1# 2# Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 3# 4# This program is free software; you can redistribute it and/or modify 5# it under the terms of the GNU General Public License version 2 as 6# published by the Free Software Foundation. 7# 8 9config ARC 10 def_bool y 11 select ARCH_SUPPORTS_ATOMIC_RMW if ARC_HAS_LLSC 12 select BUILDTIME_EXTABLE_SORT 13 select COMMON_CLK 14 select CLONE_BACKWARDS 15 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev 16 select DEVTMPFS if !INITRAMFS_SOURCE="" 17 select GENERIC_ATOMIC64 18 select GENERIC_CLOCKEVENTS 19 select GENERIC_FIND_FIRST_BIT 20 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP 21 select GENERIC_IRQ_SHOW 22 select GENERIC_PENDING_IRQ if SMP 23 select GENERIC_SMP_IDLE_THREAD 24 select HAVE_ARCH_KGDB 25 select HAVE_ARCH_TRACEHOOK 26 select HAVE_FUTEX_CMPXCHG 27 select HAVE_IOREMAP_PROT 28 select HAVE_KPROBES 29 select HAVE_KRETPROBES 30 select HAVE_MEMBLOCK 31 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND 32 select HAVE_OPROFILE 33 select HAVE_PERF_EVENTS 34 select IRQ_DOMAIN 35 select MODULES_USE_ELF_RELA 36 select NO_BOOTMEM 37 select OF 38 select OF_EARLY_FLATTREE 39 select PERF_USE_VMALLOC 40 select HAVE_DEBUG_STACKOVERFLOW 41 42config TRACE_IRQFLAGS_SUPPORT 43 def_bool y 44 45config LOCKDEP_SUPPORT 46 def_bool y 47 48config SCHED_OMIT_FRAME_POINTER 49 def_bool y 50 51config GENERIC_CSUM 52 def_bool y 53 54config RWSEM_GENERIC_SPINLOCK 55 def_bool y 56 57config ARCH_FLATMEM_ENABLE 58 def_bool y 59 60config MMU 61 def_bool y 62 63config NO_IOPORT_MAP 64 def_bool y 65 66config GENERIC_CALIBRATE_DELAY 67 def_bool y 68 69config GENERIC_HWEIGHT 70 def_bool y 71 72config STACKTRACE_SUPPORT 73 def_bool y 74 select STACKTRACE 75 76config HAVE_ARCH_TRANSPARENT_HUGEPAGE 77 def_bool y 78 depends on ARC_MMU_V4 79 80source "init/Kconfig" 81source "kernel/Kconfig.freezer" 82 83menu "ARC Architecture Configuration" 84 85menu "ARC Platform/SoC/Board" 86 87source "arch/arc/plat-sim/Kconfig" 88source "arch/arc/plat-tb10x/Kconfig" 89source "arch/arc/plat-axs10x/Kconfig" 90#New platform adds here 91 92endmenu 93 94choice 95 prompt "ARC Instruction Set" 96 default ISA_ARCOMPACT 97 98config ISA_ARCOMPACT 99 bool "ARCompact ISA" 100 help 101 The original ARC ISA of ARC600/700 cores 102 103config ISA_ARCV2 104 bool "ARC ISA v2" 105 help 106 ISA for the Next Generation ARC-HS cores 107 108endchoice 109 110menu "ARC CPU Configuration" 111 112choice 113 prompt "ARC Core" 114 default ARC_CPU_770 if ISA_ARCOMPACT 115 default ARC_CPU_HS if ISA_ARCV2 116 117if ISA_ARCOMPACT 118 119config ARC_CPU_750D 120 bool "ARC750D" 121 select ARC_CANT_LLSC 122 help 123 Support for ARC750 core 124 125config ARC_CPU_770 126 bool "ARC770" 127 select ARC_HAS_SWAPE 128 help 129 Support for ARC770 core introduced with Rel 4.10 (Summer 2011) 130 This core has a bunch of cool new features: 131 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4) 132 Shared Address Spaces (for sharing TLB entires in MMU) 133 -Caches: New Prog Model, Region Flush 134 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr 135 136endif #ISA_ARCOMPACT 137 138config ARC_CPU_HS 139 bool "ARC-HS" 140 depends on ISA_ARCV2 141 help 142 Support for ARC HS38x Cores based on ARCv2 ISA 143 The notable features are: 144 - SMP configurations of upto 4 core with coherency 145 - Optional L2 Cache and IO-Coherency 146 - Revised Interrupt Architecture (multiple priorites, reg banks, 147 auto stack switch, auto regfile save/restore) 148 - MMUv4 (PIPT dcache, Huge Pages) 149 - Instructions for 150 * 64bit load/store: LDD, STD 151 * Hardware assisted divide/remainder: DIV, REM 152 * Function prologue/epilogue: ENTER_S, LEAVE_S 153 * IRQ enable/disable: CLRI, SETI 154 * pop count: FFS, FLS 155 * SETcc, BMSKN, XBFU... 156 157endchoice 158 159config CPU_BIG_ENDIAN 160 bool "Enable Big Endian Mode" 161 default n 162 help 163 Build kernel for Big Endian Mode of ARC CPU 164 165config SMP 166 bool "Symmetric Multi-Processing" 167 default n 168 select ARC_HAS_COH_CACHES if ISA_ARCV2 169 select ARC_MCIP if ISA_ARCV2 170 help 171 This enables support for systems with more than one CPU. 172 173if SMP 174 175config ARC_HAS_COH_CACHES 176 def_bool n 177 178config ARC_HAS_REENTRANT_IRQ_LV2 179 def_bool n 180 181config ARC_MCIP 182 bool "ARConnect Multicore IP (MCIP) Support " 183 depends on ISA_ARCV2 184 help 185 This IP block enables SMP in ARC-HS38 cores. 186 It provides for cross-core interrupts, multi-core debug 187 hardware semaphores, shared memory,.... 188 189config NR_CPUS 190 int "Maximum number of CPUs (2-4096)" 191 range 2 4096 192 default "4" 193 194config ARC_SMP_HALT_ON_RESET 195 bool "Enable Halt-on-reset boot mode" 196 default y if ARC_UBOOT_SUPPORT 197 help 198 In SMP configuration cores can be configured as Halt-on-reset 199 or they could all start at same time. For Halt-on-reset, non 200 masters are parked until Master kicks them so they can start of 201 at designated entry point. For other case, all jump to common 202 entry point and spin wait for Master's signal. 203 204endif #SMP 205 206menuconfig ARC_CACHE 207 bool "Enable Cache Support" 208 default y 209 # if SMP, cache enabled ONLY if ARC implementation has cache coherency 210 depends on !SMP || ARC_HAS_COH_CACHES 211 212if ARC_CACHE 213 214config ARC_CACHE_LINE_SHIFT 215 int "Cache Line Length (as power of 2)" 216 range 5 7 217 default "6" 218 help 219 Starting with ARC700 4.9, Cache line length is configurable, 220 This option specifies "N", with Line-len = 2 power N 221 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively 222 Linux only supports same line lengths for I and D caches. 223 224config ARC_HAS_ICACHE 225 bool "Use Instruction Cache" 226 default y 227 228config ARC_HAS_DCACHE 229 bool "Use Data Cache" 230 default y 231 232config ARC_CACHE_PAGES 233 bool "Per Page Cache Control" 234 default y 235 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE 236 help 237 This can be used to over-ride the global I/D Cache Enable on a 238 per-page basis (but only for pages accessed via MMU such as 239 Kernel Virtual address or User Virtual Address) 240 TLB entries have a per-page Cache Enable Bit. 241 Note that Global I/D ENABLE + Per Page DISABLE works but corollary 242 Global DISABLE + Per Page ENABLE won't work 243 244config ARC_CACHE_VIPT_ALIASING 245 bool "Support VIPT Aliasing D$" 246 depends on ARC_HAS_DCACHE && ISA_ARCOMPACT 247 default n 248 249endif #ARC_CACHE 250 251config ARC_HAS_ICCM 252 bool "Use ICCM" 253 help 254 Single Cycle RAMS to store Fast Path Code 255 default n 256 257config ARC_ICCM_SZ 258 int "ICCM Size in KB" 259 default "64" 260 depends on ARC_HAS_ICCM 261 262config ARC_HAS_DCCM 263 bool "Use DCCM" 264 help 265 Single Cycle RAMS to store Fast Path Data 266 default n 267 268config ARC_DCCM_SZ 269 int "DCCM Size in KB" 270 default "64" 271 depends on ARC_HAS_DCCM 272 273config ARC_DCCM_BASE 274 hex "DCCM map address" 275 default "0xA0000000" 276 depends on ARC_HAS_DCCM 277 278config ARC_HAS_HW_MPY 279 bool "Use Hardware Multiplier (Normal or Faster XMAC)" 280 default y 281 help 282 Influences how gcc generates code for MPY operations. 283 If enabled, MPYxx insns are generated, provided by Standard/XMAC 284 Multipler. Otherwise software multipy lib is used 285 286choice 287 prompt "MMU Version" 288 default ARC_MMU_V3 if ARC_CPU_770 289 default ARC_MMU_V2 if ARC_CPU_750D 290 default ARC_MMU_V4 if ARC_CPU_HS 291 292if ISA_ARCOMPACT 293 294config ARC_MMU_V1 295 bool "MMU v1" 296 help 297 Orig ARC700 MMU 298 299config ARC_MMU_V2 300 bool "MMU v2" 301 help 302 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio 303 when 2 D-TLB and 1 I-TLB entries index into same 2way set. 304 305config ARC_MMU_V3 306 bool "MMU v3" 307 depends on ARC_CPU_770 308 help 309 Introduced with ARC700 4.10: New Features 310 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4) 311 Shared Address Spaces (SASID) 312 313endif 314 315config ARC_MMU_V4 316 bool "MMU v4" 317 depends on ISA_ARCV2 318 319endchoice 320 321 322choice 323 prompt "MMU Page Size" 324 default ARC_PAGE_SIZE_8K 325 326config ARC_PAGE_SIZE_8K 327 bool "8KB" 328 help 329 Choose between 8k vs 16k 330 331config ARC_PAGE_SIZE_16K 332 bool "16KB" 333 depends on ARC_MMU_V3 || ARC_MMU_V4 334 335config ARC_PAGE_SIZE_4K 336 bool "4KB" 337 depends on ARC_MMU_V3 || ARC_MMU_V4 338 339endchoice 340 341choice 342 prompt "MMU Super Page Size" 343 depends on ISA_ARCV2 && TRANSPARENT_HUGEPAGE 344 default ARC_HUGEPAGE_2M 345 346config ARC_HUGEPAGE_2M 347 bool "2MB" 348 349config ARC_HUGEPAGE_16M 350 bool "16MB" 351 352endchoice 353 354if ISA_ARCOMPACT 355 356config ARC_COMPACT_IRQ_LEVELS 357 bool "ARCompact IRQ Priorities: High(2)/Low(1)" 358 default n 359 # Timer HAS to be high priority, for any other high priority config 360 select ARC_IRQ3_LV2 361 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy 362 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2 363 364if ARC_COMPACT_IRQ_LEVELS 365 366config ARC_IRQ3_LV2 367 bool 368 369config ARC_IRQ5_LV2 370 bool 371 372config ARC_IRQ6_LV2 373 bool 374 375endif #ARC_COMPACT_IRQ_LEVELS 376 377config ARC_FPU_SAVE_RESTORE 378 bool "Enable FPU state persistence across context switch" 379 default n 380 help 381 Double Precision Floating Point unit had dedictaed regs which 382 need to be saved/restored across context-switch. 383 Note that ARC FPU is overly simplistic, unlike say x86, which has 384 hardware pieces to allow software to conditionally save/restore, 385 based on actual usage of FPU by a task. Thus our implemn does 386 this for all tasks in system. 387 388endif #ISA_ARCOMPACT 389 390config ARC_CANT_LLSC 391 def_bool n 392 393config ARC_HAS_LLSC 394 bool "Insn: LLOCK/SCOND (efficient atomic ops)" 395 default y 396 depends on !ARC_CANT_LLSC 397 398config ARC_STAR_9000923308 399 bool "Workaround for llock/scond livelock" 400 default y 401 depends on ISA_ARCV2 && SMP && ARC_HAS_LLSC 402 403config ARC_HAS_SWAPE 404 bool "Insn: SWAPE (endian-swap)" 405 default y 406 407if ISA_ARCV2 408 409config ARC_HAS_LL64 410 bool "Insn: 64bit LDD/STD" 411 help 412 Enable gcc to generate 64-bit load/store instructions 413 ISA mandates even/odd registers to allow encoding of two 414 dest operands with 2 possible source operands. 415 default y 416 417config ARC_HAS_DIV_REM 418 bool "Insn: div, divu, rem, remu" 419 default y 420 421config ARC_HAS_RTC 422 bool "Local 64-bit r/o cycle counter" 423 default n 424 depends on !SMP 425 426config ARC_HAS_GFRC 427 bool "SMP synchronized 64-bit cycle counter" 428 default y 429 depends on SMP 430 431config ARC_NUMBER_OF_INTERRUPTS 432 int "Number of interrupts" 433 range 8 240 434 default 32 435 help 436 This defines the number of interrupts on the ARCv2HS core. 437 It affects the size of vector table. 438 The initial 8 IRQs are fixed (Timer, ICI etc) and although configurable 439 in hardware, it keep things simple for Linux to assume they are always 440 present. 441 442endif # ISA_ARCV2 443 444endmenu # "ARC CPU Configuration" 445 446config LINUX_LINK_BASE 447 hex "Linux Link Address" 448 default "0x80000000" 449 help 450 ARC700 divides the 32 bit phy address space into two equal halves 451 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU 452 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel 453 Typically Linux kernel is linked at the start of untransalted addr, 454 hence the default value of 0x8zs. 455 However some customers have peripherals mapped at this addr, so 456 Linux needs to be scooted a bit. 457 If you don't know what the above means, leave this setting alone. 458 This needs to match memory start address specified in Device Tree 459 460config HIGHMEM 461 bool "High Memory Support" 462 help 463 With ARC 2G:2G address split, only upper 2G is directly addressable by 464 kernel. Enable this to potentially allow access to rest of 2G and PAE 465 in future 466 467config ARC_HAS_PAE40 468 bool "Support for the 40-bit Physical Address Extension" 469 default n 470 depends on ISA_ARCV2 471 select HIGHMEM 472 help 473 Enable access to physical memory beyond 4G, only supported on 474 ARC cores with 40 bit Physical Addressing support 475 476config ARCH_PHYS_ADDR_T_64BIT 477 def_bool ARC_HAS_PAE40 478 479config ARCH_DMA_ADDR_T_64BIT 480 bool 481 482config ARC_CURR_IN_REG 483 bool "Dedicate Register r25 for current_task pointer" 484 default y 485 help 486 This reserved Register R25 to point to Current Task in 487 kernel mode. This saves memory access for each such access 488 489 490config ARC_EMUL_UNALIGNED 491 bool "Emulate unaligned memory access (userspace only)" 492 default N 493 select SYSCTL_ARCH_UNALIGN_NO_WARN 494 select SYSCTL_ARCH_UNALIGN_ALLOW 495 depends on ISA_ARCOMPACT 496 help 497 This enables misaligned 16 & 32 bit memory access from user space. 498 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide 499 potential bugs in code 500 501config HZ 502 int "Timer Frequency" 503 default 100 504 505config ARC_METAWARE_HLINK 506 bool "Support for Metaware debugger assisted Host access" 507 default n 508 help 509 This options allows a Linux userland apps to directly access 510 host file system (open/creat/read/write etc) with help from 511 Metaware Debugger. This can come in handy for Linux-host communication 512 when there is no real usable peripheral such as EMAC. 513 514menuconfig ARC_DBG 515 bool "ARC debugging" 516 default y 517 518if ARC_DBG 519 520config ARC_DW2_UNWIND 521 bool "Enable DWARF specific kernel stack unwind" 522 default y 523 select KALLSYMS 524 help 525 Compiles the kernel with DWARF unwind information and can be used 526 to get stack backtraces. 527 528 If you say Y here the resulting kernel image will be slightly larger 529 but not slower, and it will give very useful debugging information. 530 If you don't debug the kernel, you can say N, but we may not be able 531 to solve problems without frame unwind information 532 533config ARC_DBG_TLB_PARANOIA 534 bool "Paranoia Checks in Low Level TLB Handlers" 535 default n 536 537config ARC_DBG_TLB_MISS_COUNT 538 bool "Profile TLB Misses" 539 default n 540 select DEBUG_FS 541 help 542 Counts number of I and D TLB Misses and exports them via Debugfs 543 The counters can be cleared via Debugfs as well 544 545if SMP 546 547config ARC_IPI_DBG 548 bool "Debug Inter Core interrupts" 549 default n 550 551endif 552 553endif 554 555config ARC_UBOOT_SUPPORT 556 bool "Support uboot arg Handling" 557 default n 558 help 559 ARC Linux by default checks for uboot provided args as pointers to 560 external cmdline or DTB. This however breaks in absence of uboot, 561 when booting from Metaware debugger directly, as the registers are 562 not zeroed out on reset by mdb and/or ARCv2 based cores. The bogus 563 registers look like uboot args to kernel which then chokes. 564 So only enable the uboot arg checking/processing if users are sure 565 of uboot being in play. 566 567config ARC_BUILTIN_DTB_NAME 568 string "Built in DTB" 569 help 570 Set the name of the DTB to embed in the vmlinux binary 571 Leaving it blank selects the minimal "skeleton" dtb 572 573source "kernel/Kconfig.preempt" 574 575menu "Executable file formats" 576source "fs/Kconfig.binfmt" 577endmenu 578 579endmenu # "ARC Architecture Configuration" 580 581source "mm/Kconfig" 582 583config FORCE_MAX_ZONEORDER 584 int "Maximum zone order" 585 default "12" if ARC_HUGEPAGE_16M 586 default "11" 587 588source "net/Kconfig" 589source "drivers/Kconfig" 590source "fs/Kconfig" 591source "arch/arc/Kconfig.debug" 592source "security/Kconfig" 593source "crypto/Kconfig" 594source "lib/Kconfig" 595source "kernel/power/Kconfig" 596