arch/arc/Kconfig

   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
   9 config ARC
  10         def_bool y
  11         select CLONE_BACKWARDS
  12         # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
  13         select DEVTMPFS if !INITRAMFS_SOURCE=""
  14         select GENERIC_ATOMIC64
  15         select GENERIC_CLOCKEVENTS
  16         select GENERIC_FIND_FIRST_BIT
  17         # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
  18         select GENERIC_IRQ_SHOW
  19         select GENERIC_PENDING_IRQ if SMP
  20         select GENERIC_SMP_IDLE_THREAD
  21         select HAVE_ARCH_KGDB
  22         select HAVE_ARCH_TRACEHOOK
  23         select HAVE_IOREMAP_PROT
  24         select HAVE_KPROBES
  25         select HAVE_KRETPROBES
  26         select HAVE_MEMBLOCK
  27         select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
  28         select HAVE_OPROFILE
  29         select HAVE_PERF_EVENTS
  30         select IRQ_DOMAIN
  31         select MODULES_USE_ELF_RELA
  32         select NO_BOOTMEM
  33         select OF
  34         select OF_EARLY_FLATTREE
  35         select PERF_USE_VMALLOC
  36         select HAVE_DEBUG_STACKOVERFLOW
  37
  38 config TRACE_IRQFLAGS_SUPPORT
  39         def_bool y
  40
  41 config LOCKDEP_SUPPORT
  42         def_bool y
  43
  44 config SCHED_OMIT_FRAME_POINTER
  45         def_bool y
  46
  47 config GENERIC_CSUM
  48         def_bool y
  49
  50 config RWSEM_GENERIC_SPINLOCK
  51         def_bool y
  52
  53 config ARCH_FLATMEM_ENABLE
  54         def_bool y
  55
  56 config MMU
  57         def_bool y
  58
  59 config NO_IOPORT
  60         def_bool y
  61
  62 config GENERIC_CALIBRATE_DELAY
  63         def_bool y
  64
  65 config GENERIC_HWEIGHT
  66         def_bool y
  67
  68 config STACKTRACE_SUPPORT
  69         def_bool y
  70         select STACKTRACE
  71
  72 config HAVE_LATENCYTOP_SUPPORT
  73         def_bool y
  74
  75 config NO_DMA
  76         def_bool n
  77
  78 source "init/Kconfig"
  79 source "kernel/Kconfig.freezer"
  80
  81 menu "ARC Architecture Configuration"
  82
  83 menu "ARC Platform/SoC/Board"
  84
  85 source "arch/arc/plat-arcfpga/Kconfig"
  86 source "arch/arc/plat-tb10x/Kconfig"
  87 #New platform adds here
  88
  89 endmenu
  90
  91 menu "ARC CPU Configuration"
  92
  93 choice
  94         prompt "ARC Core"
  95         default ARC_CPU_770
  96
  97 config ARC_CPU_750D
  98         bool "ARC750D"
  99         help
 100           Support for ARC750 core
 101
 102 config ARC_CPU_770
 103         bool "ARC770"
 104         select ARC_CPU_REL_4_10
 105         help
 106           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 107           This core has a bunch of cool new features:
 108           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
 109                    Shared Address Spaces (for sharing TLB entires in MMU)
 110           -Caches: New Prog Model, Region Flush
 111           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
 112
 113 endchoice
 114
 115 config CPU_BIG_ENDIAN
 116         bool "Enable Big Endian Mode"
 117         default n
 118         help
 119           Build kernel for Big Endian Mode of ARC CPU
 120
 121 # If a platform can't work with 0x8000_0000 based dma_addr_t
 122 config ARC_PLAT_NEEDS_CPU_TO_DMA
 123         bool
 124
 125 config SMP
 126         bool "Symmetric Multi-Processing (Incomplete)"
 127         default n
 128         select USE_GENERIC_SMP_HELPERS
 129         help
 130           This enables support for systems with more than one CPU. If you have
 131           a system with only one CPU, like most personal computers, say N. If
 132           you have a system with more than one CPU, say Y.
 133
 134 if SMP
 135
 136 config ARC_HAS_COH_CACHES
 137         def_bool n
 138
 139 config ARC_HAS_COH_RTSC
 140         def_bool n
 141
 142 config ARC_HAS_REENTRANT_IRQ_LV2
 143         def_bool n
 144
 145 endif
 146
 147 config NR_CPUS
 148         int "Maximum number of CPUs (2-32)"
 149         range 2 32
 150         depends on SMP
 151         default "2"
 152
 153 menuconfig ARC_CACHE
 154         bool "Enable Cache Support"
 155         default y
 156         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
 157         depends on !SMP || ARC_HAS_COH_CACHES
 158
 159 if ARC_CACHE
 160
 161 config ARC_CACHE_LINE_SHIFT
 162         int "Cache Line Length (as power of 2)"
 163         range 5 7
 164         default "6"
 165         help
 166           Starting with ARC700 4.9, Cache line length is configurable,
 167           This option specifies "N", with Line-len = 2 power N
 168           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
 169           Linux only supports same line lengths for I and D caches.
 170
 171 config ARC_HAS_ICACHE
 172         bool "Use Instruction Cache"
 173         default y
 174
 175 config ARC_HAS_DCACHE
 176         bool "Use Data Cache"
 177         default y
 178
 179 config ARC_CACHE_PAGES
 180         bool "Per Page Cache Control"
 181         default y
 182         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
 183         help
 184           This can be used to over-ride the global I/D Cache Enable on a
 185           per-page basis (but only for pages accessed via MMU such as
 186           Kernel Virtual address or User Virtual Address)
 187           TLB entries have a per-page Cache Enable Bit.
 188           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
 189           Global DISABLE + Per Page ENABLE won't work
 190
 191 config ARC_CACHE_VIPT_ALIASING
 192         bool "Support VIPT Aliasing D$"
 193         depends on ARC_HAS_DCACHE
 194         default n
 195
 196 endif   #ARC_CACHE
 197
 198 config ARC_HAS_ICCM
 199         bool "Use ICCM"
 200         help
 201           Single Cycle RAMS to store Fast Path Code
 202         default n
 203
 204 config ARC_ICCM_SZ
 205         int "ICCM Size in KB"
 206         default "64"
 207         depends on ARC_HAS_ICCM
 208
 209 config ARC_HAS_DCCM
 210         bool "Use DCCM"
 211         help
 212           Single Cycle RAMS to store Fast Path Data
 213         default n
 214
 215 config ARC_DCCM_SZ
 216         int "DCCM Size in KB"
 217         default "64"
 218         depends on ARC_HAS_DCCM
 219
 220 config ARC_DCCM_BASE
 221         hex "DCCM map address"
 222         default "0xA0000000"
 223         depends on ARC_HAS_DCCM
 224
 225 config ARC_HAS_HW_MPY
 226         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 227         default y
 228         help
 229           Influences how gcc generates code for MPY operations.
 230           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 231           Multipler. Otherwise software multipy lib is used
 232
 233 choice
 234         prompt "ARC700 MMU Version"
 235         default ARC_MMU_V3 if ARC_CPU_770
 236         default ARC_MMU_V2 if ARC_CPU_750D
 237
 238 config ARC_MMU_V1
 239         bool "MMU v1"
 240         help
 241           Orig ARC700 MMU
 242
 243 config ARC_MMU_V2
 244         bool "MMU v2"
 245         help
 246           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 247           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 248
 249 config ARC_MMU_V3
 250         bool "MMU v3"
 251         depends on ARC_CPU_770
 252         help
 253           Introduced with ARC700 4.10: New Features
 254           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 255           Shared Address Spaces (SASID)
 256
 257 endchoice
 258
 259
 260 choice
 261         prompt "MMU Page Size"
 262         default ARC_PAGE_SIZE_8K
 263
 264 config ARC_PAGE_SIZE_8K
 265         bool "8KB"
 266         help
 267           Choose between 8k vs 16k
 268
 269 config ARC_PAGE_SIZE_16K
 270         bool "16KB"
 271         depends on ARC_MMU_V3
 272
 273 config ARC_PAGE_SIZE_4K
 274         bool "4KB"
 275         depends on ARC_MMU_V3
 276
 277 endchoice
 278
 279 config ARC_COMPACT_IRQ_LEVELS
 280         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 281         default n
 282         # Timer HAS to be high priority, for any other high priority config
 283         select ARC_IRQ3_LV2
 284         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 285         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 286
 287 if ARC_COMPACT_IRQ_LEVELS
 288
 289 config ARC_IRQ3_LV2
 290         bool
 291
 292 config ARC_IRQ5_LV2
 293         bool
 294
 295 config ARC_IRQ6_LV2
 296         bool
 297
 298 endif
 299
 300 config ARC_FPU_SAVE_RESTORE
 301         bool "Enable FPU state persistence across context switch"
 302         default n
 303         help
 304           Double Precision Floating Point unit had dedictaed regs which
 305           need to be saved/restored across context-switch.
 306           Note that ARC FPU is overly simplistic, unlike say x86, which has
 307           hardware pieces to allow software to conditionally save/restore,
 308           based on actual usage of FPU by a task. Thus our implemn does
 309           this for all tasks in system.
 310
 311 config ARC_CANT_LLSC
 312         def_bool n
 313
 314 menuconfig ARC_CPU_REL_4_10
 315         bool "Enable support for Rel 4.10 features"
 316         default n
 317         help
 318           -ARC770 (and dependent features) enabled
 319           -ARC750 also shares some of the new features with 770
 320
 321 config ARC_HAS_LLSC
 322         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 323         default y
 324         depends on ARC_CPU_770 && !ARC_CANT_LLSC
 325
 326 config ARC_HAS_SWAPE
 327         bool "Insn: SWAPE (endian-swap)"
 328         default y
 329         depends on ARC_CPU_REL_4_10
 330
 331 config ARC_HAS_RTSC
 332         bool "Insn: RTSC (64-bit r/o cycle counter)"
 333         default y
 334         depends on ARC_CPU_REL_4_10
 335         # if SMP, enable RTSC only if counter is coherent across cores
 336         depends on !SMP || ARC_HAS_COH_RTSC
 337
 338 endmenu   # "ARC CPU Configuration"
 339
 340 config LINUX_LINK_BASE
 341         hex "Linux Link Address"
 342         default "0x80000000"
 343         help
 344           ARC700 divides the 32 bit phy address space into two equal halves
 345           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 346           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 347           Typically Linux kernel is linked at the start of untransalted addr,
 348           hence the default value of 0x8zs.
 349           However some customers have peripherals mapped at this addr, so
 350           Linux needs to be scooted a bit.
 351           If you don't know what the above means, leave this setting alone.
 352
 353 config ARC_CURR_IN_REG
 354         bool "Dedicate Register r25 for current_task pointer"
 355         default y
 356         help
 357           This reserved Register R25 to point to Current Task in
 358           kernel mode. This saves memory access for each such access
 359
 360
 361 config ARC_MISALIGN_ACCESS
 362         bool "Emulate unaligned memory access (userspace only)"
 363         default N
 364         select SYSCTL_ARCH_UNALIGN_NO_WARN
 365         select SYSCTL_ARCH_UNALIGN_ALLOW
 366         help
 367           This enables misaligned 16 & 32 bit memory access from user space.
 368           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 369           potential bugs in code
 370
 371 config HZ
 372         int "Timer Frequency"
 373         default 100
 374
 375 config ARC_METAWARE_HLINK
 376         bool "Support for Metaware debugger assisted Host access"
 377         default n
 378         help
 379           This options allows a Linux userland apps to directly access
 380           host file system (open/creat/read/write etc) with help from
 381           Metaware Debugger. This can come in handy for Linux-host communication
 382           when there is no real usable peripheral such as EMAC.
 383
 384 menuconfig ARC_DBG
 385         bool "ARC debugging"
 386         default y
 387
 388 config ARC_DW2_UNWIND
 389         bool "Enable DWARF specific kernel stack unwind"
 390         depends on ARC_DBG
 391         default y
 392         select KALLSYMS
 393         help
 394           Compiles the kernel with DWARF unwind information and can be used
 395           to get stack backtraces.
 396
 397           If you say Y here the resulting kernel image will be slightly larger
 398           but not slower, and it will give very useful debugging information.
 399           If you don't debug the kernel, you can say N, but we may not be able
 400           to solve problems without frame unwind information
 401
 402 config ARC_DBG_TLB_PARANOIA
 403         bool "Paranoia Checks in Low Level TLB Handlers"
 404         depends on ARC_DBG
 405         default n
 406
 407 config ARC_DBG_TLB_MISS_COUNT
 408         bool "Profile TLB Misses"
 409         default n
 410         select DEBUG_FS
 411         depends on ARC_DBG
 412         help
 413           Counts number of I and D TLB Misses and exports them via Debugfs
 414           The counters can be cleared via Debugfs as well
 415
 416 config CMDLINE_UBOOT
 417         bool "Support U-boot kernel command line passing"
 418         default n
 419         help
 420           If you are using U-boot (www.denx.de) and wish to pass the kernel
 421           command line from the U-boot environment to the Linux kernel then
 422           switch this option on.
 423           ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
 424           to it. kernel startup code will append this to DeviceTree
 425           /bootargs provided cmdline args.
 426
 427 config ARC_BUILTIN_DTB_NAME
 428         string "Built in DTB"
 429         help
 430           Set the name of the DTB to embed in the vmlinux binary
 431           Leaving it blank selects the minimal "skeleton" dtb
 432
 433 source "kernel/Kconfig.preempt"
 434
 435 menu "Executable file formats"
 436 source "fs/Kconfig.binfmt"
 437 endmenu
 438
 439 endmenu  # "ARC Architecture Configuration"
 440
 441 source "mm/Kconfig"
 442 source "net/Kconfig"
 443 source "drivers/Kconfig"
 444 source "fs/Kconfig"
 445 source "arch/arc/Kconfig.debug"
 446 source "security/Kconfig"
 447 source "crypto/Kconfig"
 448 source "lib/Kconfig"