Kconfig (12284B)
1# SPDX-License-Identifier: GPL-2.0 2config LOONGARCH 3 bool 4 default y 5 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 6 select ARCH_BINFMT_ELF_STATE 7 select ARCH_ENABLE_MEMORY_HOTPLUG 8 select ARCH_ENABLE_MEMORY_HOTREMOVE 9 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 10 select ARCH_HAS_PHYS_TO_DMA 11 select ARCH_HAS_PTE_SPECIAL 12 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 13 select ARCH_INLINE_READ_LOCK if !PREEMPTION 14 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 15 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 16 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 17 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 18 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 19 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 20 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 21 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 22 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 23 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 24 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 25 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 26 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 27 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 28 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 29 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 30 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 31 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 32 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 33 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 34 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 35 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 36 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 37 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 38 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 39 select ARCH_MIGHT_HAVE_PC_PARPORT 40 select ARCH_MIGHT_HAVE_PC_SERIO 41 select ARCH_SPARSEMEM_ENABLE 42 select ARCH_SUPPORTS_ACPI 43 select ARCH_SUPPORTS_ATOMIC_RMW 44 select ARCH_SUPPORTS_HUGETLBFS 45 select ARCH_SUPPORTS_NUMA_BALANCING 46 select ARCH_USE_BUILTIN_BSWAP 47 select ARCH_USE_CMPXCHG_LOCKREF 48 select ARCH_USE_QUEUED_RWLOCKS 49 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 50 select ARCH_WANTS_NO_INSTR 51 select BUILDTIME_TABLE_SORT 52 select COMMON_CLK 53 select GENERIC_CLOCKEVENTS 54 select GENERIC_CMOS_UPDATE 55 select GENERIC_CPU_AUTOPROBE 56 select GENERIC_ENTRY 57 select GENERIC_GETTIMEOFDAY 58 select GENERIC_IRQ_MULTI_HANDLER 59 select GENERIC_IRQ_PROBE 60 select GENERIC_IRQ_SHOW 61 select GENERIC_LIB_ASHLDI3 62 select GENERIC_LIB_ASHRDI3 63 select GENERIC_LIB_CMPDI2 64 select GENERIC_LIB_LSHRDI3 65 select GENERIC_LIB_UCMPDI2 66 select GENERIC_PCI_IOMAP 67 select GENERIC_SCHED_CLOCK 68 select GENERIC_SMP_IDLE_THREAD 69 select GENERIC_TIME_VSYSCALL 70 select GPIOLIB 71 select HAVE_ARCH_AUDITSYSCALL 72 select HAVE_ARCH_COMPILER_H 73 select HAVE_ARCH_MMAP_RND_BITS if MMU 74 select HAVE_ARCH_SECCOMP_FILTER 75 select HAVE_ARCH_TRACEHOOK 76 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 77 select HAVE_ASM_MODVERSIONS 78 select HAVE_CONTEXT_TRACKING 79 select HAVE_DEBUG_STACKOVERFLOW 80 select HAVE_DMA_CONTIGUOUS 81 select HAVE_EXIT_THREAD 82 select HAVE_FAST_GUP 83 select HAVE_GENERIC_VDSO 84 select HAVE_IOREMAP_PROT 85 select HAVE_IRQ_EXIT_ON_IRQ_STACK 86 select HAVE_IRQ_TIME_ACCOUNTING 87 select HAVE_MOD_ARCH_SPECIFIC 88 select HAVE_NMI 89 select HAVE_PERF_EVENTS 90 select HAVE_REGS_AND_STACK_ACCESS_API 91 select HAVE_RSEQ 92 select HAVE_SETUP_PER_CPU_AREA if NUMA 93 select HAVE_SYSCALL_TRACEPOINTS 94 select HAVE_TIF_NOHZ 95 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 96 select IRQ_FORCED_THREADING 97 select IRQ_LOONGARCH_CPU 98 select MODULES_USE_ELF_RELA if MODULES 99 select NEED_PER_CPU_EMBED_FIRST_CHUNK 100 select NEED_PER_CPU_PAGE_FIRST_CHUNK 101 select OF 102 select OF_EARLY_FLATTREE 103 select PERF_USE_VMALLOC 104 select RTC_LIB 105 select SPARSE_IRQ 106 select SYSCTL_EXCEPTION_TRACE 107 select SWIOTLB 108 select TRACE_IRQFLAGS_SUPPORT 109 select USE_PERCPU_NUMA_NODE_ID 110 select ZONE_DMA32 111 112config 32BIT 113 bool 114 115config 64BIT 116 def_bool y 117 118config CPU_HAS_FPU 119 bool 120 default y 121 122config CPU_HAS_PREFETCH 123 bool 124 default y 125 126config GENERIC_CALIBRATE_DELAY 127 def_bool y 128 129config GENERIC_CSUM 130 def_bool y 131 132config GENERIC_HWEIGHT 133 def_bool y 134 135config L1_CACHE_SHIFT 136 int 137 default "6" 138 139config LOCKDEP_SUPPORT 140 bool 141 default y 142 143# MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the 144# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 145# are shared between architectures, and specifically expecting the symbols. 146config MACH_LOONGSON32 147 def_bool 32BIT 148 149config MACH_LOONGSON64 150 def_bool 64BIT 151 152config PAGE_SIZE_4KB 153 bool 154 155config PAGE_SIZE_16KB 156 bool 157 158config PAGE_SIZE_64KB 159 bool 160 161config PGTABLE_2LEVEL 162 bool 163 164config PGTABLE_3LEVEL 165 bool 166 167config PGTABLE_4LEVEL 168 bool 169 170config PGTABLE_LEVELS 171 int 172 default 2 if PGTABLE_2LEVEL 173 default 3 if PGTABLE_3LEVEL 174 default 4 if PGTABLE_4LEVEL 175 176config SCHED_OMIT_FRAME_POINTER 177 bool 178 default y 179 180menu "Kernel type and options" 181 182source "kernel/Kconfig.hz" 183 184choice 185 prompt "Page Table Layout" 186 default 16KB_2LEVEL if 32BIT 187 default 16KB_3LEVEL if 64BIT 188 help 189 Allows choosing the page table layout, which is a combination 190 of page size and page table levels. The size of virtual memory 191 address space are determined by the page table layout. 192 193config 4KB_3LEVEL 194 bool "4KB with 3 levels" 195 select PAGE_SIZE_4KB 196 select PGTABLE_3LEVEL 197 help 198 This option selects 4KB page size with 3 level page tables, which 199 support a maximum of 39 bits of application virtual memory. 200 201config 4KB_4LEVEL 202 bool "4KB with 4 levels" 203 select PAGE_SIZE_4KB 204 select PGTABLE_4LEVEL 205 help 206 This option selects 4KB page size with 4 level page tables, which 207 support a maximum of 48 bits of application virtual memory. 208 209config 16KB_2LEVEL 210 bool "16KB with 2 levels" 211 select PAGE_SIZE_16KB 212 select PGTABLE_2LEVEL 213 help 214 This option selects 16KB page size with 2 level page tables, which 215 support a maximum of 36 bits of application virtual memory. 216 217config 16KB_3LEVEL 218 bool "16KB with 3 levels" 219 select PAGE_SIZE_16KB 220 select PGTABLE_3LEVEL 221 help 222 This option selects 16KB page size with 3 level page tables, which 223 support a maximum of 47 bits of application virtual memory. 224 225config 64KB_2LEVEL 226 bool "64KB with 2 levels" 227 select PAGE_SIZE_64KB 228 select PGTABLE_2LEVEL 229 help 230 This option selects 64KB page size with 2 level page tables, which 231 support a maximum of 42 bits of application virtual memory. 232 233config 64KB_3LEVEL 234 bool "64KB with 3 levels" 235 select PAGE_SIZE_64KB 236 select PGTABLE_3LEVEL 237 help 238 This option selects 64KB page size with 3 level page tables, which 239 support a maximum of 55 bits of application virtual memory. 240 241endchoice 242 243config CMDLINE 244 string "Built-in kernel command line" 245 help 246 For most platforms, the arguments for the kernel's command line 247 are provided at run-time, during boot. However, there are cases 248 where either no arguments are being provided or the provided 249 arguments are insufficient or even invalid. 250 251 When that occurs, it is possible to define a built-in command 252 line here and choose how the kernel should use it later on. 253 254choice 255 prompt "Kernel command line type" 256 default CMDLINE_BOOTLOADER 257 help 258 Choose how the kernel will handle the provided built-in command 259 line. 260 261config CMDLINE_BOOTLOADER 262 bool "Use bootloader kernel arguments if available" 263 help 264 Prefer the command-line passed by the boot loader if available. 265 Use the built-in command line as fallback in case we get nothing 266 during boot. This is the default behaviour. 267 268config CMDLINE_EXTEND 269 bool "Use built-in to extend bootloader kernel arguments" 270 help 271 The command-line arguments provided during boot will be 272 appended to the built-in command line. This is useful in 273 cases where the provided arguments are insufficient and 274 you don't want to or cannot modify them. 275 276config CMDLINE_FORCE 277 bool "Always use the built-in kernel command string" 278 help 279 Always use the built-in command line, even if we get one during 280 boot. This is useful in case you need to override the provided 281 command line on systems where you don't have or want control 282 over it. 283 284endchoice 285 286config DMI 287 bool "Enable DMI scanning" 288 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 289 default y 290 help 291 This enables SMBIOS/DMI feature for systems, and scanning of 292 DMI to identify machine quirks. 293 294config EFI 295 bool "EFI runtime service support" 296 select UCS2_STRING 297 select EFI_PARAMS_FROM_FDT 298 select EFI_RUNTIME_WRAPPERS 299 help 300 This enables the kernel to use EFI runtime services that are 301 available (such as the EFI variable services). 302 303config SMP 304 bool "Multi-Processing support" 305 help 306 This enables support for systems with more than one CPU. If you have 307 a system with only one CPU, say N. If you have a system with more 308 than one CPU, say Y. 309 310 If you say N here, the kernel will run on uni- and multiprocessor 311 machines, but will use only one CPU of a multiprocessor machine. If 312 you say Y here, the kernel will run on many, but not all, 313 uniprocessor machines. On a uniprocessor machine, the kernel 314 will run faster if you say N here. 315 316 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 317 318 If you don't know what to do here, say N. 319 320config HOTPLUG_CPU 321 bool "Support for hot-pluggable CPUs" 322 depends on SMP 323 select GENERIC_IRQ_MIGRATION 324 help 325 Say Y here to allow turning CPUs off and on. CPUs can be 326 controlled through /sys/devices/system/cpu. 327 (Note: power management support will enable this option 328 automatically on SMP systems. ) 329 Say N if you want to disable CPU hotplug. 330 331config NR_CPUS 332 int "Maximum number of CPUs (2-256)" 333 range 2 256 334 depends on SMP 335 default "64" 336 help 337 This allows you to specify the maximum number of CPUs which this 338 kernel will support. 339 340config NUMA 341 bool "NUMA Support" 342 select SMP 343 select ACPI_NUMA if ACPI 344 help 345 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 346 support. This option improves performance on systems with more 347 than one NUMA node; on single node systems it is generally better 348 to leave it disabled. 349 350config NODES_SHIFT 351 int 352 default "6" 353 depends on NUMA 354 355config FORCE_MAX_ZONEORDER 356 int "Maximum zone order" 357 range 14 64 if PAGE_SIZE_64KB 358 default "14" if PAGE_SIZE_64KB 359 range 12 64 if PAGE_SIZE_16KB 360 default "12" if PAGE_SIZE_16KB 361 range 11 64 362 default "11" 363 help 364 The kernel memory allocator divides physically contiguous memory 365 blocks into "zones", where each zone is a power of two number of 366 pages. This option selects the largest power of two that the kernel 367 keeps in the memory allocator. If you need to allocate very large 368 blocks of physically contiguous memory, then you may need to 369 increase this value. 370 371 This config option is actually maximum order plus one. For example, 372 a value of 11 means that the largest free memory block is 2^10 pages. 373 374 The page size is not necessarily 4KB. Keep this in mind 375 when choosing a value for this option. 376 377config SECCOMP 378 bool "Enable seccomp to safely compute untrusted bytecode" 379 depends on PROC_FS 380 default y 381 help 382 This kernel feature is useful for number crunching applications 383 that may need to compute untrusted bytecode during their 384 execution. By using pipes or other transports made available to 385 the process as file descriptors supporting the read/write 386 syscalls, it's possible to isolate those applications in 387 their own address space using seccomp. Once seccomp is 388 enabled via /proc/<pid>/seccomp, it cannot be disabled 389 and the task is only allowed to execute a few safe syscalls 390 defined by each seccomp mode. 391 392 If unsure, say Y. Only embedded should say N here. 393 394endmenu 395 396config ARCH_SELECT_MEMORY_MODEL 397 def_bool y 398 399config ARCH_FLATMEM_ENABLE 400 def_bool y 401 depends on !NUMA 402 403config ARCH_SPARSEMEM_ENABLE 404 def_bool y 405 help 406 Say Y to support efficient handling of sparse physical memory, 407 for architectures which are either NUMA (Non-Uniform Memory Access) 408 or have huge holes in the physical address space for other reasons. 409 See <file:Documentation/vm/numa.rst> for more. 410 411config ARCH_ENABLE_THP_MIGRATION 412 def_bool y 413 depends on TRANSPARENT_HUGEPAGE 414 415config ARCH_MEMORY_PROBE 416 def_bool y 417 depends on MEMORY_HOTPLUG 418 419config MMU 420 bool 421 default y 422 423config ARCH_MMAP_RND_BITS_MIN 424 default 12 425 426config ARCH_MMAP_RND_BITS_MAX 427 default 18 428 429menu "Power management options" 430 431source "drivers/acpi/Kconfig" 432 433endmenu 434 435source "drivers/firmware/Kconfig"