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 ARCH_NO_VIRT_TO_BUS
  12         select CLONE_BACKWARDS
  13         # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
  14         select DEVTMPFS if !INITRAMFS_SOURCE=""
  15         select GENERIC_ATOMIC64
  16         select GENERIC_CLOCKEVENTS
  17         select GENERIC_FIND_FIRST_BIT
  18         # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
  19         select GENERIC_IRQ_SHOW
  20         select GENERIC_KERNEL_EXECVE
  21         select GENERIC_KERNEL_THREAD
  22         select GENERIC_PENDING_IRQ if SMP
  23         select GENERIC_SIGALTSTACK
  24         select GENERIC_SMP_IDLE_THREAD
  25         select HAVE_ARCH_TRACEHOOK
  26         select HAVE_GENERIC_HARDIRQS
  27         select HAVE_KPROBES
  28         select HAVE_KRETPROBES
  29         select HAVE_MEMBLOCK
  30         select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
  31         select HAVE_OPROFILE
  32         select IRQ_DOMAIN
  33         select MODULES_USE_ELF_RELA
  34         select NO_BOOTMEM
  35         select OF
  36         select OF_EARLY_FLATTREE
  37
  38 config SCHED_OMIT_FRAME_POINTER
  39         def_bool y
  40
  41 config GENERIC_CSUM
  42         def_bool y
  43
  44 config RWSEM_GENERIC_SPINLOCK
  45         def_bool y
  46
  47 config ARCH_FLATMEM_ENABLE
  48         def_bool y
  49
  50 config MMU
  51         def_bool y
  52
  53 config NO_IOPORT
  54         def_bool y
  55
  56 config GENERIC_CALIBRATE_DELAY
  57         def_bool y
  58
  59 config GENERIC_HWEIGHT
  60         def_bool y
  61
  62 config BINFMT_ELF
  63         def_bool y
  64
  65 config STACKTRACE_SUPPORT
  66         def_bool y
  67         select STACKTRACE
  68
  69 config HAVE_LATENCYTOP_SUPPORT
  70         def_bool y
  71
  72 config NO_DMA
  73         def_bool n
  74
  75 source "init/Kconfig"
  76 source "kernel/Kconfig.freezer"
  77
  78 menu "ARC Architecture Configuration"
  79
  80 choice
  81         prompt "ARC Platform"
  82         default ARC_PLAT_FPGA_LEGACY
  83
  84 config ARC_PLAT_FPGA_LEGACY
  85         bool "\"Legacy\" ARC FPGA dev platform"
  86         help
  87           Support for ARC development platforms, provided by Synopsys.
  88           These are based on FPGA or ISS. e.g.
  89           - ARCAngel4
  90           - ML509
  91           - MetaWare ISS
  92
  93 #New platform adds here
  94 endchoice
  95
  96 menu "ARC CPU Configuration"
  97
  98 choice
  99         prompt "ARC Core"
 100         default ARC_CPU_770
 101
 102 config ARC_CPU_750D
 103         bool "ARC750D"
 104         help
 105           Support for ARC750 core
 106
 107 config ARC_CPU_770
 108         bool "ARC770"
 109         select ARC_CPU_REL_4_10
 110         help
 111           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 112           This core has a bunch of cool new features:
 113           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
 114                    Shared Address Spaces (for sharing TLB entires in MMU)
 115           -Caches: New Prog Model, Region Flush
 116           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
 117
 118 endchoice
 119
 120 config CPU_BIG_ENDIAN
 121         bool "Enable Big Endian Mode"
 122         default n
 123         help
 124           Build kernel for Big Endian Mode of ARC CPU
 125
 126 config SMP
 127         bool "Symmetric Multi-Processing (Incomplete)"
 128         default n
 129         select USE_GENERIC_SMP_HELPERS
 130         help
 131           This enables support for systems with more than one CPU. If you have
 132           a system with only one CPU, like most personal computers, say N. If
 133           you have a system with more than one CPU, say Y.
 134
 135 if SMP
 136
 137 config ARC_HAS_COH_CACHES
 138         def_bool n
 139
 140 config ARC_HAS_COH_LLSC
 141         def_bool n
 142
 143 config ARC_HAS_COH_RTSC
 144         def_bool n
 145
 146 config ARC_HAS_REENTRANT_IRQ_LV2
 147         def_bool n
 148
 149 endif
 150
 151 config NR_CPUS
 152         int "Maximum number of CPUs (2-32)"
 153         range 2 32
 154         depends on SMP
 155         default "2"
 156
 157 menuconfig ARC_CACHE
 158         bool "Enable Cache Support"
 159         default y
 160         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
 161         depends on !SMP || ARC_HAS_COH_CACHES
 162
 163 if ARC_CACHE
 164
 165 config ARC_CACHE_LINE_SHIFT
 166         int "Cache Line Length (as power of 2)"
 167         range 5 7
 168         default "6"
 169         help
 170           Starting with ARC700 4.9, Cache line length is configurable,
 171           This option specifies "N", with Line-len = 2 power N
 172           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
 173           Linux only supports same line lengths for I and D caches.
 174
 175 config ARC_HAS_ICACHE
 176         bool "Use Instruction Cache"
 177         default y
 178
 179 config ARC_HAS_DCACHE
 180         bool "Use Data Cache"
 181         default y
 182
 183 config ARC_CACHE_PAGES
 184         bool "Per Page Cache Control"
 185         default y
 186         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
 187         help
 188           This can be used to over-ride the global I/D Cache Enable on a
 189           per-page basis (but only for pages accessed via MMU such as
 190           Kernel Virtual address or User Virtual Address)
 191           TLB entries have a per-page Cache Enable Bit.
 192           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
 193           Global DISABLE + Per Page ENABLE won't work
 194
 195 endif   #ARC_CACHE
 196
 197 config ARC_HAS_HW_MPY
 198         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 199         default y
 200         help
 201           Influences how gcc generates code for MPY operations.
 202           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 203           Multipler. Otherwise software multipy lib is used
 204
 205 choice
 206         prompt "ARC700 MMU Version"
 207         default ARC_MMU_V3 if ARC_CPU_770
 208         default ARC_MMU_V2 if ARC_CPU_750D
 209
 210 config ARC_MMU_V1
 211         bool "MMU v1"
 212         help
 213           Orig ARC700 MMU
 214
 215 config ARC_MMU_V2
 216         bool "MMU v2"
 217         help
 218           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 219           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 220
 221 config ARC_MMU_V3
 222         bool "MMU v3"
 223         depends on ARC_CPU_770
 224         help
 225           Introduced with ARC700 4.10: New Features
 226           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 227           Shared Address Spaces (SASID)
 228
 229 endchoice
 230
 231
 232 choice
 233         prompt "MMU Page Size"
 234         default ARC_PAGE_SIZE_8K
 235
 236 config ARC_PAGE_SIZE_8K
 237         bool "8KB"
 238         help
 239           Choose between 8k vs 16k
 240
 241 config ARC_PAGE_SIZE_16K
 242         bool "16KB"
 243         depends on ARC_MMU_V3
 244
 245 config ARC_PAGE_SIZE_4K
 246         bool "4KB"
 247         depends on ARC_MMU_V3
 248
 249 endchoice
 250
 251 config ARC_COMPACT_IRQ_LEVELS
 252         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 253         default n
 254         # Timer HAS to be high priority, for any other high priority config
 255         select ARC_IRQ3_LV2
 256         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 257         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 258
 259 if ARC_COMPACT_IRQ_LEVELS
 260
 261 config ARC_IRQ3_LV2
 262         bool
 263
 264 config ARC_IRQ5_LV2
 265         bool
 266
 267 config ARC_IRQ6_LV2
 268         bool
 269
 270 endif
 271
 272 config ARC_FPU_SAVE_RESTORE
 273         bool "Enable FPU state persistence across context switch"
 274         default n
 275         help
 276           Double Precision Floating Point unit had dedictaed regs which
 277           need to be saved/restored across context-switch.
 278           Note that ARC FPU is overly simplistic, unlike say x86, which has
 279           hardware pieces to allow software to conditionally save/restore,
 280           based on actual usage of FPU by a task. Thus our implemn does
 281           this for all tasks in system.
 282
 283 menuconfig ARC_CPU_REL_4_10
 284         bool "Enable support for Rel 4.10 features"
 285         default n
 286         help
 287           -ARC770 (and dependent features) enabled
 288           -ARC750 also shares some of the new features with 770
 289
 290 config ARC_HAS_LLSC
 291         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 292         default y
 293         depends on ARC_CPU_770
 294         # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
 295         depends on !SMP || ARC_HAS_COH_LLSC
 296
 297 config ARC_HAS_SWAPE
 298         bool "Insn: SWAPE (endian-swap)"
 299         default y
 300         depends on ARC_CPU_REL_4_10
 301
 302 config ARC_HAS_RTSC
 303         bool "Insn: RTSC (64-bit r/o cycle counter)"
 304         default y
 305         depends on ARC_CPU_REL_4_10
 306         # if SMP, enable RTSC only if counter is coherent across cores
 307         depends on !SMP || ARC_HAS_COH_RTSC
 308
 309 endmenu   # "ARC CPU Configuration"
 310
 311 menu "Platform Board Configuration"
 312
 313 source "arch/arc/plat-arcfpga/Kconfig"
 314
 315 #New platform adds here
 316
 317 config LINUX_LINK_BASE
 318         hex "Linux Link Address"
 319         default "0x80000000"
 320         help
 321           ARC700 divides the 32 bit phy address space into two equal halves
 322           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 323           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 324           Typically Linux kernel is linked at the start of untransalted addr,
 325           hence the default value of 0x8zs.
 326           However some customers have peripherals mapped at this addr, so
 327           Linux needs to be scooted a bit.
 328           If you don't know what the above means, leave this setting alone.
 329
 330 endmenu # "Platform Board Configuration"
 331
 332 config ARC_CURR_IN_REG
 333         bool "Dedicate Register r25 for current_task pointer"
 334         default y
 335         help
 336           This reserved Register R25 to point to Current Task in
 337           kernel mode. This saves memory access for each such access
 338
 339
 340 config ARC_MISALIGN_ACCESS
 341         bool "Emulate unaligned memory access (userspace only)"
 342         default N
 343         select SYSCTL_ARCH_UNALIGN_NO_WARN
 344         select SYSCTL_ARCH_UNALIGN_ALLOW
 345         help
 346           This enables misaligned 16 & 32 bit memory access from user space.
 347           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 348           potential bugs in code
 349
 350 config ARC_STACK_NONEXEC
 351         bool "Make stack non-executable"
 352         default n
 353         help
 354           To disable the execute permissions of stack/heap of processes
 355           which are enabled by default.
 356
 357 config HZ
 358         int "Timer Frequency"
 359         default 100
 360
 361 menuconfig ARC_DBG
 362         bool "ARC debugging"
 363         default y
 364
 365 config ARC_DW2_UNWIND
 366         bool "Enable DWARF specific kernel stack unwind"
 367         depends on ARC_DBG
 368         default y
 369         select KALLSYMS
 370         help
 371           Compiles the kernel with DWARF unwind information and can be used
 372           to get stack backtraces.
 373
 374           If you say Y here the resulting kernel image will be slightly larger
 375           but not slower, and it will give very useful debugging information.
 376           If you don't debug the kernel, you can say N, but we may not be able
 377           to solve problems without frame unwind information
 378
 379 config ARC_DBG_TLB_PARANOIA
 380         bool "Paranoia Checks in Low Level TLB Handlers"
 381         depends on ARC_DBG && !SMP
 382         default n
 383
 384 config ARC_DBG_TLB_MISS_COUNT
 385         bool "Profile TLB Misses"
 386         default n
 387         select DEBUG_FS
 388         depends on ARC_DBG
 389         help
 390           Counts number of I and D TLB Misses and exports them via Debugfs
 391           The counters can be cleared via Debugfs as well
 392
 393 config CMDLINE
 394         string "Kernel command line to built-in"
 395         default "print-fatal-signals=1"
 396         help
 397           The default command line which will be appended to the optional
 398           u-boot provided command line (see below)
 399
 400 config CMDLINE_UBOOT
 401         bool "Support U-boot kernel command line passing"
 402         default n
 403         help
 404           If you are using U-boot (www.denx.de) and wish to pass the kernel
 405           command line from the U-boot environment to the Linux kernel then
 406           switch this option on.
 407           ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
 408           to it. kernel startup code will copy the string into cmdline buffer
 409           and also append CONFIG_CMDLINE.
 410
 411 config ARC_BUILTIN_DTB_NAME
 412         string "Built in DTB"
 413         help
 414           Set the name of the DTB to embed in the vmlinux binary
 415           Leaving it blank selects the minimal "skeleton" dtb
 416
 417 source "kernel/Kconfig.preempt"
 418
 419 endmenu  # "ARC Architecture Configuration"
 420
 421 source "mm/Kconfig"
 422 source "net/Kconfig"
 423 source "drivers/Kconfig"
 424 source "fs/Kconfig"
 425 source "arch/arc/Kconfig.debug"
 426 source "security/Kconfig"
 427 source "crypto/Kconfig"
 428 source "lib/Kconfig"