Sam Ravnborg | 1032c0b | 2007-11-06 21:35:08 +0100 | [diff] [blame] | 1 | # x86 configuration |
Sam Ravnborg | daa93fa | 2007-11-12 20:54:30 +0100 | [diff] [blame] | 2 | mainmenu "Linux Kernel Configuration for x86" |
| 3 | |
| 4 | # Select 32 or 64 bit |
| 5 | config 64BIT |
Sam Ravnborg | 6840999 | 2007-11-17 15:37:31 +0100 | [diff] [blame] | 6 | bool "64-bit kernel" if ARCH = "x86" |
| 7 | default ARCH = "x86_64" |
Sam Ravnborg | daa93fa | 2007-11-12 20:54:30 +0100 | [diff] [blame] | 8 | help |
| 9 | Say yes to build a 64-bit kernel - formerly known as x86_64 |
| 10 | Say no to build a 32-bit kernel - formerly known as i386 |
| 11 | |
| 12 | config X86_32 |
| 13 | def_bool !64BIT |
| 14 | |
| 15 | config X86_64 |
| 16 | def_bool 64BIT |
Sam Ravnborg | 1032c0b | 2007-11-06 21:35:08 +0100 | [diff] [blame] | 17 | |
| 18 | ### Arch settings |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 19 | config X86 |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 20 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 21 | |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 22 | config GENERIC_LOCKBREAK |
Nick Piggin | 314cdbe | 2008-01-30 13:31:21 +0100 | [diff] [blame] | 23 | def_bool n |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 24 | |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 25 | config GENERIC_TIME |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 26 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 27 | |
| 28 | config GENERIC_CMOS_UPDATE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 29 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 30 | |
| 31 | config CLOCKSOURCE_WATCHDOG |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 32 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 33 | |
| 34 | config GENERIC_CLOCKEVENTS |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 35 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 36 | |
| 37 | config GENERIC_CLOCKEVENTS_BROADCAST |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 38 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 39 | depends on X86_64 || (X86_32 && X86_LOCAL_APIC) |
| 40 | |
| 41 | config LOCKDEP_SUPPORT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 42 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 43 | |
| 44 | config STACKTRACE_SUPPORT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 45 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 46 | |
| 47 | config SEMAPHORE_SLEEPERS |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 48 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 49 | |
| 50 | config MMU |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 51 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 52 | |
| 53 | config ZONE_DMA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 54 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 55 | |
| 56 | config QUICKLIST |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 57 | def_bool X86_32 |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 58 | |
| 59 | config SBUS |
| 60 | bool |
| 61 | |
| 62 | config GENERIC_ISA_DMA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 63 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 64 | |
| 65 | config GENERIC_IOMAP |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 66 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 67 | |
| 68 | config GENERIC_BUG |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 69 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 70 | depends on BUG |
| 71 | |
| 72 | config GENERIC_HWEIGHT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 73 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 74 | |
| 75 | config ARCH_MAY_HAVE_PC_FDC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 76 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 77 | |
| 78 | config DMI |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 79 | def_bool y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 80 | |
Sam Ravnborg | 1032c0b | 2007-11-06 21:35:08 +0100 | [diff] [blame] | 81 | config RWSEM_GENERIC_SPINLOCK |
| 82 | def_bool !X86_XADD |
| 83 | |
| 84 | config RWSEM_XCHGADD_ALGORITHM |
| 85 | def_bool X86_XADD |
| 86 | |
| 87 | config ARCH_HAS_ILOG2_U32 |
| 88 | def_bool n |
| 89 | |
| 90 | config ARCH_HAS_ILOG2_U64 |
| 91 | def_bool n |
| 92 | |
| 93 | config GENERIC_CALIBRATE_DELAY |
| 94 | def_bool y |
| 95 | |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 96 | config GENERIC_TIME_VSYSCALL |
| 97 | bool |
| 98 | default X86_64 |
| 99 | |
Mike Travis | dd5af90 | 2008-01-30 13:33:32 +0100 | [diff] [blame^] | 100 | config HAVE_SETUP_PER_CPU_AREA |
travis@sgi.com | b32ef63 | 2008-01-30 13:32:51 +0100 | [diff] [blame] | 101 | def_bool X86_64 |
| 102 | |
Linus Torvalds | 3743d33 | 2007-12-06 09:41:12 -0800 | [diff] [blame] | 103 | config ARCH_SUPPORTS_OPROFILE |
| 104 | bool |
| 105 | default y |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 106 | |
| 107 | |
| 108 | config ZONE_DMA32 |
| 109 | bool |
| 110 | default X86_64 |
| 111 | |
| 112 | config ARCH_POPULATES_NODE_MAP |
| 113 | def_bool y |
| 114 | |
| 115 | config AUDIT_ARCH |
| 116 | bool |
| 117 | default X86_64 |
| 118 | |
| 119 | # Use the generic interrupt handling code in kernel/irq/: |
| 120 | config GENERIC_HARDIRQS |
| 121 | bool |
| 122 | default y |
| 123 | |
| 124 | config GENERIC_IRQ_PROBE |
| 125 | bool |
| 126 | default y |
| 127 | |
| 128 | config GENERIC_PENDING_IRQ |
| 129 | bool |
| 130 | depends on GENERIC_HARDIRQS && SMP |
| 131 | default y |
| 132 | |
| 133 | config X86_SMP |
| 134 | bool |
Sam Ravnborg | 6b0c3d4 | 2008-01-30 13:32:27 +0100 | [diff] [blame] | 135 | depends on SMP && ((X86_32 && !X86_VOYAGER) || X86_64) |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 136 | default y |
| 137 | |
Sam Ravnborg | 6b0c3d4 | 2008-01-30 13:32:27 +0100 | [diff] [blame] | 138 | config X86_32_SMP |
| 139 | def_bool y |
| 140 | depends on X86_32 && SMP |
| 141 | |
| 142 | config X86_64_SMP |
| 143 | def_bool y |
| 144 | depends on X86_64 && SMP |
| 145 | |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 146 | config X86_HT |
| 147 | bool |
Adrian Bunk | ee0011a | 2007-12-04 17:19:07 +0100 | [diff] [blame] | 148 | depends on SMP |
| 149 | depends on (X86_32 && !(X86_VISWS || X86_VOYAGER)) || (X86_64 && !MK8) |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 150 | default y |
| 151 | |
| 152 | config X86_BIOS_REBOOT |
| 153 | bool |
| 154 | depends on X86_32 && !(X86_VISWS || X86_VOYAGER) |
| 155 | default y |
| 156 | |
| 157 | config X86_TRAMPOLINE |
| 158 | bool |
| 159 | depends on X86_SMP || (X86_VOYAGER && SMP) |
| 160 | default y |
| 161 | |
| 162 | config KTIME_SCALAR |
| 163 | def_bool X86_32 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 164 | source "init/Kconfig" |
Sam Ravnborg | 8d5fffb | 2007-11-06 23:30:30 +0100 | [diff] [blame] | 165 | |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 166 | menu "Processor type and features" |
| 167 | |
| 168 | source "kernel/time/Kconfig" |
| 169 | |
| 170 | config SMP |
| 171 | bool "Symmetric multi-processing support" |
| 172 | ---help--- |
| 173 | This enables support for systems with more than one CPU. If you have |
| 174 | a system with only one CPU, like most personal computers, say N. If |
| 175 | you have a system with more than one CPU, say Y. |
| 176 | |
| 177 | If you say N here, the kernel will run on single and multiprocessor |
| 178 | machines, but will use only one CPU of a multiprocessor machine. If |
| 179 | you say Y here, the kernel will run on many, but not all, |
| 180 | singleprocessor machines. On a singleprocessor machine, the kernel |
| 181 | will run faster if you say N here. |
| 182 | |
| 183 | Note that if you say Y here and choose architecture "586" or |
| 184 | "Pentium" under "Processor family", the kernel will not work on 486 |
| 185 | architectures. Similarly, multiprocessor kernels for the "PPro" |
| 186 | architecture may not work on all Pentium based boards. |
| 187 | |
| 188 | People using multiprocessor machines who say Y here should also say |
| 189 | Y to "Enhanced Real Time Clock Support", below. The "Advanced Power |
| 190 | Management" code will be disabled if you say Y here. |
| 191 | |
| 192 | See also the <file:Documentation/smp.txt>, |
| 193 | <file:Documentation/i386/IO-APIC.txt>, |
| 194 | <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at |
| 195 | <http://www.tldp.org/docs.html#howto>. |
| 196 | |
| 197 | If you don't know what to do here, say N. |
| 198 | |
| 199 | choice |
| 200 | prompt "Subarchitecture Type" |
| 201 | default X86_PC |
| 202 | |
| 203 | config X86_PC |
| 204 | bool "PC-compatible" |
| 205 | help |
| 206 | Choose this option if your computer is a standard PC or compatible. |
| 207 | |
| 208 | config X86_ELAN |
| 209 | bool "AMD Elan" |
| 210 | depends on X86_32 |
| 211 | help |
| 212 | Select this for an AMD Elan processor. |
| 213 | |
| 214 | Do not use this option for K6/Athlon/Opteron processors! |
| 215 | |
| 216 | If unsure, choose "PC-compatible" instead. |
| 217 | |
| 218 | config X86_VOYAGER |
| 219 | bool "Voyager (NCR)" |
| 220 | depends on X86_32 |
| 221 | select SMP if !BROKEN |
| 222 | help |
| 223 | Voyager is an MCA-based 32-way capable SMP architecture proprietary |
| 224 | to NCR Corp. Machine classes 345x/35xx/4100/51xx are Voyager-based. |
| 225 | |
| 226 | *** WARNING *** |
| 227 | |
| 228 | If you do not specifically know you have a Voyager based machine, |
| 229 | say N here, otherwise the kernel you build will not be bootable. |
| 230 | |
| 231 | config X86_NUMAQ |
| 232 | bool "NUMAQ (IBM/Sequent)" |
| 233 | select SMP |
| 234 | select NUMA |
| 235 | depends on X86_32 |
| 236 | help |
| 237 | This option is used for getting Linux to run on a (IBM/Sequent) NUMA |
| 238 | multiquad box. This changes the way that processors are bootstrapped, |
| 239 | and uses Clustered Logical APIC addressing mode instead of Flat Logical. |
| 240 | You will need a new lynxer.elf file to flash your firmware with - send |
| 241 | email to <Martin.Bligh@us.ibm.com>. |
| 242 | |
| 243 | config X86_SUMMIT |
| 244 | bool "Summit/EXA (IBM x440)" |
| 245 | depends on X86_32 && SMP |
| 246 | help |
| 247 | This option is needed for IBM systems that use the Summit/EXA chipset. |
| 248 | In particular, it is needed for the x440. |
| 249 | |
| 250 | If you don't have one of these computers, you should say N here. |
| 251 | If you want to build a NUMA kernel, you must select ACPI. |
| 252 | |
| 253 | config X86_BIGSMP |
| 254 | bool "Support for other sub-arch SMP systems with more than 8 CPUs" |
| 255 | depends on X86_32 && SMP |
| 256 | help |
| 257 | This option is needed for the systems that have more than 8 CPUs |
| 258 | and if the system is not of any sub-arch type above. |
| 259 | |
| 260 | If you don't have such a system, you should say N here. |
| 261 | |
| 262 | config X86_VISWS |
| 263 | bool "SGI 320/540 (Visual Workstation)" |
| 264 | depends on X86_32 |
| 265 | help |
| 266 | The SGI Visual Workstation series is an IA32-based workstation |
| 267 | based on SGI systems chips with some legacy PC hardware attached. |
| 268 | |
| 269 | Say Y here to create a kernel to run on the SGI 320 or 540. |
| 270 | |
| 271 | A kernel compiled for the Visual Workstation will not run on PCs |
| 272 | and vice versa. See <file:Documentation/sgi-visws.txt> for details. |
| 273 | |
| 274 | config X86_GENERICARCH |
| 275 | bool "Generic architecture (Summit, bigsmp, ES7000, default)" |
| 276 | depends on X86_32 |
| 277 | help |
| 278 | This option compiles in the Summit, bigsmp, ES7000, default subarchitectures. |
| 279 | It is intended for a generic binary kernel. |
| 280 | If you want a NUMA kernel, select ACPI. We need SRAT for NUMA. |
| 281 | |
| 282 | config X86_ES7000 |
| 283 | bool "Support for Unisys ES7000 IA32 series" |
| 284 | depends on X86_32 && SMP |
| 285 | help |
| 286 | Support for Unisys ES7000 systems. Say 'Y' here if this kernel is |
| 287 | supposed to run on an IA32-based Unisys ES7000 system. |
| 288 | Only choose this option if you have such a system, otherwise you |
| 289 | should say N here. |
| 290 | |
| 291 | config X86_VSMP |
| 292 | bool "Support for ScaleMP vSMP" |
| 293 | depends on X86_64 && PCI |
| 294 | help |
| 295 | Support for ScaleMP vSMP systems. Say 'Y' here if this kernel is |
| 296 | supposed to run on these EM64T-based machines. Only choose this option |
| 297 | if you have one of these machines. |
| 298 | |
| 299 | endchoice |
| 300 | |
| 301 | config SCHED_NO_NO_OMIT_FRAME_POINTER |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 302 | def_bool y |
| 303 | prompt "Single-depth WCHAN output" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 304 | depends on X86_32 |
| 305 | help |
| 306 | Calculate simpler /proc/<PID>/wchan values. If this option |
| 307 | is disabled then wchan values will recurse back to the |
| 308 | caller function. This provides more accurate wchan values, |
| 309 | at the expense of slightly more scheduling overhead. |
| 310 | |
| 311 | If in doubt, say "Y". |
| 312 | |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 313 | menuconfig PARAVIRT_GUEST |
| 314 | bool "Paravirtualized guest support" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 315 | help |
| 316 | Say Y here to get to see options related to running Linux under |
| 317 | various hypervisors. This option alone does not add any kernel code. |
| 318 | |
| 319 | If you say N, all options in this submenu will be skipped and disabled. |
| 320 | |
| 321 | if PARAVIRT_GUEST |
| 322 | |
| 323 | source "arch/x86/xen/Kconfig" |
| 324 | |
| 325 | config VMI |
| 326 | bool "VMI Guest support" |
| 327 | select PARAVIRT |
Eduardo Pereira Habkost | 42d545c | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 328 | depends on X86_32 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 329 | depends on !(X86_VISWS || X86_VOYAGER) |
| 330 | help |
| 331 | VMI provides a paravirtualized interface to the VMware ESX server |
| 332 | (it could be used by other hypervisors in theory too, but is not |
| 333 | at the moment), by linking the kernel to a GPL-ed ROM module |
| 334 | provided by the hypervisor. |
| 335 | |
| 336 | source "arch/x86/lguest/Kconfig" |
| 337 | |
Eduardo Pereira Habkost | e61bd94 | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 338 | config PARAVIRT |
| 339 | bool "Enable paravirtualization code" |
Eduardo Pereira Habkost | 42d545c | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 340 | depends on !(X86_VISWS || X86_VOYAGER) |
Eduardo Pereira Habkost | e61bd94 | 2008-01-30 13:33:32 +0100 | [diff] [blame] | 341 | help |
| 342 | This changes the kernel so it can modify itself when it is run |
| 343 | under a hypervisor, potentially improving performance significantly |
| 344 | over full virtualization. However, when run without a hypervisor |
| 345 | the kernel is theoretically slower and slightly larger. |
| 346 | |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 347 | endif |
| 348 | |
| 349 | config ACPI_SRAT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 350 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 351 | depends on X86_32 && ACPI && NUMA && (X86_SUMMIT || X86_GENERICARCH) |
| 352 | select ACPI_NUMA |
| 353 | |
| 354 | config HAVE_ARCH_PARSE_SRAT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 355 | def_bool y |
| 356 | depends on ACPI_SRAT |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 357 | |
| 358 | config X86_SUMMIT_NUMA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 359 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 360 | depends on X86_32 && NUMA && (X86_SUMMIT || X86_GENERICARCH) |
| 361 | |
| 362 | config X86_CYCLONE_TIMER |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 363 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 364 | depends on X86_32 && X86_SUMMIT || X86_GENERICARCH |
| 365 | |
| 366 | config ES7000_CLUSTERED_APIC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 367 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 368 | depends on SMP && X86_ES7000 && MPENTIUMIII |
| 369 | |
| 370 | source "arch/x86/Kconfig.cpu" |
| 371 | |
| 372 | config HPET_TIMER |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 373 | def_bool X86_64 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 374 | prompt "HPET Timer Support" if X86_32 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 375 | help |
| 376 | Use the IA-PC HPET (High Precision Event Timer) to manage |
| 377 | time in preference to the PIT and RTC, if a HPET is |
| 378 | present. |
| 379 | HPET is the next generation timer replacing legacy 8254s. |
| 380 | The HPET provides a stable time base on SMP |
| 381 | systems, unlike the TSC, but it is more expensive to access, |
| 382 | as it is off-chip. You can find the HPET spec at |
| 383 | <http://www.intel.com/hardwaredesign/hpetspec.htm>. |
| 384 | |
| 385 | You can safely choose Y here. However, HPET will only be |
| 386 | activated if the platform and the BIOS support this feature. |
| 387 | Otherwise the 8254 will be used for timing services. |
| 388 | |
| 389 | Choose N to continue using the legacy 8254 timer. |
| 390 | |
| 391 | config HPET_EMULATE_RTC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 392 | def_bool y |
Bernhard Walle | f8f7648 | 2008-01-30 13:33:31 +0100 | [diff] [blame] | 393 | depends on HPET_TIMER && (RTC=y || RTC=m) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 394 | |
| 395 | # Mark as embedded because too many people got it wrong. |
| 396 | # The code disables itself when not needed. |
| 397 | config GART_IOMMU |
| 398 | bool "GART IOMMU support" if EMBEDDED |
| 399 | default y |
| 400 | select SWIOTLB |
| 401 | select AGP |
| 402 | depends on X86_64 && PCI |
| 403 | help |
| 404 | Support for full DMA access of devices with 32bit memory access only |
| 405 | on systems with more than 3GB. This is usually needed for USB, |
| 406 | sound, many IDE/SATA chipsets and some other devices. |
| 407 | Provides a driver for the AMD Athlon64/Opteron/Turion/Sempron GART |
| 408 | based hardware IOMMU and a software bounce buffer based IOMMU used |
| 409 | on Intel systems and as fallback. |
| 410 | The code is only active when needed (enough memory and limited |
| 411 | device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified |
| 412 | too. |
| 413 | |
| 414 | config CALGARY_IOMMU |
| 415 | bool "IBM Calgary IOMMU support" |
| 416 | select SWIOTLB |
| 417 | depends on X86_64 && PCI && EXPERIMENTAL |
| 418 | help |
| 419 | Support for hardware IOMMUs in IBM's xSeries x366 and x460 |
| 420 | systems. Needed to run systems with more than 3GB of memory |
| 421 | properly with 32-bit PCI devices that do not support DAC |
| 422 | (Double Address Cycle). Calgary also supports bus level |
| 423 | isolation, where all DMAs pass through the IOMMU. This |
| 424 | prevents them from going anywhere except their intended |
| 425 | destination. This catches hard-to-find kernel bugs and |
| 426 | mis-behaving drivers and devices that do not use the DMA-API |
| 427 | properly to set up their DMA buffers. The IOMMU can be |
| 428 | turned off at boot time with the iommu=off parameter. |
| 429 | Normally the kernel will make the right choice by itself. |
| 430 | If unsure, say Y. |
| 431 | |
| 432 | config CALGARY_IOMMU_ENABLED_BY_DEFAULT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 433 | def_bool y |
| 434 | prompt "Should Calgary be enabled by default?" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 435 | depends on CALGARY_IOMMU |
| 436 | help |
| 437 | Should Calgary be enabled by default? if you choose 'y', Calgary |
| 438 | will be used (if it exists). If you choose 'n', Calgary will not be |
| 439 | used even if it exists. If you choose 'n' and would like to use |
| 440 | Calgary anyway, pass 'iommu=calgary' on the kernel command line. |
| 441 | If unsure, say Y. |
| 442 | |
| 443 | # need this always selected by IOMMU for the VIA workaround |
| 444 | config SWIOTLB |
| 445 | bool |
| 446 | help |
| 447 | Support for software bounce buffers used on x86-64 systems |
| 448 | which don't have a hardware IOMMU (e.g. the current generation |
| 449 | of Intel's x86-64 CPUs). Using this PCI devices which can only |
| 450 | access 32-bits of memory can be used on systems with more than |
| 451 | 3 GB of memory. If unsure, say Y. |
| 452 | |
| 453 | |
| 454 | config NR_CPUS |
| 455 | int "Maximum number of CPUs (2-255)" |
| 456 | range 2 255 |
| 457 | depends on SMP |
| 458 | default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 |
| 459 | default "8" |
| 460 | help |
| 461 | This allows you to specify the maximum number of CPUs which this |
| 462 | kernel will support. The maximum supported value is 255 and the |
| 463 | minimum value which makes sense is 2. |
| 464 | |
| 465 | This is purely to save memory - each supported CPU adds |
| 466 | approximately eight kilobytes to the kernel image. |
| 467 | |
| 468 | config SCHED_SMT |
| 469 | bool "SMT (Hyperthreading) scheduler support" |
| 470 | depends on (X86_64 && SMP) || (X86_32 && X86_HT) |
| 471 | help |
| 472 | SMT scheduler support improves the CPU scheduler's decision making |
| 473 | when dealing with Intel Pentium 4 chips with HyperThreading at a |
| 474 | cost of slightly increased overhead in some places. If unsure say |
| 475 | N here. |
| 476 | |
| 477 | config SCHED_MC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 478 | def_bool y |
| 479 | prompt "Multi-core scheduler support" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 480 | depends on (X86_64 && SMP) || (X86_32 && X86_HT) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 481 | help |
| 482 | Multi-core scheduler support improves the CPU scheduler's decision |
| 483 | making when dealing with multi-core CPU chips at a cost of slightly |
| 484 | increased overhead in some places. If unsure say N here. |
| 485 | |
| 486 | source "kernel/Kconfig.preempt" |
| 487 | |
| 488 | config X86_UP_APIC |
| 489 | bool "Local APIC support on uniprocessors" |
| 490 | depends on X86_32 && !SMP && !(X86_VISWS || X86_VOYAGER || X86_GENERICARCH) |
| 491 | help |
| 492 | A local APIC (Advanced Programmable Interrupt Controller) is an |
| 493 | integrated interrupt controller in the CPU. If you have a single-CPU |
| 494 | system which has a processor with a local APIC, you can say Y here to |
| 495 | enable and use it. If you say Y here even though your machine doesn't |
| 496 | have a local APIC, then the kernel will still run with no slowdown at |
| 497 | all. The local APIC supports CPU-generated self-interrupts (timer, |
| 498 | performance counters), and the NMI watchdog which detects hard |
| 499 | lockups. |
| 500 | |
| 501 | config X86_UP_IOAPIC |
| 502 | bool "IO-APIC support on uniprocessors" |
| 503 | depends on X86_UP_APIC |
| 504 | help |
| 505 | An IO-APIC (I/O Advanced Programmable Interrupt Controller) is an |
| 506 | SMP-capable replacement for PC-style interrupt controllers. Most |
| 507 | SMP systems and many recent uniprocessor systems have one. |
| 508 | |
| 509 | If you have a single-CPU system with an IO-APIC, you can say Y here |
| 510 | to use it. If you say Y here even though your machine doesn't have |
| 511 | an IO-APIC, then the kernel will still run with no slowdown at all. |
| 512 | |
| 513 | config X86_LOCAL_APIC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 514 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 515 | depends on X86_64 || (X86_32 && (X86_UP_APIC || ((X86_VISWS || SMP) && !X86_VOYAGER) || X86_GENERICARCH)) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 516 | |
| 517 | config X86_IO_APIC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 518 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 519 | depends on X86_64 || (X86_32 && (X86_UP_IOAPIC || (SMP && !(X86_VISWS || X86_VOYAGER)) || X86_GENERICARCH)) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 520 | |
| 521 | config X86_VISWS_APIC |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 522 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 523 | depends on X86_32 && X86_VISWS |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 524 | |
| 525 | config X86_MCE |
| 526 | bool "Machine Check Exception" |
| 527 | depends on !X86_VOYAGER |
| 528 | ---help--- |
| 529 | Machine Check Exception support allows the processor to notify the |
| 530 | kernel if it detects a problem (e.g. overheating, component failure). |
| 531 | The action the kernel takes depends on the severity of the problem, |
| 532 | ranging from a warning message on the console, to halting the machine. |
| 533 | Your processor must be a Pentium or newer to support this - check the |
| 534 | flags in /proc/cpuinfo for mce. Note that some older Pentium systems |
| 535 | have a design flaw which leads to false MCE events - hence MCE is |
| 536 | disabled on all P5 processors, unless explicitly enabled with "mce" |
| 537 | as a boot argument. Similarly, if MCE is built in and creates a |
| 538 | problem on some new non-standard machine, you can boot with "nomce" |
| 539 | to disable it. MCE support simply ignores non-MCE processors like |
| 540 | the 386 and 486, so nearly everyone can say Y here. |
| 541 | |
| 542 | config X86_MCE_INTEL |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 543 | def_bool y |
| 544 | prompt "Intel MCE features" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 545 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 546 | help |
| 547 | Additional support for intel specific MCE features such as |
| 548 | the thermal monitor. |
| 549 | |
| 550 | config X86_MCE_AMD |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 551 | def_bool y |
| 552 | prompt "AMD MCE features" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 553 | depends on X86_64 && X86_MCE && X86_LOCAL_APIC |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 554 | help |
| 555 | Additional support for AMD specific MCE features such as |
| 556 | the DRAM Error Threshold. |
| 557 | |
| 558 | config X86_MCE_NONFATAL |
| 559 | tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4" |
| 560 | depends on X86_32 && X86_MCE |
| 561 | help |
| 562 | Enabling this feature starts a timer that triggers every 5 seconds which |
| 563 | will look at the machine check registers to see if anything happened. |
| 564 | Non-fatal problems automatically get corrected (but still logged). |
| 565 | Disable this if you don't want to see these messages. |
| 566 | Seeing the messages this option prints out may be indicative of dying |
| 567 | or out-of-spec (ie, overclocked) hardware. |
| 568 | This option only does something on certain CPUs. |
| 569 | (AMD Athlon/Duron and Intel Pentium 4) |
| 570 | |
| 571 | config X86_MCE_P4THERMAL |
| 572 | bool "check for P4 thermal throttling interrupt." |
| 573 | depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP) && !X86_VISWS |
| 574 | help |
| 575 | Enabling this feature will cause a message to be printed when the P4 |
| 576 | enters thermal throttling. |
| 577 | |
| 578 | config VM86 |
| 579 | bool "Enable VM86 support" if EMBEDDED |
| 580 | default y |
| 581 | depends on X86_32 |
| 582 | help |
| 583 | This option is required by programs like DOSEMU to run 16-bit legacy |
| 584 | code on X86 processors. It also may be needed by software like |
| 585 | XFree86 to initialize some video cards via BIOS. Disabling this |
| 586 | option saves about 6k. |
| 587 | |
| 588 | config TOSHIBA |
| 589 | tristate "Toshiba Laptop support" |
| 590 | depends on X86_32 |
| 591 | ---help--- |
| 592 | This adds a driver to safely access the System Management Mode of |
| 593 | the CPU on Toshiba portables with a genuine Toshiba BIOS. It does |
| 594 | not work on models with a Phoenix BIOS. The System Management Mode |
| 595 | is used to set the BIOS and power saving options on Toshiba portables. |
| 596 | |
| 597 | For information on utilities to make use of this driver see the |
| 598 | Toshiba Linux utilities web site at: |
| 599 | <http://www.buzzard.org.uk/toshiba/>. |
| 600 | |
| 601 | Say Y if you intend to run this kernel on a Toshiba portable. |
| 602 | Say N otherwise. |
| 603 | |
| 604 | config I8K |
| 605 | tristate "Dell laptop support" |
| 606 | depends on X86_32 |
| 607 | ---help--- |
| 608 | This adds a driver to safely access the System Management Mode |
| 609 | of the CPU on the Dell Inspiron 8000. The System Management Mode |
| 610 | is used to read cpu temperature and cooling fan status and to |
| 611 | control the fans on the I8K portables. |
| 612 | |
| 613 | This driver has been tested only on the Inspiron 8000 but it may |
| 614 | also work with other Dell laptops. You can force loading on other |
| 615 | models by passing the parameter `force=1' to the module. Use at |
| 616 | your own risk. |
| 617 | |
| 618 | For information on utilities to make use of this driver see the |
| 619 | I8K Linux utilities web site at: |
| 620 | <http://people.debian.org/~dz/i8k/> |
| 621 | |
| 622 | Say Y if you intend to run this kernel on a Dell Inspiron 8000. |
| 623 | Say N otherwise. |
| 624 | |
| 625 | config X86_REBOOTFIXUPS |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 626 | def_bool n |
| 627 | prompt "Enable X86 board specific fixups for reboot" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 628 | depends on X86_32 && X86 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 629 | ---help--- |
| 630 | This enables chipset and/or board specific fixups to be done |
| 631 | in order to get reboot to work correctly. This is only needed on |
| 632 | some combinations of hardware and BIOS. The symptom, for which |
| 633 | this config is intended, is when reboot ends with a stalled/hung |
| 634 | system. |
| 635 | |
| 636 | Currently, the only fixup is for the Geode machines using |
| 637 | CS5530A and CS5536 chipsets. |
| 638 | |
| 639 | Say Y if you want to enable the fixup. Currently, it's safe to |
| 640 | enable this option even if you don't need it. |
| 641 | Say N otherwise. |
| 642 | |
| 643 | config MICROCODE |
| 644 | tristate "/dev/cpu/microcode - Intel IA32 CPU microcode support" |
| 645 | select FW_LOADER |
| 646 | ---help--- |
| 647 | If you say Y here, you will be able to update the microcode on |
| 648 | Intel processors in the IA32 family, e.g. Pentium Pro, Pentium II, |
| 649 | Pentium III, Pentium 4, Xeon etc. You will obviously need the |
| 650 | actual microcode binary data itself which is not shipped with the |
| 651 | Linux kernel. |
| 652 | |
| 653 | For latest news and information on obtaining all the required |
| 654 | ingredients for this driver, check: |
| 655 | <http://www.urbanmyth.org/microcode/>. |
| 656 | |
| 657 | To compile this driver as a module, choose M here: the |
| 658 | module will be called microcode. |
| 659 | |
| 660 | config MICROCODE_OLD_INTERFACE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 661 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 662 | depends on MICROCODE |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 663 | |
| 664 | config X86_MSR |
| 665 | tristate "/dev/cpu/*/msr - Model-specific register support" |
| 666 | help |
| 667 | This device gives privileged processes access to the x86 |
| 668 | Model-Specific Registers (MSRs). It is a character device with |
| 669 | major 202 and minors 0 to 31 for /dev/cpu/0/msr to /dev/cpu/31/msr. |
| 670 | MSR accesses are directed to a specific CPU on multi-processor |
| 671 | systems. |
| 672 | |
| 673 | config X86_CPUID |
| 674 | tristate "/dev/cpu/*/cpuid - CPU information support" |
| 675 | help |
| 676 | This device gives processes access to the x86 CPUID instruction to |
| 677 | be executed on a specific processor. It is a character device |
| 678 | with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to |
| 679 | /dev/cpu/31/cpuid. |
| 680 | |
| 681 | choice |
| 682 | prompt "High Memory Support" |
| 683 | default HIGHMEM4G if !X86_NUMAQ |
| 684 | default HIGHMEM64G if X86_NUMAQ |
| 685 | depends on X86_32 |
| 686 | |
| 687 | config NOHIGHMEM |
| 688 | bool "off" |
| 689 | depends on !X86_NUMAQ |
| 690 | ---help--- |
| 691 | Linux can use up to 64 Gigabytes of physical memory on x86 systems. |
| 692 | However, the address space of 32-bit x86 processors is only 4 |
| 693 | Gigabytes large. That means that, if you have a large amount of |
| 694 | physical memory, not all of it can be "permanently mapped" by the |
| 695 | kernel. The physical memory that's not permanently mapped is called |
| 696 | "high memory". |
| 697 | |
| 698 | If you are compiling a kernel which will never run on a machine with |
| 699 | more than 1 Gigabyte total physical RAM, answer "off" here (default |
| 700 | choice and suitable for most users). This will result in a "3GB/1GB" |
| 701 | split: 3GB are mapped so that each process sees a 3GB virtual memory |
| 702 | space and the remaining part of the 4GB virtual memory space is used |
| 703 | by the kernel to permanently map as much physical memory as |
| 704 | possible. |
| 705 | |
| 706 | If the machine has between 1 and 4 Gigabytes physical RAM, then |
| 707 | answer "4GB" here. |
| 708 | |
| 709 | If more than 4 Gigabytes is used then answer "64GB" here. This |
| 710 | selection turns Intel PAE (Physical Address Extension) mode on. |
| 711 | PAE implements 3-level paging on IA32 processors. PAE is fully |
| 712 | supported by Linux, PAE mode is implemented on all recent Intel |
| 713 | processors (Pentium Pro and better). NOTE: If you say "64GB" here, |
| 714 | then the kernel will not boot on CPUs that don't support PAE! |
| 715 | |
| 716 | The actual amount of total physical memory will either be |
| 717 | auto detected or can be forced by using a kernel command line option |
| 718 | such as "mem=256M". (Try "man bootparam" or see the documentation of |
| 719 | your boot loader (lilo or loadlin) about how to pass options to the |
| 720 | kernel at boot time.) |
| 721 | |
| 722 | If unsure, say "off". |
| 723 | |
| 724 | config HIGHMEM4G |
| 725 | bool "4GB" |
| 726 | depends on !X86_NUMAQ |
| 727 | help |
| 728 | Select this if you have a 32-bit processor and between 1 and 4 |
| 729 | gigabytes of physical RAM. |
| 730 | |
| 731 | config HIGHMEM64G |
| 732 | bool "64GB" |
| 733 | depends on !M386 && !M486 |
| 734 | select X86_PAE |
| 735 | help |
| 736 | Select this if you have a 32-bit processor and more than 4 |
| 737 | gigabytes of physical RAM. |
| 738 | |
| 739 | endchoice |
| 740 | |
| 741 | choice |
| 742 | depends on EXPERIMENTAL |
| 743 | prompt "Memory split" if EMBEDDED |
| 744 | default VMSPLIT_3G |
| 745 | depends on X86_32 |
| 746 | help |
| 747 | Select the desired split between kernel and user memory. |
| 748 | |
| 749 | If the address range available to the kernel is less than the |
| 750 | physical memory installed, the remaining memory will be available |
| 751 | as "high memory". Accessing high memory is a little more costly |
| 752 | than low memory, as it needs to be mapped into the kernel first. |
| 753 | Note that increasing the kernel address space limits the range |
| 754 | available to user programs, making the address space there |
| 755 | tighter. Selecting anything other than the default 3G/1G split |
| 756 | will also likely make your kernel incompatible with binary-only |
| 757 | kernel modules. |
| 758 | |
| 759 | If you are not absolutely sure what you are doing, leave this |
| 760 | option alone! |
| 761 | |
| 762 | config VMSPLIT_3G |
| 763 | bool "3G/1G user/kernel split" |
| 764 | config VMSPLIT_3G_OPT |
| 765 | depends on !X86_PAE |
| 766 | bool "3G/1G user/kernel split (for full 1G low memory)" |
| 767 | config VMSPLIT_2G |
| 768 | bool "2G/2G user/kernel split" |
| 769 | config VMSPLIT_2G_OPT |
| 770 | depends on !X86_PAE |
| 771 | bool "2G/2G user/kernel split (for full 2G low memory)" |
| 772 | config VMSPLIT_1G |
| 773 | bool "1G/3G user/kernel split" |
| 774 | endchoice |
| 775 | |
| 776 | config PAGE_OFFSET |
| 777 | hex |
| 778 | default 0xB0000000 if VMSPLIT_3G_OPT |
| 779 | default 0x80000000 if VMSPLIT_2G |
| 780 | default 0x78000000 if VMSPLIT_2G_OPT |
| 781 | default 0x40000000 if VMSPLIT_1G |
| 782 | default 0xC0000000 |
| 783 | depends on X86_32 |
| 784 | |
| 785 | config HIGHMEM |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 786 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 787 | depends on X86_32 && (HIGHMEM64G || HIGHMEM4G) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 788 | |
| 789 | config X86_PAE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 790 | def_bool n |
| 791 | prompt "PAE (Physical Address Extension) Support" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 792 | depends on X86_32 && !HIGHMEM4G |
| 793 | select RESOURCES_64BIT |
| 794 | help |
| 795 | PAE is required for NX support, and furthermore enables |
| 796 | larger swapspace support for non-overcommit purposes. It |
| 797 | has the cost of more pagetable lookup overhead, and also |
| 798 | consumes more pagetable space per process. |
| 799 | |
| 800 | # Common NUMA Features |
| 801 | config NUMA |
| 802 | bool "Numa Memory Allocation and Scheduler Support (EXPERIMENTAL)" |
| 803 | depends on SMP |
| 804 | depends on X86_64 || (X86_32 && HIGHMEM64G && (X86_NUMAQ || (X86_SUMMIT || X86_GENERICARCH) && ACPI) && EXPERIMENTAL) |
| 805 | default n if X86_PC |
| 806 | default y if (X86_NUMAQ || X86_SUMMIT) |
| 807 | help |
| 808 | Enable NUMA (Non Uniform Memory Access) support. |
| 809 | The kernel will try to allocate memory used by a CPU on the |
| 810 | local memory controller of the CPU and add some more |
| 811 | NUMA awareness to the kernel. |
| 812 | |
| 813 | For i386 this is currently highly experimental and should be only |
| 814 | used for kernel development. It might also cause boot failures. |
| 815 | For x86_64 this is recommended on all multiprocessor Opteron systems. |
| 816 | If the system is EM64T, you should say N unless your system is |
| 817 | EM64T NUMA. |
| 818 | |
| 819 | comment "NUMA (Summit) requires SMP, 64GB highmem support, ACPI" |
| 820 | depends on X86_32 && X86_SUMMIT && (!HIGHMEM64G || !ACPI) |
| 821 | |
| 822 | config K8_NUMA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 823 | def_bool y |
| 824 | prompt "Old style AMD Opteron NUMA detection" |
| 825 | depends on X86_64 && NUMA && PCI |
| 826 | help |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 827 | Enable K8 NUMA node topology detection. You should say Y here if |
| 828 | you have a multi processor AMD K8 system. This uses an old |
| 829 | method to read the NUMA configuration directly from the builtin |
| 830 | Northbridge of Opteron. It is recommended to use X86_64_ACPI_NUMA |
| 831 | instead, which also takes priority if both are compiled in. |
| 832 | |
| 833 | config X86_64_ACPI_NUMA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 834 | def_bool y |
| 835 | prompt "ACPI NUMA detection" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 836 | depends on X86_64 && NUMA && ACPI && PCI |
| 837 | select ACPI_NUMA |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 838 | help |
| 839 | Enable ACPI SRAT based node topology detection. |
| 840 | |
| 841 | config NUMA_EMU |
| 842 | bool "NUMA emulation" |
| 843 | depends on X86_64 && NUMA |
| 844 | help |
| 845 | Enable NUMA emulation. A flat machine will be split |
| 846 | into virtual nodes when booted with "numa=fake=N", where N is the |
| 847 | number of nodes. This is only useful for debugging. |
| 848 | |
| 849 | config NODES_SHIFT |
| 850 | int |
travis@sgi.com | 4323838 | 2008-01-30 13:33:25 +0100 | [diff] [blame] | 851 | range 1 15 if X86_64 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 852 | default "6" if X86_64 |
| 853 | default "4" if X86_NUMAQ |
| 854 | default "3" |
| 855 | depends on NEED_MULTIPLE_NODES |
| 856 | |
| 857 | config HAVE_ARCH_BOOTMEM_NODE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 858 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 859 | depends on X86_32 && NUMA |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 860 | |
| 861 | config ARCH_HAVE_MEMORY_PRESENT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 862 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 863 | depends on X86_32 && DISCONTIGMEM |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 864 | |
| 865 | config NEED_NODE_MEMMAP_SIZE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 866 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 867 | depends on X86_32 && (DISCONTIGMEM || SPARSEMEM) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 868 | |
| 869 | config HAVE_ARCH_ALLOC_REMAP |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 870 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 871 | depends on X86_32 && NUMA |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 872 | |
| 873 | config ARCH_FLATMEM_ENABLE |
| 874 | def_bool y |
Mel Gorman | 409a7b8 | 2008-01-30 13:33:25 +0100 | [diff] [blame] | 875 | depends on X86_32 && ARCH_SELECT_MEMORY_MODEL && X86_PC && !NUMA |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 876 | |
| 877 | config ARCH_DISCONTIGMEM_ENABLE |
| 878 | def_bool y |
Christoph Lameter | b263295 | 2008-01-30 13:30:47 +0100 | [diff] [blame] | 879 | depends on NUMA && X86_32 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 880 | |
| 881 | config ARCH_DISCONTIGMEM_DEFAULT |
| 882 | def_bool y |
Christoph Lameter | b263295 | 2008-01-30 13:30:47 +0100 | [diff] [blame] | 883 | depends on NUMA && X86_32 |
| 884 | |
| 885 | config ARCH_SPARSEMEM_DEFAULT |
| 886 | def_bool y |
| 887 | depends on X86_64 |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 888 | |
| 889 | config ARCH_SPARSEMEM_ENABLE |
| 890 | def_bool y |
Christoph Lameter | b263295 | 2008-01-30 13:30:47 +0100 | [diff] [blame] | 891 | depends on X86_64 || NUMA || (EXPERIMENTAL && X86_PC) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 892 | select SPARSEMEM_STATIC if X86_32 |
| 893 | select SPARSEMEM_VMEMMAP_ENABLE if X86_64 |
| 894 | |
| 895 | config ARCH_SELECT_MEMORY_MODEL |
| 896 | def_bool y |
Christoph Lameter | b263295 | 2008-01-30 13:30:47 +0100 | [diff] [blame] | 897 | depends on ARCH_SPARSEMEM_ENABLE |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 898 | |
| 899 | config ARCH_MEMORY_PROBE |
| 900 | def_bool X86_64 |
| 901 | depends on MEMORY_HOTPLUG |
| 902 | |
| 903 | source "mm/Kconfig" |
| 904 | |
| 905 | config HIGHPTE |
| 906 | bool "Allocate 3rd-level pagetables from highmem" |
| 907 | depends on X86_32 && (HIGHMEM4G || HIGHMEM64G) |
| 908 | help |
| 909 | The VM uses one page table entry for each page of physical memory. |
| 910 | For systems with a lot of RAM, this can be wasteful of precious |
| 911 | low memory. Setting this option will put user-space page table |
| 912 | entries in high memory. |
| 913 | |
| 914 | config MATH_EMULATION |
| 915 | bool |
| 916 | prompt "Math emulation" if X86_32 |
| 917 | ---help--- |
| 918 | Linux can emulate a math coprocessor (used for floating point |
| 919 | operations) if you don't have one. 486DX and Pentium processors have |
| 920 | a math coprocessor built in, 486SX and 386 do not, unless you added |
| 921 | a 487DX or 387, respectively. (The messages during boot time can |
| 922 | give you some hints here ["man dmesg"].) Everyone needs either a |
| 923 | coprocessor or this emulation. |
| 924 | |
| 925 | If you don't have a math coprocessor, you need to say Y here; if you |
| 926 | say Y here even though you have a coprocessor, the coprocessor will |
| 927 | be used nevertheless. (This behavior can be changed with the kernel |
| 928 | command line option "no387", which comes handy if your coprocessor |
| 929 | is broken. Try "man bootparam" or see the documentation of your boot |
| 930 | loader (lilo or loadlin) about how to pass options to the kernel at |
| 931 | boot time.) This means that it is a good idea to say Y here if you |
| 932 | intend to use this kernel on different machines. |
| 933 | |
| 934 | More information about the internals of the Linux math coprocessor |
| 935 | emulation can be found in <file:arch/x86/math-emu/README>. |
| 936 | |
| 937 | If you are not sure, say Y; apart from resulting in a 66 KB bigger |
| 938 | kernel, it won't hurt. |
| 939 | |
| 940 | config MTRR |
| 941 | bool "MTRR (Memory Type Range Register) support" |
| 942 | ---help--- |
| 943 | On Intel P6 family processors (Pentium Pro, Pentium II and later) |
| 944 | the Memory Type Range Registers (MTRRs) may be used to control |
| 945 | processor access to memory ranges. This is most useful if you have |
| 946 | a video (VGA) card on a PCI or AGP bus. Enabling write-combining |
| 947 | allows bus write transfers to be combined into a larger transfer |
| 948 | before bursting over the PCI/AGP bus. This can increase performance |
| 949 | of image write operations 2.5 times or more. Saying Y here creates a |
| 950 | /proc/mtrr file which may be used to manipulate your processor's |
| 951 | MTRRs. Typically the X server should use this. |
| 952 | |
| 953 | This code has a reasonably generic interface so that similar |
| 954 | control registers on other processors can be easily supported |
| 955 | as well: |
| 956 | |
| 957 | The Cyrix 6x86, 6x86MX and M II processors have Address Range |
| 958 | Registers (ARRs) which provide a similar functionality to MTRRs. For |
| 959 | these, the ARRs are used to emulate the MTRRs. |
| 960 | The AMD K6-2 (stepping 8 and above) and K6-3 processors have two |
| 961 | MTRRs. The Centaur C6 (WinChip) has 8 MCRs, allowing |
| 962 | write-combining. All of these processors are supported by this code |
| 963 | and it makes sense to say Y here if you have one of them. |
| 964 | |
| 965 | Saying Y here also fixes a problem with buggy SMP BIOSes which only |
| 966 | set the MTRRs for the boot CPU and not for the secondary CPUs. This |
| 967 | can lead to all sorts of problems, so it's good to say Y here. |
| 968 | |
| 969 | You can safely say Y even if your machine doesn't have MTRRs, you'll |
| 970 | just add about 9 KB to your kernel. |
| 971 | |
| 972 | See <file:Documentation/mtrr.txt> for more information. |
| 973 | |
| 974 | config EFI |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 975 | def_bool n |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 976 | prompt "EFI runtime service support" |
Huang, Ying | 5b83683 | 2008-01-30 13:31:19 +0100 | [diff] [blame] | 977 | depends on ACPI |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 978 | ---help--- |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 979 | This enables the kernel to use EFI runtime services that are |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 980 | available (such as the EFI variable services). |
| 981 | |
Huang, Ying | 8b2cb7a | 2008-01-30 13:32:11 +0100 | [diff] [blame] | 982 | This option is only useful on systems that have EFI firmware. |
| 983 | In addition, you should use the latest ELILO loader available |
| 984 | at <http://elilo.sourceforge.net> in order to take advantage |
| 985 | of EFI runtime services. However, even with this option, the |
| 986 | resultant kernel should continue to boot on existing non-EFI |
| 987 | platforms. |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 988 | |
| 989 | config IRQBALANCE |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 990 | def_bool y |
| 991 | prompt "Enable kernel irq balancing" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 992 | depends on X86_32 && SMP && X86_IO_APIC |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 993 | help |
| 994 | The default yes will allow the kernel to do irq load balancing. |
| 995 | Saying no will keep the kernel from doing irq load balancing. |
| 996 | |
| 997 | # turning this on wastes a bunch of space. |
| 998 | # Summit needs it only when NUMA is on |
| 999 | config BOOT_IOREMAP |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1000 | def_bool y |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1001 | depends on X86_32 && (((X86_SUMMIT || X86_GENERICARCH) && NUMA) || (X86 && EFI)) |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1002 | |
| 1003 | config SECCOMP |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1004 | def_bool y |
| 1005 | prompt "Enable seccomp to safely compute untrusted bytecode" |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1006 | depends on PROC_FS |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1007 | help |
| 1008 | This kernel feature is useful for number crunching applications |
| 1009 | that may need to compute untrusted bytecode during their |
| 1010 | execution. By using pipes or other transports made available to |
| 1011 | the process as file descriptors supporting the read/write |
| 1012 | syscalls, it's possible to isolate those applications in |
| 1013 | their own address space using seccomp. Once seccomp is |
| 1014 | enabled via /proc/<pid>/seccomp, it cannot be disabled |
| 1015 | and the task is only allowed to execute a few safe syscalls |
| 1016 | defined by each seccomp mode. |
| 1017 | |
| 1018 | If unsure, say Y. Only embedded should say N here. |
| 1019 | |
| 1020 | config CC_STACKPROTECTOR |
| 1021 | bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)" |
| 1022 | depends on X86_64 && EXPERIMENTAL |
| 1023 | help |
| 1024 | This option turns on the -fstack-protector GCC feature. This |
| 1025 | feature puts, at the beginning of critical functions, a canary |
| 1026 | value on the stack just before the return address, and validates |
| 1027 | the value just before actually returning. Stack based buffer |
| 1028 | overflows (that need to overwrite this return address) now also |
| 1029 | overwrite the canary, which gets detected and the attack is then |
| 1030 | neutralized via a kernel panic. |
| 1031 | |
| 1032 | This feature requires gcc version 4.2 or above, or a distribution |
| 1033 | gcc with the feature backported. Older versions are automatically |
| 1034 | detected and for those versions, this configuration option is ignored. |
| 1035 | |
| 1036 | config CC_STACKPROTECTOR_ALL |
| 1037 | bool "Use stack-protector for all functions" |
| 1038 | depends on CC_STACKPROTECTOR |
| 1039 | help |
| 1040 | Normally, GCC only inserts the canary value protection for |
| 1041 | functions that use large-ish on-stack buffers. By enabling |
| 1042 | this option, GCC will be asked to do this for ALL functions. |
| 1043 | |
| 1044 | source kernel/Kconfig.hz |
| 1045 | |
| 1046 | config KEXEC |
| 1047 | bool "kexec system call" |
| 1048 | help |
| 1049 | kexec is a system call that implements the ability to shutdown your |
| 1050 | current kernel, and to start another kernel. It is like a reboot |
| 1051 | but it is independent of the system firmware. And like a reboot |
| 1052 | you can start any kernel with it, not just Linux. |
| 1053 | |
| 1054 | The name comes from the similarity to the exec system call. |
| 1055 | |
| 1056 | It is an ongoing process to be certain the hardware in a machine |
| 1057 | is properly shutdown, so do not be surprised if this code does not |
| 1058 | initially work for you. It may help to enable device hotplugging |
| 1059 | support. As of this writing the exact hardware interface is |
| 1060 | strongly in flux, so no good recommendation can be made. |
| 1061 | |
| 1062 | config CRASH_DUMP |
| 1063 | bool "kernel crash dumps (EXPERIMENTAL)" |
| 1064 | depends on EXPERIMENTAL |
| 1065 | depends on X86_64 || (X86_32 && HIGHMEM) |
| 1066 | help |
| 1067 | Generate crash dump after being started by kexec. |
| 1068 | This should be normally only set in special crash dump kernels |
| 1069 | which are loaded in the main kernel with kexec-tools into |
| 1070 | a specially reserved region and then later executed after |
| 1071 | a crash by kdump/kexec. The crash dump kernel must be compiled |
| 1072 | to a memory address not used by the main kernel or BIOS using |
| 1073 | PHYSICAL_START, or it must be built as a relocatable image |
| 1074 | (CONFIG_RELOCATABLE=y). |
| 1075 | For more details see Documentation/kdump/kdump.txt |
| 1076 | |
| 1077 | config PHYSICAL_START |
| 1078 | hex "Physical address where the kernel is loaded" if (EMBEDDED || CRASH_DUMP) |
| 1079 | default "0x1000000" if X86_NUMAQ |
| 1080 | default "0x200000" if X86_64 |
| 1081 | default "0x100000" |
| 1082 | help |
| 1083 | This gives the physical address where the kernel is loaded. |
| 1084 | |
| 1085 | If kernel is a not relocatable (CONFIG_RELOCATABLE=n) then |
| 1086 | bzImage will decompress itself to above physical address and |
| 1087 | run from there. Otherwise, bzImage will run from the address where |
| 1088 | it has been loaded by the boot loader and will ignore above physical |
| 1089 | address. |
| 1090 | |
| 1091 | In normal kdump cases one does not have to set/change this option |
| 1092 | as now bzImage can be compiled as a completely relocatable image |
| 1093 | (CONFIG_RELOCATABLE=y) and be used to load and run from a different |
| 1094 | address. This option is mainly useful for the folks who don't want |
| 1095 | to use a bzImage for capturing the crash dump and want to use a |
| 1096 | vmlinux instead. vmlinux is not relocatable hence a kernel needs |
| 1097 | to be specifically compiled to run from a specific memory area |
| 1098 | (normally a reserved region) and this option comes handy. |
| 1099 | |
| 1100 | So if you are using bzImage for capturing the crash dump, leave |
| 1101 | the value here unchanged to 0x100000 and set CONFIG_RELOCATABLE=y. |
| 1102 | Otherwise if you plan to use vmlinux for capturing the crash dump |
| 1103 | change this value to start of the reserved region (Typically 16MB |
| 1104 | 0x1000000). In other words, it can be set based on the "X" value as |
| 1105 | specified in the "crashkernel=YM@XM" command line boot parameter |
| 1106 | passed to the panic-ed kernel. Typically this parameter is set as |
| 1107 | crashkernel=64M@16M. Please take a look at |
| 1108 | Documentation/kdump/kdump.txt for more details about crash dumps. |
| 1109 | |
| 1110 | Usage of bzImage for capturing the crash dump is recommended as |
| 1111 | one does not have to build two kernels. Same kernel can be used |
| 1112 | as production kernel and capture kernel. Above option should have |
| 1113 | gone away after relocatable bzImage support is introduced. But it |
| 1114 | is present because there are users out there who continue to use |
| 1115 | vmlinux for dump capture. This option should go away down the |
| 1116 | line. |
| 1117 | |
| 1118 | Don't change this unless you know what you are doing. |
| 1119 | |
| 1120 | config RELOCATABLE |
| 1121 | bool "Build a relocatable kernel (EXPERIMENTAL)" |
| 1122 | depends on EXPERIMENTAL |
| 1123 | help |
| 1124 | This builds a kernel image that retains relocation information |
| 1125 | so it can be loaded someplace besides the default 1MB. |
| 1126 | The relocations tend to make the kernel binary about 10% larger, |
| 1127 | but are discarded at runtime. |
| 1128 | |
| 1129 | One use is for the kexec on panic case where the recovery kernel |
| 1130 | must live at a different physical address than the primary |
| 1131 | kernel. |
| 1132 | |
| 1133 | Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address |
| 1134 | it has been loaded at and the compile time physical address |
| 1135 | (CONFIG_PHYSICAL_START) is ignored. |
| 1136 | |
| 1137 | config PHYSICAL_ALIGN |
| 1138 | hex |
| 1139 | prompt "Alignment value to which kernel should be aligned" if X86_32 |
| 1140 | default "0x100000" if X86_32 |
| 1141 | default "0x200000" if X86_64 |
| 1142 | range 0x2000 0x400000 |
| 1143 | help |
| 1144 | This value puts the alignment restrictions on physical address |
| 1145 | where kernel is loaded and run from. Kernel is compiled for an |
| 1146 | address which meets above alignment restriction. |
| 1147 | |
| 1148 | If bootloader loads the kernel at a non-aligned address and |
| 1149 | CONFIG_RELOCATABLE is set, kernel will move itself to nearest |
| 1150 | address aligned to above value and run from there. |
| 1151 | |
| 1152 | If bootloader loads the kernel at a non-aligned address and |
| 1153 | CONFIG_RELOCATABLE is not set, kernel will ignore the run time |
| 1154 | load address and decompress itself to the address it has been |
| 1155 | compiled for and run from there. The address for which kernel is |
| 1156 | compiled already meets above alignment restrictions. Hence the |
| 1157 | end result is that kernel runs from a physical address meeting |
| 1158 | above alignment restrictions. |
| 1159 | |
| 1160 | Don't change this unless you know what you are doing. |
| 1161 | |
| 1162 | config HOTPLUG_CPU |
| 1163 | bool "Support for suspend on SMP and hot-pluggable CPUs (EXPERIMENTAL)" |
| 1164 | depends on SMP && HOTPLUG && EXPERIMENTAL && !X86_VOYAGER |
| 1165 | ---help--- |
| 1166 | Say Y here to experiment with turning CPUs off and on, and to |
| 1167 | enable suspend on SMP systems. CPUs can be controlled through |
| 1168 | /sys/devices/system/cpu. |
| 1169 | Say N if you want to disable CPU hotplug and don't need to |
| 1170 | suspend. |
| 1171 | |
| 1172 | config COMPAT_VDSO |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1173 | def_bool y |
| 1174 | prompt "Compat VDSO support" |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 1175 | depends on X86_32 || IA32_EMULATION |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1176 | help |
Roland McGrath | af65d64 | 2008-01-30 13:30:43 +0100 | [diff] [blame] | 1177 | Map the 32-bit VDSO to the predictable old-style address too. |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1178 | ---help--- |
| 1179 | Say N here if you are running a sufficiently recent glibc |
| 1180 | version (2.3.3 or later), to remove the high-mapped |
| 1181 | VDSO mapping and to exclusively use the randomized VDSO. |
| 1182 | |
| 1183 | If unsure, say Y. |
| 1184 | |
| 1185 | endmenu |
| 1186 | |
| 1187 | config ARCH_ENABLE_MEMORY_HOTPLUG |
| 1188 | def_bool y |
| 1189 | depends on X86_64 || (X86_32 && HIGHMEM) |
| 1190 | |
Sam Ravnborg | 506f1d0 | 2007-11-09 21:56:54 +0100 | [diff] [blame] | 1191 | config HAVE_ARCH_EARLY_PFN_TO_NID |
| 1192 | def_bool X86_64 |
| 1193 | depends on NUMA |
| 1194 | |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1195 | menu "Power management options" |
| 1196 | depends on !X86_VOYAGER |
| 1197 | |
| 1198 | config ARCH_HIBERNATION_HEADER |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1199 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1200 | depends on X86_64 && HIBERNATION |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1201 | |
| 1202 | source "kernel/power/Kconfig" |
| 1203 | |
| 1204 | source "drivers/acpi/Kconfig" |
| 1205 | |
Andi Kleen | a6b6807 | 2008-01-30 13:32:49 +0100 | [diff] [blame] | 1206 | config X86_APM_BOOT |
| 1207 | bool |
| 1208 | default y |
| 1209 | depends on APM || APM_MODULE |
| 1210 | |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1211 | menuconfig APM |
| 1212 | tristate "APM (Advanced Power Management) BIOS support" |
| 1213 | depends on X86_32 && PM_SLEEP && !X86_VISWS |
| 1214 | ---help--- |
| 1215 | APM is a BIOS specification for saving power using several different |
| 1216 | techniques. This is mostly useful for battery powered laptops with |
| 1217 | APM compliant BIOSes. If you say Y here, the system time will be |
| 1218 | reset after a RESUME operation, the /proc/apm device will provide |
| 1219 | battery status information, and user-space programs will receive |
| 1220 | notification of APM "events" (e.g. battery status change). |
| 1221 | |
| 1222 | If you select "Y" here, you can disable actual use of the APM |
| 1223 | BIOS by passing the "apm=off" option to the kernel at boot time. |
| 1224 | |
| 1225 | Note that the APM support is almost completely disabled for |
| 1226 | machines with more than one CPU. |
| 1227 | |
| 1228 | In order to use APM, you will need supporting software. For location |
| 1229 | and more information, read <file:Documentation/pm.txt> and the |
| 1230 | Battery Powered Linux mini-HOWTO, available from |
| 1231 | <http://www.tldp.org/docs.html#howto>. |
| 1232 | |
| 1233 | This driver does not spin down disk drives (see the hdparm(8) |
| 1234 | manpage ("man 8 hdparm") for that), and it doesn't turn off |
| 1235 | VESA-compliant "green" monitors. |
| 1236 | |
| 1237 | This driver does not support the TI 4000M TravelMate and the ACER |
| 1238 | 486/DX4/75 because they don't have compliant BIOSes. Many "green" |
| 1239 | desktop machines also don't have compliant BIOSes, and this driver |
| 1240 | may cause those machines to panic during the boot phase. |
| 1241 | |
| 1242 | Generally, if you don't have a battery in your machine, there isn't |
| 1243 | much point in using this driver and you should say N. If you get |
| 1244 | random kernel OOPSes or reboots that don't seem to be related to |
| 1245 | anything, try disabling/enabling this option (or disabling/enabling |
| 1246 | APM in your BIOS). |
| 1247 | |
| 1248 | Some other things you should try when experiencing seemingly random, |
| 1249 | "weird" problems: |
| 1250 | |
| 1251 | 1) make sure that you have enough swap space and that it is |
| 1252 | enabled. |
| 1253 | 2) pass the "no-hlt" option to the kernel |
| 1254 | 3) switch on floating point emulation in the kernel and pass |
| 1255 | the "no387" option to the kernel |
| 1256 | 4) pass the "floppy=nodma" option to the kernel |
| 1257 | 5) pass the "mem=4M" option to the kernel (thereby disabling |
| 1258 | all but the first 4 MB of RAM) |
| 1259 | 6) make sure that the CPU is not over clocked. |
| 1260 | 7) read the sig11 FAQ at <http://www.bitwizard.nl/sig11/> |
| 1261 | 8) disable the cache from your BIOS settings |
| 1262 | 9) install a fan for the video card or exchange video RAM |
| 1263 | 10) install a better fan for the CPU |
| 1264 | 11) exchange RAM chips |
| 1265 | 12) exchange the motherboard. |
| 1266 | |
| 1267 | To compile this driver as a module, choose M here: the |
| 1268 | module will be called apm. |
| 1269 | |
| 1270 | if APM |
| 1271 | |
| 1272 | config APM_IGNORE_USER_SUSPEND |
| 1273 | bool "Ignore USER SUSPEND" |
| 1274 | help |
| 1275 | This option will ignore USER SUSPEND requests. On machines with a |
| 1276 | compliant APM BIOS, you want to say N. However, on the NEC Versa M |
| 1277 | series notebooks, it is necessary to say Y because of a BIOS bug. |
| 1278 | |
| 1279 | config APM_DO_ENABLE |
| 1280 | bool "Enable PM at boot time" |
| 1281 | ---help--- |
| 1282 | Enable APM features at boot time. From page 36 of the APM BIOS |
| 1283 | specification: "When disabled, the APM BIOS does not automatically |
| 1284 | power manage devices, enter the Standby State, enter the Suspend |
| 1285 | State, or take power saving steps in response to CPU Idle calls." |
| 1286 | This driver will make CPU Idle calls when Linux is idle (unless this |
| 1287 | feature is turned off -- see "Do CPU IDLE calls", below). This |
| 1288 | should always save battery power, but more complicated APM features |
| 1289 | will be dependent on your BIOS implementation. You may need to turn |
| 1290 | this option off if your computer hangs at boot time when using APM |
| 1291 | support, or if it beeps continuously instead of suspending. Turn |
| 1292 | this off if you have a NEC UltraLite Versa 33/C or a Toshiba |
| 1293 | T400CDT. This is off by default since most machines do fine without |
| 1294 | this feature. |
| 1295 | |
| 1296 | config APM_CPU_IDLE |
| 1297 | bool "Make CPU Idle calls when idle" |
| 1298 | help |
| 1299 | Enable calls to APM CPU Idle/CPU Busy inside the kernel's idle loop. |
| 1300 | On some machines, this can activate improved power savings, such as |
| 1301 | a slowed CPU clock rate, when the machine is idle. These idle calls |
| 1302 | are made after the idle loop has run for some length of time (e.g., |
| 1303 | 333 mS). On some machines, this will cause a hang at boot time or |
| 1304 | whenever the CPU becomes idle. (On machines with more than one CPU, |
| 1305 | this option does nothing.) |
| 1306 | |
| 1307 | config APM_DISPLAY_BLANK |
| 1308 | bool "Enable console blanking using APM" |
| 1309 | help |
| 1310 | Enable console blanking using the APM. Some laptops can use this to |
| 1311 | turn off the LCD backlight when the screen blanker of the Linux |
| 1312 | virtual console blanks the screen. Note that this is only used by |
| 1313 | the virtual console screen blanker, and won't turn off the backlight |
| 1314 | when using the X Window system. This also doesn't have anything to |
| 1315 | do with your VESA-compliant power-saving monitor. Further, this |
| 1316 | option doesn't work for all laptops -- it might not turn off your |
| 1317 | backlight at all, or it might print a lot of errors to the console, |
| 1318 | especially if you are using gpm. |
| 1319 | |
| 1320 | config APM_ALLOW_INTS |
| 1321 | bool "Allow interrupts during APM BIOS calls" |
| 1322 | help |
| 1323 | Normally we disable external interrupts while we are making calls to |
| 1324 | the APM BIOS as a measure to lessen the effects of a badly behaving |
| 1325 | BIOS implementation. The BIOS should reenable interrupts if it |
| 1326 | needs to. Unfortunately, some BIOSes do not -- especially those in |
| 1327 | many of the newer IBM Thinkpads. If you experience hangs when you |
| 1328 | suspend, try setting this to Y. Otherwise, say N. |
| 1329 | |
| 1330 | config APM_REAL_MODE_POWER_OFF |
| 1331 | bool "Use real mode APM BIOS call to power off" |
| 1332 | help |
| 1333 | Use real mode APM BIOS calls to switch off the computer. This is |
| 1334 | a work-around for a number of buggy BIOSes. Switch this option on if |
| 1335 | your computer crashes instead of powering off properly. |
| 1336 | |
| 1337 | endif # APM |
| 1338 | |
| 1339 | source "arch/x86/kernel/cpu/cpufreq/Kconfig" |
| 1340 | |
| 1341 | source "drivers/cpuidle/Kconfig" |
| 1342 | |
| 1343 | endmenu |
| 1344 | |
| 1345 | |
| 1346 | menu "Bus options (PCI etc.)" |
| 1347 | |
| 1348 | config PCI |
| 1349 | bool "PCI support" if !X86_VISWS |
| 1350 | depends on !X86_VOYAGER |
Adrian Bunk | 1c85808 | 2008-01-30 13:32:32 +0100 | [diff] [blame] | 1351 | default y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1352 | select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC) |
| 1353 | help |
| 1354 | Find out whether you have a PCI motherboard. PCI is the name of a |
| 1355 | bus system, i.e. the way the CPU talks to the other stuff inside |
| 1356 | your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or |
| 1357 | VESA. If you have PCI, say Y, otherwise N. |
| 1358 | |
| 1359 | The PCI-HOWTO, available from |
| 1360 | <http://www.tldp.org/docs.html#howto>, contains valuable |
| 1361 | information about which PCI hardware does work under Linux and which |
| 1362 | doesn't. |
| 1363 | |
| 1364 | choice |
| 1365 | prompt "PCI access mode" |
| 1366 | depends on X86_32 && PCI && !X86_VISWS |
| 1367 | default PCI_GOANY |
| 1368 | ---help--- |
| 1369 | On PCI systems, the BIOS can be used to detect the PCI devices and |
| 1370 | determine their configuration. However, some old PCI motherboards |
| 1371 | have BIOS bugs and may crash if this is done. Also, some embedded |
| 1372 | PCI-based systems don't have any BIOS at all. Linux can also try to |
| 1373 | detect the PCI hardware directly without using the BIOS. |
| 1374 | |
| 1375 | With this option, you can specify how Linux should detect the |
| 1376 | PCI devices. If you choose "BIOS", the BIOS will be used, |
| 1377 | if you choose "Direct", the BIOS won't be used, and if you |
| 1378 | choose "MMConfig", then PCI Express MMCONFIG will be used. |
| 1379 | If you choose "Any", the kernel will try MMCONFIG, then the |
| 1380 | direct access method and falls back to the BIOS if that doesn't |
| 1381 | work. If unsure, go with the default, which is "Any". |
| 1382 | |
| 1383 | config PCI_GOBIOS |
| 1384 | bool "BIOS" |
| 1385 | |
| 1386 | config PCI_GOMMCONFIG |
| 1387 | bool "MMConfig" |
| 1388 | |
| 1389 | config PCI_GODIRECT |
| 1390 | bool "Direct" |
| 1391 | |
| 1392 | config PCI_GOANY |
| 1393 | bool "Any" |
| 1394 | |
| 1395 | endchoice |
| 1396 | |
| 1397 | config PCI_BIOS |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1398 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1399 | depends on X86_32 && !X86_VISWS && PCI && (PCI_GOBIOS || PCI_GOANY) |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1400 | |
| 1401 | # x86-64 doesn't support PCI BIOS access from long mode so always go direct. |
| 1402 | config PCI_DIRECT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1403 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1404 | depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY) || X86_VISWS) |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1405 | |
| 1406 | config PCI_MMCONFIG |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1407 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1408 | depends on X86_32 && PCI && ACPI && (PCI_GOMMCONFIG || PCI_GOANY) |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1409 | |
| 1410 | config PCI_DOMAINS |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1411 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1412 | depends on PCI |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1413 | |
| 1414 | config PCI_MMCONFIG |
| 1415 | bool "Support mmconfig PCI config space access" |
| 1416 | depends on X86_64 && PCI && ACPI |
| 1417 | |
| 1418 | config DMAR |
| 1419 | bool "Support for DMA Remapping Devices (EXPERIMENTAL)" |
| 1420 | depends on X86_64 && PCI_MSI && ACPI && EXPERIMENTAL |
| 1421 | help |
| 1422 | DMA remapping (DMAR) devices support enables independent address |
| 1423 | translations for Direct Memory Access (DMA) from devices. |
| 1424 | These DMA remapping devices are reported via ACPI tables |
| 1425 | and include PCI device scope covered by these DMA |
| 1426 | remapping devices. |
| 1427 | |
| 1428 | config DMAR_GFX_WA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1429 | def_bool y |
| 1430 | prompt "Support for Graphics workaround" |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1431 | depends on DMAR |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1432 | help |
| 1433 | Current Graphics drivers tend to use physical address |
| 1434 | for DMA and avoid using DMA APIs. Setting this config |
| 1435 | option permits the IOMMU driver to set a unity map for |
| 1436 | all the OS-visible memory. Hence the driver can continue |
| 1437 | to use physical addresses for DMA. |
| 1438 | |
| 1439 | config DMAR_FLOPPY_WA |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1440 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1441 | depends on DMAR |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1442 | help |
| 1443 | Floppy disk drivers are know to bypass DMA API calls |
| 1444 | thereby failing to work when IOMMU is enabled. This |
| 1445 | workaround will setup a 1:1 mapping for the first |
| 1446 | 16M to make floppy (an ISA device) work. |
| 1447 | |
| 1448 | source "drivers/pci/pcie/Kconfig" |
| 1449 | |
| 1450 | source "drivers/pci/Kconfig" |
| 1451 | |
| 1452 | # x86_64 have no ISA slots, but do have ISA-style DMA. |
| 1453 | config ISA_DMA_API |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1454 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1455 | |
| 1456 | if X86_32 |
| 1457 | |
| 1458 | config ISA |
| 1459 | bool "ISA support" |
| 1460 | depends on !(X86_VOYAGER || X86_VISWS) |
| 1461 | help |
| 1462 | Find out whether you have ISA slots on your motherboard. ISA is the |
| 1463 | name of a bus system, i.e. the way the CPU talks to the other stuff |
| 1464 | inside your box. Other bus systems are PCI, EISA, MicroChannel |
| 1465 | (MCA) or VESA. ISA is an older system, now being displaced by PCI; |
| 1466 | newer boards don't support it. If you have ISA, say Y, otherwise N. |
| 1467 | |
| 1468 | config EISA |
| 1469 | bool "EISA support" |
| 1470 | depends on ISA |
| 1471 | ---help--- |
| 1472 | The Extended Industry Standard Architecture (EISA) bus was |
| 1473 | developed as an open alternative to the IBM MicroChannel bus. |
| 1474 | |
| 1475 | The EISA bus provided some of the features of the IBM MicroChannel |
| 1476 | bus while maintaining backward compatibility with cards made for |
| 1477 | the older ISA bus. The EISA bus saw limited use between 1988 and |
| 1478 | 1995 when it was made obsolete by the PCI bus. |
| 1479 | |
| 1480 | Say Y here if you are building a kernel for an EISA-based machine. |
| 1481 | |
| 1482 | Otherwise, say N. |
| 1483 | |
| 1484 | source "drivers/eisa/Kconfig" |
| 1485 | |
| 1486 | config MCA |
| 1487 | bool "MCA support" if !(X86_VISWS || X86_VOYAGER) |
| 1488 | default y if X86_VOYAGER |
| 1489 | help |
| 1490 | MicroChannel Architecture is found in some IBM PS/2 machines and |
| 1491 | laptops. It is a bus system similar to PCI or ISA. See |
| 1492 | <file:Documentation/mca.txt> (and especially the web page given |
| 1493 | there) before attempting to build an MCA bus kernel. |
| 1494 | |
| 1495 | source "drivers/mca/Kconfig" |
| 1496 | |
| 1497 | config SCx200 |
| 1498 | tristate "NatSemi SCx200 support" |
| 1499 | depends on !X86_VOYAGER |
| 1500 | help |
| 1501 | This provides basic support for National Semiconductor's |
| 1502 | (now AMD's) Geode processors. The driver probes for the |
| 1503 | PCI-IDs of several on-chip devices, so its a good dependency |
| 1504 | for other scx200_* drivers. |
| 1505 | |
| 1506 | If compiled as a module, the driver is named scx200. |
| 1507 | |
| 1508 | config SCx200HR_TIMER |
| 1509 | tristate "NatSemi SCx200 27MHz High-Resolution Timer Support" |
| 1510 | depends on SCx200 && GENERIC_TIME |
| 1511 | default y |
| 1512 | help |
| 1513 | This driver provides a clocksource built upon the on-chip |
| 1514 | 27MHz high-resolution timer. Its also a workaround for |
| 1515 | NSC Geode SC-1100's buggy TSC, which loses time when the |
| 1516 | processor goes idle (as is done by the scheduler). The |
| 1517 | other workaround is idle=poll boot option. |
| 1518 | |
| 1519 | config GEODE_MFGPT_TIMER |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1520 | def_bool y |
| 1521 | prompt "Geode Multi-Function General Purpose Timer (MFGPT) events" |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1522 | depends on MGEODE_LX && GENERIC_TIME && GENERIC_CLOCKEVENTS |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1523 | help |
| 1524 | This driver provides a clock event source based on the MFGPT |
| 1525 | timer(s) in the CS5535 and CS5536 companion chip for the geode. |
| 1526 | MFGPTs have a better resolution and max interval than the |
| 1527 | generic PIT, and are suitable for use as high-res timers. |
| 1528 | |
Sam Ravnborg | bc0120f | 2007-11-06 23:10:39 +0100 | [diff] [blame] | 1529 | endif # X86_32 |
| 1530 | |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1531 | config K8_NB |
| 1532 | def_bool y |
Sam Ravnborg | bc0120f | 2007-11-06 23:10:39 +0100 | [diff] [blame] | 1533 | depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA))) |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1534 | |
| 1535 | source "drivers/pcmcia/Kconfig" |
| 1536 | |
| 1537 | source "drivers/pci/hotplug/Kconfig" |
| 1538 | |
| 1539 | endmenu |
| 1540 | |
| 1541 | |
| 1542 | menu "Executable file formats / Emulations" |
| 1543 | |
| 1544 | source "fs/Kconfig.binfmt" |
| 1545 | |
| 1546 | config IA32_EMULATION |
| 1547 | bool "IA32 Emulation" |
| 1548 | depends on X86_64 |
Roland McGrath | a97f52e | 2008-01-30 13:31:55 +0100 | [diff] [blame] | 1549 | select COMPAT_BINFMT_ELF |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1550 | help |
| 1551 | Include code to run 32-bit programs under a 64-bit kernel. You should |
| 1552 | likely turn this on, unless you're 100% sure that you don't have any |
| 1553 | 32-bit programs left. |
| 1554 | |
| 1555 | config IA32_AOUT |
| 1556 | tristate "IA32 a.out support" |
| 1557 | depends on IA32_EMULATION |
| 1558 | help |
| 1559 | Support old a.out binaries in the 32bit emulation. |
| 1560 | |
| 1561 | config COMPAT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1562 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1563 | depends on IA32_EMULATION |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1564 | |
| 1565 | config COMPAT_FOR_U64_ALIGNMENT |
| 1566 | def_bool COMPAT |
| 1567 | depends on X86_64 |
| 1568 | |
| 1569 | config SYSVIPC_COMPAT |
Harvey Harrison | 3c2362e | 2008-01-30 13:31:03 +0100 | [diff] [blame] | 1570 | def_bool y |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1571 | depends on X86_64 && COMPAT && SYSVIPC |
Sam Ravnborg | e279b6c | 2007-11-06 20:41:05 +0100 | [diff] [blame] | 1572 | |
| 1573 | endmenu |
| 1574 | |
| 1575 | |
| 1576 | source "net/Kconfig" |
| 1577 | |
| 1578 | source "drivers/Kconfig" |
| 1579 | |
| 1580 | source "drivers/firmware/Kconfig" |
| 1581 | |
| 1582 | source "fs/Kconfig" |
| 1583 | |
| 1584 | source "kernel/Kconfig.instrumentation" |
| 1585 | |
| 1586 | source "arch/x86/Kconfig.debug" |
| 1587 | |
| 1588 | source "security/Kconfig" |
| 1589 | |
| 1590 | source "crypto/Kconfig" |
| 1591 | |
| 1592 | source "lib/Kconfig" |