1 # SPDX-License-Identifier: GPL-2.0-only !! 1 # $Id: config.in,v 1.113 2002/01/24 22:14:44 davem Exp $
2 # <<
3 # For a description of the syntax of this conf 2 # For a description of the syntax of this configuration file,
4 # see Documentation/kbuild/kconfig-language.rs !! 3 # see Documentation/kbuild/kconfig-language.txt.
5 # 4 #
6 5
7 config 64BIT !! 6 mainmenu "Linux/SPARC Kernel Configuration"
8 bool <<
9 7
10 config 32BIT !! 8 config MMU
11 bool 9 bool
12 <<
13 config RISCV <<
14 def_bool y <<
15 select ACPI_GENERIC_GSI if ACPI <<
16 select ACPI_MCFG if (ACPI && PCI) <<
17 select ACPI_PPTT if ACPI <<
18 select ACPI_REDUCED_HARDWARE_ONLY if A <<
19 select ACPI_SPCR_TABLE if ACPI <<
20 select ARCH_DMA_DEFAULT_COHERENT <<
21 select ARCH_ENABLE_HUGEPAGE_MIGRATION <<
22 select ARCH_ENABLE_MEMORY_HOTPLUG if S <<
23 select ARCH_ENABLE_MEMORY_HOTREMOVE if <<
24 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if <<
25 select ARCH_ENABLE_THP_MIGRATION if TR <<
26 select ARCH_HAS_BINFMT_FLAT <<
27 select ARCH_HAS_CURRENT_STACK_POINTER <<
28 select ARCH_HAS_DEBUG_VIRTUAL if MMU <<
29 select ARCH_HAS_DEBUG_VM_PGTABLE <<
30 select ARCH_HAS_DEBUG_WX <<
31 select ARCH_HAS_FAST_MULTIPLIER <<
32 select ARCH_HAS_FORTIFY_SOURCE <<
33 select ARCH_HAS_GCOV_PROFILE_ALL <<
34 select ARCH_HAS_GIGANTIC_PAGE <<
35 select ARCH_HAS_KCOV <<
36 select ARCH_HAS_KERNEL_FPU_SUPPORT if <<
37 select ARCH_HAS_MEMBARRIER_CALLBACKS <<
38 select ARCH_HAS_MEMBARRIER_SYNC_CORE <<
39 select ARCH_HAS_MMIOWB <<
40 select ARCH_HAS_NON_OVERLAPPING_ADDRES <<
41 select ARCH_HAS_PMEM_API <<
42 select ARCH_HAS_PREPARE_SYNC_CORE_CMD <<
43 select ARCH_HAS_PTE_DEVMAP if 64BIT && <<
44 select ARCH_HAS_PTE_SPECIAL <<
45 select ARCH_HAS_SET_DIRECT_MAP if MMU <<
46 select ARCH_HAS_SET_MEMORY if MMU <<
47 select ARCH_HAS_STRICT_KERNEL_RWX if M <<
48 select ARCH_HAS_STRICT_MODULE_RWX if M <<
49 select ARCH_HAS_SYNC_CORE_BEFORE_USERM <<
50 select ARCH_HAS_SYSCALL_WRAPPER <<
51 select ARCH_HAS_TICK_BROADCAST if GENE <<
52 select ARCH_HAS_UBSAN <<
53 select ARCH_HAS_VDSO_DATA <<
54 select ARCH_KEEP_MEMBLOCK if ACPI <<
55 select ARCH_MHP_MEMMAP_ON_MEMORY_ENABL <<
56 select ARCH_OPTIONAL_KERNEL_RWX if ARC <<
57 select ARCH_OPTIONAL_KERNEL_RWX_DEFAUL <<
58 select ARCH_STACKWALK <<
59 select ARCH_SUPPORTS_ATOMIC_RMW <<
60 select ARCH_SUPPORTS_CFI_CLANG <<
61 select ARCH_SUPPORTS_DEBUG_PAGEALLOC i <<
62 select ARCH_SUPPORTS_HUGETLBFS if MMU <<
63 # LLD >= 14: https://github.com/llvm/l <<
64 select ARCH_SUPPORTS_LTO_CLANG if LLD_ <<
65 select ARCH_SUPPORTS_LTO_CLANG_THIN if <<
66 select ARCH_SUPPORTS_PAGE_TABLE_CHECK <<
67 select ARCH_SUPPORTS_PER_VMA_LOCK if M <<
68 select ARCH_SUPPORTS_RT <<
69 select ARCH_SUPPORTS_SHADOW_CALL_STACK <<
70 select ARCH_USE_CMPXCHG_LOCKREF if 64B <<
71 select ARCH_USE_MEMTEST <<
72 select ARCH_USE_QUEUED_RWLOCKS <<
73 select ARCH_USE_SYM_ANNOTATIONS <<
74 select ARCH_USES_CFI_TRAPS if CFI_CLAN <<
75 select ARCH_WANT_BATCHED_UNMAP_TLB_FLU <<
76 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_ <<
77 select ARCH_WANT_FRAME_POINTERS <<
78 select ARCH_WANT_GENERAL_HUGETLB if !R <<
79 select ARCH_WANT_HUGE_PMD_SHARE if 64B <<
80 select ARCH_WANT_LD_ORPHAN_WARN if !XI <<
81 select ARCH_WANT_OPTIMIZE_DAX_VMEMMAP <<
82 select ARCH_WANT_OPTIMIZE_HUGETLB_VMEM <<
83 select ARCH_WANTS_NO_INSTR <<
84 select ARCH_WANTS_THP_SWAP if HAVE_ARC <<
85 select BINFMT_FLAT_NO_DATA_START_OFFSE <<
86 select BUILDTIME_TABLE_SORT if MMU <<
87 select CLINT_TIMER if RISCV_M_MODE <<
88 select CLONE_BACKWARDS <<
89 select COMMON_CLK <<
90 select CPU_PM if CPU_IDLE || HIBERNATI <<
91 select EDAC_SUPPORT <<
92 select FRAME_POINTER if PERF_EVENTS || <<
93 select FTRACE_MCOUNT_USE_PATCHABLE_FUN <<
94 select GENERIC_ARCH_TOPOLOGY <<
95 select GENERIC_ATOMIC64 if !64BIT <<
96 select GENERIC_CLOCKEVENTS_BROADCAST i <<
97 select GENERIC_CPU_DEVICES <<
98 select GENERIC_CPU_VULNERABILITIES <<
99 select GENERIC_EARLY_IOREMAP <<
100 select GENERIC_ENTRY <<
101 select GENERIC_GETTIMEOFDAY if HAVE_GE <<
102 select GENERIC_IDLE_POLL_SETUP <<
103 select GENERIC_IOREMAP if MMU <<
104 select GENERIC_IRQ_IPI if SMP <<
105 select GENERIC_IRQ_IPI_MUX if SMP <<
106 select GENERIC_IRQ_MULTI_HANDLER <<
107 select GENERIC_IRQ_SHOW <<
108 select GENERIC_IRQ_SHOW_LEVEL <<
109 select GENERIC_LIB_DEVMEM_IS_ALLOWED <<
110 select GENERIC_PCI_IOMAP <<
111 select GENERIC_PTDUMP if MMU <<
112 select GENERIC_SCHED_CLOCK <<
113 select GENERIC_SMP_IDLE_THREAD <<
114 select GENERIC_TIME_VSYSCALL if MMU && <<
115 select GENERIC_VDSO_TIME_NS if HAVE_GE <<
116 select HARDIRQS_SW_RESEND <<
117 select HAS_IOPORT if MMU <<
118 select HAVE_ARCH_AUDITSYSCALL <<
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ <<
120 select HAVE_ARCH_HUGE_VMAP if MMU && 6 <<
121 select HAVE_ARCH_JUMP_LABEL if !XIP_KE <<
122 select HAVE_ARCH_JUMP_LABEL_RELATIVE i <<
123 select HAVE_ARCH_KASAN if MMU && 64BIT <<
124 select HAVE_ARCH_KASAN_VMALLOC if MMU <<
125 select HAVE_ARCH_KFENCE if MMU && 64BI <<
126 select HAVE_ARCH_KGDB if !XIP_KERNEL <<
127 select HAVE_ARCH_KGDB_QXFER_PKT <<
128 select HAVE_ARCH_MMAP_RND_BITS if MMU <<
129 select HAVE_ARCH_MMAP_RND_COMPAT_BITS <<
130 select HAVE_ARCH_RANDOMIZE_KSTACK_OFFS <<
131 select HAVE_ARCH_SECCOMP_FILTER <<
132 select HAVE_ARCH_STACKLEAK <<
133 select HAVE_ARCH_THREAD_STRUCT_WHITELI <<
134 select HAVE_ARCH_TRACEHOOK <<
135 select HAVE_ARCH_TRANSPARENT_HUGEPAGE <<
136 select HAVE_ARCH_USERFAULTFD_MINOR if <<
137 select HAVE_ARCH_VMAP_STACK if MMU && <<
138 select HAVE_ASM_MODVERSIONS <<
139 select HAVE_CONTEXT_TRACKING_USER <<
140 select HAVE_DEBUG_KMEMLEAK <<
141 select HAVE_DMA_CONTIGUOUS if MMU <<
142 select HAVE_DYNAMIC_FTRACE if !XIP_KER <<
143 select HAVE_DYNAMIC_FTRACE_WITH_DIRECT <<
144 select HAVE_DYNAMIC_FTRACE_WITH_ARGS i <<
145 select HAVE_FTRACE_MCOUNT_RECORD if !X <<
146 select HAVE_FUNCTION_GRAPH_TRACER <<
147 select HAVE_FUNCTION_GRAPH_RETVAL if H <<
148 select HAVE_FUNCTION_TRACER if !XIP_KE <<
149 select HAVE_EBPF_JIT if MMU <<
150 select HAVE_GUP_FAST if MMU <<
151 select HAVE_FUNCTION_ARG_ACCESS_API <<
152 select HAVE_FUNCTION_ERROR_INJECTION <<
153 select HAVE_GCC_PLUGINS <<
154 select HAVE_GENERIC_VDSO if MMU && 64B <<
155 select HAVE_IRQ_TIME_ACCOUNTING <<
156 select HAVE_KERNEL_BZIP2 if !XIP_KERNE <<
157 select HAVE_KERNEL_GZIP if !XIP_KERNEL <<
158 select HAVE_KERNEL_LZ4 if !XIP_KERNEL <<
159 select HAVE_KERNEL_LZMA if !XIP_KERNEL <<
160 select HAVE_KERNEL_LZO if !XIP_KERNEL <<
161 select HAVE_KERNEL_UNCOMPRESSED if !XI <<
162 select HAVE_KERNEL_ZSTD if !XIP_KERNEL <<
163 select HAVE_KERNEL_XZ if !XIP_KERNEL & <<
164 select HAVE_KPROBES if !XIP_KERNEL <<
165 select HAVE_KRETPROBES if !XIP_KERNEL <<
166 # https://github.com/ClangBuiltLinux/l <<
167 select HAVE_LD_DEAD_CODE_DATA_ELIMINAT <<
168 select HAVE_MOVE_PMD <<
169 select HAVE_MOVE_PUD <<
170 select HAVE_PAGE_SIZE_4KB <<
171 select HAVE_PCI <<
172 select HAVE_PERF_EVENTS <<
173 select HAVE_PERF_REGS <<
174 select HAVE_PERF_USER_STACK_DUMP <<
175 select HAVE_POSIX_CPU_TIMERS_TASK_WORK <<
176 select HAVE_PREEMPT_DYNAMIC_KEY if !XI <<
177 select HAVE_REGS_AND_STACK_ACCESS_API <<
178 select HAVE_RETHOOK if !XIP_KERNEL <<
179 select HAVE_RSEQ <<
180 select HAVE_RUST if RUSTC_SUPPORTS_RIS <<
181 select HAVE_SAMPLE_FTRACE_DIRECT <<
182 select HAVE_SAMPLE_FTRACE_DIRECT_MULTI <<
183 select HAVE_STACKPROTECTOR <<
184 select HAVE_SYSCALL_TRACEPOINTS <<
185 select HOTPLUG_CORE_SYNC_DEAD if HOTPL <<
186 select IRQ_DOMAIN <<
187 select IRQ_FORCED_THREADING <<
188 select KASAN_VMALLOC if KASAN <<
189 select LOCK_MM_AND_FIND_VMA <<
190 select MMU_GATHER_RCU_TABLE_FREE if SM <<
191 select MODULES_USE_ELF_RELA if MODULES <<
192 select OF <<
193 select OF_EARLY_FLATTREE <<
194 select OF_IRQ <<
195 select PCI_DOMAINS_GENERIC if PCI <<
196 select PCI_ECAM if (ACPI && PCI) <<
197 select PCI_MSI if PCI <<
198 select RISCV_ALTERNATIVE if !XIP_KERNE <<
199 select RISCV_APLIC <<
200 select RISCV_IMSIC <<
201 select RISCV_INTC <<
202 select RISCV_TIMER if RISCV_SBI <<
203 select SIFIVE_PLIC <<
204 select SPARSE_IRQ <<
205 select SYSCTL_EXCEPTION_TRACE <<
206 select THREAD_INFO_IN_TASK <<
207 select TRACE_IRQFLAGS_SUPPORT <<
208 select UACCESS_MEMCPY if !MMU <<
209 select USER_STACKTRACE_SUPPORT <<
210 select ZONE_DMA32 if 64BIT <<
211 <<
212 config RUSTC_SUPPORTS_RISCV <<
213 def_bool y <<
214 depends on 64BIT <<
215 # Shadow call stack requires rustc ver <<
216 # -Zsanitizer=shadow-call-stack flag. <<
217 depends on !SHADOW_CALL_STACK || RUSTC <<
218 <<
219 config CLANG_SUPPORTS_DYNAMIC_FTRACE <<
220 def_bool CC_IS_CLANG <<
221 # https://github.com/ClangBuiltLinux/l <<
222 depends on AS_IS_GNU || (AS_IS_LLVM && <<
223 <<
224 config GCC_SUPPORTS_DYNAMIC_FTRACE <<
225 def_bool CC_IS_GCC <<
226 depends on $(cc-option,-fpatchable-fun <<
227 <<
228 config HAVE_SHADOW_CALL_STACK <<
229 def_bool $(cc-option,-fsanitize=shadow <<
230 # https://github.com/riscv-non-isa/ris <<
231 depends on $(ld-option,--no-relax-gp) <<
232 <<
233 config RISCV_USE_LINKER_RELAXATION <<
234 def_bool y <<
235 # https://github.com/llvm/llvm-project <<
236 depends on !LD_IS_LLD || LLD_VERSION > <<
237 <<
238 # https://github.com/llvm/llvm-project/commit/ <<
239 config ARCH_HAS_BROKEN_DWARF5 <<
240 def_bool y <<
241 depends on RISCV_USE_LINKER_RELAXATION <<
242 # https://github.com/llvm/llvm-project <<
243 depends on AS_IS_LLVM && AS_VERSION < <<
244 # https://github.com/llvm/llvm-project <<
245 depends on LD_IS_LLD && LLD_VERSION < <<
246 <<
247 config ARCH_MMAP_RND_BITS_MIN <<
248 default 18 if 64BIT <<
249 default 8 <<
250 <<
251 config ARCH_MMAP_RND_COMPAT_BITS_MIN <<
252 default 8 <<
253 <<
254 # max bits determined by the following formula <<
255 # VA_BITS - PAGE_SHIFT - 3 <<
256 config ARCH_MMAP_RND_BITS_MAX <<
257 default 24 if 64BIT # SV39 based <<
258 default 17 <<
259 <<
260 config ARCH_MMAP_RND_COMPAT_BITS_MAX <<
261 default 17 <<
262 <<
263 # set if we run in machine mode, cleared if we <<
264 config RISCV_M_MODE <<
265 bool "Build a kernel that runs in mach <<
266 depends on !MMU <<
267 default y 10 default y
268 help <<
269 Select this option if you want to ru <<
270 without the assistance of any other <<
271 11
272 # set if we are running in S-mode and can use !! 12 config UID16
273 config RISCV_SBI <<
274 bool 13 bool
275 depends on !RISCV_M_MODE <<
276 default y 14 default y
277 15
278 config MMU !! 16 config HIGHMEM
279 bool "MMU-based Paged Memory Managemen !! 17 bool
280 default y 18 default y
281 help <<
282 Select if you want MMU-based virtual <<
283 support by paged memory management. <<
284 <<
285 config PAGE_OFFSET <<
286 hex <<
287 default 0x80000000 if !MMU && RISCV_M_ <<
288 default 0x80200000 if !MMU <<
289 default 0xc0000000 if 32BIT <<
290 default 0xff60000000000000 if 64BIT <<
291 <<
292 config KASAN_SHADOW_OFFSET <<
293 hex <<
294 depends on KASAN_GENERIC <<
295 default 0xdfffffff00000000 if 64BIT <<
296 default 0xffffffff if 32BIT <<
297 <<
298 config ARCH_FLATMEM_ENABLE <<
299 def_bool !NUMA <<
300 <<
301 config ARCH_SPARSEMEM_ENABLE <<
302 def_bool y <<
303 depends on MMU <<
304 select SPARSEMEM_STATIC if 32BIT && SP <<
305 select SPARSEMEM_VMEMMAP_ENABLE if 64B <<
306 <<
307 config ARCH_SELECT_MEMORY_MODEL <<
308 def_bool ARCH_SPARSEMEM_ENABLE <<
309 <<
310 config ARCH_SUPPORTS_UPROBES <<
311 def_bool y <<
312 <<
313 config STACKTRACE_SUPPORT <<
314 def_bool y <<
315 <<
316 config GENERIC_BUG <<
317 def_bool y <<
318 depends on BUG <<
319 select GENERIC_BUG_RELATIVE_POINTERS i <<
320 19
321 config GENERIC_BUG_RELATIVE_POINTERS !! 20 config GENERIC_ISA_DMA
322 bool 21 bool
>> 22 default y
323 23
324 config GENERIC_CALIBRATE_DELAY !! 24 source "init/Kconfig"
325 def_bool y <<
326 <<
327 config GENERIC_CSUM <<
328 def_bool y <<
329 <<
330 config GENERIC_HWEIGHT <<
331 def_bool y <<
332 <<
333 config FIX_EARLYCON_MEM <<
334 def_bool MMU <<
335 <<
336 config ILLEGAL_POINTER_VALUE <<
337 hex <<
338 default 0 if 32BIT <<
339 default 0xdead000000000000 if 64BIT <<
340 <<
341 config PGTABLE_LEVELS <<
342 int <<
343 default 5 if 64BIT <<
344 default 2 <<
345 25
346 config LOCKDEP_SUPPORT <<
347 def_bool y <<
348 26
349 config RISCV_DMA_NONCOHERENT !! 27 menu "General setup"
350 bool <<
351 select ARCH_HAS_DMA_PREP_COHERENT <<
352 select ARCH_HAS_SETUP_DMA_OPS <<
353 select ARCH_HAS_SYNC_DMA_FOR_CPU <<
354 select ARCH_HAS_SYNC_DMA_FOR_DEVICE <<
355 select DMA_BOUNCE_UNALIGNED_KMALLOC if <<
356 28
357 config RISCV_NONSTANDARD_CACHE_OPS !! 29 config VT
358 bool 30 bool
359 help !! 31 default y
360 This enables function pointer suppor !! 32 ---help---
361 systems to handle cache management. !! 33 If you say Y here, you will get support for terminal devices with
362 !! 34 display and keyboard devices. These are called "virtual" because you
363 config AS_HAS_INSN !! 35 can run several virtual terminals (also called virtual consoles) on
364 def_bool $(as-instr,.insn r 51$(comma) !! 36 one physical terminal. This is rather useful, for example one
365 !! 37 virtual terminal can collect system messages and warnings, another
366 config AS_HAS_OPTION_ARCH !! 38 one can be used for a text-mode user session, and a third could run
367 # https://github.com/llvm/llvm-project !! 39 an X session, all in parallel. Switching between virtual terminals
368 def_bool y !! 40 is done with certain key combinations, usually Alt-<function key>.
369 depends on $(as-instr, .option arch$(c <<
370 41
371 source "arch/riscv/Kconfig.socs" !! 42 The setterm command ("man setterm") can be used to change the
372 source "arch/riscv/Kconfig.errata" !! 43 properties (such as colors or beeping) of a virtual terminal. The
>> 44 man page console_codes(4) ("man console_codes") contains the special
>> 45 character sequences that can be used to change those properties
>> 46 directly. The fonts used on virtual terminals can be changed with
>> 47 the setfont ("man setfont") command and the key bindings are defined
>> 48 with the loadkeys ("man loadkeys") command.
373 49
374 menu "Platform type" !! 50 You need at least one virtual terminal device in order to make use
>> 51 of your keyboard and monitor. Therefore, only people configuring an
>> 52 embedded system would want to say N here in order to save some
>> 53 memory; the only way to log into such a system is then via a serial
>> 54 or network connection.
375 55
376 config NONPORTABLE !! 56 If unsure, say Y, or else you won't be able to do much with your new
377 bool "Allow configurations that result !! 57 shiny Linux system :-)
378 help <<
379 RISC-V kernel binaries are compatibl <<
380 whenever possible, but there are som <<
381 satisfied by configurations that res <<
382 not portable between systems. <<
383 <<
384 Selecting N does not guarantee kerne <<
385 systems. Selecting any of the optio <<
386 result in kernel binaries that are u <<
387 systems. <<
388 58
389 If unsure, say N. !! 59 config VT_CONSOLE
>> 60 bool
>> 61 default y
>> 62 ---help---
>> 63 The system console is the device which receives all kernel messages
>> 64 and warnings and which allows logins in single user mode. If you
>> 65 answer Y here, a virtual terminal (the device used to interact with
>> 66 a physical terminal) can be used as system console. This is the most
>> 67 common mode of operations, so you should say Y here unless you want
>> 68 the kernel messages be output only to a serial port (in which case
>> 69 you should say Y to "Console on serial port", below).
390 70
391 choice !! 71 If you do say Y here, by default the currently visible virtual
392 prompt "Base ISA" !! 72 terminal (/dev/tty0) will be used as system console. You can change
393 default ARCH_RV64I !! 73 that with a kernel command line option such as "console=tty3" which
394 help !! 74 would use the third virtual terminal as system console. (Try "man
395 This selects the base ISA that this !! 75 bootparam" or see the documentation of your boot loader (lilo or
396 the target platform. !! 76 loadlin) about how to pass options to the kernel at boot time.)
397 77
398 config ARCH_RV32I !! 78 If unsure, say Y.
399 bool "RV32I" <<
400 depends on NONPORTABLE <<
401 select 32BIT <<
402 select GENERIC_LIB_ASHLDI3 <<
403 select GENERIC_LIB_ASHRDI3 <<
404 select GENERIC_LIB_LSHRDI3 <<
405 select GENERIC_LIB_UCMPDI2 <<
406 <<
407 config ARCH_RV64I <<
408 bool "RV64I" <<
409 select 64BIT <<
410 select ARCH_SUPPORTS_INT128 if CC_HAS_ <<
411 select SWIOTLB if MMU <<
412 <<
413 endchoice <<
414 <<
415 # We must be able to map all physical memory i <<
416 # is still a bit more efficient when generatin <<
417 # such that it can only map 2GiB of memory. <<
418 choice <<
419 prompt "Kernel Code Model" <<
420 default CMODEL_MEDLOW if 32BIT <<
421 default CMODEL_MEDANY if 64BIT <<
422 <<
423 config CMODEL_MEDLOW <<
424 bool "medium low code model" <<
425 config CMODEL_MEDANY <<
426 bool "medium any code model" <<
427 endchoice <<
428 79
429 config MODULE_SECTIONS !! 80 config HW_CONSOLE
430 bool 81 bool
431 select HAVE_MOD_ARCH_SPECIFIC !! 82 default y
432 83
433 config SMP 84 config SMP
434 bool "Symmetric Multi-Processing" !! 85 bool "Symmetric multi-processing support (does not work on sun4/sun4c)"
435 help !! 86 ---help---
436 This enables support for systems wit !! 87 This enables support for systems with more than one CPU. If you have
437 you say N here, the kernel will run !! 88 a system with only one CPU, like most personal computers, say N. If
438 multiprocessor machines, but will us !! 89 you have a system with more than one CPU, say Y.
439 multiprocessor machine. If you say Y !! 90
440 on many, but not all, single process !! 91 If you say N here, the kernel will run on single and multiprocessor
441 processor machine, the kernel will r !! 92 machines, but will use only one CPU of a multiprocessor machine. If
442 here. !! 93 you say Y here, the kernel will run on many, but not all,
>> 94 singleprocessor machines. On a singleprocessor machine, the kernel
>> 95 will run faster if you say N here.
>> 96
>> 97 Note that if you say Y here and choose architecture "586" or
>> 98 "Pentium" under "Processor family", the kernel will not work on 486
>> 99 architectures. Similarly, multiprocessor kernels for the "PPro"
>> 100 architecture may not work on all Pentium based boards.
>> 101
>> 102 People using multiprocessor machines who say Y here should also say
>> 103 Y to "Enhanced Real Time Clock Support", below. The "Advanced Power
>> 104 Management" code will be disabled if you say Y here.
>> 105
>> 106 See also the <file:Documentation/smp.tex>,
>> 107 <file:Documentation/smp.txt>, <file:Documentation/i386/IO-APIC.txt>,
>> 108 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
>> 109 <http://www.tldp.org/docs.html#howto>.
443 110
444 If you don't know what to do here, s 111 If you don't know what to do here, say N.
445 112
446 config SCHED_MC <<
447 bool "Multi-core scheduler support" <<
448 depends on SMP <<
449 help <<
450 Multi-core scheduler support improve <<
451 making when dealing with multi-core <<
452 increased overhead in some places. I <<
453 <<
454 config NR_CPUS 113 config NR_CPUS
455 int "Maximum number of CPUs (2-512)" !! 114 int "Maximum number of CPUs (2-32)"
456 depends on SMP <<
457 range 2 512 if !RISCV_SBI_V01 <<
458 range 2 32 if RISCV_SBI_V01 && 32BIT <<
459 range 2 64 if RISCV_SBI_V01 && 64BIT <<
460 default "32" if 32BIT <<
461 default "64" if 64BIT <<
462 <<
463 config HOTPLUG_CPU <<
464 bool "Support for hot-pluggable CPUs" <<
465 depends on SMP 115 depends on SMP
466 select GENERIC_IRQ_MIGRATION !! 116 default "32"
467 help <<
468 <<
469 Say Y here to experiment with turnin <<
470 can be controlled through /sys/devic <<
471 <<
472 Say N if you want to disable CPU hot <<
473 117
474 choice !! 118 # Identify this as a Sparc32 build
475 prompt "CPU Tuning" !! 119 config SPARC32
476 default TUNE_GENERIC !! 120 bool
477 !! 121 default y
478 config TUNE_GENERIC <<
479 bool "generic" <<
480 <<
481 endchoice <<
482 <<
483 # Common NUMA Features <<
484 config NUMA <<
485 bool "NUMA Memory Allocation and Sched <<
486 depends on SMP && MMU <<
487 select ARCH_SUPPORTS_NUMA_BALANCING <<
488 select GENERIC_ARCH_NUMA <<
489 select HAVE_SETUP_PER_CPU_AREA <<
490 select NEED_PER_CPU_EMBED_FIRST_CHUNK <<
491 select NEED_PER_CPU_PAGE_FIRST_CHUNK <<
492 select OF_NUMA <<
493 select USE_PERCPU_NUMA_NODE_ID <<
494 help 122 help
495 Enable NUMA (Non-Uniform Memory Acce !! 123 SPARC is a family of RISC microprocessors designed and marketed by
496 !! 124 Sun Microsystems, incorporated. They are very widely found in Sun
497 The kernel will try to allocate memo !! 125 workstations and clones. This port covers the original 32-bit SPARC;
498 local memory of the CPU and add some !! 126 it is old and stable and usually considered one of the "big three"
>> 127 along with the Intel and Alpha ports. The UltraLinux project
>> 128 maintains both the SPARC32 and SPARC64 ports; its web page is
>> 129 available at <http://www.ultralinux.org/>.
499 130
500 config NODES_SHIFT !! 131 # Global things across all Sun machines.
501 int "Maximum NUMA Nodes (as a power of !! 132 config ISA
502 range 1 10 !! 133 bool
503 default "2" <<
504 depends on NUMA <<
505 help 134 help
506 Specify the maximum number of NUMA N !! 135 ISA is found on Espresso only and is not supported currently.
507 system. Increases memory reserved t !! 136 Say N
508 137
509 config RISCV_ALTERNATIVE !! 138 config EISA
510 bool 139 bool
511 depends on !XIP_KERNEL <<
512 help 140 help
513 This Kconfig allows the kernel to au !! 141 EISA is not supported.
514 erratum or cpufeature required by th !! 142 Say N
515 time. The code patching overhead is <<
516 once at boot and once on each module <<
517 143
518 config RISCV_ALTERNATIVE_EARLY !! 144 config MCA
519 bool 145 bool
520 depends on RISCV_ALTERNATIVE <<
521 help 146 help
522 Allows early patching of the kernel !! 147 MCA is not supported.
>> 148 Say N
>> 149
>> 150 config PCMCIA
>> 151 tristate
>> 152 ---help---
>> 153 Say Y here if you want to attach PCMCIA- or PC-cards to your Linux
>> 154 computer. These are credit-card size devices such as network cards,
>> 155 modems or hard drives often used with laptops computers. There are
>> 156 actually two varieties of these cards: the older 16 bit PCMCIA cards
>> 157 and the newer 32 bit CardBus cards. If you want to use CardBus
>> 158 cards, you need to say Y here and also to "CardBus support" below.
523 159
524 config RISCV_ISA_C !! 160 To use your PC-cards, you will need supporting software from David
525 bool "Emit compressed instructions whe !! 161 Hinds' pcmcia-cs package (see the file <file:Documentation/Changes>
>> 162 for location). Please also read the PCMCIA-HOWTO, available from
>> 163 <http://www.tldp.org/docs.html#howto>.
>> 164
>> 165 To compile this driver as modules, choose M here: the
>> 166 modules will be called pcmcia_core and ds.
>> 167
>> 168 config SBUS
>> 169 bool
526 default y 170 default y
527 help !! 171
528 Adds "C" to the ISA subsets that the !! 172 config SBUSCHAR
529 when building Linux, which results i !! 173 bool
530 Linux binary. <<
531 <<
532 If you don't know what to do here, s <<
533 <<
534 config RISCV_ISA_SVNAPOT <<
535 bool "Svnapot extension support for su <<
536 depends on 64BIT && MMU <<
537 depends on RISCV_ALTERNATIVE <<
538 default y 174 default y
539 help <<
540 Allow kernel to detect the Svnapot I <<
541 time and enable its usage. <<
542 175
543 The Svnapot extension is used to mar !! 176 config SERIAL_CONSOLE
544 of contiguous virtual-to-physical tr !! 177 bool
545 aligned power-of-2 (NAPOT) granulari <<
546 size. When HUGETLBFS is also selecte <<
547 allocates some memory for each NAPOT <<
548 When optimizing for low memory consu <<
549 the Svnapot extension, it may be bet <<
550 <<
551 If you don't know what to do here, s <<
552 <<
553 config RISCV_ISA_SVPBMT <<
554 bool "Svpbmt extension support for sup <<
555 depends on 64BIT && MMU <<
556 depends on RISCV_ALTERNATIVE <<
557 default y 178 default y
558 help !! 179 ---help---
559 Adds support to dynamically detect !! 180 If you say Y here, it will be possible to use a serial port as the
560 ISA-extension (Supervisor-mode: pag !! 181 system console (the system console is the device which receives all
561 enable its usage. !! 182 kernel messages and warnings and which allows logins in single user
>> 183 mode). This could be useful if some terminal or printer is connected
>> 184 to that serial port.
562 185
563 The memory type for a page contains !! 186 Even if you say Y here, the currently visible virtual console
564 that indicate the cacheability, ide !! 187 (/dev/tty0) will still be used as the system console by default, but
565 properties for access to that page. !! 188 you can alter that using a kernel command line option such as
>> 189 "console=ttyS1". (Try "man bootparam" or see the documentation of
>> 190 your boot loader (lilo or loadlin) about how to pass options to the
>> 191 kernel at boot time.)
566 192
567 The Svpbmt extension is only availa !! 193 If you don't have a VGA card installed and you say Y here, the
>> 194 kernel will automatically use the first serial line, /dev/ttyS0, as
>> 195 system console.
568 196
569 If you don't know what to do here, !! 197 If unsure, say N.
570 198
571 config TOOLCHAIN_HAS_V !! 199 config SUN_AUXIO
572 bool 200 bool
573 default y 201 default y
574 depends on !64BIT || $(cc-option,-mabi <<
575 depends on !32BIT || $(cc-option,-mabi <<
576 depends on LLD_VERSION >= 140000 || LD <<
577 depends on AS_HAS_OPTION_ARCH <<
578 <<
579 config RISCV_ISA_V <<
580 bool "VECTOR extension support" <<
581 depends on TOOLCHAIN_HAS_V <<
582 depends on FPU <<
583 select DYNAMIC_SIGFRAME <<
584 default y <<
585 help <<
586 Say N here if you want to disable al <<
587 in the kernel. <<
588 202
589 If you don't know what to do here, s !! 203 config SUN_IO
590 !! 204 bool
591 config RISCV_ISA_V_DEFAULT_ENABLE <<
592 bool "Enable userspace Vector by defau <<
593 depends on RISCV_ISA_V <<
594 default y 205 default y
595 help <<
596 Say Y here if you want to enable Vec <<
597 Otherwise, userspace has to make exp <<
598 Vector, or enable it via the sysctl <<
599 <<
600 If you don't know what to do here, s <<
601 <<
602 config RISCV_ISA_V_UCOPY_THRESHOLD <<
603 int "Threshold size for vectorized use <<
604 depends on RISCV_ISA_V <<
605 default 768 <<
606 help <<
607 Prefer using vectorized copy_to_user <<
608 workload size exceeds this value. <<
609 206
610 config RISCV_ISA_V_PREEMPTIVE !! 207 config RWSEM_GENERIC_SPINLOCK
611 bool "Run kernel-mode Vector with kern !! 208 bool
612 depends on PREEMPTION <<
613 depends on RISCV_ISA_V <<
614 default y <<
615 help <<
616 Usually, in-kernel SIMD routines are <<
617 Functions which envoke long running <<
618 vector unit to prevent blocking othe <<
619 <<
620 This config allows kernel to run SIM <<
621 preemption. Enabling this config wil <<
622 consumption due to the allocation of <<
623 <<
624 config RISCV_ISA_ZAWRS <<
625 bool "Zawrs extension support for more <<
626 depends on RISCV_ALTERNATIVE <<
627 default y 209 default y
628 help <<
629 The Zawrs extension defines instruct <<
630 which allow a hart to enter a low-po <<
631 hypervisor while waiting on a store <<
632 use of these instructions in the ker <<
633 detected at boot. <<
634 <<
635 If you don't know what to do here, s <<
636 210
637 config TOOLCHAIN_HAS_ZBB !! 211 config RWSEM_XCHGADD_ALGORITHM
638 bool 212 bool
639 default y <<
640 depends on !64BIT || $(cc-option,-mabi <<
641 depends on !32BIT || $(cc-option,-mabi <<
642 depends on LLD_VERSION >= 150000 || LD <<
643 depends on AS_HAS_OPTION_ARCH <<
644 <<
645 # This symbol indicates that the toolchain sup <<
646 # extensions, including Zvk*, Zvbb, and Zvbc. <<
647 # binutils added all except Zvkb, then added Z <<
648 config TOOLCHAIN_HAS_VECTOR_CRYPTO <<
649 def_bool $(as-instr, .option arch$(com <<
650 depends on AS_HAS_OPTION_ARCH <<
651 213
652 config RISCV_ISA_ZBA !! 214 config SUN_PM
653 bool "Zba extension support for bit ma !! 215 bool
654 default y 216 default y
655 help 217 help
656 Add support for enabling optimisati !! 218 Enable power management and CPU standby features on supported
657 extension is detected at boot. !! 219 SPARC platforms.
658 220
659 The Zba extension provides instruct !! 221 config SUN4
660 of addresses that index into arrays !! 222 bool "Support for SUN4 machines (disables SUN4[CDM] support)"
>> 223 help
>> 224 Say Y here if, and only if, your machine is a sun4. Note that
>> 225 a kernel compiled with this option will run only on sun4.
>> 226 (And the current version will probably work only on sun4/330.)
661 227
662 If you don't know what to do here, !! 228 if !SUN4
663 229
664 config RISCV_ISA_ZBB !! 230 config PCI
665 bool "Zbb extension support for bit ma !! 231 bool "Support for PCI and PS/2 keyboard/mouse"
666 depends on TOOLCHAIN_HAS_ZBB <<
667 depends on RISCV_ALTERNATIVE <<
668 default y <<
669 help 232 help
670 Adds support to dynamically detect !! 233 CONFIG_PCI is needed for all JavaStation's (including MrCoffee),
671 extension (basic bit manipulation) !! 234 CP-1200, JavaEngine-1, Corona, Red October, and Serengeti SGSC.
>> 235 All of these platforms are extremely obscure, so say N if unsure.
672 236
673 The Zbb extension provides instruct !! 237 source "drivers/pci/Kconfig"
674 of bit-specific operations (count b <<
675 bitrotation, etc). <<
676 238
677 If you don't know what to do here, !! 239 endif
678 240
679 config TOOLCHAIN_HAS_ZBC !! 241 config SUN_OPENPROMFS
680 bool !! 242 tristate "Openprom tree appears in /proc/openprom"
681 default y <<
682 depends on !64BIT || $(cc-option,-mabi <<
683 depends on !32BIT || $(cc-option,-mabi <<
684 depends on LLD_VERSION >= 150000 || LD <<
685 depends on AS_HAS_OPTION_ARCH <<
686 <<
687 config RISCV_ISA_ZBC <<
688 bool "Zbc extension support for carry- <<
689 depends on TOOLCHAIN_HAS_ZBC <<
690 depends on MMU <<
691 depends on RISCV_ALTERNATIVE <<
692 default y <<
693 help 243 help
694 Adds support to dynamically detect !! 244 If you say Y, the OpenPROM device tree will be available as a
695 extension (carry-less multiplicatio !! 245 virtual file system, which you can mount to /proc/openprom by "mount
>> 246 -t openpromfs none /proc/openprom".
696 247
697 The Zbc extension could accelerate !! 248 To compile the /proc/openprom support as a module, choose M here: the
698 calculations. !! 249 module will be called openpromfs. If unsure, choose M.
699 250
700 If you don't know what to do here, !! 251 source "fs/Kconfig.binfmt"
701 252
702 config RISCV_ISA_ZICBOM !! 253 config SUNOS_EMUL
703 bool "Zicbom extension support for non !! 254 bool "SunOS binary emulation"
704 depends on MMU <<
705 depends on RISCV_ALTERNATIVE <<
706 default y <<
707 select RISCV_DMA_NONCOHERENT <<
708 select DMA_DIRECT_REMAP <<
709 help 255 help
710 Adds support to dynamically detect !! 256 This allows you to run most SunOS binaries. If you want to do this,
711 extension (Cache Block Management O !! 257 say Y here and place appropriate files in /usr/gnemul/sunos. See
712 usage. !! 258 <http://www.ultralinux.org/faq.html> for more information. If you
713 !! 259 want to run SunOS binaries on an Ultra you must also say Y to
714 The Zicbom extension can be used to !! 260 "Kernel support for 32-bit a.out binaries" above.
715 non-coherent DMA support on devices <<
716 <<
717 If you don't know what to do here, <<
718 <<
719 config RISCV_ISA_ZICBOZ <<
720 bool "Zicboz extension support for fas <<
721 depends on RISCV_ALTERNATIVE <<
722 default y <<
723 help <<
724 Enable the use of the Zicboz extens <<
725 when available. <<
726 261
727 The Zicboz extension is used for fa !! 262 source "drivers/parport/Kconfig"
728 263
729 If you don't know what to do here, !! 264 config PRINTER
>> 265 tristate "Parallel printer support"
>> 266 depends on PARPORT
>> 267 ---help---
>> 268 If you intend to attach a printer to the parallel port of your Linux
>> 269 box (as opposed to using a serial printer; if the connector at the
>> 270 printer has 9 or 25 holes ["female"], then it's serial), say Y.
>> 271 Also read the Printing-HOWTO, available from
>> 272 <http://www.tldp.org/docs.html#howto>.
730 273
731 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI !! 274 It is possible to share one parallel port among several devices
732 def_bool y !! 275 (e.g. printer and ZIP drive) and it is safe to compile the
733 # https://sourceware.org/git/?p=binuti !! 276 corresponding drivers into the kernel. If you want to compile this
734 # https://gcc.gnu.org/git/?p=gcc.git;a !! 277 driver as a module however, choose M here and read
735 depends on AS_IS_GNU && AS_VERSION >= !! 278 <file:Documentation/parport.txt>. The module will be called lp.
736 help <<
737 Binutils-2.38 and GCC-12.1.0 bumped <<
738 20191213 version, which moves some i <<
739 the Zicsr and Zifencei extensions. T <<
740 Zicsr and Zifencei when binutils >= <<
741 and Zifencei are supported in binuti <<
742 To make life easier, and avoid forci <<
743 newer ISA spec to version 2.2, relax <<
744 For clang < 17 or GCC < 11.3.0, for <<
745 special treatment, this is dealt wit <<
746 <<
747 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC <<
748 def_bool y <<
749 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZI <<
750 # https://github.com/llvm/llvm-project <<
751 # https://gcc.gnu.org/git/?p=gcc.git;a <<
752 depends on (CC_IS_CLANG && CLANG_VERSI <<
753 help <<
754 Certain versions of clang and GCC do <<
755 -march. This option causes an older <<
756 versions of clang and GCC to be pass <<
757 as passing zicsr and zifencei to -ma <<
758 279
759 config FPU !! 280 If you have several parallel ports, you can specify which ports to
760 bool "FPU support" !! 281 use with the "lp" kernel command line option. (Try "man bootparam"
761 default y !! 282 or see the documentation of your boot loader (lilo or loadlin) about
762 help !! 283 how to pass options to the kernel at boot time.) The syntax of the
763 Say N here if you want to disable al !! 284 "lp" command line option can be found in <file:drivers/char/lp.c>.
764 in the kernel. <<
765 285
766 If you don't know what to do here, s !! 286 If you have more than 8 printers, you need to increase the LP_NO
>> 287 macro in lp.c and the PARPORT_MAX macro in parport.h.
767 288
768 config IRQ_STACKS !! 289 endmenu
769 bool "Independent irq & softirq stacks <<
770 default y <<
771 select HAVE_IRQ_EXIT_ON_IRQ_STACK <<
772 select HAVE_SOFTIRQ_ON_OWN_STACK <<
773 help <<
774 Add independent irq & softirq stacks <<
775 overflows. We may save some memory f <<
776 290
777 config THREAD_SIZE_ORDER !! 291 source "drivers/base/Kconfig"
778 int "Kernel stack size (in power-of-tw <<
779 range 0 4 <<
780 default 1 if 32BIT <<
781 default 2 <<
782 help <<
783 Specify the Pages of thread stack si <<
784 affects irq stack size, which is equ <<
785 292
786 config RISCV_MISALIGNED !! 293 source "drivers/video/Kconfig"
787 bool <<
788 select SYSCTL_ARCH_UNALIGN_ALLOW <<
789 help <<
790 Embed support for emulating misalign <<
791 294
792 choice !! 295 source "drivers/mtd/Kconfig"
793 prompt "Unaligned Accesses Support" <<
794 default RISCV_PROBE_UNALIGNED_ACCESS <<
795 help <<
796 This determines the level of support <<
797 information is used by the kernel to <<
798 exposed to user space via the hwprob <<
799 probed at boot by default. <<
800 <<
801 config RISCV_PROBE_UNALIGNED_ACCESS <<
802 bool "Probe for hardware unaligned acc <<
803 select RISCV_MISALIGNED <<
804 help <<
805 During boot, the kernel will run a s <<
806 speed of unaligned accesses. This pr <<
807 the speed of unaligned accesses on t <<
808 memory accesses trap into the kernel <<
809 system, the kernel will emulate the <<
810 UABI. <<
811 <<
812 config RISCV_EMULATED_UNALIGNED_ACCESS <<
813 bool "Emulate unaligned access where s <<
814 select RISCV_MISALIGNED <<
815 help <<
816 If unaligned memory accesses trap in <<
817 supported by the system, the kernel <<
818 accesses to preserve the UABI. When <<
819 unaligned accesses, the unaligned ac <<
820 <<
821 config RISCV_SLOW_UNALIGNED_ACCESS <<
822 bool "Assume the system supports slow <<
823 depends on NONPORTABLE <<
824 help <<
825 Assume that the system supports slow <<
826 kernel and userspace programs may no <<
827 that do not support unaligned memory <<
828 <<
829 config RISCV_EFFICIENT_UNALIGNED_ACCESS <<
830 bool "Assume the system supports fast <<
831 depends on NONPORTABLE <<
832 select DCACHE_WORD_ACCESS if MMU <<
833 select HAVE_EFFICIENT_UNALIGNED_ACCESS <<
834 help <<
835 Assume that the system supports fast <<
836 enabled, this option improves the pe <<
837 systems. However, the kernel and use <<
838 slowly, or will not be able to run a <<
839 support efficient unaligned memory a <<
840 296
841 endchoice !! 297 source "drivers/serial/Kconfig"
842 298
843 source "arch/riscv/Kconfig.vendor" !! 299 if !SUN4
>> 300 source "drivers/sbus/char/Kconfig"
>> 301 endif
844 302
845 endmenu # "Platform type" <<
846 303
847 menu "Kernel features" !! 304 menu "Block devices"
848 305
849 source "kernel/Kconfig.hz" !! 306 config BLK_DEV_FD
>> 307 bool "Normal floppy disk support"
>> 308 ---help---
>> 309 If you want to use the floppy disk drive(s) of your PC under Linux,
>> 310 say Y. Information about this driver, especially important for IBM
>> 311 Thinkpad users, is contained in <file:Documentation/floppy.txt>.
>> 312 That file also contains the location of the Floppy driver FAQ as
>> 313 well as location of the fdutils package used to configure additional
>> 314 parameters of the driver at run time.
850 315
851 config RISCV_SBI_V01 !! 316 To compile this driver as a module, choose M here: the
852 bool "SBI v0.1 support" !! 317 module will be called floppy.
853 depends on RISCV_SBI <<
854 help <<
855 This config allows kernel to use SBI <<
856 deprecated in future once legacy M-m <<
857 318
858 config RISCV_BOOT_SPINWAIT !! 319 config BLK_DEV_LOOP
859 bool "Spinwait booting method" !! 320 tristate "Loopback device support"
860 depends on SMP !! 321 ---help---
861 default y if RISCV_SBI_V01 || RISCV_M_ !! 322 Saying Y here will allow you to use a regular file as a block
862 help !! 323 device; you can then create a file system on that block device and
863 This enables support for booting Lin !! 324 mount it just as you would mount other block devices such as hard
864 spinwait method, all cores randomly !! 325 drive partitions, CD-ROM drives or floppy drives. The loop devices
865 gets chosen via lottery and all othe !! 326 are block special device files with major number 7 and typically
866 variable. This method cannot support !! 327 called /dev/loop0, /dev/loop1 etc.
867 scheme. It should be only enabled fo <<
868 on older firmware without SBI HSM ex <<
869 rely on ordered booting via SBI HSM <<
870 dynamically at runtime if the firmwa <<
871 <<
872 Since spinwait is incompatible with <<
873 NR_CPUS be large enough to contain t <<
874 hart to enter Linux. <<
875 <<
876 If unsure what to do here, say N. <<
877 <<
878 config ARCH_SUPPORTS_KEXEC <<
879 def_bool y <<
880 <<
881 config ARCH_SELECTS_KEXEC <<
882 def_bool y <<
883 depends on KEXEC <<
884 select HOTPLUG_CPU if SMP <<
885 <<
886 config ARCH_SUPPORTS_KEXEC_FILE <<
887 def_bool 64BIT <<
888 <<
889 config ARCH_SELECTS_KEXEC_FILE <<
890 def_bool y <<
891 depends on KEXEC_FILE <<
892 select HAVE_IMA_KEXEC if IMA <<
893 select KEXEC_ELF <<
894 <<
895 config ARCH_SUPPORTS_KEXEC_PURGATORY <<
896 def_bool ARCH_SUPPORTS_KEXEC_FILE <<
897 <<
898 config ARCH_SUPPORTS_CRASH_DUMP <<
899 def_bool y <<
900 <<
901 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATIO <<
902 def_bool CRASH_RESERVE <<
903 <<
904 config COMPAT <<
905 bool "Kernel support for 32-bit U-mode <<
906 default 64BIT <<
907 depends on 64BIT && MMU <<
908 help <<
909 This option enables support for a 32 <<
910 kernel at S-mode. riscv32-specific c <<
911 the user helper functions (vdso), si <<
912 ptrace interface are handled appropr <<
913 <<
914 If you want to execute 32-bit usersp <<
915 <<
916 config PARAVIRT <<
917 bool "Enable paravirtualization code" <<
918 depends on RISCV_SBI <<
919 help <<
920 This changes the kernel so it can mo <<
921 under a hypervisor, potentially impr <<
922 over full virtualization. <<
923 <<
924 config PARAVIRT_TIME_ACCOUNTING <<
925 bool "Paravirtual steal time accountin <<
926 depends on PARAVIRT <<
927 help <<
928 Select this option to enable fine gr <<
929 accounting. Time spent executing oth <<
930 the current vCPU is discounted from <<
931 that, there can be a small performan <<
932 <<
933 If in doubt, say N here. <<
934 <<
935 config RELOCATABLE <<
936 bool "Build a relocatable kernel" <<
937 depends on MMU && 64BIT && !XIP_KERNEL <<
938 select MODULE_SECTIONS if MODULES <<
939 help <<
940 This builds a kernel as a Position I <<
941 which retains all relocation metadat <<
942 kernel binary at runtime to a differ <<
943 address it was linked at. <<
944 Since RISCV uses the RELA relocation <<
945 relocation pass at runtime even if t <<
946 same address it was linked at. <<
947 <<
948 If unsure, say N. <<
949 <<
950 config RANDOMIZE_BASE <<
951 bool "Randomize the address of the ker <<
952 select RELOCATABLE <<
953 depends on MMU && 64BIT && !XIP_KERNEL <<
954 help <<
955 Randomizes the virtual address at wh <<
956 loaded, as a security feature that d <<
957 relying on knowledge of the location <<
958 <<
959 It is the bootloader's job to provid <<
960 random u64 value in /chosen/kaslr-se <<
961 <<
962 When booting via the UEFI stub, it w <<
963 EFI_RNG_PROTOCOL implementation (if <<
964 to the kernel proper. In addition, i <<
965 location of the kernel Image as well <<
966 328
967 If unsure, say N. !! 329 This is useful if you want to check an ISO 9660 file system before
>> 330 burning the CD, or if you want to use floppy images without first
>> 331 writing them to floppy. Furthermore, some Linux distributions avoid
>> 332 the need for a dedicated Linux partition by keeping their complete
>> 333 root file system inside a DOS FAT file using this loop device
>> 334 driver.
968 335
969 endmenu # "Kernel features" !! 336 The loop device driver can also be used to "hide" a file system in a
>> 337 disk partition, floppy, or regular file, either using encryption
>> 338 (scrambling the data) or steganography (hiding the data in the low
>> 339 bits of, say, a sound file). This is also safe if the file resides
>> 340 on a remote file server. If you want to do this, you will first have
>> 341 to acquire and install a kernel patch from
>> 342 <ftp://ftp.kerneli.org/pub/kerneli/>, and then you need to
>> 343 say Y to this option.
970 344
971 menu "Boot options" !! 345 Note that alternative ways to use encrypted file systems are
>> 346 provided by the cfs package, which can be gotten from
>> 347 <ftp://ftp.kerneli.org/pub/kerneli/net-source/>, and the newer tcfs
>> 348 package, available at <http://tcfs.dia.unisa.it/>. You do not need
>> 349 to say Y here if you want to use one of these. However, using cfs
>> 350 requires saying Y to "NFS file system support" below while using
>> 351 tcfs requires applying a kernel patch. An alternative steganography
>> 352 solution is provided by StegFS, also available from
>> 353 <ftp://ftp.kerneli.org/pub/kerneli/net-source/>.
972 354
973 config CMDLINE !! 355 To use the loop device, you need the losetup utility and a recent
974 string "Built-in kernel command line" !! 356 version of the mount program, both contained in the util-linux
975 help !! 357 package. The location and current version number of util-linux is
976 For most platforms, the arguments fo !! 358 contained in the file <file:Documentation/Changes>.
977 are provided at run-time, during boo <<
978 where either no arguments are being <<
979 arguments are insufficient or even i <<
980 <<
981 When that occurs, it is possible to <<
982 line here and choose how the kernel <<
983 <<
984 choice <<
985 prompt "Built-in command line usage" <<
986 depends on CMDLINE != "" <<
987 default CMDLINE_FALLBACK <<
988 help <<
989 Choose how the kernel will handle th <<
990 line. <<
991 359
992 config CMDLINE_FALLBACK !! 360 Note that this loop device has nothing to do with the loopback
993 bool "Use bootloader kernel arguments !! 361 device used for network connections from the machine to itself.
994 help <<
995 Use the built-in command line as fal <<
996 during boot. This is the default beh <<
997 362
998 config CMDLINE_EXTEND !! 363 To compile this driver as a module, choose M here: the
999 bool "Extend bootloader kernel argumen !! 364 module will be called loop.
1000 help <<
1001 The command-line arguments provided <<
1002 appended to the built-in command li <<
1003 cases where the provided arguments <<
1004 you don't want to or cannot modify <<
1005 365
1006 config CMDLINE_FORCE !! 366 Most users will answer N here.
1007 bool "Always use the default kernel c <<
1008 help <<
1009 Always use the built-in command lin <<
1010 boot. This is useful in case you ne <<
1011 command line on systems where you d <<
1012 over it. <<
1013 367
1014 endchoice !! 368 config BLK_DEV_NBD
>> 369 tristate "Network block device support"
>> 370 depends on NET
>> 371 ---help---
>> 372 Saying Y here will allow your computer to be a client for network
>> 373 block devices, i.e. it will be able to use block devices exported by
>> 374 servers (mount file systems on them etc.). Communication between
>> 375 client and server works over TCP/IP networking, but to the client
>> 376 program this is hidden: it looks like a regular local file access to
>> 377 a block device special file such as /dev/nd0.
1015 378
1016 config EFI_STUB !! 379 Network block devices also allows you to run a block-device in
1017 bool !! 380 userland (making server and client physically the same computer,
>> 381 communicating using the loopback network device).
1018 382
1019 config EFI !! 383 Read <file:Documentation/nbd.txt> for more information, especially
1020 bool "UEFI runtime support" !! 384 about where to find the server code, which runs in user space and
1021 depends on OF && !XIP_KERNEL !! 385 does not need special kernel support.
1022 depends on MMU <<
1023 default y <<
1024 select ARCH_SUPPORTS_ACPI if 64BIT <<
1025 select EFI_GENERIC_STUB <<
1026 select EFI_PARAMS_FROM_FDT <<
1027 select EFI_RUNTIME_WRAPPERS <<
1028 select EFI_STUB <<
1029 select LIBFDT <<
1030 select RISCV_ISA_C <<
1031 select UCS2_STRING <<
1032 help <<
1033 This option provides support for ru <<
1034 by UEFI firmware (such as non-volat <<
1035 clock, and platform reset). A UEFI <<
1036 allow the kernel to be booted as an <<
1037 is only useful on systems that have <<
1038 <<
1039 config DMI <<
1040 bool "Enable support for SMBIOS (DMI) <<
1041 depends on EFI <<
1042 default y <<
1043 help <<
1044 This enables SMBIOS/DMI feature for <<
1045 386
1046 This option is only useful on syste !! 387 Note that this has nothing to do with the network file systems NFS
1047 However, even with this option, the !! 388 or Coda; you can say N here even if you intend to use NFS or Coda.
1048 continue to boot on existing non-UE !! 389
1049 !! 390 To compile this driver as a module, choose M here: the
1050 config CC_HAVE_STACKPROTECTOR_TLS !! 391 module will be called nbd.
1051 def_bool $(cc-option,-mstack-protecto <<
1052 <<
1053 config STACKPROTECTOR_PER_TASK <<
1054 def_bool y <<
1055 depends on !RANDSTRUCT <<
1056 depends on STACKPROTECTOR && CC_HAVE_ <<
1057 <<
1058 config PHYS_RAM_BASE_FIXED <<
1059 bool "Explicitly specified physical R <<
1060 depends on NONPORTABLE <<
1061 default n <<
1062 <<
1063 config PHYS_RAM_BASE <<
1064 hex "Platform Physical RAM address" <<
1065 depends on PHYS_RAM_BASE_FIXED <<
1066 default "0x80000000" <<
1067 help <<
1068 This is the physical address of RAM <<
1069 explicitly specified to run early r <<
1070 from flash to RAM. <<
1071 <<
1072 config XIP_KERNEL <<
1073 bool "Kernel Execute-In-Place from RO <<
1074 depends on MMU && SPARSEMEM && NONPOR <<
1075 # This prevents XIP from being enable <<
1076 # fail to build since XIP doesn't sup <<
1077 depends on !COMPILE_TEST <<
1078 select PHYS_RAM_BASE_FIXED <<
1079 help <<
1080 Execute-In-Place allows the kernel <<
1081 directly addressable by the CPU, su <<
1082 space since the text section of the <<
1083 to RAM. Read-write sections, such <<
1084 are still copied to RAM. The XIP k <<
1085 it has to run directly from flash, <<
1086 store it. The flash address used t <<
1087 and for storing it, is configuratio <<
1088 say Y here, you must know the prope <<
1089 store the kernel image depending on <<
1090 <<
1091 Also note that the make target beco <<
1092 "make zImage" or "make Image". The <<
1093 ROM memory will be arch/riscv/boot/ <<
1094 <<
1095 SPARSEMEM is required because the k <<
1096 flash resident are not backed by me <<
1097 a struct page on those regions will <<
1098 392
1099 If unsure, say N. 393 If unsure, say N.
1100 394
1101 config XIP_PHYS_ADDR !! 395 source "drivers/md/Kconfig"
1102 hex "XIP Kernel Physical Location" <<
1103 depends on XIP_KERNEL <<
1104 default "0x21000000" <<
1105 help <<
1106 This is the physical address in you <<
1107 be linked for and stored to. This <<
1108 own flash usage. <<
1109 396
1110 config RISCV_ISA_FALLBACK !! 397 config BLK_DEV_RAM
1111 bool "Permit falling back to parsing !! 398 tristate "RAM disk support"
1112 default y !! 399 ---help---
>> 400 Saying Y here will allow you to use a portion of your RAM memory as
>> 401 a block device, so that you can make file systems on it, read and
>> 402 write to it and do all the other things that you can do with normal
>> 403 block devices (such as hard drives). It is usually used to load and
>> 404 store a copy of a minimal root file system off of a floppy into RAM
>> 405 during the initial install of Linux.
>> 406
>> 407 Note that the kernel command line option "ramdisk=XX" is now
>> 408 obsolete. For details, read <file:Documentation/ramdisk.txt>.
>> 409
>> 410 To compile this driver as a module, choose M here: the
>> 411 module will be called rd.
>> 412
>> 413 Most normal users won't need the RAM disk functionality, and can
>> 414 thus say N here.
>> 415
>> 416 config BLK_DEV_RAM_SIZE
>> 417 int "Default RAM disk size"
>> 418 depends on BLK_DEV_RAM
>> 419 default "4096"
1113 help 420 help
1114 Parsing the "riscv,isa" devicetree !! 421 The default value is 4096. Only change this if you know what are
1115 replaced by a list of explicitly de !! 422 you doing. If you are using IBM S/390, then set this to 8192.
1116 with existing platforms, the kernel !! 423
1117 "riscv,isa" property if the replace !! 424 config BLK_DEV_INITRD
1118 !! 425 bool "Initial RAM disk (initrd) support"
1119 Selecting N here will result in a k !! 426 depends on BLK_DEV_RAM=y
1120 fallback, unless the commandline "r <<
1121 present. <<
1122 <<
1123 Please see the dt-binding, located <<
1124 Documentation/devicetree/bindings/r <<
1125 on the replacement properties, "ris <<
1126 "riscv,isa-extensions". <<
1127 <<
1128 config BUILTIN_DTB <<
1129 bool "Built-in device tree" <<
1130 depends on OF && NONPORTABLE <<
1131 help 427 help
1132 Build a device tree into the Linux !! 428 The initial RAM disk is a RAM disk that is loaded by the boot loader
1133 This option should be selected if n !! 429 (loadlin or lilo) and that is mounted as root before the normal boot
1134 If unsure, say N. !! 430 procedure. It is typically used to load modules needed to mount the
>> 431 "real" root file system, etc. See <file:Documentation/initrd.txt>
>> 432 for details.
>> 433
>> 434 endmenu
>> 435
>> 436 # Don't frighten a common SBus user
>> 437 if PCI
>> 438
>> 439 source "drivers/ide/Kconfig"
>> 440
>> 441 endif
>> 442
>> 443 source "drivers/isdn/Kconfig"
>> 444
>> 445 source "drivers/scsi/Kconfig"
>> 446
>> 447 source "drivers/fc4/Kconfig"
>> 448
>> 449 source "net/Kconfig"
1135 450
>> 451 # This one must be before the filesystem configs. -DaveM
1136 452
1137 config BUILTIN_DTB_SOURCE !! 453 menu "Unix98 PTY support"
1138 string "Built-in device tree source" !! 454
1139 depends on BUILTIN_DTB !! 455 config UNIX98_PTYS
>> 456 bool "Unix98 PTY support"
>> 457 ---help---
>> 458 A pseudo terminal (PTY) is a software device consisting of two
>> 459 halves: a master and a slave. The slave device behaves identical to
>> 460 a physical terminal; the master device is used by a process to
>> 461 read data from and write data to the slave, thereby emulating a
>> 462 terminal. Typical programs for the master side are telnet servers
>> 463 and xterms.
>> 464
>> 465 Linux has traditionally used the BSD-like names /dev/ptyxx for
>> 466 masters and /dev/ttyxx for slaves of pseudo terminals. This scheme
>> 467 has a number of problems. The GNU C library glibc 2.1 and later,
>> 468 however, supports the Unix98 naming standard: in order to acquire a
>> 469 pseudo terminal, a process opens /dev/ptmx; the number of the pseudo
>> 470 terminal is then made available to the process and the pseudo
>> 471 terminal slave can be accessed as /dev/pts/<number>. What was
>> 472 traditionally /dev/ttyp2 will then be /dev/pts/2, for example.
>> 473
>> 474 The entries in /dev/pts/ are created on the fly by a virtual
>> 475 file system; therefore, if you say Y here you should say Y to
>> 476 "/dev/pts file system for Unix98 PTYs" as well.
>> 477
>> 478 If you want to say Y here, you need to have the C library glibc 2.1
>> 479 or later (equal to libc-6.1, check with "ls -l /lib/libc.so.*").
>> 480 Read the instructions in <file:Documentation/Changes> pertaining to
>> 481 pseudo terminals. It's safe to say N.
>> 482
>> 483 config UNIX98_PTY_COUNT
>> 484 int "Maximum number of Unix98 PTYs in use (0-2048)"
>> 485 depends on UNIX98_PTYS
>> 486 default "256"
1140 help 487 help
1141 DTS file path (without suffix, rela !! 488 The maximum number of Unix98 PTYs that can be used at any one time.
1142 for the DTS file that will be used !! 489 The default is 256, and should be enough for desktop systems. Server
1143 kernel. !! 490 machines which support incoming telnet/rlogin/ssh connections and/or
>> 491 serve several X terminals may want to increase this: every incoming
>> 492 connection and every xterm uses up one PTY.
1144 493
1145 endmenu # "Boot options" !! 494 When not in use, each additional set of 256 PTYs occupy
>> 495 approximately 8 KB of kernel memory on 32-bit architectures.
1146 496
1147 config PORTABLE !! 497 endmenu
1148 bool !! 498
1149 default !NONPORTABLE !! 499 source "drivers/input/Kconfig"
1150 select EFI <<
1151 select MMU <<
1152 select OF <<
1153 500
1154 config ARCH_PROC_KCORE_TEXT !! 501 source "fs/Kconfig"
1155 def_bool y <<
1156 502
1157 menu "Power management options" !! 503 source "sound/Kconfig"
1158 504
1159 source "kernel/power/Kconfig" !! 505 source "drivers/usb/Kconfig"
1160 506
1161 config ARCH_HIBERNATION_POSSIBLE !! 507 menu "Watchdog"
1162 def_bool y !! 508
>> 509 config SOFT_WATCHDOG
>> 510 tristate "Software watchdog"
>> 511 help
>> 512 A software monitoring watchdog. This will fail to reboot your system
>> 513 from some situations that the hardware watchdog will recover
>> 514 from. Equally it's a lot cheaper to install.
1163 515
1164 config ARCH_HIBERNATION_HEADER !! 516 To compile this driver as a module, choose M here: the
1165 def_bool HIBERNATION !! 517 module will be called softdog.
1166 518
1167 config ARCH_SUSPEND_POSSIBLE !! 519 endmenu
1168 def_bool y <<
1169 520
1170 endmenu # "Power management options" <<
1171 521
1172 menu "CPU Power Management" !! 522 menu "Kernel hacking"
>> 523
>> 524 config DEBUG_SLAB
>> 525 bool "Debug memory allocations"
>> 526
>> 527 config MAGIC_SYSRQ
>> 528 bool "Magic SysRq key"
>> 529 help
>> 530 If you say Y here, you will have some control over the system even
>> 531 if the system crashes for example during kernel debugging (e.g., you
>> 532 will be able to flush the buffer cache to disk, reboot the system
>> 533 immediately or dump some status information). This is accomplished
>> 534 by pressing various keys while holding SysRq (Alt+PrintScreen). It
>> 535 also works on a serial console (on PC hardware at least), if you
>> 536 send a BREAK and then within 5 seconds a command keypress. The
>> 537 keys are documented in <file:Documentation/sysrq.txt>. Don't say Y
>> 538 unless you really know what this hack does.
>> 539
>> 540 config DEBUG_SPINLOCK
>> 541 bool "Spinlock debugging"
>> 542
>> 543 config DEBUG_SPINLOCK_SLEEP
>> 544 bool "Sleep-inside-spinlock checking"
>> 545 help
>> 546 If you say Y here, various routines which may sleep will become very
>> 547 noisy if they are called with a spinlock held.
>> 548
>> 549 config DEBUG_BUGVERBOSE
>> 550 bool "Verbose BUG() reporting (adds 70K)"
>> 551 help
>> 552 Say Y here to make BUG() panics output the file name and line number
>> 553 of the BUG call as well as the EIP and oops trace. This aids
>> 554 debugging but costs about 70-100K of memory.
1173 555
1174 source "drivers/cpuidle/Kconfig" !! 556 endmenu
1175 557
1176 source "drivers/cpufreq/Kconfig" !! 558 source "security/Kconfig"
1177 559
1178 endmenu # "CPU Power Management" !! 560 source "crypto/Kconfig"
1179 561
1180 source "arch/riscv/kvm/Kconfig" !! 562 source "lib/Kconfig"
1181 563
1182 source "drivers/acpi/Kconfig" <<
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