_KMEMCHECK),y)
86	KBUILD_CFLAGS += $(call cc-option,-fno-builtin-memcpy)
87endif
88
89# Stackpointer is addressed different for 32 bit and 64 bit x86
90sp-$(CONFIG_X86_32) := esp
91sp-$(CONFIG_X86_64) := rsp
92
93# do binutils support CFI?
94cfi := $(call as-instr,.cfi_startproc\n.cfi_rel_offset $(sp-y)$(comma)0\n.cfi_endproc,-DCONFIG_AS_CFI=1)
95# is .cfi_signal_frame supported too?
96cfi-sigframe := $(call as-instr,.cfi_startproc\n.cfi_signal_frame\n.cfi_endproc,-DCONFIG_AS_CFI_SIGNAL_FRAME=1)
97cfi-sections := $(call as-instr,.cfi_sections .debug_frame,-DCONFIG_AS_CFI_SECTIONS=1)
98KBUILD_AFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
99KBUILD_CFLAGS += $(cfi) $(cfi-sigframe) $(cfi-sections)
100
101LDFLAGS := -m elf_$(UTS_MACHINE)
102
103# Speed up the build
104KBUILD_CFLAGS += -pipe
105KBUILD_CFLAGS += -Wno-sign-compare
106#
107KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
108# prevent gcc from generating any FP code by mistake
109KBUILD_CFLAGS += $(call cc-option,-mno-sse -mno-mmx -mno-sse2 -mno-3dnow,)
110
111KBUILD_CFLAGS += $(mflags-y)
112KBUILD_AFLAGS += $(mflags-y)
113
114###
115# Kernel objects
116
117head-y := arch/x86/kernel/head_$(BITS).o
118head-y += arch/x86/kernel/head$(BITS).o
119head-y += arch/x86/kernel/head.o
120head-y += arch/x86/kernel/init_task.o
121
122libs-y  += arch/x86/lib/
123
124# See arch/x86/Kbuild for content of core part of the kernel
125core-y += arch/x86/
126
127# drivers-y are linked after core-y
128drivers-$(CONFIG_MATH_EMULATION) += arch/x86/math-emu/
129drivers-$(CONFIG_PCI)            += arch/x86/pci/
130
131# must be linked after kernel/
132drivers-$(CONFIG_OPROFILE) += arch/x86/oprofile/
133
134# suspend and hibernation support
135drivers-$(CONFIG_PM) += arch/x86/power/
136
137drivers-$(CONFIG_FB) += arch/x86/video/
138
139####
140# boot loader support. Several targets are kept for legacy purposes
141
142boot := arch/x86/boot
143
144BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage
145
146PHONY += bzImage $(BOOT_TARGETS)
147
148# Default kernel to build
149all: bzImage
150
151# KBUILD_IMAGE specify target image being built
152KBUILD_IMAGE := $(boot)/bzImage
153
154bzImage: vmlinux
155ifeq ($(CONFIG_X86_DECODER_SELFTEST),y)
156	$(Q)$(MAKE) $(build)=arch/x86/tools posttest
157endif
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