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