Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
john stultz | 1489939 | 2007-02-16 01:28:20 -0800 | [diff] [blame] | 27 | config GENERIC_TIME |
| 28 | bool |
| 29 | default y |
| 30 | |
john stultz | 7460ed2 | 2007-02-16 01:28:21 -0800 | [diff] [blame] | 31 | config GENERIC_TIME_VSYSCALL |
| 32 | bool |
| 33 | default y |
| 34 | |
Christoph Lameter | fb0e794 | 2006-09-25 23:31:13 -0700 | [diff] [blame] | 35 | config ZONE_DMA32 |
| 36 | bool |
| 37 | default y |
| 38 | |
Ingo Molnar | 1e95052 | 2006-07-03 00:25:01 -0700 | [diff] [blame] | 39 | config LOCKDEP_SUPPORT |
| 40 | bool |
| 41 | default y |
| 42 | |
Ingo Molnar | 21b32bb | 2006-07-03 00:24:40 -0700 | [diff] [blame] | 43 | config STACKTRACE_SUPPORT |
| 44 | bool |
| 45 | default y |
| 46 | |
Benjamin LaHaise | 52fdd08 | 2005-09-03 15:56:52 -0700 | [diff] [blame] | 47 | config SEMAPHORE_SLEEPERS |
| 48 | bool |
| 49 | default y |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | config MMU |
| 52 | bool |
| 53 | default y |
| 54 | |
Christoph Lameter | 5ac6da6 | 2007-02-10 01:43:14 -0800 | [diff] [blame] | 55 | config ZONE_DMA |
| 56 | bool |
| 57 | default y |
| 58 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | config ISA |
| 60 | bool |
| 61 | |
| 62 | config SBUS |
| 63 | bool |
| 64 | |
| 65 | config RWSEM_GENERIC_SPINLOCK |
| 66 | bool |
| 67 | default y |
| 68 | |
| 69 | config RWSEM_XCHGADD_ALGORITHM |
| 70 | bool |
| 71 | |
Akinobu Mita | f33e2fb | 2006-03-26 01:39:42 -0800 | [diff] [blame] | 72 | config GENERIC_HWEIGHT |
| 73 | bool |
| 74 | default y |
| 75 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | config GENERIC_CALIBRATE_DELAY |
| 77 | bool |
| 78 | default y |
| 79 | |
| 80 | config X86_CMPXCHG |
| 81 | bool |
| 82 | default y |
| 83 | |
| 84 | config EARLY_PRINTK |
| 85 | bool |
| 86 | default y |
| 87 | |
| 88 | config GENERIC_ISA_DMA |
| 89 | bool |
| 90 | default y |
| 91 | |
| 92 | config GENERIC_IOMAP |
| 93 | bool |
| 94 | default y |
| 95 | |
viro@ZenIV.linux.org.uk | a08b6b7 | 2005-09-06 01:48:42 +0100 | [diff] [blame] | 96 | config ARCH_MAY_HAVE_PC_FDC |
| 97 | bool |
| 98 | default y |
| 99 | |
Mel Gorman | 5cb248a | 2006-09-27 01:49:52 -0700 | [diff] [blame] | 100 | config ARCH_POPULATES_NODE_MAP |
| 101 | def_bool y |
| 102 | |
Andi Kleen | e992867 | 2006-01-11 22:43:33 +0100 | [diff] [blame] | 103 | config DMI |
| 104 | bool |
| 105 | default y |
| 106 | |
Al Viro | e65e1fc | 2006-09-12 03:04:40 -0400 | [diff] [blame] | 107 | config AUDIT_ARCH |
| 108 | bool |
| 109 | default y |
| 110 | |
Jeremy Fitzhardinge | c31a0bf | 2006-12-08 02:36:22 -0800 | [diff] [blame] | 111 | config GENERIC_BUG |
| 112 | bool |
| 113 | default y |
| 114 | depends on BUG |
| 115 | |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 116 | config ARCH_HAS_ILOG2_U32 |
| 117 | bool |
| 118 | default n |
| 119 | |
| 120 | config ARCH_HAS_ILOG2_U64 |
| 121 | bool |
| 122 | default n |
| 123 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | source "init/Kconfig" |
| 125 | |
| 126 | |
| 127 | menu "Processor type and features" |
| 128 | |
| 129 | choice |
Ravikiran G Thirumalai | 79f1261 | 2006-01-11 22:46:18 +0100 | [diff] [blame] | 130 | prompt "Subarchitecture Type" |
| 131 | default X86_PC |
| 132 | |
| 133 | config X86_PC |
| 134 | bool "PC-compatible" |
| 135 | help |
| 136 | Choose this option if your computer is a standard PC or compatible. |
| 137 | |
| 138 | config X86_VSMP |
| 139 | bool "Support for ScaleMP vSMP" |
Andi Kleen | f157cbb | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 140 | depends on PCI |
Ravikiran G Thirumalai | 79f1261 | 2006-01-11 22:46:18 +0100 | [diff] [blame] | 141 | help |
| 142 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
| 143 | supposed to run on these EM64T-based machines. Only choose this option |
| 144 | if you have one of these machines. |
| 145 | |
| 146 | endchoice |
| 147 | |
| 148 | choice |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | prompt "Processor family" |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 150 | default GENERIC_CPU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
| 152 | config MK8 |
| 153 | bool "AMD-Opteron/Athlon64" |
| 154 | help |
| 155 | Optimize for AMD Opteron/Athlon64/Hammer/K8 CPUs. |
| 156 | |
| 157 | config MPSC |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 158 | bool "Intel P4 / older Netburst based Xeon" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | help |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 160 | Optimize for Intel Pentium 4 and older Nocona/Dempsey Xeon CPUs |
| 161 | with Intel Extended Memory 64 Technology(EM64T). For details see |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | <http://www.intel.com/technology/64bitextensions/>. |
Nicolas Kaiser | edf8dd3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 163 | Note that the latest Xeons (Xeon 51xx and 53xx) are not based on the |
| 164 | Netburst core and shouldn't use this option. You can distinguish them |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 165 | using the cpu family field |
Nicolas Kaiser | edf8dd3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 166 | in /proc/cpuinfo. Family 15 is an older Xeon, Family 6 a newer one |
| 167 | (this rule only applies to systems that support EM64T) |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 168 | |
| 169 | config MCORE2 |
| 170 | bool "Intel Core2 / newer Xeon" |
| 171 | help |
| 172 | Optimize for Intel Core2 and newer Xeons (51xx) |
Nicolas Kaiser | edf8dd3 | 2007-02-13 13:26:23 +0100 | [diff] [blame] | 173 | You can distinguish the newer Xeons from the older ones using |
| 174 | the cpu family field in /proc/cpuinfo. 15 is an older Xeon |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 175 | (use CONFIG_MPSC then), 6 is a newer one. This rule only |
| 176 | applies to CPUs that support EM64T. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
| 178 | config GENERIC_CPU |
| 179 | bool "Generic-x86-64" |
| 180 | help |
| 181 | Generic x86-64 CPU. |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 182 | Run equally well on all x86-64 CPUs. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | endchoice |
| 185 | |
| 186 | # |
| 187 | # Define implied options from the CPU selection here |
| 188 | # |
| 189 | config X86_L1_CACHE_BYTES |
| 190 | int |
| 191 | default "128" if GENERIC_CPU || MPSC |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 192 | default "64" if MK8 || MCORE2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | config X86_L1_CACHE_SHIFT |
| 195 | int |
| 196 | default "7" if GENERIC_CPU || MPSC |
Andi Kleen | 7138199 | 2006-12-07 02:14:09 +0100 | [diff] [blame] | 197 | default "6" if MK8 || MCORE2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
Ravikiran G Thirumalai | e405d06 | 2006-04-07 19:50:09 +0200 | [diff] [blame] | 199 | config X86_INTERNODE_CACHE_BYTES |
| 200 | int |
| 201 | default "4096" if X86_VSMP |
| 202 | default X86_L1_CACHE_BYTES if !X86_VSMP |
| 203 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | config X86_TSC |
| 205 | bool |
| 206 | default y |
| 207 | |
| 208 | config X86_GOOD_APIC |
| 209 | bool |
| 210 | default y |
| 211 | |
| 212 | config MICROCODE |
| 213 | tristate "/dev/cpu/microcode - Intel CPU microcode support" |
Shaohua Li | 9a4b9ef | 2006-09-27 01:50:53 -0700 | [diff] [blame] | 214 | select FW_LOADER |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | ---help--- |
| 216 | If you say Y here the 'File systems' section, you will be |
| 217 | able to update the microcode on Intel processors. You will |
| 218 | obviously need the actual microcode binary data itself which is |
| 219 | not shipped with the Linux kernel. |
| 220 | |
| 221 | For latest news and information on obtaining all the required |
| 222 | ingredients for this driver, check: |
| 223 | <http://www.urbanmyth.org/microcode/>. |
| 224 | |
| 225 | To compile this driver as a module, choose M here: the |
| 226 | module will be called microcode. |
| 227 | If you use modprobe or kmod you may also want to add the line |
| 228 | 'alias char-major-10-184 microcode' to your /etc/modules.conf file. |
| 229 | |
Shaohua Li | 9a3110b | 2006-09-27 01:50:51 -0700 | [diff] [blame] | 230 | config MICROCODE_OLD_INTERFACE |
| 231 | bool |
| 232 | depends on MICROCODE |
| 233 | default y |
| 234 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | config X86_MSR |
| 236 | tristate "/dev/cpu/*/msr - Model-specific register support" |
| 237 | help |
| 238 | This device gives privileged processes access to the x86 |
| 239 | Model-Specific Registers (MSRs). It is a character device with |
| 240 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. |
| 241 | MSR accesses are directed to a specific CPU on multi-processor |
| 242 | systems. |
| 243 | |
| 244 | config X86_CPUID |
| 245 | tristate "/dev/cpu/*/cpuid - CPU information support" |
| 246 | help |
| 247 | This device gives processes access to the x86 CPUID instruction to |
| 248 | be executed on a specific processor. It is a character device |
| 249 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to |
| 250 | /dev/cpu/31/cpuid. |
| 251 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | config X86_HT |
| 253 | bool |
| 254 | depends on SMP && !MK8 |
| 255 | default y |
| 256 | |
| 257 | config MATH_EMULATION |
| 258 | bool |
| 259 | |
| 260 | config MCA |
| 261 | bool |
| 262 | |
| 263 | config EISA |
| 264 | bool |
| 265 | |
| 266 | config X86_IO_APIC |
| 267 | bool |
| 268 | default y |
| 269 | |
| 270 | config X86_LOCAL_APIC |
| 271 | bool |
| 272 | default y |
| 273 | |
| 274 | config MTRR |
| 275 | bool "MTRR (Memory Type Range Register) support" |
| 276 | ---help--- |
| 277 | On Intel P6 family processors (Pentium Pro, Pentium II and later) |
| 278 | the Memory Type Range Registers (MTRRs) may be used to control |
| 279 | processor access to memory ranges. This is most useful if you have |
| 280 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining |
| 281 | allows bus write transfers to be combined into a larger transfer |
| 282 | before bursting over the PCI/AGP bus. This can increase performance |
| 283 | of image write operations 2.5 times or more. Saying Y here creates a |
| 284 | /proc/mtrr file which may be used to manipulate your processor's |
| 285 | MTRRs. Typically the X server should use this. |
| 286 | |
| 287 | This code has a reasonably generic interface so that similar |
| 288 | control registers on other processors can be easily supported |
| 289 | as well. |
| 290 | |
| 291 | Saying Y here also fixes a problem with buggy SMP BIOSes which only |
| 292 | set the MTRRs for the boot CPU and not for the secondary CPUs. This |
| 293 | can lead to all sorts of problems, so it's good to say Y here. |
| 294 | |
| 295 | Just say Y here, all x86-64 machines support MTRRs. |
| 296 | |
| 297 | See <file:Documentation/mtrr.txt> for more information. |
| 298 | |
| 299 | config SMP |
| 300 | bool "Symmetric multi-processing support" |
| 301 | ---help--- |
| 302 | This enables support for systems with more than one CPU. If you have |
| 303 | a system with only one CPU, like most personal computers, say N. If |
| 304 | you have a system with more than one CPU, say Y. |
| 305 | |
| 306 | If you say N here, the kernel will run on single and multiprocessor |
| 307 | machines, but will use only one CPU of a multiprocessor machine. If |
| 308 | you say Y here, the kernel will run on many, but not all, |
| 309 | singleprocessor machines. On a singleprocessor machine, the kernel |
| 310 | will run faster if you say N here. |
| 311 | |
| 312 | If you don't know what to do here, say N. |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | config SCHED_SMT |
| 315 | bool "SMT (Hyperthreading) scheduler support" |
| 316 | depends on SMP |
| 317 | default n |
| 318 | help |
| 319 | SMT scheduler support improves the CPU scheduler's decision making |
| 320 | when dealing with Intel Pentium 4 chips with HyperThreading at a |
| 321 | cost of slightly increased overhead in some places. If unsure say |
| 322 | N here. |
| 323 | |
Siddha, Suresh B | 1e9f28f | 2006-03-27 01:15:22 -0800 | [diff] [blame] | 324 | config SCHED_MC |
| 325 | bool "Multi-core scheduler support" |
| 326 | depends on SMP |
| 327 | default y |
| 328 | help |
| 329 | Multi-core scheduler support improves the CPU scheduler's decision |
| 330 | making when dealing with multi-core CPU chips at a cost of slightly |
| 331 | increased overhead in some places. If unsure say N here. |
| 332 | |
Ingo Molnar | cc19ca8 | 2005-06-25 14:57:36 -0700 | [diff] [blame] | 333 | source "kernel/Kconfig.preempt" |
| 334 | |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 335 | config NUMA |
| 336 | bool "Non Uniform Memory Access (NUMA) Support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | depends on SMP |
| 338 | help |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 339 | Enable NUMA (Non Uniform Memory Access) support. The kernel |
| 340 | will try to allocate memory used by a CPU on the local memory |
| 341 | controller of the CPU and add some more NUMA awareness to the kernel. |
| 342 | This code is recommended on all multiprocessor Opteron systems. |
| 343 | If the system is EM64T, you should say N unless your system is EM64T |
| 344 | NUMA. |
| 345 | |
| 346 | config K8_NUMA |
| 347 | bool "Old style AMD Opteron NUMA detection" |
Andi Kleen | f157cbb | 2006-09-26 10:52:41 +0200 | [diff] [blame] | 348 | depends on NUMA && PCI |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 349 | default y |
| 350 | help |
| 351 | Enable K8 NUMA node topology detection. You should say Y here if |
| 352 | you have a multi processor AMD K8 system. This uses an old |
Matt LaPlante | 44c0920 | 2006-10-03 22:34:14 +0200 | [diff] [blame] | 353 | method to read the NUMA configuration directly from the builtin |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 354 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA |
| 355 | instead, which also takes priority if both are compiled in. |
| 356 | |
Yasunori Goto | c80d79d | 2006-04-10 22:53:53 -0700 | [diff] [blame] | 357 | config NODES_SHIFT |
| 358 | int |
| 359 | default "6" |
| 360 | depends on NEED_MULTIPLE_NODES |
| 361 | |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 362 | # Dummy CONFIG option to select ACPI_NUMA from drivers/acpi/Kconfig. |
| 363 | |
| 364 | config X86_64_ACPI_NUMA |
| 365 | bool "ACPI NUMA detection" |
| 366 | depends on NUMA |
| 367 | select ACPI |
Adrian Bunk | 1300124 | 2006-03-28 17:04:00 -0500 | [diff] [blame] | 368 | select PCI |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 369 | select ACPI_NUMA |
| 370 | default y |
| 371 | help |
| 372 | Enable ACPI SRAT based node topology detection. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | |
| 374 | config NUMA_EMU |
Ravikiran G Thirumalai | b0bd35e | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 375 | bool "NUMA emulation" |
| 376 | depends on NUMA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | help |
| 378 | Enable NUMA emulation. A flat machine will be split |
| 379 | into virtual nodes when booted with "numa=fake=N", where N is the |
| 380 | number of nodes. This is only useful for debugging. |
| 381 | |
Dave Hansen | 3f22ab2 | 2005-06-23 00:07:43 -0700 | [diff] [blame] | 382 | config ARCH_DISCONTIGMEM_ENABLE |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | bool |
| 384 | depends on NUMA |
| 385 | default y |
| 386 | |
Matt Tolentino | 1035faf | 2005-06-23 00:08:05 -0700 | [diff] [blame] | 387 | config ARCH_DISCONTIGMEM_DEFAULT |
| 388 | def_bool y |
| 389 | depends on NUMA |
| 390 | |
| 391 | config ARCH_SPARSEMEM_ENABLE |
| 392 | def_bool y |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 393 | depends on (NUMA || EXPERIMENTAL) |
| 394 | |
| 395 | config ARCH_MEMORY_PROBE |
| 396 | def_bool y |
| 397 | depends on MEMORY_HOTPLUG |
Matt Tolentino | 1035faf | 2005-06-23 00:08:05 -0700 | [diff] [blame] | 398 | |
| 399 | config ARCH_FLATMEM_ENABLE |
| 400 | def_bool y |
| 401 | depends on !NUMA |
| 402 | |
Dave Hansen | 3f22ab2 | 2005-06-23 00:07:43 -0700 | [diff] [blame] | 403 | source "mm/Kconfig" |
| 404 | |
Keith Mannthey | ec69acb | 2006-09-30 23:27:05 -0700 | [diff] [blame] | 405 | config MEMORY_HOTPLUG_RESERVE |
| 406 | def_bool y |
| 407 | depends on (MEMORY_HOTPLUG && DISCONTIGMEM) |
| 408 | |
Matt Tolentino | 1035faf | 2005-06-23 00:08:05 -0700 | [diff] [blame] | 409 | config HAVE_ARCH_EARLY_PFN_TO_NID |
| 410 | def_bool y |
Matt Tolentino | 44df75e | 2006-01-17 07:03:41 +0100 | [diff] [blame] | 411 | depends on NUMA |
Matt Tolentino | 1035faf | 2005-06-23 00:08:05 -0700 | [diff] [blame] | 412 | |
KAMEZAWA Hiroyuki | dc8ecb4 | 2006-03-27 01:15:34 -0800 | [diff] [blame] | 413 | config OUT_OF_LINE_PFN_TO_PAGE |
| 414 | def_bool y |
| 415 | depends on DISCONTIGMEM |
| 416 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | config NR_CPUS |
Andi Kleen | d9c9381 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 418 | int "Maximum number of CPUs (2-255)" |
Andi Kleen | 01d4bed | 2006-03-25 16:30:58 +0100 | [diff] [blame] | 419 | range 2 255 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 420 | depends on SMP |
| 421 | default "8" |
| 422 | help |
| 423 | This allows you to specify the maximum number of CPUs which this |
Andi Kleen | d9c9381 | 2007-05-02 19:27:05 +0200 | [diff] [blame] | 424 | kernel will support. Current maximum is 255 CPUs due to |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | APIC addressing limits. Less depending on the hardware. |
| 426 | |
| 427 | This is purely to save memory - each supported CPU requires |
| 428 | memory in the static kernel configuration. |
| 429 | |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 430 | config HOTPLUG_CPU |
| 431 | bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" |
| 432 | depends on SMP && HOTPLUG && EXPERIMENTAL |
| 433 | help |
| 434 | Say Y here to experiment with turning CPUs off and on. CPUs |
| 435 | can be controlled through /sys/devices/system/cpu/cpu#. |
| 436 | Say N if you want to disable CPU hotplug. |
| 437 | |
Yasunori Goto | cc57637 | 2006-06-29 02:24:27 -0700 | [diff] [blame] | 438 | config ARCH_ENABLE_MEMORY_HOTPLUG |
| 439 | def_bool y |
Ashok Raj | 76e4f66 | 2005-06-25 14:55:00 -0700 | [diff] [blame] | 440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | config HPET_TIMER |
| 442 | bool |
| 443 | default y |
| 444 | help |
| 445 | Use the IA-PC HPET (High Precision Event Timer) to manage |
| 446 | time in preference to the PIT and RTC, if a HPET is |
| 447 | present. The HPET provides a stable time base on SMP |
| 448 | systems, unlike the TSC, but it is more expensive to access, |
| 449 | as it is off-chip. You can find the HPET spec at |
Randy Dunlap | 89d7cbf | 2005-09-21 09:55:44 -0700 | [diff] [blame] | 450 | <http://www.intel.com/hardwaredesign/hpetspec.htm>. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
| 452 | config HPET_EMULATE_RTC |
| 453 | bool "Provide RTC interrupt" |
| 454 | depends on HPET_TIMER && RTC=y |
| 455 | |
Andi Kleen | a813ce4 | 2006-06-26 13:57:22 +0200 | [diff] [blame] | 456 | # Mark as embedded because too many people got it wrong. |
| 457 | # The code disables itself when not needed. |
| 458 | config IOMMU |
| 459 | bool "IOMMU support" if EMBEDDED |
Andi Kleen | a54649b | 2005-07-28 21:15:32 -0700 | [diff] [blame] | 460 | default y |
Muli Ben-Yehuda | 17a941d | 2006-01-11 22:44:42 +0100 | [diff] [blame] | 461 | select SWIOTLB |
Roman Zippel | dcc1a66 | 2006-06-22 14:47:35 -0700 | [diff] [blame] | 462 | select AGP |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | depends on PCI |
| 464 | help |
Andi Kleen | a813ce4 | 2006-06-26 13:57:22 +0200 | [diff] [blame] | 465 | Support for full DMA access of devices with 32bit memory access only |
| 466 | on systems with more than 3GB. This is usually needed for USB, |
| 467 | sound, many IDE/SATA chipsets and some other devices. |
| 468 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART |
Karsten Weiss | 5558870 | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 469 | based hardware IOMMU and a software bounce buffer based IOMMU used |
| 470 | on Intel systems and as fallback. |
Andi Kleen | a813ce4 | 2006-06-26 13:57:22 +0200 | [diff] [blame] | 471 | The code is only active when needed (enough memory and limited |
| 472 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified |
| 473 | too. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | |
Jon Mason | e465058 | 2006-06-26 13:58:14 +0200 | [diff] [blame] | 475 | config CALGARY_IOMMU |
| 476 | bool "IBM Calgary IOMMU support" |
Jon Mason | e465058 | 2006-06-26 13:58:14 +0200 | [diff] [blame] | 477 | select SWIOTLB |
| 478 | depends on PCI && EXPERIMENTAL |
| 479 | help |
| 480 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
| 481 | systems. Needed to run systems with more than 3GB of memory |
| 482 | properly with 32-bit PCI devices that do not support DAC |
| 483 | (Double Address Cycle). Calgary also supports bus level |
| 484 | isolation, where all DMAs pass through the IOMMU. This |
| 485 | prevents them from going anywhere except their intended |
| 486 | destination. This catches hard-to-find kernel bugs and |
| 487 | mis-behaving drivers and devices that do not use the DMA-API |
| 488 | properly to set up their DMA buffers. The IOMMU can be |
| 489 | turned off at boot time with the iommu=off parameter. |
| 490 | Normally the kernel will make the right choice by itself. |
| 491 | If unsure, say Y. |
| 492 | |
Muli Ben-Yehuda | bff6547 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 493 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT |
| 494 | bool "Should Calgary be enabled by default?" |
Linus Torvalds | 36f696c | 2007-01-01 10:55:45 -0800 | [diff] [blame] | 495 | default y |
Muli Ben-Yehuda | bff6547 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 496 | depends on CALGARY_IOMMU |
| 497 | help |
Linus Torvalds | 36f696c | 2007-01-01 10:55:45 -0800 | [diff] [blame] | 498 | Should Calgary be enabled by default? if you choose 'y', Calgary |
Muli Ben-Yehuda | bff6547 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 499 | will be used (if it exists). If you choose 'n', Calgary will not be |
| 500 | used even if it exists. If you choose 'n' and would like to use |
| 501 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. |
Linus Torvalds | 36f696c | 2007-01-01 10:55:45 -0800 | [diff] [blame] | 502 | If unsure, say Y. |
Muli Ben-Yehuda | bff6547 | 2006-12-07 02:14:07 +0100 | [diff] [blame] | 503 | |
Andi Kleen | a813ce4 | 2006-06-26 13:57:22 +0200 | [diff] [blame] | 504 | # need this always selected by IOMMU for the VIA workaround |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | config SWIOTLB |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | bool |
Karsten Weiss | 5558870 | 2007-02-13 13:26:21 +0100 | [diff] [blame] | 507 | help |
| 508 | Support for software bounce buffers used on x86-64 systems |
| 509 | which don't have a hardware IOMMU (e.g. the current generation |
| 510 | of Intel's x86-64 CPUs). Using this PCI devices which can only |
| 511 | access 32-bits of memory can be used on systems with more than |
| 512 | 3 GB of memory. If unsure, say Y. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | config X86_MCE |
| 515 | bool "Machine check support" if EMBEDDED |
| 516 | default y |
| 517 | help |
| 518 | Include a machine check error handler to report hardware errors. |
| 519 | This version will require the mcelog utility to decode some |
| 520 | machine check error logs. See |
| 521 | ftp://ftp.x86-64.org/pub/linux/tools/mcelog |
| 522 | |
| 523 | config X86_MCE_INTEL |
| 524 | bool "Intel MCE features" |
| 525 | depends on X86_MCE && X86_LOCAL_APIC |
| 526 | default y |
| 527 | help |
| 528 | Additional support for intel specific MCE features such as |
| 529 | the thermal monitor. |
| 530 | |
Jacob Shin | 89b831e | 2005-11-05 17:25:53 +0100 | [diff] [blame] | 531 | config X86_MCE_AMD |
| 532 | bool "AMD MCE features" |
| 533 | depends on X86_MCE && X86_LOCAL_APIC |
| 534 | default y |
| 535 | help |
| 536 | Additional support for AMD specific MCE features such as |
| 537 | the DRAM Error Threshold. |
| 538 | |
Eric W. Biederman | 5234f5e | 2005-06-25 14:58:02 -0700 | [diff] [blame] | 539 | config KEXEC |
Eric W. Biederman | 1c9c0a6 | 2006-09-26 10:52:40 +0200 | [diff] [blame] | 540 | bool "kexec system call" |
Eric W. Biederman | 5234f5e | 2005-06-25 14:58:02 -0700 | [diff] [blame] | 541 | help |
| 542 | kexec is a system call that implements the ability to shutdown your |
| 543 | current kernel, and to start another kernel. It is like a reboot |
Matt LaPlante | 1f1332f | 2006-06-29 01:32:47 -0400 | [diff] [blame] | 544 | but it is independent of the system firmware. And like a reboot |
Eric W. Biederman | 5234f5e | 2005-06-25 14:58:02 -0700 | [diff] [blame] | 545 | you can start any kernel with it, not just Linux. |
| 546 | |
Matt LaPlante | 1f1332f | 2006-06-29 01:32:47 -0400 | [diff] [blame] | 547 | The name comes from the similarity to the exec system call. |
Eric W. Biederman | 5234f5e | 2005-06-25 14:58:02 -0700 | [diff] [blame] | 548 | |
| 549 | It is an ongoing process to be certain the hardware in a machine |
| 550 | is properly shutdown, so do not be surprised if this code does not |
| 551 | initially work for you. It may help to enable device hotplugging |
| 552 | support. As of this writing the exact hardware interface is |
| 553 | strongly in flux, so no good recommendation can be made. |
| 554 | |
Vivek Goyal | ec9ce0d | 2006-01-09 20:51:49 -0800 | [diff] [blame] | 555 | config CRASH_DUMP |
| 556 | bool "kernel crash dumps (EXPERIMENTAL)" |
Vivek Goyal | ec9ce0d | 2006-01-09 20:51:49 -0800 | [diff] [blame] | 557 | depends on EXPERIMENTAL |
| 558 | help |
Andi Kleen | 1edf777 | 2006-09-26 10:52:35 +0200 | [diff] [blame] | 559 | Generate crash dump after being started by kexec. |
| 560 | This should be normally only set in special crash dump kernels |
| 561 | which are loaded in the main kernel with kexec-tools into |
| 562 | a specially reserved region and then later executed after |
| 563 | a crash by kdump/kexec. The crash dump kernel must be compiled |
| 564 | to a memory address not used by the main kernel or BIOS using |
| 565 | PHYSICAL_START. |
| 566 | For more details see Documentation/kdump/kdump.txt |
Vivek Goyal | ec9ce0d | 2006-01-09 20:51:49 -0800 | [diff] [blame] | 567 | |
Vivek Goyal | 1ab60e0 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 568 | config RELOCATABLE |
| 569 | bool "Build a relocatable kernel(EXPERIMENTAL)" |
| 570 | depends on EXPERIMENTAL |
| 571 | help |
| 572 | Builds a relocatable kernel. This enables loading and running |
| 573 | a kernel binary from a different physical address than it has |
| 574 | been compiled for. |
| 575 | |
| 576 | One use is for the kexec on panic case where the recovery kernel |
| 577 | must live at a different physical address than the primary |
| 578 | kernel. |
| 579 | |
| 580 | Note: If CONFIG_RELOCATABLE=y, then kernel run from the address |
| 581 | it has been loaded at and compile time physical address |
| 582 | (CONFIG_PHYSICAL_START) is ignored. |
| 583 | |
Maneesh Soni | 05970d4 | 2006-01-09 20:51:52 -0800 | [diff] [blame] | 584 | config PHYSICAL_START |
| 585 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) |
Andi Kleen | 0410360 | 2006-03-25 16:30:13 +0100 | [diff] [blame] | 586 | default "0x200000" |
Maneesh Soni | 05970d4 | 2006-01-09 20:51:52 -0800 | [diff] [blame] | 587 | help |
Vivek Goyal | 1ab60e0 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 588 | This gives the physical address where the kernel is loaded. It |
| 589 | should be aligned to 2MB boundary. |
| 590 | |
| 591 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then |
| 592 | bzImage will decompress itself to above physical address and |
| 593 | run from there. Otherwise, bzImage will run from the address where |
| 594 | it has been loaded by the boot loader and will ignore above physical |
| 595 | address. |
| 596 | |
| 597 | In normal kdump cases one does not have to set/change this option |
| 598 | as now bzImage can be compiled as a completely relocatable image |
| 599 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different |
| 600 | address. This option is mainly useful for the folks who don't want |
| 601 | to use a bzImage for capturing the crash dump and want to use a |
| 602 | vmlinux instead. |
| 603 | |
| 604 | So if you are using bzImage for capturing the crash dump, leave |
| 605 | the value here unchanged to 0x200000 and set CONFIG_RELOCATABLE=y. |
| 606 | Otherwise if you plan to use vmlinux for capturing the crash dump |
| 607 | change this value to start of the reserved region (Typically 16MB |
| 608 | 0x1000000). In other words, it can be set based on the "X" value as |
Maneesh Soni | 05970d4 | 2006-01-09 20:51:52 -0800 | [diff] [blame] | 609 | specified in the "crashkernel=YM@XM" command line boot parameter |
| 610 | passed to the panic-ed kernel. Typically this parameter is set as |
| 611 | crashkernel=64M@16M. Please take a look at |
| 612 | Documentation/kdump/kdump.txt for more details about crash dumps. |
| 613 | |
Vivek Goyal | 1ab60e0 | 2007-05-02 19:27:07 +0200 | [diff] [blame] | 614 | Usage of bzImage for capturing the crash dump is advantageous as |
| 615 | one does not have to build two kernels. Same kernel can be used |
| 616 | as production kernel and capture kernel. |
| 617 | |
Maneesh Soni | 05970d4 | 2006-01-09 20:51:52 -0800 | [diff] [blame] | 618 | Don't change this unless you know what you are doing. |
| 619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | config SECCOMP |
| 621 | bool "Enable seccomp to safely compute untrusted bytecode" |
| 622 | depends on PROC_FS |
| 623 | default y |
| 624 | help |
| 625 | This kernel feature is useful for number crunching applications |
| 626 | that may need to compute untrusted bytecode during their |
| 627 | execution. By using pipes or other transports made available to |
| 628 | the process as file descriptors supporting the read/write |
| 629 | syscalls, it's possible to isolate those applications in |
| 630 | their own address space using seccomp. Once seccomp is |
| 631 | enabled via /proc/<pid>/seccomp, it cannot be disabled |
| 632 | and the task is only allowed to execute a few safe syscalls |
| 633 | defined by each seccomp mode. |
| 634 | |
| 635 | If unsure, say Y. Only embedded should say N here. |
| 636 | |
Arjan van de Ven | b62a5c7 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 637 | config CC_STACKPROTECTOR |
Brice Goglin | e45116b | 2006-12-11 20:14:15 +0100 | [diff] [blame] | 638 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" |
Arjan van de Ven | b62a5c7 | 2006-09-26 10:52:38 +0200 | [diff] [blame] | 639 | depends on EXPERIMENTAL |
| 640 | help |
| 641 | This option turns on the -fstack-protector GCC feature. This |
| 642 | feature puts, at the beginning of critical functions, a canary |
| 643 | value on the stack just before the return address, and validates |
| 644 | the value just before actually returning. Stack based buffer |
| 645 | overflows (that need to overwrite this return address) now also |
| 646 | overwrite the canary, which gets detected and the attack is then |
| 647 | neutralized via a kernel panic. |
| 648 | |
| 649 | This feature requires gcc version 4.2 or above, or a distribution |
| 650 | gcc with the feature backported. Older versions are automatically |
| 651 | detected and for those versions, this configuration option is ignored. |
| 652 | |
| 653 | config CC_STACKPROTECTOR_ALL |
| 654 | bool "Use stack-protector for all functions" |
| 655 | depends on CC_STACKPROTECTOR |
| 656 | help |
| 657 | Normally, GCC only inserts the canary value protection for |
| 658 | functions that use large-ish on-stack buffers. By enabling |
| 659 | this option, GCC will be asked to do this for ALL functions. |
| 660 | |
Christoph Lameter | 5912100 | 2005-06-23 00:08:25 -0700 | [diff] [blame] | 661 | source kernel/Kconfig.hz |
| 662 | |
Arjan van de Ven | 4bdc3b7 | 2006-03-25 16:30:49 +0100 | [diff] [blame] | 663 | config REORDER |
| 664 | bool "Function reordering" |
| 665 | default n |
| 666 | help |
| 667 | This option enables the toolchain to reorder functions for a more |
| 668 | optimal TLB usage. If you have pretty much any version of binutils, |
| 669 | this can increase your kernel build time by roughly one minute. |
| 670 | |
Andi Kleen | a32073b | 2006-06-26 13:56:40 +0200 | [diff] [blame] | 671 | config K8_NB |
| 672 | def_bool y |
Andi Kleen | a813ce4 | 2006-06-26 13:57:22 +0200 | [diff] [blame] | 673 | depends on AGP_AMD64 || IOMMU || (PCI && NUMA) |
Andi Kleen | a32073b | 2006-06-26 13:56:40 +0200 | [diff] [blame] | 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | endmenu |
| 676 | |
| 677 | # |
| 678 | # Use the generic interrupt handling code in kernel/irq/: |
| 679 | # |
| 680 | config GENERIC_HARDIRQS |
| 681 | bool |
| 682 | default y |
| 683 | |
| 684 | config GENERIC_IRQ_PROBE |
| 685 | bool |
| 686 | default y |
| 687 | |
Al Viro | 5cae841 | 2005-05-04 05:39:22 +0100 | [diff] [blame] | 688 | # we have no ISA slots, but we do have ISA-style DMA. |
| 689 | config ISA_DMA_API |
| 690 | bool |
| 691 | default y |
| 692 | |
Ashok Raj | 54d5d42 | 2005-09-06 15:16:15 -0700 | [diff] [blame] | 693 | config GENERIC_PENDING_IRQ |
| 694 | bool |
| 695 | depends on GENERIC_HARDIRQS && SMP |
| 696 | default y |
| 697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | menu "Power management options" |
| 699 | |
| 700 | source kernel/power/Kconfig |
| 701 | |
| 702 | source "drivers/acpi/Kconfig" |
| 703 | |
| 704 | source "arch/x86_64/kernel/cpufreq/Kconfig" |
| 705 | |
| 706 | endmenu |
| 707 | |
| 708 | menu "Bus options (PCI etc.)" |
| 709 | |
| 710 | config PCI |
| 711 | bool "PCI support" |
| 712 | |
| 713 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. |
| 714 | config PCI_DIRECT |
| 715 | bool |
| 716 | depends on PCI |
| 717 | default y |
| 718 | |
| 719 | config PCI_MMCONFIG |
| 720 | bool "Support mmconfig PCI config space access" |
Alexander Nyberg | 8aadff7 | 2005-05-27 12:48:50 +0200 | [diff] [blame] | 721 | depends on PCI && ACPI |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | source "drivers/pci/pcie/Kconfig" |
| 724 | |
| 725 | source "drivers/pci/Kconfig" |
| 726 | |
| 727 | source "drivers/pcmcia/Kconfig" |
| 728 | |
| 729 | source "drivers/pci/hotplug/Kconfig" |
| 730 | |
| 731 | endmenu |
| 732 | |
| 733 | |
| 734 | menu "Executable file formats / Emulations" |
| 735 | |
| 736 | source "fs/Kconfig.binfmt" |
| 737 | |
| 738 | config IA32_EMULATION |
| 739 | bool "IA32 Emulation" |
| 740 | help |
| 741 | Include code to run 32-bit programs under a 64-bit kernel. You should likely |
| 742 | turn this on, unless you're 100% sure that you don't have any 32-bit programs |
| 743 | left. |
| 744 | |
| 745 | config IA32_AOUT |
Andi Kleen | ea0be47 | 2005-11-05 17:25:54 +0100 | [diff] [blame] | 746 | tristate "IA32 a.out support" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | depends on IA32_EMULATION |
| 748 | help |
| 749 | Support old a.out binaries in the 32bit emulation. |
| 750 | |
| 751 | config COMPAT |
| 752 | bool |
| 753 | depends on IA32_EMULATION |
| 754 | default y |
| 755 | |
| 756 | config SYSVIPC_COMPAT |
| 757 | bool |
| 758 | depends on COMPAT && SYSVIPC |
| 759 | default y |
| 760 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | endmenu |
| 762 | |
Sam Ravnborg | d5950b4 | 2005-07-11 21:03:49 -0700 | [diff] [blame] | 763 | source "net/Kconfig" |
| 764 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | source drivers/Kconfig |
| 766 | |
| 767 | source "drivers/firmware/Kconfig" |
| 768 | |
| 769 | source fs/Kconfig |
| 770 | |
Prasanna S Panchamukhi | cd6b076 | 2005-11-07 00:59:14 -0800 | [diff] [blame] | 771 | menu "Instrumentation Support" |
| 772 | depends on EXPERIMENTAL |
| 773 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | source "arch/x86_64/oprofile/Kconfig" |
| 775 | |
Prasanna S Panchamukhi | cd6b076 | 2005-11-07 00:59:14 -0800 | [diff] [blame] | 776 | config KPROBES |
| 777 | bool "Kprobes (EXPERIMENTAL)" |
Ananth N Mavinakayanahalli | 3a872d8 | 2006-10-02 02:17:30 -0700 | [diff] [blame] | 778 | depends on KALLSYMS && EXPERIMENTAL && MODULES |
Prasanna S Panchamukhi | cd6b076 | 2005-11-07 00:59:14 -0800 | [diff] [blame] | 779 | help |
| 780 | Kprobes allows you to trap at almost any kernel address and |
| 781 | execute a callback function. register_kprobe() establishes |
| 782 | a probepoint and specifies the callback. Kprobes is useful |
| 783 | for kernel debugging, non-intrusive instrumentation and testing. |
| 784 | If in doubt, say "N". |
| 785 | endmenu |
| 786 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | source "arch/x86_64/Kconfig.debug" |
| 788 | |
| 789 | source "security/Kconfig" |
| 790 | |
| 791 | source "crypto/Kconfig" |
| 792 | |
| 793 | source "lib/Kconfig" |