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 BUILDTIME_EXTABLE_SORT 12 select COMMON_CLK 13 select CLONE_BACKWARDS 14 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev 15 select DEVTMPFS if !INITRAMFS_SOURCE="" 16 select GENERIC_ATOMIC64 17 select GENERIC_CLOCKEVENTS 18 select GENERIC_FIND_FIRST_BIT 19 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP 20 select GENERIC_IRQ_SHOW 21 select GENERIC_PENDING_IRQ if SMP 22 select GENERIC_SMP_IDLE_THREAD 23 select HAVE_ARCH_KGDB 24 select HAVE_ARCH_TRACEHOOK 25 select HAVE_IOREMAP_PROT 26 select HAVE_KPROBES 27 select HAVE_KRETPROBES 28 select HAVE_MEMBLOCK 29 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND 30 select HAVE_OPROFILE 31 select HAVE_PERF_EVENTS 32 select IRQ_DOMAIN 33 select MODULES_USE_ELF_RELA 34 select NO_BOOTMEM 35 select OF 36 select OF_EARLY_FLATTREE 37 select PERF_USE_VMALLOC 38 select HAVE_DEBUG_STACKOVERFLOW 39 40config TRACE_IRQFLAGS_SUPPORT 41 def_bool y 42 43config LOCKDEP_SUPPORT 44 def_bool y 45 46config SCHED_OMIT_FRAME_POINTER 47 def_bool y 48 49config GENERIC_CSUM 50 def_bool y 51 52config RWSEM_GENERIC_SPINLOCK 53 def_bool y 54 55config ARCH_FLATMEM_ENABLE 56 def_bool y 57 58config MMU 59 def_bool y 60 61config NO_IOPORT_MAP 62 def_bool y 63 64config GENERIC_CALIBRATE_DELAY 65 def_bool y 66 67config GENERIC_HWEIGHT 68 def_bool y 69 70config STACKTRACE_SUPPORT 71 def_bool y 72 select STACKTRACE 73 74config HAVE_LATENCYTOP_SUPPORT 75 def_bool y 76 77source "init/Kconfig" 78source "kernel/Kconfig.freezer" 79 80menu "ARC Architecture Configuration" 81 82menu "ARC Platform/SoC/Board" 83 84source "arch/arc/plat-arcfpga/Kconfig" 85source "arch/arc/plat-tb10x/Kconfig" 86#New platform adds here 87 88endmenu 89 90menu "ARC CPU Configuration" 91 92choice 93 prompt "ARC Core" 94 default ARC_CPU_770 95 96config ARC_CPU_750D 97 bool "ARC750D" 98 help 99 Support for ARC750 core 100 101config ARC_CPU_770 102 bool "ARC770" 103 select ARC_CPU_REL_4_10 104 help 105 Support for ARC770 core introduced with Rel 4.10 (Summer 2011) 106 This core has a bunch of cool new features: 107 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4) 108 Shared Address Spaces (for sharing TLB entires in MMU) 109 -Caches: New Prog Model, Region Flush 110 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr 111 112endchoice 113 114config CPU_BIG_ENDIAN 115 bool "Enable Big Endian Mode" 116 default n 117 help 118 Build kernel for Big Endian Mode of ARC CPU 119 120# If a platform can't work with 0x8000_0000 based dma_addr_t 121config ARC_PLAT_NEEDS_CPU_TO_DMA 122 bool 123 124config SMP 125 bool "Symmetric Multi-Processing (Incomplete)" 126 default n 127 help 128 This enables support for systems with more than one CPU. If you have 129 a system with only one CPU, say N. If you have a system with more 130 than one CPU, say Y. 131 132if SMP 133 134config ARC_HAS_COH_CACHES 135 def_bool n 136 137config ARC_HAS_REENTRANT_IRQ_LV2 138 def_bool n 139 140endif 141 142config NR_CPUS 143 int "Maximum number of CPUs (2-4096)" 144 range 2 4096 145 depends on SMP 146 default "2" 147 148menuconfig ARC_CACHE 149 bool "Enable Cache Support" 150 default y 151 # if SMP, cache enabled ONLY if ARC implementation has cache coherency 152 depends on !SMP || ARC_HAS_COH_CACHES 153 154if ARC_CACHE 155 156config ARC_CACHE_LINE_SHIFT 157 int "Cache Line Length (as power of 2)" 158 range 5 7 159 default "6" 160 help 161 Starting with ARC700 4.9, Cache line length is configurable, 162 This option specifies "N", with Line-len = 2 power N 163 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively 164 Linux only supports same line lengths for I and D caches. 165 166config ARC_HAS_ICACHE 167 bool "Use Instruction Cache" 168 default y 169 170config ARC_HAS_DCACHE 171 bool "Use Data Cache" 172 default y 173 174config ARC_CACHE_PAGES 175 bool "Per Page Cache Control" 176 default y 177 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE 178 help 179 This can be used to over-ride the global I/D Cache Enable on a 180 per-page basis (but only for pages accessed via MMU such as 181 Kernel Virtual address or User Virtual Address) 182 TLB entries have a per-page Cache Enable Bit. 183 Note that Global I/D ENABLE + Per Page DISABLE works but corollary 184 Global DISABLE + Per Page ENABLE won't work 185 186config ARC_CACHE_VIPT_ALIASING 187 bool "Support VIPT Aliasing D$" 188 depends on ARC_HAS_DCACHE 189 default n 190 191endif #ARC_CACHE 192 193config ARC_HAS_ICCM 194 bool "Use ICCM" 195 help 196 Single Cycle RAMS to store Fast Path Code 197 default n 198 199config ARC_ICCM_SZ 200 int "ICCM Size in KB" 201 default "64" 202 depends on ARC_HAS_ICCM 203 204config ARC_HAS_DCCM 205 bool "Use DCCM" 206 help 207 Single Cycle RAMS to store Fast Path Data 208 default n 209 210config ARC_DCCM_SZ 211 int "DCCM Size in KB" 212 default "64" 213 depends on ARC_HAS_DCCM 214 215config ARC_DCCM_BASE 216 hex "DCCM map address" 217 default "0xA0000000" 218 depends on ARC_HAS_DCCM 219 220config ARC_HAS_HW_MPY 221 bool "Use Hardware Multiplier (Normal or Faster XMAC)" 222 default y 223 help 224 Influences how gcc generates code for MPY operations. 225 If enabled, MPYxx insns are generated, provided by Standard/XMAC 226 Multipler. Otherwise software multipy lib is used 227 228choice 229 prompt "ARC700 MMU Version" 230 default ARC_MMU_V3 if ARC_CPU_770 231 default ARC_MMU_V2 if ARC_CPU_750D 232 233config ARC_MMU_V1 234 bool "MMU v1" 235 help 236 Orig ARC700 MMU 237 238config ARC_MMU_V2 239 bool "MMU v2" 240 help 241 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio 242 when 2 D-TLB and 1 I-TLB entries index into same 2way set. 243 244config ARC_MMU_V3 245 bool "MMU v3" 246 depends on ARC_CPU_770 247 help 248 Introduced with ARC700 4.10: New Features 249 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4) 250 Shared Address Spaces (SASID) 251 252endchoice 253 254 255choice 256 prompt "MMU Page Size" 257 default ARC_PAGE_SIZE_8K 258 259config ARC_PAGE_SIZE_8K 260 bool "8KB" 261 help 262 Choose between 8k vs 16k 263 264config ARC_PAGE_SIZE_16K 265 bool "16KB" 266 depends on ARC_MMU_V3 267 268config ARC_PAGE_SIZE_4K 269 bool "4KB" 270 depends on ARC_MMU_V3 271 272endchoice 273 274config ARC_COMPACT_IRQ_LEVELS 275 bool "ARCompact IRQ Priorities: High(2)/Low(1)" 276 default n 277 # Timer HAS to be high priority, for any other high priority config 278 select ARC_IRQ3_LV2 279 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy 280 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2 281 282if ARC_COMPACT_IRQ_LEVELS 283 284config ARC_IRQ3_LV2 285 bool 286 287config ARC_IRQ5_LV2 288 bool 289 290config ARC_IRQ6_LV2 291 bool 292 293endif 294 295config ARC_FPU_SAVE_RESTORE 296 bool "Enable FPU state persistence across context switch" 297 default n 298 help 299 Double Precision Floating Point unit had dedictaed regs which 300 need to be saved/restored across context-switch. 301 Note that ARC FPU is overly simplistic, unlike say x86, which has 302 hardware pieces to allow software to conditionally save/restore, 303 based on actual usage of FPU by a task. Thus our implemn does 304 this for all tasks in system. 305 306config ARC_CANT_LLSC 307 def_bool n 308 309menuconfig ARC_CPU_REL_4_10 310 bool "Enable support for Rel 4.10 features" 311 default n 312 help 313 -ARC770 (and dependent features) enabled 314 -ARC750 also shares some of the new features with 770 315 316config ARC_HAS_LLSC 317 bool "Insn: LLOCK/SCOND (efficient atomic ops)" 318 default y 319 depends on ARC_CPU_770 && !ARC_CANT_LLSC 320 321config ARC_HAS_SWAPE 322 bool "Insn: SWAPE (endian-swap)" 323 default y 324 depends on ARC_CPU_REL_4_10 325 326config ARC_HAS_RTSC 327 bool "Insn: RTSC (64-bit r/o cycle counter)" 328 default y 329 depends on ARC_CPU_REL_4_10 330 depends on !SMP 331 332endmenu # "ARC CPU Configuration" 333 334config LINUX_LINK_BASE 335 hex "Linux Link Address" 336 default "0x80000000" 337 help 338 ARC700 divides the 32 bit phy address space into two equal halves 339 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU 340 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel 341 Typically Linux kernel is linked at the start of untransalted addr, 342 hence the default value of 0x8zs. 343 However some customers have peripherals mapped at this addr, so 344 Linux needs to be scooted a bit. 345 If you don't know what the above means, leave this setting alone. 346 347config ARC_CURR_IN_REG 348 bool "Dedicate Register r25 for current_task pointer" 349 default y 350 help 351 This reserved Register R25 to point to Current Task in 352 kernel mode. This saves memory access for each such access 353 354 355config ARC_EMUL_UNALIGNED 356 bool "Emulate unaligned memory access (userspace only)" 357 select SYSCTL_ARCH_UNALIGN_NO_WARN 358 select SYSCTL_ARCH_UNALIGN_ALLOW 359 help 360 This enables misaligned 16 & 32 bit memory access from user space. 361 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide 362 potential bugs in code 363 364config HZ 365 int "Timer Frequency" 366 default 100 367 368config ARC_METAWARE_HLINK 369 bool "Support for Metaware debugger assisted Host access" 370 default n 371 help 372 This options allows a Linux userland apps to directly access 373 host file system (open/creat/read/write etc) with help from 374 Metaware Debugger. This can come in handy for Linux-host communication 375 when there is no real usable peripheral such as EMAC. 376 377menuconfig ARC_DBG 378 bool "ARC debugging" 379 default y 380 381config ARC_DW2_UNWIND 382 bool "Enable DWARF specific kernel stack unwind" 383 depends on ARC_DBG 384 default y 385 select KALLSYMS 386 help 387 Compiles the kernel with DWARF unwind information and can be used 388 to get stack backtraces. 389 390 If you say Y here the resulting kernel image will be slightly larger 391 but not slower, and it will give very useful debugging information. 392 If you don't debug the kernel, you can say N, but we may not be able 393 to solve problems without frame unwind information 394 395config ARC_DBG_TLB_PARANOIA 396 bool "Paranoia Checks in Low Level TLB Handlers" 397 depends on ARC_DBG 398 default n 399 400config ARC_DBG_TLB_MISS_COUNT 401 bool "Profile TLB Misses" 402 default n 403 select DEBUG_FS 404 depends on ARC_DBG 405 help 406 Counts number of I and D TLB Misses and exports them via Debugfs 407 The counters can be cleared via Debugfs as well 408 409config ARC_BUILTIN_DTB_NAME 410 string "Built in DTB" 411 help 412 Set the name of the DTB to embed in the vmlinux binary 413 Leaving it blank selects the minimal "skeleton" dtb 414 415source "kernel/Kconfig.preempt" 416 417menu "Executable file formats" 418source "fs/Kconfig.binfmt" 419endmenu 420 421endmenu # "ARC Architecture Configuration" 422 423source "mm/Kconfig" 424source "net/Kconfig" 425source "drivers/Kconfig" 426source "fs/Kconfig" 427source "arch/arc/Kconfig.debug" 428source "security/Kconfig" 429source "crypto/Kconfig" 430source "lib/Kconfig" 431source "kernel/power/Kconfig" 432