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 select MMU_GATHER_MERGE_VMAS if MMU 112 113config 32BIT 114 bool 115 116config 64BIT 117 def_bool y 118 119config CPU_HAS_FPU 120 bool 121 default y 122 123config CPU_HAS_PREFETCH 124 bool 125 default y 126 127config GENERIC_CALIBRATE_DELAY 128 def_bool y 129 130config GENERIC_CSUM 131 def_bool y 132 133config GENERIC_HWEIGHT 134 def_bool y 135 136config L1_CACHE_SHIFT 137 int 138 default "6" 139 140config LOCKDEP_SUPPORT 141 bool 142 default y 143 144# MACH_LOONGSON32 and MACH_LOONGSON64 are delibrately carried over from the 145# MIPS Loongson code, to preserve Loongson-specific code paths in drivers that 146# are shared between architectures, and specifically expecting the symbols. 147config MACH_LOONGSON32 148 def_bool 32BIT 149 150config MACH_LOONGSON64 151 def_bool 64BIT 152 153config PAGE_SIZE_4KB 154 bool 155 156config PAGE_SIZE_16KB 157 bool 158 159config PAGE_SIZE_64KB 160 bool 161 162config PGTABLE_2LEVEL 163 bool 164 165config PGTABLE_3LEVEL 166 bool 167 168config PGTABLE_4LEVEL 169 bool 170 171config PGTABLE_LEVELS 172 int 173 default 2 if PGTABLE_2LEVEL 174 default 3 if PGTABLE_3LEVEL 175 default 4 if PGTABLE_4LEVEL 176 177config SCHED_OMIT_FRAME_POINTER 178 bool 179 default y 180 181menu "Kernel type and options" 182 183source "kernel/Kconfig.hz" 184 185choice 186 prompt "Page Table Layout" 187 default 16KB_2LEVEL if 32BIT 188 default 16KB_3LEVEL if 64BIT 189 help 190 Allows choosing the page table layout, which is a combination 191 of page size and page table levels. The size of virtual memory 192 address space are determined by the page table layout. 193 194config 4KB_3LEVEL 195 bool "4KB with 3 levels" 196 select PAGE_SIZE_4KB 197 select PGTABLE_3LEVEL 198 help 199 This option selects 4KB page size with 3 level page tables, which 200 support a maximum of 39 bits of application virtual memory. 201 202config 4KB_4LEVEL 203 bool "4KB with 4 levels" 204 select PAGE_SIZE_4KB 205 select PGTABLE_4LEVEL 206 help 207 This option selects 4KB page size with 4 level page tables, which 208 support a maximum of 48 bits of application virtual memory. 209 210config 16KB_2LEVEL 211 bool "16KB with 2 levels" 212 select PAGE_SIZE_16KB 213 select PGTABLE_2LEVEL 214 help 215 This option selects 16KB page size with 2 level page tables, which 216 support a maximum of 36 bits of application virtual memory. 217 218config 16KB_3LEVEL 219 bool "16KB with 3 levels" 220 select PAGE_SIZE_16KB 221 select PGTABLE_3LEVEL 222 help 223 This option selects 16KB page size with 3 level page tables, which 224 support a maximum of 47 bits of application virtual memory. 225 226config 64KB_2LEVEL 227 bool "64KB with 2 levels" 228 select PAGE_SIZE_64KB 229 select PGTABLE_2LEVEL 230 help 231 This option selects 64KB page size with 2 level page tables, which 232 support a maximum of 42 bits of application virtual memory. 233 234config 64KB_3LEVEL 235 bool "64KB with 3 levels" 236 select PAGE_SIZE_64KB 237 select PGTABLE_3LEVEL 238 help 239 This option selects 64KB page size with 3 level page tables, which 240 support a maximum of 55 bits of application virtual memory. 241 242endchoice 243 244config CMDLINE 245 string "Built-in kernel command line" 246 help 247 For most platforms, the arguments for the kernel's command line 248 are provided at run-time, during boot. However, there are cases 249 where either no arguments are being provided or the provided 250 arguments are insufficient or even invalid. 251 252 When that occurs, it is possible to define a built-in command 253 line here and choose how the kernel should use it later on. 254 255choice 256 prompt "Kernel command line type" 257 default CMDLINE_BOOTLOADER 258 help 259 Choose how the kernel will handle the provided built-in command 260 line. 261 262config CMDLINE_BOOTLOADER 263 bool "Use bootloader kernel arguments if available" 264 help 265 Prefer the command-line passed by the boot loader if available. 266 Use the built-in command line as fallback in case we get nothing 267 during boot. This is the default behaviour. 268 269config CMDLINE_EXTEND 270 bool "Use built-in to extend bootloader kernel arguments" 271 help 272 The command-line arguments provided during boot will be 273 appended to the built-in command line. This is useful in 274 cases where the provided arguments are insufficient and 275 you don't want to or cannot modify them. 276 277config CMDLINE_FORCE 278 bool "Always use the built-in kernel command string" 279 help 280 Always use the built-in command line, even if we get one during 281 boot. This is useful in case you need to override the provided 282 command line on systems where you don't have or want control 283 over it. 284 285endchoice 286 287config DMI 288 bool "Enable DMI scanning" 289 select DMI_SCAN_MACHINE_NON_EFI_FALLBACK 290 default y 291 help 292 This enables SMBIOS/DMI feature for systems, and scanning of 293 DMI to identify machine quirks. 294 295config EFI 296 bool "EFI runtime service support" 297 select UCS2_STRING 298 select EFI_PARAMS_FROM_FDT 299 select EFI_RUNTIME_WRAPPERS 300 help 301 This enables the kernel to use EFI runtime services that are 302 available (such as the EFI variable services). 303 304config SMP 305 bool "Multi-Processing support" 306 help 307 This enables support for systems with more than one CPU. If you have 308 a system with only one CPU, say N. If you have a system with more 309 than one CPU, say Y. 310 311 If you say N here, the kernel will run on uni- and multiprocessor 312 machines, but will use only one CPU of a multiprocessor machine. If 313 you say Y here, the kernel will run on many, but not all, 314 uniprocessor machines. On a uniprocessor machine, the kernel 315 will run faster if you say N here. 316 317 See also the SMP-HOWTO available at <http://www.tldp.org/docs.html#howto>. 318 319 If you don't know what to do here, say N. 320 321config HOTPLUG_CPU 322 bool "Support for hot-pluggable CPUs" 323 depends on SMP 324 select GENERIC_IRQ_MIGRATION 325 help 326 Say Y here to allow turning CPUs off and on. CPUs can be 327 controlled through /sys/devices/system/cpu. 328 (Note: power management support will enable this option 329 automatically on SMP systems. ) 330 Say N if you want to disable CPU hotplug. 331 332config NR_CPUS 333 int "Maximum number of CPUs (2-256)" 334 range 2 256 335 depends on SMP 336 default "64" 337 help 338 This allows you to specify the maximum number of CPUs which this 339 kernel will support. 340 341config NUMA 342 bool "NUMA Support" 343 select SMP 344 select ACPI_NUMA if ACPI 345 help 346 Say Y to compile the kernel with NUMA (Non-Uniform Memory Access) 347 support. This option improves performance on systems with more 348 than one NUMA node; on single node systems it is generally better 349 to leave it disabled. 350 351config NODES_SHIFT 352 int 353 default "6" 354 depends on NUMA 355 356config FORCE_MAX_ZONEORDER 357 int "Maximum zone order" 358 range 14 64 if PAGE_SIZE_64KB 359 default "14" if PAGE_SIZE_64KB 360 range 12 64 if PAGE_SIZE_16KB 361 default "12" if PAGE_SIZE_16KB 362 range 11 64 363 default "11" 364 help 365 The kernel memory allocator divides physically contiguous memory 366 blocks into "zones", where each zone is a power of two number of 367 pages. This option selects the largest power of two that the kernel 368 keeps in the memory allocator. If you need to allocate very large 369 blocks of physically contiguous memory, then you may need to 370 increase this value. 371 372 This config option is actually maximum order plus one. For example, 373 a value of 11 means that the largest free memory block is 2^10 pages. 374 375 The page size is not necessarily 4KB. Keep this in mind 376 when choosing a value for this option. 377 378config SECCOMP 379 bool "Enable seccomp to safely compute untrusted bytecode" 380 depends on PROC_FS 381 default y 382 help 383 This kernel feature is useful for number crunching applications 384 that may need to compute untrusted bytecode during their 385 execution. By using pipes or other transports made available to 386 the process as file descriptors supporting the read/write 387 syscalls, it's possible to isolate those applications in 388 their own address space using seccomp. Once seccomp is 389 enabled via /proc/<pid>/seccomp, it cannot be disabled 390 and the task is only allowed to execute a few safe syscalls 391 defined by each seccomp mode. 392 393 If unsure, say Y. Only embedded should say N here. 394 395endmenu 396 397config ARCH_SELECT_MEMORY_MODEL 398 def_bool y 399 400config ARCH_FLATMEM_ENABLE 401 def_bool y 402 depends on !NUMA 403 404config ARCH_SPARSEMEM_ENABLE 405 def_bool y 406 help 407 Say Y to support efficient handling of sparse physical memory, 408 for architectures which are either NUMA (Non-Uniform Memory Access) 409 or have huge holes in the physical address space for other reasons. 410 See <file:Documentation/vm/numa.rst> for more. 411 412config ARCH_ENABLE_THP_MIGRATION 413 def_bool y 414 depends on TRANSPARENT_HUGEPAGE 415 416config ARCH_MEMORY_PROBE 417 def_bool y 418 depends on MEMORY_HOTPLUG 419 420config MMU 421 bool 422 default y 423 424config ARCH_MMAP_RND_BITS_MIN 425 default 12 426 427config ARCH_MMAP_RND_BITS_MAX 428 default 18 429 430menu "Power management options" 431 432source "drivers/acpi/Kconfig" 433 434endmenu 435 436source "drivers/firmware/Kconfig" 437