1# SPDX-License-Identifier: GPL-2.0 2config LOONGARCH 3 bool 4 default y 5 select ACPI 6 select ACPI_GENERIC_GSI if ACPI 7 select ACPI_MCFG if ACPI 8 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI 9 select ARCH_BINFMT_ELF_STATE 10 select ARCH_ENABLE_MEMORY_HOTPLUG 11 select ARCH_ENABLE_MEMORY_HOTREMOVE 12 select ARCH_HAS_ACPI_TABLE_UPGRADE if ACPI 13 select ARCH_HAS_PHYS_TO_DMA 14 select ARCH_HAS_PTE_SPECIAL 15 select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST 16 select ARCH_INLINE_READ_LOCK if !PREEMPTION 17 select ARCH_INLINE_READ_LOCK_BH if !PREEMPTION 18 select ARCH_INLINE_READ_LOCK_IRQ if !PREEMPTION 19 select ARCH_INLINE_READ_LOCK_IRQSAVE if !PREEMPTION 20 select ARCH_INLINE_READ_UNLOCK if !PREEMPTION 21 select ARCH_INLINE_READ_UNLOCK_BH if !PREEMPTION 22 select ARCH_INLINE_READ_UNLOCK_IRQ if !PREEMPTION 23 select ARCH_INLINE_READ_UNLOCK_IRQRESTORE if !PREEMPTION 24 select ARCH_INLINE_WRITE_LOCK if !PREEMPTION 25 select ARCH_INLINE_WRITE_LOCK_BH if !PREEMPTION 26 select ARCH_INLINE_WRITE_LOCK_IRQ if !PREEMPTION 27 select ARCH_INLINE_WRITE_LOCK_IRQSAVE if !PREEMPTION 28 select ARCH_INLINE_WRITE_UNLOCK if !PREEMPTION 29 select ARCH_INLINE_WRITE_UNLOCK_BH if !PREEMPTION 30 select ARCH_INLINE_WRITE_UNLOCK_IRQ if !PREEMPTION 31 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE if !PREEMPTION 32 select ARCH_INLINE_SPIN_TRYLOCK if !PREEMPTION 33 select ARCH_INLINE_SPIN_TRYLOCK_BH if !PREEMPTION 34 select ARCH_INLINE_SPIN_LOCK if !PREEMPTION 35 select ARCH_INLINE_SPIN_LOCK_BH if !PREEMPTION 36 select ARCH_INLINE_SPIN_LOCK_IRQ if !PREEMPTION 37 select ARCH_INLINE_SPIN_LOCK_IRQSAVE if !PREEMPTION 38 select ARCH_INLINE_SPIN_UNLOCK if !PREEMPTION 39 select ARCH_INLINE_SPIN_UNLOCK_BH if !PREEMPTION 40 select ARCH_INLINE_SPIN_UNLOCK_IRQ if !PREEMPTION 41 select ARCH_INLINE_SPIN_UNLOCK_IRQRESTORE if !PREEMPTION 42 select ARCH_KEEP_MEMBLOCK 43 select ARCH_MIGHT_HAVE_PC_PARPORT 44 select ARCH_MIGHT_HAVE_PC_SERIO 45 select ARCH_SPARSEMEM_ENABLE 46 select ARCH_STACKWALK 47 select ARCH_SUPPORTS_ACPI 48 select ARCH_SUPPORTS_ATOMIC_RMW 49 select ARCH_SUPPORTS_HUGETLBFS 50 select ARCH_SUPPORTS_NUMA_BALANCING 51 select ARCH_USE_BUILTIN_BSWAP 52 select ARCH_USE_CMPXCHG_LOCKREF 53 select ARCH_USE_QUEUED_RWLOCKS 54 select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT 55 select ARCH_WANT_LD_ORPHAN_WARN 56 select ARCH_WANTS_NO_INSTR 57 select BUILDTIME_TABLE_SORT 58 select COMMON_CLK 59 select EFI 60 select GENERIC_CLOCKEVENTS 61 select GENERIC_CMOS_UPDATE 62 select GENERIC_CPU_AUTOPROBE 63 select GENERIC_ENTRY 64 select GENERIC_GETTIMEOFDAY 65 select GENERIC_IRQ_MULTI_HANDLER 66 select GENERIC_IRQ_PROBE 67 select GENERIC_IRQ_SHOW 68 select GENERIC_LIB_ASHLDI3 69 select GENERIC_LIB_ASHRDI3 70 select GENERIC_LIB_CMPDI2 71 select GENERIC_LIB_LSHRDI3 72 select GENERIC_LIB_UCMPDI2 73 select GENERIC_PCI_IOMAP 74 select GENERIC_SCHED_CLOCK 75 select GENERIC_SMP_IDLE_THREAD 76 select GENERIC_TIME_VSYSCALL 77 select GPIOLIB 78 select HAVE_ARCH_AUDITSYSCALL 79 select HAVE_ARCH_MMAP_RND_BITS if MMU 80 select HAVE_ARCH_SECCOMP_FILTER 81 select HAVE_ARCH_TRACEHOOK 82 select HAVE_ARCH_TRANSPARENT_HUGEPAGE 83 select HAVE_ASM_MODVERSIONS 84 select HAVE_CONTEXT_TRACKING_USER 85 select HAVE_DEBUG_STACKOVERFLOW 86 select HAVE_DMA_CONTIGUOUS 87 select HAVE_EXIT_THREAD 88 select HAVE_FAST_GUP 89 select HAVE_GENERIC_VDSO 90 select HAVE_IOREMAP_PROT 91 select HAVE_IRQ_EXIT_ON_IRQ_STACK 92 select HAVE_IRQ_TIME_ACCOUNTING 93 select HAVE_MOD_ARCH_SPECIFIC 94 select HAVE_NMI 95 select HAVE_PCI 96 select HAVE_PERF_EVENTS 97 select HAVE_REGS_AND_STACK_ACCESS_API 98 select HAVE_RSEQ 99 select HAVE_SETUP_PER_CPU_AREA if NUMA 100 select HAVE_SYSCALL_TRACEPOINTS 101 select HAVE_TIF_NOHZ 102 select HAVE_VIRT_CPU_ACCOUNTING_GEN if !SMP 103 select IRQ_FORCED_THREADING 104 select IRQ_LOONGARCH_CPU 105 select MMU_GATHER_MERGE_VMAS if MMU 106 select MODULES_USE_ELF_RELA if MODULES 107 select NEED_PER_CPU_EMBED_FIRST_CHUNK 108 select NEED_PER_CPU_PAGE_FIRST_CHUNK 109 select OF 110 select OF_EARLY_FLATTREE 111 select PCI 112 select PCI_DOMAINS_GENERIC 113 select PCI_ECAM if ACPI 114 select PCI_LOONGSON 115 select PCI_MSI_ARCH_FALLBACKS 116 select PCI_QUIRKS 117 select PERF_USE_VMALLOC 118 select RTC_LIB 119 select SMP 120 select SPARSE_IRQ 121 select SYSCTL_EXCEPTION_TRACE 122 select SWIOTLB 123 select TRACE_IRQFLAGS_SUPPORT 124 select USE_PERCPU_NUMA_NODE_ID 125 select USER_STACKTRACE_SUPPORT 126 select ZONE_DMA32 127 128config 32BIT 129 bool 130 131config 64BIT 132 def_bool y 133 134config CPU_HAS_FPU 135 bool 136 default y 137 138config CPU_HAS_PREFETCH 139 bool 140 default y 141 142config GENERIC_CALIBRATE_DELAY 143 def_bool y 144 145config GENERIC_CSUM 146 def_bool y 147 148config GENERIC_HWEIGHT 149 def_bool y 150 151config L1_CACHE_SHIFT 152 int 153 default "6" 154 155config LOCKDEP_SUPPORT 156 bool 157 default y 158 159config STACKTRACE_SUPPORT 160 bool 161 default y 162 163# MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the 164# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 165# are shared between architectures, and specifically expecting the symbols. 166config MACH_LOONGSON32 167 def_bool 32BIT 168 169config MACH_LOONGSON64 170 def_bool 64BIT 171 172config PAGE_SIZE_4KB 173 bool 174 175config PAGE_SIZE_16KB 176 bool 177 178config PAGE_SIZE_64KB 179 bool 180 181config PGTABLE_2LEVEL 182 bool 183 184config PGTABLE_3LEVEL 185 bool 186 187config PGTABLE_4LEVEL 188 bool 189 190config PGTABLE_LEVELS 191 int 192 default 2 if PGTABLE_2LEVEL 193 default 3 if PGTABLE_3LEVEL 194 default 4 if PGTABLE_4LEVEL 195 196config SCHED_OMIT_FRAME_POINTER 197 bool 198 default y 199 200menu "Kernel type and options" 201 202source "kernel/Kconfig.hz" 203 204choice 205 prompt "Page Table Layout" 206 default 16KB_2LEVEL if 32BIT 207 default 16KB_3LEVEL if 64BIT 208 help 209 Allows choosing the page table layout, which is a combination 210 of page size and page table levels. The size of virtual memory 211 address space are determined by the page table layout. 212 213config 4KB_3LEVEL 214 bool "4KB with 3 levels" 215 select PAGE_SIZE_4KB 216 select PGTABLE_3LEVEL 217 help 218 This option selects 4KB page size with 3 level page tables, which 219 support a maximum of 39 bits of application virtual memory. 220 221config 4KB_4LEVEL 222 bool "4KB with 4 levels" 223 select PAGE_SIZE_4KB 224 select PGTABLE_4LEVEL 225 help 226 This option selects 4KB page size with 4 level page tables, which 227 support a maximum of 48 bits of application virtual memory. 228 229config 16KB_2LEVEL 230 bool "16KB with 2 levels" 231 select PAGE_SIZE_16KB 232 select PGTABLE_2LEVEL 233 help 234 This option selects 16KB page size with 2 level page tables, which 235 support a maximum of 36 bits of application virtual memory. 236 237config 16KB_3LEVEL 238 bool "16KB with 3 levels" 239 select PAGE_SIZE_16KB 240 select PGTABLE_3LEVEL 241 help 242 This option selects 16KB page size with 3 level page tables, which 243 support a maximum of 47 bits of application virtual memory. 244 245config 64KB_2LEVEL 246 bool "64KB with 2 levels" 247 select PAGE_SIZE_64KB 248 select PGTABLE_2LEVEL 249 help 250 This option selects 64KB page size with 2 level page tables, which 251 support a maximum of 42 bits of application virtual memory. 252 253config 64KB_3LEVEL 254 bool "64KB with 3 levels" 255 select PAGE_SIZE_64KB 256 select PGTABLE_3LEVEL 257 help 258 This option selects 64KB page size with 3 level page tables, which 259 support a maximum of 55 bits of application virtual memory. 260 261endchoice 262 263config CMDLINE 264 string "Built-in kernel command line" 265 help 266 For most platforms, the arguments for the kernel's command line 267 are provided at run-time, during boot. However, there are cases 268 where either no arguments are being provided or the provided 269 arguments are insufficient or even invalid. 270 271 When that occurs, it is possible to define a built-in command 272 line here and choose how the kernel should use it later on. 273 274choice 275 prompt "Kernel command line type" 276 default CMDLINE_BOOTLOADER 277 help 278 Choose how the kernel will handle the provided built-in command 279 line. 280 281config CMDLINE_BOOTLOADER 282 bool "Use bootloader kernel arguments if available" 283 help 284 Prefer the command-line passed by the boot loader if available. 285 Use the built-in command line as fallback in case we get nothing 286 during boot. This is the default behaviour. 287 288config CMDLINE_EXTEND 289 bool "Use built-in to extend bootloader kernel arguments" 290 help 291 The command-line arguments provided during boot will be 292 appended to the built-in command line. This is useful in 293 cases where the provided arguments are insufficient and 294 you don't want to or cannot modify them. 295 296config CMDLINE_FORCE 297 bool "Always use the built-in kernel command string" 298 help 299 Always use the built-in command line, even if we get one during 300 boot. This is useful in case you need to override the provided 301 command line on systems where you don't have or want control 302 over it. 303 304endchoice 305 306config DMI 307 bool "Enable DMI scanning" 308 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 309 default y 310 help 311 This enables SMBIOS/DMI feature for systems, and scanning of 312 DMI to identify machine quirks. 313 314config EFI 315 bool "EFI runtime service support" 316 select UCS2_STRING 317 select EFI_PARAMS_FROM_FDT 318 select EFI_RUNTIME_WRAPPERS 319 help 320 This enables the kernel to use EFI runtime services that are 321 available (such as the EFI variable services). 322 323config SMP 324 bool "Multi-Processing support" 325 help 326 This enables support for systems with more than one CPU. If you have 327 a system with only one CPU, say N. If you have a system with more 328 than one CPU, say Y. 329 330 If you say N here, the kernel will run on uni- and multiprocessor 331 machines, but will use only one CPU of a multiprocessor machine. If 332 you say Y here, the kernel will run on many, but not all, 333 uniprocessor machines. On a uniprocessor machine, the kernel 334 will run faster if you say N here. 335 336 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 337 338 If you don't know what to do here, say N. 339 340config HOTPLUG_CPU 341 bool "Support for hot-pluggable CPUs" 342 depends on SMP 343 select GENERIC_IRQ_MIGRATION 344 help 345 Say Y here to allow turning CPUs off and on. CPUs can be 346 controlled through /sys/devices/system/cpu. 347 (Note: power management support will enable this option 348 automatically on SMP systems. ) 349 Say N if you want to disable CPU hotplug. 350 351config NR_CPUS 352 int "Maximum number of CPUs (2-256)" 353 range 2 256 354 depends on SMP 355 default "64" 356 help 357 This allows you to specify the maximum number of CPUs which this 358 kernel will support. 359 360config NUMA 361 bool "NUMA Support" 362 select SMP 363 select ACPI_NUMA if ACPI 364 help 365 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 366 support. This option improves performance on systems with more 367 than one NUMA node; on single node systems it is generally better 368 to leave it disabled. 369 370config NODES_SHIFT 371 int 372 default "6" 373 depends on NUMA 374 375config FORCE_MAX_ZONEORDER 376 int "Maximum zone order" 377 range 14 64 if PAGE_SIZE_64KB 378 default "14" if PAGE_SIZE_64KB 379 range 12 64 if PAGE_SIZE_16KB 380 default "12" if PAGE_SIZE_16KB 381 range 11 64 382 default "11" 383 help 384 The kernel memory allocator divides physically contiguous memory 385 blocks into "zones", where each zone is a power of two number of 386 pages. This option selects the largest power of two that the kernel 387 keeps in the memory allocator. If you need to allocate very large 388 blocks of physically contiguous memory, then you may need to 389 increase this value. 390 391 This config option is actually maximum order plus one. For example, 392 a value of 11 means that the largest free memory block is 2^10 pages. 393 394 The page size is not necessarily 4KB. Keep this in mind 395 when choosing a value for this option. 396 397config SECCOMP 398 bool "Enable seccomp to safely compute untrusted bytecode" 399 depends on PROC_FS 400 default y 401 help 402 This kernel feature is useful for number crunching applications 403 that may need to compute untrusted bytecode during their 404 execution. By using pipes or other transports made available to 405 the process as file descriptors supporting the read/write 406 syscalls, it's possible to isolate those applications in 407 their own address space using seccomp. Once seccomp is 408 enabled via /proc/<pid>/seccomp, it cannot be disabled 409 and the task is only allowed to execute a few safe syscalls 410 defined by each seccomp mode. 411 412 If unsure, say Y. Only embedded should say N here. 413 414endmenu 415 416config ARCH_SELECT_MEMORY_MODEL 417 def_bool y 418 419config ARCH_FLATMEM_ENABLE 420 def_bool y 421 depends on !NUMA 422 423config ARCH_SPARSEMEM_ENABLE 424 def_bool y 425 help 426 Say Y to support efficient handling of sparse physical memory, 427 for architectures which are either NUMA (Non-Uniform Memory Access) 428 or have huge holes in the physical address space for other reasons. 429 See <file:Documentation/mm/numa.rst> for more. 430 431config ARCH_ENABLE_THP_MIGRATION 432 def_bool y 433 depends on TRANSPARENT_HUGEPAGE 434 435config ARCH_MEMORY_PROBE 436 def_bool y 437 depends on MEMORY_HOTPLUG 438 439config MMU 440 bool 441 default y 442 443config ARCH_MMAP_RND_BITS_MIN 444 default 12 445 446config ARCH_MMAP_RND_BITS_MAX 447 default 18 448 449menu "Power management options" 450 451source "drivers/acpi/Kconfig" 452 453endmenu 454 455source "drivers/firmware/Kconfig" 456