1 # SPDX-License-Identifier: GPL-2.0-only !! 1 # SPDX-License-Identifier: GPL-2.0
2 # !! 2 config ALPHA
3 # For a description of the syntax of this conf <<
4 # see Documentation/kbuild/kconfig-language.rs <<
5 # <<
6 <<
7 config 64BIT <<
8 bool <<
9 <<
10 config 32BIT <<
11 bool 3 bool
12 !! 4 default y
13 config RISCV !! 5 select ARCH_MIGHT_HAVE_PC_PARPORT
14 def_bool y !! 6 select ARCH_MIGHT_HAVE_PC_SERIO
15 select ACPI_GENERIC_GSI if ACPI !! 7 select ARCH_NO_PREEMPT
16 select ACPI_MCFG if (ACPI && PCI) !! 8 select ARCH_NO_SG_CHAIN
17 select ACPI_PPTT if ACPI !! 9 select ARCH_USE_CMPXCHG_LOCKREF
18 select ACPI_REDUCED_HARDWARE_ONLY if A !! 10 select FORCE_PCI if !ALPHA_JENSEN
19 select ACPI_SPCR_TABLE if ACPI !! 11 select PCI_DOMAINS if PCI
20 select ARCH_DMA_DEFAULT_COHERENT !! 12 select PCI_SYSCALL if PCI
21 select ARCH_ENABLE_HUGEPAGE_MIGRATION !! 13 select HAVE_AOUT
22 select ARCH_ENABLE_MEMORY_HOTPLUG if S !! 14 select HAVE_IDE
23 select ARCH_ENABLE_MEMORY_HOTREMOVE if !! 15 select HAVE_OPROFILE
24 select ARCH_ENABLE_SPLIT_PMD_PTLOCK if !! 16 select HAVE_PCSPKR_PLATFORM
25 select ARCH_ENABLE_THP_MIGRATION if TR !! 17 select HAVE_PERF_EVENTS
26 select ARCH_HAS_BINFMT_FLAT !! 18 select NEED_DMA_MAP_STATE
27 select ARCH_HAS_CURRENT_STACK_POINTER !! 19 select NEED_SG_DMA_LENGTH
28 select ARCH_HAS_DEBUG_VIRTUAL if MMU !! 20 select VIRT_TO_BUS
29 select ARCH_HAS_DEBUG_VM_PGTABLE !! 21 select GENERIC_IRQ_PROBE
30 select ARCH_HAS_DEBUG_WX !! 22 select GENERIC_PCI_IOMAP if PCI
31 select ARCH_HAS_FAST_MULTIPLIER !! 23 select AUTO_IRQ_AFFINITY if SMP
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 24 select GENERIC_IRQ_SHOW
108 select GENERIC_IRQ_SHOW_LEVEL !! 25 select ARCH_WANT_IPC_PARSE_VERSION
109 select GENERIC_LIB_DEVMEM_IS_ALLOWED !! 26 select ARCH_HAVE_NMI_SAFE_CMPXCHG
110 select GENERIC_PCI_IOMAP !! 27 select AUDIT_ARCH
111 select GENERIC_PTDUMP if MMU !! 28 select GENERIC_CLOCKEVENTS
112 select GENERIC_SCHED_CLOCK !! 29 select GENERIC_CPU_VULNERABILITIES
113 select GENERIC_SMP_IDLE_THREAD 30 select GENERIC_SMP_IDLE_THREAD
114 select GENERIC_TIME_VSYSCALL if MMU && !! 31 select GENERIC_STRNCPY_FROM_USER
115 select GENERIC_VDSO_TIME_NS if HAVE_GE !! 32 select GENERIC_STRNLEN_USER
116 select HARDIRQS_SW_RESEND <<
117 select HAS_IOPORT if MMU <<
118 select HAVE_ARCH_AUDITSYSCALL 33 select HAVE_ARCH_AUDITSYSCALL
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ !! 34 select HAVE_MOD_ARCH_SPECIFIC
120 select HAVE_ARCH_HUGE_VMAP if MMU && 6 !! 35 select MODULES_USE_ELF_RELA
121 select HAVE_ARCH_JUMP_LABEL if !XIP_KE !! 36 select ODD_RT_SIGACTION
122 select HAVE_ARCH_JUMP_LABEL_RELATIVE i !! 37 select OLD_SIGSUSPEND
123 select HAVE_ARCH_KASAN if MMU && 64BIT !! 38 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
124 select HAVE_ARCH_KASAN_VMALLOC if MMU !! 39 select MMU_GATHER_NO_RANGE
125 select HAVE_ARCH_KFENCE if MMU && 64BI !! 40 help
126 select HAVE_ARCH_KGDB if !XIP_KERNEL !! 41 The Alpha is a 64-bit general-purpose processor designed and
127 select HAVE_ARCH_KGDB_QXFER_PKT !! 42 marketed by the Digital Equipment Corporation of blessed memory,
128 select HAVE_ARCH_MMAP_RND_BITS if MMU !! 43 now Hewlett-Packard. The Alpha Linux project has a home page at
129 select HAVE_ARCH_MMAP_RND_COMPAT_BITS !! 44 <http://www.alphalinux.org/>.
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 45
238 # https://github.com/llvm/llvm-project/commit/ !! 46 config 64BIT
239 config ARCH_HAS_BROKEN_DWARF5 <<
240 def_bool y 47 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 <<
268 help <<
269 Select this option if you want to ru <<
270 without the assistance of any other <<
271 <<
272 # set if we are running in S-mode and can use <<
273 config RISCV_SBI <<
274 bool <<
275 depends on !RISCV_M_MODE <<
276 default y <<
277 48
278 config MMU 49 config MMU
279 bool "MMU-based Paged Memory Managemen !! 50 bool
280 default y 51 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 52
307 config ARCH_SELECT_MEMORY_MODEL !! 53 config ARCH_HAS_ILOG2_U32
308 def_bool ARCH_SPARSEMEM_ENABLE !! 54 bool
309 !! 55 default n
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 56
321 config GENERIC_BUG_RELATIVE_POINTERS !! 57 config ARCH_HAS_ILOG2_U64
322 bool 58 bool
>> 59 default n
323 60
324 config GENERIC_CALIBRATE_DELAY 61 config GENERIC_CALIBRATE_DELAY
325 def_bool y !! 62 bool
326 !! 63 default y
327 config GENERIC_CSUM <<
328 def_bool y <<
329 <<
330 config GENERIC_HWEIGHT <<
331 def_bool y <<
332 64
333 config FIX_EARLYCON_MEM !! 65 config ZONE_DMA
334 def_bool MMU !! 66 bool
>> 67 default y
335 68
336 config ILLEGAL_POINTER_VALUE !! 69 config GENERIC_ISA_DMA
337 hex !! 70 bool
338 default 0 if 32BIT !! 71 default y
339 default 0xdead000000000000 if 64BIT <<
340 72
341 config PGTABLE_LEVELS 73 config PGTABLE_LEVELS
342 int 74 int
343 default 5 if 64BIT !! 75 default 3
344 default 2 <<
345 <<
346 config LOCKDEP_SUPPORT <<
347 def_bool y <<
348 76
349 config RISCV_DMA_NONCOHERENT !! 77 config AUDIT_ARCH
350 bool 78 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 <<
357 config RISCV_NONSTANDARD_CACHE_OPS <<
358 bool <<
359 help <<
360 This enables function pointer suppor <<
361 systems to handle cache management. <<
362 79
363 config AS_HAS_INSN !! 80 menu "System setup"
364 def_bool $(as-instr,.insn r 51$(comma) <<
365 81
366 config AS_HAS_OPTION_ARCH !! 82 choice
367 # https://github.com/llvm/llvm-project !! 83 prompt "Alpha system type"
368 def_bool y !! 84 default ALPHA_GENERIC
369 depends on $(as-instr, .option arch$(c !! 85 ---help---
370 !! 86 This is the system type of your hardware. A "generic" kernel will
371 source "arch/riscv/Kconfig.socs" !! 87 run on any supported Alpha system. However, if you configure a
372 source "arch/riscv/Kconfig.errata" !! 88 kernel for your specific system, it will be faster and smaller.
373 !! 89
374 menu "Platform type" !! 90 To find out what type of Alpha system you have, you may want to
375 !! 91 check out the Linux/Alpha FAQ, accessible on the WWW from
376 config NONPORTABLE !! 92 <http://www.alphalinux.org/>. In summary:
377 bool "Allow configurations that result !! 93
>> 94 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366
>> 95 Alpha-XL XL-233, XL-266
>> 96 AlphaBook1 Alpha laptop
>> 97 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
>> 98 Cabriolet AlphaPC64, AlphaPCI64
>> 99 DP264 DP264 / DS20 / ES40 / DS10 / DS10L
>> 100 EB164 EB164 21164 evaluation board
>> 101 EB64+ EB64+ 21064 evaluation board
>> 102 EB66 EB66 21066 evaluation board
>> 103 EB66+ EB66+ 21066 evaluation board
>> 104 Jensen DECpc 150, DEC 2000 models 300, 500
>> 105 LX164 AlphaPC164-LX
>> 106 Lynx AS 2100A
>> 107 Miata Personal Workstation 433/500/600 a/au
>> 108 Marvel AlphaServer ES47 / ES80 / GS1280
>> 109 Mikasa AS 1000
>> 110 Noname AXPpci33, UDB (Multia)
>> 111 Noritake AS 1000A, AS 600A, AS 800
>> 112 PC164 AlphaPC164
>> 113 Rawhide AS 1200, AS 4000, AS 4100
>> 114 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX
>> 115 SX164 AlphaPC164-SX
>> 116 Sable AS 2000, AS 2100
>> 117 Shark DS 20L
>> 118 Takara Takara (OEM)
>> 119 Titan AlphaServer ES45 / DS25 / DS15
>> 120 Wildfire AlphaServer GS 40/80/160/320
>> 121
>> 122 If you don't know what to do, choose "generic".
>> 123
>> 124 config ALPHA_GENERIC
>> 125 bool "Generic"
>> 126 depends on TTY
>> 127 select HAVE_EISA
>> 128 help
>> 129 A generic kernel will run on all supported Alpha hardware.
>> 130
>> 131 config ALPHA_ALCOR
>> 132 bool "Alcor/Alpha-XLT"
>> 133 select HAVE_EISA
>> 134 help
>> 135 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
>> 136 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
>> 137 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
>> 138 controller (256-bit memory bus) and a PCI interface. It also does
>> 139 all the work required to support an external Bcache and to maintain
>> 140 memory coherence when a PCI device DMAs into (or out of) memory.
>> 141
>> 142 config ALPHA_XL
>> 143 bool "Alpha-XL"
>> 144 help
>> 145 XL-233 and XL-266-based Alpha systems.
>> 146
>> 147 config ALPHA_BOOK1
>> 148 bool "AlphaBook1"
>> 149 help
>> 150 Dec AlphaBook1/Burns Alpha-based laptops.
>> 151
>> 152 config ALPHA_AVANTI_CH
>> 153 bool "Avanti"
>> 154
>> 155 config ALPHA_CABRIOLET
>> 156 bool "Cabriolet"
>> 157 help
>> 158 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now
>> 159 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
>> 160 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
>> 161 Bcache SIMMs. Requires power supply with 3.3V output.
>> 162
>> 163 config ALPHA_DP264
>> 164 bool "DP264"
>> 165 help
>> 166 Various 21264 systems with the tsunami core logic chipset.
>> 167 API Networks: 264DP, UP2000(+), CS20;
>> 168 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
>> 169
>> 170 config ALPHA_EB164
>> 171 bool "EB164"
>> 172 help
>> 173 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has
>> 174 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
>> 175 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in
>> 176 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
>> 177 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized
>> 178 motherboard. Requires power supply with 3.3V output.
>> 179
>> 180 config ALPHA_EB64P_CH
>> 181 bool "EB64+"
>> 182
>> 183 config ALPHA_EB66
>> 184 bool "EB66"
>> 185 help
>> 186 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is
>> 187 identical to EB64+. Baby PC-AT size. Runs from standard PC power
>> 188 supply. The EB66 schematic was published as a marketing poster
>> 189 advertising the 21066 as "the first microprocessor in the world with
>> 190 embedded PCI".
>> 191
>> 192 config ALPHA_EB66P
>> 193 bool "EB66+"
>> 194 help
>> 195 Later variant of the EB66 board.
>> 196
>> 197 config ALPHA_EIGER
>> 198 bool "Eiger"
>> 199 help
>> 200 Apparently an obscure OEM single-board computer based on the
>> 201 Typhoon/Tsunami chipset family. Information on it is scanty.
>> 202
>> 203 config ALPHA_JENSEN
>> 204 bool "Jensen"
>> 205 depends on BROKEN
>> 206 select HAVE_EISA
>> 207 help
>> 208 DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
>> 209 of the first-generation Alpha systems. A number of these systems
>> 210 seem to be available on the second- hand market. The Jensen is a
>> 211 floor-standing tower system which originally used a 150MHz 21064 It
>> 212 used programmable logic to interface a 486 EISA I/O bridge to the
>> 213 CPU.
>> 214
>> 215 config ALPHA_LX164
>> 216 bool "LX164"
>> 217 help
>> 218 A technical overview of this board is available at
>> 219 <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
>> 220
>> 221 config ALPHA_LYNX
>> 222 bool "Lynx"
>> 223 select HAVE_EISA
>> 224 help
>> 225 AlphaServer 2100A-based systems.
>> 226
>> 227 config ALPHA_MARVEL
>> 228 bool "Marvel"
>> 229 help
>> 230 AlphaServer ES47 / ES80 / GS1280 based on EV7.
>> 231
>> 232 config ALPHA_MIATA
>> 233 bool "Miata"
>> 234 select HAVE_EISA
>> 235 help
>> 236 The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
>> 237 or 600au).
>> 238
>> 239 config ALPHA_MIKASA
>> 240 bool "Mikasa"
>> 241 help
>> 242 AlphaServer 1000-based Alpha systems.
>> 243
>> 244 config ALPHA_NAUTILUS
>> 245 bool "Nautilus"
>> 246 help
>> 247 Alpha systems based on the AMD 751 & ALI 1543C chipsets.
>> 248
>> 249 config ALPHA_NONAME_CH
>> 250 bool "Noname"
>> 251
>> 252 config ALPHA_NORITAKE
>> 253 bool "Noritake"
>> 254 select HAVE_EISA
378 help 255 help
379 RISC-V kernel binaries are compatibl !! 256 AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
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. 257 systems.
388 258
389 If unsure, say N. !! 259 config ALPHA_PC164
>> 260 bool "PC164"
390 261
391 choice !! 262 config ALPHA_P2K
392 prompt "Base ISA" !! 263 bool "Platform2000"
393 default ARCH_RV64I !! 264
>> 265 config ALPHA_RAWHIDE
>> 266 bool "Rawhide"
>> 267 select HAVE_EISA
394 help 268 help
395 This selects the base ISA that this !! 269 AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
396 the target platform. !! 270 See HOWTO at
>> 271 <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
397 272
398 config ARCH_RV32I !! 273 config ALPHA_RUFFIAN
399 bool "RV32I" !! 274 bool "Ruffian"
400 depends on NONPORTABLE !! 275 help
401 select 32BIT !! 276 Samsung APC164UX. There is a page on known problems and workarounds
402 select GENERIC_LIB_ASHLDI3 !! 277 at <http://www.alphalinux.org/faq/FAQ-11.html>.
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 <<
412 278
413 endchoice !! 279 config ALPHA_RX164
>> 280 bool "RX164"
414 281
415 # We must be able to map all physical memory i !! 282 config ALPHA_SX164
416 # is still a bit more efficient when generatin !! 283 bool "SX164"
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 <<
428 284
429 config MODULE_SECTIONS !! 285 config ALPHA_SABLE
430 bool !! 286 bool "Sable"
431 select HAVE_MOD_ARCH_SPECIFIC !! 287 select HAVE_EISA
432 <<
433 config SMP <<
434 bool "Symmetric Multi-Processing" <<
435 help 288 help
436 This enables support for systems wit !! 289 Digital AlphaServer 2000 and 2100-based systems.
437 you say N here, the kernel will run <<
438 multiprocessor machines, but will us <<
439 multiprocessor machine. If you say Y <<
440 on many, but not all, single process <<
441 processor machine, the kernel will r <<
442 here. <<
443 290
444 If you don't know what to do here, s !! 291 config ALPHA_SHARK
>> 292 bool "Shark"
445 293
446 config SCHED_MC !! 294 config ALPHA_TAKARA
447 bool "Multi-core scheduler support" !! 295 bool "Takara"
448 depends on SMP <<
449 help 296 help
450 Multi-core scheduler support improve !! 297 Alpha 11164-based OEM single-board computer.
451 making when dealing with multi-core <<
452 increased overhead in some places. I <<
453 298
454 config NR_CPUS !! 299 config ALPHA_TITAN
455 int "Maximum number of CPUs (2-512)" !! 300 bool "Titan"
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 <<
466 select GENERIC_IRQ_MIGRATION <<
467 help 301 help
>> 302 AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
468 303
469 Say Y here to experiment with turnin !! 304 config ALPHA_WILDFIRE
470 can be controlled through /sys/devic !! 305 bool "Wildfire"
471 <<
472 Say N if you want to disable CPU hot <<
473 <<
474 choice <<
475 prompt "CPU Tuning" <<
476 default TUNE_GENERIC <<
477 <<
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 306 help
495 Enable NUMA (Non-Uniform Memory Acce !! 307 AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
496 <<
497 The kernel will try to allocate memo <<
498 local memory of the CPU and add some <<
499 308
500 config NODES_SHIFT !! 309 endchoice
501 int "Maximum NUMA Nodes (as a power of <<
502 range 1 10 <<
503 default "2" <<
504 depends on NUMA <<
505 help <<
506 Specify the maximum number of NUMA N <<
507 system. Increases memory reserved t <<
508 310
509 config RISCV_ALTERNATIVE !! 311 # clear all implied options (don't want default values for those):
>> 312 # Most of these machines have ISA slots; not exactly sure which don't,
>> 313 # and this doesn't activate hordes of code, so do it always.
>> 314 config ISA
510 bool 315 bool
511 depends on !XIP_KERNEL !! 316 default y
512 help 317 help
513 This Kconfig allows the kernel to au !! 318 Find out whether you have ISA slots on your motherboard. ISA is the
514 erratum or cpufeature required by th !! 319 name of a bus system, i.e. the way the CPU talks to the other stuff
515 time. The code patching overhead is !! 320 inside your box. Other bus systems are PCI, EISA, MicroChannel
516 once at boot and once on each module !! 321 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
>> 322 newer boards don't support it. If you have ISA, say Y, otherwise N.
517 323
518 config RISCV_ALTERNATIVE_EARLY !! 324 config ISA_DMA_API
519 bool 325 bool
520 depends on RISCV_ALTERNATIVE !! 326 default y
521 help <<
522 Allows early patching of the kernel <<
523 327
524 config RISCV_ISA_C !! 328 config ALPHA_NONAME
525 bool "Emit compressed instructions whe !! 329 bool
>> 330 depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
526 default y 331 default y
527 help 332 help
528 Adds "C" to the ISA subsets that the !! 333 The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
529 when building Linux, which results i !! 334 UDB). This design was produced by Digital's Technical OEM (TOEM)
530 Linux binary. !! 335 group. It uses the 21066 processor running at 166MHz or 233MHz. It
>> 336 is a baby-AT size, and runs from a standard PC power supply. It has
>> 337 5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
>> 338 2 versions, with either PS/2 or large DIN connectors for the
>> 339 keyboard.
531 340
532 If you don't know what to do here, s !! 341 config ALPHA_EV4
>> 342 bool
>> 343 depends on ALPHA_JENSEN || (ALPHA_SABLE && !ALPHA_GAMMA) || ALPHA_LYNX || ALPHA_NORITAKE && !ALPHA_PRIMO || ALPHA_MIKASA && !ALPHA_PRIMO || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL || ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
>> 344 default y if !ALPHA_LYNX
533 345
534 config RISCV_ISA_SVNAPOT !! 346 config ALPHA_LCA
535 bool "Svnapot extension support for su !! 347 bool
536 depends on 64BIT && MMU !! 348 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
537 depends on RISCV_ALTERNATIVE <<
538 default y 349 default y
539 help <<
540 Allow kernel to detect the Svnapot I <<
541 time and enable its usage. <<
542 <<
543 The Svnapot extension is used to mar <<
544 of contiguous virtual-to-physical tr <<
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 <<
550 350
551 If you don't know what to do here, s !! 351 config ALPHA_APECS
>> 352 bool
>> 353 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
>> 354 default y
552 355
553 config RISCV_ISA_SVPBMT !! 356 config ALPHA_EB64P
554 bool "Svpbmt extension support for sup !! 357 bool
555 depends on 64BIT && MMU !! 358 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
556 depends on RISCV_ALTERNATIVE <<
557 default y 359 default y
558 help 360 help
559 Adds support to dynamically detect !! 361 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA,
560 ISA-extension (Supervisor-mode: pag !! 362 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
561 enable its usage. !! 363 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
>> 364 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
>> 365 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size.
>> 366 Runs from standard PC power supply.
562 367
563 The memory type for a page contains !! 368 config ALPHA_EV5
564 that indicate the cacheability, ide !! 369 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
565 properties for access to that page. !! 370 default y if ALPHA_RX164 || ALPHA_RAWHIDE || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_SABLE && ALPHA_GAMMA || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
566 371
567 The Svpbmt extension is only availa !! 372 config ALPHA_EV4
568 !! 373 bool
569 If you don't know what to do here, !! 374 default y if ALPHA_LYNX && !ALPHA_EV5
570 375
571 config TOOLCHAIN_HAS_V !! 376 config ALPHA_CIA
572 bool 377 bool
>> 378 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_NORITAKE && ALPHA_PRIMO || ALPHA_MIKASA && ALPHA_PRIMO || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR
573 default y 379 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 <<
578 380
579 config RISCV_ISA_V !! 381 config ALPHA_EV56
580 bool "VECTOR extension support" !! 382 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
581 depends on TOOLCHAIN_HAS_V !! 383 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
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. <<
588 384
589 If you don't know what to do here, s !! 385 config ALPHA_EV56
590 !! 386 prompt "EV56 CPU (speed >= 333MHz)?"
591 config RISCV_ISA_V_DEFAULT_ENABLE !! 387 depends on ALPHA_NORITAKE || ALPHA_PRIMO
592 bool "Enable userspace Vector by defau <<
593 depends on RISCV_ISA_V <<
594 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 <<
599 388
600 If you don't know what to do here, s !! 389 config ALPHA_EV56
>> 390 prompt "EV56 CPU (speed >= 400MHz)?"
>> 391 depends on ALPHA_RAWHIDE
601 392
602 config RISCV_ISA_V_UCOPY_THRESHOLD !! 393 config ALPHA_PRIMO
603 int "Threshold size for vectorized use !! 394 bool "EV5 CPU daughtercard (model 5/xxx)?"
604 depends on RISCV_ISA_V !! 395 depends on ALPHA_NORITAKE || ALPHA_MIKASA
605 default 768 <<
606 help 396 help
607 Prefer using vectorized copy_to_user !! 397 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
608 workload size exceeds this value. <<
609 398
610 config RISCV_ISA_V_PREEMPTIVE !! 399 config ALPHA_GAMMA
611 bool "Run kernel-mode Vector with kern !! 400 bool "EV5 CPU(s) (model 5/xxx)?"
612 depends on PREEMPTION !! 401 depends on ALPHA_SABLE
613 depends on RISCV_ISA_V <<
614 default y <<
615 help 402 help
616 Usually, in-kernel SIMD routines are !! 403 Say Y if you have an AS 2000 5/xxx or an AS 2100 5/xxx.
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 <<
623 404
624 config RISCV_ISA_ZAWRS !! 405 config ALPHA_GAMMA
625 bool "Zawrs extension support for more !! 406 bool
626 depends on RISCV_ALTERNATIVE !! 407 depends on ALPHA_LYNX
627 default y 408 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. <<
634 409
635 If you don't know what to do here, s !! 410 config ALPHA_T2
636 <<
637 config TOOLCHAIN_HAS_ZBB <<
638 bool 411 bool
>> 412 depends on ALPHA_SABLE || ALPHA_LYNX
639 default y 413 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 <<
651 414
652 config RISCV_ISA_ZBA !! 415 config ALPHA_PYXIS
653 bool "Zba extension support for bit ma !! 416 bool
>> 417 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
654 default y 418 default y
655 help <<
656 Add support for enabling optimisati <<
657 extension is detected at boot. <<
658 <<
659 The Zba extension provides instruct <<
660 of addresses that index into arrays <<
661 419
662 If you don't know what to do here, !! 420 config ALPHA_EV6
663 !! 421 bool
664 config RISCV_ISA_ZBB !! 422 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
665 bool "Zbb extension support for bit ma <<
666 depends on TOOLCHAIN_HAS_ZBB <<
667 depends on RISCV_ALTERNATIVE <<
668 default y 423 default y
669 help <<
670 Adds support to dynamically detect <<
671 extension (basic bit manipulation) <<
672 <<
673 The Zbb extension provides instruct <<
674 of bit-specific operations (count b <<
675 bitrotation, etc). <<
676 <<
677 If you don't know what to do here, <<
678 424
679 config TOOLCHAIN_HAS_ZBC !! 425 config ALPHA_TSUNAMI
680 bool 426 bool
>> 427 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
681 default y 428 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 <<
686 429
687 config RISCV_ISA_ZBC !! 430 config ALPHA_EV67
688 bool "Zbc extension support for carry- !! 431 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
689 depends on TOOLCHAIN_HAS_ZBC !! 432 default y if ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
690 depends on MMU <<
691 depends on RISCV_ALTERNATIVE <<
692 default y <<
693 help 433 help
694 Adds support to dynamically detect !! 434 Is this a machine based on the EV67 core? If in doubt, select N here
695 extension (carry-less multiplicatio !! 435 and the machine will be treated as an EV6.
696 <<
697 The Zbc extension could accelerate <<
698 calculations. <<
699 <<
700 If you don't know what to do here, <<
701 436
702 config RISCV_ISA_ZICBOM !! 437 config ALPHA_MCPCIA
703 bool "Zicbom extension support for non !! 438 bool
704 depends on MMU !! 439 depends on ALPHA_RAWHIDE
705 depends on RISCV_ALTERNATIVE <<
706 default y 440 default y
707 select RISCV_DMA_NONCOHERENT <<
708 select DMA_DIRECT_REMAP <<
709 help <<
710 Adds support to dynamically detect <<
711 extension (Cache Block Management O <<
712 usage. <<
713 <<
714 The Zicbom extension can be used to <<
715 non-coherent DMA support on devices <<
716 441
717 If you don't know what to do here, !! 442 config ALPHA_POLARIS
718 !! 443 bool
719 config RISCV_ISA_ZICBOZ !! 444 depends on ALPHA_RX164
720 bool "Zicboz extension support for fas <<
721 depends on RISCV_ALTERNATIVE <<
722 default y 445 default y
723 help <<
724 Enable the use of the Zicboz extens <<
725 when available. <<
726 <<
727 The Zicboz extension is used for fa <<
728 <<
729 If you don't know what to do here, <<
730 <<
731 config TOOLCHAIN_NEEDS_EXPLICIT_ZICSR_ZIFENCEI <<
732 def_bool y <<
733 # https://sourceware.org/git/?p=binuti <<
734 # https://gcc.gnu.org/git/?p=gcc.git;a <<
735 depends on AS_IS_GNU && AS_VERSION >= <<
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 <<
746 446
747 config TOOLCHAIN_NEEDS_OLD_ISA_SPEC !! 447 config ALPHA_IRONGATE
748 def_bool y !! 448 bool
749 depends on TOOLCHAIN_NEEDS_EXPLICIT_ZI !! 449 depends on ALPHA_NAUTILUS
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 <<
759 config FPU <<
760 bool "FPU support" <<
761 default y 450 default y
762 help <<
763 Say N here if you want to disable al <<
764 in the kernel. <<
765 451
766 If you don't know what to do here, s !! 452 config GENERIC_HWEIGHT
>> 453 bool
>> 454 default y if !ALPHA_EV67
767 455
768 config IRQ_STACKS !! 456 config ALPHA_AVANTI
769 bool "Independent irq & softirq stacks !! 457 bool
>> 458 depends on ALPHA_XL || ALPHA_AVANTI_CH
770 default y 459 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 <<
777 config THREAD_SIZE_ORDER <<
778 int "Kernel stack size (in power-of-tw <<
779 range 0 4 <<
780 default 1 if 32BIT <<
781 default 2 <<
782 help 460 help
783 Specify the Pages of thread stack si !! 461 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
784 affects irq stack size, which is equ !! 462 Alphas. Info at
>> 463 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
785 464
786 config RISCV_MISALIGNED !! 465 config ALPHA_BROKEN_IRQ_MASK
787 bool 466 bool
788 select SYSCTL_ARCH_UNALIGN_ALLOW !! 467 depends on ALPHA_GENERIC || ALPHA_PC164
789 help !! 468 default y
790 Embed support for emulating misalign <<
791 <<
792 choice <<
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 <<
841 endchoice <<
842 <<
843 source "arch/riscv/Kconfig.vendor" <<
844 <<
845 endmenu # "Platform type" <<
846 <<
847 menu "Kernel features" <<
848 <<
849 source "kernel/Kconfig.hz" <<
850 469
851 config RISCV_SBI_V01 !! 470 config VGA_HOSE
852 bool "SBI v0.1 support" !! 471 bool
853 depends on RISCV_SBI !! 472 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
>> 473 default y
854 help 474 help
855 This config allows kernel to use SBI !! 475 Support VGA on an arbitrary hose; needed for several platforms
856 deprecated in future once legacy M-m !! 476 which always have multiple hoses, and whose consoles support it.
857 477
858 config RISCV_BOOT_SPINWAIT <<
859 bool "Spinwait booting method" <<
860 depends on SMP <<
861 default y if RISCV_SBI_V01 || RISCV_M_ <<
862 help <<
863 This enables support for booting Lin <<
864 spinwait method, all cores randomly <<
865 gets chosen via lottery and all othe <<
866 variable. This method cannot support <<
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. <<
875 478
876 If unsure what to do here, say N. !! 479 config ALPHA_QEMU
>> 480 bool "Run under QEMU emulation"
>> 481 depends on !ALPHA_GENERIC
>> 482 ---help---
>> 483 Assume the presence of special features supported by QEMU PALcode
>> 484 that reduce the overhead of system emulation.
877 485
878 config ARCH_SUPPORTS_KEXEC !! 486 Generic kernels will auto-detect QEMU. But when building a
879 def_bool y !! 487 system-specific kernel, the assumption is that we want to
>> 488 eliminate as many runtime tests as possible.
880 489
881 config ARCH_SELECTS_KEXEC !! 490 If unsure, say N.
882 def_bool y <<
883 depends on KEXEC <<
884 select HOTPLUG_CPU if SMP <<
885 491
886 config ARCH_SUPPORTS_KEXEC_FILE <<
887 def_bool 64BIT <<
888 492
889 config ARCH_SELECTS_KEXEC_FILE !! 493 config ALPHA_SRM
890 def_bool y !! 494 bool "Use SRM as bootloader" if ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P || ALPHA_PC164 || ALPHA_TAKARA || ALPHA_EB164 || ALPHA_ALCOR || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_NAUTILUS || ALPHA_NONAME
891 depends on KEXEC_FILE !! 495 depends on TTY
892 select HAVE_IMA_KEXEC if IMA !! 496 default y if ALPHA_JENSEN || ALPHA_MIKASA || ALPHA_SABLE || ALPHA_LYNX || ALPHA_NORITAKE || ALPHA_DP264 || ALPHA_RAWHIDE || ALPHA_EIGER || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_MARVEL
893 select KEXEC_ELF !! 497 ---help---
>> 498 There are two different types of booting firmware on Alphas: SRM,
>> 499 which is command line driven, and ARC, which uses menus and arrow
>> 500 keys. Details about the Linux/Alpha booting process are contained in
>> 501 the Linux/Alpha FAQ, accessible on the WWW from
>> 502 <http://www.alphalinux.org/>.
>> 503
>> 504 The usual way to load Linux on an Alpha machine is to use MILO
>> 505 (a bootloader that lets you pass command line parameters to the
>> 506 kernel just like lilo does for the x86 architecture) which can be
>> 507 loaded either from ARC or can be installed directly as a permanent
>> 508 firmware replacement from floppy (which requires changing a certain
>> 509 jumper on the motherboard). If you want to do either of these, say N
>> 510 here. If MILO doesn't work on your system (true for Jensen
>> 511 motherboards), you can bypass it altogether and boot Linux directly
>> 512 from an SRM console; say Y here in order to do that. Note that you
>> 513 won't be able to boot from an IDE disk using SRM.
894 514
895 config ARCH_SUPPORTS_KEXEC_PURGATORY !! 515 If unsure, say N.
896 def_bool ARCH_SUPPORTS_KEXEC_FILE <<
897 516
898 config ARCH_SUPPORTS_CRASH_DUMP !! 517 config ARCH_MAY_HAVE_PC_FDC
899 def_bool y 518 def_bool y
900 519
901 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATIO !! 520 config SMP
902 def_bool CRASH_RESERVE !! 521 bool "Symmetric multi-processing support"
903 !! 522 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
904 config COMPAT !! 523 ---help---
905 bool "Kernel support for 32-bit U-mode !! 524 This enables support for systems with more than one CPU. If you have
906 default 64BIT !! 525 a system with only one CPU, say N. If you have a system with more
907 depends on 64BIT && MMU !! 526 than one CPU, say Y.
908 help !! 527
909 This option enables support for a 32 !! 528 If you say N here, the kernel will run on uni- and multiprocessor
910 kernel at S-mode. riscv32-specific c !! 529 machines, but will use only one CPU of a multiprocessor machine. If
911 the user helper functions (vdso), si !! 530 you say Y here, the kernel will run on many, but not all,
912 ptrace interface are handled appropr !! 531 uniprocessor machines. On a uniprocessor machine, the kernel
913 !! 532 will run faster if you say N here.
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 <<
967 If unsure, say N. <<
968 <<
969 endmenu # "Kernel features" <<
970 <<
971 menu "Boot options" <<
972 <<
973 config CMDLINE <<
974 string "Built-in kernel command line" <<
975 help <<
976 For most platforms, the arguments fo <<
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 <<
992 config CMDLINE_FALLBACK <<
993 bool "Use bootloader kernel arguments <<
994 help <<
995 Use the built-in command line as fal <<
996 during boot. This is the default beh <<
997 <<
998 config CMDLINE_EXTEND <<
999 bool "Extend bootloader kernel argumen <<
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 <<
1006 config CMDLINE_FORCE <<
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 533
1014 endchoice !! 534 See also the SMP-HOWTO available at
>> 535 <http://www.tldp.org/docs.html#howto>.
1015 536
1016 config EFI_STUB !! 537 If you don't know what to do here, say N.
1017 bool <<
1018 538
1019 config EFI !! 539 config NR_CPUS
1020 bool "UEFI runtime support" !! 540 int "Maximum number of CPUs (2-32)"
1021 depends on OF && !XIP_KERNEL !! 541 range 2 32
1022 depends on MMU !! 542 depends on SMP
1023 default y !! 543 default "32" if ALPHA_GENERIC || ALPHA_MARVEL
1024 select ARCH_SUPPORTS_ACPI if 64BIT !! 544 default "4" if !ALPHA_GENERIC && !ALPHA_MARVEL
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 545 help
1033 This option provides support for ru !! 546 MARVEL support can handle a maximum of 32 CPUs, all the others
1034 by UEFI firmware (such as non-volat !! 547 with working support have a maximum of 4 CPUs.
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 548
1039 config DMI !! 549 config ARCH_DISCONTIGMEM_ENABLE
1040 bool "Enable support for SMBIOS (DMI) !! 550 bool "Discontiguous Memory Support"
1041 depends on EFI <<
1042 default y <<
1043 help 551 help
1044 This enables SMBIOS/DMI feature for !! 552 Say Y to support efficient handling of discontiguous physical memory,
1045 !! 553 for architectures which are either NUMA (Non-Uniform Memory Access)
1046 This option is only useful on syste !! 554 or have huge holes in the physical address space for other reasons.
1047 However, even with this option, the !! 555 See <file:Documentation/vm/numa.rst> for more.
1048 continue to boot on existing non-UE <<
1049 556
1050 config CC_HAVE_STACKPROTECTOR_TLS !! 557 config NUMA
1051 def_bool $(cc-option,-mstack-protecto !! 558 bool "NUMA Support (EXPERIMENTAL)"
1052 !! 559 depends on DISCONTIGMEM && BROKEN
1053 config STACKPROTECTOR_PER_TASK !! 560 help
1054 def_bool y !! 561 Say Y to compile the kernel to support NUMA (Non-Uniform Memory
1055 depends on !RANDSTRUCT !! 562 Access). This option is for configuring high-end multiprocessor
1056 depends on STACKPROTECTOR && CC_HAVE_ !! 563 server machines. If in doubt, say N.
>> 564
>> 565 config ALPHA_WTINT
>> 566 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
>> 567 default y if ALPHA_QEMU
>> 568 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
>> 569 default n if !ALPHA_SRM && !ALPHA_GENERIC
>> 570 default y if SMP
>> 571 ---help---
>> 572 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
>> 573 to sleep until the next interrupt. This may reduce the power
>> 574 consumed, and the heat produced by the computer. However, it has
>> 575 the side effect of making the cycle counter unreliable as a timing
>> 576 device across the sleep.
1057 577
1058 config PHYS_RAM_BASE_FIXED !! 578 For emulation under QEMU, definitely say Y here, as we have other
1059 bool "Explicitly specified physical R !! 579 mechanisms for measuring time than the cycle counter.
1060 depends on NONPORTABLE <<
1061 default n <<
1062 580
1063 config PHYS_RAM_BASE !! 581 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
1064 hex "Platform Physical RAM address" !! 582 MILO, sleep mode is not supported so you might as well say N here.
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 583
1099 If unsure, say N. !! 584 For SMP systems we cannot use the cycle counter for timing anyway,
>> 585 so you might as well say Y here.
1100 586
1101 config XIP_PHYS_ADDR <<
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 <<
1110 config RISCV_ISA_FALLBACK <<
1111 bool "Permit falling back to parsing <<
1112 default y <<
1113 help <<
1114 Parsing the "riscv,isa" devicetree <<
1115 replaced by a list of explicitly de <<
1116 with existing platforms, the kernel <<
1117 "riscv,isa" property if the replace <<
1118 <<
1119 Selecting N here will result in a k <<
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 <<
1132 Build a device tree into the Linux <<
1133 This option should be selected if n <<
1134 If unsure, say N. 587 If unsure, say N.
1135 588
>> 589 config NODES_SHIFT
>> 590 int
>> 591 default "7"
>> 592 depends on NEED_MULTIPLE_NODES
1136 593
1137 config BUILTIN_DTB_SOURCE !! 594 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
1138 string "Built-in device tree source" !! 595 config ALPHA_LARGE_VMALLOC
1139 depends on BUILTIN_DTB <<
1140 help <<
1141 DTS file path (without suffix, rela <<
1142 for the DTS file that will be used <<
1143 kernel. <<
1144 <<
1145 endmenu # "Boot options" <<
1146 <<
1147 config PORTABLE <<
1148 bool 596 bool
1149 default !NONPORTABLE !! 597 ---help---
1150 select EFI !! 598 Process creation and other aspects of virtual memory management can
1151 select MMU !! 599 be streamlined if we restrict the kernel to one PGD for all vmalloc
1152 select OF !! 600 allocations. This equates to about 8GB.
1153 !! 601
1154 config ARCH_PROC_KCORE_TEXT !! 602 Under normal circumstances, this is so far and above what is needed
1155 def_bool y !! 603 as to be laughable. However, there are certain applications (such
1156 !! 604 as benchmark-grade in-kernel web serving) that can make use of as
1157 menu "Power management options" !! 605 much vmalloc space as is available.
1158 !! 606
1159 source "kernel/power/Kconfig" !! 607 Say N unless you know you need gobs and gobs of vmalloc space.
>> 608
>> 609 config VERBOSE_MCHECK
>> 610 bool "Verbose Machine Checks"
>> 611
>> 612 config VERBOSE_MCHECK_ON
>> 613 int "Verbose Printing Mode (0=off, 1=on, 2=all)"
>> 614 depends on VERBOSE_MCHECK
>> 615 default 1
>> 616 ---help---
>> 617 This option allows the default printing mode to be set, and then
>> 618 possibly overridden by a boot command argument.
>> 619
>> 620 For example, if one wanted the option of printing verbose
>> 621 machine checks, but wanted the default to be as if verbose
>> 622 machine check printing was turned off, then one would choose
>> 623 the printing mode to be 0. Then, upon reboot, one could add
>> 624 the boot command line "verbose_mcheck=1" to get the normal
>> 625 verbose machine check printing, or "verbose_mcheck=2" to get
>> 626 the maximum information available.
1160 627
1161 config ARCH_HIBERNATION_POSSIBLE !! 628 Take the default (1) unless you want more control or more info.
1162 def_bool y <<
1163 <<
1164 config ARCH_HIBERNATION_HEADER <<
1165 def_bool HIBERNATION <<
1166 <<
1167 config ARCH_SUSPEND_POSSIBLE <<
1168 def_bool y <<
1169 <<
1170 endmenu # "Power management options" <<
1171 <<
1172 menu "CPU Power Management" <<
1173 <<
1174 source "drivers/cpuidle/Kconfig" <<
1175 629
1176 source "drivers/cpufreq/Kconfig" !! 630 choice
1177 !! 631 prompt "Timer interrupt frequency (HZ)?"
1178 endmenu # "CPU Power Management" !! 632 default HZ_128 if ALPHA_QEMU
1179 !! 633 default HZ_1200 if ALPHA_RAWHIDE
1180 source "arch/riscv/kvm/Kconfig" !! 634 default HZ_1024
>> 635 ---help---
>> 636 The frequency at which timer interrupts occur. A high frequency
>> 637 minimizes latency, whereas a low frequency minimizes overhead of
>> 638 process accounting. The later effect is especially significant
>> 639 when being run under QEMU.
>> 640
>> 641 Note that some Alpha hardware cannot change the interrupt frequency
>> 642 of the timer. If unsure, say 1024 (or 1200 for Rawhide).
>> 643
>> 644 config HZ_32
>> 645 bool "32 Hz"
>> 646 config HZ_64
>> 647 bool "64 Hz"
>> 648 config HZ_128
>> 649 bool "128 Hz"
>> 650 config HZ_256
>> 651 bool "256 Hz"
>> 652 config HZ_1024
>> 653 bool "1024 Hz"
>> 654 config HZ_1200
>> 655 bool "1200 Hz"
>> 656 endchoice
1181 657
1182 source "drivers/acpi/Kconfig" !! 658 config HZ
>> 659 int
>> 660 default 32 if HZ_32
>> 661 default 64 if HZ_64
>> 662 default 128 if HZ_128
>> 663 default 256 if HZ_256
>> 664 default 1200 if HZ_1200
>> 665 default 1024
>> 666
>> 667 config SRM_ENV
>> 668 tristate "SRM environment through procfs"
>> 669 depends on PROC_FS
>> 670 ---help---
>> 671 If you enable this option, a subdirectory inside /proc called
>> 672 /proc/srm_environment will give you access to the all important
>> 673 SRM environment variables (those which have a name) and also
>> 674 to all others (by their internal number).
>> 675
>> 676 SRM is something like a BIOS for Alpha machines. There are some
>> 677 other such BIOSes, like AlphaBIOS, which this driver cannot
>> 678 support (hey, that's not SRM!).
>> 679
>> 680 Despite the fact that this driver doesn't work on all Alphas (but
>> 681 only on those which have SRM as their firmware), it's save to
>> 682 build it even if your particular machine doesn't know about SRM
>> 683 (or if you intend to compile a generic kernel). It will simply
>> 684 not create those subdirectory in /proc (and give you some warning,
>> 685 of course).
>> 686
>> 687 This driver is also available as a module and will be called
>> 688 srm_env then.
>> 689
>> 690 endmenu
>> 691
>> 692 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
>> 693 # but we also need it if VGA_HOSE is set
>> 694 config DUMMY_CONSOLE
>> 695 bool
>> 696 depends on VGA_HOSE
>> 697 default y
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