blob: a346671d474e223ce3adbbe697ba08a4f741d8ae [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
Laura Abbottd4932f92014-10-09 15:26:44 -070030 select GENERIC_ALLOCATOR
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010031 select GENERIC_CLOCKEVENTS
Will Deacon4b3dc962015-05-29 18:28:44 +010032 select GENERIC_CLOCKEVENTS_BROADCAST
Ard Biesheuvel3be1a5c2014-03-04 01:10:04 +000033 select GENERIC_CPU_AUTOPROBE
Mark Salterbf4b5582014-04-07 15:39:52 -070034 select GENERIC_EARLY_IOREMAP
Leo Yan2314ee42015-08-21 04:40:22 +010035 select GENERIC_IDLE_POLL_SETUP
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010036 select GENERIC_IRQ_PROBE
37 select GENERIC_IRQ_SHOW
Sudeep Holla6544e672015-04-22 18:16:33 +010038 select GENERIC_IRQ_SHOW_LEVEL
Arnd Bergmanncb61f672014-11-19 14:09:07 +010039 select GENERIC_PCI_IOMAP
Stephen Boyd65cd4f62013-07-18 16:21:18 -070040 select GENERIC_SCHED_CLOCK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010041 select GENERIC_SMP_IDLE_THREAD
Will Deacon12a0ef72013-11-06 17:20:22 +000042 select GENERIC_STRNCPY_FROM_USER
43 select GENERIC_STRNLEN_USER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010044 select GENERIC_TIME_VSYSCALL
Marc Zyngiera1ddc742014-08-26 11:03:17 +010045 select HANDLE_DOMAIN_IRQ
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010046 select HARDIRQS_SW_RESEND
Steve Capper5284e1b2014-10-24 13:22:20 +010047 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010048 select HAVE_ARCH_AUDITSYSCALL
Yalin Wang8e7a4ce2014-11-03 03:02:23 +010049 select HAVE_ARCH_BITREVERSE
Jiang Liu9732caf2014-01-07 22:17:13 +080050 select HAVE_ARCH_JUMP_LABEL
Andrey Ryabinin39d114d2015-10-12 18:52:58 +030051 select HAVE_ARCH_KASAN if SPARSEMEM_VMEMMAP
Vijaya Kumar K95292472014-01-28 11:20:22 +000052 select HAVE_ARCH_KGDB
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +000053 select HAVE_ARCH_SECCOMP_FILTER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010054 select HAVE_ARCH_TRACEHOOK
Zi Shen Lime54bcde2014-08-26 21:15:30 -070055 select HAVE_BPF_JIT
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010056 select HAVE_C_RECORDMCOUNT
Laura Abbottc0c264a2014-06-25 23:55:03 +010057 select HAVE_CC_STACKPROTECTOR
Steve Capper5284e1b2014-10-24 13:22:20 +010058 select HAVE_CMPXCHG_DOUBLE
Will Deacon95eff6b2015-05-29 14:57:47 +010059 select HAVE_CMPXCHG_LOCAL
Catalin Marinas9b2a60c2012-10-08 16:28:13 -070060 select HAVE_DEBUG_BUGVERBOSE
Catalin Marinasb69ec422012-10-08 16:28:11 -070061 select HAVE_DEBUG_KMEMLEAK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010062 select HAVE_DMA_API_DEBUG
63 select HAVE_DMA_ATTRS
Laura Abbott6ac21042013-12-12 19:28:33 +000064 select HAVE_DMA_CONTIGUOUS
AKASHI Takahirobd7d38d2014-04-30 10:54:34 +010065 select HAVE_DYNAMIC_FTRACE
Will Deacon50afc332013-12-16 17:50:08 +000066 select HAVE_EFFICIENT_UNALIGNED_ACCESS
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010067 select HAVE_FTRACE_MCOUNT_RECORD
AKASHI Takahiro819e50e2014-04-30 18:54:33 +090068 select HAVE_FUNCTION_TRACER
69 select HAVE_FUNCTION_GRAPH_TRACER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010070 select HAVE_GENERIC_DMA_COHERENT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010071 select HAVE_HW_BREAKPOINT if PERF_EVENTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010072 select HAVE_MEMBLOCK
Mark Rutland55834a72014-02-07 17:12:45 +000073 select HAVE_PATA_PLATFORM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010074 select HAVE_PERF_EVENTS
Jean Pihet2ee0d7f2014-02-03 19:18:27 +010075 select HAVE_PERF_REGS
76 select HAVE_PERF_USER_STACK_DUMP
Steve Capper5e5f6dc2014-10-09 15:29:23 -070077 select HAVE_RCU_TABLE_FREE
AKASHI Takahiro055b1212014-04-30 10:54:36 +010078 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010079 select IRQ_DOMAIN
Anders Roxelle8557d12015-04-27 22:53:09 +020080 select IRQ_FORCED_THREADING
Catalin Marinasfea2aca2012-10-16 11:26:57 +010081 select MODULES_USE_ELF_RELA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010082 select NO_BOOTMEM
83 select OF
84 select OF_EARLY_FLATTREE
Marek Szyprowski9bf14b72014-02-28 14:42:55 +010085 select OF_RESERVED_MEM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010086 select PERF_USE_VMALLOC
Catalin Marinasaa1e8ec2013-02-28 18:14:37 +000087 select POWER_RESET
88 select POWER_SUPPLY
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010089 select RTC_LIB
90 select SPARSE_IRQ
Catalin Marinas7ac57a82012-10-08 16:28:16 -070091 select SYSCTL_EXCEPTION_TRACE
Larry Bassel6c81fe72014-05-30 12:34:15 -070092 select HAVE_CONTEXT_TRACKING
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010093 help
94 ARM 64-bit (AArch64) Linux support.
95
96config 64BIT
97 def_bool y
98
99config ARCH_PHYS_ADDR_T_64BIT
100 def_bool y
101
102config MMU
103 def_bool y
104
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700105config NO_IOPORT_MAP
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100106 def_bool y if !PCI
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100107
108config STACKTRACE_SUPPORT
109 def_bool y
110
Jeff Vander Stoepbf0c4e02015-08-18 20:50:10 +0100111config ILLEGAL_POINTER_VALUE
112 hex
113 default 0xdead000000000000
114
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100115config LOCKDEP_SUPPORT
116 def_bool y
117
118config TRACE_IRQFLAGS_SUPPORT
119 def_bool y
120
Will Deaconc209f792014-03-14 17:47:05 +0000121config RWSEM_XCHGADD_ALGORITHM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100122 def_bool y
123
Dave P Martin9fb74102015-07-24 16:37:48 +0100124config GENERIC_BUG
125 def_bool y
126 depends on BUG
127
128config GENERIC_BUG_RELATIVE_POINTERS
129 def_bool y
130 depends on GENERIC_BUG
131
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100132config GENERIC_HWEIGHT
133 def_bool y
134
135config GENERIC_CSUM
136 def_bool y
137
138config GENERIC_CALIBRATE_DELAY
139 def_bool y
140
Catalin Marinas19e76402014-02-27 12:09:22 +0000141config ZONE_DMA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100142 def_bool y
143
Steve Capper29e56942014-10-09 15:29:25 -0700144config HAVE_GENERIC_RCU_GUP
145 def_bool y
146
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100147config ARCH_DMA_ADDR_T_64BIT
148 def_bool y
149
150config NEED_DMA_MAP_STATE
151 def_bool y
152
153config NEED_SG_DMA_LENGTH
154 def_bool y
155
Will Deacon4b3dc962015-05-29 18:28:44 +0100156config SMP
157 def_bool y
158
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100159config SWIOTLB
160 def_bool y
161
162config IOMMU_HELPER
163 def_bool SWIOTLB
164
Ard Biesheuvel4cfb3612013-07-09 14:18:12 +0100165config KERNEL_MODE_NEON
166 def_bool y
167
Rob Herring92cc15f2014-04-18 17:19:59 -0500168config FIX_EARLYCON_MEM
169 def_bool y
170
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700171config PGTABLE_LEVELS
172 int
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100173 default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700174 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
175 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
176 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100177 default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47
178 default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700179
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100180source "init/Kconfig"
181
182source "kernel/Kconfig.freezer"
183
Olof Johansson6a377492015-07-20 12:09:16 -0700184source "arch/arm64/Kconfig.platforms"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100185
186menu "Bus support"
187
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100188config PCI
189 bool "PCI support"
190 help
191 This feature enables support for PCI bus system. If you say Y
192 here, the kernel will include drivers and infrastructure code
193 to support PCI bus devices.
194
195config PCI_DOMAINS
196 def_bool PCI
197
198config PCI_DOMAINS_GENERIC
199 def_bool PCI
200
201config PCI_SYSCALL
202 def_bool PCI
203
204source "drivers/pci/Kconfig"
205source "drivers/pci/pcie/Kconfig"
206source "drivers/pci/hotplug/Kconfig"
207
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100208endmenu
209
210menu "Kernel Features"
211
Andre Przywarac0a01b82014-11-14 15:54:12 +0000212menu "ARM errata workarounds via the alternatives framework"
213
214config ARM64_ERRATUM_826319
215 bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
216 default y
217 help
218 This option adds an alternative code sequence to work around ARM
219 erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
220 AXI master interface and an L2 cache.
221
222 If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
223 and is unable to accept a certain write via this interface, it will
224 not progress on read data presented on the read data channel and the
225 system can deadlock.
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
235config ARM64_ERRATUM_827319
236 bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
237 default y
238 help
239 This option adds an alternative code sequence to work around ARM
240 erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
241 master interface and an L2 cache.
242
243 Under certain conditions this erratum can cause a clean line eviction
244 to occur at the same time as another transaction to the same address
245 on the AMBA 5 CHI interface, which can cause data corruption if the
246 interconnect reorders the two transactions.
247
248 The workaround promotes data cache clean instructions to
249 data cache clean-and-invalidate.
250 Please note that this does not necessarily enable the workaround,
251 as it depends on the alternative framework, which will only patch
252 the kernel if an affected CPU is detected.
253
254 If unsure, say Y.
255
256config ARM64_ERRATUM_824069
257 bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
258 default y
259 help
260 This option adds an alternative code sequence to work around ARM
261 erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
262 to a coherent interconnect.
263
264 If a Cortex-A53 processor is executing a store or prefetch for
265 write instruction at the same time as a processor in another
266 cluster is executing a cache maintenance operation to the same
267 address, then this erratum might cause a clean cache line to be
268 incorrectly marked as dirty.
269
270 The workaround promotes data cache clean instructions to
271 data cache clean-and-invalidate.
272 Please note that this option does not necessarily enable the
273 workaround, as it depends on the alternative framework, which will
274 only patch the kernel if an affected CPU is detected.
275
276 If unsure, say Y.
277
278config ARM64_ERRATUM_819472
279 bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
280 default y
281 help
282 This option adds an alternative code sequence to work around ARM
283 erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
284 present when it is connected to a coherent interconnect.
285
286 If the processor is executing a load and store exclusive sequence at
287 the same time as a processor in another cluster is executing a cache
288 maintenance operation to the same address, then this erratum might
289 cause data corruption.
290
291 The workaround promotes data cache clean instructions to
292 data cache clean-and-invalidate.
293 Please note that this does not necessarily enable the workaround,
294 as it depends on the alternative framework, which will only patch
295 the kernel if an affected CPU is detected.
296
297 If unsure, say Y.
298
299config ARM64_ERRATUM_832075
300 bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
301 default y
302 help
303 This option adds an alternative code sequence to work around ARM
304 erratum 832075 on Cortex-A57 parts up to r1p2.
305
306 Affected Cortex-A57 parts might deadlock when exclusive load/store
307 instructions to Write-Back memory are mixed with Device loads.
308
309 The workaround is to promote device loads to use Load-Acquire
310 semantics.
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
Will Deacon905e8c52015-03-23 19:07:02 +0000317config ARM64_ERRATUM_845719
318 bool "Cortex-A53: 845719: a load might read incorrect data"
319 depends on COMPAT
320 default y
321 help
322 This option adds an alternative code sequence to work around ARM
323 erratum 845719 on Cortex-A53 parts up to r0p4.
324
325 When running a compat (AArch32) userspace on an affected Cortex-A53
326 part, a load at EL0 from a virtual address that matches the bottom 32
327 bits of the virtual address used by a recent load at (AArch64) EL1
328 might return incorrect data.
329
330 The workaround is to write the contextidr_el1 register on exception
331 return to a 32-bit task.
332 Please note that this does not necessarily enable the workaround,
333 as it depends on the alternative framework, which will only patch
334 the kernel if an affected CPU is detected.
335
336 If unsure, say Y.
337
Will Deacondf057cc2015-03-17 12:15:02 +0000338config ARM64_ERRATUM_843419
339 bool "Cortex-A53: 843419: A load or store might access an incorrect address"
340 depends on MODULES
341 default y
342 help
343 This option builds kernel modules using the large memory model in
344 order to avoid the use of the ADRP instruction, which can cause
345 a subsequent memory access to use an incorrect address on Cortex-A53
346 parts up to r0p4.
347
348 Note that the kernel itself must be linked with a version of ld
349 which fixes potentially affected ADRP instructions through the
350 use of veneers.
351
352 If unsure, say Y.
353
Andre Przywarac0a01b82014-11-14 15:54:12 +0000354endmenu
355
356
Jungseok Leee41ceed2014-05-12 10:40:38 +0100357choice
358 prompt "Page size"
359 default ARM64_4K_PAGES
360 help
361 Page size (translation granule) configuration.
362
363config ARM64_4K_PAGES
364 bool "4KB"
365 help
366 This feature enables 4KB pages support.
367
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100368config ARM64_16K_PAGES
369 bool "16KB"
370 help
371 The system will use 16KB pages support. AArch32 emulation
372 requires applications compiled with 16K (or a multiple of 16K)
373 aligned segments.
374
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100375config ARM64_64K_PAGES
Jungseok Leee41ceed2014-05-12 10:40:38 +0100376 bool "64KB"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100377 help
378 This feature enables 64KB pages support (4KB by default)
379 allowing only two levels of page tables and faster TLB
Suzuki K. Poulosedb488be2015-10-19 14:19:34 +0100380 look-up. AArch32 emulation requires applications compiled
381 with 64K aligned segments.
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100382
Jungseok Leee41ceed2014-05-12 10:40:38 +0100383endchoice
384
385choice
386 prompt "Virtual address space size"
387 default ARM64_VA_BITS_39 if ARM64_4K_PAGES
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100388 default ARM64_VA_BITS_47 if ARM64_16K_PAGES
Jungseok Leee41ceed2014-05-12 10:40:38 +0100389 default ARM64_VA_BITS_42 if ARM64_64K_PAGES
390 help
391 Allows choosing one of multiple possible virtual address
392 space sizes. The level of translation table is determined by
393 a combination of page size and virtual address space size.
394
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100395config ARM64_VA_BITS_36
396 bool "36-bit"
397 depends on ARM64_16K_PAGES
398
Jungseok Leee41ceed2014-05-12 10:40:38 +0100399config ARM64_VA_BITS_39
400 bool "39-bit"
401 depends on ARM64_4K_PAGES
402
403config ARM64_VA_BITS_42
404 bool "42-bit"
405 depends on ARM64_64K_PAGES
406
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100407config ARM64_VA_BITS_47
408 bool "47-bit"
409 depends on ARM64_16K_PAGES
410
Jungseok Leec79b9542014-05-12 18:40:51 +0900411config ARM64_VA_BITS_48
412 bool "48-bit"
Jungseok Leec79b9542014-05-12 18:40:51 +0900413
Jungseok Leee41ceed2014-05-12 10:40:38 +0100414endchoice
415
416config ARM64_VA_BITS
417 int
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100418 default 36 if ARM64_VA_BITS_36
Jungseok Leee41ceed2014-05-12 10:40:38 +0100419 default 39 if ARM64_VA_BITS_39
420 default 42 if ARM64_VA_BITS_42
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100421 default 47 if ARM64_VA_BITS_47
Jungseok Leec79b9542014-05-12 18:40:51 +0900422 default 48 if ARM64_VA_BITS_48
Jungseok Leee41ceed2014-05-12 10:40:38 +0100423
Will Deacona8720132013-10-11 14:52:19 +0100424config CPU_BIG_ENDIAN
425 bool "Build big-endian kernel"
426 help
427 Say Y if you plan on running a kernel in big-endian mode.
428
Mark Brownf6e763b2014-03-04 07:51:17 +0000429config SCHED_MC
430 bool "Multi-core scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000431 help
432 Multi-core scheduler support improves the CPU scheduler's decision
433 making when dealing with multi-core CPU chips at a cost of slightly
434 increased overhead in some places. If unsure say N here.
435
436config SCHED_SMT
437 bool "SMT scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000438 help
439 Improves the CPU scheduler's decision making when dealing with
440 MultiThreading at a cost of slightly increased overhead in some
441 places. If unsure say N here.
442
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100443config NR_CPUS
Ganapatrao Kulkarni62aa9652015-03-18 11:01:18 +0000444 int "Maximum number of CPUs (2-4096)"
445 range 2 4096
Vinayak Kale15942852013-04-24 10:06:57 +0100446 # These have to remain sorted largest to smallest
Robert Richtere3672642014-09-08 12:44:48 +0100447 default "64"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100448
Mark Rutland9327e2c2013-10-24 20:30:18 +0100449config HOTPLUG_CPU
450 bool "Support for hot-pluggable CPUs"
Yang Yingliang217d4532015-09-24 17:32:14 +0800451 select GENERIC_IRQ_MIGRATION
Mark Rutland9327e2c2013-10-24 20:30:18 +0100452 help
453 Say Y here to experiment with turning CPUs off and on. CPUs
454 can be controlled through /sys/devices/system/cpu.
455
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100456source kernel/Kconfig.preempt
457
458config HZ
459 int
460 default 100
461
462config ARCH_HAS_HOLES_MEMORYMODEL
463 def_bool y if SPARSEMEM
464
465config ARCH_SPARSEMEM_ENABLE
466 def_bool y
467 select SPARSEMEM_VMEMMAP_ENABLE
468
469config ARCH_SPARSEMEM_DEFAULT
470 def_bool ARCH_SPARSEMEM_ENABLE
471
472config ARCH_SELECT_MEMORY_MODEL
473 def_bool ARCH_SPARSEMEM_ENABLE
474
475config HAVE_ARCH_PFN_VALID
476 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
477
478config HW_PERF_EVENTS
Mark Rutland6475b2d2015-10-02 10:55:03 +0100479 def_bool y
480 depends on ARM_PMU
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100481
Steve Capper084bd292013-04-10 13:48:00 +0100482config SYS_SUPPORTS_HUGETLBFS
483 def_bool y
484
485config ARCH_WANT_GENERAL_HUGETLB
486 def_bool y
487
488config ARCH_WANT_HUGE_PMD_SHARE
Suzuki K. Poulose21539932015-10-19 14:19:38 +0100489 def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36)
Steve Capper084bd292013-04-10 13:48:00 +0100490
Steve Capperaf074842013-04-19 16:23:57 +0100491config HAVE_ARCH_TRANSPARENT_HUGEPAGE
492 def_bool y
493
Catalin Marinasa41dc0e2014-04-03 17:48:54 +0100494config ARCH_HAS_CACHE_LINE_SIZE
495 def_bool y
496
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100497source "mm/Kconfig"
498
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +0000499config SECCOMP
500 bool "Enable seccomp to safely compute untrusted bytecode"
501 ---help---
502 This kernel feature is useful for number crunching applications
503 that may need to compute untrusted bytecode during their
504 execution. By using pipes or other transports made available to
505 the process as file descriptors supporting the read/write
506 syscalls, it's possible to isolate those applications in
507 their own address space using seccomp. Once seccomp is
508 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
509 and the task is only allowed to execute a few safe syscalls
510 defined by each seccomp mode.
511
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000512config XEN_DOM0
513 def_bool y
514 depends on XEN
515
516config XEN
Julien Grallc2ba1f72014-09-17 14:07:06 -0700517 bool "Xen guest support on ARM64"
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000518 depends on ARM64 && OF
Stefano Stabellini83862cc2013-10-10 13:40:44 +0000519 select SWIOTLB_XEN
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000520 help
521 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
522
Steve Capperd03bb142013-04-25 15:19:21 +0100523config FORCE_MAX_ZONEORDER
524 int
525 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100526 default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE)
Steve Capperd03bb142013-04-25 15:19:21 +0100527 default "11"
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100528 help
529 The kernel memory allocator divides physically contiguous memory
530 blocks into "zones", where each zone is a power of two number of
531 pages. This option selects the largest power of two that the kernel
532 keeps in the memory allocator. If you need to allocate very large
533 blocks of physically contiguous memory, then you may need to
534 increase this value.
535
536 This config option is actually maximum order plus one. For example,
537 a value of 11 means that the largest free memory block is 2^10 pages.
538
539 We make sure that we can allocate upto a HugePage size for each configuration.
540 Hence we have :
541 MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2
542
543 However for 4K, we choose a higher default value, 11 as opposed to 10, giving us
544 4M allocations matching the default size used by generic code.
Steve Capperd03bb142013-04-25 15:19:21 +0100545
Will Deacon1b907f42014-11-20 16:51:10 +0000546menuconfig ARMV8_DEPRECATED
547 bool "Emulate deprecated/obsolete ARMv8 instructions"
548 depends on COMPAT
549 help
550 Legacy software support may require certain instructions
551 that have been deprecated or obsoleted in the architecture.
552
553 Enable this config to enable selective emulation of these
554 features.
555
556 If unsure, say Y
557
558if ARMV8_DEPRECATED
559
560config SWP_EMULATION
561 bool "Emulate SWP/SWPB instructions"
562 help
563 ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
564 they are always undefined. Say Y here to enable software
565 emulation of these instructions for userspace using LDXR/STXR.
566
567 In some older versions of glibc [<=2.8] SWP is used during futex
568 trylock() operations with the assumption that the code will not
569 be preempted. This invalid assumption may be more likely to fail
570 with SWP emulation enabled, leading to deadlock of the user
571 application.
572
573 NOTE: when accessing uncached shared regions, LDXR/STXR rely
574 on an external transaction monitoring block called a global
575 monitor to maintain update atomicity. If your system does not
576 implement a global monitor, this option can cause programs that
577 perform SWP operations to uncached memory to deadlock.
578
579 If unsure, say Y
580
581config CP15_BARRIER_EMULATION
582 bool "Emulate CP15 Barrier instructions"
583 help
584 The CP15 barrier instructions - CP15ISB, CP15DSB, and
585 CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
586 strongly recommended to use the ISB, DSB, and DMB
587 instructions instead.
588
589 Say Y here to enable software emulation of these
590 instructions for AArch32 userspace code. When this option is
591 enabled, CP15 barrier usage is traced which can help
592 identify software that needs updating.
593
594 If unsure, say Y
595
Suzuki K. Poulose2d888f42015-01-21 12:43:11 +0000596config SETEND_EMULATION
597 bool "Emulate SETEND instruction"
598 help
599 The SETEND instruction alters the data-endianness of the
600 AArch32 EL0, and is deprecated in ARMv8.
601
602 Say Y here to enable software emulation of the instruction
603 for AArch32 userspace code.
604
605 Note: All the cpus on the system must have mixed endian support at EL0
606 for this feature to be enabled. If a new CPU - which doesn't support mixed
607 endian - is hotplugged in after this feature has been enabled, there could
608 be unexpected results in the applications.
609
610 If unsure, say Y
Will Deacon1b907f42014-11-20 16:51:10 +0000611endif
612
Will Deacon0e4a0702015-07-27 15:54:13 +0100613menu "ARMv8.1 architectural features"
614
615config ARM64_HW_AFDBM
616 bool "Support for hardware updates of the Access and Dirty page flags"
617 default y
618 help
619 The ARMv8.1 architecture extensions introduce support for
620 hardware updates of the access and dirty information in page
621 table entries. When enabled in TCR_EL1 (HA and HD bits) on
622 capable processors, accesses to pages with PTE_AF cleared will
623 set this bit instead of raising an access flag fault.
624 Similarly, writes to read-only pages with the DBM bit set will
625 clear the read-only bit (AP[2]) instead of raising a
626 permission fault.
627
628 Kernels built with this configuration option enabled continue
629 to work on pre-ARMv8.1 hardware and the performance impact is
630 minimal. If unsure, say Y.
631
632config ARM64_PAN
633 bool "Enable support for Privileged Access Never (PAN)"
634 default y
635 help
636 Privileged Access Never (PAN; part of the ARMv8.1 Extensions)
637 prevents the kernel or hypervisor from accessing user-space (EL0)
638 memory directly.
639
640 Choosing this option will cause any unprotected (not using
641 copy_to_user et al) memory access to fail with a permission fault.
642
643 The feature is detected at runtime, and will remain as a 'nop'
644 instruction if the cpu does not implement the feature.
645
646config ARM64_LSE_ATOMICS
647 bool "Atomic instructions"
648 help
649 As part of the Large System Extensions, ARMv8.1 introduces new
650 atomic instructions that are designed specifically to scale in
651 very large systems.
652
653 Say Y here to make use of these instructions for the in-kernel
654 atomic routines. This incurs a small overhead on CPUs that do
655 not support these instructions and requires the kernel to be
656 built with binutils >= 2.25.
657
658endmenu
659
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100660endmenu
661
662menu "Boot options"
663
664config CMDLINE
665 string "Default kernel command string"
666 default ""
667 help
668 Provide a set of default command-line options at build time by
669 entering them here. As a minimum, you should specify the the
670 root device (e.g. root=/dev/nfs).
671
672config CMDLINE_FORCE
673 bool "Always use the default kernel command string"
674 help
675 Always use the default kernel command string, even if the boot
676 loader passes other arguments to the kernel.
677 This is useful if you cannot or don't want to change the
678 command-line options your boot loader passes to the kernel.
679
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200680config EFI_STUB
681 bool
682
Mark Salterf84d0272014-04-15 21:59:30 -0400683config EFI
684 bool "UEFI runtime support"
685 depends on OF && !CPU_BIG_ENDIAN
686 select LIBFDT
687 select UCS2_STRING
688 select EFI_PARAMS_FROM_FDT
Ard Biesheuvele15dd492014-07-04 19:41:53 +0200689 select EFI_RUNTIME_WRAPPERS
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200690 select EFI_STUB
691 select EFI_ARMSTUB
Mark Salterf84d0272014-04-15 21:59:30 -0400692 default y
693 help
694 This option provides support for runtime services provided
695 by UEFI firmware (such as non-volatile variables, realtime
Mark Salter3c7f2552014-04-15 22:47:52 -0400696 clock, and platform reset). A UEFI stub is also provided to
697 allow the kernel to be booted as an EFI application. This
698 is only useful on systems that have UEFI firmware.
Mark Salterf84d0272014-04-15 21:59:30 -0400699
Yi Lid1ae8c02014-10-04 23:46:43 +0800700config DMI
701 bool "Enable support for SMBIOS (DMI) tables"
702 depends on EFI
703 default y
704 help
705 This enables SMBIOS/DMI feature for systems.
706
707 This option is only useful on systems that have UEFI firmware.
708 However, even with this option, the resultant kernel should
709 continue to boot on existing non-UEFI platforms.
710
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100711endmenu
712
713menu "Userspace binary formats"
714
715source "fs/Kconfig.binfmt"
716
717config COMPAT
718 bool "Kernel support for 32-bit EL0"
Suzuki K. Poulose755e70b2015-10-19 14:19:32 +0100719 depends on ARM64_4K_PAGES || EXPERT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100720 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -0700721 select HAVE_UID16
Al Viro84b9e9b2012-12-25 16:29:11 -0500722 select OLD_SIGSUSPEND3
Al Viro51682032012-12-25 19:31:29 -0500723 select COMPAT_OLD_SIGACTION
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100724 help
725 This option enables support for a 32-bit EL0 running under a 64-bit
726 kernel at EL1. AArch32-specific components such as system calls,
727 the user helper functions, VFP support and the ptrace interface are
728 handled appropriately by the kernel.
729
Suzuki K. Poulose44eaacf2015-10-19 14:19:37 +0100730 If you use a page size other than 4KB (i.e, 16KB or 64KB), please be aware
731 that you will only be able to execute AArch32 binaries that were compiled
732 with page size aligned segments.
Alexander Grafa8fcd8b2015-03-16 16:32:23 +0000733
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100734 If you want to execute 32-bit userspace applications, say Y.
735
736config SYSVIPC_COMPAT
737 def_bool y
738 depends on COMPAT && SYSVIPC
739
740endmenu
741
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000742menu "Power management options"
743
744source "kernel/power/Kconfig"
745
746config ARCH_SUSPEND_POSSIBLE
747 def_bool y
748
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000749endmenu
750
Lorenzo Pieralisi13072202013-07-17 14:54:21 +0100751menu "CPU Power Management"
752
753source "drivers/cpuidle/Kconfig"
754
Rob Herring52e7e812014-02-24 11:27:57 +0900755source "drivers/cpufreq/Kconfig"
756
757endmenu
758
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100759source "net/Kconfig"
760
761source "drivers/Kconfig"
762
Mark Salterf84d0272014-04-15 21:59:30 -0400763source "drivers/firmware/Kconfig"
764
Graeme Gregoryb6a02172015-03-24 14:02:53 +0000765source "drivers/acpi/Kconfig"
766
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100767source "fs/Kconfig"
768
Marc Zyngierc3eb5b12013-07-04 13:34:32 +0100769source "arch/arm64/kvm/Kconfig"
770
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100771source "arch/arm64/Kconfig.debug"
772
773source "security/Kconfig"
774
775source "crypto/Kconfig"
Ard Biesheuvel2c988332014-03-06 16:23:33 +0800776if CRYPTO
777source "arch/arm64/crypto/Kconfig"
778endif
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100779
780source "lib/Kconfig"