2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "IA-64 Linux Kernel Configuration"
10 menu "Processor type and features"
16 The Itanium Processor Family is Intel's 64-bit successor to
17 the 32-bit X86 line. The IA-64 Linux project has a home
18 page at <http://www.linuxia64.org/> and a mailing list at
19 <linux-ia64@vger.kernel.org>.
33 config RWSEM_XCHGADD_ALGORITHM
37 config GENERIC_FIND_NEXT_BIT
41 config GENERIC_CALIBRATE_DELAY
45 config TIME_INTERPOLATION
62 bool "Xen hypervisor support"
65 Enable Xen hypervisor support. Resulting kernel runs
66 both as a guest OS on Xen and natively on hardware.
68 config XEN_IA64_VDSO_PARAVIRT
70 depends on XEN && !ITANIUM
73 vDSO paravirtualization
75 config SCHED_NO_NO_OMIT_FRAME_POINTER
79 config IA64_UNCACHED_ALLOCATOR
81 select GENERIC_ALLOCATOR
89 depends on IA64_SGI_SN2
107 This selects the system type of your hardware. A "generic" kernel
108 will run on any supported IA-64 system. However, if you configure
109 a kernel for your specific system, it will be faster and smaller.
111 generic For any supported IA-64 system
112 DIG-compliant For DIG ("Developer's Interface Guide") compliant systems
113 HP-zx1/sx1000 For HP systems
114 HP-zx1/sx1000+swiotlb For HP systems with (broken) DMA-constrained devices.
115 SGI-SN2 For SGI Altix systems
116 Ski-simulator For the HP simulator <http://www.hpl.hp.com/research/linux/ski/>
118 If you don't know what to do, choose "generic".
126 Build a kernel that runs on HP zx1 and sx1000 systems. This adds
127 support for the HP I/O MMU.
129 config IA64_HP_ZX1_SWIOTLB
130 bool "HP-zx1/sx1000 with software I/O TLB"
132 Build a kernel that runs on HP zx1 and sx1000 systems even when they
133 have broken PCI devices which cannot DMA to full 32 bits. Apart
134 from support for the HP I/O MMU, this includes support for the software
135 I/O TLB, which allows supporting the broken devices at the expense of
136 wasting some kernel memory (about 2MB by default).
141 Selecting this option will optimize the kernel for use on sn2 based
142 systems, but the resulting kernel binary will not run on other
143 types of ia64 systems. If you have an SGI Altix system, it's safe
144 to select this option. If in doubt, select ia64 generic support
153 prompt "Processor type"
159 Select your IA-64 processor type. The default is Itanium.
160 This choice is safe for all IA-64 systems, but may not perform
161 optimally on systems with, say, Itanium 2 or newer processors.
166 Select this to configure for an Itanium 2 (McKinley) processor.
171 prompt "Kernel page size"
172 default IA64_PAGE_SIZE_16KB
174 config IA64_PAGE_SIZE_4KB
177 This lets you select the page size of the kernel. For best IA-64
178 performance, a page size of 8KB or 16KB is recommended. For best
179 IA-32 compatibility, a page size of 4KB should be selected (the vast
180 majority of IA-32 binaries work perfectly fine with a larger page
181 size). For Itanium 2 or newer systems, a page size of 64KB can also
184 4KB For best IA-32 compatibility
185 8KB For best IA-64 performance
186 16KB For best IA-64 performance
187 64KB Requires Itanium 2 or newer processor.
189 If you don't know what to do, choose 16KB.
191 config IA64_PAGE_SIZE_8KB
194 config IA64_PAGE_SIZE_16KB
197 config IA64_PAGE_SIZE_64KB
204 prompt "Page Table Levels"
211 depends on !IA64_PAGE_SIZE_64KB
216 source kernel/Kconfig.hz
223 # align cache-sensitive data to 128 bytes
224 config IA64_L1_CACHE_SHIFT
226 default "7" if MCKINLEY
227 default "6" if ITANIUM
230 bool "Cyclone (EXA) Time Source support"
232 Say Y here to enable support for IBM EXA Cyclone time source.
233 If you're unsure, answer N.
237 depends on !IA64_HP_SIM
240 config IA64_SGI_SN_XP
241 tristate "Support communication between SGI SSIs"
242 depends on IA64_GENERIC || IA64_SGI_SN2
243 select IA64_UNCACHED_ALLOCATOR
245 An SGI machine can be divided into multiple Single System
246 Images which act independently of each other and have
247 hardware based memory protection from the others. Enabling
248 this feature will allow for direct communication between SSIs
249 based on a network adapter and DMA messaging.
251 config FORCE_MAX_ZONEORDER
252 int "MAX_ORDER (11 - 17)" if !HUGETLB_PAGE
253 range 11 17 if !HUGETLB_PAGE
254 default "17" if HUGETLB_PAGE
258 bool "Symmetric multi-processing support"
260 This enables support for systems with more than one CPU. If you have
261 a system with only one CPU, say N. If you have a system with more
264 If you say N here, the kernel will run on single and multiprocessor
265 systems, but will use only one CPU of a multiprocessor system. If
266 you say Y here, the kernel will run on many, but not all,
267 single processor systems. On a single processor system, the kernel
268 will run faster if you say N here.
270 See also the <file:Documentation/smp.txt> and the SMP-HOWTO
271 available at <http://www.tldp.org/docs.html#howto>.
273 If you don't know what to do here, say N.
276 int "Maximum number of CPUs (2-1024)"
281 You should set this to the number of CPUs in your system, but
282 keep in mind that a kernel compiled for, e.g., 2 CPUs will boot but
283 only use 2 CPUs on a >2 CPU system. Setting this to a value larger
284 than 64 will cause the use of a CPU mask array, causing a small
288 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
289 depends on SMP && EXPERIMENTAL
293 Say Y here to experiment with turning CPUs off and on. CPUs
294 can be controlled through /sys/devices/system/cpu/cpu#.
295 Say N if you want to disable CPU hotplug.
297 config ARCH_ENABLE_MEMORY_HOTPLUG
301 bool "SMT scheduler support"
304 Improves the CPU scheduler's decision making when dealing with
305 Intel IA64 chips with MultiThreading at a cost of slightly increased
306 overhead in some places. If unsure say N here.
308 config PERMIT_BSP_REMOVE
309 bool "Support removal of Bootstrap Processor"
310 depends on HOTPLUG_CPU
313 Say Y here if your platform SAL will support removal of BSP with HOTPLUG_CPU
316 config FORCE_CPEI_RETARGET
317 bool "Force assumption that CPEI can be re-targetted"
318 depends on PERMIT_BSP_REMOVE
321 Say Y if you need to force the assumption that CPEI can be re-targetted to
322 any cpu in the system. This hint is available via ACPI 3.0 specifications.
323 Tiger4 systems are capable of re-directing CPEI to any CPU other than BSP.
324 This option it useful to enable this feature on older BIOS's as well.
325 You can also enable this by using boot command line option force_cpei=1.
328 bool "Preemptible Kernel"
330 This option reduces the latency of the kernel when reacting to
331 real-time or interactive events by allowing a low priority process to
332 be preempted even if it is in kernel mode executing a system call.
333 This allows applications to run more reliably even when the system is
336 Say Y here if you are building a kernel for a desktop, embedded
337 or real-time system. Say N if you are unsure.
341 config ARCH_SELECT_MEMORY_MODEL
344 config ARCH_DISCONTIGMEM_ENABLE
347 Say Y to support efficient handling of discontiguous physical memory,
348 for architectures which are either NUMA (Non-Uniform Memory Access)
349 or have huge holes in the physical address space for other reasons.
350 See <file:Documentation/vm/numa> for more.
352 config ARCH_FLATMEM_ENABLE
355 config ARCH_SPARSEMEM_ENABLE
357 depends on ARCH_DISCONTIGMEM_ENABLE
359 config ARCH_DISCONTIGMEM_DEFAULT
360 def_bool y if (IA64_SGI_SN2 || IA64_GENERIC || IA64_HP_ZX1 || IA64_HP_ZX1_SWIOTLB)
361 depends on ARCH_DISCONTIGMEM_ENABLE
365 depends on !IA64_HP_SIM && !FLATMEM
366 default y if IA64_SGI_SN2
368 Say Y to compile the kernel to support NUMA (Non-Uniform Memory
369 Access). This option is for configuring high-end multiprocessor
370 server systems. If in doubt, say N.
373 int "Max num nodes shift(3-10)"
376 depends on NEED_MULTIPLE_NODES
378 This option specifies the maximum number of nodes in your SSI system.
379 MAX_NUMNODES will be 2^(This value).
380 If in doubt, use the default.
382 # VIRTUAL_MEM_MAP and FLAT_NODE_MEM_MAP are functionally equivalent.
383 # VIRTUAL_MEM_MAP has been retained for historical reasons.
384 config VIRTUAL_MEM_MAP
385 bool "Virtual mem map"
386 depends on !SPARSEMEM
387 default y if !IA64_HP_SIM
389 Say Y to compile the kernel with support for a virtual mem map.
390 This code also only takes effect if a memory hole of greater than
391 1 Gb is found during boot. You must turn this option on if you
392 require the DISCONTIGMEM option for your machine. If you are
397 default y if VIRTUAL_MEM_MAP
399 config HAVE_ARCH_EARLY_PFN_TO_NID
401 depends on NEED_MULTIPLE_NODES
403 config HAVE_ARCH_NODEDATA_EXTENSION
408 bool "Support for Linux/x86 binaries"
410 IA-64 processors can execute IA-32 (X86) instructions. By
411 saying Y here, the kernel will include IA-32 system call
412 emulation support which makes it possible to transparently
413 run IA-32 Linux binaries on an IA-64 Linux system.
418 depends on IA32_SUPPORT
421 config IA64_MCA_RECOVERY
422 tristate "MCA recovery from errors other than TLB."
425 bool "Performance monitor support"
427 Selects whether support for the IA-64 performance monitor hardware
428 is included in the kernel. This makes some kernel data-structures a
429 little bigger and slows down execution a bit, but it is generally
430 a good idea to turn this on. If you're unsure, say Y.
433 tristate "/proc/pal support"
435 If you say Y here, you are able to get PAL (Processor Abstraction
436 Layer) information in /proc/pal. This contains useful information
437 about the processors in your systems, such as cache and TLB sizes
438 and the PAL firmware version in use.
440 To use this option, you have to ensure that the "/proc file system
441 support" (CONFIG_PROC_FS) is enabled, too.
444 def_bool y if (IA64_SGI_SN2 || IA64_GENERIC)
446 source "drivers/sn/Kconfig"
448 source "drivers/firmware/Kconfig"
450 source "fs/Kconfig.binfmt"
454 menu "Power management and ACPI"
456 source "kernel/power/Kconfig"
458 source "drivers/acpi/Kconfig"
462 source "arch/ia64/kernel/cpufreq/Kconfig"
470 menu "Bus options (PCI, PCMCIA)"
475 Real IA-64 machines all have PCI/PCI-X/PCI Express busses. Say Y
476 here unless you are using a simulator without PCI support.
482 config XEN_PCIDEV_FRONTEND
483 bool "Xen PCI Frontend"
484 depends on PCI && XEN
487 The PCI device frontend driver allows the kernel to import arbitrary
488 PCI devices from a PCI backend to support PCI driver domains.
490 config XEN_PCIDEV_FE_DEBUG
491 bool "Xen PCI Frontend Debugging"
492 depends on XEN_PCIDEV_FRONTEND
495 Enables some debug statements within the PCI Frontend.
497 source "drivers/pci/pcie/Kconfig"
499 source "drivers/pci/Kconfig"
501 source "drivers/pci/hotplug/Kconfig"
503 source "drivers/pcmcia/Kconfig"
511 source "drivers/Kconfig"
518 # Use the generic interrupt handling code in kernel/irq/:
520 config GENERIC_HARDIRQS
524 config GENERIC_IRQ_PROBE
528 config GENERIC_PENDING_IRQ
530 depends on GENERIC_HARDIRQS && SMP
537 source "arch/ia64/hp/sim/Kconfig"
539 menu "Instrumentation Support"
540 depends on EXPERIMENTAL
542 source "arch/ia64/oprofile/Kconfig"
545 bool "Kprobes (EXPERIMENTAL)"
546 depends on EXPERIMENTAL && MODULES
548 Kprobes allows you to trap at almost any kernel address and
549 execute a callback function. register_kprobe() establishes
550 a probepoint and specifies the callback. Kprobes is useful
551 for kernel debugging, non-intrusive instrumentation and testing.
552 If in doubt, say "N".
555 source "arch/ia64/Kconfig.debug"
557 source "kernel/vserver/Kconfig"
559 source "security/Kconfig"
561 source "crypto/Kconfig"
564 # override default values of drivers/xen/Kconfig
570 config HAVE_ARCH_ALLOC_SKB
573 config HAVE_ARCH_DEV_ALLOC_SKB
592 source "drivers/xen/Kconfig"