blob: 40e1151fb7715101744740078048d3a4f305f8bd [file] [log] [blame]
Catalin Marinas8c2c3df2012-04-20 14:45:54 +01001config ARM64
2 def_bool y
Suthikulpanit, Suraveeb6197b92015-06-10 11:08:53 -05003 select ACPI_CCA_REQUIRED if ACPI
Lorenzo Pieralisid8f4f162015-03-24 17:58:51 +00004 select ACPI_GENERIC_GSI if ACPI
Al Stone6933de02015-03-24 14:02:51 +00005 select ACPI_REDUCED_HARDWARE_ONLY if ACPI
Catalin Marinas8c2c3df2012-04-20 14:45:54 +01006 select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
Kees Cook2b68f6c2015-04-14 15:48:00 -07007 select ARCH_HAS_ELF_RANDOMIZE
Riku Voipio957e3fa2014-12-12 16:57:44 -08008 select ARCH_HAS_GCOV_PROFILE_ALL
Laura Abbott308c09f2014-08-08 14:23:25 -07009 select ARCH_HAS_SG_CHAIN
Lorenzo Pieralisi1f850082013-09-04 10:55:17 +010010 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
Sudeep Hollac63c8702014-05-09 10:33:01 +010011 select ARCH_USE_CMPXCHG_LOCKREF
Peter Zijlstra4badad32014-06-06 19:53:16 +020012 select ARCH_SUPPORTS_ATOMIC_RMW
Arnd Bergmann91701002013-02-21 11:42:57 +010013 select ARCH_WANT_OPTIONAL_GPIOLIB
Will Deacon6212a512012-11-07 14:16:28 +000014 select ARCH_WANT_COMPAT_IPC_PARSE_VERSION
Catalin Marinasb6f35982013-01-29 18:25:41 +000015 select ARCH_WANT_FRAME_POINTERS
Catalin Marinas25c92a32012-12-18 15:26:13 +000016 select ARM_AMBA
Mark Rutland1aee5d72012-11-20 10:06:00 +000017 select ARM_ARCH_TIMER
Catalin Marinasc4188ed2013-01-14 12:39:31 +000018 select ARM_GIC
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010019 select AUDIT_ARCH_COMPAT_GENERIC
Suravee Suthikulpanit853a33c2014-11-25 18:47:22 +000020 select ARM_GIC_V2M if PCI_MSI
Marc Zyngier021f6532014-06-30 16:01:31 +010021 select ARM_GIC_V3
Marc Zyngier19812722014-11-24 14:35:19 +000022 select ARM_GIC_V3_ITS if PCI_MSI
Mark Rutlandbff60792015-07-31 15:46:16 +010023 select ARM_PSCI_FW
Will Deaconadace892013-05-08 17:29:24 +010024 select BUILDTIME_EXTABLE_SORT
Catalin Marinasdb2789b2012-12-18 15:27:25 +000025 select CLONE_BACKWARDS
Deepak Saxena7ca2ef32012-09-22 10:33:36 -070026 select COMMON_CLK
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +000027 select CPU_PM if (SUSPEND || CPU_IDLE)
Will Deacon7bc13fd2013-11-06 19:32:13 +000028 select DCACHE_WORD_ACCESS
Catalin Marinasef375662015-07-07 17:15:39 +010029 select EDAC_SUPPORT
Yang Shi2f34f172015-11-09 10:09:55 -080030 select FRAME_POINTER
Laura Abbottd4932f92014-10-09 15:26:44 -070031 select GENERIC_ALLOCATOR
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010032 select GENERIC_CLOCKEVENTS
Will Deacon4b3dc962015-05-29 18:28:44 +010033 select GENERIC_CLOCKEVENTS_BROADCAST
Ard Biesheuvel3be1a5c2014-03-04 01:10:04 +000034 select GENERIC_CPU_AUTOPROBE
Mark Salterbf4b5582014-04-07 15:39:52 -070035 select GENERIC_EARLY_IOREMAP
Leo Yan2314ee42015-08-21 04:40:22 +010036 select GENERIC_IDLE_POLL_SETUP
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010037 select GENERIC_IRQ_PROBE
38 select GENERIC_IRQ_SHOW
Sudeep Holla6544e672015-04-22 18:16:33 +010039 select GENERIC_IRQ_SHOW_LEVEL
Arnd Bergmanncb61f672014-11-19 14:09:07 +010040 select GENERIC_PCI_IOMAP
Stephen Boyd65cd4f62013-07-18 16:21:18 -070041 select GENERIC_SCHED_CLOCK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010042 select GENERIC_SMP_IDLE_THREAD
Will Deacon12a0ef72013-11-06 17:20:22 +000043 select GENERIC_STRNCPY_FROM_USER
44 select GENERIC_STRNLEN_USER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010045 select GENERIC_TIME_VSYSCALL
Marc Zyngiera1ddc742014-08-26 11:03:17 +010046 select HANDLE_DOMAIN_IRQ
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010047 select HARDIRQS_SW_RESEND
Steve Capper5284e1b2014-10-24 13:22:20 +010048 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010049 select HAVE_ARCH_AUDITSYSCALL
Yalin Wang8e7a4ce2014-11-03 03:02:23 +010050 select HAVE_ARCH_BITREVERSE
Jiang Liu9732caf2014-01-07 22:17:13 +080051 select HAVE_ARCH_JUMP_LABEL
Andrey Ryabinin39d114d2015-10-12 18:52:58 +030052 select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP
Vijaya Kumar K95292472014-01-28 11:20:22 +000053 select HAVE_ARCH_KGDB
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +000054 select HAVE_ARCH_SECCOMP_FILTER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010055 select HAVE_ARCH_TRACEHOOK
Zi Shen Lime54bcde2014-08-26 21:15:30 -070056 select HAVE_BPF_JIT
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010057 select HAVE_C_RECORDMCOUNT
Laura Abbottc0c264a2014-06-25 23:55:03 +010058 select HAVE_CC_STACKPROTECTOR
Steve Capper5284e1b2014-10-24 13:22:20 +010059 select HAVE_CMPXCHG_DOUBLE
Will Deacon95eff6b2015-05-29 14:57:47 +010060 select HAVE_CMPXCHG_LOCAL
Catalin Marinas9b2a60c2012-10-08 16:28:13 -070061 select HAVE_DEBUG_BUGVERBOSE
Catalin Marinasb69ec422012-10-08 16:28:11 -070062 select HAVE_DEBUG_KMEMLEAK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010063 select HAVE_DMA_API_DEBUG
64 select HAVE_DMA_ATTRS
Laura Abbott6ac21042013-12-12 19:28:33 +000065 select HAVE_DMA_CONTIGUOUS
AKASHI Takahirobd7d38d2014-04-30 10:54:34 +010066 select HAVE_DYNAMIC_FTRACE
Will Deacon50afc332013-12-16 17:50:08 +000067 select HAVE_EFFICIENT_UNALIGNED_ACCESS
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010068 select HAVE_FTRACE_MCOUNT_RECORD
AKASHI Takahiro819e50e2014-04-30 18:54:33 +090069 select HAVE_FUNCTION_TRACER
70 select HAVE_FUNCTION_GRAPH_TRACER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010071 select HAVE_GENERIC_DMA_COHERENT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010072 select HAVE_HW_BREAKPOINT if PERF_EVENTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010073 select HAVE_MEMBLOCK
Mark Rutland55834a72014-02-07 17:12:45 +000074 select HAVE_PATA_PLATFORM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010075 select HAVE_PERF_EVENTS
Jean Pihet2ee0d7f2014-02-03 19:18:27 +010076 select HAVE_PERF_REGS
77 select HAVE_PERF_USER_STACK_DUMP
Steve Capper5e5f6dc2014-10-09 15:29:23 -070078 select HAVE_RCU_TABLE_FREE
AKASHI Takahiro055b1212014-04-30 10:54:36 +010079 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010080 select IRQ_DOMAIN
Anders Roxelle8557d12015-04-27 22:53:09 +020081 select IRQ_FORCED_THREADING
Catalin Marinasfea2aca2012-10-16 11:26:57 +010082 select MODULES_USE_ELF_RELA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010083 select NO_BOOTMEM
84 select OF
85 select OF_EARLY_FLATTREE
Marek Szyprowski9bf14b72014-02-28 14:42:55 +010086 select OF_RESERVED_MEM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010087 select PERF_USE_VMALLOC
Catalin Marinasaa1e8ec2013-02-28 18:14:37 +000088 select POWER_RESET
89 select POWER_SUPPLY
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010090 select RTC_LIB
91 select SPARSE_IRQ
Catalin Marinas7ac57a82012-10-08 16:28:16 -070092 select SYSCTL_EXCEPTION_TRACE
Larry Bassel6c81fe72014-05-30 12:34:15 -070093 select HAVE_CONTEXT_TRACKING
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010094 help
95 ARM 64-bit (AArch64) Linux support.
96
97config 64BIT
98 def_bool y
99
100config ARCH_PHYS_ADDR_T_64BIT
101 def_bool y
102
103config MMU
104 def_bool y
105
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700106config NO_IOPORT_MAP
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100107 def_bool y if !PCI
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100108
109config STACKTRACE_SUPPORT
110 def_bool y
111
Jeff Vander Stoepbf0c4e02015-08-18 20:50:10 +0100112config ILLEGAL_POINTER_VALUE
113 hex
114 default 0xdead000000000000
115
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100116config LOCKDEP_SUPPORT
117 def_bool y
118
119config TRACE_IRQFLAGS_SUPPORT
120 def_bool y
121
Will Deaconc209f792014-03-14 17:47:05 +0000122config RWSEM_XCHGADD_ALGORITHM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100123 def_bool y
124
Dave P Martin9fb74102015-07-24 16:37:48 +0100125config GENERIC_BUG
126 def_bool y
127 depends on BUG
128
129config GENERIC_BUG_RELATIVE_POINTERS
130 def_bool y
131 depends on GENERIC_BUG
132
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100133config GENERIC_HWEIGHT
134 def_bool y
135
136config GENERIC_CSUM
137 def_bool y
138
139config GENERIC_CALIBRATE_DELAY
140 def_bool y
141
Catalin Marinas19e76402014-02-27 12:09:22 +0000142config ZONE_DMA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100143 def_bool y
144
Steve Capper29e56942014-10-09 15:29:25 -0700145config HAVE_GENERIC_RCU_GUP
146 def_bool y
147
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100148config ARCH_DMA_ADDR_T_64BIT
149 def_bool y
150
151config NEED_DMA_MAP_STATE
152 def_bool y
153
154config NEED_SG_DMA_LENGTH
155 def_bool y
156
Will Deacon4b3dc962015-05-29 18:28:44 +0100157config SMP
158 def_bool y
159
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100160config SWIOTLB
161 def_bool y
162
163config IOMMU_HELPER
164 def_bool SWIOTLB
165
Ard Biesheuvel4cfb3612013-07-09 14:18:12 +0100166config KERNEL_MODE_NEON
167 def_bool y
168
Rob Herring92cc15f2014-04-18 17:19:59 -0500169config FIX_EARLYCON_MEM
170 def_bool y
171
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700172config PGTABLE_LEVELS
173 int
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100174 default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700175 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
176 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
177 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100178 default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
179 default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700180
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100181source "init/Kconfig"
182
183source "kernel/Kconfig.freezer"
184
Olof Johansson6a377492015-07-20 12:09:16 -0700185source "arch/arm64/Kconfig.platforms"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100186
187menu "Bus support"
188
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100189config PCI
190 bool "PCI support"
191 help
192 This feature enables support for PCI bus system. If you say Y
193 here, the kernel will include drivers and infrastructure code
194 to support PCI bus devices.
195
196config PCI_DOMAINS
197 def_bool PCI
198
199config PCI_DOMAINS_GENERIC
200 def_bool PCI
201
202config PCI_SYSCALL
203 def_bool PCI
204
205source "drivers/pci/Kconfig"
206source "drivers/pci/pcie/Kconfig"
207source "drivers/pci/hotplug/Kconfig"
208
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100209endmenu
210
211menu "Kernel Features"
212
Andre Przywarac0a01b82014-11-14 15:54:12 +0000213menu "ARM errata workarounds via the alternatives framework"
214
215config ARM64_ERRATUM_826319
216 bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
217 default y
218 help
219 This option adds an alternative code sequence to work around ARM
220 erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
221 AXI master interface and an L2 cache.
222
223 If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
224 and is unable to accept a certain write via this interface, it will
225 not progress on read data presented on the read data channel and the
226 system can deadlock.
227
228 The workaround promotes data cache clean instructions to
229 data cache clean-and-invalidate.
230 Please note that this does not necessarily enable the workaround,
231 as it depends on the alternative framework, which will only patch
232 the kernel if an affected CPU is detected.
233
234 If unsure, say Y.
235
236config ARM64_ERRATUM_827319
237 bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
238 default y
239 help
240 This option adds an alternative code sequence to work around ARM
241 erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
242 master interface and an L2 cache.
243
244 Under certain conditions this erratum can cause a clean line eviction
245 to occur at the same time as another transaction to the same address
246 on the AMBA 5 CHI interface, which can cause data corruption if the
247 interconnect reorders the two transactions.
248
249 The workaround promotes data cache clean instructions to
250 data cache clean-and-invalidate.
251 Please note that this does not necessarily enable the workaround,
252 as it depends on the alternative framework, which will only patch
253 the kernel if an affected CPU is detected.
254
255 If unsure, say Y.
256
257config ARM64_ERRATUM_824069
258 bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
259 default y
260 help
261 This option adds an alternative code sequence to work around ARM
262 erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
263 to a coherent interconnect.
264
265 If a Cortex-A53 processor is executing a store or prefetch for
266 write instruction at the same time as a processor in another
267 cluster is executing a cache maintenance operation to the same
268 address, then this erratum might cause a clean cache line to be
269 incorrectly marked as dirty.
270
271 The workaround promotes data cache clean instructions to
272 data cache clean-and-invalidate.
273 Please note that this option does not necessarily enable the
274 workaround, as it depends on the alternative framework, which will
275 only patch the kernel if an affected CPU is detected.
276
277 If unsure, say Y.
278
279config ARM64_ERRATUM_819472
280 bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
281 default y
282 help
283 This option adds an alternative code sequence to work around ARM
284 erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
285 present when it is connected to a coherent interconnect.
286
287 If the processor is executing a load and store exclusive sequence at
288 the same time as a processor in another cluster is executing a cache
289 maintenance operation to the same address, then this erratum might
290 cause data corruption.
291
292 The workaround promotes data cache clean instructions to
293 data cache clean-and-invalidate.
294 Please note that this does not necessarily enable the workaround,
295 as it depends on the alternative framework, which will only patch
296 the kernel if an affected CPU is detected.
297
298 If unsure, say Y.
299
300config ARM64_ERRATUM_832075
301 bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
302 default y
303 help
304 This option adds an alternative code sequence to work around ARM
305 erratum 832075 on Cortex-A57 parts up to r1p2.
306
307 Affected Cortex-A57 parts might deadlock when exclusive load/store
308 instructions to Write-Back memory are mixed with Device loads.
309
310 The workaround is to promote device loads to use Load-Acquire
311 semantics.
312 Please note that this does not necessarily enable the workaround,
313 as it depends on the alternative framework, which will only patch
314 the kernel if an affected CPU is detected.
315
316 If unsure, say Y.
317
Will Deacon905e8c52015-03-23 19:07:02 +0000318config ARM64_ERRATUM_845719
319 bool "Cortex-A53: 845719: a load might read incorrect data"
320 depends on COMPAT
321 default y
322 help
323 This option adds an alternative code sequence to work around ARM
324 erratum 845719 on Cortex-A53 parts up to r0p4.
325
326 When running a compat (AArch32) userspace on an affected Cortex-A53
327 part, a load at EL0 from a virtual address that matches the bottom 32
328 bits of the virtual address used by a recent load at (AArch64) EL1
329 might return incorrect data.
330
331 The workaround is to write the contextidr_el1 register on exception
332 return to a 32-bit task.
333 Please note that this does not necessarily enable the workaround,
334 as it depends on the alternative framework, which will only patch
335 the kernel if an affected CPU is detected.
336
337 If unsure, say Y.
338
Will Deacondf057cc2015-03-17 12:15:02 +0000339config ARM64_ERRATUM_843419
340 bool "Cortex-A53: 843419: A load or store might access an incorrect address"
341 depends on MODULES
342 default y
343 help
344 This option builds kernel modules using the large memory model in
345 order to avoid the use of the ADRP instruction, which can cause
346 a subsequent memory access to use an incorrect address on Cortex-A53
347 parts up to r0p4.
348
349 Note that the kernel itself must be linked with a version of ld
350 which fixes potentially affected ADRP instructions through the
351 use of veneers.
352
353 If unsure, say Y.
354
Andre Przywarac0a01b82014-11-14 15:54:12 +0000355endmenu
356
357
Jungseok Leee41ceed2014-05-12 10:40:38 +0100358choice
359 prompt "Page size"
360 default ARM64_4K_PAGES
361 help
362 Page size (translation granule) configuration.
363
364config ARM64_4K_PAGES
365 bool "4KB"
366 help
367 This feature enables 4KB pages support.
368
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100369config ARM64_16K_PAGES
370 bool "16KB"
371 help
372 The system will use 16KB pages support. AArch32 emulation
373 requires applications compiled with 16K (or a multiple of 16K)
374 aligned segments.
375
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100376config ARM64_64K_PAGES
Jungseok Leee41ceed2014-05-12 10:40:38 +0100377 bool "64KB"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100378 help
379 This feature enables 64KB pages support (4KB by default)
380 allowing only two levels of page tables and faster TLB
Suzuki K. Poulosedb488be2015-10-19 14:19:34 +0100381 look-up. AArch32 emulation requires applications compiled
382 with 64K aligned segments.
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100383
Jungseok Leee41ceed2014-05-12 10:40:38 +0100384endchoice
385
386choice
387 prompt "Virtual address space size"
388 default ARM64_VA_BITS_39 if ARM64_4K_PAGES
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100389 default ARM64_VA_BITS_47 if ARM64_16K_PAGES
Jungseok Leee41ceed2014-05-12 10:40:38 +0100390 default ARM64_VA_BITS_42 if ARM64_64K_PAGES
391 help
392 Allows choosing one of multiple possible virtual address
393 space sizes. The level of translation table is determined by
394 a combination of page size and virtual address space size.
395
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100396config ARM64_VA_BITS_36
Catalin Marinas56a3f302015-10-20 14:59:20 +0100397 bool "36-bit" if EXPERT
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100398 depends on ARM64_16K_PAGES
399
Jungseok Leee41ceed2014-05-12 10:40:38 +0100400config ARM64_VA_BITS_39
401 bool "39-bit"
402 depends on ARM64_4K_PAGES
403
404config ARM64_VA_BITS_42
405 bool "42-bit"
406 depends on ARM64_64K_PAGES
407
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100408config ARM64_VA_BITS_47
409 bool "47-bit"
410 depends on ARM64_16K_PAGES
411
Jungseok Leec79b9542014-05-12 18:40:51 +0900412config ARM64_VA_BITS_48
413 bool "48-bit"
Jungseok Leec79b9542014-05-12 18:40:51 +0900414
Jungseok Leee41ceed2014-05-12 10:40:38 +0100415endchoice
416
417config ARM64_VA_BITS
418 int
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100419 default 36 if ARM64_VA_BITS_36
Jungseok Leee41ceed2014-05-12 10:40:38 +0100420 default 39 if ARM64_VA_BITS_39
421 default 42 if ARM64_VA_BITS_42
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100422 default 47 if ARM64_VA_BITS_47
Jungseok Leec79b9542014-05-12 18:40:51 +0900423 default 48 if ARM64_VA_BITS_48
Jungseok Leee41ceed2014-05-12 10:40:38 +0100424
Will Deacona8720132013-10-11 14:52:19 +0100425config CPU_BIG_ENDIAN
426 bool "Build big-endian kernel"
427 help
428 Say Y if you plan on running a kernel in big-endian mode.
429
Mark Brownf6e763b2014-03-04 07:51:17 +0000430config SCHED_MC
431 bool "Multi-core scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000432 help
433 Multi-core scheduler support improves the CPU scheduler's decision
434 making when dealing with multi-core CPU chips at a cost of slightly
435 increased overhead in some places. If unsure say N here.
436
437config SCHED_SMT
438 bool "SMT scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000439 help
440 Improves the CPU scheduler's decision making when dealing with
441 MultiThreading at a cost of slightly increased overhead in some
442 places. If unsure say N here.
443
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100444config NR_CPUS
Ganapatrao Kulkarni62aa9652015-03-18 11:01:18 +0000445 int "Maximum number of CPUs (2-4096)"
446 range 2 4096
Vinayak Kale15942852013-04-24 10:06:57 +0100447 # These have to remain sorted largest to smallest
Robert Richtere3672642014-09-08 12:44:48 +0100448 default "64"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100449
Mark Rutland9327e2c2013-10-24 20:30:18 +0100450config HOTPLUG_CPU
451 bool "Support for hot-pluggable CPUs"
Yang Yingliang217d4532015-09-24 17:32:14 +0800452 select GENERIC_IRQ_MIGRATION
Mark Rutland9327e2c2013-10-24 20:30:18 +0100453 help
454 Say Y here to experiment with turning CPUs off and on. CPUs
455 can be controlled through /sys/devices/system/cpu.
456
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100457source kernel/Kconfig.preempt
Kefeng Wangf90df5e2015-10-26 11:48:16 +0800458source kernel/Kconfig.hz
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100459
460config ARCH_HAS_HOLES_MEMORYMODEL
461 def_bool y if SPARSEMEM
462
463config ARCH_SPARSEMEM_ENABLE
464 def_bool y
465 select SPARSEMEM_VMEMMAP_ENABLE
466
467config ARCH_SPARSEMEM_DEFAULT
468 def_bool ARCH_SPARSEMEM_ENABLE
469
470config ARCH_SELECT_MEMORY_MODEL
471 def_bool ARCH_SPARSEMEM_ENABLE
472
473config HAVE_ARCH_PFN_VALID
474 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
475
476config HW_PERF_EVENTS
Mark Rutland6475b2d2015-10-02 10:55:03 +0100477 def_bool y
478 depends on ARM_PMU
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100479
Steve Capper084bd292013-04-10 13:48:00 +0100480config SYS_SUPPORTS_HUGETLBFS
481 def_bool y
482
483config ARCH_WANT_GENERAL_HUGETLB
484 def_bool y
485
486config ARCH_WANT_HUGE_PMD_SHARE
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100487 def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
Steve Capper084bd292013-04-10 13:48:00 +0100488
Steve Capperaf074842013-04-19 16:23:57 +0100489config HAVE_ARCH_TRANSPARENT_HUGEPAGE
490 def_bool y
491
Catalin Marinasa41dc0e2014-04-03 17:48:54 +0100492config ARCH_HAS_CACHE_LINE_SIZE
493 def_bool y
494
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100495source "mm/Kconfig"
496
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +0000497config SECCOMP
498 bool "Enable seccomp to safely compute untrusted bytecode"
499 ---help---
500 This kernel feature is useful for number crunching applications
501 that may need to compute untrusted bytecode during their
502 execution. By using pipes or other transports made available to
503 the process as file descriptors supporting the read/write
504 syscalls, it's possible to isolate those applications in
505 their own address space using seccomp. Once seccomp is
506 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
507 and the task is only allowed to execute a few safe syscalls
508 defined by each seccomp mode.
509
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000510config XEN_DOM0
511 def_bool y
512 depends on XEN
513
514config XEN
Julien Grallc2ba1f72014-09-17 14:07:06 -0700515 bool "Xen guest support on ARM64"
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000516 depends on ARM64 && OF
Stefano Stabellini83862cc2013-10-10 13:40:44 +0000517 select SWIOTLB_XEN
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000518 help
519 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
520
Steve Capperd03bb142013-04-25 15:19:21 +0100521config FORCE_MAX_ZONEORDER
522 int
523 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100524 default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE)
Steve Capperd03bb142013-04-25 15:19:21 +0100525 default "11"
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100526 help
527 The kernel memory allocator divides physically contiguous memory
528 blocks into "zones", where each zone is a power of two number of
529 pages. This option selects the largest power of two that the kernel
530 keeps in the memory allocator. If you need to allocate very large
531 blocks of physically contiguous memory, then you may need to
532 increase this value.
533
534 This config option is actually maximum order plus one. For example,
535 a value of 11 means that the largest free memory block is 2^10 pages.
536
537 We make sure that we can allocate upto a HugePage size for each configuration.
538 Hence we have :
539 MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2
540
541 However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
542 4M allocations matching the default size used by generic code.
Steve Capperd03bb142013-04-25 15:19:21 +0100543
Will Deacon1b907f42014-11-20 16:51:10 +0000544menuconfig ARMV8_DEPRECATED
545 bool "Emulate deprecated/obsolete ARMv8 instructions"
546 depends on COMPAT
547 help
548 Legacy software support may require certain instructions
549 that have been deprecated or obsoleted in the architecture.
550
551 Enable this config to enable selective emulation of these
552 features.
553
554 If unsure, say Y
555
556if ARMV8_DEPRECATED
557
558config SWP_EMULATION
559 bool "Emulate SWP/SWPB instructions"
560 help
561 ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
562 they are always undefined. Say Y here to enable software
563 emulation of these instructions for userspace using LDXR/STXR.
564
565 In some older versions of glibc [<=2.8] SWP is used during futex
566 trylock() operations with the assumption that the code will not
567 be preempted. This invalid assumption may be more likely to fail
568 with SWP emulation enabled, leading to deadlock of the user
569 application.
570
571 NOTE: when accessing uncached shared regions, LDXR/STXR rely
572 on an external transaction monitoring block called a global
573 monitor to maintain update atomicity. If your system does not
574 implement a global monitor, this option can cause programs that
575 perform SWP operations to uncached memory to deadlock.
576
577 If unsure, say Y
578
579config CP15_BARRIER_EMULATION
580 bool "Emulate CP15 Barrier instructions"
581 help
582 The CP15 barrier instructions - CP15ISB, CP15DSB, and
583 CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
584 strongly recommended to use the ISB, DSB, and DMB
585 instructions instead.
586
587 Say Y here to enable software emulation of these
588 instructions for AArch32 userspace code. When this option is
589 enabled, CP15 barrier usage is traced which can help
590 identify software that needs updating.
591
592 If unsure, say Y
593
Suzuki K. Poulose2d888f42015-01-21 12:43:11 +0000594config SETEND_EMULATION
595 bool "Emulate SETEND instruction"
596 help
597 The SETEND instruction alters the data-endianness of the
598 AArch32 EL0, and is deprecated in ARMv8.
599
600 Say Y here to enable software emulation of the instruction
601 for AArch32 userspace code.
602
603 Note: All the cpus on the system must have mixed endian support at EL0
604 for this feature to be enabled. If a new CPU - which doesn't support mixed
605 endian - is hotplugged in after this feature has been enabled, there could
606 be unexpected results in the applications.
607
608 If unsure, say Y
Will Deacon1b907f42014-11-20 16:51:10 +0000609endif
610
Will Deacon0e4a0702015-07-27 15:54:13 +0100611menu "ARMv8.1 architectural features"
612
613config ARM64_HW_AFDBM
614 bool "Support for hardware updates of the Access and Dirty page flags"
615 default y
616 help
617 The ARMv8.1 architecture extensions introduce support for
618 hardware updates of the access and dirty information in page
619 table entries. When enabled in TCR_EL1 (HA and HD bits) on
620 capable processors, accesses to pages with PTE_AF cleared will
621 set this bit instead of raising an access flag fault.
622 Similarly, writes to read-only pages with the DBM bit set will
623 clear the read-only bit (AP[2]) instead of raising a
624 permission fault.
625
626 Kernels built with this configuration option enabled continue
627 to work on pre-ARMv8.1 hardware and the performance impact is
628 minimal. If unsure, say Y.
629
630config ARM64_PAN
631 bool "Enable support for Privileged Access Never (PAN)"
632 default y
633 help
634 Privileged Access Never (PAN; part of the ARMv8.1 Extensions)
635 prevents the kernel or hypervisor from accessing user-space (EL0)
636 memory directly.
637
638 Choosing this option will cause any unprotected (not using
639 copy_to_user et al) memory access to fail with a permission fault.
640
641 The feature is detected at runtime, and will remain as a 'nop'
642 instruction if the cpu does not implement the feature.
643
644config ARM64_LSE_ATOMICS
645 bool "Atomic instructions"
646 help
647 As part of the Large System Extensions, ARMv8.1 introduces new
648 atomic instructions that are designed specifically to scale in
649 very large systems.
650
651 Say Y here to make use of these instructions for the in-kernel
652 atomic routines. This incurs a small overhead on CPUs that do
653 not support these instructions and requires the kernel to be
654 built with binutils >= 2.25.
655
656endmenu
657
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100658endmenu
659
660menu "Boot options"
661
662config CMDLINE
663 string "Default kernel command string"
664 default ""
665 help
666 Provide a set of default command-line options at build time by
667 entering them here. As a minimum, you should specify the the
668 root device (e.g. root=/dev/nfs).
669
670config CMDLINE_FORCE
671 bool "Always use the default kernel command string"
672 help
673 Always use the default kernel command string, even if the boot
674 loader passes other arguments to the kernel.
675 This is useful if you cannot or don't want to change the
676 command-line options your boot loader passes to the kernel.
677
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200678config EFI_STUB
679 bool
680
Mark Salterf84d0272014-04-15 21:59:30 -0400681config EFI
682 bool "UEFI runtime support"
683 depends on OF && !CPU_BIG_ENDIAN
684 select LIBFDT
685 select UCS2_STRING
686 select EFI_PARAMS_FROM_FDT
Ard Biesheuvele15dd492014-07-04 19:41:53 +0200687 select EFI_RUNTIME_WRAPPERS
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200688 select EFI_STUB
689 select EFI_ARMSTUB
Mark Salterf84d0272014-04-15 21:59:30 -0400690 default y
691 help
692 This option provides support for runtime services provided
693 by UEFI firmware (such as non-volatile variables, realtime
Mark Salter3c7f2552014-04-15 22:47:52 -0400694 clock, and platform reset). A UEFI stub is also provided to
695 allow the kernel to be booted as an EFI application. This
696 is only useful on systems that have UEFI firmware.
Mark Salterf84d0272014-04-15 21:59:30 -0400697
Yi Lid1ae8c02014-10-04 23:46:43 +0800698config DMI
699 bool "Enable support for SMBIOS (DMI) tables"
700 depends on EFI
701 default y
702 help
703 This enables SMBIOS/DMI feature for systems.
704
705 This option is only useful on systems that have UEFI firmware.
706 However, even with this option, the resultant kernel should
707 continue to boot on existing non-UEFI platforms.
708
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100709endmenu
710
711menu "Userspace binary formats"
712
713source "fs/Kconfig.binfmt"
714
715config COMPAT
716 bool "Kernel support for 32-bit EL0"
Suzuki K. Poulose755e70b2015-10-19 14:19:32 +0100717 depends on ARM64_4K_PAGES || EXPERT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100718 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -0700719 select HAVE_UID16
Al Viro84b9e9b2012-12-25 16:29:11 -0500720 select OLD_SIGSUSPEND3
Al Viro51682032012-12-25 19:31:29 -0500721 select COMPAT_OLD_SIGACTION
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100722 help
723 This option enables support for a 32-bit EL0 running under a 64-bit
724 kernel at EL1. AArch32-specific components such as system calls,
725 the user helper functions, VFP support and the ptrace interface are
726 handled appropriately by the kernel.
727
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100728 If you use a page size other than 4KB (i.e, 16KB or 64KB), please be aware
729 that you will only be able to execute AArch32 binaries that were compiled
730 with page size aligned segments.
Alexander Grafa8fcd8b2015-03-16 16:32:23 +0000731
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100732 If you want to execute 32-bit userspace applications, say Y.
733
734config SYSVIPC_COMPAT
735 def_bool y
736 depends on COMPAT && SYSVIPC
737
738endmenu
739
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000740menu "Power management options"
741
742source "kernel/power/Kconfig"
743
744config ARCH_SUSPEND_POSSIBLE
745 def_bool y
746
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000747endmenu
748
Lorenzo Pieralisi13072202013-07-17 14:54:21 +0100749menu "CPU Power Management"
750
751source "drivers/cpuidle/Kconfig"
752
Rob Herring52e7e812014-02-24 11:27:57 +0900753source "drivers/cpufreq/Kconfig"
754
755endmenu
756
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100757source "net/Kconfig"
758
759source "drivers/Kconfig"
760
Mark Salterf84d0272014-04-15 21:59:30 -0400761source "drivers/firmware/Kconfig"
762
Graeme Gregoryb6a02172015-03-24 14:02:53 +0000763source "drivers/acpi/Kconfig"
764
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100765source "fs/Kconfig"
766
Marc Zyngierc3eb5b12013-07-04 13:34:32 +0100767source "arch/arm64/kvm/Kconfig"
768
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100769source "arch/arm64/Kconfig.debug"
770
771source "security/Kconfig"
772
773source "crypto/Kconfig"
Ard Biesheuvel2c988332014-03-06 16:23:33 +0800774if CRYPTO
775source "arch/arm64/crypto/Kconfig"
776endif
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100777
778source "lib/Kconfig"