blob: de8dee60fd825ede80d7799c514401ca2f337489 [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
Will Deaconadace892013-05-08 17:29:24 +010023 select BUILDTIME_EXTABLE_SORT
Catalin Marinasdb2789b2012-12-18 15:27:25 +000024 select CLONE_BACKWARDS
Deepak Saxena7ca2ef32012-09-22 10:33:36 -070025 select COMMON_CLK
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +000026 select CPU_PM if (SUSPEND || CPU_IDLE)
Will Deacon7bc13fd2013-11-06 19:32:13 +000027 select DCACHE_WORD_ACCESS
Catalin Marinasef375662015-07-07 17:15:39 +010028 select EDAC_SUPPORT
Laura Abbottd4932f92014-10-09 15:26:44 -070029 select GENERIC_ALLOCATOR
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010030 select GENERIC_CLOCKEVENTS
Will Deacon4b3dc962015-05-29 18:28:44 +010031 select GENERIC_CLOCKEVENTS_BROADCAST
Ard Biesheuvel3be1a5c2014-03-04 01:10:04 +000032 select GENERIC_CPU_AUTOPROBE
Mark Salterbf4b5582014-04-07 15:39:52 -070033 select GENERIC_EARLY_IOREMAP
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010034 select GENERIC_IRQ_PROBE
35 select GENERIC_IRQ_SHOW
Sudeep Holla6544e672015-04-22 18:16:33 +010036 select GENERIC_IRQ_SHOW_LEVEL
Arnd Bergmanncb61f672014-11-19 14:09:07 +010037 select GENERIC_PCI_IOMAP
Stephen Boyd65cd4f62013-07-18 16:21:18 -070038 select GENERIC_SCHED_CLOCK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010039 select GENERIC_SMP_IDLE_THREAD
Will Deacon12a0ef72013-11-06 17:20:22 +000040 select GENERIC_STRNCPY_FROM_USER
41 select GENERIC_STRNLEN_USER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010042 select GENERIC_TIME_VSYSCALL
Marc Zyngiera1ddc742014-08-26 11:03:17 +010043 select HANDLE_DOMAIN_IRQ
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010044 select HARDIRQS_SW_RESEND
Steve Capper5284e1b2014-10-24 13:22:20 +010045 select HAVE_ALIGNED_STRUCT_PAGE if SLUB
AKASHI Takahiro875cbf32014-07-04 08:28:30 +010046 select HAVE_ARCH_AUDITSYSCALL
Yalin Wang8e7a4ce2014-11-03 03:02:23 +010047 select HAVE_ARCH_BITREVERSE
Jiang Liu9732caf2014-01-07 22:17:13 +080048 select HAVE_ARCH_JUMP_LABEL
Vijaya Kumar K95292472014-01-28 11:20:22 +000049 select HAVE_ARCH_KGDB
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +000050 select HAVE_ARCH_SECCOMP_FILTER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010051 select HAVE_ARCH_TRACEHOOK
Zi Shen Lime54bcde2014-08-26 21:15:30 -070052 select HAVE_BPF_JIT
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010053 select HAVE_C_RECORDMCOUNT
Laura Abbottc0c264a2014-06-25 23:55:03 +010054 select HAVE_CC_STACKPROTECTOR
Steve Capper5284e1b2014-10-24 13:22:20 +010055 select HAVE_CMPXCHG_DOUBLE
Catalin Marinas9b2a60c2012-10-08 16:28:13 -070056 select HAVE_DEBUG_BUGVERBOSE
Catalin Marinasb69ec422012-10-08 16:28:11 -070057 select HAVE_DEBUG_KMEMLEAK
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010058 select HAVE_DMA_API_DEBUG
59 select HAVE_DMA_ATTRS
Laura Abbott6ac21042013-12-12 19:28:33 +000060 select HAVE_DMA_CONTIGUOUS
AKASHI Takahirobd7d38d2014-04-30 10:54:34 +010061 select HAVE_DYNAMIC_FTRACE
Will Deacon50afc332013-12-16 17:50:08 +000062 select HAVE_EFFICIENT_UNALIGNED_ACCESS
AKASHI Takahiroaf64d2a2014-04-30 10:54:32 +010063 select HAVE_FTRACE_MCOUNT_RECORD
AKASHI Takahiro819e50e2014-04-30 18:54:33 +090064 select HAVE_FUNCTION_TRACER
65 select HAVE_FUNCTION_GRAPH_TRACER
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010066 select HAVE_GENERIC_DMA_COHERENT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010067 select HAVE_HW_BREAKPOINT if PERF_EVENTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010068 select HAVE_MEMBLOCK
Mark Rutland55834a72014-02-07 17:12:45 +000069 select HAVE_PATA_PLATFORM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010070 select HAVE_PERF_EVENTS
Jean Pihet2ee0d7f2014-02-03 19:18:27 +010071 select HAVE_PERF_REGS
72 select HAVE_PERF_USER_STACK_DUMP
Steve Capper5e5f6dc2014-10-09 15:29:23 -070073 select HAVE_RCU_TABLE_FREE
AKASHI Takahiro055b1212014-04-30 10:54:36 +010074 select HAVE_SYSCALL_TRACEPOINTS
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010075 select IRQ_DOMAIN
Anders Roxelle8557d12015-04-27 22:53:09 +020076 select IRQ_FORCED_THREADING
Catalin Marinasfea2aca2012-10-16 11:26:57 +010077 select MODULES_USE_ELF_RELA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010078 select NO_BOOTMEM
79 select OF
80 select OF_EARLY_FLATTREE
Marek Szyprowski9bf14b72014-02-28 14:42:55 +010081 select OF_RESERVED_MEM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010082 select PERF_USE_VMALLOC
Catalin Marinasaa1e8ec2013-02-28 18:14:37 +000083 select POWER_RESET
84 select POWER_SUPPLY
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010085 select RTC_LIB
86 select SPARSE_IRQ
Catalin Marinas7ac57a82012-10-08 16:28:16 -070087 select SYSCTL_EXCEPTION_TRACE
Larry Bassel6c81fe72014-05-30 12:34:15 -070088 select HAVE_CONTEXT_TRACKING
Catalin Marinas8c2c3df2012-04-20 14:45:54 +010089 help
90 ARM 64-bit (AArch64) Linux support.
91
92config 64BIT
93 def_bool y
94
95config ARCH_PHYS_ADDR_T_64BIT
96 def_bool y
97
98config MMU
99 def_bool y
100
Uwe Kleine-Königce816fa2014-04-07 15:39:19 -0700101config NO_IOPORT_MAP
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100102 def_bool y if !PCI
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100103
104config STACKTRACE_SUPPORT
105 def_bool y
106
107config LOCKDEP_SUPPORT
108 def_bool y
109
110config TRACE_IRQFLAGS_SUPPORT
111 def_bool y
112
Will Deaconc209f792014-03-14 17:47:05 +0000113config RWSEM_XCHGADD_ALGORITHM
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100114 def_bool y
115
116config GENERIC_HWEIGHT
117 def_bool y
118
119config GENERIC_CSUM
120 def_bool y
121
122config GENERIC_CALIBRATE_DELAY
123 def_bool y
124
Catalin Marinas19e76402014-02-27 12:09:22 +0000125config ZONE_DMA
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100126 def_bool y
127
Steve Capper29e56942014-10-09 15:29:25 -0700128config HAVE_GENERIC_RCU_GUP
129 def_bool y
130
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100131config ARCH_DMA_ADDR_T_64BIT
132 def_bool y
133
134config NEED_DMA_MAP_STATE
135 def_bool y
136
137config NEED_SG_DMA_LENGTH
138 def_bool y
139
Will Deacon4b3dc962015-05-29 18:28:44 +0100140config SMP
141 def_bool y
142
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100143config SWIOTLB
144 def_bool y
145
146config IOMMU_HELPER
147 def_bool SWIOTLB
148
Ard Biesheuvel4cfb3612013-07-09 14:18:12 +0100149config KERNEL_MODE_NEON
150 def_bool y
151
Rob Herring92cc15f2014-04-18 17:19:59 -0500152config FIX_EARLYCON_MEM
153 def_bool y
154
Kirill A. Shutemov9f25e6a2015-04-14 15:45:39 -0700155config PGTABLE_LEVELS
156 int
157 default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42
158 default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48
159 default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39
160 default 4 if ARM64_4K_PAGES && ARM64_VA_BITS_48
161
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100162source "init/Kconfig"
163
164source "kernel/Kconfig.freezer"
165
Catalin Marinas1ae90e72012-09-05 17:47:44 +0100166menu "Platform selection"
167
Alim Akhtar6f56eef2014-11-22 22:41:52 +0900168config ARCH_EXYNOS
169 bool
170 help
171 This enables support for Samsung Exynos SoC family
172
173config ARCH_EXYNOS7
174 bool "ARMv8 based Samsung Exynos7"
175 select ARCH_EXYNOS
176 select COMMON_CLK_SAMSUNG
177 select HAVE_S3C2410_WATCHDOG if WATCHDOG
178 select HAVE_S3C_RTC if RTC_CLASS
179 select PINCTRL
180 select PINCTRL_EXYNOS
181
182 help
183 This enables support for Samsung Exynos7 SoC family
184
Olof Johansson5118a6a2015-01-27 16:19:11 -0800185config ARCH_FSL_LS2085A
186 bool "Freescale LS2085A SOC"
187 help
188 This enables support for Freescale LS2085A SOC.
189
Bintian Wang85fe9462015-01-06 09:30:36 +0800190config ARCH_HISI
191 bool "Hisilicon SoC Family"
192 help
193 This enables support for Hisilicon ARMv8 SoC family
194
Eddie Huang4727a6f2015-12-01 10:14:00 +0100195config ARCH_MEDIATEK
196 bool "Mediatek MT65xx & MT81xx ARMv8 SoC"
197 select ARM_GIC
Yingjoe Chen0a233cd2015-03-06 14:24:50 +0800198 select PINCTRL
Eddie Huang4727a6f2015-12-01 10:14:00 +0100199 help
200 Support for Mediatek MT65xx & MT81xx ARMv8 SoCs
201
Abhimanyu Kapurd7f64a42013-10-15 21:11:09 -0700202config ARCH_QCOM
203 bool "Qualcomm Platforms"
204 select PINCTRL
205 help
206 This enables support for the ARMv8 based Qualcomm chipsets.
207
Suravee Suthikulpanit41904362014-11-26 11:51:09 +0700208config ARCH_SEATTLE
209 bool "AMD Seattle SoC Family"
210 help
211 This enables support for AMD Seattle SOC Family
212
Paul Walmsleyd035fdf2015-01-07 01:17:33 -0700213config ARCH_TEGRA
214 bool "NVIDIA Tegra SoC Family"
215 select ARCH_HAS_RESET_CONTROLLER
216 select ARCH_REQUIRE_GPIOLIB
217 select CLKDEV_LOOKUP
218 select CLKSRC_MMIO
219 select CLKSRC_OF
220 select GENERIC_CLOCKEVENTS
221 select HAVE_CLK
Paul Walmsleyd035fdf2015-01-07 01:17:33 -0700222 select PINCTRL
223 select RESET_CONTROLLER
224 help
225 This enables support for the NVIDIA Tegra SoC family.
226
227config ARCH_TEGRA_132_SOC
228 bool "NVIDIA Tegra132 SoC"
229 depends on ARCH_TEGRA
230 select PINCTRL_TEGRA124
Paul Walmsleyd035fdf2015-01-07 01:17:33 -0700231 select USB_ULPI if USB_PHY
232 select USB_ULPI_VIEWPORT if USB_PHY
233 help
234 Enable support for NVIDIA Tegra132 SoC, based on the Denver
235 ARMv8 CPU. The Tegra132 SoC is similar to the Tegra124 SoC,
236 but contains an NVIDIA Denver CPU complex in place of
237 Tegra124's "4+1" Cortex-A15 CPU complex.
238
Zhizhou Zhangc4bb7992015-03-11 02:27:08 +0000239config ARCH_SPRD
240 bool "Spreadtrum SoC platform"
241 help
242 Support for Spreadtrum ARM based SoCs
243
Radha Mohan Chintakuntla28f74202014-04-08 18:47:51 +0530244config ARCH_THUNDER
245 bool "Cavium Inc. Thunder SoC Family"
246 help
247 This enables support for Cavium's Thunder Family of SoCs.
248
Catalin Marinas1ae90e72012-09-05 17:47:44 +0100249config ARCH_VEXPRESS
250 bool "ARMv8 software model (Versatile Express)"
251 select ARCH_REQUIRE_GPIOLIB
252 select COMMON_CLK_VERSATILE
Catalin Marinasaa1e8ec2013-02-28 18:14:37 +0000253 select POWER_RESET_VEXPRESS
Catalin Marinas1ae90e72012-09-05 17:47:44 +0100254 select VEXPRESS_CONFIG
255 help
256 This enables support for the ARMv8 software model (Versatile
257 Express).
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100258
Vinayak Kale15942852013-04-24 10:06:57 +0100259config ARCH_XGENE
260 bool "AppliedMicro X-Gene SOC Family"
261 help
262 This enables support for AppliedMicro X-Gene SOC Family
263
Michal Simek5d1b79d2015-03-09 09:41:04 +0100264config ARCH_ZYNQMP
265 bool "Xilinx ZynqMP Family"
266 help
267 This enables support for Xilinx ZynqMP Family
268
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100269endmenu
270
271menu "Bus support"
272
Liviu Dudaud1e6dc92014-09-29 15:29:31 +0100273config PCI
274 bool "PCI support"
275 help
276 This feature enables support for PCI bus system. If you say Y
277 here, the kernel will include drivers and infrastructure code
278 to support PCI bus devices.
279
280config PCI_DOMAINS
281 def_bool PCI
282
283config PCI_DOMAINS_GENERIC
284 def_bool PCI
285
286config PCI_SYSCALL
287 def_bool PCI
288
289source "drivers/pci/Kconfig"
290source "drivers/pci/pcie/Kconfig"
291source "drivers/pci/hotplug/Kconfig"
292
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100293endmenu
294
295menu "Kernel Features"
296
Andre Przywarac0a01b82014-11-14 15:54:12 +0000297menu "ARM errata workarounds via the alternatives framework"
298
299config ARM64_ERRATUM_826319
300 bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted"
301 default y
302 help
303 This option adds an alternative code sequence to work around ARM
304 erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or
305 AXI master interface and an L2 cache.
306
307 If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors
308 and is unable to accept a certain write via this interface, it will
309 not progress on read data presented on the read data channel and the
310 system can deadlock.
311
312 The workaround promotes data cache clean instructions to
313 data cache clean-and-invalidate.
314 Please note that this does not necessarily enable the workaround,
315 as it depends on the alternative framework, which will only patch
316 the kernel if an affected CPU is detected.
317
318 If unsure, say Y.
319
320config ARM64_ERRATUM_827319
321 bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect"
322 default y
323 help
324 This option adds an alternative code sequence to work around ARM
325 erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI
326 master interface and an L2 cache.
327
328 Under certain conditions this erratum can cause a clean line eviction
329 to occur at the same time as another transaction to the same address
330 on the AMBA 5 CHI interface, which can cause data corruption if the
331 interconnect reorders the two transactions.
332
333 The workaround promotes data cache clean instructions to
334 data cache clean-and-invalidate.
335 Please note that this does not necessarily enable the workaround,
336 as it depends on the alternative framework, which will only patch
337 the kernel if an affected CPU is detected.
338
339 If unsure, say Y.
340
341config ARM64_ERRATUM_824069
342 bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop"
343 default y
344 help
345 This option adds an alternative code sequence to work around ARM
346 erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected
347 to a coherent interconnect.
348
349 If a Cortex-A53 processor is executing a store or prefetch for
350 write instruction at the same time as a processor in another
351 cluster is executing a cache maintenance operation to the same
352 address, then this erratum might cause a clean cache line to be
353 incorrectly marked as dirty.
354
355 The workaround promotes data cache clean instructions to
356 data cache clean-and-invalidate.
357 Please note that this option does not necessarily enable the
358 workaround, as it depends on the alternative framework, which will
359 only patch the kernel if an affected CPU is detected.
360
361 If unsure, say Y.
362
363config ARM64_ERRATUM_819472
364 bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption"
365 default y
366 help
367 This option adds an alternative code sequence to work around ARM
368 erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache
369 present when it is connected to a coherent interconnect.
370
371 If the processor is executing a load and store exclusive sequence at
372 the same time as a processor in another cluster is executing a cache
373 maintenance operation to the same address, then this erratum might
374 cause data corruption.
375
376 The workaround promotes data cache clean instructions to
377 data cache clean-and-invalidate.
378 Please note that this does not necessarily enable the workaround,
379 as it depends on the alternative framework, which will only patch
380 the kernel if an affected CPU is detected.
381
382 If unsure, say Y.
383
384config ARM64_ERRATUM_832075
385 bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads"
386 default y
387 help
388 This option adds an alternative code sequence to work around ARM
389 erratum 832075 on Cortex-A57 parts up to r1p2.
390
391 Affected Cortex-A57 parts might deadlock when exclusive load/store
392 instructions to Write-Back memory are mixed with Device loads.
393
394 The workaround is to promote device loads to use Load-Acquire
395 semantics.
396 Please note that this does not necessarily enable the workaround,
397 as it depends on the alternative framework, which will only patch
398 the kernel if an affected CPU is detected.
399
400 If unsure, say Y.
401
Will Deacon905e8c52015-03-23 19:07:02 +0000402config ARM64_ERRATUM_845719
403 bool "Cortex-A53: 845719: a load might read incorrect data"
404 depends on COMPAT
405 default y
406 help
407 This option adds an alternative code sequence to work around ARM
408 erratum 845719 on Cortex-A53 parts up to r0p4.
409
410 When running a compat (AArch32) userspace on an affected Cortex-A53
411 part, a load at EL0 from a virtual address that matches the bottom 32
412 bits of the virtual address used by a recent load at (AArch64) EL1
413 might return incorrect data.
414
415 The workaround is to write the contextidr_el1 register on exception
416 return to a 32-bit task.
417 Please note that this does not necessarily enable the workaround,
418 as it depends on the alternative framework, which will only patch
419 the kernel if an affected CPU is detected.
420
421 If unsure, say Y.
422
Andre Przywarac0a01b82014-11-14 15:54:12 +0000423endmenu
424
425
Jungseok Leee41ceed2014-05-12 10:40:38 +0100426choice
427 prompt "Page size"
428 default ARM64_4K_PAGES
429 help
430 Page size (translation granule) configuration.
431
432config ARM64_4K_PAGES
433 bool "4KB"
434 help
435 This feature enables 4KB pages support.
436
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100437config ARM64_64K_PAGES
Jungseok Leee41ceed2014-05-12 10:40:38 +0100438 bool "64KB"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100439 help
440 This feature enables 64KB pages support (4KB by default)
441 allowing only two levels of page tables and faster TLB
442 look-up. AArch32 emulation is not available when this feature
443 is enabled.
444
Jungseok Leee41ceed2014-05-12 10:40:38 +0100445endchoice
446
447choice
448 prompt "Virtual address space size"
449 default ARM64_VA_BITS_39 if ARM64_4K_PAGES
450 default ARM64_VA_BITS_42 if ARM64_64K_PAGES
451 help
452 Allows choosing one of multiple possible virtual address
453 space sizes. The level of translation table is determined by
454 a combination of page size and virtual address space size.
455
456config ARM64_VA_BITS_39
457 bool "39-bit"
458 depends on ARM64_4K_PAGES
459
460config ARM64_VA_BITS_42
461 bool "42-bit"
462 depends on ARM64_64K_PAGES
463
Jungseok Leec79b9542014-05-12 18:40:51 +0900464config ARM64_VA_BITS_48
465 bool "48-bit"
Jungseok Leec79b9542014-05-12 18:40:51 +0900466
Jungseok Leee41ceed2014-05-12 10:40:38 +0100467endchoice
468
469config ARM64_VA_BITS
470 int
471 default 39 if ARM64_VA_BITS_39
472 default 42 if ARM64_VA_BITS_42
Jungseok Leec79b9542014-05-12 18:40:51 +0900473 default 48 if ARM64_VA_BITS_48
Jungseok Leee41ceed2014-05-12 10:40:38 +0100474
Catalin Marinas2f4b8292015-07-10 17:24:28 +0100475config ARM64_HW_AFDBM
476 bool "Support for hardware updates of the Access and Dirty page flags"
477 default y
478 help
479 The ARMv8.1 architecture extensions introduce support for
480 hardware updates of the access and dirty information in page
481 table entries. When enabled in TCR_EL1 (HA and HD bits) on
482 capable processors, accesses to pages with PTE_AF cleared will
483 set this bit instead of raising an access flag fault.
484 Similarly, writes to read-only pages with the DBM bit set will
485 clear the read-only bit (AP[2]) instead of raising a
486 permission fault.
487
488 Kernels built with this configuration option enabled continue
489 to work on pre-ARMv8.1 hardware and the performance impact is
490 minimal. If unsure, say Y.
491
Will Deacona8720132013-10-11 14:52:19 +0100492config CPU_BIG_ENDIAN
493 bool "Build big-endian kernel"
494 help
495 Say Y if you plan on running a kernel in big-endian mode.
496
Mark Brownf6e763b2014-03-04 07:51:17 +0000497config SCHED_MC
498 bool "Multi-core scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000499 help
500 Multi-core scheduler support improves the CPU scheduler's decision
501 making when dealing with multi-core CPU chips at a cost of slightly
502 increased overhead in some places. If unsure say N here.
503
504config SCHED_SMT
505 bool "SMT scheduler support"
Mark Brownf6e763b2014-03-04 07:51:17 +0000506 help
507 Improves the CPU scheduler's decision making when dealing with
508 MultiThreading at a cost of slightly increased overhead in some
509 places. If unsure say N here.
510
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100511config NR_CPUS
Ganapatrao Kulkarni62aa9652015-03-18 11:01:18 +0000512 int "Maximum number of CPUs (2-4096)"
513 range 2 4096
Vinayak Kale15942852013-04-24 10:06:57 +0100514 # These have to remain sorted largest to smallest
Robert Richtere3672642014-09-08 12:44:48 +0100515 default "64"
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100516
Mark Rutland9327e2c2013-10-24 20:30:18 +0100517config HOTPLUG_CPU
518 bool "Support for hot-pluggable CPUs"
Mark Rutland9327e2c2013-10-24 20:30:18 +0100519 help
520 Say Y here to experiment with turning CPUs off and on. CPUs
521 can be controlled through /sys/devices/system/cpu.
522
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100523source kernel/Kconfig.preempt
524
525config HZ
526 int
527 default 100
528
529config ARCH_HAS_HOLES_MEMORYMODEL
530 def_bool y if SPARSEMEM
531
532config ARCH_SPARSEMEM_ENABLE
533 def_bool y
534 select SPARSEMEM_VMEMMAP_ENABLE
535
536config ARCH_SPARSEMEM_DEFAULT
537 def_bool ARCH_SPARSEMEM_ENABLE
538
539config ARCH_SELECT_MEMORY_MODEL
540 def_bool ARCH_SPARSEMEM_ENABLE
541
542config HAVE_ARCH_PFN_VALID
543 def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM
544
545config HW_PERF_EVENTS
546 bool "Enable hardware performance counter support for perf events"
547 depends on PERF_EVENTS
548 default y
549 help
550 Enable hardware performance counter support for perf events. If
551 disabled, perf events will use software events only.
552
Steve Capper084bd292013-04-10 13:48:00 +0100553config SYS_SUPPORTS_HUGETLBFS
554 def_bool y
555
556config ARCH_WANT_GENERAL_HUGETLB
557 def_bool y
558
559config ARCH_WANT_HUGE_PMD_SHARE
560 def_bool y if !ARM64_64K_PAGES
561
Steve Capperaf074842013-04-19 16:23:57 +0100562config HAVE_ARCH_TRANSPARENT_HUGEPAGE
563 def_bool y
564
Catalin Marinasa41dc0e2014-04-03 17:48:54 +0100565config ARCH_HAS_CACHE_LINE_SIZE
566 def_bool y
567
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100568source "mm/Kconfig"
569
AKASHI Takahiroa1ae65b2014-11-28 05:26:39 +0000570config SECCOMP
571 bool "Enable seccomp to safely compute untrusted bytecode"
572 ---help---
573 This kernel feature is useful for number crunching applications
574 that may need to compute untrusted bytecode during their
575 execution. By using pipes or other transports made available to
576 the process as file descriptors supporting the read/write
577 syscalls, it's possible to isolate those applications in
578 their own address space using seccomp. Once seccomp is
579 enabled via prctl(PR_SET_SECCOMP), it cannot be disabled
580 and the task is only allowed to execute a few safe syscalls
581 defined by each seccomp mode.
582
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000583config XEN_DOM0
584 def_bool y
585 depends on XEN
586
587config XEN
Julien Grallc2ba1f72014-09-17 14:07:06 -0700588 bool "Xen guest support on ARM64"
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000589 depends on ARM64 && OF
Stefano Stabellini83862cc2013-10-10 13:40:44 +0000590 select SWIOTLB_XEN
Stefano Stabelliniaa42aa12013-06-03 17:05:43 +0000591 help
592 Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64.
593
Steve Capperd03bb142013-04-25 15:19:21 +0100594config FORCE_MAX_ZONEORDER
595 int
596 default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE)
597 default "11"
598
Will Deacon1b907f42014-11-20 16:51:10 +0000599menuconfig ARMV8_DEPRECATED
600 bool "Emulate deprecated/obsolete ARMv8 instructions"
601 depends on COMPAT
602 help
603 Legacy software support may require certain instructions
604 that have been deprecated or obsoleted in the architecture.
605
606 Enable this config to enable selective emulation of these
607 features.
608
609 If unsure, say Y
610
611if ARMV8_DEPRECATED
612
613config SWP_EMULATION
614 bool "Emulate SWP/SWPB instructions"
615 help
616 ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that
617 they are always undefined. Say Y here to enable software
618 emulation of these instructions for userspace using LDXR/STXR.
619
620 In some older versions of glibc [<=2.8] SWP is used during futex
621 trylock() operations with the assumption that the code will not
622 be preempted. This invalid assumption may be more likely to fail
623 with SWP emulation enabled, leading to deadlock of the user
624 application.
625
626 NOTE: when accessing uncached shared regions, LDXR/STXR rely
627 on an external transaction monitoring block called a global
628 monitor to maintain update atomicity. If your system does not
629 implement a global monitor, this option can cause programs that
630 perform SWP operations to uncached memory to deadlock.
631
632 If unsure, say Y
633
634config CP15_BARRIER_EMULATION
635 bool "Emulate CP15 Barrier instructions"
636 help
637 The CP15 barrier instructions - CP15ISB, CP15DSB, and
638 CP15DMB - are deprecated in ARMv8 (and ARMv7). It is
639 strongly recommended to use the ISB, DSB, and DMB
640 instructions instead.
641
642 Say Y here to enable software emulation of these
643 instructions for AArch32 userspace code. When this option is
644 enabled, CP15 barrier usage is traced which can help
645 identify software that needs updating.
646
647 If unsure, say Y
648
Suzuki K. Poulose2d888f42015-01-21 12:43:11 +0000649config SETEND_EMULATION
650 bool "Emulate SETEND instruction"
651 help
652 The SETEND instruction alters the data-endianness of the
653 AArch32 EL0, and is deprecated in ARMv8.
654
655 Say Y here to enable software emulation of the instruction
656 for AArch32 userspace code.
657
658 Note: All the cpus on the system must have mixed endian support at EL0
659 for this feature to be enabled. If a new CPU - which doesn't support mixed
660 endian - is hotplugged in after this feature has been enabled, there could
661 be unexpected results in the applications.
662
663 If unsure, say Y
Will Deacon1b907f42014-11-20 16:51:10 +0000664endif
665
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100666endmenu
667
668menu "Boot options"
669
670config CMDLINE
671 string "Default kernel command string"
672 default ""
673 help
674 Provide a set of default command-line options at build time by
675 entering them here. As a minimum, you should specify the the
676 root device (e.g. root=/dev/nfs).
677
678config CMDLINE_FORCE
679 bool "Always use the default kernel command string"
680 help
681 Always use the default kernel command string, even if the boot
682 loader passes other arguments to the kernel.
683 This is useful if you cannot or don't want to change the
684 command-line options your boot loader passes to the kernel.
685
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200686config EFI_STUB
687 bool
688
Mark Salterf84d0272014-04-15 21:59:30 -0400689config EFI
690 bool "UEFI runtime support"
691 depends on OF && !CPU_BIG_ENDIAN
692 select LIBFDT
693 select UCS2_STRING
694 select EFI_PARAMS_FROM_FDT
Ard Biesheuvele15dd492014-07-04 19:41:53 +0200695 select EFI_RUNTIME_WRAPPERS
Ard Biesheuvelf4f75ad52014-07-02 14:54:43 +0200696 select EFI_STUB
697 select EFI_ARMSTUB
Mark Salterf84d0272014-04-15 21:59:30 -0400698 default y
699 help
700 This option provides support for runtime services provided
701 by UEFI firmware (such as non-volatile variables, realtime
Mark Salter3c7f2552014-04-15 22:47:52 -0400702 clock, and platform reset). A UEFI stub is also provided to
703 allow the kernel to be booted as an EFI application. This
704 is only useful on systems that have UEFI firmware.
Mark Salterf84d0272014-04-15 21:59:30 -0400705
Yi Lid1ae8c02014-10-04 23:46:43 +0800706config DMI
707 bool "Enable support for SMBIOS (DMI) tables"
708 depends on EFI
709 default y
710 help
711 This enables SMBIOS/DMI feature for systems.
712
713 This option is only useful on systems that have UEFI firmware.
714 However, even with this option, the resultant kernel should
715 continue to boot on existing non-UEFI platforms.
716
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100717endmenu
718
719menu "Userspace binary formats"
720
721source "fs/Kconfig.binfmt"
722
723config COMPAT
724 bool "Kernel support for 32-bit EL0"
Alexander Grafa8fcd8b2015-03-16 16:32:23 +0000725 depends on !ARM64_64K_PAGES || EXPERT
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100726 select COMPAT_BINFMT_ELF
Catalin Marinasaf1839e2012-10-08 16:28:08 -0700727 select HAVE_UID16
Al Viro84b9e9b2012-12-25 16:29:11 -0500728 select OLD_SIGSUSPEND3
Al Viro51682032012-12-25 19:31:29 -0500729 select COMPAT_OLD_SIGACTION
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100730 help
731 This option enables support for a 32-bit EL0 running under a 64-bit
732 kernel at EL1. AArch32-specific components such as system calls,
733 the user helper functions, VFP support and the ptrace interface are
734 handled appropriately by the kernel.
735
Alexander Grafa8fcd8b2015-03-16 16:32:23 +0000736 If you also enabled CONFIG_ARM64_64K_PAGES, please be aware that you
737 will only be able to execute AArch32 binaries that were compiled with
738 64k aligned segments.
739
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100740 If you want to execute 32-bit userspace applications, say Y.
741
742config SYSVIPC_COMPAT
743 def_bool y
744 depends on COMPAT && SYSVIPC
745
746endmenu
747
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000748menu "Power management options"
749
750source "kernel/power/Kconfig"
751
752config ARCH_SUSPEND_POSSIBLE
753 def_bool y
754
Lorenzo Pieralisi166936b2013-11-07 18:37:14 +0000755endmenu
756
Lorenzo Pieralisi13072202013-07-17 14:54:21 +0100757menu "CPU Power Management"
758
759source "drivers/cpuidle/Kconfig"
760
Rob Herring52e7e812014-02-24 11:27:57 +0900761source "drivers/cpufreq/Kconfig"
762
763endmenu
764
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100765source "net/Kconfig"
766
767source "drivers/Kconfig"
768
Mark Salterf84d0272014-04-15 21:59:30 -0400769source "drivers/firmware/Kconfig"
770
Graeme Gregoryb6a02172015-03-24 14:02:53 +0000771source "drivers/acpi/Kconfig"
772
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100773source "fs/Kconfig"
774
Marc Zyngierc3eb5b12013-07-04 13:34:32 +0100775source "arch/arm64/kvm/Kconfig"
776
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100777source "arch/arm64/Kconfig.debug"
778
779source "security/Kconfig"
780
781source "crypto/Kconfig"
Ard Biesheuvel2c988332014-03-06 16:23:33 +0800782if CRYPTO
783source "arch/arm64/crypto/Kconfig"
784endif
Catalin Marinas8c2c3df2012-04-20 14:45:54 +0100785
786source "lib/Kconfig"