1 # SPDX-License-Identifier: GPL-2.0 1 # SPDX-License-Identifier: GPL-2.0
2 # Select 32 or 64 bit !! 2 config ALPHA
3 config 64BIT !! 3 bool
4 bool "64-bit kernel" if "$(ARCH)" = "x !! 4 default y
5 default "$(ARCH)" != "i386" <<
6 help <<
7 Say yes to build a 64-bit kernel - f <<
8 Say no to build a 32-bit kernel - fo <<
9 <<
10 config X86_32 <<
11 def_bool y <<
12 depends on !64BIT <<
13 # Options that are inherently 32-bit k <<
14 select ARCH_WANT_IPC_PARSE_VERSION <<
15 select CLKSRC_I8253 <<
16 select CLONE_BACKWARDS <<
17 select GENERIC_VDSO_32 <<
18 select HAVE_DEBUG_STACKOVERFLOW <<
19 select KMAP_LOCAL <<
20 select MODULES_USE_ELF_REL <<
21 select OLD_SIGACTION <<
22 select ARCH_SPLIT_ARG64 <<
23 <<
24 config X86_64 <<
25 def_bool y <<
26 depends on 64BIT <<
27 # Options that are inherently 64-bit k <<
28 select ARCH_HAS_GIGANTIC_PAGE <<
29 select ARCH_SUPPORTS_INT128 if CC_HAS_ <<
30 select ARCH_SUPPORTS_PER_VMA_LOCK <<
31 select ARCH_SUPPORTS_HUGE_PFNMAP if TR <<
32 select HAVE_ARCH_SOFT_DIRTY <<
33 select MODULES_USE_ELF_RELA <<
34 select NEED_DMA_MAP_STATE <<
35 select SWIOTLB <<
36 select ARCH_HAS_ELFCORE_COMPAT <<
37 select ZONE_DMA32 <<
38 select EXECMEM if DYNAMIC_FTRACE <<
39 <<
40 config FORCE_DYNAMIC_FTRACE <<
41 def_bool y <<
42 depends on X86_32 <<
43 depends on FUNCTION_TRACER <<
44 select DYNAMIC_FTRACE <<
45 help <<
46 We keep the static function tracing <<
47 in order to test the non static func <<
48 generic code, as other architectures <<
49 only need to keep it around for x86_ <<
50 for x86_32. For x86_32, force DYNAMI <<
51 # <<
52 # Arch settings <<
53 # <<
54 # ( Note that options that are marked 'if X86_ <<
55 # ported to 32-bit as well. ) <<
56 # <<
57 config X86 <<
58 def_bool y <<
59 # <<
60 # Note: keep this list sorted alphabet <<
61 # <<
62 select ACPI_LEGACY_TABLES_LOOKUP <<
63 select ACPI_SYSTEM_POWER_STATES_SUPPOR <<
64 select ACPI_HOTPLUG_CPU <<
65 select ARCH_32BIT_OFF_T <<
66 select ARCH_CLOCKSOURCE_INIT <<
67 select ARCH_CONFIGURES_CPU_MITIGATIONS <<
68 select ARCH_CORRECT_STACKTRACE_ON_KRET <<
69 select ARCH_ENABLE_HUGEPAGE_MIGRATION <<
70 select ARCH_ENABLE_MEMORY_HOTPLUG if X <<
71 select ARCH_ENABLE_MEMORY_HOTREMOVE if <<
72 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if <<
73 select ARCH_ENABLE_THP_MIGRATION if X8 <<
74 select ARCH_HAS_ACPI_TABLE_UPGRADE <<
75 select ARCH_HAS_CACHE_LINE_SIZE <<
76 select ARCH_HAS_CPU_CACHE_INVALIDATE_M <<
77 select ARCH_HAS_CPU_FINALIZE_INIT <<
78 select ARCH_HAS_CPU_PASID <<
79 select ARCH_HAS_CURRENT_STACK_POINTER <<
80 select ARCH_HAS_DEBUG_VIRTUAL <<
81 select ARCH_HAS_DEBUG_VM_PGTABLE <<
82 select ARCH_HAS_DEVMEM_IS_ALLOWED <<
83 select ARCH_HAS_DMA_OPS <<
84 select ARCH_HAS_EARLY_DEBUG <<
85 select ARCH_HAS_ELF_RANDOMIZE <<
86 select ARCH_HAS_FAST_MULTIPLIER <<
87 select ARCH_HAS_FORTIFY_SOURCE <<
88 select ARCH_HAS_GCOV_PROFILE_ALL <<
89 select ARCH_HAS_KCOV <<
90 select ARCH_HAS_KERNEL_FPU_SUPPORT <<
91 select ARCH_HAS_MEM_ENCRYPT <<
92 select ARCH_HAS_MEMBARRIER_SYNC_CORE <<
93 select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS <<
94 select ARCH_HAS_NON_OVERLAPPING_ADDRES <<
95 select ARCH_HAS_PMEM_API <<
96 select ARCH_HAS_PTE_DEVMAP <<
97 select ARCH_HAS_PTE_SPECIAL <<
98 select ARCH_HAS_HW_PTE_YOUNG <<
99 select ARCH_HAS_NONLEAF_PMD_YOUNG <<
100 select ARCH_HAS_UACCESS_FLUSHCACHE <<
101 select ARCH_HAS_COPY_MC <<
102 select ARCH_HAS_SET_MEMORY <<
103 select ARCH_HAS_SET_DIRECT_MAP <<
104 select ARCH_HAS_STRICT_KERNEL_RWX <<
105 select ARCH_HAS_STRICT_MODULE_RWX <<
106 select ARCH_HAS_SYNC_CORE_BEFORE_USERM <<
107 select ARCH_HAS_SYSCALL_WRAPPER <<
108 select ARCH_HAS_UBSAN <<
109 select ARCH_HAS_DEBUG_WX <<
110 select ARCH_HAS_ZONE_DMA_SET if EXPERT <<
111 select ARCH_HAVE_NMI_SAFE_CMPXCHG <<
112 select ARCH_HAVE_EXTRA_ELF_NOTES <<
113 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABL <<
114 select ARCH_MIGHT_HAVE_ACPI_PDC <<
115 select ARCH_MIGHT_HAVE_PC_PARPORT 5 select ARCH_MIGHT_HAVE_PC_PARPORT
116 select ARCH_MIGHT_HAVE_PC_SERIO 6 select ARCH_MIGHT_HAVE_PC_SERIO
117 select ARCH_STACKWALK !! 7 select ARCH_NO_PREEMPT
118 select ARCH_SUPPORTS_ACPI !! 8 select ARCH_NO_SG_CHAIN
119 select ARCH_SUPPORTS_ATOMIC_RMW !! 9 select ARCH_USE_CMPXCHG_LOCKREF
120 select ARCH_SUPPORTS_DEBUG_PAGEALLOC !! 10 select FORCE_PCI if !ALPHA_JENSEN
121 select ARCH_SUPPORTS_PAGE_TABLE_CHECK !! 11 select PCI_DOMAINS if PCI
122 select ARCH_SUPPORTS_NUMA_BALANCING !! 12 select PCI_SYSCALL if PCI
123 select ARCH_SUPPORTS_KMAP_LOCAL_FORCE_ !! 13 select HAVE_AOUT
124 select ARCH_SUPPORTS_CFI_CLANG !! 14 select HAVE_ASM_MODVERSIONS
125 select ARCH_USES_CFI_TRAPS !! 15 select HAVE_IDE
126 select ARCH_SUPPORTS_LTO_CLANG !! 16 select HAVE_OPROFILE
127 select ARCH_SUPPORTS_LTO_CLANG_THIN !! 17 select HAVE_PCSPKR_PLATFORM
128 select ARCH_SUPPORTS_RT !! 18 select HAVE_PERF_EVENTS
129 select ARCH_USE_BUILTIN_BSWAP !! 19 select NEED_DMA_MAP_STATE
130 select ARCH_USE_CMPXCHG_LOCKREF !! 20 select NEED_SG_DMA_LENGTH
131 select ARCH_USE_MEMTEST !! 21 select VIRT_TO_BUS
132 select ARCH_USE_QUEUED_RWLOCKS <<
133 select ARCH_USE_QUEUED_SPINLOCKS <<
134 select ARCH_USE_SYM_ANNOTATIONS <<
135 select ARCH_WANT_BATCHED_UNMAP_TLB_FLU <<
136 select ARCH_WANT_DEFAULT_BPF_JIT <<
137 select ARCH_WANTS_DYNAMIC_TASK_STRUCT <<
138 select ARCH_WANTS_NO_INSTR <<
139 select ARCH_WANT_GENERAL_HUGETLB <<
140 select ARCH_WANT_HUGE_PMD_SHARE <<
141 select ARCH_WANT_LD_ORPHAN_WARN <<
142 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP <<
143 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEM <<
144 select ARCH_WANTS_THP_SWAP <<
145 select ARCH_HAS_PARANOID_L1D_FLUSH <<
146 select BUILDTIME_TABLE_SORT <<
147 select CLKEVT_I8253 <<
148 select CLOCKSOURCE_VALIDATE_LAST_CYCLE <<
149 select CLOCKSOURCE_WATCHDOG <<
150 # Word-size accesses may read uninitia <<
151 # in strings and cause false KMSAN rep <<
152 select DCACHE_WORD_ACCESS <<
153 select DYNAMIC_SIGFRAME <<
154 select EDAC_ATOMIC_SCRUB <<
155 select EDAC_SUPPORT <<
156 select GENERIC_CLOCKEVENTS_BROADCAST <<
157 select GENERIC_CLOCKEVENTS_BROADCAST_I <<
158 select GENERIC_CLOCKEVENTS_MIN_ADJUST <<
159 select GENERIC_CMOS_UPDATE <<
160 select GENERIC_CPU_AUTOPROBE <<
161 select GENERIC_CPU_DEVICES <<
162 select GENERIC_CPU_VULNERABILITIES <<
163 select GENERIC_EARLY_IOREMAP <<
164 select GENERIC_ENTRY <<
165 select GENERIC_IOMAP <<
166 select GENERIC_IRQ_EFFECTIVE_AFF_MASK <<
167 select GENERIC_IRQ_MATRIX_ALLOCATOR <<
168 select GENERIC_IRQ_MIGRATION <<
169 select GENERIC_IRQ_PROBE 22 select GENERIC_IRQ_PROBE
170 select GENERIC_IRQ_RESERVATION_MODE !! 23 select GENERIC_PCI_IOMAP if PCI
>> 24 select AUTO_IRQ_AFFINITY if SMP
171 select GENERIC_IRQ_SHOW 25 select GENERIC_IRQ_SHOW
172 select GENERIC_PENDING_IRQ !! 26 select ARCH_WANT_IPC_PARSE_VERSION
173 select GENERIC_PTDUMP !! 27 select ARCH_HAVE_NMI_SAFE_CMPXCHG
>> 28 select AUDIT_ARCH
>> 29 select GENERIC_CLOCKEVENTS
>> 30 select GENERIC_CPU_VULNERABILITIES
174 select GENERIC_SMP_IDLE_THREAD 31 select GENERIC_SMP_IDLE_THREAD
175 select GENERIC_TIME_VSYSCALL !! 32 select GENERIC_STRNCPY_FROM_USER
176 select GENERIC_GETTIMEOFDAY !! 33 select GENERIC_STRNLEN_USER
177 select GENERIC_VDSO_TIME_NS <<
178 select GENERIC_VDSO_OVERFLOW_PROTECT <<
179 select GUP_GET_PXX_LOW_HIGH <<
180 select HARDIRQS_SW_RESEND <<
181 select HARDLOCKUP_CHECK_TIMESTAMP <<
182 select HAS_IOPORT <<
183 select HAVE_ACPI_APEI <<
184 select HAVE_ACPI_APEI_NMI <<
185 select HAVE_ALIGNED_STRUCT_PAGE <<
186 select HAVE_ARCH_AUDITSYSCALL 34 select HAVE_ARCH_AUDITSYSCALL
187 select HAVE_ARCH_HUGE_VMAP <<
188 select HAVE_ARCH_HUGE_VMALLOC <<
189 select HAVE_ARCH_JUMP_LABEL <<
190 select HAVE_ARCH_JUMP_LABEL_RELATIVE <<
191 select HAVE_ARCH_KASAN <<
192 select HAVE_ARCH_KASAN_VMALLOC <<
193 select HAVE_ARCH_KFENCE <<
194 select HAVE_ARCH_KMSAN <<
195 select HAVE_ARCH_KGDB <<
196 select HAVE_ARCH_MMAP_RND_BITS <<
197 select HAVE_ARCH_MMAP_RND_COMPAT_BITS <<
198 select HAVE_ARCH_COMPAT_MMAP_BASES <<
199 select HAVE_ARCH_PREL32_RELOCATIONS <<
200 select HAVE_ARCH_SECCOMP_FILTER <<
201 select HAVE_ARCH_THREAD_STRUCT_WHITELI <<
202 select HAVE_ARCH_STACKLEAK <<
203 select HAVE_ARCH_TRACEHOOK <<
204 select HAVE_ARCH_TRANSPARENT_HUGEPAGE <<
205 select HAVE_ARCH_TRANSPARENT_HUGEPAGE_ <<
206 select HAVE_ARCH_USERFAULTFD_WP <<
207 select HAVE_ARCH_USERFAULTFD_MINOR <<
208 select HAVE_ARCH_VMAP_STACK <<
209 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFS <<
210 select HAVE_ARCH_WITHIN_STACK_FRAMES <<
211 select HAVE_ASM_MODVERSIONS <<
212 select HAVE_CMPXCHG_DOUBLE <<
213 select HAVE_CMPXCHG_LOCAL <<
214 select HAVE_CONTEXT_TRACKING_USER <<
215 select HAVE_CONTEXT_TRACKING_USER_OFFS <<
216 select HAVE_C_RECORDMCOUNT <<
217 select HAVE_OBJTOOL_MCOUNT <<
218 select HAVE_OBJTOOL_NOP_MCOUNT <<
219 select HAVE_BUILDTIME_MCOUNT_SORT <<
220 select HAVE_DEBUG_KMEMLEAK <<
221 select HAVE_DMA_CONTIGUOUS <<
222 select HAVE_DYNAMIC_FTRACE <<
223 select HAVE_DYNAMIC_FTRACE_WITH_REGS <<
224 select HAVE_DYNAMIC_FTRACE_WITH_ARGS <<
225 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT <<
226 select HAVE_SAMPLE_FTRACE_DIRECT <<
227 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI <<
228 select HAVE_EBPF_JIT <<
229 select HAVE_EFFICIENT_UNALIGNED_ACCESS <<
230 select HAVE_EISA <<
231 select HAVE_EXIT_THREAD <<
232 select HAVE_GUP_FAST <<
233 select HAVE_FENTRY <<
234 select HAVE_FTRACE_MCOUNT_RECORD <<
235 select HAVE_FUNCTION_GRAPH_RETVAL <<
236 select HAVE_FUNCTION_GRAPH_TRACER <<
237 select HAVE_FUNCTION_TRACER <<
238 select HAVE_GCC_PLUGINS <<
239 select HAVE_HW_BREAKPOINT <<
240 select HAVE_IOREMAP_PROT <<
241 select HAVE_IRQ_EXIT_ON_IRQ_STACK <<
242 select HAVE_IRQ_TIME_ACCOUNTING <<
243 select HAVE_JUMP_LABEL_HACK <<
244 select HAVE_KERNEL_BZIP2 <<
245 select HAVE_KERNEL_GZIP <<
246 select HAVE_KERNEL_LZ4 <<
247 select HAVE_KERNEL_LZMA <<
248 select HAVE_KERNEL_LZO <<
249 select HAVE_KERNEL_XZ <<
250 select HAVE_KERNEL_ZSTD <<
251 select HAVE_KPROBES <<
252 select HAVE_KPROBES_ON_FTRACE <<
253 select HAVE_FUNCTION_ERROR_INJECTION <<
254 select HAVE_KRETPROBES <<
255 select HAVE_RETHOOK <<
256 select HAVE_LIVEPATCH <<
257 select HAVE_MIXED_BREAKPOINTS_REGS <<
258 select HAVE_MOD_ARCH_SPECIFIC 35 select HAVE_MOD_ARCH_SPECIFIC
259 select HAVE_MOVE_PMD !! 36 select MODULES_USE_ELF_RELA
260 select HAVE_MOVE_PUD !! 37 select ODD_RT_SIGACTION
261 select HAVE_NOINSTR_HACK !! 38 select OLD_SIGSUSPEND
262 select HAVE_NMI !! 39 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
263 select HAVE_NOINSTR_VALIDATION !! 40 select MMU_GATHER_NO_RANGE
264 select HAVE_OBJTOOL !! 41 help
265 select HAVE_OPTPROBES !! 42 The Alpha is a 64-bit general-purpose processor designed and
266 select HAVE_PAGE_SIZE_4KB !! 43 marketed by the Digital Equipment Corporation of blessed memory,
267 select HAVE_PCSPKR_PLATFORM !! 44 now Hewlett-Packard. The Alpha Linux project has a home page at
268 select HAVE_PERF_EVENTS !! 45 <http://www.alphalinux.org/>.
269 select HAVE_PERF_EVENTS_NMI <<
270 select HAVE_HARDLOCKUP_DETECTOR_PERF <<
271 select HAVE_PCI <<
272 select HAVE_PERF_REGS <<
273 select HAVE_PERF_USER_STACK_DUMP <<
274 select MMU_GATHER_RCU_TABLE_FREE <<
275 select MMU_GATHER_MERGE_VMAS <<
276 select HAVE_POSIX_CPU_TIMERS_TASK_WORK <<
277 select HAVE_REGS_AND_STACK_ACCESS_API <<
278 select HAVE_RELIABLE_STACKTRACE <<
279 select HAVE_FUNCTION_ARG_ACCESS_API <<
280 select HAVE_SETUP_PER_CPU_AREA <<
281 select HAVE_SOFTIRQ_ON_OWN_STACK <<
282 select HAVE_STACKPROTECTOR <<
283 select HAVE_STACK_VALIDATION <<
284 select HAVE_STATIC_CALL <<
285 select HAVE_STATIC_CALL_INLINE <<
286 select HAVE_PREEMPT_DYNAMIC_CALL <<
287 select HAVE_RSEQ <<
288 select HAVE_RUST <<
289 select HAVE_SYSCALL_TRACEPOINTS <<
290 select HAVE_UACCESS_VALIDATION <<
291 select HAVE_UNSTABLE_SCHED_CLOCK <<
292 select HAVE_USER_RETURN_NOTIFIER <<
293 select HAVE_GENERIC_VDSO <<
294 select VDSO_GETRANDOM <<
295 select HOTPLUG_PARALLEL <<
296 select HOTPLUG_SMT <<
297 select HOTPLUG_SPLIT_STARTUP <<
298 select IRQ_FORCED_THREADING <<
299 select LOCK_MM_AND_FIND_VMA <<
300 select NEED_PER_CPU_EMBED_FIRST_CHUNK <<
301 select NEED_PER_CPU_PAGE_FIRST_CHUNK <<
302 select NEED_SG_DMA_LENGTH <<
303 select NUMA_MEMBLKS <<
304 select PCI_DOMAINS <<
305 select PCI_LOCKLESS_CONFIG <<
306 select PERF_EVENTS <<
307 select RTC_LIB <<
308 select RTC_MC146818_LIB <<
309 select SPARSE_IRQ <<
310 select SYSCTL_EXCEPTION_TRACE <<
311 select THREAD_INFO_IN_TASK <<
312 select TRACE_IRQFLAGS_SUPPORT <<
313 select TRACE_IRQFLAGS_NMI_SUPPORT <<
314 select USER_STACKTRACE_SUPPORT <<
315 select HAVE_ARCH_KCSAN <<
316 select PROC_PID_ARCH_STATUS <<
317 select HAVE_ARCH_NODE_DEV_GROUP <<
318 select FUNCTION_ALIGNMENT_16B <<
319 select FUNCTION_ALIGNMENT_4B <<
320 imply IMA_SECURE_AND_OR_TRUSTED_BOOT <<
321 select HAVE_DYNAMIC_FTRACE_NO_PATCHABL <<
322 <<
323 config INSTRUCTION_DECODER <<
324 def_bool y <<
325 depends on KPROBES || PERF_EVENTS || U <<
326 <<
327 config OUTPUT_FORMAT <<
328 string <<
329 default "elf32-i386" if X86_32 <<
330 default "elf64-x86-64" if X86_64 <<
331 <<
332 config LOCKDEP_SUPPORT <<
333 def_bool y <<
334 46
335 config STACKTRACE_SUPPORT !! 47 config 64BIT
336 def_bool y 48 def_bool y
337 49
338 config MMU 50 config MMU
339 def_bool y <<
340 <<
341 config ARCH_MMAP_RND_BITS_MIN <<
342 default 28 if 64BIT <<
343 default 8 <<
344 <<
345 config ARCH_MMAP_RND_BITS_MAX <<
346 default 32 if 64BIT <<
347 default 16 <<
348 <<
349 config ARCH_MMAP_RND_COMPAT_BITS_MIN <<
350 default 8 <<
351 <<
352 config ARCH_MMAP_RND_COMPAT_BITS_MAX <<
353 default 16 <<
354 <<
355 config SBUS <<
356 bool 51 bool
>> 52 default y
357 53
358 config GENERIC_ISA_DMA !! 54 config ARCH_HAS_ILOG2_U32
359 def_bool y <<
360 depends on ISA_DMA_API <<
361 <<
362 config GENERIC_CSUM <<
363 bool 55 bool
364 default y if KMSAN || KASAN !! 56 default n
365 <<
366 config GENERIC_BUG <<
367 def_bool y <<
368 depends on BUG <<
369 select GENERIC_BUG_RELATIVE_POINTERS i <<
370 57
371 config GENERIC_BUG_RELATIVE_POINTERS !! 58 config ARCH_HAS_ILOG2_U64
372 bool 59 bool
373 !! 60 default n
374 config ARCH_MAY_HAVE_PC_FDC <<
375 def_bool y <<
376 depends on ISA_DMA_API <<
377 61
378 config GENERIC_CALIBRATE_DELAY 62 config GENERIC_CALIBRATE_DELAY
379 def_bool y <<
380 <<
381 config ARCH_HAS_CPU_RELAX <<
382 def_bool y <<
383 <<
384 config ARCH_HIBERNATION_POSSIBLE <<
385 def_bool y <<
386 <<
387 config ARCH_SUSPEND_POSSIBLE <<
388 def_bool y <<
389 <<
390 config AUDIT_ARCH <<
391 def_bool y if X86_64 <<
392 <<
393 config KASAN_SHADOW_OFFSET <<
394 hex <<
395 depends on KASAN <<
396 default 0xdffffc0000000000 <<
397 <<
398 config HAVE_INTEL_TXT <<
399 def_bool y <<
400 depends on INTEL_IOMMU && ACPI <<
401 <<
402 config X86_64_SMP <<
403 def_bool y <<
404 depends on X86_64 && SMP <<
405 <<
406 config ARCH_SUPPORTS_UPROBES <<
407 def_bool y <<
408 <<
409 config FIX_EARLYCON_MEM <<
410 def_bool y <<
411 <<
412 config DYNAMIC_PHYSICAL_MASK <<
413 bool <<
414 <<
415 config PGTABLE_LEVELS <<
416 int <<
417 default 5 if X86_5LEVEL <<
418 default 4 if X86_64 <<
419 default 3 if X86_PAE <<
420 default 2 <<
421 <<
422 config CC_HAS_SANE_STACKPROTECTOR <<
423 bool 63 bool
424 default $(success,$(srctree)/scripts/g <<
425 default $(success,$(srctree)/scripts/g <<
426 help <<
427 We have to make sure stack protector <<
428 the compiler produces broken code or <<
429 the segment on 32-bit kernels. <<
430 <<
431 menu "Processor type and features" <<
432 <<
433 config SMP <<
434 bool "Symmetric multi-processing suppo <<
435 help <<
436 This enables support for systems wit <<
437 a system with only one CPU, say N. I <<
438 than one CPU, say Y. <<
439 <<
440 If you say N here, the kernel will r <<
441 machines, but will use only one CPU <<
442 you say Y here, the kernel will run <<
443 uniprocessor machines. On a uniproce <<
444 will run faster if you say N here. <<
445 <<
446 Note that if you say Y here and choo <<
447 "Pentium" under "Processor family", <<
448 architectures. Similarly, multiproce <<
449 architecture may not work on all Pen <<
450 <<
451 People using multiprocessor machines <<
452 Y to "Enhanced Real Time Clock Suppo <<
453 Management" code will be disabled if <<
454 <<
455 See also <file:Documentation/arch/x8 <<
456 <file:Documentation/admin-guide/lock <<
457 <http://www.tldp.org/docs.html#howto <<
458 <<
459 If you don't know what to do here, s <<
460 <<
461 config X86_X2APIC <<
462 bool "Support x2apic" <<
463 depends on X86_LOCAL_APIC && X86_64 && <<
464 help <<
465 This enables x2apic support on CPUs <<
466 <<
467 This allows 32-bit apic IDs (so it c <<
468 and accesses the local apic via MSRs <<
469 <<
470 Some Intel systems circa 2022 and la <<
471 and can not fall back to the legacy <<
472 enabled in the BIOS. They will boot <<
473 without enabling this option. <<
474 <<
475 If you don't know what to do here, s <<
476 <<
477 config X86_POSTED_MSI <<
478 bool "Enable MSI and MSI-x delivery by <<
479 depends on X86_64 && IRQ_REMAP <<
480 help <<
481 This enables MSIs that are under int <<
482 posted interrupts to the host kernel <<
483 potentially be improved by coalescin <<
484 frequency bursts. <<
485 <<
486 If you don't know what to do here, s <<
487 <<
488 config X86_MPPARSE <<
489 bool "Enable MPS table" if ACPI <<
490 default y 64 default y
491 depends on X86_LOCAL_APIC <<
492 help <<
493 For old smp systems that do not have <<
494 (esp with 64bit cpus) with acpi supp <<
495 <<
496 config X86_CPU_RESCTRL <<
497 bool "x86 CPU resource control support <<
498 depends on X86 && (CPU_SUP_INTEL || CP <<
499 select KERNFS <<
500 select PROC_CPU_RESCTRL if PRO <<
501 help <<
502 Enable x86 CPU resource control supp <<
503 <<
504 Provide support for the allocation a <<
505 usage by the CPU. <<
506 <<
507 Intel calls this Intel Resource Dire <<
508 (Intel(R) RDT). More information abo <<
509 Intel x86 Architecture Software Deve <<
510 <<
511 AMD calls this AMD Platform Quality <<
512 More information about AMD QoS can b <<
513 Platform Quality of Service Extensio <<
514 65
515 Say N if unsure. !! 66 config ZONE_DMA
516 <<
517 config X86_FRED <<
518 bool "Flexible Return and Event Delive <<
519 depends on X86_64 <<
520 help <<
521 When enabled, try to use Flexible Re <<
522 instead of the legacy SYSCALL/SYSENT <<
523 ring transitions and exception/inter <<
524 system supports it. <<
525 <<
526 config X86_BIGSMP <<
527 bool "Support for big SMP systems with <<
528 depends on SMP && X86_32 <<
529 help <<
530 This option is needed for the system <<
531 <<
532 config X86_EXTENDED_PLATFORM <<
533 bool "Support for extended (non-PC) x8 <<
534 default y <<
535 help <<
536 If you disable this option then the <<
537 standard PC platforms. (which covers <<
538 systems out there.) <<
539 <<
540 If you enable this option then you'l <<
541 for the following non-PC x86 platfor <<
542 CONFIG_64BIT. <<
543 <<
544 32-bit platforms (CONFIG_64BIT=n): <<
545 Goldfish (Android emulator) <<
546 AMD Elan <<
547 RDC R-321x SoC <<
548 SGI 320/540 (Visual Workstatio <<
549 STA2X11-based (e.g. Northville <<
550 Moorestown MID devices <<
551 <<
552 64-bit platforms (CONFIG_64BIT=y): <<
553 Numascale NumaChip <<
554 ScaleMP vSMP <<
555 SGI Ultraviolet <<
556 <<
557 If you have one of these systems, or <<
558 generic distribution kernel, say Y h <<
559 <<
560 # This is an alphabetically sorted list of 64 <<
561 # Please maintain the alphabetic order if and <<
562 config X86_NUMACHIP <<
563 bool "Numascale NumaChip" <<
564 depends on X86_64 <<
565 depends on X86_EXTENDED_PLATFORM <<
566 depends on NUMA <<
567 depends on SMP <<
568 depends on X86_X2APIC <<
569 depends on PCI_MMCONFIG <<
570 help <<
571 Adds support for Numascale NumaChip <<
572 enable more than ~168 cores. <<
573 If you don't have one of these, you <<
574 <<
575 config X86_VSMP <<
576 bool "ScaleMP vSMP" <<
577 select HYPERVISOR_GUEST <<
578 select PARAVIRT <<
579 depends on X86_64 && PCI <<
580 depends on X86_EXTENDED_PLATFORM <<
581 depends on SMP <<
582 help <<
583 Support for ScaleMP vSMP systems. S <<
584 supposed to run on these EM64T-based <<
585 if you have one of these machines. <<
586 <<
587 config X86_UV <<
588 bool "SGI Ultraviolet" <<
589 depends on X86_64 <<
590 depends on X86_EXTENDED_PLATFORM <<
591 depends on NUMA <<
592 depends on EFI <<
593 depends on KEXEC_CORE <<
594 depends on X86_X2APIC <<
595 depends on PCI <<
596 help <<
597 This option is needed in order to su <<
598 If you don't have one of these, you <<
599 <<
600 # Following is an alphabetically sorted list o <<
601 # Please maintain the alphabetic order if and <<
602 <<
603 config X86_GOLDFISH <<
604 bool "Goldfish (Virtual Platform)" <<
605 depends on X86_EXTENDED_PLATFORM <<
606 help <<
607 Enable support for the Goldfish virt <<
608 for Android development. Unless you <<
609 Goldfish emulator say N here. <<
610 <<
611 config X86_INTEL_CE <<
612 bool "CE4100 TV platform" <<
613 depends on PCI <<
614 depends on PCI_GODIRECT <<
615 depends on X86_IO_APIC <<
616 depends on X86_32 <<
617 depends on X86_EXTENDED_PLATFORM <<
618 select X86_REBOOTFIXUPS <<
619 select OF <<
620 select OF_EARLY_FLATTREE <<
621 help <<
622 Select for the Intel CE media proces <<
623 This option compiles in support for <<
624 boxes and media devices. <<
625 <<
626 config X86_INTEL_MID <<
627 bool "Intel MID platform support" <<
628 depends on X86_EXTENDED_PLATFORM <<
629 depends on X86_PLATFORM_DEVICES <<
630 depends on PCI <<
631 depends on X86_64 || (PCI_GOANY && X86 <<
632 depends on X86_IO_APIC <<
633 select I2C <<
634 select DW_APB_TIMER <<
635 select INTEL_SCU_PCI <<
636 help <<
637 Select to build a kernel capable of <<
638 Internet Device) platform systems wh <<
639 interfaces. If you are building for <<
640 <<
641 Intel MID platforms are based on an <<
642 consume less power than most of the <<
643 <<
644 config X86_INTEL_QUARK <<
645 bool "Intel Quark platform support" <<
646 depends on X86_32 <<
647 depends on X86_EXTENDED_PLATFORM <<
648 depends on X86_PLATFORM_DEVICES <<
649 depends on X86_TSC <<
650 depends on PCI <<
651 depends on PCI_GOANY <<
652 depends on X86_IO_APIC <<
653 select IOSF_MBI <<
654 select INTEL_IMR <<
655 select COMMON_CLK <<
656 help <<
657 Select to include support for Quark <<
658 Say Y here if you have a Quark based <<
659 compatible Intel Galileo. <<
660 <<
661 config X86_INTEL_LPSS <<
662 bool "Intel Low Power Subsystem Suppor <<
663 depends on X86 && ACPI && PCI <<
664 select COMMON_CLK <<
665 select PINCTRL <<
666 select IOSF_MBI <<
667 help <<
668 Select to build support for Intel Lo <<
669 found on Intel Lynxpoint PCH. Select <<
670 things like clock tree (common clock <<
671 which are needed by the LPSS periphe <<
672 <<
673 config X86_AMD_PLATFORM_DEVICE <<
674 bool "AMD ACPI2Platform devices suppor <<
675 depends on ACPI <<
676 select COMMON_CLK <<
677 select PINCTRL <<
678 help <<
679 Select to interpret AMD specific ACP <<
680 such as I2C, UART, GPIO found on AMD <<
681 I2C and UART depend on COMMON_CLK to <<
682 implemented under PINCTRL subsystem. <<
683 <<
684 config IOSF_MBI <<
685 tristate "Intel SoC IOSF Sideband supp <<
686 depends on PCI <<
687 help <<
688 This option enables sideband registe <<
689 platforms. On these platforms the IO <<
690 MSR's for some register accesses, mo <<
691 and power. Drivers may query the ava <<
692 determine if they need the sideband <<
693 platforms. The sideband is available <<
694 This list is not meant to be exclusi <<
695 - BayTrail <<
696 - Braswell <<
697 - Quark <<
698 <<
699 You should say Y if you are running <<
700 <<
701 config IOSF_MBI_DEBUG <<
702 bool "Enable IOSF sideband access thro <<
703 depends on IOSF_MBI && DEBUG_FS <<
704 help <<
705 Select this option to expose the IOS <<
706 MDR, MCRX) through debugfs to write <<
707 different units on the SoC. This is <<
708 state information for debug and anal <<
709 mechanism, users of this option woul <<
710 device they want to access. <<
711 <<
712 If you don't require the option or a <<
713 <<
714 config X86_RDC321X <<
715 bool "RDC R-321x SoC" <<
716 depends on X86_32 <<
717 depends on X86_EXTENDED_PLATFORM <<
718 select M486 <<
719 select X86_REBOOTFIXUPS <<
720 help <<
721 This option is needed for RDC R-321x <<
722 as R-8610-(G). <<
723 If you don't have one of these chips <<
724 <<
725 config X86_32_NON_STANDARD <<
726 bool "Support non-standard 32-bit SMP <<
727 depends on X86_32 && SMP <<
728 depends on X86_EXTENDED_PLATFORM <<
729 help <<
730 This option compiles in the bigsmp a <<
731 subarchitectures. It is intended fo <<
732 kernel. If you select them all, kern <<
733 one and will fallback to default. <<
734 <<
735 # Alphabetically sorted list of Non standard 3 <<
736 <<
737 config X86_SUPPORTS_MEMORY_FAILURE <<
738 def_bool y <<
739 # MCE code calls memory_failure(): <<
740 depends on X86_MCE <<
741 # On 32-bit this adds too big of NODES <<
742 # On 32-bit SPARSEMEM adds too big of <<
743 depends on X86_64 || !SPARSEMEM <<
744 select ARCH_SUPPORTS_MEMORY_FAILURE <<
745 <<
746 config STA2X11 <<
747 bool "STA2X11 Companion Chip Support" <<
748 depends on X86_32_NON_STANDARD && PCI <<
749 select SWIOTLB <<
750 select MFD_STA2X11 <<
751 select GPIOLIB <<
752 help <<
753 This adds support for boards based o <<
754 a.k.a. "ConneXt". The chip is used i <<
755 PC chipset, so all "standard" periph <<
756 option is selected the kernel will s <<
757 standard PC machines. <<
758 <<
759 config X86_32_IRIS <<
760 tristate "Eurobraille/Iris poweroff mo <<
761 depends on X86_32 <<
762 help <<
763 The Iris machines from EuroBraille d <<
764 to shut themselves down properly. A <<
765 needed to do so, which is what this <<
766 kernel shutdown. <<
767 <<
768 This is only for Iris machines from <<
769 <<
770 If unused, say N. <<
771 <<
772 config SCHED_OMIT_FRAME_POINTER <<
773 def_bool y <<
774 prompt "Single-depth WCHAN output" <<
775 depends on X86 <<
776 help <<
777 Calculate simpler /proc/<PID>/wchan <<
778 is disabled then wchan values will r <<
779 caller function. This provides more <<
780 at the expense of slightly more sche <<
781 <<
782 If in doubt, say "Y". <<
783 <<
784 menuconfig HYPERVISOR_GUEST <<
785 bool "Linux guest support" <<
786 help <<
787 Say Y here to enable options for run <<
788 visors. This option enables basic hy <<
789 setup. <<
790 <<
791 If you say N, all options in this su <<
792 disabled, and Linux guest support wo <<
793 <<
794 if HYPERVISOR_GUEST <<
795 <<
796 config PARAVIRT <<
797 bool "Enable paravirtualization code" <<
798 depends on HAVE_STATIC_CALL <<
799 help <<
800 This changes the kernel so it can mo <<
801 under a hypervisor, potentially impr <<
802 over full virtualization. However, <<
803 the kernel is theoretically slower a <<
804 <<
805 config PARAVIRT_XXL <<
806 bool 67 bool
807 <<
808 config PARAVIRT_DEBUG <<
809 bool "paravirt-ops debugging" <<
810 depends on PARAVIRT && DEBUG_KERNEL <<
811 help <<
812 Enable to debug paravirt_ops interna <<
813 a paravirt_op is missing when it is <<
814 <<
815 config PARAVIRT_SPINLOCKS <<
816 bool "Paravirtualization layer for spi <<
817 depends on PARAVIRT && SMP <<
818 help <<
819 Paravirtualized spinlocks allow a pv <<
820 spinlock implementation with somethi <<
821 (for example, block the virtual CPU <<
822 <<
823 It has a minimal impact on native ke <<
824 benefit on paravirtualized KVM / Xen <<
825 <<
826 If you are unsure how to answer this <<
827 <<
828 config X86_HV_CALLBACK_VECTOR <<
829 def_bool n <<
830 <<
831 source "arch/x86/xen/Kconfig" <<
832 <<
833 config KVM_GUEST <<
834 bool "KVM Guest support (including kvm <<
835 depends on PARAVIRT <<
836 select PARAVIRT_CLOCK <<
837 select ARCH_CPUIDLE_HALTPOLL <<
838 select X86_HV_CALLBACK_VECTOR <<
839 default y 68 default y
840 help <<
841 This option enables various optimiza <<
842 hypervisor. It includes a paravirtua <<
843 of relying on a PIT (or probably oth <<
844 underlying device model, the host pr <<
845 timing infrastructure such as time o <<
846 <<
847 config ARCH_CPUIDLE_HALTPOLL <<
848 def_bool n <<
849 prompt "Disable host haltpoll when loa <<
850 help <<
851 If virtualized under KVM, disable ho <<
852 <<
853 config PVH <<
854 bool "Support for running PVH guests" <<
855 help <<
856 This option enables the PVH entry po <<
857 as specified in the x86/HVM direct b <<
858 69
859 config PARAVIRT_TIME_ACCOUNTING !! 70 config GENERIC_ISA_DMA
860 bool "Paravirtual steal time accountin <<
861 depends on PARAVIRT <<
862 help <<
863 Select this option to enable fine gr <<
864 accounting. Time spent executing oth <<
865 the current vCPU is discounted from <<
866 that, there can be a small performan <<
867 <<
868 If in doubt, say N here. <<
869 <<
870 config PARAVIRT_CLOCK <<
871 bool 71 bool
872 <<
873 config JAILHOUSE_GUEST <<
874 bool "Jailhouse non-root cell support" <<
875 depends on X86_64 && PCI <<
876 select X86_PM_TIMER <<
877 help <<
878 This option allows to run Linux as g <<
879 cell. You can leave this option disa <<
880 Jailhouse and run Linux afterwards i <<
881 <<
882 config ACRN_GUEST <<
883 bool "ACRN Guest support" <<
884 depends on X86_64 <<
885 select X86_HV_CALLBACK_VECTOR <<
886 help <<
887 This option allows to run Linux as g <<
888 a flexible, lightweight reference op <<
889 real-time and safety-criticality in <<
890 IOT with small footprint and real-ti <<
891 found in https://projectacrn.org/. <<
892 <<
893 config INTEL_TDX_GUEST <<
894 bool "Intel TDX (Trust Domain Extensio <<
895 depends on X86_64 && CPU_SUP_INTEL <<
896 depends on X86_X2APIC <<
897 depends on EFI_STUB <<
898 select ARCH_HAS_CC_PLATFORM <<
899 select X86_MEM_ENCRYPT <<
900 select X86_MCE <<
901 select UNACCEPTED_MEMORY <<
902 help <<
903 Support running as a guest under Int <<
904 the guest kernel can not boot or run <<
905 TDX includes memory encryption and i <<
906 which protect the confidentiality an <<
907 memory contents and CPU state. TDX g <<
908 some attacks from the VMM. <<
909 <<
910 endif # HYPERVISOR_GUEST <<
911 <<
912 source "arch/x86/Kconfig.cpu" <<
913 <<
914 config HPET_TIMER <<
915 def_bool X86_64 <<
916 prompt "HPET Timer Support" if X86_32 <<
917 help <<
918 Use the IA-PC HPET (High Precision E <<
919 time in preference to the PIT and RT <<
920 present. <<
921 HPET is the next generation timer re <<
922 The HPET provides a stable time base <<
923 systems, unlike the TSC, but it is m <<
924 as it is off-chip. The interface us <<
925 in the HPET spec, revision 1. <<
926 <<
927 You can safely choose Y here. Howev <<
928 activated if the platform and the BI <<
929 Otherwise the 8254 will be used for <<
930 <<
931 Choose N to continue using the legac <<
932 <<
933 config HPET_EMULATE_RTC <<
934 def_bool y <<
935 depends on HPET_TIMER && (RTC_DRV_CMOS <<
936 <<
937 # Mark as expert because too many people got i <<
938 # The code disables itself when not needed. <<
939 config DMI <<
940 default y 72 default y
941 select DMI_SCAN_MACHINE_NON_EFI_FALLBA <<
942 bool "Enable DMI scanning" if EXPERT <<
943 help <<
944 Enabled scanning of DMI to identify <<
945 here unless you have verified that y <<
946 affected by entries in the DMI black <<
947 BIOS code. <<
948 <<
949 config GART_IOMMU <<
950 bool "Old AMD GART IOMMU support" <<
951 select IOMMU_HELPER <<
952 select SWIOTLB <<
953 depends on X86_64 && PCI && AMD_NB <<
954 help <<
955 Provides a driver for older AMD Athl <<
956 GART based hardware IOMMUs. <<
957 <<
958 The GART supports full DMA access fo <<
959 limitations, on systems with more th <<
960 for USB, sound, many IDE/SATA chipse <<
961 73
962 Newer systems typically have a moder !! 74 config PGTABLE_LEVELS
963 the CONFIG_AMD_IOMMU=y config option <<
964 <<
965 In normal configurations this driver <<
966 there's more than 3 GB of memory and <<
967 32-bit limited device. <<
968 <<
969 If unsure, say Y. <<
970 <<
971 config BOOT_VESA_SUPPORT <<
972 bool <<
973 help <<
974 If true, at least one selected frame <<
975 of VESA video modes set at an early <<
976 <<
977 config MAXSMP <<
978 bool "Enable Maximum number of SMP Pro <<
979 depends on X86_64 && SMP && DEBUG_KERN <<
980 select CPUMASK_OFFSTACK <<
981 help <<
982 Enable maximum number of CPUS and NU <<
983 If unsure, say N. <<
984 <<
985 # <<
986 # The maximum number of CPUs supported: <<
987 # <<
988 # The main config value is NR_CPUS, which defa <<
989 # and which can be configured interactively in <<
990 # [NR_CPUS_RANGE_BEGIN ... NR_CPUS_RANGE_END] <<
991 # <<
992 # The ranges are different on 32-bit and 64-bi <<
993 # hardware capabilities and scalability featur <<
994 # <<
995 # ( If MAXSMP is enabled we just use the highe <<
996 # interactive configuration. ) <<
997 # <<
998 <<
999 config NR_CPUS_RANGE_BEGIN <<
1000 int <<
1001 default NR_CPUS_RANGE_END if MAXSMP <<
1002 default 1 if !SMP <<
1003 default 2 <<
1004 <<
1005 config NR_CPUS_RANGE_END <<
1006 int <<
1007 depends on X86_32 <<
1008 default 64 if SMP && X86_BIGSMP <<
1009 default 8 if SMP && !X86_BIGSMP <<
1010 default 1 if !SMP <<
1011 <<
1012 config NR_CPUS_RANGE_END <<
1013 int <<
1014 depends on X86_64 <<
1015 default 8192 if SMP && CPUMASK_OFFST <<
1016 default 512 if SMP && !CPUMASK_OFFS <<
1017 default 1 if !SMP <<
1018 <<
1019 config NR_CPUS_DEFAULT <<
1020 int <<
1021 depends on X86_32 <<
1022 default 32 if X86_BIGSMP <<
1023 default 8 if SMP <<
1024 default 1 if !SMP <<
1025 <<
1026 config NR_CPUS_DEFAULT <<
1027 int 75 int
1028 depends on X86_64 !! 76 default 3
1029 default 8192 if MAXSMP <<
1030 default 64 if SMP <<
1031 default 1 if !SMP <<
1032 <<
1033 config NR_CPUS <<
1034 int "Maximum number of CPUs" if SMP & <<
1035 range NR_CPUS_RANGE_BEGIN NR_CPUS_RAN <<
1036 default NR_CPUS_DEFAULT <<
1037 help <<
1038 This allows you to specify the maxi <<
1039 kernel will support. If CPUMASK_OF <<
1040 supported value is 8192, otherwise <<
1041 minimum value which makes sense is <<
1042 <<
1043 This is purely to save memory: each <<
1044 to the kernel image. <<
1045 <<
1046 config SCHED_CLUSTER <<
1047 bool "Cluster scheduler support" <<
1048 depends on SMP <<
1049 default y <<
1050 help <<
1051 Cluster scheduler support improves <<
1052 making when dealing with machines t <<
1053 Cluster usually means a couple of C <<
1054 by sharing mid-level caches, last-l <<
1055 busses. <<
1056 <<
1057 config SCHED_SMT <<
1058 def_bool y if SMP <<
1059 <<
1060 config SCHED_MC <<
1061 def_bool y <<
1062 prompt "Multi-core scheduler support" <<
1063 depends on SMP <<
1064 help <<
1065 Multi-core scheduler support improv <<
1066 making when dealing with multi-core <<
1067 increased overhead in some places. <<
1068 <<
1069 config SCHED_MC_PRIO <<
1070 bool "CPU core priorities scheduler s <<
1071 depends on SCHED_MC <<
1072 select X86_INTEL_PSTATE if CPU_SUP_IN <<
1073 select X86_AMD_PSTATE if CPU_SUP_AMD <<
1074 select CPU_FREQ <<
1075 default y <<
1076 help <<
1077 Intel Turbo Boost Max Technology 3. <<
1078 core ordering determined at manufac <<
1079 certain cores to reach higher turbo <<
1080 single threaded workloads) than oth <<
1081 <<
1082 Enabling this kernel feature teache <<
1083 the TBM3 (aka ITMT) priority order <<
1084 scheduler's CPU selection logic acc <<
1085 overall system performance can be a <<
1086 <<
1087 This feature will have no effect on <<
1088 <<
1089 If unsure say Y here. <<
1090 <<
1091 config UP_LATE_INIT <<
1092 def_bool y <<
1093 depends on !SMP && X86_LOCAL_APIC <<
1094 <<
1095 config X86_UP_APIC <<
1096 bool "Local APIC support on uniproces <<
1097 default PCI_MSI <<
1098 depends on X86_32 && !SMP && !X86_32_ <<
1099 help <<
1100 A local APIC (Advanced Programmable <<
1101 integrated interrupt controller in <<
1102 system which has a processor with a <<
1103 enable and use it. If you say Y her <<
1104 have a local APIC, then the kernel <<
1105 all. The local APIC supports CPU-ge <<
1106 performance counters), and the NMI <<
1107 lockups. <<
1108 <<
1109 config X86_UP_IOAPIC <<
1110 bool "IO-APIC support on uniprocessor <<
1111 depends on X86_UP_APIC <<
1112 help <<
1113 An IO-APIC (I/O Advanced Programmab <<
1114 SMP-capable replacement for PC-styl <<
1115 SMP systems and many recent uniproc <<
1116 <<
1117 If you have a single-CPU system wit <<
1118 to use it. If you say Y here even t <<
1119 an IO-APIC, then the kernel will st <<
1120 77
1121 config X86_LOCAL_APIC !! 78 config AUDIT_ARCH
1122 def_bool y <<
1123 depends on X86_64 || SMP || X86_32_NO <<
1124 select IRQ_DOMAIN_HIERARCHY <<
1125 <<
1126 config ACPI_MADT_WAKEUP <<
1127 def_bool y <<
1128 depends on X86_64 <<
1129 depends on ACPI <<
1130 depends on SMP <<
1131 depends on X86_LOCAL_APIC <<
1132 <<
1133 config X86_IO_APIC <<
1134 def_bool y <<
1135 depends on X86_LOCAL_APIC || X86_UP_I <<
1136 <<
1137 config X86_REROUTE_FOR_BROKEN_BOOT_IRQS <<
1138 bool "Reroute for broken boot IRQs" <<
1139 depends on X86_IO_APIC <<
1140 help <<
1141 This option enables a workaround th <<
1142 spurious interrupts. This is recomm <<
1143 interrupt handling is used on syste <<
1144 superfluous "boot interrupts" canno <<
1145 <<
1146 Some chipsets generate a legacy INT <<
1147 entry in the chipset's IO-APIC is m <<
1148 kernel does during interrupt handli <<
1149 boot IRQ generation cannot be disab <<
1150 the original IRQ line masked so tha <<
1151 IRQ" is delivered to the CPUs. The <<
1152 kernel to set up the IRQ handler on <<
1153 way only one interrupt is delivered <<
1154 the spurious second interrupt may c <<
1155 down (vital) interrupt lines. <<
1156 <<
1157 Only affects "broken" chipsets. Int <<
1158 increased on these systems. <<
1159 <<
1160 config X86_MCE <<
1161 bool "Machine Check / overheating rep <<
1162 select GENERIC_ALLOCATOR <<
1163 default y <<
1164 help <<
1165 Machine Check support allows the pr <<
1166 kernel if it detects a problem (e.g <<
1167 The action the kernel takes depends <<
1168 ranging from warning messages to ha <<
1169 <<
1170 config X86_MCELOG_LEGACY <<
1171 bool "Support for deprecated /dev/mce <<
1172 depends on X86_MCE <<
1173 help <<
1174 Enable support for /dev/mcelog whic <<
1175 userspace logging daemon. Consider <<
1176 rasdaemon solution. <<
1177 <<
1178 config X86_MCE_INTEL <<
1179 def_bool y <<
1180 prompt "Intel MCE features" <<
1181 depends on X86_MCE && X86_LOCAL_APIC <<
1182 help <<
1183 Additional support for intel specif <<
1184 the thermal monitor. <<
1185 <<
1186 config X86_MCE_AMD <<
1187 def_bool y <<
1188 prompt "AMD MCE features" <<
1189 depends on X86_MCE && X86_LOCAL_APIC <<
1190 help <<
1191 Additional support for AMD specific <<
1192 the DRAM Error Threshold. <<
1193 <<
1194 config X86_ANCIENT_MCE <<
1195 bool "Support for old Pentium 5 / Win <<
1196 depends on X86_32 && X86_MCE <<
1197 help <<
1198 Include support for machine check h <<
1199 systems. These typically need to be <<
1200 line. <<
1201 <<
1202 config X86_MCE_THRESHOLD <<
1203 depends on X86_MCE_AMD || X86_MCE_INT <<
1204 def_bool y <<
1205 <<
1206 config X86_MCE_INJECT <<
1207 depends on X86_MCE && X86_LOCAL_APIC <<
1208 tristate "Machine check injector supp <<
1209 help <<
1210 Provide support for injecting machi <<
1211 If you don't know what a machine ch <<
1212 QA it is safe to say n. <<
1213 <<
1214 source "arch/x86/events/Kconfig" <<
1215 <<
1216 config X86_LEGACY_VM86 <<
1217 bool "Legacy VM86 support" <<
1218 depends on X86_32 <<
1219 help <<
1220 This option allows user programs to <<
1221 mode, which is an 80286-era approxi <<
1222 <<
1223 Some very old versions of X and/or <<
1224 for user mode setting. Similarly, <<
1225 available to accelerate real mode D <<
1226 recent version of DOSEMU, X, or vbe <<
1227 functional even without kernel VM86 <<
1228 fall back to software emulation. Ne <<
1229 a 16-bit DOS program where 16-bit p <<
1230 mode might be faster than emulation <<
1231 enable this option. <<
1232 <<
1233 Note that any app that works on a 6 <<
1234 need this option, as 64-bit kernels <<
1235 V8086 mode. This option is also unr <<
1236 mode and is not needed to run most <<
1237 <<
1238 Enabling this option increases the <<
1239 and slows down exception handling a <<
1240 <<
1241 If unsure, say N here. <<
1242 <<
1243 config VM86 <<
1244 bool 79 bool
1245 default X86_LEGACY_VM86 <<
1246 80
1247 config X86_16BIT !! 81 menu "System setup"
1248 bool "Enable support for 16-bit segme <<
1249 default y <<
1250 depends on MODIFY_LDT_SYSCALL <<
1251 help <<
1252 This option is required by programs <<
1253 protected mode legacy code on x86 p <<
1254 this option saves about 300 bytes o <<
1255 plus 16K runtime memory on x86-64, <<
1256 82
1257 config X86_ESPFIX32 !! 83 choice
1258 def_bool y !! 84 prompt "Alpha system type"
1259 depends on X86_16BIT && X86_32 !! 85 default ALPHA_GENERIC
1260 !! 86 ---help---
1261 config X86_ESPFIX64 !! 87 This is the system type of your hardware. A "generic" kernel will
1262 def_bool y !! 88 run on any supported Alpha system. However, if you configure a
1263 depends on X86_16BIT && X86_64 !! 89 kernel for your specific system, it will be faster and smaller.
1264 !! 90
1265 config X86_VSYSCALL_EMULATION !! 91 To find out what type of Alpha system you have, you may want to
1266 bool "Enable vsyscall emulation" if E !! 92 check out the Linux/Alpha FAQ, accessible on the WWW from
1267 default y !! 93 <http://www.alphalinux.org/>. In summary:
1268 depends on X86_64 !! 94
>> 95 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366
>> 96 Alpha-XL XL-233, XL-266
>> 97 AlphaBook1 Alpha laptop
>> 98 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
>> 99 Cabriolet AlphaPC64, AlphaPCI64
>> 100 DP264 DP264 / DS20 / ES40 / DS10 / DS10L
>> 101 EB164 EB164 21164 evaluation board
>> 102 EB64+ EB64+ 21064 evaluation board
>> 103 EB66 EB66 21066 evaluation board
>> 104 EB66+ EB66+ 21066 evaluation board
>> 105 Jensen DECpc 150, DEC 2000 models 300, 500
>> 106 LX164 AlphaPC164-LX
>> 107 Lynx AS 2100A
>> 108 Miata Personal Workstation 433/500/600 a/au
>> 109 Marvel AlphaServer ES47 / ES80 / GS1280
>> 110 Mikasa AS 1000
>> 111 Noname AXPpci33, UDB (Multia)
>> 112 Noritake AS 1000A, AS 600A, AS 800
>> 113 PC164 AlphaPC164
>> 114 Rawhide AS 1200, AS 4000, AS 4100
>> 115 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX
>> 116 SX164 AlphaPC164-SX
>> 117 Sable AS 2000, AS 2100
>> 118 Shark DS 20L
>> 119 Takara Takara (OEM)
>> 120 Titan AlphaServer ES45 / DS25 / DS15
>> 121 Wildfire AlphaServer GS 40/80/160/320
>> 122
>> 123 If you don't know what to do, choose "generic".
>> 124
>> 125 config ALPHA_GENERIC
>> 126 bool "Generic"
>> 127 depends on TTY
>> 128 select HAVE_EISA
1269 help 129 help
1270 This enables emulation of the legac !! 130 A generic kernel will run on all supported Alpha hardware.
1271 it is roughly equivalent to booting <<
1272 that it will also disable the helpf <<
1273 tries to use a vsyscall. With this <<
1274 programs will just segfault, citing <<
1275 0xffffffffff600?00. <<
1276 131
1277 This option is required by many pro !! 132 config ALPHA_ALCOR
1278 care should be used even with newer !! 133 bool "Alcor/Alpha-XLT"
1279 !! 134 select HAVE_EISA
1280 Disabling this option saves about 7 <<
1281 possibly 4K of additional runtime p <<
1282 <<
1283 config X86_IOPL_IOPERM <<
1284 bool "IOPERM and IOPL Emulation" <<
1285 default y <<
1286 help 135 help
1287 This enables the ioperm() and iopl( !! 136 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
1288 for legacy applications. !! 137 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
1289 !! 138 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
1290 Legacy IOPL support is an overbroad !! 139 controller (256-bit memory bus) and a PCI interface. It also does
1291 space aside of accessing all 65536 !! 140 all the work required to support an external Bcache and to maintain
1292 interrupts. To gain this access the !! 141 memory coherence when a PCI device DMAs into (or out of) memory.
1293 capabilities and permission from po <<
1294 modules. <<
1295 142
1296 The emulation restricts the functio !! 143 config ALPHA_XL
1297 only allowing the full range I/O po !! 144 bool "Alpha-XL"
1298 ability to disable interrupts from <<
1299 granted if the hardware IOPL mechan <<
1300 <<
1301 config TOSHIBA <<
1302 tristate "Toshiba Laptop support" <<
1303 depends on X86_32 <<
1304 help 145 help
1305 This adds a driver to safely access !! 146 XL-233 and XL-266-based Alpha systems.
1306 the CPU on Toshiba portables with a <<
1307 not work on models with a Phoenix B <<
1308 is used to set the BIOS and power s <<
1309 <<
1310 For information on utilities to mak <<
1311 Toshiba Linux utilities web site at <<
1312 <http://www.buzzard.org.uk/toshiba/ <<
1313 147
1314 Say Y if you intend to run this ker !! 148 config ALPHA_BOOK1
1315 Say N otherwise. !! 149 bool "AlphaBook1"
1316 <<
1317 config X86_REBOOTFIXUPS <<
1318 bool "Enable X86 board specific fixup <<
1319 depends on X86_32 <<
1320 help 150 help
1321 This enables chipset and/or board s !! 151 Dec AlphaBook1/Burns Alpha-based laptops.
1322 in order to get reboot to work corr <<
1323 some combinations of hardware and B <<
1324 this config is intended, is when re <<
1325 system. <<
1326 <<
1327 Currently, the only fixup is for th <<
1328 CS5530A and CS5536 chipsets and the <<
1329 152
1330 Say Y if you want to enable the fix !! 153 config ALPHA_AVANTI_CH
1331 enable this option even if you don' !! 154 bool "Avanti"
1332 Say N otherwise. <<
1333 155
1334 config MICROCODE !! 156 config ALPHA_CABRIOLET
1335 def_bool y !! 157 bool "Cabriolet"
1336 depends on CPU_SUP_AMD || CPU_SUP_INT <<
1337 <<
1338 config MICROCODE_INITRD32 <<
1339 def_bool y <<
1340 depends on MICROCODE && X86_32 && BLK <<
1341 <<
1342 config MICROCODE_LATE_LOADING <<
1343 bool "Late microcode loading (DANGERO <<
1344 default n <<
1345 depends on MICROCODE && SMP <<
1346 help 158 help
1347 Loading microcode late, when the sy !! 159 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now
1348 is a tricky business and should be !! 160 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
1349 of synchronizing all cores and SMT !! 161 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
1350 not guarantee that cores might not !! 162 Bcache SIMMs. Requires power supply with 3.3V output.
1351 use this at your own risk. Late loa <<
1352 microcode header indicates that it <<
1353 minimal revision check. This minima <<
1354 the kernel command line with "micro <<
1355 <<
1356 config MICROCODE_LATE_FORCE_MINREV <<
1357 bool "Enforce late microcode loading <<
1358 default n <<
1359 depends on MICROCODE_LATE_LOADING <<
1360 help <<
1361 To prevent that users load microcod <<
1362 in use features, newer microcode pa <<
1363 in the microcode header, which tell <<
1364 revision must be active in the CPU <<
1365 late into the running system. If di <<
1366 be enforced but the kernel will be <<
1367 revision check fails. <<
1368 <<
1369 This minimal revision check can als <<
1370 "microcode.minrev" parameter on the <<
1371 <<
1372 If unsure say Y. <<
1373 <<
1374 config X86_MSR <<
1375 tristate "/dev/cpu/*/msr - Model-spec <<
1376 help <<
1377 This device gives privileged proces <<
1378 Model-Specific Registers (MSRs). I <<
1379 major 202 and minors 0 to 31 for /d <<
1380 MSR accesses are directed to a spec <<
1381 systems. <<
1382 163
1383 config X86_CPUID !! 164 config ALPHA_DP264
1384 tristate "/dev/cpu/*/cpuid - CPU info !! 165 bool "DP264"
1385 help 166 help
1386 This device gives processes access !! 167 Various 21264 systems with the tsunami core logic chipset.
1387 be executed on a specific processor !! 168 API Networks: 264DP, UP2000(+), CS20;
1388 with major 203 and minors 0 to 31 f !! 169 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
1389 /dev/cpu/31/cpuid. <<
1390 170
1391 choice !! 171 config ALPHA_EB164
1392 prompt "High Memory Support" !! 172 bool "EB164"
1393 default HIGHMEM4G <<
1394 depends on X86_32 <<
1395 <<
1396 config NOHIGHMEM <<
1397 bool "off" <<
1398 help <<
1399 Linux can use up to 64 Gigabytes of <<
1400 However, the address space of 32-bi <<
1401 Gigabytes large. That means that, i <<
1402 physical memory, not all of it can <<
1403 kernel. The physical memory that's <<
1404 "high memory". <<
1405 <<
1406 If you are compiling a kernel which <<
1407 more than 1 Gigabyte total physical <<
1408 choice and suitable for most users) <<
1409 split: 3GB are mapped so that each <<
1410 space and the remaining part of the <<
1411 by the kernel to permanently map as <<
1412 possible. <<
1413 <<
1414 If the machine has between 1 and 4 <<
1415 answer "4GB" here. <<
1416 <<
1417 If more than 4 Gigabytes is used th <<
1418 selection turns Intel PAE (Physical <<
1419 PAE implements 3-level paging on IA <<
1420 supported by Linux, PAE mode is imp <<
1421 processors (Pentium Pro and better) <<
1422 then the kernel will not boot on CP <<
1423 <<
1424 The actual amount of total physical <<
1425 auto detected or can be forced by u <<
1426 such as "mem=256M". (Try "man bootp <<
1427 your boot loader (lilo or loadlin) <<
1428 kernel at boot time.) <<
1429 <<
1430 If unsure, say "off". <<
1431 <<
1432 config HIGHMEM4G <<
1433 bool "4GB" <<
1434 help <<
1435 Select this if you have a 32-bit pr <<
1436 gigabytes of physical RAM. <<
1437 <<
1438 config HIGHMEM64G <<
1439 bool "64GB" <<
1440 depends on X86_HAVE_PAE <<
1441 select X86_PAE <<
1442 help 173 help
1443 Select this if you have a 32-bit pr !! 174 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has
1444 gigabytes of physical RAM. !! 175 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
1445 !! 176 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in
1446 endchoice !! 177 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
1447 !! 178 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized
1448 choice !! 179 motherboard. Requires power supply with 3.3V output.
1449 prompt "Memory split" if EXPERT <<
1450 default VMSPLIT_3G <<
1451 depends on X86_32 <<
1452 help <<
1453 Select the desired split between ke <<
1454 <<
1455 If the address range available to t <<
1456 physical memory installed, the rema <<
1457 as "high memory". Accessing high me <<
1458 than low memory, as it needs to be <<
1459 Note that increasing the kernel add <<
1460 available to user programs, making <<
1461 tighter. Selecting anything other <<
1462 will also likely make your kernel i <<
1463 kernel modules. <<
1464 <<
1465 If you are not absolutely sure what <<
1466 option alone! <<
1467 <<
1468 config VMSPLIT_3G <<
1469 bool "3G/1G user/kernel split <<
1470 config VMSPLIT_3G_OPT <<
1471 depends on !X86_PAE <<
1472 bool "3G/1G user/kernel split <<
1473 config VMSPLIT_2G <<
1474 bool "2G/2G user/kernel split <<
1475 config VMSPLIT_2G_OPT <<
1476 depends on !X86_PAE <<
1477 bool "2G/2G user/kernel split <<
1478 config VMSPLIT_1G <<
1479 bool "1G/3G user/kernel split <<
1480 endchoice <<
1481 <<
1482 config PAGE_OFFSET <<
1483 hex <<
1484 default 0xB0000000 if VMSPLIT_3G_OPT <<
1485 default 0x80000000 if VMSPLIT_2G <<
1486 default 0x78000000 if VMSPLIT_2G_OPT <<
1487 default 0x40000000 if VMSPLIT_1G <<
1488 default 0xC0000000 <<
1489 depends on X86_32 <<
1490 <<
1491 config HIGHMEM <<
1492 def_bool y <<
1493 depends on X86_32 && (HIGHMEM64G || H <<
1494 180
1495 config X86_PAE !! 181 config ALPHA_EB64P_CH
1496 bool "PAE (Physical Address Extension !! 182 bool "EB64+"
1497 depends on X86_32 && X86_HAVE_PAE <<
1498 select PHYS_ADDR_T_64BIT <<
1499 select SWIOTLB <<
1500 help <<
1501 PAE is required for NX support, and <<
1502 larger swapspace support for non-ov <<
1503 has the cost of more pagetable look <<
1504 consumes more pagetable space per p <<
1505 183
1506 config X86_5LEVEL !! 184 config ALPHA_EB66
1507 bool "Enable 5-level page tables supp !! 185 bool "EB66"
1508 default y <<
1509 select DYNAMIC_MEMORY_LAYOUT <<
1510 select SPARSEMEM_VMEMMAP <<
1511 depends on X86_64 <<
1512 help 186 help
1513 5-level paging enables access to la !! 187 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is
1514 up to 128 PiB of virtual address sp !! 188 identical to EB64+. Baby PC-AT size. Runs from standard PC power
1515 physical address space. !! 189 supply. The EB66 schematic was published as a marketing poster
1516 !! 190 advertising the 21066 as "the first microprocessor in the world with
1517 It will be supported by future Inte !! 191 embedded PCI".
1518 <<
1519 A kernel with the option enabled ca <<
1520 support 4- or 5-level paging. <<
1521 <<
1522 See Documentation/arch/x86/x86_64/5 <<
1523 information. <<
1524 192
1525 Say N if unsure. !! 193 config ALPHA_EB66P
1526 !! 194 bool "EB66+"
1527 config X86_DIRECT_GBPAGES <<
1528 def_bool y <<
1529 depends on X86_64 <<
1530 help 195 help
1531 Certain kernel features effectively !! 196 Later variant of the EB66 board.
1532 linear 1 GB mappings (even if the C <<
1533 supports them), so don't confuse th <<
1534 that we have them enabled. <<
1535 <<
1536 config X86_CPA_STATISTICS <<
1537 bool "Enable statistic for Change Pag <<
1538 depends on DEBUG_FS <<
1539 help <<
1540 Expose statistics about the Change <<
1541 helps to determine the effectivenes <<
1542 page mappings when mapping protecti <<
1543 <<
1544 config X86_MEM_ENCRYPT <<
1545 select ARCH_HAS_FORCE_DMA_UNENCRYPTED <<
1546 select DYNAMIC_PHYSICAL_MASK <<
1547 def_bool n <<
1548 <<
1549 config AMD_MEM_ENCRYPT <<
1550 bool "AMD Secure Memory Encryption (S <<
1551 depends on X86_64 && CPU_SUP_AMD <<
1552 depends on EFI_STUB <<
1553 select DMA_COHERENT_POOL <<
1554 select ARCH_USE_MEMREMAP_PROT <<
1555 select INSTRUCTION_DECODER <<
1556 select ARCH_HAS_CC_PLATFORM <<
1557 select X86_MEM_ENCRYPT <<
1558 select UNACCEPTED_MEMORY <<
1559 help <<
1560 Say yes to enable support for the e <<
1561 This requires an AMD processor that <<
1562 Encryption (SME). <<
1563 197
1564 # Common NUMA Features !! 198 config ALPHA_EIGER
1565 config NUMA !! 199 bool "Eiger"
1566 bool "NUMA Memory Allocation and Sche <<
1567 depends on SMP <<
1568 depends on X86_64 || (X86_32 && HIGHM <<
1569 default y if X86_BIGSMP <<
1570 select USE_PERCPU_NUMA_NODE_ID <<
1571 select OF_NUMA if OF <<
1572 help 200 help
1573 Enable NUMA (Non-Uniform Memory Acc !! 201 Apparently an obscure OEM single-board computer based on the
>> 202 Typhoon/Tsunami chipset family. Information on it is scanty.
1574 203
1575 The kernel will try to allocate mem !! 204 config ALPHA_JENSEN
1576 local memory controller of the CPU !! 205 bool "Jensen"
1577 NUMA awareness to the kernel. !! 206 depends on BROKEN
1578 !! 207 select HAVE_EISA
1579 For 64-bit this is recommended if t <<
1580 (or later), AMD Opteron, or EM64T N <<
1581 <<
1582 For 32-bit this is only needed if y <<
1583 kernel on a 64-bit NUMA platform. <<
1584 <<
1585 Otherwise, you should say N. <<
1586 <<
1587 config AMD_NUMA <<
1588 def_bool y <<
1589 prompt "Old style AMD Opteron NUMA de <<
1590 depends on X86_64 && NUMA && PCI <<
1591 help 208 help
1592 Enable AMD NUMA node topology detec !! 209 DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
1593 you have a multi processor AMD syst !! 210 of the first-generation Alpha systems. A number of these systems
1594 read the NUMA configuration directl !! 211 seem to be available on the second- hand market. The Jensen is a
1595 of Opteron. It is recommended to us !! 212 floor-standing tower system which originally used a 150MHz 21064 It
1596 which also takes priority if both a !! 213 used programmable logic to interface a 486 EISA I/O bridge to the
>> 214 CPU.
1597 215
1598 config X86_64_ACPI_NUMA !! 216 config ALPHA_LX164
1599 def_bool y !! 217 bool "LX164"
1600 prompt "ACPI NUMA detection" <<
1601 depends on X86_64 && NUMA && ACPI && <<
1602 select ACPI_NUMA <<
1603 help 218 help
1604 Enable ACPI SRAT based node topolog !! 219 A technical overview of this board is available at
>> 220 <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
1605 221
1606 config NODES_SHIFT !! 222 config ALPHA_LYNX
1607 int "Maximum NUMA Nodes (as a power o !! 223 bool "Lynx"
1608 range 1 10 !! 224 select HAVE_EISA
1609 default "10" if MAXSMP <<
1610 default "6" if X86_64 <<
1611 default "3" <<
1612 depends on NUMA <<
1613 help 225 help
1614 Specify the maximum number of NUMA !! 226 AlphaServer 2100A-based systems.
1615 system. Increases memory reserved <<
1616 227
1617 config ARCH_FLATMEM_ENABLE !! 228 config ALPHA_MARVEL
1618 def_bool y !! 229 bool "Marvel"
1619 depends on X86_32 && !NUMA <<
1620 <<
1621 config ARCH_SPARSEMEM_ENABLE <<
1622 def_bool y <<
1623 depends on X86_64 || NUMA || X86_32 | <<
1624 select SPARSEMEM_STATIC if X86_32 <<
1625 select SPARSEMEM_VMEMMAP_ENABLE if X8 <<
1626 <<
1627 config ARCH_SPARSEMEM_DEFAULT <<
1628 def_bool X86_64 || (NUMA && X86_32) <<
1629 <<
1630 config ARCH_SELECT_MEMORY_MODEL <<
1631 def_bool y <<
1632 depends on ARCH_SPARSEMEM_ENABLE && A <<
1633 <<
1634 config ARCH_MEMORY_PROBE <<
1635 bool "Enable sysfs memory/probe inter <<
1636 depends on MEMORY_HOTPLUG <<
1637 help 230 help
1638 This option enables a sysfs memory/ !! 231 AlphaServer ES47 / ES80 / GS1280 based on EV7.
1639 See Documentation/admin-guide/mm/me <<
1640 If you are unsure how to answer thi <<
1641 <<
1642 config ARCH_PROC_KCORE_TEXT <<
1643 def_bool y <<
1644 depends on X86_64 && PROC_KCORE <<
1645 <<
1646 config ILLEGAL_POINTER_VALUE <<
1647 hex <<
1648 default 0 if X86_32 <<
1649 default 0xdead000000000000 if X86_64 <<
1650 <<
1651 config X86_PMEM_LEGACY_DEVICE <<
1652 bool <<
1653 <<
1654 config X86_PMEM_LEGACY <<
1655 tristate "Support non-standard NVDIMM <<
1656 depends on PHYS_ADDR_T_64BIT <<
1657 depends on BLK_DEV <<
1658 select X86_PMEM_LEGACY_DEVICE <<
1659 select NUMA_KEEP_MEMINFO if NUMA <<
1660 select LIBNVDIMM <<
1661 help <<
1662 Treat memory marked using the non-s <<
1663 by the Intel Sandy Bridge-EP refere <<
1664 The kernel will offer these regions <<
1665 they can be used for persistent sto <<
1666 <<
1667 Say Y if unsure. <<
1668 <<
1669 config HIGHPTE <<
1670 bool "Allocate 3rd-level pagetables f <<
1671 depends on HIGHMEM <<
1672 help <<
1673 The VM uses one page table entry fo <<
1674 For systems with a lot of RAM, this <<
1675 low memory. Setting this option wi <<
1676 entries in high memory. <<
1677 <<
1678 config X86_CHECK_BIOS_CORRUPTION <<
1679 bool "Check for low memory corruption <<
1680 help <<
1681 Periodically check for memory corru <<
1682 is suspected to be caused by BIOS. <<
1683 configuration, it is disabled at ru <<
1684 setting "memory_corruption_check=1" <<
1685 line. By default it scans the low <<
1686 seconds; see the memory_corruption_ <<
1687 memory_corruption_check_period para <<
1688 Documentation/admin-guide/kernel-pa <<
1689 <<
1690 When enabled with the default param <<
1691 almost no overhead, as it reserves <<
1692 of memory and scans it infrequently <<
1693 and prevents it from affecting the <<
1694 <<
1695 It is, however, intended as a diagn <<
1696 BIOS-originated corruption always a <<
1697 you can use memmap= to prevent the <<
1698 memory. <<
1699 <<
1700 config X86_BOOTPARAM_MEMORY_CORRUPTION_CHECK <<
1701 bool "Set the default setting of memo <<
1702 depends on X86_CHECK_BIOS_CORRUPTION <<
1703 default y <<
1704 help <<
1705 Set whether the default state of me <<
1706 on or off. <<
1707 <<
1708 config MATH_EMULATION <<
1709 bool <<
1710 depends on MODIFY_LDT_SYSCALL <<
1711 prompt "Math emulation" if X86_32 && <<
1712 help <<
1713 Linux can emulate a math coprocesso <<
1714 operations) if you don't have one. <<
1715 a math coprocessor built in, 486SX <<
1716 a 487DX or 387, respectively. (The <<
1717 give you some hints here ["man dmes <<
1718 coprocessor or this emulation. <<
1719 <<
1720 If you don't have a math coprocesso <<
1721 say Y here even though you have a c <<
1722 be used nevertheless. (This behavio <<
1723 command line option "no387", which <<
1724 is broken. Try "man bootparam" or s <<
1725 loader (lilo or loadlin) about how <<
1726 boot time.) This means that it is a <<
1727 intend to use this kernel on differ <<
1728 232
1729 More information about the internal !! 233 config ALPHA_MIATA
1730 emulation can be found in <file:arc !! 234 bool "Miata"
1731 !! 235 select HAVE_EISA
1732 If you are not sure, say Y; apart f <<
1733 kernel, it won't hurt. <<
1734 <<
1735 config MTRR <<
1736 def_bool y <<
1737 prompt "MTRR (Memory Type Range Regis <<
1738 help 236 help
1739 On Intel P6 family processors (Pent !! 237 The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
1740 the Memory Type Range Registers (MT !! 238 or 600au).
1741 processor access to memory ranges. <<
1742 a video (VGA) card on a PCI or AGP <<
1743 allows bus write transfers to be co <<
1744 before bursting over the PCI/AGP bu <<
1745 of image write operations 2.5 times <<
1746 /proc/mtrr file which may be used t <<
1747 MTRRs. Typically the X server shoul <<
1748 <<
1749 This code has a reasonably generic <<
1750 control registers on other processo <<
1751 as well: <<
1752 <<
1753 The Cyrix 6x86, 6x86MX and M II pro <<
1754 Registers (ARRs) which provide a si <<
1755 these, the ARRs are used to emulate <<
1756 The AMD K6-2 (stepping 8 and above) <<
1757 MTRRs. The Centaur C6 (WinChip) has <<
1758 write-combining. All of these proce <<
1759 and it makes sense to say Y here if <<
1760 <<
1761 Saying Y here also fixes a problem <<
1762 set the MTRRs for the boot CPU and <<
1763 can lead to all sorts of problems, <<
1764 <<
1765 You can safely say Y even if your m <<
1766 just add about 9 KB to your kernel. <<
1767 239
1768 See <file:Documentation/arch/x86/mt !! 240 config ALPHA_MIKASA
1769 !! 241 bool "Mikasa"
1770 config MTRR_SANITIZER <<
1771 def_bool y <<
1772 prompt "MTRR cleanup support" <<
1773 depends on MTRR <<
1774 help 242 help
1775 Convert MTRR layout from continuous !! 243 AlphaServer 1000-based Alpha systems.
1776 add writeback entries. <<
1777 <<
1778 Can be disabled with disable_mtrr_c <<
1779 The largest mtrr entry size for a c <<
1780 mtrr_chunk_size. <<
1781 <<
1782 If unsure, say Y. <<
1783 244
1784 config MTRR_SANITIZER_ENABLE_DEFAULT !! 245 config ALPHA_NAUTILUS
1785 int "MTRR cleanup enable value (0-1)" !! 246 bool "Nautilus"
1786 range 0 1 <<
1787 default "0" <<
1788 depends on MTRR_SANITIZER <<
1789 help 247 help
1790 Enable mtrr cleanup default value !! 248 Alpha systems based on the AMD 751 & ALI 1543C chipsets.
1791 249
1792 config MTRR_SANITIZER_SPARE_REG_NR_DEFAULT !! 250 config ALPHA_NONAME_CH
1793 int "MTRR cleanup spare reg num (0-7) !! 251 bool "Noname"
1794 range 0 7 <<
1795 default "1" <<
1796 depends on MTRR_SANITIZER <<
1797 help <<
1798 mtrr cleanup spare entries default, <<
1799 mtrr_spare_reg_nr=N on the kernel c <<
1800 252
1801 config X86_PAT !! 253 config ALPHA_NORITAKE
1802 def_bool y !! 254 bool "Noritake"
1803 prompt "x86 PAT support" if EXPERT !! 255 select HAVE_EISA
1804 depends on MTRR <<
1805 select ARCH_USES_PG_ARCH_2 <<
1806 help 256 help
1807 Use PAT attributes to setup page le !! 257 AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
1808 !! 258 systems.
1809 PATs are the modern equivalents of <<
1810 flexible than MTRRs. <<
1811 259
1812 Say N here if you see bootup proble !! 260 config ALPHA_PC164
1813 spontaneous reboots) or a non-worki !! 261 bool "PC164"
1814 262
1815 If unsure, say Y. !! 263 config ALPHA_P2K
>> 264 bool "Platform2000"
1816 265
1817 config X86_UMIP !! 266 config ALPHA_RAWHIDE
1818 def_bool y !! 267 bool "Rawhide"
1819 prompt "User Mode Instruction Prevent !! 268 select HAVE_EISA
1820 help 269 help
1821 User Mode Instruction Prevention (U !! 270 AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
1822 some x86 processors. If enabled, a !! 271 See HOWTO at
1823 issued if the SGDT, SLDT, SIDT, SMS !! 272 <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
1824 executed in user mode. These instru <<
1825 information about the hardware stat <<
1826 <<
1827 The vast majority of applications d <<
1828 For the very few that do, software <<
1829 specific cases in protected and vir <<
1830 results are dummy. <<
1831 <<
1832 config CC_HAS_IBT <<
1833 # GCC >= 9 and binutils >= 2.29 <<
1834 # Retpoline check to work around http <<
1835 # Clang/LLVM >= 14 <<
1836 # https://github.com/llvm/llvm-projec <<
1837 # https://github.com/llvm/llvm-projec <<
1838 def_bool ((CC_IS_GCC && $(cc-option, <<
1839 (CC_IS_CLANG && CLANG_VERSI <<
1840 $(as-instr,endbr64) <<
1841 273
1842 config X86_CET !! 274 config ALPHA_RUFFIAN
1843 def_bool n !! 275 bool "Ruffian"
1844 help 276 help
1845 CET features configured (Shadow sta !! 277 Samsung APC164UX. There is a page on known problems and workarounds
>> 278 at <http://www.alphalinux.org/faq/FAQ-11.html>.
1846 279
1847 config X86_KERNEL_IBT !! 280 config ALPHA_RX164
1848 prompt "Indirect Branch Tracking" !! 281 bool "RX164"
1849 def_bool y <<
1850 depends on X86_64 && CC_HAS_IBT && HA <<
1851 # https://github.com/llvm/llvm-projec <<
1852 depends on !LD_IS_LLD || LLD_VERSION <<
1853 select OBJTOOL <<
1854 select X86_CET <<
1855 help <<
1856 Build the kernel with support for I <<
1857 hardware support course-grain forwa <<
1858 protection. It enforces that all in <<
1859 an ENDBR instruction, as such, the <<
1860 code with them to make this happen. <<
1861 <<
1862 In addition to building the kernel <<
1863 are not indirect call targets, avoi <<
1864 <<
1865 This requires LTO like objtool runs <<
1866 does significantly reduce the numbe <<
1867 kernel image. <<
1868 282
1869 config X86_INTEL_MEMORY_PROTECTION_KEYS !! 283 config ALPHA_SX164
1870 prompt "Memory Protection Keys" !! 284 bool "SX164"
1871 def_bool y <<
1872 # Note: only available in 64-bit mode <<
1873 depends on X86_64 && (CPU_SUP_INTEL | <<
1874 select ARCH_USES_HIGH_VMA_FLAGS <<
1875 select ARCH_HAS_PKEYS <<
1876 help <<
1877 Memory Protection Keys provides a m <<
1878 page-based protections, but without <<
1879 page tables when an application cha <<
1880 <<
1881 For details, see Documentation/core <<
1882 <<
1883 If unsure, say y. <<
1884 <<
1885 config ARCH_PKEY_BITS <<
1886 int <<
1887 default 4 <<
1888 285
1889 choice !! 286 config ALPHA_SABLE
1890 prompt "TSX enable mode" !! 287 bool "Sable"
1891 depends on CPU_SUP_INTEL !! 288 select HAVE_EISA
1892 default X86_INTEL_TSX_MODE_OFF <<
1893 help 289 help
1894 Intel's TSX (Transactional Synchron !! 290 Digital AlphaServer 2000 and 2100-based systems.
1895 allows to optimize locking protocol <<
1896 can lead to a noticeable performanc <<
1897 <<
1898 On the other hand it has been shown <<
1899 to form side channel attacks (e.g. <<
1900 will be more of those attacks disco <<
1901 <<
1902 Therefore TSX is not enabled by def <<
1903 might override this decision by tsx <<
1904 Even with TSX enabled, the kernel w <<
1905 possible TAA mitigation setting dep <<
1906 for the particular machine. <<
1907 291
1908 This option allows to set the defau !! 292 config ALPHA_SHARK
1909 and =auto. See Documentation/admin- !! 293 bool "Shark"
1910 details. <<
1911 294
1912 Say off if not sure, auto if TSX is !! 295 config ALPHA_TAKARA
1913 platforms or on if TSX is in use an !! 296 bool "Takara"
1914 relevant. <<
1915 <<
1916 config X86_INTEL_TSX_MODE_OFF <<
1917 bool "off" <<
1918 help <<
1919 TSX is disabled if possible - equal <<
1920 <<
1921 config X86_INTEL_TSX_MODE_ON <<
1922 bool "on" <<
1923 help 297 help
1924 TSX is always enabled on TSX capabl !! 298 Alpha 11164-based OEM single-board computer.
1925 line parameter. <<
1926 299
1927 config X86_INTEL_TSX_MODE_AUTO !! 300 config ALPHA_TITAN
1928 bool "auto" !! 301 bool "Titan"
1929 help 302 help
1930 TSX is enabled on TSX capable HW th !! 303 AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
1931 side channel attacks- equals the ts <<
1932 endchoice <<
1933 <<
1934 config X86_SGX <<
1935 bool "Software Guard eXtensions (SGX) <<
1936 depends on X86_64 && CPU_SUP_INTEL && <<
1937 depends on CRYPTO=y <<
1938 depends on CRYPTO_SHA256=y <<
1939 select MMU_NOTIFIER <<
1940 select NUMA_KEEP_MEMINFO if NUMA <<
1941 select XARRAY_MULTI <<
1942 help <<
1943 Intel(R) Software Guard eXtensions <<
1944 that can be used by applications to <<
1945 and data, referred to as enclaves. <<
1946 only be accessed by code running wi <<
1947 outside the enclave, including othe <<
1948 hardware. <<
1949 <<
1950 If unsure, say N. <<
1951 <<
1952 config X86_USER_SHADOW_STACK <<
1953 bool "X86 userspace shadow stack" <<
1954 depends on AS_WRUSS <<
1955 depends on X86_64 <<
1956 select ARCH_USES_HIGH_VMA_FLAGS <<
1957 select X86_CET <<
1958 help <<
1959 Shadow stack protection is a hardwa <<
1960 return address corruption. This he <<
1961 Applications must be enabled to use <<
1962 get protection "for free". <<
1963 <<
1964 CPUs supporting shadow stacks were <<
1965 304
1966 See Documentation/arch/x86/shstk.rs !! 305 config ALPHA_WILDFIRE
1967 !! 306 bool "Wildfire"
1968 If unsure, say N. <<
1969 <<
1970 config INTEL_TDX_HOST <<
1971 bool "Intel Trust Domain Extensions ( <<
1972 depends on CPU_SUP_INTEL <<
1973 depends on X86_64 <<
1974 depends on KVM_INTEL <<
1975 depends on X86_X2APIC <<
1976 select ARCH_KEEP_MEMBLOCK <<
1977 depends on CONTIG_ALLOC <<
1978 depends on !KEXEC_CORE <<
1979 depends on X86_MCE <<
1980 help <<
1981 Intel Trust Domain Extensions (TDX) <<
1982 host and certain physical attacks. <<
1983 support in the host kernel to run c <<
1984 <<
1985 If unsure, say N. <<
1986 <<
1987 config EFI <<
1988 bool "EFI runtime service support" <<
1989 depends on ACPI <<
1990 select UCS2_STRING <<
1991 select EFI_RUNTIME_WRAPPERS <<
1992 select ARCH_USE_MEMREMAP_PROT <<
1993 select EFI_RUNTIME_MAP if KEXEC_CORE <<
1994 help <<
1995 This enables the kernel to use EFI <<
1996 available (such as the EFI variable <<
1997 <<
1998 This option is only useful on syste <<
1999 In addition, you should use the lat <<
2000 at <http://elilo.sourceforge.net> i <<
2001 of EFI runtime services. However, e <<
2002 resultant kernel should continue to <<
2003 platforms. <<
2004 <<
2005 config EFI_STUB <<
2006 bool "EFI stub support" <<
2007 depends on EFI <<
2008 select RELOCATABLE <<
2009 help <<
2010 This kernel feature allows a bzImag <<
2011 by EFI firmware without the use of <<
2012 <<
2013 See Documentation/admin-guide/efi-s <<
2014 <<
2015 config EFI_HANDOVER_PROTOCOL <<
2016 bool "EFI handover protocol (DEPRECAT <<
2017 depends on EFI_STUB <<
2018 default y <<
2019 help <<
2020 Select this in order to include sup <<
2021 handover protocol, which defines al <<
2022 EFI stub. This is a practice that <<
2023 specification, and requires a prior <<
2024 bootloader about Linux/x86 specific <<
2025 and initrd, and where in memory tho <<
2026 <<
2027 If in doubt, say Y. Even though the <<
2028 present in upstream GRUB or other b <<
2029 GRUB with numerous downstream patch <<
2030 handover protocol as as result. <<
2031 <<
2032 config EFI_MIXED <<
2033 bool "EFI mixed-mode support" <<
2034 depends on EFI_STUB && X86_64 <<
2035 help <<
2036 Enabling this feature allows a 64-b <<
2037 on a 32-bit firmware, provided that <<
2038 mode. <<
2039 <<
2040 Note that it is not possible to boo <<
2041 kernel via the EFI boot stub - a bo <<
2042 the EFI handover protocol must be u <<
2043 <<
2044 If unsure, say N. <<
2045 <<
2046 config EFI_RUNTIME_MAP <<
2047 bool "Export EFI runtime maps to sysf <<
2048 depends on EFI <<
2049 help 307 help
2050 Export EFI runtime memory regions t !! 308 AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
2051 That memory map is required by the <<
2052 mappings after kexec, but can also <<
2053 <<
2054 See also Documentation/ABI/testing/ <<
2055 <<
2056 source "kernel/Kconfig.hz" <<
2057 <<
2058 config ARCH_SUPPORTS_KEXEC <<
2059 def_bool y <<
2060 <<
2061 config ARCH_SUPPORTS_KEXEC_FILE <<
2062 def_bool X86_64 <<
2063 <<
2064 config ARCH_SELECTS_KEXEC_FILE <<
2065 def_bool y <<
2066 depends on KEXEC_FILE <<
2067 select HAVE_IMA_KEXEC if IMA <<
2068 <<
2069 config ARCH_SUPPORTS_KEXEC_PURGATORY <<
2070 def_bool y <<
2071 <<
2072 config ARCH_SUPPORTS_KEXEC_SIG <<
2073 def_bool y <<
2074 <<
2075 config ARCH_SUPPORTS_KEXEC_SIG_FORCE <<
2076 def_bool y <<
2077 <<
2078 config ARCH_SUPPORTS_KEXEC_BZIMAGE_VERIFY_SIG <<
2079 def_bool y <<
2080 <<
2081 config ARCH_SUPPORTS_KEXEC_JUMP <<
2082 def_bool y <<
2083 <<
2084 config ARCH_SUPPORTS_CRASH_DUMP <<
2085 def_bool X86_64 || (X86_32 && HIGHMEM <<
2086 <<
2087 config ARCH_SUPPORTS_CRASH_HOTPLUG <<
2088 def_bool y <<
2089 <<
2090 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATI <<
2091 def_bool CRASH_RESERVE <<
2092 <<
2093 config PHYSICAL_START <<
2094 hex "Physical address where the kerne <<
2095 default "0x1000000" <<
2096 help <<
2097 This gives the physical address whe <<
2098 <<
2099 If the kernel is not relocatable (C <<
2100 will decompress itself to above phy <<
2101 Otherwise, bzImage will run from th <<
2102 by the boot loader. The only except <<
2103 above physical address, in which ca <<
2104 <<
2105 In normal kdump cases one does not <<
2106 as now bzImage can be compiled as a <<
2107 (CONFIG_RELOCATABLE=y) and be used <<
2108 address. This option is mainly usef <<
2109 to use a bzImage for capturing the <<
2110 vmlinux instead. vmlinux is not rel <<
2111 to be specifically compiled to run <<
2112 (normally a reserved region) and th <<
2113 <<
2114 So if you are using bzImage for cap <<
2115 leave the value here unchanged to 0 <<
2116 CONFIG_RELOCATABLE=y. Otherwise if <<
2117 for capturing the crash dump change <<
2118 the reserved region. In other word <<
2119 the "X" value as specified in the " <<
2120 command line boot parameter passed <<
2121 kernel. Please take a look at Docum <<
2122 for more details about crash dumps. <<
2123 <<
2124 Usage of bzImage for capturing the <<
2125 one does not have to build two kern <<
2126 as production kernel and capture ke <<
2127 gone away after relocatable bzImage <<
2128 is present because there are users <<
2129 vmlinux for dump capture. This opti <<
2130 line. <<
2131 <<
2132 Don't change this unless you know w <<
2133 <<
2134 config RELOCATABLE <<
2135 bool "Build a relocatable kernel" <<
2136 default y <<
2137 help <<
2138 This builds a kernel image that ret <<
2139 so it can be loaded someplace besid <<
2140 The relocations tend to make the ke <<
2141 but are discarded at runtime. <<
2142 <<
2143 One use is for the kexec on panic c <<
2144 must live at a different physical a <<
2145 kernel. <<
2146 <<
2147 Note: If CONFIG_RELOCATABLE=y, then <<
2148 it has been loaded at and the compi <<
2149 (CONFIG_PHYSICAL_START) is used as <<
2150 <<
2151 config RANDOMIZE_BASE <<
2152 bool "Randomize the address of the ke <<
2153 depends on RELOCATABLE <<
2154 default y <<
2155 help <<
2156 In support of Kernel Address Space <<
2157 this randomizes the physical addres <<
2158 is decompressed and the virtual add <<
2159 image is mapped, as a security feat <<
2160 attempts relying on knowledge of th <<
2161 code internals. <<
2162 <<
2163 On 64-bit, the kernel physical and <<
2164 randomized separately. The physical <<
2165 between 16MB and the top of physica <<
2166 virtual address will be randomized <<
2167 of entropy). Note that this also re <<
2168 available to kernel modules from 1. <<
2169 <<
2170 On 32-bit, the kernel physical and <<
2171 randomized together. They will be r <<
2172 512MB (8 bits of entropy). <<
2173 <<
2174 Entropy is generated using the RDRA <<
2175 supported. If RDTSC is supported, i <<
2176 the entropy pool as well. If neithe <<
2177 supported, then entropy is read fro <<
2178 usable entropy is limited by the ke <<
2179 2GB addressing, and that PHYSICAL_A <<
2180 minimum of 2MB. As a result, only 1 <<
2181 theoretically possible, but the imp <<
2182 limited due to memory layouts. <<
2183 <<
2184 If unsure, say Y. <<
2185 <<
2186 # Relocation on x86 needs some additional bui <<
2187 config X86_NEED_RELOCS <<
2188 def_bool y <<
2189 depends on RANDOMIZE_BASE || (X86_32 <<
2190 <<
2191 config PHYSICAL_ALIGN <<
2192 hex "Alignment value to which kernel <<
2193 default "0x200000" <<
2194 range 0x2000 0x1000000 if X86_32 <<
2195 range 0x200000 0x1000000 if X86_64 <<
2196 help <<
2197 This value puts the alignment restr <<
2198 where kernel is loaded and run from <<
2199 address which meets above alignment <<
2200 <<
2201 If bootloader loads the kernel at a <<
2202 CONFIG_RELOCATABLE is set, kernel w <<
2203 address aligned to above value and <<
2204 <<
2205 If bootloader loads the kernel at a <<
2206 CONFIG_RELOCATABLE is not set, kern <<
2207 load address and decompress itself <<
2208 compiled for and run from there. Th <<
2209 compiled already meets above alignm <<
2210 end result is that kernel runs from <<
2211 above alignment restrictions. <<
2212 <<
2213 On 32-bit this value must be a mult <<
2214 this value must be a multiple of 0x <<
2215 <<
2216 Don't change this unless you know w <<
2217 <<
2218 config DYNAMIC_MEMORY_LAYOUT <<
2219 bool <<
2220 help <<
2221 This option makes base addresses of <<
2222 __PAGE_OFFSET movable during boot. <<
2223 <<
2224 config RANDOMIZE_MEMORY <<
2225 bool "Randomize the kernel memory sec <<
2226 depends on X86_64 <<
2227 depends on RANDOMIZE_BASE <<
2228 select DYNAMIC_MEMORY_LAYOUT <<
2229 default RANDOMIZE_BASE <<
2230 help <<
2231 Randomizes the base virtual address <<
2232 (physical memory mapping, vmalloc & <<
2233 makes exploits relying on predictab <<
2234 <<
2235 The order of allocations remains un <<
2236 the same way as RANDOMIZE_BASE. Cur <<
2237 configuration have in average 30,00 <<
2238 addresses for each memory section. <<
2239 <<
2240 If unsure, say Y. <<
2241 <<
2242 config RANDOMIZE_MEMORY_PHYSICAL_PADDING <<
2243 hex "Physical memory mapping padding" <<
2244 depends on RANDOMIZE_MEMORY <<
2245 default "0xa" if MEMORY_HOTPLUG <<
2246 default "0x0" <<
2247 range 0x1 0x40 if MEMORY_HOTPLUG <<
2248 range 0x0 0x40 <<
2249 help <<
2250 Define the padding in terabytes add <<
2251 memory size during kernel memory ra <<
2252 for memory hotplug support but redu <<
2253 address randomization. <<
2254 <<
2255 If unsure, leave at the default val <<
2256 <<
2257 config ADDRESS_MASKING <<
2258 bool "Linear Address Masking support" <<
2259 depends on X86_64 <<
2260 depends on COMPILE_TEST || !CPU_MITIG <<
2261 help <<
2262 Linear Address Masking (LAM) modifi <<
2263 to 64-bit linear addresses, allowin <<
2264 untranslated address bits for metad <<
2265 <<
2266 The capability can be used for effi <<
2267 implementation and for optimization <<
2268 <<
2269 config HOTPLUG_CPU <<
2270 def_bool y <<
2271 depends on SMP <<
2272 <<
2273 config COMPAT_VDSO <<
2274 def_bool n <<
2275 prompt "Disable the 32-bit vDSO (need <<
2276 depends on COMPAT_32 <<
2277 help <<
2278 Certain buggy versions of glibc wil <<
2279 presented with a 32-bit vDSO that i <<
2280 indicated in its segment table. <<
2281 <<
2282 The bug was introduced by f866314b8 <<
2283 and fixed by 3b3ddb4f7db98ec9e912cc <<
2284 49ad572a70b8aeb91e57483a11dd1b77e31 <<
2285 the only released version with the <<
2286 contains a buggy "glibc 2.3.2". <<
2287 <<
2288 The symptom of the bug is that ever <<
2289 dl_main: Assertion `(void *) ph->p_ <<
2290 <<
2291 Saying Y here changes the default v <<
2292 option from 1 to 0, which turns off <<
2293 This works around the glibc bug but <<
2294 <<
2295 If unsure, say N: if you are compil <<
2296 are unlikely to be using a buggy ve <<
2297 <<
2298 choice <<
2299 prompt "vsyscall table for legacy app <<
2300 depends on X86_64 <<
2301 default LEGACY_VSYSCALL_XONLY <<
2302 help <<
2303 Legacy user code that does not know <<
2304 to be able to issue three syscalls <<
2305 kernel space. Since this location i <<
2306 it can be used to assist security v <<
2307 <<
2308 This setting can be changed at boot <<
2309 line parameter vsyscall=[emulate|xo <<
2310 is deprecated and can only be enabl <<
2311 line. <<
2312 <<
2313 On a system with recent enough glib <<
2314 static binaries, you can say None w <<
2315 to improve security. <<
2316 <<
2317 If unsure, select "Emulate executio <<
2318 <<
2319 config LEGACY_VSYSCALL_XONLY <<
2320 bool "Emulate execution only" <<
2321 help <<
2322 The kernel traps and emulat <<
2323 address mapping and does no <<
2324 configuration is recommende <<
2325 legacy vsyscall area but su <<
2326 instrumentation of legacy c <<
2327 certain uses of the vsyscal <<
2328 buffer. <<
2329 <<
2330 config LEGACY_VSYSCALL_NONE <<
2331 bool "None" <<
2332 help <<
2333 There will be no vsyscall m <<
2334 eliminate any risk of ASLR <<
2335 fixed address mapping. Atte <<
2336 will be reported to dmesg, <<
2337 malicious userspace program <<
2338 309
2339 endchoice 310 endchoice
2340 311
2341 config CMDLINE_BOOL !! 312 # clear all implied options (don't want default values for those):
2342 bool "Built-in kernel command line" !! 313 # Most of these machines have ISA slots; not exactly sure which don't,
2343 help !! 314 # and this doesn't activate hordes of code, so do it always.
2344 Allow for specifying boot arguments !! 315 config ISA
2345 build time. On some systems (e.g. !! 316 bool
2346 necessary or convenient to provide <<
2347 kernel boot arguments with the kern <<
2348 to not rely on the boot loader to p <<
2349 <<
2350 To compile command line arguments i <<
2351 set this option to 'Y', then fill i <<
2352 boot arguments in CONFIG_CMDLINE. <<
2353 <<
2354 Systems with fully functional boot <<
2355 should leave this option set to 'N' <<
2356 <<
2357 config CMDLINE <<
2358 string "Built-in kernel command strin <<
2359 depends on CMDLINE_BOOL <<
2360 default "" <<
2361 help <<
2362 Enter arguments here that should be <<
2363 image and used at boot time. If th <<
2364 command line at boot time, it is ap <<
2365 form the full kernel command line, <<
2366 <<
2367 However, you can use the CONFIG_CMD <<
2368 change this behavior. <<
2369 <<
2370 In most cases, the command line (wh <<
2371 by the boot loader) should specify <<
2372 file system. <<
2373 <<
2374 config CMDLINE_OVERRIDE <<
2375 bool "Built-in command line overrides <<
2376 depends on CMDLINE_BOOL && CMDLINE != <<
2377 help <<
2378 Set this option to 'Y' to have the <<
2379 command line, and use ONLY the buil <<
2380 <<
2381 This is used to work around broken <<
2382 be set to 'N' under normal conditio <<
2383 <<
2384 config MODIFY_LDT_SYSCALL <<
2385 bool "Enable the LDT (local descripto <<
2386 default y 317 default y
2387 help 318 help
2388 Linux can allow user programs to in !! 319 Find out whether you have ISA slots on your motherboard. ISA is the
2389 Local Descriptor Table (LDT) using !! 320 name of a bus system, i.e. the way the CPU talks to the other stuff
2390 call. This is required to run 16-b !! 321 inside your box. Other bus systems are PCI, EISA, MicroChannel
2391 DOSEMU or some Wine programs. It i !! 322 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
2392 threading libraries. !! 323 newer boards don't support it. If you have ISA, say Y, otherwise N.
2393 <<
2394 Enabling this feature adds a small <<
2395 context switches and increases the <<
2396 surface. Disabling it removes the <<
2397 <<
2398 Saying 'N' here may make sense for <<
2399 <<
2400 config STRICT_SIGALTSTACK_SIZE <<
2401 bool "Enforce strict size checking fo <<
2402 depends on DYNAMIC_SIGFRAME <<
2403 help <<
2404 For historical reasons MINSIGSTKSZ <<
2405 already too small with AVX512 suppo <<
2406 enforce strict checking of the siga <<
2407 real size of the FPU frame. This op <<
2408 by default. It can also be controll <<
2409 line option 'strict_sas_size' indep <<
2410 switch. Enabling it might break exi <<
2411 allocate a too small sigaltstack bu <<
2412 never get a signal delivered. <<
2413 <<
2414 Say 'N' unless you want to really e <<
2415 324
2416 config CFI_AUTO_DEFAULT !! 325 config ISA_DMA_API
2417 bool "Attempt to use FineIBT by defau !! 326 bool
2418 depends on FINEIBT <<
2419 default y 327 default y
2420 help <<
2421 Attempt to use FineIBT by default a <<
2422 this is the same as booting with "c <<
2423 this is the same as booting with "c <<
2424 <<
2425 source "kernel/livepatch/Kconfig" <<
2426 <<
2427 endmenu <<
2428 328
2429 config CC_HAS_NAMED_AS !! 329 config ALPHA_NONAME
2430 def_bool $(success,echo 'int __seg_fs !! 330 bool
2431 depends on CC_IS_GCC !! 331 depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
2432 <<
2433 config CC_HAS_NAMED_AS_FIXED_SANITIZERS <<
2434 def_bool CC_IS_GCC && GCC_VERSION >= <<
2435 <<
2436 config USE_X86_SEG_SUPPORT <<
2437 def_bool y <<
2438 depends on CC_HAS_NAMED_AS <<
2439 # <<
2440 # -fsanitize=kernel-address (KASAN) a <<
2441 # (KCSAN) are incompatible with named <<
2442 # GCC < 13.3 - see GCC PR sanitizer/1 <<
2443 # <<
2444 depends on !(KASAN || KCSAN) || CC_HA <<
2445 <<
2446 config CC_HAS_SLS <<
2447 def_bool $(cc-option,-mharden-sls=all <<
2448 <<
2449 config CC_HAS_RETURN_THUNK <<
2450 def_bool $(cc-option,-mfunction-retur <<
2451 <<
2452 config CC_HAS_ENTRY_PADDING <<
2453 def_bool $(cc-option,-fpatchable-func <<
2454 <<
2455 config FUNCTION_PADDING_CFI <<
2456 int <<
2457 default 59 if FUNCTION_ALIGNMENT_64B <<
2458 default 27 if FUNCTION_ALIGNMENT_32B <<
2459 default 11 if FUNCTION_ALIGNMENT_16B <<
2460 default 3 if FUNCTION_ALIGNMENT_8B <<
2461 default 0 <<
2462 <<
2463 # Basically: FUNCTION_ALIGNMENT - 5*CFI_CLANG <<
2464 # except Kconfig can't do arithmetic :/ <<
2465 config FUNCTION_PADDING_BYTES <<
2466 int <<
2467 default FUNCTION_PADDING_CFI if CFI_C <<
2468 default FUNCTION_ALIGNMENT <<
2469 <<
2470 config CALL_PADDING <<
2471 def_bool n <<
2472 depends on CC_HAS_ENTRY_PADDING && OB <<
2473 select FUNCTION_ALIGNMENT_16B <<
2474 <<
2475 config FINEIBT <<
2476 def_bool y <<
2477 depends on X86_KERNEL_IBT && CFI_CLAN <<
2478 select CALL_PADDING <<
2479 <<
2480 config HAVE_CALL_THUNKS <<
2481 def_bool y <<
2482 depends on CC_HAS_ENTRY_PADDING && MI <<
2483 <<
2484 config CALL_THUNKS <<
2485 def_bool n <<
2486 select CALL_PADDING <<
2487 <<
2488 config PREFIX_SYMBOLS <<
2489 def_bool y <<
2490 depends on CALL_PADDING && !CFI_CLANG <<
2491 <<
2492 menuconfig CPU_MITIGATIONS <<
2493 bool "Mitigations for CPU vulnerabili <<
2494 default y 332 default y
2495 help 333 help
2496 Say Y here to enable options which !! 334 The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
2497 vulnerabilities (usually related to !! 335 UDB). This design was produced by Digital's Technical OEM (TOEM)
2498 Mitigations can be disabled or rest !! 336 group. It uses the 21066 processor running at 166MHz or 233MHz. It
2499 via the "mitigations" kernel parame !! 337 is a baby-AT size, and runs from a standard PC power supply. It has
>> 338 5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
>> 339 2 versions, with either PS/2 or large DIN connectors for the
>> 340 keyboard.
2500 341
2501 If you say N, all mitigations will !! 342 config ALPHA_EV4
2502 overridden at runtime. !! 343 bool
2503 !! 344 depends on ALPHA_JENSEN || (ALPHA_SABLE && !ALPHA_GAMMA) || ALPHA_LYNX || ALPHA_NORITAKE && !ALPHA_PRIMO || ALPHA_MIKASA && !ALPHA_PRIMO || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL || ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
2504 Say 'Y', unless you really know wha !! 345 default y if !ALPHA_LYNX
2505 <<
2506 if CPU_MITIGATIONS <<
2507 346
2508 config MITIGATION_PAGE_TABLE_ISOLATION !! 347 config ALPHA_LCA
2509 bool "Remove the kernel mapping in us !! 348 bool
>> 349 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
2510 default y 350 default y
2511 depends on (X86_64 || X86_PAE) <<
2512 help <<
2513 This feature reduces the number of <<
2514 ensuring that the majority of kerne <<
2515 into userspace. <<
2516 351
2517 See Documentation/arch/x86/pti.rst !! 352 config ALPHA_APECS
>> 353 bool
>> 354 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
>> 355 default y
2518 356
2519 config MITIGATION_RETPOLINE !! 357 config ALPHA_EB64P
2520 bool "Avoid speculative indirect bran !! 358 bool
2521 select OBJTOOL if HAVE_OBJTOOL !! 359 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
2522 default y 360 default y
2523 help 361 help
2524 Compile kernel with the retpoline c !! 362 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA,
2525 kernel-to-user data leaks by avoidi !! 363 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
2526 branches. Requires a compiler with !! 364 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
2527 support for full protection. The ke !! 365 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
>> 366 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size.
>> 367 Runs from standard PC power supply.
2528 368
2529 config MITIGATION_RETHUNK !! 369 config ALPHA_EV5
2530 bool "Enable return-thunks" !! 370 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
2531 depends on MITIGATION_RETPOLINE && CC !! 371 default y if ALPHA_RX164 || ALPHA_RAWHIDE || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_SABLE && ALPHA_GAMMA || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
2532 select OBJTOOL if HAVE_OBJTOOL <<
2533 default y if X86_64 <<
2534 help <<
2535 Compile the kernel with the return- <<
2536 against kernel-to-user data leaks b <<
2537 Requires a compiler with -mfunction <<
2538 support for full protection. The ke <<
2539 372
2540 config MITIGATION_UNRET_ENTRY !! 373 config ALPHA_EV4
2541 bool "Enable UNRET on kernel entry" !! 374 bool
2542 depends on CPU_SUP_AMD && MITIGATION_ !! 375 default y if ALPHA_LYNX && !ALPHA_EV5
2543 default y <<
2544 help <<
2545 Compile the kernel with support for <<
2546 376
2547 config MITIGATION_CALL_DEPTH_TRACKING !! 377 config ALPHA_CIA
2548 bool "Mitigate RSB underflow with cal !! 378 bool
2549 depends on CPU_SUP_INTEL && HAVE_CALL !! 379 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
2550 select HAVE_DYNAMIC_FTRACE_NO_PATCHAB <<
2551 select CALL_THUNKS <<
2552 default y 380 default y
2553 help <<
2554 Compile the kernel with call depth <<
2555 SKL Return-Speculation-Buffer (RSB) <<
2556 mitigation is off by default and ne <<
2557 kernel command line via the retblee <<
2558 non-affected systems the overhead o <<
2559 the call depth tracking is using ru <<
2560 in a compiler generated padding are <<
2561 increases text size by ~5%. For non <<
2562 is unused. On affected SKL systems <<
2563 performance gain over the IBRS miti <<
2564 381
2565 config CALL_THUNKS_DEBUG !! 382 config ALPHA_EV56
2566 bool "Enable call thunks and call dep !! 383 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
2567 depends on MITIGATION_CALL_DEPTH_TRAC !! 384 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
2568 select FUNCTION_ALIGNMENT_32B <<
2569 default n <<
2570 help <<
2571 Enable call/ret counters for imbala <<
2572 a noisy dmesg about callthunks gene <<
2573 trouble shooting. The debug prints <<
2574 kernel command line with 'debug-cal <<
2575 Only enable this when you are debug <<
2576 creates a noticeable runtime overhe <<
2577 385
2578 config MITIGATION_IBPB_ENTRY !! 386 config ALPHA_EV56
2579 bool "Enable IBPB on kernel entry" !! 387 prompt "EV56 CPU (speed >= 333MHz)?"
2580 depends on CPU_SUP_AMD && X86_64 !! 388 depends on ALPHA_NORITAKE || ALPHA_PRIMO
2581 default y <<
2582 help <<
2583 Compile the kernel with support for <<
2584 389
2585 config MITIGATION_IBRS_ENTRY !! 390 config ALPHA_EV56
2586 bool "Enable IBRS on kernel entry" !! 391 prompt "EV56 CPU (speed >= 400MHz)?"
2587 depends on CPU_SUP_INTEL && X86_64 !! 392 depends on ALPHA_RAWHIDE
2588 default y <<
2589 help <<
2590 Compile the kernel with support for <<
2591 This mitigates both spectre_v2 and <<
2592 performance. <<
2593 393
2594 config MITIGATION_SRSO !! 394 config ALPHA_PRIMO
2595 bool "Mitigate speculative RAS overfl !! 395 bool "EV5 CPU daughtercard (model 5/xxx)?"
2596 depends on CPU_SUP_AMD && X86_64 && M !! 396 depends on ALPHA_NORITAKE || ALPHA_MIKASA
2597 default y <<
2598 help 397 help
2599 Enable the SRSO mitigation needed o !! 398 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
2600 399
2601 config MITIGATION_SLS !! 400 config ALPHA_GAMMA
2602 bool "Mitigate Straight-Line-Speculat !! 401 bool "EV5 CPU(s) (model 5/xxx)?"
2603 depends on CC_HAS_SLS && X86_64 !! 402 depends on ALPHA_SABLE
2604 select OBJTOOL if HAVE_OBJTOOL <<
2605 default n <<
2606 help 403 help
2607 Compile the kernel with straight-li !! 404 Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
2608 against straight line speculation. <<
2609 larger. <<
2610 405
2611 config MITIGATION_GDS !! 406 config ALPHA_GAMMA
2612 bool "Mitigate Gather Data Sampling" !! 407 bool
2613 depends on CPU_SUP_INTEL !! 408 depends on ALPHA_LYNX
2614 default y 409 default y
2615 help <<
2616 Enable mitigation for Gather Data S <<
2617 vulnerability which allows unprivil <<
2618 which was previously stored in vect <<
2619 instructions to infer the stale vec <<
2620 410
2621 config MITIGATION_RFDS !! 411 config ALPHA_T2
2622 bool "RFDS Mitigation" !! 412 bool
2623 depends on CPU_SUP_INTEL !! 413 depends on ALPHA_SABLE || ALPHA_LYNX
2624 default y 414 default y
2625 help <<
2626 Enable mitigation for Register File <<
2627 RFDS is a hardware vulnerability wh <<
2628 allows unprivileged speculative acc <<
2629 stored in floating point, vector an <<
2630 See also <file:Documentation/admin- <<
2631 415
2632 config MITIGATION_SPECTRE_BHI !! 416 config ALPHA_PYXIS
2633 bool "Mitigate Spectre-BHB (Branch Hi !! 417 bool
2634 depends on CPU_SUP_INTEL !! 418 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
2635 default y 419 default y
2636 help <<
2637 Enable BHI mitigations. BHI attacks <<
2638 where the branch history buffer is <<
2639 indirect branches. <<
2640 See <file:Documentation/admin-guide <<
2641 420
2642 config MITIGATION_MDS !! 421 config ALPHA_EV6
2643 bool "Mitigate Microarchitectural Dat !! 422 bool
2644 depends on CPU_SUP_INTEL !! 423 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
2645 default y 424 default y
2646 help <<
2647 Enable mitigation for Microarchitec <<
2648 a hardware vulnerability which allo <<
2649 to data which is available in vario <<
2650 See also <file:Documentation/admin- <<
2651 425
2652 config MITIGATION_TAA !! 426 config ALPHA_TSUNAMI
2653 bool "Mitigate TSX Asynchronous Abort !! 427 bool
2654 depends on CPU_SUP_INTEL !! 428 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
2655 default y 429 default y
2656 help <<
2657 Enable mitigation for TSX Asynchron <<
2658 vulnerability that allows unprivile <<
2659 which is available in various CPU i <<
2660 asynchronous aborts within an Intel <<
2661 See also <file:Documentation/admin- <<
2662 430
2663 config MITIGATION_MMIO_STALE_DATA !! 431 config ALPHA_EV67
2664 bool "Mitigate MMIO Stale Data hardwa !! 432 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
2665 depends on CPU_SUP_INTEL !! 433 default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
2666 default y <<
2667 help 434 help
2668 Enable mitigation for MMIO Stale Da !! 435 Is this a machine based on the EV67 core? If in doubt, select N here
2669 Stale Data Vulnerabilities are a cl !! 436 and the machine will be treated as an EV6.
2670 vulnerabilities that can expose dat <<
2671 attacker to have access to MMIO. <<
2672 See also <<
2673 <file:Documentation/admin-guide/hw- <<
2674 437
2675 config MITIGATION_L1TF !! 438 config ALPHA_MCPCIA
2676 bool "Mitigate L1 Terminal Fault (L1T !! 439 bool
2677 depends on CPU_SUP_INTEL !! 440 depends on ALPHA_RAWHIDE
2678 default y 441 default y
2679 help <<
2680 Mitigate L1 Terminal Fault (L1TF) h <<
2681 hardware vulnerability which allows <<
2682 available in the Level 1 Data Cache <<
2683 See <file:Documentation/admin-guide <<
2684 442
2685 config MITIGATION_RETBLEED !! 443 config ALPHA_POLARIS
2686 bool "Mitigate RETBleed hardware bug" !! 444 bool
2687 depends on (CPU_SUP_INTEL && MITIGATI !! 445 depends on ALPHA_RX164
2688 default y 446 default y
2689 help <<
2690 Enable mitigation for RETBleed (Arb <<
2691 with Return Instructions) vulnerabi <<
2692 execution attack which takes advant <<
2693 in many modern microprocessors, sim <<
2694 unprivileged attacker can use these <<
2695 memory security restrictions to gai <<
2696 that would otherwise be inaccessibl <<
2697 447
2698 config MITIGATION_SPECTRE_V1 !! 448 config ALPHA_IRONGATE
2699 bool "Mitigate SPECTRE V1 hardware bu !! 449 bool
>> 450 depends on ALPHA_NAUTILUS
2700 default y 451 default y
2701 help <<
2702 Enable mitigation for Spectre V1 (B <<
2703 class of side channel attacks that <<
2704 execution that bypasses conditional <<
2705 memory access bounds check. <<
2706 See also <file:Documentation/admin- <<
2707 452
2708 config MITIGATION_SPECTRE_V2 !! 453 config GENERIC_HWEIGHT
2709 bool "Mitigate SPECTRE V2 hardware bu !! 454 bool
2710 default y !! 455 default y if !ALPHA_EV67
2711 help <<
2712 Enable mitigation for Spectre V2 (B <<
2713 V2 is a class of side channel attac <<
2714 indirect branch predictors inside t <<
2715 attacks, the attacker can steer spe <<
2716 victim to gadget code by poisoning <<
2717 used for predicting indirect branch <<
2718 See also <file:Documentation/admin- <<
2719 456
2720 config MITIGATION_SRBDS !! 457 config ALPHA_AVANTI
2721 bool "Mitigate Special Register Buffe !! 458 bool
2722 depends on CPU_SUP_INTEL !! 459 depends on ALPHA_XL || ALPHA_AVANTI_CH
2723 default y 460 default y
2724 help 461 help
2725 Enable mitigation for Special Regis !! 462 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
2726 SRBDS is a hardware vulnerability t !! 463 Alphas. Info at
2727 Sampling (MDS) techniques to infer !! 464 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
2728 register accesses. An unprivileged <<
2729 from RDRAND and RDSEED executed on <<
2730 using MDS techniques. <<
2731 See also <<
2732 <file:Documentation/admin-guide/hw- <<
2733 465
2734 config MITIGATION_SSB !! 466 config ALPHA_BROKEN_IRQ_MASK
2735 bool "Mitigate Speculative Store Bypa !! 467 bool
>> 468 depends on ALPHA_GENERIC || ALPHA_PC164
2736 default y 469 default y
2737 help <<
2738 Enable mitigation for Speculative S <<
2739 hardware security vulnerability and <<
2740 of speculative execution in a simil <<
2741 security vulnerabilities. <<
2742 <<
2743 endif <<
2744 <<
2745 config ARCH_HAS_ADD_PAGES <<
2746 def_bool y <<
2747 depends on ARCH_ENABLE_MEMORY_HOTPLUG <<
2748 <<
2749 menu "Power management and ACPI options" <<
2750 <<
2751 config ARCH_HIBERNATION_HEADER <<
2752 def_bool y <<
2753 depends on HIBERNATION <<
2754 <<
2755 source "kernel/power/Kconfig" <<
2756 <<
2757 source "drivers/acpi/Kconfig" <<
2758 <<
2759 config X86_APM_BOOT <<
2760 def_bool y <<
2761 depends on APM <<
2762 470
2763 menuconfig APM !! 471 config VGA_HOSE
2764 tristate "APM (Advanced Power Managem !! 472 bool
2765 depends on X86_32 && PM_SLEEP !! 473 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
2766 help <<
2767 APM is a BIOS specification for sav <<
2768 techniques. This is mostly useful f <<
2769 APM compliant BIOSes. If you say Y <<
2770 reset after a RESUME operation, the <<
2771 battery status information, and use <<
2772 notification of APM "events" (e.g. <<
2773 <<
2774 If you select "Y" here, you can dis <<
2775 BIOS by passing the "apm=off" optio <<
2776 <<
2777 Note that the APM support is almost <<
2778 machines with more than one CPU. <<
2779 <<
2780 In order to use APM, you will need <<
2781 and more information, read <file:Do <<
2782 and the Battery Powered Linux mini- <<
2783 <http://www.tldp.org/docs.html#howt <<
2784 <<
2785 This driver does not spin down disk <<
2786 manpage ("man 8 hdparm") for that), <<
2787 VESA-compliant "green" monitors. <<
2788 <<
2789 This driver does not support the TI <<
2790 486/DX4/75 because they don't have <<
2791 desktop machines also don't have co <<
2792 may cause those machines to panic d <<
2793 <<
2794 Generally, if you don't have a batt <<
2795 much point in using this driver and <<
2796 random kernel OOPSes or reboots tha <<
2797 anything, try disabling/enabling th <<
2798 APM in your BIOS). <<
2799 <<
2800 Some other things you should try wh <<
2801 "weird" problems: <<
2802 <<
2803 1) make sure that you have enough s <<
2804 enabled. <<
2805 2) pass the "idle=poll" option to t <<
2806 3) switch on floating point emulati <<
2807 the "no387" option to the kernel <<
2808 4) pass the "floppy=nodma" option t <<
2809 5) pass the "mem=4M" option to the <<
2810 all but the first 4 MB of RAM) <<
2811 6) make sure that the CPU is not ov <<
2812 7) read the sig11 FAQ at <http://ww <<
2813 8) disable the cache from your BIOS <<
2814 9) install a fan for the video card <<
2815 10) install a better fan for the CP <<
2816 11) exchange RAM chips <<
2817 12) exchange the motherboard. <<
2818 <<
2819 To compile this driver as a module, <<
2820 module will be called apm. <<
2821 <<
2822 if APM <<
2823 <<
2824 config APM_IGNORE_USER_SUSPEND <<
2825 bool "Ignore USER SUSPEND" <<
2826 help <<
2827 This option will ignore USER SUSPEN <<
2828 compliant APM BIOS, you want to say <<
2829 series notebooks, it is necessary t <<
2830 <<
2831 config APM_DO_ENABLE <<
2832 bool "Enable PM at boot time" <<
2833 help <<
2834 Enable APM features at boot time. F <<
2835 specification: "When disabled, the <<
2836 power manage devices, enter the Sta <<
2837 State, or take power saving steps i <<
2838 This driver will make CPU Idle call <<
2839 feature is turned off -- see "Do CP <<
2840 should always save battery power, b <<
2841 will be dependent on your BIOS impl <<
2842 this option off if your computer ha <<
2843 support, or if it beeps continuousl <<
2844 this off if you have a NEC UltraLit <<
2845 T400CDT. This is off by default sin <<
2846 this feature. <<
2847 <<
2848 config APM_CPU_IDLE <<
2849 depends on CPU_IDLE <<
2850 bool "Make CPU Idle calls when idle" <<
2851 help <<
2852 Enable calls to APM CPU Idle/CPU Bu <<
2853 On some machines, this can activate <<
2854 a slowed CPU clock rate, when the m <<
2855 are made after the idle loop has ru <<
2856 333 mS). On some machines, this wil <<
2857 whenever the CPU becomes idle. (On <<
2858 this option does nothing.) <<
2859 <<
2860 config APM_DISPLAY_BLANK <<
2861 bool "Enable console blanking using A <<
2862 help <<
2863 Enable console blanking using the A <<
2864 turn off the LCD backlight when the <<
2865 virtual console blanks the screen. <<
2866 the virtual console screen blanker, <<
2867 when using the X Window system. Thi <<
2868 do with your VESA-compliant power-s <<
2869 option doesn't work for all laptops <<
2870 backlight at all, or it might print <<
2871 especially if you are using gpm. <<
2872 <<
2873 config APM_ALLOW_INTS <<
2874 bool "Allow interrupts during APM BIO <<
2875 help <<
2876 Normally we disable external interr <<
2877 the APM BIOS as a measure to lessen <<
2878 BIOS implementation. The BIOS shou <<
2879 needs to. Unfortunately, some BIOS <<
2880 many of the newer IBM Thinkpads. I <<
2881 suspend, try setting this to Y. Ot <<
2882 <<
2883 endif # APM <<
2884 <<
2885 source "drivers/cpufreq/Kconfig" <<
2886 <<
2887 source "drivers/cpuidle/Kconfig" <<
2888 <<
2889 source "drivers/idle/Kconfig" <<
2890 <<
2891 endmenu <<
2892 <<
2893 menu "Bus options (PCI etc.)" <<
2894 <<
2895 choice <<
2896 prompt "PCI access mode" <<
2897 depends on X86_32 && PCI <<
2898 default PCI_GOANY <<
2899 help <<
2900 On PCI systems, the BIOS can be use <<
2901 determine their configuration. Howe <<
2902 have BIOS bugs and may crash if thi <<
2903 PCI-based systems don't have any BI <<
2904 detect the PCI hardware directly wi <<
2905 <<
2906 With this option, you can specify h <<
2907 PCI devices. If you choose "BIOS", <<
2908 if you choose "Direct", the BIOS wo <<
2909 choose "MMConfig", then PCI Express <<
2910 If you choose "Any", the kernel wil <<
2911 direct access method and falls back <<
2912 work. If unsure, go with the defaul <<
2913 <<
2914 config PCI_GOBIOS <<
2915 bool "BIOS" <<
2916 <<
2917 config PCI_GOMMCONFIG <<
2918 bool "MMConfig" <<
2919 <<
2920 config PCI_GODIRECT <<
2921 bool "Direct" <<
2922 <<
2923 config PCI_GOOLPC <<
2924 bool "OLPC XO-1" <<
2925 depends on OLPC <<
2926 <<
2927 config PCI_GOANY <<
2928 bool "Any" <<
2929 <<
2930 endchoice <<
2931 <<
2932 config PCI_BIOS <<
2933 def_bool y <<
2934 depends on X86_32 && PCI && (PCI_GOBI <<
2935 <<
2936 # x86-64 doesn't support PCI BIOS access from <<
2937 config PCI_DIRECT <<
2938 def_bool y <<
2939 depends on PCI && (X86_64 || (PCI_GOD <<
2940 <<
2941 config PCI_MMCONFIG <<
2942 bool "Support mmconfig PCI config spa <<
2943 default y 474 default y
2944 depends on PCI && (ACPI || JAILHOUSE_ <<
2945 depends on X86_64 || (PCI_GOANY || PC <<
2946 <<
2947 config PCI_OLPC <<
2948 def_bool y <<
2949 depends on PCI && OLPC && (PCI_GOOLPC <<
2950 <<
2951 config PCI_XEN <<
2952 def_bool y <<
2953 depends on PCI && XEN <<
2954 <<
2955 config MMCONF_FAM10H <<
2956 def_bool y <<
2957 depends on X86_64 && PCI_MMCONFIG && <<
2958 <<
2959 config PCI_CNB20LE_QUIRK <<
2960 bool "Read CNB20LE Host Bridge Window <<
2961 depends on PCI <<
2962 help 475 help
2963 Read the PCI windows out of the CNB !! 476 Support VGA on an arbitrary hose; needed for several platforms
2964 PCI hotplug to work on systems with !! 477 which always have multiple hoses, and whose consoles support it.
2965 not have ACPI. <<
2966 478
2967 There's no public spec for this chi <<
2968 is known to be incomplete. <<
2969 479
2970 You should say N unless you know yo !! 480 config ALPHA_QEMU
>> 481 bool "Run under QEMU emulation"
>> 482 depends on !ALPHA_GENERIC
>> 483 ---help---
>> 484 Assume the presence of special features supported by QEMU PALcode
>> 485 that reduce the overhead of system emulation.
2971 486
2972 config ISA_BUS !! 487 Generic kernels will auto-detect QEMU. But when building a
2973 bool "ISA bus support on modern syste !! 488 system-specific kernel, the assumption is that we want to
2974 help !! 489 eliminate as many runtime tests as possible.
2975 Expose ISA bus device drivers and o <<
2976 configuration. Enable this option i <<
2977 bus. ISA is an older system, displa <<
2978 architectures -- if your target mac <<
2979 not have an ISA bus. <<
2980 490
2981 If unsure, say N. 491 If unsure, say N.
2982 492
2983 # x86_64 have no ISA slots, but can have ISA- <<
2984 config ISA_DMA_API <<
2985 bool "ISA-style DMA support" if (X86_ <<
2986 default y <<
2987 help <<
2988 Enables ISA-style DMA support for d <<
2989 If unsure, say Y. <<
2990 <<
2991 if X86_32 <<
2992 <<
2993 config ISA <<
2994 bool "ISA support" <<
2995 help <<
2996 Find out whether you have ISA slots <<
2997 name of a bus system, i.e. the way <<
2998 inside your box. Other bus systems <<
2999 (MCA) or VESA. ISA is an older sys <<
3000 newer boards don't support it. If <<
3001 <<
3002 config SCx200 <<
3003 tristate "NatSemi SCx200 support" <<
3004 help <<
3005 This provides basic support for Nat <<
3006 (now AMD's) Geode processors. The <<
3007 PCI-IDs of several on-chip devices, <<
3008 for other scx200_* drivers. <<
3009 <<
3010 If compiled as a module, the driver <<
3011 493
3012 config SCx200HR_TIMER !! 494 config ALPHA_SRM
3013 tristate "NatSemi SCx200 27MHz High-R !! 495 bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
3014 depends on SCx200 !! 496 depends on TTY
3015 default y !! 497 default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
3016 help !! 498 ---help---
3017 This driver provides a clocksource !! 499 There are two different types of booting firmware on Alphas: SRM,
3018 27MHz high-resolution timer. Its a !! 500 which is command line driven, and ARC, which uses menus and arrow
3019 NSC Geode SC-1100's buggy TSC, whic !! 501 keys. Details about the Linux/Alpha booting process are contained in
3020 processor goes idle (as is done by !! 502 the Linux/Alpha FAQ, accessible on the WWW from
3021 other workaround is idle=poll boot !! 503 <http://www.alphalinux.org/>.
>> 504
>> 505 The usual way to load Linux on an Alpha machine is to use MILO
>> 506 (a bootloader that lets you pass command line parameters to the
>> 507 kernel just like lilo does for the x86 architecture) which can be
>> 508 loaded either from ARC or can be installed directly as a permanent
>> 509 firmware replacement from floppy (which requires changing a certain
>> 510 jumper on the motherboard). If you want to do either of these, say N
>> 511 here. If MILO doesn't work on your system (true for Jensen
>> 512 motherboards), you can bypass it altogether and boot Linux directly
>> 513 from an SRM console; say Y here in order to do that. Note that you
>> 514 won't be able to boot from an IDE disk using SRM.
3022 515
3023 config OLPC !! 516 If unsure, say N.
3024 bool "One Laptop Per Child support" <<
3025 depends on !X86_PAE <<
3026 select GPIOLIB <<
3027 select OF <<
3028 select OF_PROMTREE <<
3029 select IRQ_DOMAIN <<
3030 select OLPC_EC <<
3031 help <<
3032 Add support for detecting the uniqu <<
3033 XO hardware. <<
3034 517
3035 config OLPC_XO1_PM !! 518 config ARCH_MAY_HAVE_PC_FDC
3036 bool "OLPC XO-1 Power Management" !! 519 def_bool y
3037 depends on OLPC && MFD_CS5535=y && PM <<
3038 help <<
3039 Add support for poweroff and suspen <<
3040 520
3041 config OLPC_XO1_RTC !! 521 config SMP
3042 bool "OLPC XO-1 Real Time Clock" !! 522 bool "Symmetric multi-processing support"
3043 depends on OLPC_XO1_PM && RTC_DRV_CMO !! 523 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
3044 help !! 524 ---help---
3045 Add support for the XO-1 real time !! 525 This enables support for systems with more than one CPU. If you have
3046 programmable wakeup source. !! 526 a system with only one CPU, say N. If you have a system with more
>> 527 than one CPU, say Y.
3047 528
3048 config OLPC_XO1_SCI !! 529 If you say N here, the kernel will run on uni- and multiprocessor
3049 bool "OLPC XO-1 SCI extras" !! 530 machines, but will use only one CPU of a multiprocessor machine. If
3050 depends on OLPC && OLPC_XO1_PM && GPI !! 531 you say Y here, the kernel will run on many, but not all,
3051 depends on INPUT=y !! 532 uniprocessor machines. On a uniprocessor machine, the kernel
3052 select POWER_SUPPLY !! 533 will run faster if you say N here.
3053 help <<
3054 Add support for SCI-based features <<
3055 - EC-driven system wakeups <<
3056 - Power button <<
3057 - Ebook switch <<
3058 - Lid switch <<
3059 - AC adapter status updates <<
3060 - Battery status updates <<
3061 534
3062 config OLPC_XO15_SCI !! 535 See also the SMP-HOWTO available at
3063 bool "OLPC XO-1.5 SCI extras" !! 536 <http://www.tldp.org/docs.html#howto>.
3064 depends on OLPC && ACPI <<
3065 select POWER_SUPPLY <<
3066 help <<
3067 Add support for SCI-based features <<
3068 - EC-driven system wakeups <<
3069 - AC adapter status updates <<
3070 - Battery status updates <<
3071 537
3072 config GEODE_COMMON !! 538 If you don't know what to do here, say N.
3073 bool <<
3074 539
3075 config ALIX !! 540 config NR_CPUS
3076 bool "PCEngines ALIX System Support ( !! 541 int "Maximum number of CPUs (2-32)"
3077 select GPIOLIB !! 542 range 2 32
3078 select GEODE_COMMON !! 543 depends on SMP
>> 544 default "32" if ALPHA_GENERIC || ALPHA_MARVEL
>> 545 default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL
3079 help 546 help
3080 This option enables system support !! 547 MARVEL support can handle a maximum of 32 CPUs, all the others
3081 At present this just sets up LEDs f !! 548 with working support have a maximum of 4 CPUs.
3082 ALIX2/3/6 boards. However, other s <<
3083 get added here. <<
3084 549
3085 Note: You must still enable the dri !! 550 config ARCH_DISCONTIGMEM_ENABLE
3086 (GPIO_CS5535 & LEDS_GPIO) to actual !! 551 bool "Discontiguous Memory Support"
3087 <<
3088 Note: You have to set alix.force=1 <<
3089 <<
3090 config NET5501 <<
3091 bool "Soekris Engineering net5501 Sys <<
3092 select GPIOLIB <<
3093 select GEODE_COMMON <<
3094 help 552 help
3095 This option enables system support !! 553 Say Y to support efficient handling of discontiguous physical memory,
>> 554 for architectures which are either NUMA (Non-Uniform Memory Access)
>> 555 or have huge holes in the physical address space for other reasons.
>> 556 See <file:Documentation/vm/numa.rst> for more.
3096 557
3097 config GEOS !! 558 config NUMA
3098 bool "Traverse Technologies GEOS Syst !! 559 bool "NUMA Support (EXPERIMENTAL)"
3099 select GPIOLIB !! 560 depends on DISCONTIGMEM && BROKEN
3100 select GEODE_COMMON <<
3101 depends on DMI <<
3102 help 561 help
3103 This option enables system support !! 562 Say Y to compile the kernel to support NUMA (Non-Uniform Memory
>> 563 Access). This option is for configuring high-end multiprocessor
>> 564 server machines. If in doubt, say N.
>> 565
>> 566 config ALPHA_WTINT
>> 567 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
>> 568 default y if ALPHA_QEMU
>> 569 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
>> 570 default n if !ALPHA_SRM && !ALPHA_GENERIC
>> 571 default y if SMP
>> 572 ---help---
>> 573 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
>> 574 to sleep until the next interrupt. This may reduce the power
>> 575 consumed, and the heat produced by the computer. However, it has
>> 576 the side effect of making the cycle counter unreliable as a timing
>> 577 device across the sleep.
3104 578
3105 config TS5500 !! 579 For emulation under QEMU, definitely say Y here, as we have other
3106 bool "Technologic Systems TS-5500 pla !! 580 mechanisms for measuring time than the cycle counter.
3107 depends on MELAN <<
3108 select CHECK_SIGNATURE <<
3109 select NEW_LEDS <<
3110 select LEDS_CLASS <<
3111 help <<
3112 This option enables system support <<
3113 581
3114 endif # X86_32 !! 582 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
>> 583 MILO, sleep mode is not supported so you might as well say N here.
3115 584
3116 config AMD_NB !! 585 For SMP systems we cannot use the cycle counter for timing anyway,
3117 def_bool y !! 586 so you might as well say Y here.
3118 depends on CPU_SUP_AMD && PCI <<
3119 587
3120 endmenu !! 588 If unsure, say N.
3121 589
3122 menu "Binary Emulations" !! 590 config NODES_SHIFT
>> 591 int
>> 592 default "7"
>> 593 depends on NEED_MULTIPLE_NODES
3123 594
3124 config IA32_EMULATION !! 595 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
3125 bool "IA32 Emulation" !! 596 config ALPHA_LARGE_VMALLOC
3126 depends on X86_64 !! 597 bool
3127 select ARCH_WANT_OLD_COMPAT_IPC !! 598 ---help---
3128 select BINFMT_ELF !! 599 Process creation and other aspects of virtual memory management can
3129 select COMPAT_OLD_SIGACTION !! 600 be streamlined if we restrict the kernel to one PGD for all vmalloc
3130 help !! 601 allocations. This equates to about 8GB.
3131 Include code to run legacy 32-bit p !! 602
3132 64-bit kernel. You should likely tu !! 603 Under normal circumstances, this is so far and above what is needed
3133 100% sure that you don't have any 3 !! 604 as to be laughable. However, there are certain applications (such
>> 605 as benchmark-grade in-kernel web serving) that can make use of as
>> 606 much vmalloc space as is available.
>> 607
>> 608 Say N unless you know you need gobs and gobs of vmalloc space.
>> 609
>> 610 config VERBOSE_MCHECK
>> 611 bool "Verbose Machine Checks"
>> 612
>> 613 config VERBOSE_MCHECK_ON
>> 614 int "Verbose Printing Mode (0=off, 1=on, 2=all)"
>> 615 depends on VERBOSE_MCHECK
>> 616 default 1
>> 617 ---help---
>> 618 This option allows the default printing mode to be set, and then
>> 619 possibly overridden by a boot command argument.
>> 620
>> 621 For example, if one wanted the option of printing verbose
>> 622 machine checks, but wanted the default to be as if verbose
>> 623 machine check printing was turned off, then one would choose
>> 624 the printing mode to be 0. Then, upon reboot, one could add
>> 625 the boot command line "verbose_mcheck=1" to get the normal
>> 626 verbose machine check printing, or "verbose_mcheck=2" to get
>> 627 the maximum information available.
3134 628
3135 config IA32_EMULATION_DEFAULT_DISABLED !! 629 Take the default (1) unless you want more control or more info.
3136 bool "IA32 emulation disabled by defa <<
3137 default n <<
3138 depends on IA32_EMULATION <<
3139 help <<
3140 Make IA32 emulation disabled by def <<
3141 processes and access to 32-bit sysc <<
3142 default value. <<
3143 <<
3144 config X86_X32_ABI <<
3145 bool "x32 ABI for 64-bit mode" <<
3146 depends on X86_64 <<
3147 # llvm-objcopy does not convert x86_6 <<
3148 # compressed debug sections to x86_x3 <<
3149 # https://github.com/ClangBuiltLinux/ <<
3150 # https://github.com/ClangBuiltLinux/ <<
3151 depends on $(success,$(OBJCOPY) --ver <<
3152 help <<
3153 Include code to run binaries for th <<
3154 for 64-bit processors. An x32 proc <<
3155 full 64-bit register file and wide <<
3156 pointers at 32 bits for smaller mem <<
3157 630
3158 config COMPAT_32 !! 631 choice
3159 def_bool y !! 632 prompt "Timer interrupt frequency (HZ)?"
3160 depends on IA32_EMULATION || X86_32 !! 633 default HZ_128 if ALPHA_QEMU
3161 select HAVE_UID16 !! 634 default HZ_1200 if ALPHA_RAWHIDE
3162 select OLD_SIGSUSPEND3 !! 635 default HZ_1024
>> 636 ---help---
>> 637 The frequency at which timer interrupts occur. A high frequency
>> 638 minimizes latency, whereas a low frequency minimizes overhead of
>> 639 process accounting. The later effect is especially significant
>> 640 when being run under QEMU.
>> 641
>> 642 Note that some Alpha hardware cannot change the interrupt frequency
>> 643 of the timer. If unsure, say 1024 (or 1200 for Rawhide).
>> 644
>> 645 config HZ_32
>> 646 bool "32 Hz"
>> 647 config HZ_64
>> 648 bool "64 Hz"
>> 649 config HZ_128
>> 650 bool "128 Hz"
>> 651 config HZ_256
>> 652 bool "256 Hz"
>> 653 config HZ_1024
>> 654 bool "1024 Hz"
>> 655 config HZ_1200
>> 656 bool "1200 Hz"
>> 657 endchoice
3163 658
3164 config COMPAT !! 659 config HZ
3165 def_bool y !! 660 int
3166 depends on IA32_EMULATION || X86_X32_ !! 661 default 32 if HZ_32
>> 662 default 64 if HZ_64
>> 663 default 128 if HZ_128
>> 664 default 256 if HZ_256
>> 665 default 1200 if HZ_1200
>> 666 default 1024
>> 667
>> 668 config SRM_ENV
>> 669 tristate "SRM environment through procfs"
>> 670 depends on PROC_FS
>> 671 ---help---
>> 672 If you enable this option, a subdirectory inside /proc called
>> 673 /proc/srm_environment will give you access to the all important
>> 674 SRM environment variables (those which have a name) and also
>> 675 to all others (by their internal number).
>> 676
>> 677 SRM is something like a BIOS for Alpha machines. There are some
>> 678 other such BIOSes, like AlphaBIOS, which this driver cannot
>> 679 support (hey, that's not SRM!).
>> 680
>> 681 Despite the fact that this driver doesn't work on all Alphas (but
>> 682 only on those which have SRM as their firmware), it's save to
>> 683 build it even if your particular machine doesn't know about SRM
>> 684 (or if you intend to compile a generic kernel). It will simply
>> 685 not create those subdirectory in /proc (and give you some warning,
>> 686 of course).
3167 687
3168 config COMPAT_FOR_U64_ALIGNMENT !! 688 This driver is also available as a module and will be called
3169 def_bool y !! 689 srm_env then.
3170 depends on COMPAT <<
3171 690
3172 endmenu 691 endmenu
3173 692
3174 config HAVE_ATOMIC_IOMAP !! 693 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
3175 def_bool y !! 694 # but we also need it if VGA_HOSE is set
3176 depends on X86_32 !! 695 config DUMMY_CONSOLE
3177 !! 696 bool
3178 source "arch/x86/kvm/Kconfig" !! 697 depends on VGA_HOSE
3179 !! 698 default y
3180 source "arch/x86/Kconfig.assembler" <<
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