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         help
 129           This enables support for systems with more than one CPU. If you have
 130           a system with only one CPU, like most personal computers, say N. If
 131           you have a system with more than one CPU, say Y.
 132
 133 if SMP
 134
 135 config ARC_HAS_COH_CACHES
 136         def_bool n
 137
 138 config ARC_HAS_REENTRANT_IRQ_LV2
 139         def_bool n
 140
 141 endif
 142
 143 config NR_CPUS
 144         int "Maximum number of CPUs (2-4096)"
 145         range 2 4096
 146         depends on SMP
 147         default "2"
 148
 149 menuconfig ARC_CACHE
 150         bool "Enable Cache Support"
 151         default y
 152         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
 153         depends on !SMP || ARC_HAS_COH_CACHES
 154
 155 if ARC_CACHE
 156
 157 config ARC_CACHE_LINE_SHIFT
 158         int "Cache Line Length (as power of 2)"
 159         range 5 7
 160         default "6"
 161         help
 162           Starting with ARC700 4.9, Cache line length is configurable,
 163           This option specifies "N", with Line-len = 2 power N
 164           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
 165           Linux only supports same line lengths for I and D caches.
 166
 167 config ARC_HAS_ICACHE
 168         bool "Use Instruction Cache"
 169         default y
 170
 171 config ARC_HAS_DCACHE
 172         bool "Use Data Cache"
 173         default y
 174
 175 config ARC_CACHE_PAGES
 176         bool "Per Page Cache Control"
 177         default y
 178         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
 179         help
 180           This can be used to over-ride the global I/D Cache Enable on a
 181           per-page basis (but only for pages accessed via MMU such as
 182           Kernel Virtual address or User Virtual Address)
 183           TLB entries have a per-page Cache Enable Bit.
 184           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
 185           Global DISABLE + Per Page ENABLE won't work
 186
 187 config ARC_CACHE_VIPT_ALIASING
 188         bool "Support VIPT Aliasing D$"
 189         depends on ARC_HAS_DCACHE
 190         default n
 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 config ARC_CANT_LLSC
 308         def_bool n
 309
 310 menuconfig ARC_CPU_REL_4_10
 311         bool "Enable support for Rel 4.10 features"
 312         default n
 313         help
 314           -ARC770 (and dependent features) enabled
 315           -ARC750 also shares some of the new features with 770
 316
 317 config ARC_HAS_LLSC
 318         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 319         default y
 320         depends on ARC_CPU_770 && !ARC_CANT_LLSC
 321
 322 config ARC_HAS_SWAPE
 323         bool "Insn: SWAPE (endian-swap)"
 324         default y
 325         depends on ARC_CPU_REL_4_10
 326
 327 config ARC_HAS_RTSC
 328         bool "Insn: RTSC (64-bit r/o cycle counter)"
 329         default y
 330         depends on ARC_CPU_REL_4_10
 331         depends on !SMP
 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 HZ
 367         int "Timer Frequency"
 368         default 100
 369
 370 config ARC_METAWARE_HLINK
 371         bool "Support for Metaware debugger assisted Host access"
 372         default n
 373         help
 374           This options allows a Linux userland apps to directly access
 375           host file system (open/creat/read/write etc) with help from
 376           Metaware Debugger. This can come in handy for Linux-host communication
 377           when there is no real usable peripheral such as EMAC.
 378
 379 menuconfig ARC_DBG
 380         bool "ARC debugging"
 381         default y
 382
 383 config ARC_DW2_UNWIND
 384         bool "Enable DWARF specific kernel stack unwind"
 385         depends on ARC_DBG
 386         default y
 387         select KALLSYMS
 388         help
 389           Compiles the kernel with DWARF unwind information and can be used
 390           to get stack backtraces.
 391
 392           If you say Y here the resulting kernel image will be slightly larger
 393           but not slower, and it will give very useful debugging information.
 394           If you don't debug the kernel, you can say N, but we may not be able
 395           to solve problems without frame unwind information
 396
 397 config ARC_DBG_TLB_PARANOIA
 398         bool "Paranoia Checks in Low Level TLB Handlers"
 399         depends on ARC_DBG
 400         default n
 401
 402 config ARC_DBG_TLB_MISS_COUNT
 403         bool "Profile TLB Misses"
 404         default n
 405         select DEBUG_FS
 406         depends on ARC_DBG
 407         help
 408           Counts number of I and D TLB Misses and exports them via Debugfs
 409           The counters can be cleared via Debugfs as well
 410
 411 config CMDLINE_UBOOT
 412         bool "Support U-boot kernel command line passing"
 413         default n
 414         help
 415           If you are using U-boot (www.denx.de) and wish to pass the kernel
 416           command line from the U-boot environment to the Linux kernel then
 417           switch this option on.
 418           ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
 419           to it. kernel startup code will append this to DeviceTree
 420           /bootargs provided cmdline args.
 421
 422 config ARC_BUILTIN_DTB_NAME
 423         string "Built in DTB"
 424         help
 425           Set the name of the DTB to embed in the vmlinux binary
 426           Leaving it blank selects the minimal "skeleton" dtb
 427
 428 source "kernel/Kconfig.preempt"
 429
 430 menu "Executable file formats"
 431 source "fs/Kconfig.binfmt"
 432 endmenu
 433
 434 endmenu  # "ARC Architecture Configuration"
 435
 436 source "mm/Kconfig"
 437 source "net/Kconfig"
 438 source "drivers/Kconfig"
 439 source "fs/Kconfig"
 440 source "arch/arc/Kconfig.debug"
 441 source "security/Kconfig"
 442 source "crypto/Kconfig"
 443 source "lib/Kconfig"