[mirror_ubuntu-artful-kernel.git] / arch / x86_64 / Kconfig

#
# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
# Note: ISA is disabled and will hopefully never be enabled.
# If you managed to buy an ISA x86-64 box you'll have to fix all the
# ISA drivers you need yourself.
#

mainmenu "Linux Kernel Configuration"

config X86_64
	bool
	default y
	help
	  Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
	  classical 32-bit x86 architecture. For details see
	  <http://www.x86-64.org/>.

config 64BIT
	def_bool y

config X86
	bool
	default y

config MMU
	bool
	default y

config ISA
	bool

config SBUS
	bool

config RWSEM_GENERIC_SPINLOCK
	bool
	default y

config RWSEM_XCHGADD_ALGORITHM
	bool

config GENERIC_CALIBRATE_DELAY
	bool
	default y

config X86_CMPXCHG
	bool
	default y

config EARLY_PRINTK
	bool
	default y

config GENERIC_ISA_DMA
	bool
	default y

config GENERIC_IOMAP
	bool
	default y

source "init/Kconfig"


menu "Processor type and features"

choice
	prompt "Processor family"
	default MK8

config MK8
	bool "AMD-Opteron/Athlon64"
	help
	  Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.

config MPSC
       bool "Intel EM64T"
       help
	  Optimize for Intel Pentium 4 and Xeon CPUs with Intel
	  Extended Memory 64 Technology(EM64T). For details see
	  <http://www.intel.com/technology/64bitextensions/>.

config GENERIC_CPU
	bool "Generic-x86-64"
	help
	  Generic x86-64 CPU.

endchoice

#
# Define implied options from the CPU selection here
#
config X86_L1_CACHE_BYTES
	int
	default "128" if GENERIC_CPU || MPSC
	default "64" if MK8

config X86_L1_CACHE_SHIFT
	int
	default "7" if GENERIC_CPU || MPSC
	default "6" if MK8

config X86_TSC
	bool
	default y

config X86_GOOD_APIC
	bool
	default y

config MICROCODE
	tristate "/dev/cpu/microcode - Intel CPU microcode support"
	---help---
	  If you say Y here the 'File systems' section, you will be
	  able to update the microcode on Intel processors. You will
	  obviously need the actual microcode binary data itself which is
	  not shipped with the Linux kernel.

	  For latest news and information on obtaining all the required
	  ingredients for this driver, check:
	  <http://www.urbanmyth.org/microcode/>.

	  To compile this driver as a module, choose M here: the
	  module will be called microcode.
	  If you use modprobe or kmod you may also want to add the line
	  'alias char-major-10-184 microcode' to your /etc/modules.conf file.

config X86_MSR
	tristate "/dev/cpu/*/msr - Model-specific register support"
	help
	  This device gives privileged processes access to the x86
	  Model-Specific Registers (MSRs).  It is a character device with
	  major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
	  MSR accesses are directed to a specific CPU on multi-processor
	  systems.

config X86_CPUID
	tristate "/dev/cpu/*/cpuid - CPU information support"
	help
	  This device gives processes access to the x86 CPUID instruction to
	  be executed on a specific processor.  It is a character device
	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
	  /dev/cpu/31/cpuid.

# disable it for opteron optimized builds because it pulls in ACPI_BOOT
config X86_HT
	bool
	depends on SMP && !MK8
	default y

config MATH_EMULATION
	bool

config MCA
	bool

config EISA
	bool

config X86_IO_APIC
	bool
	default y

config X86_LOCAL_APIC
	bool
	default y

config MTRR
	bool "MTRR (Memory Type Range Register) support"
	---help---
	  On Intel P6 family processors (Pentium Pro, Pentium II and later)
	  the Memory Type Range Registers (MTRRs) may be used to control
	  processor access to memory ranges. This is most useful if you have
	  a video (VGA) card on a PCI or AGP bus. Enabling write-combining
	  allows bus write transfers to be combined into a larger transfer
	  before bursting over the PCI/AGP bus. This can increase performance
	  of image write operations 2.5 times or more. Saying Y here creates a
	  /proc/mtrr file which may be used to manipulate your processor's
	  MTRRs. Typically the X server should use this.

	  This code has a reasonably generic interface so that similar
	  control registers on other processors can be easily supported
	  as well.

	  Saying Y here also fixes a problem with buggy SMP BIOSes which only
	  set the MTRRs for the boot CPU and not for the secondary CPUs. This
	  can lead to all sorts of problems, so it's good to say Y here.

	  Just say Y here, all x86-64 machines support MTRRs.

	  See <file:Documentation/mtrr.txt> for more information.

config SMP
	bool "Symmetric multi-processing support"
	---help---
	  This enables support for systems with more than one CPU. If you have
	  a system with only one CPU, like most personal computers, say N. If
	  you have a system with more than one CPU, say Y.

	  If you say N here, the kernel will run on single and multiprocessor
	  machines, but will use only one CPU of a multiprocessor machine. If
	  you say Y here, the kernel will run on many, but not all,
	  singleprocessor machines. On a singleprocessor machine, the kernel
	  will run faster if you say N here.

	  If you don't know what to do here, say N.

config SCHED_SMT
	bool "SMT (Hyperthreading) scheduler support"
	depends on SMP
	default n
	help
	  SMT scheduler support improves the CPU scheduler's decision making
	  when dealing with Intel Pentium 4 chips with HyperThreading at a
	  cost of slightly increased overhead in some places. If unsure say
	  N here.

source "kernel/Kconfig.preempt"

config K8_NUMA
       bool "K8 NUMA support"
       select NUMA
       depends on SMP
       help
	  Enable NUMA (Non Unified Memory Architecture) support for
	  AMD Opteron Multiprocessor systems. The kernel will try to allocate
	  memory used by a CPU on the local memory controller of the CPU
	  and add some more NUMA awareness to the kernel.
	  This code is recommended on all multiprocessor Opteron systems
	  and normally doesn't hurt on others.

config NUMA_EMU
	bool "NUMA emulation support"
	select NUMA
	depends on SMP
	help
	  Enable NUMA emulation. A flat machine will be split
	  into virtual nodes when booted with "numa=fake=N", where N is the
	  number of nodes. This is only useful for debugging.

config ARCH_DISCONTIGMEM_ENABLE
       bool
       depends on NUMA
       default y

config NUMA
       bool
       default n

config ARCH_DISCONTIGMEM_ENABLE
	def_bool y
	depends on NUMA

config ARCH_DISCONTIGMEM_DEFAULT
	def_bool y
	depends on NUMA

config ARCH_SPARSEMEM_ENABLE
	def_bool y
	depends on NUMA

config ARCH_FLATMEM_ENABLE
	def_bool y
	depends on !NUMA

source "mm/Kconfig"

config HAVE_ARCH_EARLY_PFN_TO_NID
	def_bool y

config HAVE_DEC_LOCK
	bool
	depends on SMP
	default y

config NR_CPUS
	int "Maximum number of CPUs (2-256)"
	range 2 256
	depends on SMP
	default "8"
	help
	  This allows you to specify the maximum number of CPUs which this
	  kernel will support. Current maximum is 256 CPUs due to
	  APIC addressing limits. Less depending on the hardware.

	  This is purely to save memory - each supported CPU requires
	  memory in the static kernel configuration.

config HOTPLUG_CPU
	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
	depends on SMP && HOTPLUG && EXPERIMENTAL
	help
		Say Y here to experiment with turning CPUs off and on.  CPUs
		can be controlled through /sys/devices/system/cpu/cpu#.
		Say N if you want to disable CPU hotplug.


config HPET_TIMER
	bool
	default y
	help
	  Use the IA-PC HPET (High Precision Event Timer) to manage
	  time in preference to the PIT and RTC, if a HPET is
	  present.  The HPET provides a stable time base on SMP
	  systems, unlike the TSC, but it is more expensive to access,
	  as it is off-chip.  You can find the HPET spec at
	  <http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.

config X86_PM_TIMER
	bool "PM timer"
	depends on ACPI
	default y
	help
	  Support the ACPI PM timer for time keeping. This is slow,
	  but is useful on some chipsets without HPET on systems with more
	  than one CPU. On a single processor or single socket multi core
	  system it is normally not required.
	  When the PM timer is active 64bit vsyscalls are disabled
	  and should not be enabled (/proc/sys/kernel/vsyscall64 should
	  not be changed).
	  The kernel selects the PM timer only as a last resort, so it is
	  useful to enable just in case.

config HPET_EMULATE_RTC
	bool "Provide RTC interrupt"
	depends on HPET_TIMER && RTC=y

config GART_IOMMU
	bool "IOMMU support"
	depends on PCI
	help
	  Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
	  properly with 32-bit PCI devices that do not support DAC (Double Address
	  Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
	  Normally the kernel will take the right choice by itself.
	  If unsure, say Y.

# need this always enabled with GART_IOMMU for the VIA workaround
config SWIOTLB
       bool
       depends on GART_IOMMU
       default y

config DUMMY_IOMMU
	bool
	depends on !GART_IOMMU && !SWIOTLB
	default y
	help
	  Don't use IOMMU code. This will cause problems when you have more than 4GB
	  of memory and any 32-bit devices. Don't turn on unless you know what you
	  are doing.

config X86_MCE
	bool "Machine check support" if EMBEDDED
	default y
	help
	   Include a machine check error handler to report hardware errors.
	   This version will require the mcelog utility to decode some
	   machine check error logs. See
	   ftp://ftp.x86-64.org/pub/linux/tools/mcelog

config X86_MCE_INTEL
	bool "Intel MCE features"
	depends on X86_MCE && X86_LOCAL_APIC
	default y
	help
	   Additional support for intel specific MCE features such as
	   the thermal monitor.

config PHYSICAL_START
	hex "Physical address where the kernel is loaded" if EMBEDDED
	default "0x100000"
	help
	  This gives the physical address where the kernel is loaded.
	  Primarily used in the case of kexec on panic where the
	  fail safe kernel needs to run at a different address than
	  the panic-ed kernel.

	  Don't change this unless you know what you are doing.

config KEXEC
	bool "kexec system call (EXPERIMENTAL)"
	depends on EXPERIMENTAL
	help
	  kexec is a system call that implements the ability to shutdown your
	  current kernel, and to start another kernel.  It is like a reboot
	  but it is indepedent of the system firmware.   And like a reboot
	  you can start any kernel with it, not just Linux.

	  The name comes from the similiarity to the exec system call.

	  It is an ongoing process to be certain the hardware in a machine
	  is properly shutdown, so do not be surprised if this code does not
	  initially work for you.  It may help to enable device hotplugging
	  support.  As of this writing the exact hardware interface is
	  strongly in flux, so no good recommendation can be made.

config SECCOMP
	bool "Enable seccomp to safely compute untrusted bytecode"
	depends on PROC_FS
	default y
	help
	  This kernel feature is useful for number crunching applications
	  that may need to compute untrusted bytecode during their
	  execution. By using pipes or other transports made available to
	  the process as file descriptors supporting the read/write
	  syscalls, it's possible to isolate those applications in
	  their own address space using seccomp. Once seccomp is
	  enabled via /proc/<pid>/seccomp, it cannot be disabled
	  and the task is only allowed to execute a few safe syscalls
	  defined by each seccomp mode.

	  If unsure, say Y. Only embedded should say N here.

source kernel/Kconfig.hz

endmenu

#
# Use the generic interrupt handling code in kernel/irq/:
#
config GENERIC_HARDIRQS
	bool
	default y

config GENERIC_IRQ_PROBE
	bool
	default y

# we have no ISA slots, but we do have ISA-style DMA.
config ISA_DMA_API
	bool
	default y

menu "Power management options"

source kernel/power/Kconfig

source "drivers/acpi/Kconfig"

source "arch/x86_64/kernel/cpufreq/Kconfig"

endmenu

menu "Bus options (PCI etc.)"

config PCI
	bool "PCI support"

# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
config PCI_DIRECT
	bool
	depends on PCI
	default y

config PCI_MMCONFIG
	bool "Support mmconfig PCI config space access"
	depends on PCI && ACPI
	select ACPI_BOOT

config UNORDERED_IO
       bool "Unordered IO mapping access"
       depends on EXPERIMENTAL
       help
         Use unordered stores to access IO memory mappings in device drivers.
	 Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
	 work with this option, but it makes the drivers behave differently
	 from i386. Requires that the driver writer used memory barriers
	 properly.

source "drivers/pci/pcie/Kconfig"

source "drivers/pci/Kconfig"

source "drivers/pcmcia/Kconfig"

source "drivers/pci/hotplug/Kconfig"

endmenu


menu "Executable file formats / Emulations"

source "fs/Kconfig.binfmt"

config IA32_EMULATION
	bool "IA32 Emulation"
	help
	  Include code to run 32-bit programs under a 64-bit kernel. You should likely
	  turn this on, unless you're 100% sure that you don't have any 32-bit programs
	  left.

config IA32_AOUT
       bool "IA32 a.out support"
       depends on IA32_EMULATION
       help
         Support old a.out binaries in the 32bit emulation.

config COMPAT
	bool
	depends on IA32_EMULATION
	default y

config SYSVIPC_COMPAT
	bool
	depends on COMPAT && SYSVIPC
	default y

config UID16
	bool
	depends on IA32_EMULATION
	default y

endmenu

source "net/Kconfig"

source drivers/Kconfig

source "drivers/firmware/Kconfig"

source fs/Kconfig

source "arch/x86_64/oprofile/Kconfig"

source "arch/x86_64/Kconfig.debug"

source "security/Kconfig"

source "crypto/Kconfig"

source "lib/Kconfig"
Commit	Line	Data
1da177e4 LT	1	#
	2	# For a description of the syntax of this configuration file,
	3	# see Documentation/kbuild/kconfig-language.txt.
	4	#
	5	# Note: ISA is disabled and will hopefully never be enabled.
	6	# If you managed to buy an ISA x86-64 box you'll have to fix all the
	7	# ISA drivers you need yourself.
	8	#
	9
	10	mainmenu "Linux Kernel Configuration"
	11
	12	config X86_64
	13	bool
	14	default y
	15	help
	16	Port to the x86-64 architecture. x86-64 is a 64-bit extension to the
	17	classical 32-bit x86 architecture. For details see
	18	<http://www.x86-64.org/>.
	19
	20	config 64BIT
	21	def_bool y
	22
	23	config X86
	24	bool
	25	default y
	26
	27	config MMU
	28	bool
	29	default y
	30
	31	config ISA
	32	bool
	33
	34	config SBUS
	35	bool
	36
	37	config RWSEM_GENERIC_SPINLOCK
	38	bool
	39	default y
	40
	41	config RWSEM_XCHGADD_ALGORITHM
	42	bool
	43
	44	config GENERIC_CALIBRATE_DELAY
	45	bool
	46	default y
	47
	48	config X86_CMPXCHG
	49	bool
	50	default y
	51
	52	config EARLY_PRINTK
	53	bool
	54	default y
	55
	56	config GENERIC_ISA_DMA
	57	bool
	58	default y
	59
	60	config GENERIC_IOMAP
	61	bool
	62	default y
	63
	64	source "init/Kconfig"
65
66
67	menu "Processor type and features"
68
69	choice
70	prompt "Processor family"
71	default MK8
72
73	config MK8
74	bool "AMD-Opteron/Athlon64"
75	help
76	Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs.
77
78	config MPSC
79	bool "Intel EM64T"
80	help
81	Optimize for Intel Pentium 4 and Xeon CPUs with Intel
82	Extended Memory 64 Technology(EM64T). For details see
83	<http://www.intel.com/technology/64bitextensions/>.
84
85	config GENERIC_CPU
86	bool "Generic-x86-64"
87	help
88	Generic x86-64 CPU.
89
90	endchoice
91
92	#
93	# Define implied options from the CPU selection here
94	#
95	config X86_L1_CACHE_BYTES
96	int
97	default "128" if GENERIC_CPU \|\| MPSC
98	default "64" if MK8
99
100	config X86_L1_CACHE_SHIFT
101	int
102	default "7" if GENERIC_CPU \|\| MPSC
103	default "6" if MK8
104
105	config X86_TSC
106	bool
107	default y
108
109	config X86_GOOD_APIC
110	bool
111	default y
112
113	config MICROCODE
114	tristate "/dev/cpu/microcode - Intel CPU microcode support"
115	---help---
116	If you say Y here the 'File systems' section, you will be
117	able to update the microcode on Intel processors. You will
118	obviously need the actual microcode binary data itself which is
119	not shipped with the Linux kernel.
120
121	For latest news and information on obtaining all the required
122	ingredients for this driver, check:
123	<http://www.urbanmyth.org/microcode/>.
124
125	To compile this driver as a module, choose M here: the
126	module will be called microcode.
127	If you use modprobe or kmod you may also want to add the line
128	'alias char-major-10-184 microcode' to your /etc/modules.conf file.
129
130	config X86_MSR
131	tristate "/dev/cpu/*/msr - Model-specific register support"
132	help
133	This device gives privileged processes access to the x86
134	Model-Specific Registers (MSRs). It is a character device with
135	major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr.
136	MSR accesses are directed to a specific CPU on multi-processor
137	systems.
138
139	config X86_CPUID
140	tristate "/dev/cpu/*/cpuid - CPU information support"
141	help
142	This device gives processes access to the x86 CPUID instruction to
143	be executed on a specific processor. It is a character device
144	with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to
145	/dev/cpu/31/cpuid.
146
147	# disable it for opteron optimized builds because it pulls in ACPI_BOOT
148	config X86_HT
149	bool
150	depends on SMP && !MK8
151	default y
152
153	config MATH_EMULATION
154	bool
155
156	config MCA
157	bool
158
159	config EISA
160	bool
161
162	config X86_IO_APIC
163	bool
164	default y
165
166	config X86_LOCAL_APIC
167	bool
168	default y
169
170	config MTRR
171	bool "MTRR (Memory Type Range Register) support"
172	---help---
173	On Intel P6 family processors (Pentium Pro, Pentium II and later)
174	the Memory Type Range Registers (MTRRs) may be used to control
175	processor access to memory ranges. This is most useful if you have
176	a video (VGA) card on a PCI or AGP bus. Enabling write-combining
177	allows bus write transfers to be combined into a larger transfer
178	before bursting over the PCI/AGP bus. This can increase performance
179	of image write operations 2.5 times or more. Saying Y here creates a
180	/proc/mtrr file which may be used to manipulate your processor's
181	MTRRs. Typically the X server should use this.
182
183	This code has a reasonably generic interface so that similar
184	control registers on other processors can be easily supported
185	as well.
186
187	Saying Y here also fixes a problem with buggy SMP BIOSes which only
188	set the MTRRs for the boot CPU and not for the secondary CPUs. This
189	can lead to all sorts of problems, so it's good to say Y here.
190
191	Just say Y here, all x86-64 machines support MTRRs.
192
193	See <file:Documentation/mtrr.txt> for more information.
194
195	config SMP
196	bool "Symmetric multi-processing support"
197	---help---
198	This enables support for systems with more than one CPU. If you have
199	a system with only one CPU, like most personal computers, say N. If
200	you have a system with more than one CPU, say Y.
201
202	If you say N here, the kernel will run on single and multiprocessor
203	machines, but will use only one CPU of a multiprocessor machine. If
204	you say Y here, the kernel will run on many, but not all,
205	singleprocessor machines. On a singleprocessor machine, the kernel
206	will run faster if you say N here.
207
208	If you don't know what to do here, say N.
209
1da177e4 LT	210	config SCHED_SMT
	211	bool "SMT (Hyperthreading) scheduler support"
	212	depends on SMP
	213	default n
	214	help
	215	SMT scheduler support improves the CPU scheduler's decision making
	216	when dealing with Intel Pentium 4 chips with HyperThreading at a
	217	cost of slightly increased overhead in some places. If unsure say
	218	N here.
	219
cc19ca86 IM	220	source "kernel/Kconfig.preempt"
cc19ca86 IM	221
1da177e4 LT	222	config K8_NUMA
	223	bool "K8 NUMA support"
	224	select NUMA
	225	depends on SMP
	226	help
	227	Enable NUMA (Non Unified Memory Architecture) support for
	228	AMD Opteron Multiprocessor systems. The kernel will try to allocate
	229	memory used by a CPU on the local memory controller of the CPU
	230	and add some more NUMA awareness to the kernel.
	231	This code is recommended on all multiprocessor Opteron systems
	232	and normally doesn't hurt on others.
	233
	234	config NUMA_EMU
	235	bool "NUMA emulation support"
	236	select NUMA
	237	depends on SMP
	238	help
	239	Enable NUMA emulation. A flat machine will be split
	240	into virtual nodes when booted with "numa=fake=N", where N is the
	241	number of nodes. This is only useful for debugging.
	242
3f22ab27	243	config ARCH_DISCONTIGMEM_ENABLE
1da177e4 LT	244	bool
	245	depends on NUMA
	246	default y
	247
	248	config NUMA
	249	bool
	250	default n
	251
1035faf1 MT	252	config ARCH_DISCONTIGMEM_ENABLE
	253	def_bool y
	254	depends on NUMA
	255
	256	config ARCH_DISCONTIGMEM_DEFAULT
	257	def_bool y
	258	depends on NUMA
	259
	260	config ARCH_SPARSEMEM_ENABLE
	261	def_bool y
	262	depends on NUMA
	263
	264	config ARCH_FLATMEM_ENABLE
	265	def_bool y
	266	depends on !NUMA
	267
3f22ab27 DH	268	source "mm/Kconfig"
3f22ab27 DH	269
1035faf1 MT	270	config HAVE_ARCH_EARLY_PFN_TO_NID
	271	def_bool y
	272
1da177e4 LT	273	config HAVE_DEC_LOCK
	274	bool
	275	depends on SMP
	276	default y
	277
	278	config NR_CPUS
	279	int "Maximum number of CPUs (2-256)"
	280	range 2 256
	281	depends on SMP
	282	default "8"
	283	help
	284	This allows you to specify the maximum number of CPUs which this
	285	kernel will support. Current maximum is 256 CPUs due to
	286	APIC addressing limits. Less depending on the hardware.
	287
	288	This is purely to save memory - each supported CPU requires
	289	memory in the static kernel configuration.
	290
76e4f660 AR	291	config HOTPLUG_CPU
	292	bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
	293	depends on SMP && HOTPLUG && EXPERIMENTAL
	294	help
	295	Say Y here to experiment with turning CPUs off and on. CPUs
	296	can be controlled through /sys/devices/system/cpu/cpu#.
	297	Say N if you want to disable CPU hotplug.
	298
	299
1da177e4 LT	300	config HPET_TIMER
	301	bool
	302	default y
	303	help
	304	Use the IA-PC HPET (High Precision Event Timer) to manage
	305	time in preference to the PIT and RTC, if a HPET is
	306	present. The HPET provides a stable time base on SMP
	307	systems, unlike the TSC, but it is more expensive to access,
	308	as it is off-chip. You can find the HPET spec at
	309	<http://www.intel.com/labs/platcomp/hpet/hpetspec.htm>.
	310
312df5f1 AK	311	config X86_PM_TIMER
312df5f1 AK	312	bool "PM timer"
9c2be6a0	313	depends on ACPI
312df5f1 AK	314	default y
	315	help
	316	Support the ACPI PM timer for time keeping. This is slow,
	317	but is useful on some chipsets without HPET on systems with more
	318	than one CPU. On a single processor or single socket multi core
	319	system it is normally not required.
	320	When the PM timer is active 64bit vsyscalls are disabled
	321	and should not be enabled (/proc/sys/kernel/vsyscall64 should
	322	not be changed).
	323	The kernel selects the PM timer only as a last resort, so it is
	324	useful to enable just in case.
	325
1da177e4 LT	326	config HPET_EMULATE_RTC
	327	bool "Provide RTC interrupt"
	328	depends on HPET_TIMER && RTC=y
	329
	330	config GART_IOMMU
	331	bool "IOMMU support"
	332	depends on PCI
	333	help
	334	Support the K8 IOMMU. Needed to run systems with more than 4GB of memory
	335	properly with 32-bit PCI devices that do not support DAC (Double Address
	336	Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.
	337	Normally the kernel will take the right choice by itself.
	338	If unsure, say Y.
	339
	340	# need this always enabled with GART_IOMMU for the VIA workaround
	341	config SWIOTLB
	342	bool
	343	depends on GART_IOMMU
	344	default y
	345
	346	config DUMMY_IOMMU
	347	bool
	348	depends on !GART_IOMMU && !SWIOTLB
	349	default y
	350	help
	351	Don't use IOMMU code. This will cause problems when you have more than 4GB
	352	of memory and any 32-bit devices. Don't turn on unless you know what you
	353	are doing.
	354
	355	config X86_MCE
	356	bool "Machine check support" if EMBEDDED
	357	default y
	358	help
	359	Include a machine check error handler to report hardware errors.
	360	This version will require the mcelog utility to decode some
	361	machine check error logs. See
	362	ftp://ftp.x86-64.org/pub/linux/tools/mcelog
	363
	364	config X86_MCE_INTEL
	365	bool "Intel MCE features"
	366	depends on X86_MCE && X86_LOCAL_APIC
	367	default y
	368	help
	369	Additional support for intel specific MCE features such as
	370	the thermal monitor.
	371
d0537508 EB	372	config PHYSICAL_START
	373	hex "Physical address where the kernel is loaded" if EMBEDDED
	374	default "0x100000"
	375	help
	376	This gives the physical address where the kernel is loaded.
	377	Primarily used in the case of kexec on panic where the
	378	fail safe kernel needs to run at a different address than
	379	the panic-ed kernel.
	380
	381	Don't change this unless you know what you are doing.
	382
5234f5eb EB	383	config KEXEC
	384	bool "kexec system call (EXPERIMENTAL)"
	385	depends on EXPERIMENTAL
	386	help
	387	kexec is a system call that implements the ability to shutdown your
	388	current kernel, and to start another kernel. It is like a reboot
	389	but it is indepedent of the system firmware. And like a reboot
	390	you can start any kernel with it, not just Linux.
	391
	392	The name comes from the similiarity to the exec system call.
	393
	394	It is an ongoing process to be certain the hardware in a machine
	395	is properly shutdown, so do not be surprised if this code does not
	396	initially work for you. It may help to enable device hotplugging
	397	support. As of this writing the exact hardware interface is
	398	strongly in flux, so no good recommendation can be made.
	399
1da177e4 LT	400	config SECCOMP
	401	bool "Enable seccomp to safely compute untrusted bytecode"
	402	depends on PROC_FS
	403	default y
	404	help
	405	This kernel feature is useful for number crunching applications
	406	that may need to compute untrusted bytecode during their
	407	execution. By using pipes or other transports made available to
	408	the process as file descriptors supporting the read/write
	409	syscalls, it's possible to isolate those applications in
	410	their own address space using seccomp. Once seccomp is
	411	enabled via /proc/<pid>/seccomp, it cannot be disabled
	412	and the task is only allowed to execute a few safe syscalls
	413	defined by each seccomp mode.
	414
	415	If unsure, say Y. Only embedded should say N here.
	416
59121003 CL	417	source kernel/Kconfig.hz
59121003 CL	418
1da177e4 LT	419	endmenu
	420
	421	#
	422	# Use the generic interrupt handling code in kernel/irq/:
	423	#
	424	config GENERIC_HARDIRQS
	425	bool
	426	default y
	427
	428	config GENERIC_IRQ_PROBE
	429	bool
	430	default y
	431
5cae841b AV	432	# we have no ISA slots, but we do have ISA-style DMA.
	433	config ISA_DMA_API
	434	bool
	435	default y
	436
1da177e4 LT	437	menu "Power management options"
	438
	439	source kernel/power/Kconfig
	440
	441	source "drivers/acpi/Kconfig"
	442
	443	source "arch/x86_64/kernel/cpufreq/Kconfig"
	444
	445	endmenu
	446
	447	menu "Bus options (PCI etc.)"
	448
	449	config PCI
	450	bool "PCI support"
	451
	452	# x86-64 doesn't support PCI BIOS access from long mode so always go direct.
	453	config PCI_DIRECT
	454	bool
	455	depends on PCI
	456	default y
	457
	458	config PCI_MMCONFIG
	459	bool "Support mmconfig PCI config space access"
8aadff7d	460	depends on PCI && ACPI
1da177e4 LT	461	select ACPI_BOOT
	462
	463	config UNORDERED_IO
	464	bool "Unordered IO mapping access"
	465	depends on EXPERIMENTAL
	466	help
	467	Use unordered stores to access IO memory mappings in device drivers.
	468	Still very experimental. When a driver works on IA64/ppc64/pa-risc it should
	469	work with this option, but it makes the drivers behave differently
	470	from i386. Requires that the driver writer used memory barriers
	471	properly.
	472
	473	source "drivers/pci/pcie/Kconfig"
	474
	475	source "drivers/pci/Kconfig"
	476
	477	source "drivers/pcmcia/Kconfig"
	478
	479	source "drivers/pci/hotplug/Kconfig"
	480
	481	endmenu
	482
	483
	484	menu "Executable file formats / Emulations"
	485
	486	source "fs/Kconfig.binfmt"
	487
	488	config IA32_EMULATION
	489	bool "IA32 Emulation"
	490	help
	491	Include code to run 32-bit programs under a 64-bit kernel. You should likely
	492	turn this on, unless you're 100% sure that you don't have any 32-bit programs
	493	left.
	494
	495	config IA32_AOUT
	496	bool "IA32 a.out support"
	497	depends on IA32_EMULATION
	498	help
	499	Support old a.out binaries in the 32bit emulation.
	500
	501	config COMPAT
	502	bool
	503	depends on IA32_EMULATION
	504	default y
	505
	506	config SYSVIPC_COMPAT
	507	bool
	508	depends on COMPAT && SYSVIPC
	509	default y
	510
	511	config UID16
	512	bool
	513	depends on IA32_EMULATION
	514	default y
	515
	516	endmenu
	517
d5950b43 SR	518	source "net/Kconfig"
d5950b43 SR	519
1da177e4 LT	520	source drivers/Kconfig
	521
	522	source "drivers/firmware/Kconfig"
	523
	524	source fs/Kconfig
	525
	526	source "arch/x86_64/oprofile/Kconfig"
	527
	528	source "arch/x86_64/Kconfig.debug"
	529
	530	source "security/Kconfig"
	531
	532	source "crypto/Kconfig"
	533
	534	source "lib/Kconfig"