tjh.dev / kernel
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kernel / arch / arc / Kconfig
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1# SPDX-License-Identifier: GPL-2.0-only 2# 3# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4# 5 6config ARC 7 def_bool y 8 select ARC_TIMERS 9 select ARCH_HAS_CACHE_LINE_SIZE 10 select ARCH_HAS_DEBUG_VM_PGTABLE 11 select ARCH_HAS_DMA_PREP_COHERENT 12 select ARCH_HAS_PTE_SPECIAL 13 select ARCH_HAS_SETUP_DMA_OPS 14 select ARCH_HAS_SYNC_DMA_FOR_CPU 15 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 16 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC 17 select ARCH_32BIT_OFF_T 18 select BUILDTIME_TABLE_SORT 19 select CLONE_BACKWARDS 20 select COMMON_CLK 21 select DMA_DIRECT_REMAP 22 select GENERIC_ATOMIC64 if !ISA_ARCV2 || !(ARC_HAS_LL64 && ARC_HAS_LLSC) 23 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP 24 select GENERIC_IRQ_SHOW 25 select GENERIC_PCI_IOMAP 26 select GENERIC_PENDING_IRQ if SMP 27 select GENERIC_SCHED_CLOCK 28 select GENERIC_SMP_IDLE_THREAD 29 select HAVE_ARCH_KGDB 30 select HAVE_ARCH_TRACEHOOK 31 select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4 32 select HAVE_DEBUG_STACKOVERFLOW 33 select HAVE_DEBUG_KMEMLEAK 34 select HAVE_IOREMAP_PROT 35 select HAVE_KERNEL_GZIP 36 select HAVE_KERNEL_LZMA 37 select HAVE_KPROBES 38 select HAVE_KRETPROBES 39 select HAVE_REGS_AND_STACK_ACCESS_API 40 select HAVE_MOD_ARCH_SPECIFIC 41 select HAVE_PERF_EVENTS 42 select HAVE_SYSCALL_TRACEPOINTS 43 select IRQ_DOMAIN 44 select MODULES_USE_ELF_RELA 45 select OF 46 select OF_EARLY_FLATTREE 47 select PCI_SYSCALL if PCI 48 select PERF_USE_VMALLOC if ARC_CACHE_VIPT_ALIASING 49 select HAVE_ARCH_JUMP_LABEL if ISA_ARCV2 && !CPU_ENDIAN_BE32 50 select TRACE_IRQFLAGS_SUPPORT 51 52config LOCKDEP_SUPPORT 53 def_bool y 54 55config SCHED_OMIT_FRAME_POINTER 56 def_bool y 57 58config GENERIC_CSUM 59 def_bool y 60 61config ARCH_FLATMEM_ENABLE 62 def_bool y 63 64config MMU 65 def_bool y 66 67config NO_IOPORT_MAP 68 def_bool y 69 70config GENERIC_CALIBRATE_DELAY 71 def_bool y 72 73config GENERIC_HWEIGHT 74 def_bool y 75 76config STACKTRACE_SUPPORT 77 def_bool y 78 select STACKTRACE 79 80menu "ARC Architecture Configuration" 81 82menu "ARC Platform/SoC/Board" 83 84source "arch/arc/plat-tb10x/Kconfig" 85source "arch/arc/plat-axs10x/Kconfig" 86source "arch/arc/plat-hsdk/Kconfig" 87 88endmenu 89 90choice 91 prompt "ARC Instruction Set" 92 default ISA_ARCV2 93 94config ISA_ARCOMPACT 95 bool "ARCompact ISA" 96 select CPU_NO_EFFICIENT_FFS 97 help 98 The original ARC ISA of ARC600/700 cores 99 100config ISA_ARCV2 101 bool "ARC ISA v2" 102 select ARC_TIMERS_64BIT 103 help 104 ISA for the Next Generation ARC-HS cores 105 106endchoice 107 108menu "ARC CPU Configuration" 109 110choice 111 prompt "ARC Core" 112 default ARC_CPU_770 if ISA_ARCOMPACT 113 default ARC_CPU_HS if ISA_ARCV2 114 115config ARC_CPU_770 116 bool "ARC770" 117 depends on ISA_ARCOMPACT 118 select ARC_HAS_SWAPE 119 help 120 Support for ARC770 core introduced with Rel 4.10 (Summer 2011) 121 This core has a bunch of cool new features: 122 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4) 123 Shared Address Spaces (for sharing TLB entries in MMU) 124 -Caches: New Prog Model, Region Flush 125 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr 126 127config ARC_CPU_HS 128 bool "ARC-HS" 129 depends on ISA_ARCV2 130 help 131 Support for ARC HS38x Cores based on ARCv2 ISA 132 The notable features are: 133 - SMP configurations of up to 4 cores with coherency 134 - Optional L2 Cache and IO-Coherency 135 - Revised Interrupt Architecture (multiple priorites, reg banks, 136 auto stack switch, auto regfile save/restore) 137 - MMUv4 (PIPT dcache, Huge Pages) 138 - Instructions for 139 * 64bit load/store: LDD, STD 140 * Hardware assisted divide/remainder: DIV, REM 141 * Function prologue/epilogue: ENTER_S, LEAVE_S 142 * IRQ enable/disable: CLRI, SETI 143 * pop count: FFS, FLS 144 * SETcc, BMSKN, XBFU... 145 146endchoice 147 148config ARC_TUNE_MCPU 149 string "Override default -mcpu compiler flag" 150 default "" 151 help 152 Override default -mcpu=xxx compiler flag (which is set depending on 153 the ISA version) with the specified value. 154 NOTE: If specified flag isn't supported by current compiler the 155 ISA default value will be used as a fallback. 156 157config CPU_BIG_ENDIAN 158 bool "Enable Big Endian Mode" 159 help 160 Build kernel for Big Endian Mode of ARC CPU 161 162config SMP 163 bool "Symmetric Multi-Processing" 164 select ARC_MCIP if ISA_ARCV2 165 help 166 This enables support for systems with more than one CPU. 167 168if SMP 169 170config NR_CPUS 171 int "Maximum number of CPUs (2-4096)" 172 range 2 4096 173 default "4" 174 175config ARC_SMP_HALT_ON_RESET 176 bool "Enable Halt-on-reset boot mode" 177 help 178 In SMP configuration cores can be configured as Halt-on-reset 179 or they could all start at same time. For Halt-on-reset, non 180 masters are parked until Master kicks them so they can start off 181 at designated entry point. For other case, all jump to common 182 entry point and spin wait for Master's signal. 183 184endif #SMP 185 186config ARC_MCIP 187 bool "ARConnect Multicore IP (MCIP) Support " 188 depends on ISA_ARCV2 189 default y if SMP 190 help 191 This IP block enables SMP in ARC-HS38 cores. 192 It provides for cross-core interrupts, multi-core debug 193 hardware semaphores, shared memory,.... 194 195menuconfig ARC_CACHE 196 bool "Enable Cache Support" 197 default y 198 199if ARC_CACHE 200 201config ARC_CACHE_LINE_SHIFT 202 int "Cache Line Length (as power of 2)" 203 range 5 7 204 default "6" 205 help 206 Starting with ARC700 4.9, Cache line length is configurable, 207 This option specifies "N", with Line-len = 2 power N 208 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively 209 Linux only supports same line lengths for I and D caches. 210 211config ARC_HAS_ICACHE 212 bool "Use Instruction Cache" 213 default y 214 215config ARC_HAS_DCACHE 216 bool "Use Data Cache" 217 default y 218 219config ARC_CACHE_PAGES 220 bool "Per Page Cache Control" 221 default y 222 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE 223 help 224 This can be used to over-ride the global I/D Cache Enable on a 225 per-page basis (but only for pages accessed via MMU such as 226 Kernel Virtual address or User Virtual Address) 227 TLB entries have a per-page Cache Enable Bit. 228 Note that Global I/D ENABLE + Per Page DISABLE works but corollary 229 Global DISABLE + Per Page ENABLE won't work 230 231config ARC_CACHE_VIPT_ALIASING 232 bool "Support VIPT Aliasing D$" 233 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT 234 235endif #ARC_CACHE 236 237config ARC_HAS_ICCM 238 bool "Use ICCM" 239 help 240 Single Cycle RAMS to store Fast Path Code 241 242config ARC_ICCM_SZ 243 int "ICCM Size in KB" 244 default "64" 245 depends on ARC_HAS_ICCM 246 247config ARC_HAS_DCCM 248 bool "Use DCCM" 249 help 250 Single Cycle RAMS to store Fast Path Data 251 252config ARC_DCCM_SZ 253 int "DCCM Size in KB" 254 default "64" 255 depends on ARC_HAS_DCCM 256 257config ARC_DCCM_BASE 258 hex "DCCM map address" 259 default "0xA0000000" 260 depends on ARC_HAS_DCCM 261 262choice 263 prompt "MMU Version" 264 default ARC_MMU_V3 if ISA_ARCOMPACT 265 default ARC_MMU_V4 if ISA_ARCV2 266 267config ARC_MMU_V3 268 bool "MMU v3" 269 depends on ISA_ARCOMPACT 270 help 271 Introduced with ARC700 4.10: New Features 272 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4) 273 Shared Address Spaces (SASID) 274 275config ARC_MMU_V4 276 bool "MMU v4" 277 depends on ISA_ARCV2 278 279endchoice 280 281 282choice 283 prompt "MMU Page Size" 284 default ARC_PAGE_SIZE_8K 285 286config ARC_PAGE_SIZE_8K 287 bool "8KB" 288 help 289 Choose between 8k vs 16k 290 291config ARC_PAGE_SIZE_16K 292 bool "16KB" 293 294config ARC_PAGE_SIZE_4K 295 bool "4KB" 296 depends on ARC_MMU_V3 || ARC_MMU_V4 297 298endchoice 299 300choice 301 prompt "MMU Super Page Size" 302 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE 303 default ARC_HUGEPAGE_2M 304 305config ARC_HUGEPAGE_2M 306 bool "2MB" 307 308config ARC_HUGEPAGE_16M 309 bool "16MB" 310 311endchoice 312 313config PGTABLE_LEVELS 314 int "Number of Page table levels" 315 default 2 316 317config ARC_COMPACT_IRQ_LEVELS 318 depends on ISA_ARCOMPACT 319 bool "Setup Timer IRQ as high Priority" 320 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy 321 depends on !SMP 322 323config ARC_FPU_SAVE_RESTORE 324 bool "Enable FPU state persistence across context switch" 325 help 326 ARCompact FPU has internal registers to assist with Double precision 327 Floating Point operations. There are control and stauts registers 328 for floating point exceptions and rounding modes. These are 329 preserved across task context switch when enabled. 330 331config ARC_CANT_LLSC 332 def_bool n 333 334config ARC_HAS_LLSC 335 bool "Insn: LLOCK/SCOND (efficient atomic ops)" 336 default y 337 depends on !ARC_CANT_LLSC 338 339config ARC_HAS_SWAPE 340 bool "Insn: SWAPE (endian-swap)" 341 default y 342 343if ISA_ARCV2 344 345config ARC_USE_UNALIGNED_MEM_ACCESS 346 bool "Enable unaligned access in HW" 347 default y 348 select HAVE_EFFICIENT_UNALIGNED_ACCESS 349 help 350 The ARC HS architecture supports unaligned memory access 351 which is disabled by default. Enable unaligned access in 352 hardware and use software to use it 353 354config ARC_HAS_LL64 355 bool "Insn: 64bit LDD/STD" 356 help 357 Enable gcc to generate 64-bit load/store instructions 358 ISA mandates even/odd registers to allow encoding of two 359 dest operands with 2 possible source operands. 360 default y 361 362config ARC_HAS_DIV_REM 363 bool "Insn: div, divu, rem, remu" 364 default y 365 366config ARC_HAS_ACCL_REGS 367 bool "Reg Pair ACCL:ACCH (FPU and/or MPY > 6 and/or DSP)" 368 default y 369 help 370 Depending on the configuration, CPU can contain accumulator reg-pair 371 (also referred to as r58:r59). These can also be used by gcc as GPR so 372 kernel needs to save/restore per process 373 374config ARC_DSP_HANDLED 375 def_bool n 376 377config ARC_DSP_SAVE_RESTORE_REGS 378 def_bool n 379 380choice 381 prompt "DSP support" 382 default ARC_DSP_NONE 383 help 384 Depending on the configuration, CPU can contain DSP registers 385 (ACC0_GLO, ACC0_GHI, DSP_BFLY0, DSP_CTRL, DSP_FFT_CTRL). 386 Below are options describing how to handle these registers in 387 interrupt entry / exit and in context switch. 388 389config ARC_DSP_NONE 390 bool "No DSP extension presence in HW" 391 help 392 No DSP extension presence in HW 393 394config ARC_DSP_KERNEL 395 bool "DSP extension in HW, no support for userspace" 396 select ARC_HAS_ACCL_REGS 397 select ARC_DSP_HANDLED 398 help 399 DSP extension presence in HW, no support for DSP-enabled userspace 400 applications. We don't save / restore DSP registers and only do 401 some minimal preparations so userspace won't be able to break kernel 402 403config ARC_DSP_USERSPACE 404 bool "Support DSP for userspace apps" 405 select ARC_HAS_ACCL_REGS 406 select ARC_DSP_HANDLED 407 select ARC_DSP_SAVE_RESTORE_REGS 408 help 409 DSP extension presence in HW, support save / restore DSP registers to 410 run DSP-enabled userspace applications 411 412config ARC_DSP_AGU_USERSPACE 413 bool "Support DSP with AGU for userspace apps" 414 select ARC_HAS_ACCL_REGS 415 select ARC_DSP_HANDLED 416 select ARC_DSP_SAVE_RESTORE_REGS 417 help 418 DSP and AGU extensions presence in HW, support save / restore DSP 419 and AGU registers to run DSP-enabled userspace applications 420endchoice 421 422config ARC_IRQ_NO_AUTOSAVE 423 bool "Disable hardware autosave regfile on interrupts" 424 default n 425 help 426 On HS cores, taken interrupt auto saves the regfile on stack. 427 This is programmable and can be optionally disabled in which case 428 software INTERRUPT_PROLOGUE/EPILGUE do the needed work 429 430config ARC_LPB_DISABLE 431 bool "Disable loop buffer (LPB)" 432 help 433 On HS cores, loop buffer (LPB) is programmable in runtime and can 434 be optionally disabled. 435 436endif # ISA_ARCV2 437 438endmenu # "ARC CPU Configuration" 439 440config LINUX_LINK_BASE 441 hex "Kernel link address" 442 default "0x80000000" 443 help 444 ARC700 divides the 32 bit phy address space into two equal halves 445 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU 446 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel 447 Typically Linux kernel is linked at the start of untransalted addr, 448 hence the default value of 0x8zs. 449 However some customers have peripherals mapped at this addr, so 450 Linux needs to be scooted a bit. 451 If you don't know what the above means, leave this setting alone. 452 This needs to match memory start address specified in Device Tree 453 454config LINUX_RAM_BASE 455 hex "RAM base address" 456 default LINUX_LINK_BASE 457 help 458 By default Linux is linked at base of RAM. However in some special 459 cases (such as HSDK), Linux can't be linked at start of DDR, hence 460 this option. 461 462config HIGHMEM 463 bool "High Memory Support" 464 select HAVE_ARCH_PFN_VALID 465 select KMAP_LOCAL 466 help 467 With ARC 2G:2G address split, only upper 2G is directly addressable by 468 kernel. Enable this to potentially allow access to rest of 2G and PAE 469 in future 470 471config ARC_HAS_PAE40 472 bool "Support for the 40-bit Physical Address Extension" 473 depends on ISA_ARCV2 474 select HIGHMEM 475 select PHYS_ADDR_T_64BIT 476 help 477 Enable access to physical memory beyond 4G, only supported on 478 ARC cores with 40 bit Physical Addressing support 479 480config ARC_KVADDR_SIZE 481 int "Kernel Virtual Address Space size (MB)" 482 range 0 512 483 default "256" 484 help 485 The kernel address space is carved out of 256MB of translated address 486 space for catering to vmalloc, modules, pkmap, fixmap. This however may 487 not suffice vmalloc requirements of a 4K CPU EZChip system. So allow 488 this to be stretched to 512 MB (by extending into the reserved 489 kernel-user gutter) 490 491config ARC_CURR_IN_REG 492 bool "Dedicate Register r25 for current_task pointer" 493 default y 494 help 495 This reserved Register R25 to point to Current Task in 496 kernel mode. This saves memory access for each such access 497 498 499config ARC_EMUL_UNALIGNED 500 bool "Emulate unaligned memory access (userspace only)" 501 select SYSCTL_ARCH_UNALIGN_NO_WARN 502 select SYSCTL_ARCH_UNALIGN_ALLOW 503 depends on ISA_ARCOMPACT 504 help 505 This enables misaligned 16 & 32 bit memory access from user space. 506 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide 507 potential bugs in code 508 509config HZ 510 int "Timer Frequency" 511 default 100 512 513config ARC_METAWARE_HLINK 514 bool "Support for Metaware debugger assisted Host access" 515 help 516 This options allows a Linux userland apps to directly access 517 host file system (open/creat/read/write etc) with help from 518 Metaware Debugger. This can come in handy for Linux-host communication 519 when there is no real usable peripheral such as EMAC. 520 521menuconfig ARC_DBG 522 bool "ARC debugging" 523 default y 524 525if ARC_DBG 526 527config ARC_DW2_UNWIND 528 bool "Enable DWARF specific kernel stack unwind" 529 default y 530 select KALLSYMS 531 help 532 Compiles the kernel with DWARF unwind information and can be used 533 to get stack backtraces. 534 535 If you say Y here the resulting kernel image will be slightly larger 536 but not slower, and it will give very useful debugging information. 537 If you don't debug the kernel, you can say N, but we may not be able 538 to solve problems without frame unwind information 539 540config ARC_DBG_JUMP_LABEL 541 bool "Paranoid checks in Static Keys (jump labels) code" 542 depends on JUMP_LABEL 543 default y if STATIC_KEYS_SELFTEST 544 help 545 Enable paranoid checks and self-test of both ARC-specific and generic 546 part of static keys (jump labels) related code. 547endif 548 549config ARC_BUILTIN_DTB_NAME 550 string "Built in DTB" 551 help 552 Set the name of the DTB to embed in the vmlinux binary 553 Leaving it blank selects the minimal "skeleton" dtb 554 555endmenu # "ARC Architecture Configuration" 556 557config ARCH_FORCE_MAX_ORDER 558 int "Maximum zone order" 559 default "12" if ARC_HUGEPAGE_16M 560 default "11" 561 562source "kernel/power/Kconfig"