Commit | Line | Data |
---|---|---|
8c2c3df3 CM |
1 | config ARM64 |
2 | def_bool y | |
b6197b93 | 3 | select ACPI_CCA_REQUIRED if ACPI |
d8f4f161 | 4 | select ACPI_GENERIC_GSI if ACPI |
5f1ae4eb | 5 | select ACPI_GTDT if ACPI |
c6bb8f89 | 6 | select ACPI_IORT if ACPI |
6933de0c | 7 | select ACPI_REDUCED_HARDWARE_ONLY if ACPI |
0cb0786b | 8 | select ACPI_MCFG if ACPI |
888125a7 | 9 | select ACPI_SPCR_TABLE if ACPI |
0ce82232 | 10 | select ACPI_PPTT if ACPI |
1d8f51d4 | 11 | select ARCH_CLOCKSOURCE_DATA |
ec6d06ef | 12 | select ARCH_HAS_DEBUG_VIRTUAL |
21266be9 | 13 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
38b04a74 | 14 | select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI |
2b68f6ca | 15 | select ARCH_HAS_ELF_RANDOMIZE |
e75bef2a | 16 | select ARCH_HAS_FAST_MULTIPLIER |
6974f0c4 | 17 | select ARCH_HAS_FORTIFY_SOURCE |
957e3fac | 18 | select ARCH_HAS_GCOV_PROFILE_ALL |
e1073d1e | 19 | select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA |
5e4c7549 | 20 | select ARCH_HAS_KCOV |
f1e3a12b | 21 | select ARCH_HAS_MEMBARRIER_SYNC_CORE |
3010a5ea | 22 | select ARCH_HAS_PTE_SPECIAL |
d2852a22 | 23 | select ARCH_HAS_SET_MEMORY |
308c09f1 | 24 | select ARCH_HAS_SG_CHAIN |
ad21fc4f LA |
25 | select ARCH_HAS_STRICT_KERNEL_RWX |
26 | select ARCH_HAS_STRICT_MODULE_RWX | |
4378a7d4 | 27 | select ARCH_HAS_SYSCALL_WRAPPER |
1f85008e | 28 | select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST |
396a5d4a | 29 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
087133ac WD |
30 | select ARCH_INLINE_READ_LOCK if !PREEMPT |
31 | select ARCH_INLINE_READ_LOCK_BH if !PREEMPT | |
32 | select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPT | |
33 | select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPT | |
34 | select ARCH_INLINE_READ_UNLOCK if !PREEMPT | |
35 | select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPT | |
36 | select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPT | |
37 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPT | |
38 | select ARCH_INLINE_WRITE_LOCK if !PREEMPT | |
39 | select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPT | |
40 | select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPT | |
41 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPT | |
42 | select ARCH_INLINE_WRITE_UNLOCK if !PREEMPT | |
43 | select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPT | |
44 | select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPT | |
45 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPT | |
5d168964 WD |
46 | select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPT |
47 | select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPT | |
48 | select ARCH_INLINE_SPIN_LOCK if !PREEMPT | |
49 | select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPT | |
50 | select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPT | |
51 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPT | |
52 | select ARCH_INLINE_SPIN_UNLOCK if !PREEMPT | |
53 | select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPT | |
54 | select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPT | |
55 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPT | |
c63c8700 | 56 | select ARCH_USE_CMPXCHG_LOCKREF |
087133ac | 57 | select ARCH_USE_QUEUED_RWLOCKS |
c1109047 | 58 | select ARCH_USE_QUEUED_SPINLOCKS |
c484f256 | 59 | select ARCH_SUPPORTS_MEMORY_FAILURE |
4badad35 | 60 | select ARCH_SUPPORTS_ATOMIC_RMW |
f3a53f7b | 61 | select ARCH_SUPPORTS_INT128 if GCC_VERSION >= 50000 || CC_IS_CLANG |
56166230 | 62 | select ARCH_SUPPORTS_NUMA_BALANCING |
6212a512 | 63 | select ARCH_WANT_COMPAT_IPC_PARSE_VERSION |
b6f35981 | 64 | select ARCH_WANT_FRAME_POINTERS |
f0b7f8a4 | 65 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
25c92a37 | 66 | select ARM_AMBA |
1aee5d7a | 67 | select ARM_ARCH_TIMER |
c4188edc | 68 | select ARM_GIC |
875cbf3e | 69 | select AUDIT_ARCH_COMPAT_GENERIC |
3ee80364 | 70 | select ARM_GIC_V2M if PCI |
021f6537 | 71 | select ARM_GIC_V3 |
3ee80364 | 72 | select ARM_GIC_V3_ITS if PCI |
bff60792 | 73 | select ARM_PSCI_FW |
adace895 | 74 | select BUILDTIME_EXTABLE_SORT |
db2789b5 | 75 | select CLONE_BACKWARDS |
7ca2ef33 | 76 | select COMMON_CLK |
166936ba | 77 | select CPU_PM if (SUSPEND || CPU_IDLE) |
7bc13fd3 | 78 | select DCACHE_WORD_ACCESS |
0d8488ac | 79 | select DMA_DIRECT_OPS |
ef37566c | 80 | select EDAC_SUPPORT |
2f34f173 | 81 | select FRAME_POINTER |
d4932f9e | 82 | select GENERIC_ALLOCATOR |
2ef7a295 | 83 | select GENERIC_ARCH_TOPOLOGY |
8c2c3df3 | 84 | select GENERIC_CLOCKEVENTS |
4b3dc967 | 85 | select GENERIC_CLOCKEVENTS_BROADCAST |
3be1a5c4 | 86 | select GENERIC_CPU_AUTOPROBE |
bf4b558e | 87 | select GENERIC_EARLY_IOREMAP |
2314ee4d | 88 | select GENERIC_IDLE_POLL_SETUP |
78ae2e1c | 89 | select GENERIC_IRQ_MULTI_HANDLER |
8c2c3df3 CM |
90 | select GENERIC_IRQ_PROBE |
91 | select GENERIC_IRQ_SHOW | |
6544e67b | 92 | select GENERIC_IRQ_SHOW_LEVEL |
cb61f676 | 93 | select GENERIC_PCI_IOMAP |
65cd4f6c | 94 | select GENERIC_SCHED_CLOCK |
8c2c3df3 | 95 | select GENERIC_SMP_IDLE_THREAD |
12a0ef7b WD |
96 | select GENERIC_STRNCPY_FROM_USER |
97 | select GENERIC_STRNLEN_USER | |
8c2c3df3 | 98 | select GENERIC_TIME_VSYSCALL |
a1ddc74a | 99 | select HANDLE_DOMAIN_IRQ |
8c2c3df3 | 100 | select HARDIRQS_SW_RESEND |
9f9a35a7 | 101 | select HAVE_ACPI_APEI if (ACPI && EFI) |
5284e1b4 | 102 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
875cbf3e | 103 | select HAVE_ARCH_AUDITSYSCALL |
8e7a4cef | 104 | select HAVE_ARCH_BITREVERSE |
324420bf | 105 | select HAVE_ARCH_HUGE_VMAP |
9732cafd | 106 | select HAVE_ARCH_JUMP_LABEL |
e17d8025 | 107 | select HAVE_ARCH_KASAN if !(ARM64_16K_PAGES && ARM64_VA_BITS_48) |
9529247d | 108 | select HAVE_ARCH_KGDB |
8f0d3aa9 DC |
109 | select HAVE_ARCH_MMAP_RND_BITS |
110 | select HAVE_ARCH_MMAP_RND_COMPAT_BITS if COMPAT | |
271ca788 | 111 | select HAVE_ARCH_PREL32_RELOCATIONS |
a1ae65b2 | 112 | select HAVE_ARCH_SECCOMP_FILTER |
0b3e3366 | 113 | select HAVE_ARCH_STACKLEAK |
9e8084d3 | 114 | select HAVE_ARCH_THREAD_STRUCT_WHITELIST |
8c2c3df3 | 115 | select HAVE_ARCH_TRACEHOOK |
8ee70879 | 116 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE |
e3067861 | 117 | select HAVE_ARCH_VMAP_STACK |
8ee70879 | 118 | select HAVE_ARM_SMCCC |
6077776b | 119 | select HAVE_EBPF_JIT |
af64d2aa | 120 | select HAVE_C_RECORDMCOUNT |
5284e1b4 | 121 | select HAVE_CMPXCHG_DOUBLE |
95eff6b2 | 122 | select HAVE_CMPXCHG_LOCAL |
8ee70879 | 123 | select HAVE_CONTEXT_TRACKING |
9b2a60c4 | 124 | select HAVE_DEBUG_BUGVERBOSE |
b69ec42b | 125 | select HAVE_DEBUG_KMEMLEAK |
6ac2104d | 126 | select HAVE_DMA_CONTIGUOUS |
bd7d38db | 127 | select HAVE_DYNAMIC_FTRACE |
50afc33a | 128 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
af64d2aa | 129 | select HAVE_FTRACE_MCOUNT_RECORD |
819e50e2 AT |
130 | select HAVE_FUNCTION_TRACER |
131 | select HAVE_FUNCTION_GRAPH_TRACER | |
6b90bd4b | 132 | select HAVE_GCC_PLUGINS |
8c2c3df3 | 133 | select HAVE_GENERIC_DMA_COHERENT |
8c2c3df3 | 134 | select HAVE_HW_BREAKPOINT if PERF_EVENTS |
24da208d | 135 | select HAVE_IRQ_TIME_ACCOUNTING |
8c2c3df3 | 136 | select HAVE_MEMBLOCK |
1a2db300 | 137 | select HAVE_MEMBLOCK_NODE_MAP if NUMA |
396a5d4a | 138 | select HAVE_NMI |
55834a77 | 139 | select HAVE_PATA_PLATFORM |
8c2c3df3 | 140 | select HAVE_PERF_EVENTS |
2ee0d7fd JP |
141 | select HAVE_PERF_REGS |
142 | select HAVE_PERF_USER_STACK_DUMP | |
0a8ea52c | 143 | select HAVE_REGS_AND_STACK_ACCESS_API |
5e5f6dc1 | 144 | select HAVE_RCU_TABLE_FREE |
409d5db4 | 145 | select HAVE_RSEQ |
d148eac0 | 146 | select HAVE_STACKPROTECTOR |
055b1212 | 147 | select HAVE_SYSCALL_TRACEPOINTS |
2dd0e8d2 | 148 | select HAVE_KPROBES |
cd1ee3b1 | 149 | select HAVE_KRETPROBES |
876945db | 150 | select IOMMU_DMA if IOMMU_SUPPORT |
8c2c3df3 | 151 | select IRQ_DOMAIN |
e8557d1f | 152 | select IRQ_FORCED_THREADING |
fea2acaa | 153 | select MODULES_USE_ELF_RELA |
667b24d0 | 154 | select MULTI_IRQ_HANDLER |
f616ab59 | 155 | select NEED_DMA_MAP_STATE |
86596f0a | 156 | select NEED_SG_DMA_LENGTH |
8c2c3df3 CM |
157 | select NO_BOOTMEM |
158 | select OF | |
159 | select OF_EARLY_FLATTREE | |
9bf14b7c | 160 | select OF_RESERVED_MEM |
0cb0786b | 161 | select PCI_ECAM if ACPI |
aa1e8ec1 CM |
162 | select POWER_RESET |
163 | select POWER_SUPPLY | |
4adcec11 | 164 | select REFCOUNT_FULL |
8c2c3df3 | 165 | select SPARSE_IRQ |
09230cbc | 166 | select SWIOTLB |
7ac57a89 | 167 | select SYSCTL_EXCEPTION_TRACE |
c02433dd | 168 | select THREAD_INFO_IN_TASK |
8c2c3df3 CM |
169 | help |
170 | ARM 64-bit (AArch64) Linux support. | |
171 | ||
172 | config 64BIT | |
173 | def_bool y | |
174 | ||
8c2c3df3 CM |
175 | config MMU |
176 | def_bool y | |
177 | ||
030c4d24 MR |
178 | config ARM64_PAGE_SHIFT |
179 | int | |
180 | default 16 if ARM64_64K_PAGES | |
181 | default 14 if ARM64_16K_PAGES | |
182 | default 12 | |
183 | ||
184 | config ARM64_CONT_SHIFT | |
185 | int | |
186 | default 5 if ARM64_64K_PAGES | |
187 | default 7 if ARM64_16K_PAGES | |
188 | default 4 | |
189 | ||
8f0d3aa9 DC |
190 | config ARCH_MMAP_RND_BITS_MIN |
191 | default 14 if ARM64_64K_PAGES | |
192 | default 16 if ARM64_16K_PAGES | |
193 | default 18 | |
194 | ||
195 | # max bits determined by the following formula: | |
196 | # VA_BITS - PAGE_SHIFT - 3 | |
197 | config ARCH_MMAP_RND_BITS_MAX | |
198 | default 19 if ARM64_VA_BITS=36 | |
199 | default 24 if ARM64_VA_BITS=39 | |
200 | default 27 if ARM64_VA_BITS=42 | |
201 | default 30 if ARM64_VA_BITS=47 | |
202 | default 29 if ARM64_VA_BITS=48 && ARM64_64K_PAGES | |
203 | default 31 if ARM64_VA_BITS=48 && ARM64_16K_PAGES | |
204 | default 33 if ARM64_VA_BITS=48 | |
205 | default 14 if ARM64_64K_PAGES | |
206 | default 16 if ARM64_16K_PAGES | |
207 | default 18 | |
208 | ||
209 | config ARCH_MMAP_RND_COMPAT_BITS_MIN | |
210 | default 7 if ARM64_64K_PAGES | |
211 | default 9 if ARM64_16K_PAGES | |
212 | default 11 | |
213 | ||
214 | config ARCH_MMAP_RND_COMPAT_BITS_MAX | |
215 | default 16 | |
216 | ||
ce816fa8 | 217 | config NO_IOPORT_MAP |
d1e6dc91 | 218 | def_bool y if !PCI |
8c2c3df3 CM |
219 | |
220 | config STACKTRACE_SUPPORT | |
221 | def_bool y | |
222 | ||
bf0c4e04 JVS |
223 | config ILLEGAL_POINTER_VALUE |
224 | hex | |
225 | default 0xdead000000000000 | |
226 | ||
8c2c3df3 CM |
227 | config LOCKDEP_SUPPORT |
228 | def_bool y | |
229 | ||
230 | config TRACE_IRQFLAGS_SUPPORT | |
231 | def_bool y | |
232 | ||
c209f799 | 233 | config RWSEM_XCHGADD_ALGORITHM |
8c2c3df3 CM |
234 | def_bool y |
235 | ||
9fb7410f DM |
236 | config GENERIC_BUG |
237 | def_bool y | |
238 | depends on BUG | |
239 | ||
240 | config GENERIC_BUG_RELATIVE_POINTERS | |
241 | def_bool y | |
242 | depends on GENERIC_BUG | |
243 | ||
8c2c3df3 CM |
244 | config GENERIC_HWEIGHT |
245 | def_bool y | |
246 | ||
247 | config GENERIC_CSUM | |
248 | def_bool y | |
249 | ||
250 | config GENERIC_CALIBRATE_DELAY | |
251 | def_bool y | |
252 | ||
ad67f5a6 | 253 | config ZONE_DMA32 |
8c2c3df3 CM |
254 | def_bool y |
255 | ||
e585513b | 256 | config HAVE_GENERIC_GUP |
29e56940 SC |
257 | def_bool y |
258 | ||
4b3dc967 WD |
259 | config SMP |
260 | def_bool y | |
261 | ||
4cfb3613 AB |
262 | config KERNEL_MODE_NEON |
263 | def_bool y | |
264 | ||
92cc15fc RH |
265 | config FIX_EARLYCON_MEM |
266 | def_bool y | |
267 | ||
9f25e6ad KS |
268 | config PGTABLE_LEVELS |
269 | int | |
21539939 | 270 | default 2 if ARM64_16K_PAGES && ARM64_VA_BITS_36 |
9f25e6ad KS |
271 | default 2 if ARM64_64K_PAGES && ARM64_VA_BITS_42 |
272 | default 3 if ARM64_64K_PAGES && ARM64_VA_BITS_48 | |
273 | default 3 if ARM64_4K_PAGES && ARM64_VA_BITS_39 | |
44eaacf1 SP |
274 | default 3 if ARM64_16K_PAGES && ARM64_VA_BITS_47 |
275 | default 4 if !ARM64_64K_PAGES && ARM64_VA_BITS_48 | |
9f25e6ad | 276 | |
9842ceae PA |
277 | config ARCH_SUPPORTS_UPROBES |
278 | def_bool y | |
279 | ||
8f360948 AB |
280 | config ARCH_PROC_KCORE_TEXT |
281 | def_bool y | |
282 | ||
6a377491 | 283 | source "arch/arm64/Kconfig.platforms" |
8c2c3df3 CM |
284 | |
285 | menu "Bus support" | |
286 | ||
d1e6dc91 LD |
287 | config PCI |
288 | bool "PCI support" | |
289 | help | |
290 | This feature enables support for PCI bus system. If you say Y | |
291 | here, the kernel will include drivers and infrastructure code | |
292 | to support PCI bus devices. | |
293 | ||
294 | config PCI_DOMAINS | |
295 | def_bool PCI | |
296 | ||
297 | config PCI_DOMAINS_GENERIC | |
298 | def_bool PCI | |
299 | ||
300 | config PCI_SYSCALL | |
301 | def_bool PCI | |
302 | ||
303 | source "drivers/pci/Kconfig" | |
d1e6dc91 | 304 | |
8c2c3df3 CM |
305 | endmenu |
306 | ||
307 | menu "Kernel Features" | |
308 | ||
c0a01b84 AP |
309 | menu "ARM errata workarounds via the alternatives framework" |
310 | ||
311 | config ARM64_ERRATUM_826319 | |
312 | bool "Cortex-A53: 826319: System might deadlock if a write cannot complete until read data is accepted" | |
313 | default y | |
314 | help | |
315 | This option adds an alternative code sequence to work around ARM | |
316 | erratum 826319 on Cortex-A53 parts up to r0p2 with an AMBA 4 ACE or | |
317 | AXI master interface and an L2 cache. | |
318 | ||
319 | If a Cortex-A53 uses an AMBA AXI4 ACE interface to other processors | |
320 | and is unable to accept a certain write via this interface, it will | |
321 | not progress on read data presented on the read data channel and the | |
322 | system can deadlock. | |
323 | ||
324 | The workaround promotes data cache clean instructions to | |
325 | data cache clean-and-invalidate. | |
326 | Please note that this does not necessarily enable the workaround, | |
327 | as it depends on the alternative framework, which will only patch | |
328 | the kernel if an affected CPU is detected. | |
329 | ||
330 | If unsure, say Y. | |
331 | ||
332 | config ARM64_ERRATUM_827319 | |
333 | bool "Cortex-A53: 827319: Data cache clean instructions might cause overlapping transactions to the interconnect" | |
334 | default y | |
335 | help | |
336 | This option adds an alternative code sequence to work around ARM | |
337 | erratum 827319 on Cortex-A53 parts up to r0p2 with an AMBA 5 CHI | |
338 | master interface and an L2 cache. | |
339 | ||
340 | Under certain conditions this erratum can cause a clean line eviction | |
341 | to occur at the same time as another transaction to the same address | |
342 | on the AMBA 5 CHI interface, which can cause data corruption if the | |
343 | interconnect reorders the two transactions. | |
344 | ||
345 | The workaround promotes data cache clean instructions to | |
346 | data cache clean-and-invalidate. | |
347 | Please note that this does not necessarily enable the workaround, | |
348 | as it depends on the alternative framework, which will only patch | |
349 | the kernel if an affected CPU is detected. | |
350 | ||
351 | If unsure, say Y. | |
352 | ||
353 | config ARM64_ERRATUM_824069 | |
354 | bool "Cortex-A53: 824069: Cache line might not be marked as clean after a CleanShared snoop" | |
355 | default y | |
356 | help | |
357 | This option adds an alternative code sequence to work around ARM | |
358 | erratum 824069 on Cortex-A53 parts up to r0p2 when it is connected | |
359 | to a coherent interconnect. | |
360 | ||
361 | If a Cortex-A53 processor is executing a store or prefetch for | |
362 | write instruction at the same time as a processor in another | |
363 | cluster is executing a cache maintenance operation to the same | |
364 | address, then this erratum might cause a clean cache line to be | |
365 | incorrectly marked as dirty. | |
366 | ||
367 | The workaround promotes data cache clean instructions to | |
368 | data cache clean-and-invalidate. | |
369 | Please note that this option does not necessarily enable the | |
370 | workaround, as it depends on the alternative framework, which will | |
371 | only patch the kernel if an affected CPU is detected. | |
372 | ||
373 | If unsure, say Y. | |
374 | ||
375 | config ARM64_ERRATUM_819472 | |
376 | bool "Cortex-A53: 819472: Store exclusive instructions might cause data corruption" | |
377 | default y | |
378 | help | |
379 | This option adds an alternative code sequence to work around ARM | |
380 | erratum 819472 on Cortex-A53 parts up to r0p1 with an L2 cache | |
381 | present when it is connected to a coherent interconnect. | |
382 | ||
383 | If the processor is executing a load and store exclusive sequence at | |
384 | the same time as a processor in another cluster is executing a cache | |
385 | maintenance operation to the same address, then this erratum might | |
386 | cause data corruption. | |
387 | ||
388 | The workaround promotes data cache clean instructions to | |
389 | data cache clean-and-invalidate. | |
390 | Please note that this does not necessarily enable the workaround, | |
391 | as it depends on the alternative framework, which will only patch | |
392 | the kernel if an affected CPU is detected. | |
393 | ||
394 | If unsure, say Y. | |
395 | ||
396 | config ARM64_ERRATUM_832075 | |
397 | bool "Cortex-A57: 832075: possible deadlock on mixing exclusive memory accesses with device loads" | |
398 | default y | |
399 | help | |
400 | This option adds an alternative code sequence to work around ARM | |
401 | erratum 832075 on Cortex-A57 parts up to r1p2. | |
402 | ||
403 | Affected Cortex-A57 parts might deadlock when exclusive load/store | |
404 | instructions to Write-Back memory are mixed with Device loads. | |
405 | ||
406 | The workaround is to promote device loads to use Load-Acquire | |
407 | semantics. | |
408 | Please note that this does not necessarily enable the workaround, | |
498cd5c3 MZ |
409 | as it depends on the alternative framework, which will only patch |
410 | the kernel if an affected CPU is detected. | |
411 | ||
412 | If unsure, say Y. | |
413 | ||
414 | config ARM64_ERRATUM_834220 | |
415 | bool "Cortex-A57: 834220: Stage 2 translation fault might be incorrectly reported in presence of a Stage 1 fault" | |
416 | depends on KVM | |
417 | default y | |
418 | help | |
419 | This option adds an alternative code sequence to work around ARM | |
420 | erratum 834220 on Cortex-A57 parts up to r1p2. | |
421 | ||
422 | Affected Cortex-A57 parts might report a Stage 2 translation | |
423 | fault as the result of a Stage 1 fault for load crossing a | |
424 | page boundary when there is a permission or device memory | |
425 | alignment fault at Stage 1 and a translation fault at Stage 2. | |
426 | ||
427 | The workaround is to verify that the Stage 1 translation | |
428 | doesn't generate a fault before handling the Stage 2 fault. | |
429 | Please note that this does not necessarily enable the workaround, | |
c0a01b84 AP |
430 | as it depends on the alternative framework, which will only patch |
431 | the kernel if an affected CPU is detected. | |
432 | ||
433 | If unsure, say Y. | |
434 | ||
905e8c5d WD |
435 | config ARM64_ERRATUM_845719 |
436 | bool "Cortex-A53: 845719: a load might read incorrect data" | |
437 | depends on COMPAT | |
438 | default y | |
439 | help | |
440 | This option adds an alternative code sequence to work around ARM | |
441 | erratum 845719 on Cortex-A53 parts up to r0p4. | |
442 | ||
443 | When running a compat (AArch32) userspace on an affected Cortex-A53 | |
444 | part, a load at EL0 from a virtual address that matches the bottom 32 | |
445 | bits of the virtual address used by a recent load at (AArch64) EL1 | |
446 | might return incorrect data. | |
447 | ||
448 | The workaround is to write the contextidr_el1 register on exception | |
449 | return to a 32-bit task. | |
450 | Please note that this does not necessarily enable the workaround, | |
451 | as it depends on the alternative framework, which will only patch | |
452 | the kernel if an affected CPU is detected. | |
453 | ||
454 | If unsure, say Y. | |
455 | ||
df057cc7 WD |
456 | config ARM64_ERRATUM_843419 |
457 | bool "Cortex-A53: 843419: A load or store might access an incorrect address" | |
df057cc7 | 458 | default y |
a257e025 | 459 | select ARM64_MODULE_PLTS if MODULES |
df057cc7 | 460 | help |
6ffe9923 | 461 | This option links the kernel with '--fix-cortex-a53-843419' and |
a257e025 AB |
462 | enables PLT support to replace certain ADRP instructions, which can |
463 | cause subsequent memory accesses to use an incorrect address on | |
464 | Cortex-A53 parts up to r0p4. | |
df057cc7 WD |
465 | |
466 | If unsure, say Y. | |
467 | ||
ece1397c SP |
468 | config ARM64_ERRATUM_1024718 |
469 | bool "Cortex-A55: 1024718: Update of DBM/AP bits without break before make might result in incorrect update" | |
470 | default y | |
471 | help | |
472 | This option adds work around for Arm Cortex-A55 Erratum 1024718. | |
473 | ||
474 | Affected Cortex-A55 cores (r0p0, r0p1, r1p0) could cause incorrect | |
475 | update of the hardware dirty bit when the DBM/AP bits are updated | |
476 | without a break-before-make. The work around is to disable the usage | |
477 | of hardware DBM locally on the affected cores. CPUs not affected by | |
478 | erratum will continue to use the feature. | |
df057cc7 WD |
479 | |
480 | If unsure, say Y. | |
481 | ||
94100970 RR |
482 | config CAVIUM_ERRATUM_22375 |
483 | bool "Cavium erratum 22375, 24313" | |
484 | default y | |
485 | help | |
486 | Enable workaround for erratum 22375, 24313. | |
487 | ||
488 | This implements two gicv3-its errata workarounds for ThunderX. Both | |
489 | with small impact affecting only ITS table allocation. | |
490 | ||
491 | erratum 22375: only alloc 8MB table size | |
492 | erratum 24313: ignore memory access type | |
493 | ||
494 | The fixes are in ITS initialization and basically ignore memory access | |
495 | type and table size provided by the TYPER and BASER registers. | |
496 | ||
497 | If unsure, say Y. | |
498 | ||
fbf8f40e GK |
499 | config CAVIUM_ERRATUM_23144 |
500 | bool "Cavium erratum 23144: ITS SYNC hang on dual socket system" | |
501 | depends on NUMA | |
502 | default y | |
503 | help | |
504 | ITS SYNC command hang for cross node io and collections/cpu mapping. | |
505 | ||
506 | If unsure, say Y. | |
507 | ||
6d4e11c5 RR |
508 | config CAVIUM_ERRATUM_23154 |
509 | bool "Cavium erratum 23154: Access to ICC_IAR1_EL1 is not sync'ed" | |
510 | default y | |
511 | help | |
512 | The gicv3 of ThunderX requires a modified version for | |
513 | reading the IAR status to ensure data synchronization | |
514 | (access to icc_iar1_el1 is not sync'ed before and after). | |
515 | ||
516 | If unsure, say Y. | |
517 | ||
104a0c02 AP |
518 | config CAVIUM_ERRATUM_27456 |
519 | bool "Cavium erratum 27456: Broadcast TLBI instructions may cause icache corruption" | |
520 | default y | |
521 | help | |
522 | On ThunderX T88 pass 1.x through 2.1 parts, broadcast TLBI | |
523 | instructions may cause the icache to become corrupted if it | |
524 | contains data for a non-current ASID. The fix is to | |
525 | invalidate the icache when changing the mm context. | |
526 | ||
527 | If unsure, say Y. | |
528 | ||
690a3415 DD |
529 | config CAVIUM_ERRATUM_30115 |
530 | bool "Cavium erratum 30115: Guest may disable interrupts in host" | |
531 | default y | |
532 | help | |
533 | On ThunderX T88 pass 1.x through 2.2, T81 pass 1.0 through | |
534 | 1.2, and T83 Pass 1.0, KVM guest execution may disable | |
535 | interrupts in host. Trapping both GICv3 group-0 and group-1 | |
536 | accesses sidesteps the issue. | |
537 | ||
538 | If unsure, say Y. | |
539 | ||
38fd94b0 CC |
540 | config QCOM_FALKOR_ERRATUM_1003 |
541 | bool "Falkor E1003: Incorrect translation due to ASID change" | |
542 | default y | |
38fd94b0 CC |
543 | help |
544 | On Falkor v1, an incorrect ASID may be cached in the TLB when ASID | |
d1777e68 WD |
545 | and BADDR are changed together in TTBRx_EL1. Since we keep the ASID |
546 | in TTBR1_EL1, this situation only occurs in the entry trampoline and | |
547 | then only for entries in the walk cache, since the leaf translation | |
548 | is unchanged. Work around the erratum by invalidating the walk cache | |
549 | entries for the trampoline before entering the kernel proper. | |
38fd94b0 | 550 | |
d9ff80f8 CC |
551 | config QCOM_FALKOR_ERRATUM_1009 |
552 | bool "Falkor E1009: Prematurely complete a DSB after a TLBI" | |
553 | default y | |
554 | help | |
555 | On Falkor v1, the CPU may prematurely complete a DSB following a | |
556 | TLBI xxIS invalidate maintenance operation. Repeat the TLBI operation | |
557 | one more time to fix the issue. | |
558 | ||
559 | If unsure, say Y. | |
560 | ||
90922a2d SD |
561 | config QCOM_QDF2400_ERRATUM_0065 |
562 | bool "QDF2400 E0065: Incorrect GITS_TYPER.ITT_Entry_size" | |
563 | default y | |
564 | help | |
565 | On Qualcomm Datacenter Technologies QDF2400 SoC, ITS hardware reports | |
566 | ITE size incorrectly. The GITS_TYPER.ITT_Entry_size field should have | |
567 | been indicated as 16Bytes (0xf), not 8Bytes (0x7). | |
568 | ||
569 | If unsure, say Y. | |
570 | ||
558b0165 AB |
571 | config SOCIONEXT_SYNQUACER_PREITS |
572 | bool "Socionext Synquacer: Workaround for GICv3 pre-ITS" | |
573 | default y | |
574 | help | |
575 | Socionext Synquacer SoCs implement a separate h/w block to generate | |
576 | MSI doorbell writes with non-zero values for the device ID. | |
577 | ||
5c9a882e MZ |
578 | If unsure, say Y. |
579 | ||
580 | config HISILICON_ERRATUM_161600802 | |
581 | bool "Hip07 161600802: Erroneous redistributor VLPI base" | |
582 | default y | |
583 | help | |
584 | The HiSilicon Hip07 SoC usees the wrong redistributor base | |
585 | when issued ITS commands such as VMOVP and VMAPP, and requires | |
586 | a 128kB offset to be applied to the target address in this commands. | |
587 | ||
558b0165 | 588 | If unsure, say Y. |
932b50c7 SD |
589 | |
590 | config QCOM_FALKOR_ERRATUM_E1041 | |
591 | bool "Falkor E1041: Speculative instruction fetches might cause errant memory access" | |
592 | default y | |
593 | help | |
594 | Falkor CPU may speculatively fetch instructions from an improper | |
595 | memory location when MMU translation is changed from SCTLR_ELn[M]=1 | |
596 | to SCTLR_ELn[M]=0. Prefix an ISB instruction to fix the problem. | |
597 | ||
598 | If unsure, say Y. | |
599 | ||
c0a01b84 AP |
600 | endmenu |
601 | ||
602 | ||
e41ceed0 JL |
603 | choice |
604 | prompt "Page size" | |
605 | default ARM64_4K_PAGES | |
606 | help | |
607 | Page size (translation granule) configuration. | |
608 | ||
609 | config ARM64_4K_PAGES | |
610 | bool "4KB" | |
611 | help | |
612 | This feature enables 4KB pages support. | |
613 | ||
44eaacf1 SP |
614 | config ARM64_16K_PAGES |
615 | bool "16KB" | |
616 | help | |
617 | The system will use 16KB pages support. AArch32 emulation | |
618 | requires applications compiled with 16K (or a multiple of 16K) | |
619 | aligned segments. | |
620 | ||
8c2c3df3 | 621 | config ARM64_64K_PAGES |
e41ceed0 | 622 | bool "64KB" |
8c2c3df3 CM |
623 | help |
624 | This feature enables 64KB pages support (4KB by default) | |
625 | allowing only two levels of page tables and faster TLB | |
db488be3 SP |
626 | look-up. AArch32 emulation requires applications compiled |
627 | with 64K aligned segments. | |
8c2c3df3 | 628 | |
e41ceed0 JL |
629 | endchoice |
630 | ||
631 | choice | |
632 | prompt "Virtual address space size" | |
633 | default ARM64_VA_BITS_39 if ARM64_4K_PAGES | |
44eaacf1 | 634 | default ARM64_VA_BITS_47 if ARM64_16K_PAGES |
e41ceed0 JL |
635 | default ARM64_VA_BITS_42 if ARM64_64K_PAGES |
636 | help | |
637 | Allows choosing one of multiple possible virtual address | |
638 | space sizes. The level of translation table is determined by | |
639 | a combination of page size and virtual address space size. | |
640 | ||
21539939 | 641 | config ARM64_VA_BITS_36 |
56a3f30e | 642 | bool "36-bit" if EXPERT |
21539939 SP |
643 | depends on ARM64_16K_PAGES |
644 | ||
e41ceed0 JL |
645 | config ARM64_VA_BITS_39 |
646 | bool "39-bit" | |
647 | depends on ARM64_4K_PAGES | |
648 | ||
649 | config ARM64_VA_BITS_42 | |
650 | bool "42-bit" | |
651 | depends on ARM64_64K_PAGES | |
652 | ||
44eaacf1 SP |
653 | config ARM64_VA_BITS_47 |
654 | bool "47-bit" | |
655 | depends on ARM64_16K_PAGES | |
656 | ||
c79b954b JL |
657 | config ARM64_VA_BITS_48 |
658 | bool "48-bit" | |
c79b954b | 659 | |
e41ceed0 JL |
660 | endchoice |
661 | ||
662 | config ARM64_VA_BITS | |
663 | int | |
21539939 | 664 | default 36 if ARM64_VA_BITS_36 |
e41ceed0 JL |
665 | default 39 if ARM64_VA_BITS_39 |
666 | default 42 if ARM64_VA_BITS_42 | |
44eaacf1 | 667 | default 47 if ARM64_VA_BITS_47 |
c79b954b | 668 | default 48 if ARM64_VA_BITS_48 |
e41ceed0 | 669 | |
982aa7c5 KM |
670 | choice |
671 | prompt "Physical address space size" | |
672 | default ARM64_PA_BITS_48 | |
673 | help | |
674 | Choose the maximum physical address range that the kernel will | |
675 | support. | |
676 | ||
677 | config ARM64_PA_BITS_48 | |
678 | bool "48-bit" | |
679 | ||
f77d2817 KM |
680 | config ARM64_PA_BITS_52 |
681 | bool "52-bit (ARMv8.2)" | |
682 | depends on ARM64_64K_PAGES | |
683 | depends on ARM64_PAN || !ARM64_SW_TTBR0_PAN | |
684 | help | |
685 | Enable support for a 52-bit physical address space, introduced as | |
686 | part of the ARMv8.2-LPA extension. | |
687 | ||
688 | With this enabled, the kernel will also continue to work on CPUs that | |
689 | do not support ARMv8.2-LPA, but with some added memory overhead (and | |
690 | minor performance overhead). | |
691 | ||
982aa7c5 KM |
692 | endchoice |
693 | ||
694 | config ARM64_PA_BITS | |
695 | int | |
696 | default 48 if ARM64_PA_BITS_48 | |
f77d2817 | 697 | default 52 if ARM64_PA_BITS_52 |
982aa7c5 | 698 | |
a872013d WD |
699 | config CPU_BIG_ENDIAN |
700 | bool "Build big-endian kernel" | |
701 | help | |
702 | Say Y if you plan on running a kernel in big-endian mode. | |
703 | ||
f6e763b9 MB |
704 | config SCHED_MC |
705 | bool "Multi-core scheduler support" | |
f6e763b9 MB |
706 | help |
707 | Multi-core scheduler support improves the CPU scheduler's decision | |
708 | making when dealing with multi-core CPU chips at a cost of slightly | |
709 | increased overhead in some places. If unsure say N here. | |
710 | ||
711 | config SCHED_SMT | |
712 | bool "SMT scheduler support" | |
f6e763b9 MB |
713 | help |
714 | Improves the CPU scheduler's decision making when dealing with | |
715 | MultiThreading at a cost of slightly increased overhead in some | |
716 | places. If unsure say N here. | |
717 | ||
8c2c3df3 | 718 | config NR_CPUS |
62aa9655 GK |
719 | int "Maximum number of CPUs (2-4096)" |
720 | range 2 4096 | |
15942853 | 721 | # These have to remain sorted largest to smallest |
e3672649 | 722 | default "64" |
8c2c3df3 | 723 | |
9327e2c6 MR |
724 | config HOTPLUG_CPU |
725 | bool "Support for hot-pluggable CPUs" | |
217d453d | 726 | select GENERIC_IRQ_MIGRATION |
9327e2c6 MR |
727 | help |
728 | Say Y here to experiment with turning CPUs off and on. CPUs | |
729 | can be controlled through /sys/devices/system/cpu. | |
730 | ||
1a2db300 GK |
731 | # Common NUMA Features |
732 | config NUMA | |
733 | bool "Numa Memory Allocation and Scheduler Support" | |
0c2a6cce KW |
734 | select ACPI_NUMA if ACPI |
735 | select OF_NUMA | |
1a2db300 GK |
736 | help |
737 | Enable NUMA (Non Uniform Memory Access) support. | |
738 | ||
739 | The kernel will try to allocate memory used by a CPU on the | |
740 | local memory of the CPU and add some more | |
741 | NUMA awareness to the kernel. | |
742 | ||
743 | config NODES_SHIFT | |
744 | int "Maximum NUMA Nodes (as a power of 2)" | |
745 | range 1 10 | |
746 | default "2" | |
747 | depends on NEED_MULTIPLE_NODES | |
748 | help | |
749 | Specify the maximum number of NUMA Nodes available on the target | |
750 | system. Increases memory reserved to accommodate various tables. | |
751 | ||
752 | config USE_PERCPU_NUMA_NODE_ID | |
753 | def_bool y | |
754 | depends on NUMA | |
755 | ||
7af3a0a9 ZL |
756 | config HAVE_SETUP_PER_CPU_AREA |
757 | def_bool y | |
758 | depends on NUMA | |
759 | ||
760 | config NEED_PER_CPU_EMBED_FIRST_CHUNK | |
761 | def_bool y | |
762 | depends on NUMA | |
763 | ||
6d526ee2 AB |
764 | config HOLES_IN_ZONE |
765 | def_bool y | |
766 | depends on NUMA | |
767 | ||
f90df5e2 | 768 | source kernel/Kconfig.hz |
8c2c3df3 | 769 | |
83863f25 LA |
770 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
771 | def_bool y | |
772 | ||
8c2c3df3 CM |
773 | config ARCH_HAS_HOLES_MEMORYMODEL |
774 | def_bool y if SPARSEMEM | |
775 | ||
776 | config ARCH_SPARSEMEM_ENABLE | |
777 | def_bool y | |
778 | select SPARSEMEM_VMEMMAP_ENABLE | |
779 | ||
780 | config ARCH_SPARSEMEM_DEFAULT | |
781 | def_bool ARCH_SPARSEMEM_ENABLE | |
782 | ||
783 | config ARCH_SELECT_MEMORY_MODEL | |
784 | def_bool ARCH_SPARSEMEM_ENABLE | |
785 | ||
e7d4bac4 | 786 | config ARCH_FLATMEM_ENABLE |
54501ac1 | 787 | def_bool !NUMA |
e7d4bac4 | 788 | |
8c2c3df3 CM |
789 | config HAVE_ARCH_PFN_VALID |
790 | def_bool ARCH_HAS_HOLES_MEMORYMODEL || !SPARSEMEM | |
791 | ||
792 | config HW_PERF_EVENTS | |
6475b2d8 MR |
793 | def_bool y |
794 | depends on ARM_PMU | |
8c2c3df3 | 795 | |
084bd298 SC |
796 | config SYS_SUPPORTS_HUGETLBFS |
797 | def_bool y | |
798 | ||
084bd298 | 799 | config ARCH_WANT_HUGE_PMD_SHARE |
21539939 | 800 | def_bool y if ARM64_4K_PAGES || (ARM64_16K_PAGES && !ARM64_VA_BITS_36) |
084bd298 | 801 | |
a41dc0e8 CM |
802 | config ARCH_HAS_CACHE_LINE_SIZE |
803 | def_bool y | |
804 | ||
a1ae65b2 AT |
805 | config SECCOMP |
806 | bool "Enable seccomp to safely compute untrusted bytecode" | |
807 | ---help--- | |
808 | This kernel feature is useful for number crunching applications | |
809 | that may need to compute untrusted bytecode during their | |
810 | execution. By using pipes or other transports made available to | |
811 | the process as file descriptors supporting the read/write | |
812 | syscalls, it's possible to isolate those applications in | |
813 | their own address space using seccomp. Once seccomp is | |
814 | enabled via prctl(PR_SET_SECCOMP), it cannot be disabled | |
815 | and the task is only allowed to execute a few safe syscalls | |
816 | defined by each seccomp mode. | |
817 | ||
dfd57bc3 SS |
818 | config PARAVIRT |
819 | bool "Enable paravirtualization code" | |
820 | help | |
821 | This changes the kernel so it can modify itself when it is run | |
822 | under a hypervisor, potentially improving performance significantly | |
823 | over full virtualization. | |
824 | ||
825 | config PARAVIRT_TIME_ACCOUNTING | |
826 | bool "Paravirtual steal time accounting" | |
827 | select PARAVIRT | |
828 | default n | |
829 | help | |
830 | Select this option to enable fine granularity task steal time | |
831 | accounting. Time spent executing other tasks in parallel with | |
832 | the current vCPU is discounted from the vCPU power. To account for | |
833 | that, there can be a small performance impact. | |
834 | ||
835 | If in doubt, say N here. | |
836 | ||
d28f6df1 GL |
837 | config KEXEC |
838 | depends on PM_SLEEP_SMP | |
839 | select KEXEC_CORE | |
840 | bool "kexec system call" | |
841 | ---help--- | |
842 | kexec is a system call that implements the ability to shutdown your | |
843 | current kernel, and to start another kernel. It is like a reboot | |
844 | but it is independent of the system firmware. And like a reboot | |
845 | you can start any kernel with it, not just Linux. | |
846 | ||
e62aaeac AT |
847 | config CRASH_DUMP |
848 | bool "Build kdump crash kernel" | |
849 | help | |
850 | Generate crash dump after being started by kexec. This should | |
851 | be normally only set in special crash dump kernels which are | |
852 | loaded in the main kernel with kexec-tools into a specially | |
853 | reserved region and then later executed after a crash by | |
854 | kdump/kexec. | |
855 | ||
856 | For more details see Documentation/kdump/kdump.txt | |
857 | ||
aa42aa13 SS |
858 | config XEN_DOM0 |
859 | def_bool y | |
860 | depends on XEN | |
861 | ||
862 | config XEN | |
c2ba1f7d | 863 | bool "Xen guest support on ARM64" |
aa42aa13 | 864 | depends on ARM64 && OF |
83862ccf | 865 | select SWIOTLB_XEN |
dfd57bc3 | 866 | select PARAVIRT |
aa42aa13 SS |
867 | help |
868 | Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. | |
869 | ||
d03bb145 SC |
870 | config FORCE_MAX_ZONEORDER |
871 | int | |
872 | default "14" if (ARM64_64K_PAGES && TRANSPARENT_HUGEPAGE) | |
44eaacf1 | 873 | default "12" if (ARM64_16K_PAGES && TRANSPARENT_HUGEPAGE) |
d03bb145 | 874 | default "11" |
44eaacf1 SP |
875 | help |
876 | The kernel memory allocator divides physically contiguous memory | |
877 | blocks into "zones", where each zone is a power of two number of | |
878 | pages. This option selects the largest power of two that the kernel | |
879 | keeps in the memory allocator. If you need to allocate very large | |
880 | blocks of physically contiguous memory, then you may need to | |
881 | increase this value. | |
882 | ||
883 | This config option is actually maximum order plus one. For example, | |
884 | a value of 11 means that the largest free memory block is 2^10 pages. | |
885 | ||
886 | We make sure that we can allocate upto a HugePage size for each configuration. | |
887 | Hence we have : | |
888 | MAX_ORDER = (PMD_SHIFT - PAGE_SHIFT) + 1 => PAGE_SHIFT - 2 | |
889 | ||
890 | However for 4K, we choose a higher default value, 11 as opposed to 10, giving us | |
891 | 4M allocations matching the default size used by generic code. | |
d03bb145 | 892 | |
084eb77c | 893 | config UNMAP_KERNEL_AT_EL0 |
0617052d | 894 | bool "Unmap kernel when running in userspace (aka \"KAISER\")" if EXPERT |
084eb77c WD |
895 | default y |
896 | help | |
0617052d WD |
897 | Speculation attacks against some high-performance processors can |
898 | be used to bypass MMU permission checks and leak kernel data to | |
899 | userspace. This can be defended against by unmapping the kernel | |
900 | when running in userspace, mapping it back in on exception entry | |
901 | via a trampoline page in the vector table. | |
084eb77c WD |
902 | |
903 | If unsure, say Y. | |
904 | ||
0f15adbb WD |
905 | config HARDEN_BRANCH_PREDICTOR |
906 | bool "Harden the branch predictor against aliasing attacks" if EXPERT | |
907 | default y | |
908 | help | |
909 | Speculation attacks against some high-performance processors rely on | |
910 | being able to manipulate the branch predictor for a victim context by | |
911 | executing aliasing branches in the attacker context. Such attacks | |
912 | can be partially mitigated against by clearing internal branch | |
913 | predictor state and limiting the prediction logic in some situations. | |
914 | ||
915 | This config option will take CPU-specific actions to harden the | |
916 | branch predictor against aliasing attacks and may rely on specific | |
917 | instruction sequences or control bits being set by the system | |
918 | firmware. | |
919 | ||
920 | If unsure, say Y. | |
921 | ||
dee39247 MZ |
922 | config HARDEN_EL2_VECTORS |
923 | bool "Harden EL2 vector mapping against system register leak" if EXPERT | |
924 | default y | |
925 | help | |
926 | Speculation attacks against some high-performance processors can | |
927 | be used to leak privileged information such as the vector base | |
928 | register, resulting in a potential defeat of the EL2 layout | |
929 | randomization. | |
930 | ||
931 | This config option will map the vectors to a fixed location, | |
932 | independent of the EL2 code mapping, so that revealing VBAR_EL2 | |
933 | to an attacker does not give away any extra information. This | |
934 | only gets enabled on affected CPUs. | |
935 | ||
936 | If unsure, say Y. | |
937 | ||
a725e3dd MZ |
938 | config ARM64_SSBD |
939 | bool "Speculative Store Bypass Disable" if EXPERT | |
940 | default y | |
941 | help | |
942 | This enables mitigation of the bypassing of previous stores | |
943 | by speculative loads. | |
944 | ||
945 | If unsure, say Y. | |
946 | ||
1b907f46 WD |
947 | menuconfig ARMV8_DEPRECATED |
948 | bool "Emulate deprecated/obsolete ARMv8 instructions" | |
949 | depends on COMPAT | |
6cfa7cc4 | 950 | depends on SYSCTL |
1b907f46 WD |
951 | help |
952 | Legacy software support may require certain instructions | |
953 | that have been deprecated or obsoleted in the architecture. | |
954 | ||
955 | Enable this config to enable selective emulation of these | |
956 | features. | |
957 | ||
958 | If unsure, say Y | |
959 | ||
960 | if ARMV8_DEPRECATED | |
961 | ||
962 | config SWP_EMULATION | |
963 | bool "Emulate SWP/SWPB instructions" | |
964 | help | |
965 | ARMv8 obsoletes the use of A32 SWP/SWPB instructions such that | |
966 | they are always undefined. Say Y here to enable software | |
967 | emulation of these instructions for userspace using LDXR/STXR. | |
968 | ||
969 | In some older versions of glibc [<=2.8] SWP is used during futex | |
970 | trylock() operations with the assumption that the code will not | |
971 | be preempted. This invalid assumption may be more likely to fail | |
972 | with SWP emulation enabled, leading to deadlock of the user | |
973 | application. | |
974 | ||
975 | NOTE: when accessing uncached shared regions, LDXR/STXR rely | |
976 | on an external transaction monitoring block called a global | |
977 | monitor to maintain update atomicity. If your system does not | |
978 | implement a global monitor, this option can cause programs that | |
979 | perform SWP operations to uncached memory to deadlock. | |
980 | ||
981 | If unsure, say Y | |
982 | ||
983 | config CP15_BARRIER_EMULATION | |
984 | bool "Emulate CP15 Barrier instructions" | |
985 | help | |
986 | The CP15 barrier instructions - CP15ISB, CP15DSB, and | |
987 | CP15DMB - are deprecated in ARMv8 (and ARMv7). It is | |
988 | strongly recommended to use the ISB, DSB, and DMB | |
989 | instructions instead. | |
990 | ||
991 | Say Y here to enable software emulation of these | |
992 | instructions for AArch32 userspace code. When this option is | |
993 | enabled, CP15 barrier usage is traced which can help | |
994 | identify software that needs updating. | |
995 | ||
996 | If unsure, say Y | |
997 | ||
2d888f48 SP |
998 | config SETEND_EMULATION |
999 | bool "Emulate SETEND instruction" | |
1000 | help | |
1001 | The SETEND instruction alters the data-endianness of the | |
1002 | AArch32 EL0, and is deprecated in ARMv8. | |
1003 | ||
1004 | Say Y here to enable software emulation of the instruction | |
1005 | for AArch32 userspace code. | |
1006 | ||
1007 | Note: All the cpus on the system must have mixed endian support at EL0 | |
1008 | for this feature to be enabled. If a new CPU - which doesn't support mixed | |
1009 | endian - is hotplugged in after this feature has been enabled, there could | |
1010 | be unexpected results in the applications. | |
1011 | ||
1012 | If unsure, say Y | |
1b907f46 WD |
1013 | endif |
1014 | ||
ba42822a CM |
1015 | config ARM64_SW_TTBR0_PAN |
1016 | bool "Emulate Privileged Access Never using TTBR0_EL1 switching" | |
1017 | help | |
1018 | Enabling this option prevents the kernel from accessing | |
1019 | user-space memory directly by pointing TTBR0_EL1 to a reserved | |
1020 | zeroed area and reserved ASID. The user access routines | |
1021 | restore the valid TTBR0_EL1 temporarily. | |
1022 | ||
0e4a0709 WD |
1023 | menu "ARMv8.1 architectural features" |
1024 | ||
1025 | config ARM64_HW_AFDBM | |
1026 | bool "Support for hardware updates of the Access and Dirty page flags" | |
1027 | default y | |
1028 | help | |
1029 | The ARMv8.1 architecture extensions introduce support for | |
1030 | hardware updates of the access and dirty information in page | |
1031 | table entries. When enabled in TCR_EL1 (HA and HD bits) on | |
1032 | capable processors, accesses to pages with PTE_AF cleared will | |
1033 | set this bit instead of raising an access flag fault. | |
1034 | Similarly, writes to read-only pages with the DBM bit set will | |
1035 | clear the read-only bit (AP[2]) instead of raising a | |
1036 | permission fault. | |
1037 | ||
1038 | Kernels built with this configuration option enabled continue | |
1039 | to work on pre-ARMv8.1 hardware and the performance impact is | |
1040 | minimal. If unsure, say Y. | |
1041 | ||
1042 | config ARM64_PAN | |
1043 | bool "Enable support for Privileged Access Never (PAN)" | |
1044 | default y | |
1045 | help | |
1046 | Privileged Access Never (PAN; part of the ARMv8.1 Extensions) | |
1047 | prevents the kernel or hypervisor from accessing user-space (EL0) | |
1048 | memory directly. | |
1049 | ||
1050 | Choosing this option will cause any unprotected (not using | |
1051 | copy_to_user et al) memory access to fail with a permission fault. | |
1052 | ||
1053 | The feature is detected at runtime, and will remain as a 'nop' | |
1054 | instruction if the cpu does not implement the feature. | |
1055 | ||
1056 | config ARM64_LSE_ATOMICS | |
1057 | bool "Atomic instructions" | |
7bd99b40 | 1058 | default y |
0e4a0709 WD |
1059 | help |
1060 | As part of the Large System Extensions, ARMv8.1 introduces new | |
1061 | atomic instructions that are designed specifically to scale in | |
1062 | very large systems. | |
1063 | ||
1064 | Say Y here to make use of these instructions for the in-kernel | |
1065 | atomic routines. This incurs a small overhead on CPUs that do | |
1066 | not support these instructions and requires the kernel to be | |
7bd99b40 WD |
1067 | built with binutils >= 2.25 in order for the new instructions |
1068 | to be used. | |
0e4a0709 | 1069 | |
1f364c8c MZ |
1070 | config ARM64_VHE |
1071 | bool "Enable support for Virtualization Host Extensions (VHE)" | |
1072 | default y | |
1073 | help | |
1074 | Virtualization Host Extensions (VHE) allow the kernel to run | |
1075 | directly at EL2 (instead of EL1) on processors that support | |
1076 | it. This leads to better performance for KVM, as they reduce | |
1077 | the cost of the world switch. | |
1078 | ||
1079 | Selecting this option allows the VHE feature to be detected | |
1080 | at runtime, and does not affect processors that do not | |
1081 | implement this feature. | |
1082 | ||
0e4a0709 WD |
1083 | endmenu |
1084 | ||
f993318b WD |
1085 | menu "ARMv8.2 architectural features" |
1086 | ||
57f4959b JM |
1087 | config ARM64_UAO |
1088 | bool "Enable support for User Access Override (UAO)" | |
1089 | default y | |
1090 | help | |
1091 | User Access Override (UAO; part of the ARMv8.2 Extensions) | |
1092 | causes the 'unprivileged' variant of the load/store instructions to | |
83fc61a5 | 1093 | be overridden to be privileged. |
57f4959b JM |
1094 | |
1095 | This option changes get_user() and friends to use the 'unprivileged' | |
1096 | variant of the load/store instructions. This ensures that user-space | |
1097 | really did have access to the supplied memory. When addr_limit is | |
1098 | set to kernel memory the UAO bit will be set, allowing privileged | |
1099 | access to kernel memory. | |
1100 | ||
1101 | Choosing this option will cause copy_to_user() et al to use user-space | |
1102 | memory permissions. | |
1103 | ||
1104 | The feature is detected at runtime, the kernel will use the | |
1105 | regular load/store instructions if the cpu does not implement the | |
1106 | feature. | |
1107 | ||
d50e071f RM |
1108 | config ARM64_PMEM |
1109 | bool "Enable support for persistent memory" | |
1110 | select ARCH_HAS_PMEM_API | |
5d7bdeb1 | 1111 | select ARCH_HAS_UACCESS_FLUSHCACHE |
d50e071f RM |
1112 | help |
1113 | Say Y to enable support for the persistent memory API based on the | |
1114 | ARMv8.2 DCPoP feature. | |
1115 | ||
1116 | The feature is detected at runtime, and the kernel will use DC CVAC | |
1117 | operations if DC CVAP is not supported (following the behaviour of | |
1118 | DC CVAP itself if the system does not define a point of persistence). | |
1119 | ||
64c02720 XX |
1120 | config ARM64_RAS_EXTN |
1121 | bool "Enable support for RAS CPU Extensions" | |
1122 | default y | |
1123 | help | |
1124 | CPUs that support the Reliability, Availability and Serviceability | |
1125 | (RAS) Extensions, part of ARMv8.2 are able to track faults and | |
1126 | errors, classify them and report them to software. | |
1127 | ||
1128 | On CPUs with these extensions system software can use additional | |
1129 | barriers to determine if faults are pending and read the | |
1130 | classification from a new set of registers. | |
1131 | ||
1132 | Selecting this feature will allow the kernel to use these barriers | |
1133 | and access the new registers if the system supports the extension. | |
1134 | Platform RAS features may additionally depend on firmware support. | |
1135 | ||
f993318b WD |
1136 | endmenu |
1137 | ||
ddd25ad1 DM |
1138 | config ARM64_SVE |
1139 | bool "ARM Scalable Vector Extension support" | |
1140 | default y | |
85acda3b | 1141 | depends on !KVM || ARM64_VHE |
ddd25ad1 DM |
1142 | help |
1143 | The Scalable Vector Extension (SVE) is an extension to the AArch64 | |
1144 | execution state which complements and extends the SIMD functionality | |
1145 | of the base architecture to support much larger vectors and to enable | |
1146 | additional vectorisation opportunities. | |
1147 | ||
1148 | To enable use of this extension on CPUs that implement it, say Y. | |
1149 | ||
5043694e DM |
1150 | Note that for architectural reasons, firmware _must_ implement SVE |
1151 | support when running on SVE capable hardware. The required support | |
1152 | is present in: | |
1153 | ||
1154 | * version 1.5 and later of the ARM Trusted Firmware | |
1155 | * the AArch64 boot wrapper since commit 5e1261e08abf | |
1156 | ("bootwrapper: SVE: Enable SVE for EL2 and below"). | |
1157 | ||
1158 | For other firmware implementations, consult the firmware documentation | |
1159 | or vendor. | |
1160 | ||
1161 | If you need the kernel to boot on SVE-capable hardware with broken | |
1162 | firmware, you may need to say N here until you get your firmware | |
1163 | fixed. Otherwise, you may experience firmware panics or lockups when | |
1164 | booting the kernel. If unsure and you are not observing these | |
1165 | symptoms, you should assume that it is safe to say Y. | |
fd045f6c | 1166 | |
85acda3b DM |
1167 | CPUs that support SVE are architecturally required to support the |
1168 | Virtualization Host Extensions (VHE), so the kernel makes no | |
1169 | provision for supporting SVE alongside KVM without VHE enabled. | |
1170 | Thus, you will need to enable CONFIG_ARM64_VHE if you want to support | |
1171 | KVM in the same kernel image. | |
1172 | ||
fd045f6c AB |
1173 | config ARM64_MODULE_PLTS |
1174 | bool | |
fd045f6c AB |
1175 | select HAVE_MOD_ARCH_SPECIFIC |
1176 | ||
1e48ef7f AB |
1177 | config RELOCATABLE |
1178 | bool | |
1179 | help | |
1180 | This builds the kernel as a Position Independent Executable (PIE), | |
1181 | which retains all relocation metadata required to relocate the | |
1182 | kernel binary at runtime to a different virtual address than the | |
1183 | address it was linked at. | |
1184 | Since AArch64 uses the RELA relocation format, this requires a | |
1185 | relocation pass at runtime even if the kernel is loaded at the | |
1186 | same address it was linked at. | |
1187 | ||
f80fb3a3 AB |
1188 | config RANDOMIZE_BASE |
1189 | bool "Randomize the address of the kernel image" | |
b9c220b5 | 1190 | select ARM64_MODULE_PLTS if MODULES |
f80fb3a3 AB |
1191 | select RELOCATABLE |
1192 | help | |
1193 | Randomizes the virtual address at which the kernel image is | |
1194 | loaded, as a security feature that deters exploit attempts | |
1195 | relying on knowledge of the location of kernel internals. | |
1196 | ||
1197 | It is the bootloader's job to provide entropy, by passing a | |
1198 | random u64 value in /chosen/kaslr-seed at kernel entry. | |
1199 | ||
2b5fe07a AB |
1200 | When booting via the UEFI stub, it will invoke the firmware's |
1201 | EFI_RNG_PROTOCOL implementation (if available) to supply entropy | |
1202 | to the kernel proper. In addition, it will randomise the physical | |
1203 | location of the kernel Image as well. | |
1204 | ||
f80fb3a3 AB |
1205 | If unsure, say N. |
1206 | ||
1207 | config RANDOMIZE_MODULE_REGION_FULL | |
f2b9ba87 | 1208 | bool "Randomize the module region over a 4 GB range" |
e71a4e1b | 1209 | depends on RANDOMIZE_BASE |
f80fb3a3 AB |
1210 | default y |
1211 | help | |
f2b9ba87 AB |
1212 | Randomizes the location of the module region inside a 4 GB window |
1213 | covering the core kernel. This way, it is less likely for modules | |
f80fb3a3 AB |
1214 | to leak information about the location of core kernel data structures |
1215 | but it does imply that function calls between modules and the core | |
1216 | kernel will need to be resolved via veneers in the module PLT. | |
1217 | ||
1218 | When this option is not set, the module region will be randomized over | |
1219 | a limited range that contains the [_stext, _etext] interval of the | |
1220 | core kernel, so branch relocations are always in range. | |
1221 | ||
8c2c3df3 CM |
1222 | endmenu |
1223 | ||
1224 | menu "Boot options" | |
1225 | ||
5e89c55e LP |
1226 | config ARM64_ACPI_PARKING_PROTOCOL |
1227 | bool "Enable support for the ARM64 ACPI parking protocol" | |
1228 | depends on ACPI | |
1229 | help | |
1230 | Enable support for the ARM64 ACPI parking protocol. If disabled | |
1231 | the kernel will not allow booting through the ARM64 ACPI parking | |
1232 | protocol even if the corresponding data is present in the ACPI | |
1233 | MADT table. | |
1234 | ||
8c2c3df3 CM |
1235 | config CMDLINE |
1236 | string "Default kernel command string" | |
1237 | default "" | |
1238 | help | |
1239 | Provide a set of default command-line options at build time by | |
1240 | entering them here. As a minimum, you should specify the the | |
1241 | root device (e.g. root=/dev/nfs). | |
1242 | ||
1243 | config CMDLINE_FORCE | |
1244 | bool "Always use the default kernel command string" | |
1245 | help | |
1246 | Always use the default kernel command string, even if the boot | |
1247 | loader passes other arguments to the kernel. | |
1248 | This is useful if you cannot or don't want to change the | |
1249 | command-line options your boot loader passes to the kernel. | |
1250 | ||
f4f75ad5 AB |
1251 | config EFI_STUB |
1252 | bool | |
1253 | ||
f84d0275 MS |
1254 | config EFI |
1255 | bool "UEFI runtime support" | |
1256 | depends on OF && !CPU_BIG_ENDIAN | |
b472db6c | 1257 | depends on KERNEL_MODE_NEON |
2c870e61 | 1258 | select ARCH_SUPPORTS_ACPI |
f84d0275 MS |
1259 | select LIBFDT |
1260 | select UCS2_STRING | |
1261 | select EFI_PARAMS_FROM_FDT | |
e15dd494 | 1262 | select EFI_RUNTIME_WRAPPERS |
f4f75ad5 AB |
1263 | select EFI_STUB |
1264 | select EFI_ARMSTUB | |
f84d0275 MS |
1265 | default y |
1266 | help | |
1267 | This option provides support for runtime services provided | |
1268 | by UEFI firmware (such as non-volatile variables, realtime | |
3c7f2550 MS |
1269 | clock, and platform reset). A UEFI stub is also provided to |
1270 | allow the kernel to be booted as an EFI application. This | |
1271 | is only useful on systems that have UEFI firmware. | |
f84d0275 | 1272 | |
d1ae8c00 YL |
1273 | config DMI |
1274 | bool "Enable support for SMBIOS (DMI) tables" | |
1275 | depends on EFI | |
1276 | default y | |
1277 | help | |
1278 | This enables SMBIOS/DMI feature for systems. | |
1279 | ||
1280 | This option is only useful on systems that have UEFI firmware. | |
1281 | However, even with this option, the resultant kernel should | |
1282 | continue to boot on existing non-UEFI platforms. | |
1283 | ||
8c2c3df3 CM |
1284 | endmenu |
1285 | ||
8c2c3df3 CM |
1286 | config COMPAT |
1287 | bool "Kernel support for 32-bit EL0" | |
755e70b7 | 1288 | depends on ARM64_4K_PAGES || EXPERT |
2e449048 | 1289 | select COMPAT_BINFMT_ELF if BINFMT_ELF |
af1839eb | 1290 | select HAVE_UID16 |
84b9e9b4 | 1291 | select OLD_SIGSUSPEND3 |
51682036 | 1292 | select COMPAT_OLD_SIGACTION |
8c2c3df3 CM |
1293 | help |
1294 | This option enables support for a 32-bit EL0 running under a 64-bit | |
1295 | kernel at EL1. AArch32-specific components such as system calls, | |
1296 | the user helper functions, VFP support and the ptrace interface are | |
1297 | handled appropriately by the kernel. | |
1298 | ||
44eaacf1 SP |
1299 | If you use a page size other than 4KB (i.e, 16KB or 64KB), please be aware |
1300 | that you will only be able to execute AArch32 binaries that were compiled | |
1301 | with page size aligned segments. | |
a8fcd8b1 | 1302 | |
8c2c3df3 CM |
1303 | If you want to execute 32-bit userspace applications, say Y. |
1304 | ||
1305 | config SYSVIPC_COMPAT | |
1306 | def_bool y | |
1307 | depends on COMPAT && SYSVIPC | |
1308 | ||
166936ba LP |
1309 | menu "Power management options" |
1310 | ||
1311 | source "kernel/power/Kconfig" | |
1312 | ||
82869ac5 JM |
1313 | config ARCH_HIBERNATION_POSSIBLE |
1314 | def_bool y | |
1315 | depends on CPU_PM | |
1316 | ||
1317 | config ARCH_HIBERNATION_HEADER | |
1318 | def_bool y | |
1319 | depends on HIBERNATION | |
1320 | ||
166936ba LP |
1321 | config ARCH_SUSPEND_POSSIBLE |
1322 | def_bool y | |
1323 | ||
166936ba LP |
1324 | endmenu |
1325 | ||
1307220d LP |
1326 | menu "CPU Power Management" |
1327 | ||
1328 | source "drivers/cpuidle/Kconfig" | |
1329 | ||
52e7e816 RH |
1330 | source "drivers/cpufreq/Kconfig" |
1331 | ||
1332 | endmenu | |
1333 | ||
f84d0275 MS |
1334 | source "drivers/firmware/Kconfig" |
1335 | ||
b6a02173 GG |
1336 | source "drivers/acpi/Kconfig" |
1337 | ||
c3eb5b14 MZ |
1338 | source "arch/arm64/kvm/Kconfig" |
1339 | ||
2c98833a AB |
1340 | if CRYPTO |
1341 | source "arch/arm64/crypto/Kconfig" | |
1342 | endif |