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