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