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_32BIT_USTAT_F_TINODE
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 6 select ARCH_HAS_CURRENT_STACK_POINTER
28 select ARCH_HAS_DEBUG_VIRTUAL if MMU !! 7 select ARCH_MIGHT_HAVE_PC_PARPORT
29 select ARCH_HAS_DEBUG_VM_PGTABLE !! 8 select ARCH_MIGHT_HAVE_PC_SERIO
30 select ARCH_HAS_DEBUG_WX !! 9 select ARCH_NO_PREEMPT
31 select ARCH_HAS_FAST_MULTIPLIER !! 10 select ARCH_NO_SG_CHAIN
32 select ARCH_HAS_FORTIFY_SOURCE !! 11 select ARCH_USE_CMPXCHG_LOCKREF
33 select ARCH_HAS_GCOV_PROFILE_ALL !! 12 select DMA_OPS if PCI
34 select ARCH_HAS_GIGANTIC_PAGE !! 13 select FORCE_PCI if !ALPHA_JENSEN
35 select ARCH_HAS_KCOV !! 14 select PCI_DOMAINS if PCI
36 select ARCH_HAS_KERNEL_FPU_SUPPORT if !! 15 select PCI_SYSCALL if PCI
37 select ARCH_HAS_MEMBARRIER_CALLBACKS !! 16 select HAVE_ASM_MODVERSIONS
38 select ARCH_HAS_MEMBARRIER_SYNC_CORE !! 17 select HAVE_PCSPKR_PLATFORM
39 select ARCH_HAS_MMIOWB !! 18 select HAVE_PERF_EVENTS
40 select ARCH_HAS_NON_OVERLAPPING_ADDRES !! 19 select NEED_DMA_MAP_STATE
41 select ARCH_HAS_PMEM_API !! 20 select NEED_SG_DMA_LENGTH
42 select ARCH_HAS_PREPARE_SYNC_CORE_CMD !! 21 select GENERIC_IRQ_PROBE
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 22 select GENERIC_PCI_IOMAP
111 select GENERIC_PTDUMP if MMU !! 23 select AUTO_IRQ_AFFINITY if SMP
112 select GENERIC_SCHED_CLOCK !! 24 select GENERIC_IRQ_SHOW
>> 25 select ARCH_WANT_IPC_PARSE_VERSION
>> 26 select ARCH_HAVE_NMI_SAFE_CMPXCHG
>> 27 select AUDIT_ARCH
>> 28 select GENERIC_CPU_VULNERABILITIES
113 select GENERIC_SMP_IDLE_THREAD 29 select GENERIC_SMP_IDLE_THREAD
114 select GENERIC_TIME_VSYSCALL if MMU && !! 30 select HAS_IOPORT
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 31 select HAVE_ARCH_AUDITSYSCALL
119 select HAVE_ARCH_HUGE_VMALLOC if HAVE_ !! 32 select HAVE_MOD_ARCH_SPECIFIC
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 33 select LOCK_MM_AND_FIND_VMA
190 select MMU_GATHER_RCU_TABLE_FREE if SM !! 34 select MODULES_USE_ELF_RELA
191 select MODULES_USE_ELF_RELA if MODULES !! 35 select ODD_RT_SIGACTION
192 select OF !! 36 select OLD_SIGSUSPEND
193 select OF_EARLY_FLATTREE !! 37 select CPU_NO_EFFICIENT_FFS if !ALPHA_EV67
194 select OF_IRQ !! 38 select MMU_GATHER_NO_RANGE
195 select PCI_DOMAINS_GENERIC if PCI !! 39 select SPARSEMEM_EXTREME if SPARSEMEM
196 select PCI_ECAM if (ACPI && PCI) !! 40 select ZONE_DMA
197 select PCI_MSI if PCI !! 41 help
198 select RISCV_ALTERNATIVE if !XIP_KERNE !! 42 The Alpha is a 64-bit general-purpose processor designed and
199 select RISCV_APLIC !! 43 marketed by the Digital Equipment Corporation of blessed memory,
200 select RISCV_IMSIC !! 44 now Hewlett-Packard. The Alpha Linux project has a home page at
201 select RISCV_INTC !! 45 <http://www.alphalinux.org/>.
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 46
233 config RISCV_USE_LINKER_RELAXATION !! 47 config 64BIT
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 48 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 49
278 config MMU 50 config MMU
279 bool "MMU-based Paged Memory Managemen !! 51 bool
280 default y 52 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 53
316 config GENERIC_BUG !! 54 config ARCH_HAS_ILOG2_U32
317 def_bool y !! 55 bool
318 depends on BUG !! 56 default n
319 select GENERIC_BUG_RELATIVE_POINTERS i <<
320 57
321 config GENERIC_BUG_RELATIVE_POINTERS !! 58 config ARCH_HAS_ILOG2_U64
322 bool 59 bool
>> 60 default n
323 61
324 config GENERIC_CALIBRATE_DELAY 62 config GENERIC_CALIBRATE_DELAY
325 def_bool y !! 63 bool
326 !! 64 default y
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 65
336 config ILLEGAL_POINTER_VALUE !! 66 config GENERIC_ISA_DMA
337 hex !! 67 bool
338 default 0 if 32BIT !! 68 default y
339 default 0xdead000000000000 if 64BIT <<
340 69
341 config PGTABLE_LEVELS 70 config PGTABLE_LEVELS
342 int 71 int
343 default 5 if 64BIT !! 72 default 3
344 default 2 <<
345 <<
346 config LOCKDEP_SUPPORT <<
347 def_bool y <<
348 73
349 config RISCV_DMA_NONCOHERENT !! 74 config AUDIT_ARCH
350 bool 75 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 <<
363 config AS_HAS_INSN <<
364 def_bool $(as-instr,.insn r 51$(comma) <<
365 <<
366 config AS_HAS_OPTION_ARCH <<
367 # https://github.com/llvm/llvm-project <<
368 def_bool y <<
369 depends on $(as-instr, .option arch$(c <<
370 76
371 source "arch/riscv/Kconfig.socs" !! 77 menu "System setup"
372 source "arch/riscv/Kconfig.errata" <<
373 78
374 menu "Platform type" !! 79 choice
375 !! 80 prompt "Alpha system type"
376 config NONPORTABLE !! 81 default ALPHA_GENERIC
377 bool "Allow configurations that result <<
378 help 82 help
379 RISC-V kernel binaries are compatibl !! 83 This is the system type of your hardware. A "generic" kernel will
380 whenever possible, but there are som !! 84 run on any supported Alpha system. However, if you configure a
381 satisfied by configurations that res !! 85 kernel for your specific system, it will be faster and smaller.
382 not portable between systems. !! 86
383 !! 87 To find out what type of Alpha system you have, you may want to
384 Selecting N does not guarantee kerne !! 88 check out the Linux/Alpha FAQ, accessible on the WWW from
385 systems. Selecting any of the optio !! 89 <http://www.alphalinux.org/>. In summary:
386 result in kernel binaries that are u !! 90
>> 91 Alcor/Alpha-XLT AS 600, AS 500, XL-300, XL-366
>> 92 Alpha-XL XL-233, XL-266
>> 93 AlphaBook1 Alpha laptop
>> 94 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, AS 400
>> 95 Cabriolet AlphaPC64, AlphaPCI64
>> 96 DP264 DP264 / DS20 / ES40 / DS10 / DS10L
>> 97 EB164 EB164 21164 evaluation board
>> 98 EB64+ EB64+ 21064 evaluation board
>> 99 EB66 EB66 21066 evaluation board
>> 100 EB66+ EB66+ 21066 evaluation board
>> 101 Jensen DECpc 150, DEC 2000 models 300, 500
>> 102 LX164 AlphaPC164-LX
>> 103 Lynx AS 2100A
>> 104 Miata Personal Workstation 433/500/600 a/au
>> 105 Marvel AlphaServer ES47 / ES80 / GS1280
>> 106 Mikasa AS 1000
>> 107 Noname AXPpci33, UDB (Multia)
>> 108 Noritake AS 1000A, AS 600A, AS 800
>> 109 PC164 AlphaPC164
>> 110 Rawhide AS 1200, AS 4000, AS 4100
>> 111 Ruffian RPX164-2, AlphaPC164-UX, AlphaPC164-BX
>> 112 SX164 AlphaPC164-SX
>> 113 Sable AS 2000, AS 2100
>> 114 Shark DS 20L
>> 115 Takara Takara (OEM)
>> 116 Titan AlphaServer ES45 / DS25 / DS15
>> 117 Wildfire AlphaServer GS 40/80/160/320
>> 118
>> 119 If you don't know what to do, choose "generic".
>> 120
>> 121 config ALPHA_GENERIC
>> 122 bool "Generic"
>> 123 depends on TTY
>> 124 select HAVE_EISA
>> 125 help
>> 126 A generic kernel will run on all supported Alpha hardware.
>> 127
>> 128 config ALPHA_ALCOR
>> 129 bool "Alcor/Alpha-XLT"
>> 130 select HAVE_EISA
>> 131 help
>> 132 For systems using the Digital ALCOR chipset: 5 chips (4, 64-bit data
>> 133 slices (Data Switch, DSW) - 208-pin PQFP and 1 control (Control, I/O
>> 134 Address, CIA) - a 383 pin plastic PGA). It provides a DRAM
>> 135 controller (256-bit memory bus) and a PCI interface. It also does
>> 136 all the work required to support an external Bcache and to maintain
>> 137 memory coherence when a PCI device DMAs into (or out of) memory.
>> 138
>> 139 config ALPHA_XL
>> 140 bool "Alpha-XL"
>> 141 help
>> 142 XL-233 and XL-266-based Alpha systems.
>> 143
>> 144 config ALPHA_BOOK1
>> 145 bool "AlphaBook1"
>> 146 help
>> 147 Dec AlphaBook1/Burns Alpha-based laptops.
>> 148
>> 149 config ALPHA_AVANTI_CH
>> 150 bool "Avanti"
>> 151
>> 152 config ALPHA_CABRIOLET
>> 153 bool "Cabriolet"
>> 154 help
>> 155 Cabriolet AlphaPC64, AlphaPCI64 systems. Derived from EB64+ but now
>> 156 baby-AT with Flash boot ROM, no on-board SCSI or Ethernet. 3 ISA
>> 157 slots, 4 PCI slots (one pair are on a shared slot), uses plug-in
>> 158 Bcache SIMMs. Requires power supply with 3.3V output.
>> 159
>> 160 config ALPHA_DP264
>> 161 bool "DP264"
>> 162 help
>> 163 Various 21264 systems with the tsunami core logic chipset.
>> 164 API Networks: 264DP, UP2000(+), CS20;
>> 165 Compaq: DS10(E,L), XP900, XP1000, DS20(E), ES40.
>> 166
>> 167 config ALPHA_EB164
>> 168 bool "EB164"
>> 169 help
>> 170 EB164 21164 evaluation board from DEC. Uses 21164 and ALCOR. Has
>> 171 ISA and PCI expansion (3 ISA slots, 2 64-bit PCI slots (one is
>> 172 shared with an ISA slot) and 2 32-bit PCI slots. Uses plus-in
>> 173 Bcache SIMMs. I/O sub-system provides SuperI/O (2S, 1P, FD), KBD,
>> 174 MOUSE (PS2 style), RTC/NVRAM. Boot ROM is Flash. PC-AT-sized
>> 175 motherboard. Requires power supply with 3.3V output.
>> 176
>> 177 config ALPHA_EB64P_CH
>> 178 bool "EB64+"
>> 179
>> 180 config ALPHA_EB66
>> 181 bool "EB66"
>> 182 help
>> 183 A Digital DS group board. Uses 21066 or 21066A. I/O sub-system is
>> 184 identical to EB64+. Baby PC-AT size. Runs from standard PC power
>> 185 supply. The EB66 schematic was published as a marketing poster
>> 186 advertising the 21066 as "the first microprocessor in the world with
>> 187 embedded PCI".
>> 188
>> 189 config ALPHA_EB66P
>> 190 bool "EB66+"
>> 191 help
>> 192 Later variant of the EB66 board.
>> 193
>> 194 config ALPHA_EIGER
>> 195 bool "Eiger"
>> 196 help
>> 197 Apparently an obscure OEM single-board computer based on the
>> 198 Typhoon/Tsunami chipset family. Information on it is scanty.
>> 199
>> 200 config ALPHA_JENSEN
>> 201 bool "Jensen"
>> 202 select HAVE_EISA
>> 203 help
>> 204 DEC PC 150 AXP (aka Jensen): This is a very old Digital system - one
>> 205 of the first-generation Alpha systems. A number of these systems
>> 206 seem to be available on the second- hand market. The Jensen is a
>> 207 floor-standing tower system which originally used a 150MHz 21064 It
>> 208 used programmable logic to interface a 486 EISA I/O bridge to the
>> 209 CPU.
>> 210
>> 211 config ALPHA_LX164
>> 212 bool "LX164"
>> 213 help
>> 214 A technical overview of this board is available at
>> 215 <http://www.unix-ag.org/Linux-Alpha/Architectures/LX164.html>.
>> 216
>> 217 config ALPHA_LYNX
>> 218 bool "Lynx"
>> 219 select HAVE_EISA
>> 220 help
>> 221 AlphaServer 2100A-based systems.
>> 222
>> 223 config ALPHA_MARVEL
>> 224 bool "Marvel"
>> 225 help
>> 226 AlphaServer ES47 / ES80 / GS1280 based on EV7.
>> 227
>> 228 config ALPHA_MIATA
>> 229 bool "Miata"
>> 230 select HAVE_EISA
>> 231 help
>> 232 The Digital PersonalWorkStation (PWS 433a, 433au, 500a, 500au, 600a,
>> 233 or 600au).
>> 234
>> 235 config ALPHA_MIKASA
>> 236 bool "Mikasa"
>> 237 help
>> 238 AlphaServer 1000-based Alpha systems.
>> 239
>> 240 config ALPHA_NAUTILUS
>> 241 bool "Nautilus"
>> 242 help
>> 243 Alpha systems based on the AMD 751 & ALI 1543C chipsets.
>> 244
>> 245 config ALPHA_NONAME_CH
>> 246 bool "Noname"
>> 247
>> 248 config ALPHA_NORITAKE
>> 249 bool "Noritake"
>> 250 select HAVE_EISA
>> 251 help
>> 252 AlphaServer 1000A, AlphaServer 600A, and AlphaServer 800-based
387 systems. 253 systems.
388 254
389 If unsure, say N. !! 255 config ALPHA_PC164
>> 256 bool "PC164"
390 257
391 choice !! 258 config ALPHA_P2K
392 prompt "Base ISA" !! 259 bool "Platform2000"
393 default ARCH_RV64I <<
394 help <<
395 This selects the base ISA that this <<
396 the target platform. <<
397 260
398 config ARCH_RV32I !! 261 config ALPHA_RAWHIDE
399 bool "RV32I" !! 262 bool "Rawhide"
400 depends on NONPORTABLE !! 263 select HAVE_EISA
401 select 32BIT !! 264 help
402 select GENERIC_LIB_ASHLDI3 !! 265 AlphaServer 1200, AlphaServer 4000 and AlphaServer 4100 machines.
403 select GENERIC_LIB_ASHRDI3 !! 266 See HOWTO at
404 select GENERIC_LIB_LSHRDI3 !! 267 <http://www.alphalinux.org/docs/rawhide/4100_install.shtml>.
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 <<
412 268
413 endchoice !! 269 config ALPHA_RUFFIAN
>> 270 bool "Ruffian"
>> 271 help
>> 272 Samsung APC164UX. There is a page on known problems and workarounds
>> 273 at <http://www.alphalinux.org/faq/FAQ-11.html>.
414 274
415 # We must be able to map all physical memory i !! 275 config ALPHA_RX164
416 # is still a bit more efficient when generatin !! 276 bool "RX164"
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 <<
428 277
429 config MODULE_SECTIONS !! 278 config ALPHA_SX164
430 bool !! 279 bool "SX164"
431 select HAVE_MOD_ARCH_SPECIFIC <<
432 280
433 config SMP !! 281 config ALPHA_SABLE
434 bool "Symmetric Multi-Processing" !! 282 bool "Sable"
>> 283 select HAVE_EISA
435 help 284 help
436 This enables support for systems wit !! 285 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. <<
443 286
444 If you don't know what to do here, s !! 287 config ALPHA_SHARK
>> 288 bool "Shark"
445 289
446 config SCHED_MC !! 290 config ALPHA_TAKARA
447 bool "Multi-core scheduler support" !! 291 bool "Takara"
448 depends on SMP <<
449 help 292 help
450 Multi-core scheduler support improve !! 293 Alpha 11164-based OEM single-board computer.
451 making when dealing with multi-core <<
452 increased overhead in some places. I <<
453 <<
454 config NR_CPUS <<
455 int "Maximum number of CPUs (2-512)" <<
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 <<
462 294
463 config HOTPLUG_CPU !! 295 config ALPHA_TITAN
464 bool "Support for hot-pluggable CPUs" !! 296 bool "Titan"
465 depends on SMP <<
466 select GENERIC_IRQ_MIGRATION <<
467 help 297 help
>> 298 AlphaServer ES45/DS25 SMP based on EV68 and Titan chipset.
468 299
469 Say Y here to experiment with turnin !! 300 config ALPHA_WILDFIRE
470 can be controlled through /sys/devic !! 301 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 302 help
495 Enable NUMA (Non-Uniform Memory Acce !! 303 AlphaServer GS 40/80/160/320 SMP based on the EV67 core.
496 304
497 The kernel will try to allocate memo !! 305 endchoice
498 local memory of the CPU and add some <<
499 <<
500 config NODES_SHIFT <<
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 <<
508 306
509 config RISCV_ALTERNATIVE !! 307 # clear all implied options (don't want default values for those):
>> 308 # Most of these machines have ISA slots; not exactly sure which don't,
>> 309 # and this doesn't activate hordes of code, so do it always.
>> 310 config ISA
510 bool 311 bool
511 depends on !XIP_KERNEL !! 312 default y
512 help 313 help
513 This Kconfig allows the kernel to au !! 314 Find out whether you have ISA slots on your motherboard. ISA is the
514 erratum or cpufeature required by th !! 315 name of a bus system, i.e. the way the CPU talks to the other stuff
515 time. The code patching overhead is !! 316 inside your box. Other bus systems are PCI, EISA, MicroChannel
516 once at boot and once on each module !! 317 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
>> 318 newer boards don't support it. If you have ISA, say Y, otherwise N.
517 319
518 config RISCV_ALTERNATIVE_EARLY !! 320 config ISA_DMA_API
519 bool 321 bool
520 depends on RISCV_ALTERNATIVE !! 322 default y
521 help <<
522 Allows early patching of the kernel <<
523 323
524 config RISCV_ISA_C !! 324 config ALPHA_NONAME
525 bool "Emit compressed instructions whe !! 325 bool
>> 326 depends on ALPHA_BOOK1 || ALPHA_NONAME_CH
526 default y 327 default y
527 help 328 help
528 Adds "C" to the ISA subsets that the !! 329 The AXPpci33 (aka NoName), is based on the EB66 (includes the Multia
529 when building Linux, which results i !! 330 UDB). This design was produced by Digital's Technical OEM (TOEM)
530 Linux binary. !! 331 group. It uses the 21066 processor running at 166MHz or 233MHz. It
>> 332 is a baby-AT size, and runs from a standard PC power supply. It has
>> 333 5 ISA slots and 3 PCI slots (one pair are a shared slot). There are
>> 334 2 versions, with either PS/2 or large DIN connectors for the
>> 335 keyboard.
531 336
532 If you don't know what to do here, s !! 337 config ALPHA_EV4
>> 338 bool
>> 339 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
>> 340 default y if !ALPHA_LYNX
533 341
534 config RISCV_ISA_SVNAPOT !! 342 config ALPHA_LCA
535 bool "Svnapot extension support for su !! 343 bool
536 depends on 64BIT && MMU !! 344 depends on ALPHA_NONAME || ALPHA_EB66 || ALPHA_EB66P || ALPHA_P2K
537 depends on RISCV_ALTERNATIVE <<
538 default y 345 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 <<
550 346
551 If you don't know what to do here, s !! 347 config ALPHA_APECS
>> 348 bool
>> 349 depends on !ALPHA_PRIMO && (ALPHA_NORITAKE || ALPHA_MIKASA) || ALPHA_CABRIOLET || ALPHA_AVANTI_CH || ALPHA_EB64P_CH || ALPHA_XL
>> 350 default y
552 351
553 config RISCV_ISA_SVPBMT !! 352 config ALPHA_EB64P
554 bool "Svpbmt extension support for sup !! 353 bool
555 depends on 64BIT && MMU !! 354 depends on ALPHA_CABRIOLET || ALPHA_EB64P_CH
556 depends on RISCV_ALTERNATIVE <<
557 default y 355 default y
558 help 356 help
559 Adds support to dynamically detect !! 357 Uses 21064 or 21064A and APECs. Has ISA and PCI expansion (3 ISA,
560 ISA-extension (Supervisor-mode: pag !! 358 2 PCI, one pair are on a shared slot). Supports 36-bit DRAM SIMs.
561 enable its usage. !! 359 ISA bus generated by Intel SaturnI/O PCI-ISA bridge. On-board SCSI
562 !! 360 (NCR 810 on PCI) Ethernet (Digital 21040), KBD, MOUSE (PS2 style),
563 The memory type for a page contains !! 361 SuperI/O (2S, 1P, FD), RTC/NVRAM. Boot ROM is EPROM. PC-AT size.
564 that indicate the cacheability, ide !! 362 Runs from standard PC power supply.
565 properties for access to that page. <<
566 363
567 The Svpbmt extension is only availa !! 364 config ALPHA_EV5
>> 365 bool "EV5 CPU(s) (model 5/xxx)?" if ALPHA_LYNX
>> 366 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
568 367
569 If you don't know what to do here, !! 368 config ALPHA_EV4
570 <<
571 config TOOLCHAIN_HAS_V <<
572 bool 369 bool
573 default y !! 370 default y if ALPHA_LYNX && !ALPHA_EV5
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 <<
578 371
579 config RISCV_ISA_V !! 372 config ALPHA_CIA
580 bool "VECTOR extension support" !! 373 bool
581 depends on TOOLCHAIN_HAS_V !! 374 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
582 depends on FPU <<
583 select DYNAMIC_SIGFRAME <<
584 default y 375 default y
585 help <<
586 Say N here if you want to disable al <<
587 in the kernel. <<
588 376
589 If you don't know what to do here, s !! 377 config ALPHA_EV56
>> 378 bool "EV56 CPU (speed >= 366MHz)?" if ALPHA_ALCOR
>> 379 default y if ALPHA_RX164 || ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN || ALPHA_PC164 || ALPHA_TAKARA
590 380
591 config RISCV_ISA_V_DEFAULT_ENABLE !! 381 config ALPHA_EV56
592 bool "Enable userspace Vector by defau !! 382 prompt "EV56 CPU (speed >= 333MHz)?"
593 depends on RISCV_ISA_V !! 383 depends on ALPHA_NORITAKE || ALPHA_PRIMO
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 <<
599 384
600 If you don't know what to do here, s !! 385 config ALPHA_EV56
>> 386 prompt "EV56 CPU (speed >= 400MHz)?"
>> 387 depends on ALPHA_RAWHIDE
601 388
602 config RISCV_ISA_V_UCOPY_THRESHOLD !! 389 config ALPHA_PRIMO
603 int "Threshold size for vectorized use !! 390 bool "EV5 CPU daughtercard (model 5/xxx)?"
604 depends on RISCV_ISA_V !! 391 depends on ALPHA_NORITAKE || ALPHA_MIKASA
605 default 768 <<
606 help 392 help
607 Prefer using vectorized copy_to_user !! 393 Say Y if you have an AS 1000 5/xxx or an AS 1000A 5/xxx.
608 workload size exceeds this value. <<
609 394
610 config RISCV_ISA_V_PREEMPTIVE !! 395 config ALPHA_GAMMA
611 bool "Run kernel-mode Vector with kern !! 396 bool "EV5 CPU(s) (model 5/xxx)?"
612 depends on PREEMPTION !! 397 depends on ALPHA_SABLE
613 depends on RISCV_ISA_V <<
614 default y <<
615 help 398 help
616 Usually, in-kernel SIMD routines are !! 399 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 <<
619 400
620 This config allows kernel to run SIM !! 401 config ALPHA_GAMMA
621 preemption. Enabling this config wil !! 402 bool
622 consumption due to the allocation of !! 403 depends on ALPHA_LYNX
623 <<
624 config RISCV_ISA_ZAWRS <<
625 bool "Zawrs extension support for more <<
626 depends on RISCV_ALTERNATIVE <<
627 default y 404 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. <<
634 405
635 If you don't know what to do here, s !! 406 config ALPHA_T2
636 <<
637 config TOOLCHAIN_HAS_ZBB <<
638 bool 407 bool
>> 408 depends on ALPHA_SABLE || ALPHA_LYNX
639 default y 409 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 <<
651 410
652 config RISCV_ISA_ZBA !! 411 config ALPHA_PYXIS
653 bool "Zba extension support for bit ma !! 412 bool
>> 413 depends on ALPHA_MIATA || ALPHA_LX164 || ALPHA_SX164 || ALPHA_RUFFIAN
654 default y 414 default y
655 help <<
656 Add support for enabling optimisati <<
657 extension is detected at boot. <<
658 415
659 The Zba extension provides instruct !! 416 config ALPHA_EV6
660 of addresses that index into arrays !! 417 bool
661 !! 418 depends on ALPHA_NAUTILUS || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER || ALPHA_MARVEL
662 If you don't know what to do here, <<
663 <<
664 config RISCV_ISA_ZBB <<
665 bool "Zbb extension support for bit ma <<
666 depends on TOOLCHAIN_HAS_ZBB <<
667 depends on RISCV_ALTERNATIVE <<
668 default y 419 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, <<
678 420
679 config TOOLCHAIN_HAS_ZBC !! 421 config ALPHA_TSUNAMI
680 bool 422 bool
>> 423 depends on ALPHA_SHARK || ALPHA_DP264 || ALPHA_EIGER
681 default y 424 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 <<
686 425
687 config RISCV_ISA_ZBC !! 426 config ALPHA_EV67
688 bool "Zbc extension support for carry- !! 427 bool "EV67 (or later) CPU (speed > 600MHz)?" if ALPHA_DP264 || ALPHA_EIGER
689 depends on TOOLCHAIN_HAS_ZBC !! 428 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 429 help
694 Adds support to dynamically detect !! 430 Is this a machine based on the EV67 core? If in doubt, select N here
695 extension (carry-less multiplicatio !! 431 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, <<
701 432
702 config RISCV_ISA_ZICBOM !! 433 config ALPHA_MCPCIA
703 bool "Zicbom extension support for non !! 434 bool
704 depends on MMU !! 435 depends on ALPHA_RAWHIDE
705 depends on RISCV_ALTERNATIVE <<
706 default y 436 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 <<
717 If you don't know what to do here, <<
718 437
719 config RISCV_ISA_ZICBOZ !! 438 config ALPHA_POLARIS
720 bool "Zicboz extension support for fas !! 439 bool
721 depends on RISCV_ALTERNATIVE !! 440 depends on ALPHA_RX164
722 default y 441 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 <<
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 <<
758 442
759 config FPU !! 443 config ALPHA_IRONGATE
760 bool "FPU support" !! 444 bool
>> 445 depends on ALPHA_NAUTILUS
761 default y 446 default y
762 help <<
763 Say N here if you want to disable al <<
764 in the kernel. <<
765 447
766 If you don't know what to do here, s !! 448 config GENERIC_HWEIGHT
>> 449 bool
>> 450 default y if !ALPHA_EV67
767 451
768 config IRQ_STACKS !! 452 config ALPHA_AVANTI
769 bool "Independent irq & softirq stacks !! 453 bool
>> 454 depends on ALPHA_XL || ALPHA_AVANTI_CH
770 default y 455 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 456 help
783 Specify the Pages of thread stack si !! 457 Avanti AS 200, AS 205, AS 250, AS 255, AS 300, and AS 400-based
784 affects irq stack size, which is equ !! 458 Alphas. Info at
>> 459 <http://www.unix-ag.org/Linux-Alpha/Architectures/Avanti.html>.
785 460
786 config RISCV_MISALIGNED !! 461 config ALPHA_BROKEN_IRQ_MASK
787 bool 462 bool
788 select SYSCTL_ARCH_UNALIGN_ALLOW !! 463 depends on ALPHA_GENERIC || ALPHA_PC164
789 help !! 464 default y
790 Embed support for emulating misalign <<
791 465
792 choice !! 466 config VGA_HOSE
793 prompt "Unaligned Accesses Support" !! 467 bool
794 default RISCV_PROBE_UNALIGNED_ACCESS !! 468 depends on VGA_CONSOLE && (ALPHA_GENERIC || ALPHA_TITAN || ALPHA_MARVEL || ALPHA_TSUNAMI)
>> 469 default y
795 help 470 help
796 This determines the level of support !! 471 Support VGA on an arbitrary hose; needed for several platforms
797 information is used by the kernel to !! 472 which always have multiple hoses, and whose consoles support it.
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 <<
840 473
841 endchoice <<
842 474
843 source "arch/riscv/Kconfig.vendor" !! 475 config ALPHA_QEMU
844 !! 476 bool "Run under QEMU emulation"
845 endmenu # "Platform type" !! 477 depends on !ALPHA_GENERIC
846 <<
847 menu "Kernel features" <<
848 <<
849 source "kernel/Kconfig.hz" <<
850 <<
851 config RISCV_SBI_V01 <<
852 bool "SBI v0.1 support" <<
853 depends on RISCV_SBI <<
854 help <<
855 This config allows kernel to use SBI <<
856 deprecated in future once legacy M-m <<
857 <<
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 478 help
863 This enables support for booting Lin !! 479 Assume the presence of special features supported by QEMU PALcode
864 spinwait method, all cores randomly !! 480 that reduce the overhead of system emulation.
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. <<
875 481
876 If unsure what to do here, say N. !! 482 Generic kernels will auto-detect QEMU. But when building a
>> 483 system-specific kernel, the assumption is that we want to
>> 484 eliminate as many runtime tests as possible.
877 485
878 config ARCH_SUPPORTS_KEXEC !! 486 If unsure, say N.
879 def_bool y <<
880 <<
881 config ARCH_SELECTS_KEXEC <<
882 def_bool y <<
883 depends on KEXEC <<
884 select HOTPLUG_CPU if SMP <<
885 487
886 config ARCH_SUPPORTS_KEXEC_FILE <<
887 def_bool 64BIT <<
888 488
889 config ARCH_SELECTS_KEXEC_FILE !! 489 config ALPHA_SRM
890 def_bool y !! 490 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 !! 491 depends on TTY
892 select HAVE_IMA_KEXEC if IMA !! 492 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 !! 493 help
>> 494 There are two different types of booting firmware on Alphas: SRM,
>> 495 which is command line driven, and ARC, which uses menus and arrow
>> 496 keys. Details about the Linux/Alpha booting process are contained in
>> 497 the Linux/Alpha FAQ, accessible on the WWW from
>> 498 <http://www.alphalinux.org/>.
>> 499
>> 500 The usual way to load Linux on an Alpha machine is to use MILO
>> 501 (a bootloader that lets you pass command line parameters to the
>> 502 kernel just like lilo does for the x86 architecture) which can be
>> 503 loaded either from ARC or can be installed directly as a permanent
>> 504 firmware replacement from floppy (which requires changing a certain
>> 505 jumper on the motherboard). If you want to do either of these, say N
>> 506 here. If MILO doesn't work on your system (true for Jensen
>> 507 motherboards), you can bypass it altogether and boot Linux directly
>> 508 from an SRM console; say Y here in order to do that. Note that you
>> 509 won't be able to boot from an IDE disk using SRM.
894 510
895 config ARCH_SUPPORTS_KEXEC_PURGATORY !! 511 If unsure, say N.
896 def_bool ARCH_SUPPORTS_KEXEC_FILE <<
897 512
898 config ARCH_SUPPORTS_CRASH_DUMP !! 513 config ARCH_MAY_HAVE_PC_FDC
899 def_bool y 514 def_bool y
900 515
901 config ARCH_HAS_GENERIC_CRASHKERNEL_RESERVATIO !! 516 config SMP
902 def_bool CRASH_RESERVE !! 517 bool "Symmetric multi-processing support"
903 !! 518 depends on ALPHA_SABLE || ALPHA_LYNX || ALPHA_RAWHIDE || ALPHA_DP264 || ALPHA_WILDFIRE || ALPHA_TITAN || ALPHA_GENERIC || ALPHA_SHARK || ALPHA_MARVEL
904 config COMPAT !! 519 help
905 bool "Kernel support for 32-bit U-mode !! 520 This enables support for systems with more than one CPU. If you have
906 default 64BIT !! 521 a system with only one CPU, say N. If you have a system with more
907 depends on 64BIT && MMU !! 522 than one CPU, say Y.
908 help !! 523
909 This option enables support for a 32 !! 524 If you say N here, the kernel will run on uni- and multiprocessor
910 kernel at S-mode. riscv32-specific c !! 525 machines, but will use only one CPU of a multiprocessor machine. If
911 the user helper functions (vdso), si !! 526 you say Y here, the kernel will run on many, but not all,
912 ptrace interface are handled appropr !! 527 uniprocessor machines. On a uniprocessor machine, the kernel
913 !! 528 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 529
1014 endchoice !! 530 See also the SMP-HOWTO available at
>> 531 <https://www.tldp.org/docs.html#howto>.
1015 532
1016 config EFI_STUB !! 533 If you don't know what to do here, say N.
1017 bool <<
1018 534
1019 config EFI !! 535 config NR_CPUS
1020 bool "UEFI runtime support" !! 536 int "Maximum number of CPUs (2-32)"
1021 depends on OF && !XIP_KERNEL !! 537 range 2 32
1022 depends on MMU !! 538 depends on SMP
1023 default y !! 539 default "32" if ALPHA_GENERIC || ALPHA_MARVEL
1024 select ARCH_SUPPORTS_ACPI if 64BIT !! 540 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 541 help
1033 This option provides support for ru !! 542 MARVEL support can handle a maximum of 32 CPUs, all the others
1034 by UEFI firmware (such as non-volat !! 543 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 544
1039 config DMI !! 545 config ARCH_SPARSEMEM_ENABLE
1040 bool "Enable support for SMBIOS (DMI) !! 546 bool "Sparse Memory Support"
1041 depends on EFI <<
1042 default y <<
1043 help 547 help
1044 This enables SMBIOS/DMI feature for !! 548 Say Y to support efficient handling of discontiguous physical memory,
1045 !! 549 for systems that have huge holes in the physical address space.
1046 This option is only useful on syste <<
1047 However, even with this option, the <<
1048 continue to boot on existing non-UE <<
1049 550
1050 config CC_HAVE_STACKPROTECTOR_TLS !! 551 config ALPHA_WTINT
1051 def_bool $(cc-option,-mstack-protecto !! 552 bool "Use WTINT" if ALPHA_SRM || ALPHA_GENERIC
>> 553 default y if ALPHA_QEMU
>> 554 default n if ALPHA_EV5 || ALPHA_EV56 || (ALPHA_EV4 && !ALPHA_LCA)
>> 555 default n if !ALPHA_SRM && !ALPHA_GENERIC
>> 556 default y if SMP
>> 557 help
>> 558 The Wait for Interrupt (WTINT) PALcall attempts to place the CPU
>> 559 to sleep until the next interrupt. This may reduce the power
>> 560 consumed, and the heat produced by the computer. However, it has
>> 561 the side effect of making the cycle counter unreliable as a timing
>> 562 device across the sleep.
1052 563
1053 config STACKPROTECTOR_PER_TASK !! 564 For emulation under QEMU, definitely say Y here, as we have other
1054 def_bool y !! 565 mechanisms for measuring time than the cycle counter.
1055 depends on !RANDSTRUCT <<
1056 depends on STACKPROTECTOR && CC_HAVE_ <<
1057 566
1058 config PHYS_RAM_BASE_FIXED !! 567 For EV4 (but not LCA), EV5 and EV56 systems, or for systems running
1059 bool "Explicitly specified physical R !! 568 MILO, sleep mode is not supported so you might as well say N here.
1060 depends on NONPORTABLE <<
1061 default n <<
1062 569
1063 config PHYS_RAM_BASE !! 570 For SMP systems we cannot use the cycle counter for timing anyway,
1064 hex "Platform Physical RAM address" !! 571 so you might as well say Y 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 572
1099 If unsure, say N. 573 If unsure, say N.
1100 574
1101 config XIP_PHYS_ADDR !! 575 # LARGE_VMALLOC is racy, if you *really* need it then fix it first
1102 hex "XIP Kernel Physical Location" !! 576 config ALPHA_LARGE_VMALLOC
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. <<
1135 <<
1136 <<
1137 config BUILTIN_DTB_SOURCE <<
1138 string "Built-in device tree source" <<
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 577 bool
1149 default !NONPORTABLE !! 578 help
1150 select EFI !! 579 Process creation and other aspects of virtual memory management can
1151 select MMU !! 580 be streamlined if we restrict the kernel to one PGD for all vmalloc
1152 select OF !! 581 allocations. This equates to about 8GB.
1153 <<
1154 config ARCH_PROC_KCORE_TEXT <<
1155 def_bool y <<
1156 <<
1157 menu "Power management options" <<
1158 <<
1159 source "kernel/power/Kconfig" <<
1160 <<
1161 config ARCH_HIBERNATION_POSSIBLE <<
1162 def_bool y <<
1163 <<
1164 config ARCH_HIBERNATION_HEADER <<
1165 def_bool HIBERNATION <<
1166 582
1167 config ARCH_SUSPEND_POSSIBLE !! 583 Under normal circumstances, this is so far and above what is needed
1168 def_bool y !! 584 as to be laughable. However, there are certain applications (such
>> 585 as benchmark-grade in-kernel web serving) that can make use of as
>> 586 much vmalloc space as is available.
1169 587
1170 endmenu # "Power management options" !! 588 Say N unless you know you need gobs and gobs of vmalloc space.
1171 589
1172 menu "CPU Power Management" !! 590 config VERBOSE_MCHECK
>> 591 bool "Verbose Machine Checks"
1173 592
1174 source "drivers/cpuidle/Kconfig" !! 593 config VERBOSE_MCHECK_ON
>> 594 int "Verbose Printing Mode (0=off, 1=on, 2=all)"
>> 595 depends on VERBOSE_MCHECK
>> 596 default 1
>> 597 help
>> 598 This option allows the default printing mode to be set, and then
>> 599 possibly overridden by a boot command argument.
1175 600
1176 source "drivers/cpufreq/Kconfig" !! 601 For example, if one wanted the option of printing verbose
>> 602 machine checks, but wanted the default to be as if verbose
>> 603 machine check printing was turned off, then one would choose
>> 604 the printing mode to be 0. Then, upon reboot, one could add
>> 605 the boot command line "verbose_mcheck=1" to get the normal
>> 606 verbose machine check printing, or "verbose_mcheck=2" to get
>> 607 the maximum information available.
1177 608
1178 endmenu # "CPU Power Management" !! 609 Take the default (1) unless you want more control or more info.
1179 610
1180 source "arch/riscv/kvm/Kconfig" !! 611 choice
>> 612 prompt "Timer interrupt frequency (HZ)?"
>> 613 default HZ_128 if ALPHA_QEMU
>> 614 default HZ_1200 if ALPHA_RAWHIDE
>> 615 default HZ_1024
>> 616 help
>> 617 The frequency at which timer interrupts occur. A high frequency
>> 618 minimizes latency, whereas a low frequency minimizes overhead of
>> 619 process accounting. The later effect is especially significant
>> 620 when being run under QEMU.
>> 621
>> 622 Note that some Alpha hardware cannot change the interrupt frequency
>> 623 of the timer. If unsure, say 1024 (or 1200 for Rawhide).
>> 624
>> 625 config HZ_32
>> 626 bool "32 Hz"
>> 627 config HZ_64
>> 628 bool "64 Hz"
>> 629 config HZ_128
>> 630 bool "128 Hz"
>> 631 config HZ_256
>> 632 bool "256 Hz"
>> 633 config HZ_1024
>> 634 bool "1024 Hz"
>> 635 config HZ_1200
>> 636 bool "1200 Hz"
>> 637 endchoice
1181 638
1182 source "drivers/acpi/Kconfig" !! 639 config HZ
>> 640 int
>> 641 default 32 if HZ_32
>> 642 default 64 if HZ_64
>> 643 default 128 if HZ_128
>> 644 default 256 if HZ_256
>> 645 default 1200 if HZ_1200
>> 646 default 1024
>> 647
>> 648 config SRM_ENV
>> 649 tristate "SRM environment through procfs"
>> 650 depends on PROC_FS
>> 651 help
>> 652 If you enable this option, a subdirectory inside /proc called
>> 653 /proc/srm_environment will give you access to the all important
>> 654 SRM environment variables (those which have a name) and also
>> 655 to all others (by their internal number).
>> 656
>> 657 SRM is something like a BIOS for Alpha machines. There are some
>> 658 other such BIOSes, like AlphaBIOS, which this driver cannot
>> 659 support (hey, that's not SRM!).
>> 660
>> 661 Despite the fact that this driver doesn't work on all Alphas (but
>> 662 only on those which have SRM as their firmware), it's save to
>> 663 build it even if your particular machine doesn't know about SRM
>> 664 (or if you intend to compile a generic kernel). It will simply
>> 665 not create those subdirectory in /proc (and give you some warning,
>> 666 of course).
>> 667
>> 668 This driver is also available as a module and will be called
>> 669 srm_env then.
>> 670
>> 671 endmenu
>> 672
>> 673 # DUMMY_CONSOLE may be defined in drivers/video/console/Kconfig
>> 674 # but we also need it if VGA_HOSE is set
>> 675 config DUMMY_CONSOLE
>> 676 bool
>> 677 depends on VGA_HOSE
>> 678 default y
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