Commit | Line | Data |
---|---|---|
b2441318 | 1 | # SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | config MMU |
61d48c2c | 3 | def_bool y |
1da177e4 | 4 | |
66701b14 | 5 | config ZONE_DMA |
69dbb2f7 | 6 | def_bool y |
66701b14 | 7 | |
2fd92273 HC |
8 | config CPU_BIG_ENDIAN |
9 | def_bool y | |
10 | ||
2b105ff9 | 11 | config LOCKDEP_SUPPORT |
61d48c2c | 12 | def_bool y |
2b105ff9 | 13 | |
5bdc9b44 | 14 | config STACKTRACE_SUPPORT |
61d48c2c | 15 | def_bool y |
5bdc9b44 | 16 | |
f0d1b0b3 | 17 | config ARCH_HAS_ILOG2_U32 |
6f9a3c33 | 18 | def_bool n |
f0d1b0b3 DH |
19 | |
20 | config ARCH_HAS_ILOG2_U64 | |
6f9a3c33 | 21 | def_bool n |
f0d1b0b3 | 22 | |
7e33db4e | 23 | config GENERIC_HWEIGHT |
61d48c2c | 24 | def_bool y |
7e33db4e | 25 | |
c0007f1a | 26 | config GENERIC_BUG |
6f9a3c33 | 27 | def_bool y if BUG |
c0007f1a | 28 | |
52499f40 HC |
29 | config GENERIC_BUG_RELATIVE_POINTERS |
30 | def_bool y | |
31 | ||
b6b40c53 | 32 | config GENERIC_LOCKBREAK |
fa686453 | 33 | def_bool y if PREEMPTTION |
b6b40c53 | 34 | |
402b0862 | 35 | config PGSTE |
6f9a3c33 | 36 | def_bool y if KVM |
402b0862 | 37 | |
6a11f75b AM |
38 | config ARCH_SUPPORTS_DEBUG_PAGEALLOC |
39 | def_bool y | |
40 | ||
843c48fd JG |
41 | config AUDIT_ARCH |
42 | def_bool y | |
43 | ||
ce816fa8 | 44 | config NO_IOPORT_MAP |
c8717a3d JG |
45 | def_bool y |
46 | ||
47 | config PCI_QUIRKS | |
48 | def_bool n | |
49 | ||
2a0a5b22 | 50 | config ARCH_SUPPORTS_UPROBES |
5a79859a | 51 | def_bool y |
2a0a5b22 | 52 | |
5e785963 VG |
53 | config KASAN_SHADOW_OFFSET |
54 | hex | |
55 | depends on KASAN | |
5dff0381 | 56 | default 0x18000000000000 if KASAN_S390_4_LEVEL_PAGING |
5e785963 VG |
57 | default 0x30000000000 |
58 | ||
347a8dc3 | 59 | config S390 |
61d48c2c | 60 | def_bool y |
23fefe11 | 61 | select ARCH_BINFMT_ELF_STATE |
21266be9 | 62 | select ARCH_HAS_DEVMEM_IS_ALLOWED |
2b68f6ca | 63 | select ARCH_HAS_ELF_RANDOMIZE |
79962038 | 64 | select ARCH_HAS_FORTIFY_SOURCE |
957e3fac | 65 | select ARCH_HAS_GCOV_PROFILE_ALL |
4eb0716e | 66 | select ARCH_HAS_GIGANTIC_PAGE |
907fa061 | 67 | select ARCH_HAS_KCOV |
0c9c1d56 | 68 | select ARCH_HAS_MEM_ENCRYPT |
3010a5ea | 69 | select ARCH_HAS_PTE_SPECIAL |
d2852a22 | 70 | select ARCH_HAS_SET_MEMORY |
ad21fc4f LA |
71 | select ARCH_HAS_STRICT_KERNEL_RWX |
72 | select ARCH_HAS_STRICT_MODULE_RWX | |
aa0d6e70 | 73 | select ARCH_HAS_SYSCALL_WRAPPER |
c42d8c7d | 74 | select ARCH_HAS_UBSAN_SANITIZE_ALL |
0e0d04a8 | 75 | select ARCH_HAVE_NMI_SAFE_CMPXCHG |
6beb0009 TG |
76 | select ARCH_INLINE_READ_LOCK |
77 | select ARCH_INLINE_READ_LOCK_BH | |
78 | select ARCH_INLINE_READ_LOCK_IRQ | |
79 | select ARCH_INLINE_READ_LOCK_IRQSAVE | |
0e0d04a8 | 80 | select ARCH_INLINE_READ_TRYLOCK |
6beb0009 TG |
81 | select ARCH_INLINE_READ_UNLOCK |
82 | select ARCH_INLINE_READ_UNLOCK_BH | |
83 | select ARCH_INLINE_READ_UNLOCK_IRQ | |
84 | select ARCH_INLINE_READ_UNLOCK_IRQRESTORE | |
0e0d04a8 HC |
85 | select ARCH_INLINE_SPIN_LOCK |
86 | select ARCH_INLINE_SPIN_LOCK_BH | |
87 | select ARCH_INLINE_SPIN_LOCK_IRQ | |
88 | select ARCH_INLINE_SPIN_LOCK_IRQSAVE | |
89 | select ARCH_INLINE_SPIN_TRYLOCK | |
90 | select ARCH_INLINE_SPIN_TRYLOCK_BH | |
91 | select ARCH_INLINE_SPIN_UNLOCK | |
92 | select ARCH_INLINE_SPIN_UNLOCK_BH | |
93 | select ARCH_INLINE_SPIN_UNLOCK_IRQ | |
94 | select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE | |
6beb0009 TG |
95 | select ARCH_INLINE_WRITE_LOCK |
96 | select ARCH_INLINE_WRITE_LOCK_BH | |
97 | select ARCH_INLINE_WRITE_LOCK_IRQ | |
98 | select ARCH_INLINE_WRITE_LOCK_IRQSAVE | |
0e0d04a8 | 99 | select ARCH_INLINE_WRITE_TRYLOCK |
6beb0009 TG |
100 | select ARCH_INLINE_WRITE_UNLOCK |
101 | select ARCH_INLINE_WRITE_UNLOCK_BH | |
102 | select ARCH_INLINE_WRITE_UNLOCK_IRQ | |
103 | select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE | |
350e88ba | 104 | select ARCH_KEEP_MEMBLOCK |
e991e5bb | 105 | select ARCH_STACKWALK |
36e7fdaa | 106 | select ARCH_SUPPORTS_ATOMIC_RMW |
a763bc8b | 107 | select ARCH_SUPPORTS_NUMA_BALANCING |
295d8fa9 | 108 | select ARCH_USE_BUILTIN_BSWAP |
efc1d23b | 109 | select ARCH_USE_CMPXCHG_LOCKREF |
3f6813b9 | 110 | select ARCH_WANTS_DYNAMIC_TASK_STRUCT |
d2abfbe4 | 111 | select ARCH_WANT_DEFAULT_BPF_JIT |
c1d7e01d | 112 | select ARCH_WANT_IPC_PARSE_VERSION |
10916706 | 113 | select BUILDTIME_TABLE_SORT |
0e0d04a8 | 114 | select CLONE_BACKWARDS2 |
5d6a0163 | 115 | select DYNAMIC_FTRACE if FUNCTION_TRACER |
0e0d04a8 | 116 | select GENERIC_CLOCKEVENTS |
8f00b3e2 | 117 | select GENERIC_CPU_AUTOPROBE |
d424986f | 118 | select GENERIC_CPU_VULNERABILITIES |
746479cd | 119 | select GENERIC_FIND_FIRST_BIT |
e80e7813 | 120 | select GENERIC_SMP_IDLE_THREAD |
79c74ecb | 121 | select GENERIC_TIME_VSYSCALL |
0e0d04a8 | 122 | select HAVE_ALIGNED_STRUCT_PAGE if SLUB |
7a017721 | 123 | select HAVE_ARCH_AUDITSYSCALL |
5a79859a | 124 | select HAVE_ARCH_JUMP_LABEL |
13ddb52c | 125 | select HAVE_ARCH_JUMP_LABEL_RELATIVE |
42db5ed8 | 126 | select HAVE_ARCH_KASAN |
3e39ce26 | 127 | select HAVE_ARCH_KASAN_VMALLOC |
fff7fb0b | 128 | select CPU_NO_EFFICIENT_FFS if !HAVE_MARCH_Z9_109_FEATURES |
c63cb468 | 129 | select HAVE_ARCH_SECCOMP_FILTER |
5614dd92 | 130 | select HAVE_ARCH_SOFT_DIRTY |
0e0d04a8 | 131 | select HAVE_ARCH_TRACEHOOK |
5a79859a | 132 | select HAVE_ARCH_TRANSPARENT_HUGEPAGE |
ce3dc447 | 133 | select HAVE_ARCH_VMAP_STACK |
2ff2b7ec | 134 | select HAVE_ASM_MODVERSIONS |
6077776b | 135 | select HAVE_EBPF_JIT if PACK_STACK && HAVE_MARCH_Z196_FEATURES |
0e0d04a8 HC |
136 | select HAVE_CMPXCHG_DOUBLE |
137 | select HAVE_CMPXCHG_LOCAL | |
f50c0e63 | 138 | select HAVE_COPY_THREAD_TLS |
0e0d04a8 | 139 | select HAVE_DEBUG_KMEMLEAK |
e1231b0e | 140 | select HAVE_DMA_CONTIGUOUS |
5a79859a HC |
141 | select HAVE_DYNAMIC_FTRACE |
142 | select HAVE_DYNAMIC_FTRACE_WITH_REGS | |
67a929e0 | 143 | select HAVE_FAST_GUP |
9078a549 | 144 | select HAVE_EFFICIENT_UNALIGNED_ACCESS |
d983c89c | 145 | select HAVE_FENTRY |
0e0d04a8 | 146 | select HAVE_FTRACE_MCOUNT_RECORD |
5a79859a HC |
147 | select HAVE_FUNCTION_GRAPH_TRACER |
148 | select HAVE_FUNCTION_TRACER | |
03b8c7b6 | 149 | select HAVE_FUTEX_CMPXCHG if FUTEX |
bc00b3ec | 150 | select HAVE_GCC_PLUGINS |
0e0d04a8 HC |
151 | select HAVE_KERNEL_BZIP2 |
152 | select HAVE_KERNEL_GZIP | |
8e2872ce | 153 | select HAVE_KERNEL_LZ4 |
0e0d04a8 HC |
154 | select HAVE_KERNEL_LZMA |
155 | select HAVE_KERNEL_LZO | |
89b5202e | 156 | select HAVE_KERNEL_UNCOMPRESSED |
0e0d04a8 HC |
157 | select HAVE_KERNEL_XZ |
158 | select HAVE_KPROBES | |
657480d9 | 159 | select HAVE_KPROBES_ON_FTRACE |
0e0d04a8 | 160 | select HAVE_KRETPROBES |
5a79859a | 161 | select HAVE_KVM |
21042d43 | 162 | select HAVE_LIVEPATCH |
c33eff60 HC |
163 | select HAVE_PERF_REGS |
164 | select HAVE_PERF_USER_STACK_DUMP | |
50be6345 | 165 | select HAVE_MEMBLOCK_PHYS_MAP |
580a586c | 166 | select MMU_GATHER_NO_GATHER |
786d35d4 | 167 | select HAVE_MOD_ARCH_SPECIFIC |
d983c89c | 168 | select HAVE_NOP_MCOUNT |
0e0d04a8 | 169 | select HAVE_OPROFILE |
eb01d42a | 170 | select HAVE_PCI |
0e0d04a8 | 171 | select HAVE_PERF_EVENTS |
ff2e6d72 | 172 | select MMU_GATHER_RCU_TABLE_FREE |
0e0d04a8 | 173 | select HAVE_REGS_AND_STACK_ACCESS_API |
aa137a6d | 174 | select HAVE_RELIABLE_STACKTRACE |
9d6d99e3 | 175 | select HAVE_RSEQ |
0e0d04a8 | 176 | select HAVE_SYSCALL_TRACEPOINTS |
0e0d04a8 | 177 | select HAVE_VIRT_CPU_ACCOUNTING |
eb01d42a CH |
178 | select IOMMU_HELPER if PCI |
179 | select IOMMU_SUPPORT if PCI | |
786d35d4 | 180 | select MODULES_USE_ELF_RELA |
eb01d42a CH |
181 | select NEED_DMA_MAP_STATE if PCI |
182 | select NEED_SG_DMA_LENGTH if PCI | |
7eddd99c | 183 | select OLD_SIGACTION |
93bead43 | 184 | select OLD_SIGSUSPEND3 |
2eac9c2d | 185 | select PCI_DOMAINS if PCI |
eb01d42a | 186 | select PCI_MSI if PCI |
bb98f396 | 187 | select SPARSE_IRQ |
0e0d04a8 | 188 | select SYSCTL_EXCEPTION_TRACE |
d5c352cd | 189 | select THREAD_INFO_IN_TASK |
0563416b | 190 | select TTY |
0e0d04a8 | 191 | select VIRT_CPU_ACCOUNTING |
40565b5a | 192 | select ARCH_HAS_SCALED_CPUTIME |
42a0bb3f | 193 | select HAVE_NMI |
9087c375 | 194 | select ARCH_HAS_FORCE_DMA_UNENCRYPTED |
64e1f0c5 | 195 | select SWIOTLB |
bb99332a | 196 | select GENERIC_ALLOCATOR |
9e2b4be3 | 197 | imply IMA_SECURE_AND_OR_TRUSTED_BOOT |
3a368f74 | 198 | |
1da177e4 | 199 | |
fca3e357 | 200 | config SCHED_OMIT_FRAME_POINTER |
6f9a3c33 | 201 | def_bool y |
fca3e357 | 202 | |
c81956c9 KS |
203 | config PGTABLE_LEVELS |
204 | int | |
1aea9b3f | 205 | default 5 |
c81956c9 | 206 | |
21042d43 JS |
207 | source "kernel/livepatch/Kconfig" |
208 | ||
843c48fd JG |
209 | menu "Processor type and features" |
210 | ||
211 | config HAVE_MARCH_Z900_FEATURES | |
212 | def_bool n | |
213 | ||
214 | config HAVE_MARCH_Z990_FEATURES | |
215 | def_bool n | |
216 | select HAVE_MARCH_Z900_FEATURES | |
217 | ||
218 | config HAVE_MARCH_Z9_109_FEATURES | |
219 | def_bool n | |
220 | select HAVE_MARCH_Z990_FEATURES | |
221 | ||
222 | config HAVE_MARCH_Z10_FEATURES | |
223 | def_bool n | |
224 | select HAVE_MARCH_Z9_109_FEATURES | |
225 | ||
226 | config HAVE_MARCH_Z196_FEATURES | |
227 | def_bool n | |
228 | select HAVE_MARCH_Z10_FEATURES | |
229 | ||
991c1505 HC |
230 | config HAVE_MARCH_ZEC12_FEATURES |
231 | def_bool n | |
232 | select HAVE_MARCH_Z196_FEATURES | |
233 | ||
f8b2dcbd MS |
234 | config HAVE_MARCH_Z13_FEATURES |
235 | def_bool n | |
236 | select HAVE_MARCH_ZEC12_FEATURES | |
237 | ||
6997c323 MS |
238 | config HAVE_MARCH_Z14_FEATURES |
239 | def_bool n | |
240 | select HAVE_MARCH_Z13_FEATURES | |
241 | ||
a0e22511 MS |
242 | config HAVE_MARCH_Z15_FEATURES |
243 | def_bool n | |
244 | select HAVE_MARCH_Z14_FEATURES | |
245 | ||
843c48fd JG |
246 | choice |
247 | prompt "Processor type" | |
7072276e | 248 | default MARCH_Z196 |
1da177e4 | 249 | |
843c48fd JG |
250 | config MARCH_Z900 |
251 | bool "IBM zSeries model z800 and z900" | |
5a79859a | 252 | select HAVE_MARCH_Z900_FEATURES |
5474080a | 253 | depends on $(cc-option,-march=z900) |
843c48fd JG |
254 | help |
255 | Select this to enable optimizations for model z800/z900 (2064 and | |
256 | 2066 series). This will enable some optimizations that are not | |
257 | available on older ESA/390 (31 Bit) only CPUs. | |
258 | ||
259 | config MARCH_Z990 | |
260 | bool "IBM zSeries model z890 and z990" | |
5a79859a | 261 | select HAVE_MARCH_Z990_FEATURES |
5474080a | 262 | depends on $(cc-option,-march=z990) |
843c48fd JG |
263 | help |
264 | Select this to enable optimizations for model z890/z990 (2084 and | |
265 | 2086 series). The kernel will be slightly faster but will not work | |
266 | on older machines. | |
267 | ||
268 | config MARCH_Z9_109 | |
269 | bool "IBM System z9" | |
5a79859a | 270 | select HAVE_MARCH_Z9_109_FEATURES |
5474080a | 271 | depends on $(cc-option,-march=z9-109) |
843c48fd JG |
272 | help |
273 | Select this to enable optimizations for IBM System z9 (2094 and | |
274 | 2096 series). The kernel will be slightly faster but will not work | |
275 | on older machines. | |
276 | ||
277 | config MARCH_Z10 | |
278 | bool "IBM System z10" | |
5a79859a | 279 | select HAVE_MARCH_Z10_FEATURES |
5474080a | 280 | depends on $(cc-option,-march=z10) |
843c48fd JG |
281 | help |
282 | Select this to enable optimizations for IBM System z10 (2097 and | |
283 | 2098 series). The kernel will be slightly faster but will not work | |
284 | on older machines. | |
285 | ||
286 | config MARCH_Z196 | |
287 | bool "IBM zEnterprise 114 and 196" | |
5a79859a | 288 | select HAVE_MARCH_Z196_FEATURES |
5474080a | 289 | depends on $(cc-option,-march=z196) |
843c48fd JG |
290 | help |
291 | Select this to enable optimizations for IBM zEnterprise 114 and 196 | |
292 | (2818 and 2817 series). The kernel will be slightly faster but will | |
293 | not work on older machines. | |
1da177e4 | 294 | |
991c1505 | 295 | config MARCH_ZEC12 |
59471227 | 296 | bool "IBM zBC12 and zEC12" |
5a79859a | 297 | select HAVE_MARCH_ZEC12_FEATURES |
5474080a | 298 | depends on $(cc-option,-march=zEC12) |
991c1505 | 299 | help |
59471227 HC |
300 | Select this to enable optimizations for IBM zBC12 and zEC12 (2828 and |
301 | 2827 series). The kernel will be slightly faster but will not work on | |
302 | older machines. | |
991c1505 | 303 | |
f8b2dcbd | 304 | config MARCH_Z13 |
bb3aa614 | 305 | bool "IBM z13s and z13" |
5a79859a | 306 | select HAVE_MARCH_Z13_FEATURES |
5474080a | 307 | depends on $(cc-option,-march=z13) |
f8b2dcbd | 308 | help |
bb3aa614 HC |
309 | Select this to enable optimizations for IBM z13s and z13 (2965 and |
310 | 2964 series). The kernel will be slightly faster but will not work on | |
311 | older machines. | |
f8b2dcbd | 312 | |
6997c323 | 313 | config MARCH_Z14 |
451239eb | 314 | bool "IBM z14 ZR1 and z14" |
6997c323 | 315 | select HAVE_MARCH_Z14_FEATURES |
5474080a | 316 | depends on $(cc-option,-march=z14) |
6997c323 | 317 | help |
451239eb HC |
318 | Select this to enable optimizations for IBM z14 ZR1 and z14 (3907 |
319 | and 3906 series). The kernel will be slightly faster but will not | |
320 | work on older machines. | |
6997c323 | 321 | |
a0e22511 MS |
322 | config MARCH_Z15 |
323 | bool "IBM z15" | |
324 | select HAVE_MARCH_Z15_FEATURES | |
5474080a | 325 | depends on $(cc-option,-march=z15) |
a0e22511 MS |
326 | help |
327 | Select this to enable optimizations for IBM z15 (8562 | |
328 | and 8561 series). The kernel will be slightly faster but will not | |
329 | work on older machines. | |
330 | ||
843c48fd | 331 | endchoice |
1da177e4 | 332 | |
1db9e051 HC |
333 | config MARCH_Z900_TUNE |
334 | def_bool TUNE_Z900 || MARCH_Z900 && TUNE_DEFAULT | |
335 | ||
336 | config MARCH_Z990_TUNE | |
337 | def_bool TUNE_Z990 || MARCH_Z990 && TUNE_DEFAULT | |
338 | ||
339 | config MARCH_Z9_109_TUNE | |
340 | def_bool TUNE_Z9_109 || MARCH_Z9_109 && TUNE_DEFAULT | |
341 | ||
342 | config MARCH_Z10_TUNE | |
343 | def_bool TUNE_Z10 || MARCH_Z10 && TUNE_DEFAULT | |
344 | ||
345 | config MARCH_Z196_TUNE | |
346 | def_bool TUNE_Z196 || MARCH_Z196 && TUNE_DEFAULT | |
347 | ||
348 | config MARCH_ZEC12_TUNE | |
349 | def_bool TUNE_ZEC12 || MARCH_ZEC12 && TUNE_DEFAULT | |
350 | ||
f8b2dcbd MS |
351 | config MARCH_Z13_TUNE |
352 | def_bool TUNE_Z13 || MARCH_Z13 && TUNE_DEFAULT | |
353 | ||
6997c323 MS |
354 | config MARCH_Z14_TUNE |
355 | def_bool TUNE_Z14 || MARCH_Z14 && TUNE_DEFAULT | |
356 | ||
a0e22511 MS |
357 | config MARCH_Z15_TUNE |
358 | def_bool TUNE_Z15 || MARCH_Z15 && TUNE_DEFAULT | |
359 | ||
1db9e051 HC |
360 | choice |
361 | prompt "Tune code generation" | |
362 | default TUNE_DEFAULT | |
363 | help | |
364 | Cause the compiler to tune (-mtune) the generated code for a machine. | |
365 | This will make the code run faster on the selected machine but | |
366 | somewhat slower on other machines. | |
367 | This option only changes how the compiler emits instructions, not the | |
368 | selection of instructions itself, so the resulting kernel will run on | |
369 | all other machines. | |
370 | ||
371 | config TUNE_DEFAULT | |
372 | bool "Default" | |
373 | help | |
374 | Tune the generated code for the target processor for which the kernel | |
375 | will be compiled. | |
376 | ||
1db9e051 HC |
377 | config TUNE_Z900 |
378 | bool "IBM zSeries model z800 and z900" | |
5474080a | 379 | depends on $(cc-option,-mtune=z900) |
1db9e051 HC |
380 | |
381 | config TUNE_Z990 | |
382 | bool "IBM zSeries model z890 and z990" | |
5474080a | 383 | depends on $(cc-option,-mtune=z990) |
1db9e051 HC |
384 | |
385 | config TUNE_Z9_109 | |
386 | bool "IBM System z9" | |
5474080a | 387 | depends on $(cc-option,-mtune=z9-109) |
1db9e051 HC |
388 | |
389 | config TUNE_Z10 | |
390 | bool "IBM System z10" | |
5474080a | 391 | depends on $(cc-option,-mtune=z10) |
1db9e051 HC |
392 | |
393 | config TUNE_Z196 | |
394 | bool "IBM zEnterprise 114 and 196" | |
5474080a | 395 | depends on $(cc-option,-mtune=z196) |
1db9e051 HC |
396 | |
397 | config TUNE_ZEC12 | |
398 | bool "IBM zBC12 and zEC12" | |
5474080a | 399 | depends on $(cc-option,-mtune=zEC12) |
1db9e051 | 400 | |
f8b2dcbd | 401 | config TUNE_Z13 |
89d0180a | 402 | bool "IBM z13s and z13" |
5474080a | 403 | depends on $(cc-option,-mtune=z13) |
f8b2dcbd | 404 | |
6997c323 | 405 | config TUNE_Z14 |
89d0180a | 406 | bool "IBM z14 ZR1 and z14" |
5474080a | 407 | depends on $(cc-option,-mtune=z14) |
6997c323 | 408 | |
a0e22511 MS |
409 | config TUNE_Z15 |
410 | bool "IBM z15" | |
5474080a | 411 | depends on $(cc-option,-mtune=z15) |
a0e22511 | 412 | |
1db9e051 HC |
413 | endchoice |
414 | ||
347a8dc3 | 415 | config 64BIT |
6f9a3c33 | 416 | def_bool y |
d9f7a745 | 417 | |
843c48fd JG |
418 | config COMPAT |
419 | def_bool y | |
420 | prompt "Kernel support for 31 bit emulation" | |
843c48fd JG |
421 | select COMPAT_BINFMT_ELF if BINFMT_ELF |
422 | select ARCH_WANT_OLD_COMPAT_IPC | |
7eddd99c | 423 | select COMPAT_OLD_SIGACTION |
fef747ba | 424 | select HAVE_UID16 |
2813893f | 425 | depends on MULTIUSER |
843c48fd JG |
426 | help |
427 | Select this option if you want to enable your system kernel to | |
428 | handle system-calls from ELF binaries for 31 bit ESA. This option | |
429 | (and some other stuff like libraries and such) is needed for | |
430 | executing 31 bit applications. It is safe to say "Y". | |
431 | ||
432 | config SYSVIPC_COMPAT | |
433 | def_bool y if COMPAT && SYSVIPC | |
434 | ||
1da177e4 | 435 | config SMP |
6f9a3c33 | 436 | def_bool y |
1da177e4 LT |
437 | |
438 | config NR_CPUS | |
5c75a0da HC |
439 | int "Maximum number of CPUs (2-512)" |
440 | range 2 512 | |
5a79859a | 441 | default "64" |
1da177e4 LT |
442 | help |
443 | This allows you to specify the maximum number of CPUs which this | |
5c75a0da | 444 | kernel will support. The maximum supported value is 512 and the |
1da177e4 LT |
445 | minimum value which makes sense is 2. |
446 | ||
447 | This is purely to save memory - each supported CPU adds | |
448 | approximately sixteen kilobytes to the kernel image. | |
449 | ||
450 | config HOTPLUG_CPU | |
6f9a3c33 | 451 | def_bool y |
1da177e4 | 452 | |
3a368f74 PH |
453 | config NUMA |
454 | bool "NUMA support" | |
67626fad | 455 | depends on SCHED_TOPOLOGY |
3a368f74 PH |
456 | default n |
457 | help | |
458 | Enable NUMA support | |
459 | ||
460 | This option adds NUMA support to the kernel. | |
461 | ||
3a368f74 | 462 | config NODES_SHIFT |
701dc81e HC |
463 | int |
464 | default "1" | |
9236b4dd HC |
465 | |
466 | config SCHED_SMT | |
467 | def_bool n | |
c29a7baf | 468 | |
8d11e021 | 469 | config SCHED_MC |
83a24e32 | 470 | def_bool n |
8d11e021 | 471 | |
4cb14bc8 | 472 | config SCHED_BOOK |
10ad34bc MS |
473 | def_bool n |
474 | ||
adac0f1e HC |
475 | config SCHED_DRAWER |
476 | def_bool n | |
477 | ||
10ad34bc | 478 | config SCHED_TOPOLOGY |
6f9a3c33 | 479 | def_bool y |
10ad34bc | 480 | prompt "Topology scheduler support" |
10ad34bc | 481 | select SCHED_SMT |
83a24e32 | 482 | select SCHED_MC |
10ad34bc | 483 | select SCHED_BOOK |
adac0f1e | 484 | select SCHED_DRAWER |
4cb14bc8 | 485 | help |
10ad34bc MS |
486 | Topology scheduler support improves the CPU scheduler's decision |
487 | making when dealing with machines that have multi-threading, | |
488 | multiple cores or multiple books. | |
4cb14bc8 | 489 | |
8636a1f9 | 490 | source "kernel/Kconfig.hz" |
1da177e4 | 491 | |
bdea9f6f PR |
492 | config KEXEC |
493 | def_bool y | |
494 | select KEXEC_CORE | |
495 | ||
496 | config KEXEC_FILE | |
497 | bool "kexec file based system call" | |
498 | select KEXEC_CORE | |
499 | select BUILD_BIN2C | |
500 | depends on CRYPTO | |
501 | depends on CRYPTO_SHA256 | |
502 | depends on CRYPTO_SHA256_S390 | |
503 | help | |
504 | Enable the kexec file based system call. In contrast to the normal | |
505 | kexec system call this system call takes file descriptors for the | |
506 | kernel and initramfs as arguments. | |
507 | ||
508 | config ARCH_HAS_KEXEC_PURGATORY | |
509 | def_bool y | |
510 | depends on KEXEC_FILE | |
511 | ||
99d5cadf | 512 | config KEXEC_SIG |
e23a8020 | 513 | bool "Verify kernel signature during kexec_file_load() syscall" |
c8424e77 | 514 | depends on KEXEC_FILE && MODULE_SIG_FORMAT |
e23a8020 PR |
515 | help |
516 | This option makes kernel signature verification mandatory for | |
517 | the kexec_file_load() syscall. | |
518 | ||
519 | In addition to that option, you need to enable signature | |
520 | verification for the corresponding kernel image type being | |
521 | loaded in order for this to work. | |
522 | ||
4c637cd8 HF |
523 | config ARCH_RANDOM |
524 | def_bool y | |
525 | prompt "s390 architectural random number generation API" | |
526 | help | |
527 | Enable the s390 architectural random number generation API | |
528 | to provide random data for all consumers within the Linux | |
529 | kernel. | |
530 | ||
531 | When enabled the arch_random_* functions declared in linux/random.h | |
532 | are implemented. The implementation is based on the s390 CPACF | |
533 | instruction subfunction TRNG which provides a real true random | |
534 | number generator. | |
535 | ||
536 | If unsure, say Y. | |
537 | ||
d768bd89 MS |
538 | config KERNEL_NOBP |
539 | def_bool n | |
540 | prompt "Enable modified branch prediction for the kernel by default" | |
541 | help | |
542 | If this option is selected the kernel will switch to a modified | |
543 | branch prediction mode if the firmware interface is available. | |
544 | The modified branch prediction mode improves the behaviour in | |
545 | regard to speculative execution. | |
546 | ||
547 | With the option enabled the kernel parameter "nobp=0" or "nospec" | |
548 | can be used to run the kernel in the normal branch prediction mode. | |
549 | ||
550 | With the option disabled the modified branch prediction mode is | |
551 | enabled with the "nobp=1" kernel parameter. | |
552 | ||
553 | If unsure, say N. | |
554 | ||
f19fbd5e MS |
555 | config EXPOLINE |
556 | def_bool n | |
557 | prompt "Avoid speculative indirect branches in the kernel" | |
558 | help | |
559 | Compile the kernel with the expoline compiler options to guard | |
560 | against kernel-to-user data leaks by avoiding speculative indirect | |
561 | branches. | |
562 | Requires a compiler with -mindirect-branch=thunk support for full | |
563 | protection. The kernel may run slower. | |
564 | ||
565 | If unsure, say N. | |
566 | ||
567 | choice | |
568 | prompt "Expoline default" | |
569 | depends on EXPOLINE | |
570 | default EXPOLINE_FULL | |
571 | ||
572 | config EXPOLINE_OFF | |
573 | bool "spectre_v2=off" | |
574 | ||
6e179d64 | 575 | config EXPOLINE_AUTO |
f19fbd5e MS |
576 | bool "spectre_v2=auto" |
577 | ||
578 | config EXPOLINE_FULL | |
579 | bool "spectre_v2=on" | |
580 | ||
581 | endchoice | |
582 | ||
805bc0bc GS |
583 | config RELOCATABLE |
584 | bool "Build a relocatable kernel" | |
585 | select MODULE_REL_CRCS if MODVERSIONS | |
586 | default y | |
587 | help | |
588 | This builds a kernel image that retains relocation information | |
589 | so it can be loaded at an arbitrary address. | |
590 | The kernel is linked as a position-independent executable (PIE) | |
591 | and contains dynamic relocations which are processed early in the | |
592 | bootup process. | |
593 | The relocations make the kernel image about 15% larger (compressed | |
594 | 10%), but are discarded at runtime. | |
595 | ||
b2d24b97 GS |
596 | config RANDOMIZE_BASE |
597 | bool "Randomize the address of the kernel image (KASLR)" | |
598 | depends on RELOCATABLE | |
599 | default y | |
600 | help | |
601 | In support of Kernel Address Space Layout Randomization (KASLR), | |
602 | this randomizes the address at which the kernel image is loaded, | |
603 | as a security feature that deters exploit attempts relying on | |
604 | knowledge of the location of kernel internals. | |
605 | ||
843c48fd | 606 | endmenu |
1da177e4 | 607 | |
843c48fd | 608 | menu "Memory setup" |
1d057720 | 609 | |
843c48fd | 610 | config ARCH_SPARSEMEM_ENABLE |
6f9a3c33 | 611 | def_bool y |
843c48fd JG |
612 | select SPARSEMEM_VMEMMAP_ENABLE |
613 | select SPARSEMEM_VMEMMAP | |
e65e1fc2 | 614 | |
843c48fd JG |
615 | config ARCH_SPARSEMEM_DEFAULT |
616 | def_bool y | |
1da177e4 | 617 | |
843c48fd JG |
618 | config ARCH_ENABLE_MEMORY_HOTPLUG |
619 | def_bool y if SPARSEMEM | |
0efa4703 | 620 | |
843c48fd JG |
621 | config ARCH_ENABLE_MEMORY_HOTREMOVE |
622 | def_bool y | |
e37f50e1 | 623 | |
ec66ad66 MS |
624 | config ARCH_ENABLE_SPLIT_PMD_PTLOCK |
625 | def_bool y | |
ec66ad66 | 626 | |
843c48fd JG |
627 | config FORCE_MAX_ZONEORDER |
628 | int | |
629 | default "9" | |
f861e405 | 630 | |
b8402b95 HC |
631 | config MAX_PHYSMEM_BITS |
632 | int "Maximum size of supported physical memory in bits (42-53)" | |
633 | range 42 53 | |
634 | default "46" | |
635 | help | |
636 | This option specifies the maximum supported size of physical memory | |
637 | in bits. Supported is any size between 2^42 (4TB) and 2^53 (8PB). | |
638 | Increasing the number of bits also increases the kernel image size. | |
639 | By default 46 bits (64TB) are supported. | |
640 | ||
1da177e4 | 641 | config PACK_STACK |
6f9a3c33 MS |
642 | def_bool y |
643 | prompt "Pack kernel stack" | |
1da177e4 LT |
644 | help |
645 | This option enables the compiler option -mkernel-backchain if it | |
646 | is available. If the option is available the compiler supports | |
647 | the new stack layout which dramatically reduces the minimum stack | |
648 | frame size. With an old compiler a non-leaf function needs a | |
649 | minimum of 96 bytes on 31 bit and 160 bytes on 64 bit. With | |
650 | -mkernel-backchain the minimum size drops to 16 byte on 31 bit | |
651 | and 24 byte on 64 bit. | |
652 | ||
653 | Say Y if you are unsure. | |
654 | ||
1da177e4 | 655 | config CHECK_STACK |
6f9a3c33 | 656 | def_bool y |
ce3dc447 | 657 | depends on !VMAP_STACK |
6f9a3c33 | 658 | prompt "Detect kernel stack overflow" |
1da177e4 LT |
659 | help |
660 | This option enables the compiler option -mstack-guard and | |
661 | -mstack-size if they are available. If the compiler supports them | |
662 | it will emit additional code to each function prolog to trigger | |
663 | an illegal operation if the kernel stack is about to overflow. | |
664 | ||
665 | Say N if you are unsure. | |
666 | ||
667 | config STACK_GUARD | |
668 | int "Size of the guard area (128-1024)" | |
669 | range 128 1024 | |
670 | depends on CHECK_STACK | |
671 | default "256" | |
672 | help | |
673 | This allows you to specify the size of the guard area at the lower | |
674 | end of the kernel stack. If the kernel stack points into the guard | |
675 | area on function entry an illegal operation is triggered. The size | |
676 | needs to be a power of 2. Please keep in mind that the size of an | |
677 | interrupt frame is 184 bytes for 31 bit and 328 bytes on 64 bit. | |
678 | The minimum size for the stack guard should be 256 for 31 bit and | |
679 | 512 for 64 bit. | |
680 | ||
2c190da4 | 681 | config WARN_DYNAMIC_STACK |
6f9a3c33 | 682 | def_bool n |
2c190da4 | 683 | prompt "Emit compiler warnings for function with dynamic stack usage" |
1da177e4 | 684 | help |
2c190da4 JG |
685 | This option enables the compiler option -mwarn-dynamicstack. If the |
686 | compiler supports this options generates warnings for functions | |
687 | that dynamically allocate stack space using alloca. | |
1da177e4 LT |
688 | |
689 | Say N if you are unsure. | |
690 | ||
843c48fd | 691 | endmenu |
3f22ab27 | 692 | |
843c48fd | 693 | menu "I/O subsystem" |
1da177e4 | 694 | |
1da177e4 | 695 | config QDIO |
6f9a3c33 MS |
696 | def_tristate y |
697 | prompt "QDIO support" | |
1da177e4 | 698 | ---help--- |
8129ee16 | 699 | This driver provides the Queued Direct I/O base support for |
efca13bc | 700 | IBM System z. |
1da177e4 LT |
701 | |
702 | To compile this driver as a module, choose M here: the | |
703 | module will be called qdio. | |
704 | ||
705 | If unsure, say Y. | |
706 | ||
c8717a3d JG |
707 | if PCI |
708 | ||
709 | config PCI_NR_FUNCTIONS | |
710 | int "Maximum number of PCI functions (1-4096)" | |
711 | range 1 4096 | |
b18601b0 | 712 | default "128" |
c8717a3d JG |
713 | help |
714 | This allows you to specify the maximum number of PCI functions which | |
715 | this kernel will support. | |
716 | ||
8b96d971 | 717 | endif # PCI |
c8717a3d | 718 | |
c8717a3d JG |
719 | config HAS_IOMEM |
720 | def_bool PCI | |
721 | ||
9d92a7e1 | 722 | config CHSC_SCH |
d9c11b1e | 723 | def_tristate m |
6f9a3c33 | 724 | prompt "Support for CHSC subchannels" |
9d92a7e1 CH |
725 | help |
726 | This driver allows usage of CHSC subchannels. A CHSC subchannel | |
727 | is usually present on LPAR only. | |
728 | The driver creates a device /dev/chsc, which may be used to | |
729 | obtain I/O configuration information about the machine and | |
730 | to issue asynchronous chsc commands (DANGEROUS). | |
731 | You will usually only want to use this interface on a special | |
732 | LPAR designated for system management. | |
733 | ||
734 | To compile this driver as a module, choose M here: the | |
735 | module will be called chsc_sch. | |
736 | ||
737 | If unsure, say N. | |
738 | ||
1d1c8f78 SO |
739 | config SCM_BUS |
740 | def_bool y | |
1d1c8f78 SO |
741 | prompt "SCM bus driver" |
742 | help | |
743 | Bus driver for Storage Class Memory. | |
744 | ||
eadb86ab SO |
745 | config EADM_SCH |
746 | def_tristate m | |
747 | prompt "Support for EADM subchannels" | |
748 | depends on SCM_BUS | |
749 | help | |
750 | This driver allows usage of EADM subchannels. EADM subchannels act | |
751 | as a communication vehicle for SCM increments. | |
752 | ||
753 | To compile this driver as a module, choose M here: the | |
754 | module will be called eadm_sch. | |
755 | ||
63f1934d DJS |
756 | config VFIO_CCW |
757 | def_tristate n | |
758 | prompt "Support for VFIO-CCW subchannels" | |
84cd8fc4 | 759 | depends on S390_CCW_IOMMU && VFIO_MDEV |
63f1934d DJS |
760 | help |
761 | This driver allows usage of I/O subchannels via VFIO-CCW. | |
762 | ||
763 | To compile this driver as a module, choose M here: the | |
764 | module will be called vfio_ccw. | |
765 | ||
1fde5734 TK |
766 | config VFIO_AP |
767 | def_tristate n | |
768 | prompt "VFIO support for AP devices" | |
769 | depends on S390_AP_IOMMU && VFIO_MDEV_DEVICE && KVM | |
770 | help | |
771 | This driver grants access to Adjunct Processor (AP) devices | |
772 | via the VFIO mediated device interface. | |
773 | ||
774 | To compile this driver as a module, choose M here: the module | |
775 | will be called vfio_ap. | |
776 | ||
843c48fd JG |
777 | endmenu |
778 | ||
779 | menu "Dump support" | |
780 | ||
781 | config CRASH_DUMP | |
782 | bool "kernel crash dumps" | |
843c48fd JG |
783 | select KEXEC |
784 | help | |
785 | Generate crash dump after being started by kexec. | |
786 | Crash dump kernels are loaded in the main kernel with kexec-tools | |
787 | into a specially reserved region and then later executed after | |
788 | a crash by kdump/kexec. | |
8b4a503d | 789 | Refer to <file:Documentation/s390/zfcpdump.rst> for more details on this. |
bf28a597 | 790 | This option also enables s390 zfcpdump. |
8b4a503d | 791 | See also <file:Documentation/s390/zfcpdump.rst> |
843c48fd JG |
792 | |
793 | endmenu | |
794 | ||
843c48fd JG |
795 | config SECCOMP |
796 | def_bool y | |
797 | prompt "Enable seccomp to safely compute untrusted bytecode" | |
798 | depends on PROC_FS | |
799 | help | |
800 | This kernel feature is useful for number crunching applications | |
801 | that may need to compute untrusted bytecode during their | |
802 | execution. By using pipes or other transports made available to | |
803 | the process as file descriptors supporting the read/write | |
804 | syscalls, it's possible to isolate those applications in | |
805 | their own address space using seccomp. Once seccomp is | |
806 | enabled via /proc/<pid>/seccomp, it cannot be disabled | |
807 | and the task is only allowed to execute a few safe syscalls | |
808 | defined by each seccomp mode. | |
809 | ||
810 | If unsure, say Y. | |
811 | ||
843c48fd JG |
812 | config CCW |
813 | def_bool y | |
814 | ||
b6ef86e9 UB |
815 | config HAVE_PNETID |
816 | tristate | |
817 | default (SMC || CCWGROUP) | |
818 | ||
843c48fd | 819 | menu "Virtualization" |
684de39b | 820 | |
5abb9351 VG |
821 | config PROTECTED_VIRTUALIZATION_GUEST |
822 | def_bool n | |
823 | prompt "Protected virtualization guest support" | |
824 | help | |
825 | Select this option, if you want to be able to run this | |
826 | kernel as a protected virtualization KVM guest. | |
827 | Protected virtualization capable machines have a mini hypervisor | |
828 | located at machine level (an ultravisor). With help of the | |
829 | Ultravisor, KVM will be able to run "protected" VMs, special | |
830 | VMs whose memory and management data are unavailable to KVM. | |
831 | ||
1da177e4 | 832 | config PFAULT |
6f9a3c33 MS |
833 | def_bool y |
834 | prompt "Pseudo page fault support" | |
1da177e4 LT |
835 | help |
836 | Select this option, if you want to use PFAULT pseudo page fault | |
837 | handling under VM. If running native or in LPAR, this option | |
838 | has no effect. If your VM does not support PFAULT, PAGEEX | |
839 | pseudo page fault handling will be used. | |
840 | Note that VM 4.2 supports PFAULT but has a bug in its | |
841 | implementation that causes some problems. | |
842 | Everybody who wants to run Linux under VM != VM4.2 should select | |
843 | this option. | |
844 | ||
1da177e4 | 845 | config CMM |
6f9a3c33 MS |
846 | def_tristate n |
847 | prompt "Cooperative memory management" | |
1da177e4 LT |
848 | help |
849 | Select this option, if you want to enable the kernel interface | |
850 | to reduce the memory size of the system. This is accomplished | |
851 | by allocating pages of memory and put them "on hold". This only | |
852 | makes sense for a system running under VM where the unused pages | |
853 | will be reused by VM for other guest systems. The interface | |
854 | allows an external monitor to balance memory of many systems. | |
855 | Everybody who wants to run Linux under VM should select this | |
856 | option. | |
857 | ||
1da177e4 | 858 | config CMM_IUCV |
6f9a3c33 MS |
859 | def_bool y |
860 | prompt "IUCV special message interface to cooperative memory management" | |
1da177e4 LT |
861 | depends on CMM && (SMSGIUCV=y || CMM=SMSGIUCV) |
862 | help | |
863 | Select this option to enable the special message interface to | |
864 | the cooperative memory management. | |
865 | ||
1da177e4 | 866 | config APPLDATA_BASE |
6f9a3c33 MS |
867 | def_bool n |
868 | prompt "Linux - VM Monitor Stream, base infrastructure" | |
c185b783 | 869 | depends on PROC_FS |
1da177e4 LT |
870 | help |
871 | This provides a kernel interface for creating and updating z/VM APPLDATA | |
872 | monitor records. The monitor records are updated at certain time | |
873 | intervals, once the timer is started. | |
874 | Writing 1 or 0 to /proc/appldata/timer starts(1) or stops(0) the timer, | |
875 | i.e. enables or disables monitoring on the Linux side. | |
876 | A custom interval value (in seconds) can be written to | |
877 | /proc/appldata/interval. | |
878 | ||
879 | Defaults are 60 seconds interval and timer off. | |
880 | The /proc entries can also be read from, showing the current settings. | |
881 | ||
882 | config APPLDATA_MEM | |
6f9a3c33 MS |
883 | def_tristate m |
884 | prompt "Monitor memory management statistics" | |
62fb2ba3 | 885 | depends on APPLDATA_BASE && VM_EVENT_COUNTERS |
1da177e4 LT |
886 | help |
887 | This provides memory management related data to the Linux - VM Monitor | |
888 | Stream, like paging/swapping rate, memory utilisation, etc. | |
889 | Writing 1 or 0 to /proc/appldata/memory creates(1) or removes(0) a z/VM | |
890 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
891 | on the z/VM side. | |
892 | ||
893 | Default is disabled. | |
894 | The /proc entry can also be read from, showing the current settings. | |
895 | ||
896 | This can also be compiled as a module, which will be called | |
897 | appldata_mem.o. | |
898 | ||
899 | config APPLDATA_OS | |
6f9a3c33 MS |
900 | def_tristate m |
901 | prompt "Monitor OS statistics" | |
1da177e4 LT |
902 | depends on APPLDATA_BASE |
903 | help | |
904 | This provides OS related data to the Linux - VM Monitor Stream, like | |
905 | CPU utilisation, etc. | |
906 | Writing 1 or 0 to /proc/appldata/os creates(1) or removes(0) a z/VM | |
907 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
908 | on the z/VM side. | |
909 | ||
910 | Default is disabled. | |
911 | This can also be compiled as a module, which will be called | |
912 | appldata_os.o. | |
913 | ||
914 | config APPLDATA_NET_SUM | |
6f9a3c33 MS |
915 | def_tristate m |
916 | prompt "Monitor overall network statistics" | |
70193af9 | 917 | depends on APPLDATA_BASE && NET |
1da177e4 LT |
918 | help |
919 | This provides network related data to the Linux - VM Monitor Stream, | |
920 | currently there is only a total sum of network I/O statistics, no | |
921 | per-interface data. | |
922 | Writing 1 or 0 to /proc/appldata/net_sum creates(1) or removes(0) a z/VM | |
923 | APPLDATA monitor record, i.e. enables or disables monitoring this record | |
924 | on the z/VM side. | |
925 | ||
926 | Default is disabled. | |
927 | This can also be compiled as a module, which will be called | |
928 | appldata_net_sum.o. | |
929 | ||
24bbb1fa | 930 | config S390_HYPFS_FS |
6f9a3c33 MS |
931 | def_bool y |
932 | prompt "s390 hypervisor file system support" | |
24bbb1fa | 933 | select SYS_HYPERVISOR |
24bbb1fa MH |
934 | help |
935 | This is a virtual file system intended to provide accounting | |
936 | information in an s390 hypervisor environment. | |
937 | ||
843c48fd | 938 | source "arch/s390/kvm/Kconfig" |
411ed322 | 939 | |
fa587743 | 940 | config S390_GUEST |
6f9a3c33 | 941 | def_bool y |
510cf5a6 | 942 | prompt "s390 support for virtio devices" |
79b6f7fb | 943 | select TTY |
80629b0b | 944 | select VIRTUALIZATION |
fa587743 | 945 | select VIRTIO |
fa587743 | 946 | help |
bdd1fc27 CH |
947 | Enabling this option adds support for virtio based paravirtual device |
948 | drivers on s390. | |
1da177e4 | 949 | |
20766c08 | 950 | Select this option if you want to run the kernel as a guest under |
bdd1fc27 | 951 | the KVM hypervisor. |
155af2f9 HJP |
952 | |
953 | endmenu | |
badbf397 IL |
954 | |
955 | menu "Selftests" | |
956 | ||
957 | config S390_UNWIND_SELFTEST | |
958 | def_tristate n | |
959 | prompt "Test unwind functions" | |
960 | help | |
961 | This option enables s390 specific stack unwinder testing kernel | |
962 | module. This option is not useful for distributions or general | |
963 | kernels, but only for kernel developers working on architecture code. | |
964 | ||
965 | Say N if you are unsure. | |
966 | ||
967 | endmenu |