Commit | Line | Data |
---|---|---|
8c2c3df3 CM |
1 | config ARM64 |
2 | def_bool y | |
b6197b93 | 3 | select ACPI_CCA_REQUIRED if ACPI |
d8f4f161 | 4 | select ACPI_GENERIC_GSI if ACPI |
6933de0c | 5 | select ACPI_REDUCED_HARDWARE_ONLY if ACPI |
8c2c3df3 | 6 | select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE |
2b68f6ca | 7 | select ARCH_HAS_ELF_RANDOMIZE |
957e3fac | 8 | select ARCH_HAS_GCOV_PROFILE_ALL |
308c09f1 | 9 | select ARCH_HAS_SG_CHAIN |
1f85008e | 10 | select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST |
c63c8700 | 11 | select ARCH_USE_CMPXCHG_LOCKREF |
4badad35 | 12 | select ARCH_SUPPORTS_ATOMIC_RMW |
9170100e | 13 | select ARCH_WANT_OPTIONAL_GPIOLIB |
6212a512 | 14 | select ARCH_WANT_COMPAT_IPC_PARSE_VERSION |
b6f35981 | 15 | select ARCH_WANT_FRAME_POINTERS |
25c92a37 | 16 | select ARM_AMBA |
1aee5d7a | 17 | select ARM_ARCH_TIMER |
c4188edc | 18 | select ARM_GIC |
875cbf3e | 19 | select AUDIT_ARCH_COMPAT_GENERIC |
853a33ce | 20 | select ARM_GIC_V2M if PCI_MSI |
021f6537 | 21 | select ARM_GIC_V3 |
19812729 | 22 | select ARM_GIC_V3_ITS if PCI_MSI |
adace895 | 23 | select BUILDTIME_EXTABLE_SORT |
db2789b5 | 24 | select CLONE_BACKWARDS |
7ca2ef33 | 25 | select COMMON_CLK |
166936ba | 26 | select CPU_PM if (SUSPEND || CPU_IDLE) |
7bc13fd3 | 27 | select DCACHE_WORD_ACCESS |
ef37566c | 28 | select EDAC_SUPPORT |
d4932f9e | 29 | select GENERIC_ALLOCATOR |
8c2c3df3 | 30 | select GENERIC_CLOCKEVENTS |
1f85008e | 31 | select GENERIC_CLOCKEVENTS_BROADCAST if SMP |
3be1a5c4 | 32 | select GENERIC_CPU_AUTOPROBE |
bf4b558e | 33 | select GENERIC_EARLY_IOREMAP |
8c2c3df3 CM |
34 | select GENERIC_IRQ_PROBE |
35 | select GENERIC_IRQ_SHOW | |
6544e67b | 36 | select GENERIC_IRQ_SHOW_LEVEL |
cb61f676 | 37 | select GENERIC_PCI_IOMAP |
65cd4f6c | 38 | select GENERIC_SCHED_CLOCK |
8c2c3df3 | 39 | select GENERIC_SMP_IDLE_THREAD |
12a0ef7b WD |
40 | select GENERIC_STRNCPY_FROM_USER |
41 | select GENERIC_STRNLEN_USER | |
8c2c3df3 | 42 | select GENERIC_TIME_VSYSCALL |
a1ddc74a | 43 | select HANDLE_DOMAIN_IRQ |
8c2c3df3 | 44 | select HARDIRQS_SW_RESEND |
5284e1b4 | 45 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
875cbf3e | 46 | select HAVE_ARCH_AUDITSYSCALL |
8e7a4cef | 47 | select HAVE_ARCH_BITREVERSE |
9732cafd | 48 | select HAVE_ARCH_JUMP_LABEL |
9529247d | 49 | select HAVE_ARCH_KGDB |
a1ae65b2 | 50 | select HAVE_ARCH_SECCOMP_FILTER |
8c2c3df3 | 51 | select HAVE_ARCH_TRACEHOOK |
e54bcde3 | 52 | select HAVE_BPF_JIT |
af64d2aa | 53 | select HAVE_C_RECORDMCOUNT |
c0c264ae | 54 | select HAVE_CC_STACKPROTECTOR |
5284e1b4 | 55 | select HAVE_CMPXCHG_DOUBLE |
9b2a60c4 | 56 | select HAVE_DEBUG_BUGVERBOSE |
b69ec42b | 57 | select HAVE_DEBUG_KMEMLEAK |
8c2c3df3 CM |
58 | select HAVE_DMA_API_DEBUG |
59 | select HAVE_DMA_ATTRS | |
6ac2104d | 60 | select HAVE_DMA_CONTIGUOUS |
bd7d38db | 61 | select HAVE_DYNAMIC_FTRACE |
50afc33a | 62 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
af64d2aa | 63 | select HAVE_FTRACE_MCOUNT_RECORD |
819e50e2 AT |
64 | select HAVE_FUNCTION_TRACER |
65 | select HAVE_FUNCTION_GRAPH_TRACER | |
8c2c3df3 | 66 | select HAVE_GENERIC_DMA_COHERENT |
8c2c3df3 | 67 | select HAVE_HW_BREAKPOINT if PERF_EVENTS |
8c2c3df3 | 68 | select HAVE_MEMBLOCK |
55834a77 | 69 | select HAVE_PATA_PLATFORM |
8c2c3df3 | 70 | select HAVE_PERF_EVENTS |
2ee0d7fd JP |
71 | select HAVE_PERF_REGS |
72 | select HAVE_PERF_USER_STACK_DUMP | |
5e5f6dc1 | 73 | select HAVE_RCU_TABLE_FREE |
055b1212 | 74 | select HAVE_SYSCALL_TRACEPOINTS |
8c2c3df3 | 75 | select IRQ_DOMAIN |
e8557d1f | 76 | select IRQ_FORCED_THREADING |
fea2acaa | 77 | select MODULES_USE_ELF_RELA |
8c2c3df3 CM |
78 | select NO_BOOTMEM |
79 | select OF | |
80 | select OF_EARLY_FLATTREE | |
9bf14b7c | 81 | select OF_RESERVED_MEM |
8c2c3df3 | 82 | select PERF_USE_VMALLOC |
aa1e8ec1 CM |
83 | select POWER_RESET |
84 | select POWER_SUPPLY | |
8c2c3df3 CM |
85 | select RTC_LIB |
86 | select SPARSE_IRQ | |
7ac57a89 | 87 | select SYSCTL_EXCEPTION_TRACE |
6c81fe79 | 88 | select HAVE_CONTEXT_TRACKING |
8c2c3df3 CM |
89 | help |
90 | ARM 64-bit (AArch64) Linux support. | |
91 | ||
92 | config 64BIT | |
93 | def_bool y | |
94 | ||
95 | config ARCH_PHYS_ADDR_T_64BIT | |
96 | def_bool y | |
97 | ||
98 | config MMU | |
99 | def_bool y | |
100 | ||
ce816fa8 | 101 | config NO_IOPORT_MAP |
d1e6dc91 | 102 | def_bool y if !PCI |
8c2c3df3 CM |
103 | |
104 | config STACKTRACE_SUPPORT | |
105 | def_bool y | |
106 | ||
107 | config LOCKDEP_SUPPORT | |
108 | def_bool y | |
109 | ||
110 | config TRACE_IRQFLAGS_SUPPORT | |
111 | def_bool y | |
112 | ||
c209f799 | 113 | config RWSEM_XCHGADD_ALGORITHM |
8c2c3df3 CM |
114 | def_bool y |
115 | ||
116 | config GENERIC_HWEIGHT | |
117 | def_bool y | |
118 | ||
119 | config GENERIC_CSUM | |
120 | def_bool y | |
121 | ||
122 | config GENERIC_CALIBRATE_DELAY | |
123 | def_bool y | |
124 | ||
19e7640d | 125 | config ZONE_DMA |
8c2c3df3 CM |
126 | def_bool y |
127 | ||
29e56940 SC |
128 | config HAVE_GENERIC_RCU_GUP |
129 | def_bool y | |
130 | ||
8c2c3df3 CM |
131 | config ARCH_DMA_ADDR_T_64BIT |
132 | def_bool y | |
133 | ||
134 | config NEED_DMA_MAP_STATE | |
135 | def_bool y | |
136 | ||
137 | config NEED_SG_DMA_LENGTH | |
138 | def_bool y | |
139 | ||
140 | config SWIOTLB | |
141 | def_bool y | |
142 | ||
143 | config IOMMU_HELPER | |
144 | def_bool SWIOTLB | |
145 | ||
4cfb3613 AB |
146 | config KERNEL_MODE_NEON |
147 | def_bool y | |
148 | ||
92cc15fc RH |
149 | config FIX_EARLYCON_MEM |
150 | def_bool y | |
151 | ||
9f25e6ad KS |
152 | config PGTABLE_LEVELS |
153 | int | |
154 | default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 | |
155 | default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 | |
156 | default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 | |
157 | default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48 | |
158 | ||
8c2c3df3 CM |
159 | source "init/Kconfig" |
160 | ||
161 | source "kernel/Kconfig.freezer" | |
162 | ||
eed6b3eb | 163 | source "Kconfig.platforms" |
8c2c3df3 CM |
164 | |
165 | menu "Bus support" | |
166 | ||
d1e6dc91 LD |
167 | config PCI |
168 | bool "PCI support" | |
169 | help | |
170 | This feature enables support for PCI bus system. If you say Y | |
171 | here, the kernel will include drivers and infrastructure code | |
172 | to support PCI bus devices. | |
173 | ||
174 | config PCI_DOMAINS | |
175 | def_bool PCI | |
176 | ||
177 | config PCI_DOMAINS_GENERIC | |
178 | def_bool PCI | |
179 | ||
180 | config PCI_SYSCALL | |
181 | def_bool PCI | |
182 | ||
183 | source "drivers/pci/Kconfig" | |
184 | source "drivers/pci/pcie/Kconfig" | |
185 | source "drivers/pci/hotplug/Kconfig" | |
186 | ||
8c2c3df3 CM |
187 | endmenu |
188 | ||
189 | menu "Kernel Features" | |
190 | ||
c0a01b84 AP |
191 | menu "ARM errata workarounds via the alternatives framework" |
192 | ||
193 | config ARM64_ERRATUM_826319 | |
194 | bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted" | |
195 | default y | |
196 | help | |
197 | This option adds an alternative code sequence to work around ARM | |
198 | erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or | |
199 | AXI master interface and an L2 cache. | |
200 | ||
201 | If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors | |
202 | and is unable to accept a certain write via this interface, it will | |
203 | not progress on read data presented on the read data channel and the | |
204 | system can deadlock. | |
205 | ||
206 | The workaround promotes data cache clean instructions to | |
207 | data cache clean-and-invalidate. | |
208 | Please note that this does not necessarily enable the workaround, | |
209 | as it depends on the alternative framework, which will only patch | |
210 | the kernel if an affected CPU is detected. | |
211 | ||
212 | If unsure, say Y. | |
213 | ||
214 | config ARM64_ERRATUM_827319 | |
215 | bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect" | |
216 | default y | |
217 | help | |
218 | This option adds an alternative code sequence to work around ARM | |
219 | erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI | |
220 | master interface and an L2 cache. | |
221 | ||
222 | Under certain conditions this erratum can cause a clean line eviction | |
223 | to occur at the same time as another transaction to the same address | |
224 | on the AMBA 5 CHI interface, which can cause data corruption if the | |
225 | interconnect reorders the two transactions. | |
226 | ||
227 | The workaround promotes data cache clean instructions to | |
228 | data cache clean-and-invalidate. | |
229 | Please note that this does not necessarily enable the workaround, | |
230 | as it depends on the alternative framework, which will only patch | |
231 | the kernel if an affected CPU is detected. | |
232 | ||
233 | If unsure, say Y. | |
234 | ||
235 | config ARM64_ERRATUM_824069 | |
236 | bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop" | |
237 | default y | |
238 | help | |
239 | This option adds an alternative code sequence to work around ARM | |
240 | erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected | |
241 | to a coherent interconnect. | |
242 | ||
243 | If a Cortex-A53 processor is executing a store or prefetch for | |
244 | write instruction at the same time as a processor in another | |
245 | cluster is executing a cache maintenance operation to the same | |
246 | address, then this erratum might cause a clean cache line to be | |
247 | incorrectly marked as dirty. | |
248 | ||
249 | The workaround promotes data cache clean instructions to | |
250 | data cache clean-and-invalidate. | |
251 | Please note that this option does not necessarily enable the | |
252 | workaround, as it depends on the alternative framework, which will | |
253 | only patch the kernel if an affected CPU is detected. | |
254 | ||
255 | If unsure, say Y. | |
256 | ||
257 | config ARM64_ERRATUM_819472 | |
258 | bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption" | |
259 | default y | |
260 | help | |
261 | This option adds an alternative code sequence to work around ARM | |
262 | erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache | |
263 | present when it is connected to a coherent interconnect. | |
264 | ||
265 | If the processor is executing a load and store exclusive sequence at | |
266 | the same time as a processor in another cluster is executing a cache | |
267 | maintenance operation to the same address, then this erratum might | |
268 | cause data corruption. | |
269 | ||
270 | The workaround promotes data cache clean instructions to | |
271 | data cache clean-and-invalidate. | |
272 | Please note that this does not necessarily enable the workaround, | |
273 | as it depends on the alternative framework, which will only patch | |
274 | the kernel if an affected CPU is detected. | |
275 | ||
276 | If unsure, say Y. | |
277 | ||
278 | config ARM64_ERRATUM_832075 | |
279 | bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads" | |
280 | default y | |
281 | help | |
282 | This option adds an alternative code sequence to work around ARM | |
283 | erratum 832075 on Cortex-A57 parts up to r1p2. | |
284 | ||
285 | Affected Cortex-A57 parts might deadlock when exclusive load/store | |
286 | instructions to Write-Back memory are mixed with Device loads. | |
287 | ||
288 | The workaround is to promote device loads to use Load-Acquire | |
289 | semantics. | |
290 | Please note that this does not necessarily enable the workaround, | |
291 | as it depends on the alternative framework, which will only patch | |
292 | the kernel if an affected CPU is detected. | |
293 | ||
294 | If unsure, say Y. | |
295 | ||
905e8c5d WD |
296 | config ARM64_ERRATUM_845719 |
297 | bool "Cortex-A53: 845719: a load might read incorrect data" | |
298 | depends on COMPAT | |
299 | default y | |
300 | help | |
301 | This option adds an alternative code sequence to work around ARM | |
302 | erratum 845719 on Cortex-A53 parts up to r0p4. | |
303 | ||
304 | When running a compat (AArch32) userspace on an affected Cortex-A53 | |
305 | part, a load at EL0 from a virtual address that matches the bottom 32 | |
306 | bits of the virtual address used by a recent load at (AArch64) EL1 | |
307 | might return incorrect data. | |
308 | ||
309 | The workaround is to write the contextidr_el1 register on exception | |
310 | return to a 32-bit task. | |
311 | Please note that this does not necessarily enable the workaround, | |
312 | as it depends on the alternative framework, which will only patch | |
313 | the kernel if an affected CPU is detected. | |
314 | ||
315 | If unsure, say Y. | |
316 | ||
c0a01b84 AP |
317 | endmenu |
318 | ||
319 | ||
e41ceed0 JL |
320 | choice |
321 | prompt "Page size" | |
322 | default ARM64_4K_PAGES | |
323 | help | |
324 | Page size (translation granule) configuration. | |
325 | ||
326 | config ARM64_4K_PAGES | |
327 | bool "4KB" | |
328 | help | |
329 | This feature enables 4KB pages support. | |
330 | ||
8c2c3df3 | 331 | config ARM64_64K_PAGES |
e41ceed0 | 332 | bool "64KB" |
8c2c3df3 CM |
333 | help |
334 | This feature enables 64KB pages support (4KB by default) | |
335 | allowing only two levels of page tables and faster TLB | |
336 | look-up. AArch32 emulation is not available when this feature | |
337 | is enabled. | |
338 | ||
e41ceed0 JL |
339 | endchoice |
340 | ||
341 | choice | |
342 | prompt "Virtual address space size" | |
343 | default ARM64_VA_BITS_39 if ARM64_4K_PAGES | |
344 | default ARM64_VA_BITS_42 if ARM64_64K_PAGES | |
345 | help | |
346 | Allows choosing one of multiple possible virtual address | |
347 | space sizes. The level of translation table is determined by | |
348 | a combination of page size and virtual address space size. | |
349 | ||
350 | config ARM64_VA_BITS_39 | |
351 | bool "39-bit" | |
352 | depends on ARM64_4K_PAGES | |
353 | ||
354 | config ARM64_VA_BITS_42 | |
355 | bool "42-bit" | |
356 | depends on ARM64_64K_PAGES | |
357 | ||
c79b954b JL |
358 | config ARM64_VA_BITS_48 |
359 | bool "48-bit" | |
c79b954b | 360 | |
e41ceed0 JL |
361 | endchoice |
362 | ||
363 | config ARM64_VA_BITS | |
364 | int | |
365 | default 39 if ARM64_VA_BITS_39 | |
366 | default 42 if ARM64_VA_BITS_42 | |
c79b954b | 367 | default 48 if ARM64_VA_BITS_48 |
e41ceed0 | 368 | |
a872013d WD |
369 | config CPU_BIG_ENDIAN |
370 | bool "Build big-endian kernel" | |
371 | help | |
372 | Say Y if you plan on running a kernel in big-endian mode. | |
373 | ||
8c2c3df3 CM |
374 | config SMP |
375 | bool "Symmetric Multi-Processing" | |
8c2c3df3 CM |
376 | help |
377 | This enables support for systems with more than one CPU. If | |
378 | you say N here, the kernel will run on single and | |
379 | multiprocessor machines, but will use only one CPU of a | |
380 | multiprocessor machine. If you say Y here, the kernel will run | |
381 | on many, but not all, single processor machines. On a single | |
382 | processor machine, the kernel will run faster if you say N | |
383 | here. | |
384 | ||
385 | If you don't know what to do here, say N. | |
386 | ||
f6e763b9 MB |
387 | config SCHED_MC |
388 | bool "Multi-core scheduler support" | |
389 | depends on SMP | |
390 | help | |
391 | Multi-core scheduler support improves the CPU scheduler's decision | |
392 | making when dealing with multi-core CPU chips at a cost of slightly | |
393 | increased overhead in some places. If unsure say N here. | |
394 | ||
395 | config SCHED_SMT | |
396 | bool "SMT scheduler support" | |
397 | depends on SMP | |
398 | help | |
399 | Improves the CPU scheduler's decision making when dealing with | |
400 | MultiThreading at a cost of slightly increased overhead in some | |
401 | places. If unsure say N here. | |
402 | ||
8c2c3df3 | 403 | config NR_CPUS |
62aa9655 GK |
404 | int "Maximum number of CPUs (2-4096)" |
405 | range 2 4096 | |
8c2c3df3 | 406 | depends on SMP |
15942853 | 407 | # These have to remain sorted largest to smallest |
e3672649 | 408 | default "64" |
8c2c3df3 | 409 | |
9327e2c6 MR |
410 | config HOTPLUG_CPU |
411 | bool "Support for hot-pluggable CPUs" | |
412 | depends on SMP | |
413 | help | |
414 | Say Y here to experiment with turning CPUs off and on. CPUs | |
415 | can be controlled through /sys/devices/system/cpu. | |
416 | ||
8c2c3df3 CM |
417 | source kernel/Kconfig.preempt |
418 | ||
137650aa MR |
419 | config UP_LATE_INIT |
420 | def_bool y | |
421 | depends on !SMP | |
422 | ||
8c2c3df3 CM |
423 | config HZ |
424 | int | |
425 | default 100 | |
426 | ||
427 | config ARCH_HAS_HOLES_MEMORYMODEL | |
428 | def_bool y if SPARSEMEM | |
429 | ||
430 | config ARCH_SPARSEMEM_ENABLE | |
431 | def_bool y | |
432 | select SPARSEMEM_VMEMMAP_ENABLE | |
433 | ||
434 | config ARCH_SPARSEMEM_DEFAULT | |
435 | def_bool ARCH_SPARSEMEM_ENABLE | |
436 | ||
437 | config ARCH_SELECT_MEMORY_MODEL | |
438 | def_bool ARCH_SPARSEMEM_ENABLE | |
439 | ||
440 | config HAVE_ARCH_PFN_VALID | |
441 | def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM | |
442 | ||
443 | config HW_PERF_EVENTS | |
444 | bool "Enable hardware performance counter support for perf events" | |
445 | depends on PERF_EVENTS | |
446 | default y | |
447 | help | |
448 | Enable hardware performance counter support for perf events. If | |
449 | disabled, perf events will use software events only. | |
450 | ||
084bd298 SC |
451 | config SYS_SUPPORTS_HUGETLBFS |
452 | def_bool y | |
453 | ||
454 | config ARCH_WANT_GENERAL_HUGETLB | |
455 | def_bool y | |
456 | ||
457 | config ARCH_WANT_HUGE_PMD_SHARE | |
458 | def_bool y if !ARM64_64K_PAGES | |
459 | ||
af074848 SC |
460 | config HAVE_ARCH_TRANSPARENT_HUGEPAGE |
461 | def_bool y | |
462 | ||
a41dc0e8 CM |
463 | config ARCH_HAS_CACHE_LINE_SIZE |
464 | def_bool y | |
465 | ||
8c2c3df3 CM |
466 | source "mm/Kconfig" |
467 | ||
a1ae65b2 AT |
468 | config SECCOMP |
469 | bool "Enable seccomp to safely compute untrusted bytecode" | |
470 | ---help--- | |
471 | This kernel feature is useful for number crunching applications | |
472 | that may need to compute untrusted bytecode during their | |
473 | execution. By using pipes or other transports made available to | |
474 | the process as file descriptors supporting the read/write | |
475 | syscalls, it's possible to isolate those applications in | |
476 | their own address space using seccomp. Once seccomp is | |
477 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled | |
478 | and the task is only allowed to execute a few safe syscalls | |
479 | defined by each seccomp mode. | |
480 | ||
aa42aa13 SS |
481 | config XEN_DOM0 |
482 | def_bool y | |
483 | depends on XEN | |
484 | ||
485 | config XEN | |
c2ba1f7d | 486 | bool "Xen guest support on ARM64" |
aa42aa13 | 487 | depends on ARM64 && OF |
83862ccf | 488 | select SWIOTLB_XEN |
aa42aa13 SS |
489 | help |
490 | Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. | |
491 | ||
d03bb145 SC |
492 | config FORCE_MAX_ZONEORDER |
493 | int | |
494 | default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) | |
495 | default "11" | |
496 | ||
1b907f46 WD |
497 | menuconfig ARMV8_DEPRECATED |
498 | bool "Emulate deprecated/obsolete ARMv8 instructions" | |
499 | depends on COMPAT | |
500 | help | |
501 | Legacy software support may require certain instructions | |
502 | that have been deprecated or obsoleted in the architecture. | |
503 | ||
504 | Enable this config to enable selective emulation of these | |
505 | features. | |
506 | ||
507 | If unsure, say Y | |
508 | ||
509 | if ARMV8_DEPRECATED | |
510 | ||
511 | config SWP_EMULATION | |
512 | bool "Emulate SWP/SWPB instructions" | |
513 | help | |
514 | ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that | |
515 | they are always undefined. Say Y here to enable software | |
516 | emulation of these instructions for userspace using LDXR/STXR. | |
517 | ||
518 | In some older versions of glibc [<=2.8] SWP is used during futex | |
519 | trylock() operations with the assumption that the code will not | |
520 | be preempted. This invalid assumption may be more likely to fail | |
521 | with SWP emulation enabled, leading to deadlock of the user | |
522 | application. | |
523 | ||
524 | NOTE: when accessing uncached shared regions, LDXR/STXR rely | |
525 | on an external transaction monitoring block called a global | |
526 | monitor to maintain update atomicity. If your system does not | |
527 | implement a global monitor, this option can cause programs that | |
528 | perform SWP operations to uncached memory to deadlock. | |
529 | ||
530 | If unsure, say Y | |
531 | ||
532 | config CP15_BARRIER_EMULATION | |
533 | bool "Emulate CP15 Barrier instructions" | |
534 | help | |
535 | The CP15 barrier instructions - CP15ISB, CP15DSB, and | |
536 | CP15DMB - are deprecated in ARMv8 (and ARMv7). It is | |
537 | strongly recommended to use the ISB, DSB, and DMB | |
538 | instructions instead. | |
539 | ||
540 | Say Y here to enable software emulation of these | |
541 | instructions for AArch32 userspace code. When this option is | |
542 | enabled, CP15 barrier usage is traced which can help | |
543 | identify software that needs updating. | |
544 | ||
545 | If unsure, say Y | |
546 | ||
2d888f48 SP |
547 | config SETEND_EMULATION |
548 | bool "Emulate SETEND instruction" | |
549 | help | |
550 | The SETEND instruction alters the data-endianness of the | |
551 | AArch32 EL0, and is deprecated in ARMv8. | |
552 | ||
553 | Say Y here to enable software emulation of the instruction | |
554 | for AArch32 userspace code. | |
555 | ||
556 | Note: All the cpus on the system must have mixed endian support at EL0 | |
557 | for this feature to be enabled. If a new CPU - which doesn't support mixed | |
558 | endian - is hotplugged in after this feature has been enabled, there could | |
559 | be unexpected results in the applications. | |
560 | ||
561 | If unsure, say Y | |
1b907f46 WD |
562 | endif |
563 | ||
8c2c3df3 CM |
564 | endmenu |
565 | ||
566 | menu "Boot options" | |
567 | ||
568 | config CMDLINE | |
569 | string "Default kernel command string" | |
570 | default "" | |
571 | help | |
572 | Provide a set of default command-line options at build time by | |
573 | entering them here. As a minimum, you should specify the the | |
574 | root device (e.g. root=/dev/nfs). | |
575 | ||
576 | config CMDLINE_FORCE | |
577 | bool "Always use the default kernel command string" | |
578 | help | |
579 | Always use the default kernel command string, even if the boot | |
580 | loader passes other arguments to the kernel. | |
581 | This is useful if you cannot or don't want to change the | |
582 | command-line options your boot loader passes to the kernel. | |
583 | ||
f4f75ad5 AB |
584 | config EFI_STUB |
585 | bool | |
586 | ||
f84d0275 MS |
587 | config EFI |
588 | bool "UEFI runtime support" | |
589 | depends on OF && !CPU_BIG_ENDIAN | |
590 | select LIBFDT | |
591 | select UCS2_STRING | |
592 | select EFI_PARAMS_FROM_FDT | |
e15dd494 | 593 | select EFI_RUNTIME_WRAPPERS |
f4f75ad5 AB |
594 | select EFI_STUB |
595 | select EFI_ARMSTUB | |
f84d0275 MS |
596 | default y |
597 | help | |
598 | This option provides support for runtime services provided | |
599 | by UEFI firmware (such as non-volatile variables, realtime | |
3c7f2550 MS |
600 | clock, and platform reset). A UEFI stub is also provided to |
601 | allow the kernel to be booted as an EFI application. This | |
602 | is only useful on systems that have UEFI firmware. | |
f84d0275 | 603 | |
d1ae8c00 YL |
604 | config DMI |
605 | bool "Enable support for SMBIOS (DMI) tables" | |
606 | depends on EFI | |
607 | default y | |
608 | help | |
609 | This enables SMBIOS/DMI feature for systems. | |
610 | ||
611 | This option is only useful on systems that have UEFI firmware. | |
612 | However, even with this option, the resultant kernel should | |
613 | continue to boot on existing non-UEFI platforms. | |
614 | ||
8c2c3df3 CM |
615 | endmenu |
616 | ||
617 | menu "Userspace binary formats" | |
618 | ||
619 | source "fs/Kconfig.binfmt" | |
620 | ||
621 | config COMPAT | |
622 | bool "Kernel support for 32-bit EL0" | |
a8fcd8b1 | 623 | depends on !ARM64_64K_PAGES || EXPERT |
8c2c3df3 | 624 | select COMPAT_BINFMT_ELF |
af1839eb | 625 | select HAVE_UID16 |
84b9e9b4 | 626 | select OLD_SIGSUSPEND3 |
51682036 | 627 | select COMPAT_OLD_SIGACTION |
8c2c3df3 CM |
628 | help |
629 | This option enables support for a 32-bit EL0 running under a 64-bit | |
630 | kernel at EL1. AArch32-specific components such as system calls, | |
631 | the user helper functions, VFP support and the ptrace interface are | |
632 | handled appropriately by the kernel. | |
633 | ||
a8fcd8b1 AG |
634 | If you also enabled CONFIG_ARM64_64K_PAGES, please be aware that you |
635 | will only be able to execute AArch32 binaries that were compiled with | |
636 | 64k aligned segments. | |
637 | ||
8c2c3df3 CM |
638 | If you want to execute 32-bit userspace applications, say Y. |
639 | ||
640 | config SYSVIPC_COMPAT | |
641 | def_bool y | |
642 | depends on COMPAT && SYSVIPC | |
643 | ||
644 | endmenu | |
645 | ||
166936ba LP |
646 | menu "Power management options" |
647 | ||
648 | source "kernel/power/Kconfig" | |
649 | ||
650 | config ARCH_SUSPEND_POSSIBLE | |
651 | def_bool y | |
652 | ||
166936ba LP |
653 | endmenu |
654 | ||
1307220d LP |
655 | menu "CPU Power Management" |
656 | ||
657 | source "drivers/cpuidle/Kconfig" | |
658 | ||
52e7e816 RH |
659 | source "drivers/cpufreq/Kconfig" |
660 | ||
661 | endmenu | |
662 | ||
8c2c3df3 CM |
663 | source "net/Kconfig" |
664 | ||
665 | source "drivers/Kconfig" | |
666 | ||
f84d0275 MS |
667 | source "drivers/firmware/Kconfig" |
668 | ||
b6a02173 GG |
669 | source "drivers/acpi/Kconfig" |
670 | ||
8c2c3df3 CM |
671 | source "fs/Kconfig" |
672 | ||
c3eb5b14 MZ |
673 | source "arch/arm64/kvm/Kconfig" |
674 | ||
8c2c3df3 CM |
675 | source "arch/arm64/Kconfig.debug" |
676 | ||
677 | source "security/Kconfig" | |
678 | ||
679 | source "crypto/Kconfig" | |
2c98833a AB |
680 | if CRYPTO |
681 | source "arch/arm64/crypto/Kconfig" | |
682 | endif | |
8c2c3df3 CM |
683 | |
684 | source "lib/Kconfig" |