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_KGDB
  26         select HAVE_ARCH_TRACEHOOK
  27         select HAVE_GENERIC_HARDIRQS
  28         select HAVE_IOREMAP_PROT
  29         select HAVE_IRQ_WORK
  30         select HAVE_KPROBES
  31         select HAVE_KRETPROBES
  32         select HAVE_MEMBLOCK
  33         select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
  34         select HAVE_OPROFILE
  35         select HAVE_PERF_EVENTS
  36         select IRQ_DOMAIN
  37         select MODULES_USE_ELF_RELA
  38         select NO_BOOTMEM
  39         select OF
  40         select OF_EARLY_FLATTREE
  41         select PERF_USE_VMALLOC
  42
  43 config SCHED_OMIT_FRAME_POINTER
  44         def_bool y
  45
  46 config GENERIC_CSUM
  47         def_bool y
  48
  49 config RWSEM_GENERIC_SPINLOCK
  50         def_bool y
  51
  52 config ARCH_FLATMEM_ENABLE
  53         def_bool y
  54
  55 config MMU
  56         def_bool y
  57
  58 config NO_IOPORT
  59         def_bool y
  60
  61 config GENERIC_CALIBRATE_DELAY
  62         def_bool y
  63
  64 config GENERIC_HWEIGHT
  65         def_bool y
  66
  67 config BINFMT_ELF
  68         def_bool y
  69
  70 config STACKTRACE_SUPPORT
  71         def_bool y
  72         select STACKTRACE
  73
  74 config HAVE_LATENCYTOP_SUPPORT
  75         def_bool y
  76
  77 config NO_DMA
  78         def_bool n
  79
  80 source "init/Kconfig"
  81 source "kernel/Kconfig.freezer"
  82
  83 menu "ARC Architecture Configuration"
  84
  85 menu "ARC Platform/SoC/Board"
  86
  87 source "arch/arc/plat-arcfpga/Kconfig"
  88 #New platform adds here
  89
  90 endmenu
  91
  92 menu "ARC CPU Configuration"
  93
  94 choice
  95         prompt "ARC Core"
  96         default ARC_CPU_770
  97
  98 config ARC_CPU_750D
  99         bool "ARC750D"
 100         help
 101           Support for ARC750 core
 102
 103 config ARC_CPU_770
 104         bool "ARC770"
 105         select ARC_CPU_REL_4_10
 106         help
 107           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 108           This core has a bunch of cool new features:
 109           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
 110                    Shared Address Spaces (for sharing TLB entires in MMU)
 111           -Caches: New Prog Model, Region Flush
 112           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
 113
 114 endchoice
 115
 116 config CPU_BIG_ENDIAN
 117         bool "Enable Big Endian Mode"
 118         default n
 119         help
 120           Build kernel for Big Endian Mode of ARC CPU
 121
 122 # If a platform can't work with 0x8000_0000 based dma_addr_t
 123 config ARC_PLAT_NEEDS_CPU_TO_DMA
 124         bool
 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_ICCM
 198         bool "Use ICCM"
 199         help
 200           Single Cycle RAMS to store Fast Path Code
 201         default n
 202
 203 config ARC_ICCM_SZ
 204         int "ICCM Size in KB"
 205         default "64"
 206         depends on ARC_HAS_ICCM
 207
 208 config ARC_HAS_DCCM
 209         bool "Use DCCM"
 210         help
 211           Single Cycle RAMS to store Fast Path Data
 212         default n
 213
 214 config ARC_DCCM_SZ
 215         int "DCCM Size in KB"
 216         default "64"
 217         depends on ARC_HAS_DCCM
 218
 219 config ARC_DCCM_BASE
 220         hex "DCCM map address"
 221         default "0xA0000000"
 222         depends on ARC_HAS_DCCM
 223
 224 config ARC_HAS_HW_MPY
 225         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 226         default y
 227         help
 228           Influences how gcc generates code for MPY operations.
 229           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 230           Multipler. Otherwise software multipy lib is used
 231
 232 choice
 233         prompt "ARC700 MMU Version"
 234         default ARC_MMU_V3 if ARC_CPU_770
 235         default ARC_MMU_V2 if ARC_CPU_750D
 236
 237 config ARC_MMU_V1
 238         bool "MMU v1"
 239         help
 240           Orig ARC700 MMU
 241
 242 config ARC_MMU_V2
 243         bool "MMU v2"
 244         help
 245           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 246           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 247
 248 config ARC_MMU_V3
 249         bool "MMU v3"
 250         depends on ARC_CPU_770
 251         help
 252           Introduced with ARC700 4.10: New Features
 253           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 254           Shared Address Spaces (SASID)
 255
 256 endchoice
 257
 258
 259 choice
 260         prompt "MMU Page Size"
 261         default ARC_PAGE_SIZE_8K
 262
 263 config ARC_PAGE_SIZE_8K
 264         bool "8KB"
 265         help
 266           Choose between 8k vs 16k
 267
 268 config ARC_PAGE_SIZE_16K
 269         bool "16KB"
 270         depends on ARC_MMU_V3
 271
 272 config ARC_PAGE_SIZE_4K
 273         bool "4KB"
 274         depends on ARC_MMU_V3
 275
 276 endchoice
 277
 278 config ARC_COMPACT_IRQ_LEVELS
 279         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 280         default n
 281         # Timer HAS to be high priority, for any other high priority config
 282         select ARC_IRQ3_LV2
 283         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 284         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 285
 286 if ARC_COMPACT_IRQ_LEVELS
 287
 288 config ARC_IRQ3_LV2
 289         bool
 290
 291 config ARC_IRQ5_LV2
 292         bool
 293
 294 config ARC_IRQ6_LV2
 295         bool
 296
 297 endif
 298
 299 config ARC_FPU_SAVE_RESTORE
 300         bool "Enable FPU state persistence across context switch"
 301         default n
 302         help
 303           Double Precision Floating Point unit had dedictaed regs which
 304           need to be saved/restored across context-switch.
 305           Note that ARC FPU is overly simplistic, unlike say x86, which has
 306           hardware pieces to allow software to conditionally save/restore,
 307           based on actual usage of FPU by a task. Thus our implemn does
 308           this for all tasks in system.
 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
 321         # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
 322         depends on !SMP || ARC_HAS_COH_LLSC
 323
 324 config ARC_HAS_SWAPE
 325         bool "Insn: SWAPE (endian-swap)"
 326         default y
 327         depends on ARC_CPU_REL_4_10
 328
 329 config ARC_HAS_RTSC
 330         bool "Insn: RTSC (64-bit r/o cycle counter)"
 331         default y
 332         depends on ARC_CPU_REL_4_10
 333         # if SMP, enable RTSC only if counter is coherent across cores
 334         depends on !SMP || ARC_HAS_COH_RTSC
 335
 336 endmenu   # "ARC CPU Configuration"
 337
 338 config LINUX_LINK_BASE
 339         hex "Linux Link Address"
 340         default "0x80000000"
 341         help
 342           ARC700 divides the 32 bit phy address space into two equal halves
 343           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 344           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 345           Typically Linux kernel is linked at the start of untransalted addr,
 346           hence the default value of 0x8zs.
 347           However some customers have peripherals mapped at this addr, so
 348           Linux needs to be scooted a bit.
 349           If you don't know what the above means, leave this setting alone.
 350
 351 config ARC_CURR_IN_REG
 352         bool "Dedicate Register r25 for current_task pointer"
 353         default y
 354         help
 355           This reserved Register R25 to point to Current Task in
 356           kernel mode. This saves memory access for each such access
 357
 358
 359 config ARC_MISALIGN_ACCESS
 360         bool "Emulate unaligned memory access (userspace only)"
 361         default N
 362         select SYSCTL_ARCH_UNALIGN_NO_WARN
 363         select SYSCTL_ARCH_UNALIGN_ALLOW
 364         help
 365           This enables misaligned 16 & 32 bit memory access from user space.
 366           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 367           potential bugs in code
 368
 369 config ARC_STACK_NONEXEC
 370         bool "Make stack non-executable"
 371         default n
 372         help
 373           To disable the execute permissions of stack/heap of processes
 374           which are enabled by default.
 375
 376 config HZ
 377         int "Timer Frequency"
 378         default 100
 379
 380 config ARC_METAWARE_HLINK
 381         bool "Support for Metaware debugger assisted Host access"
 382         default n
 383         help
 384           This options allows a Linux userland apps to directly access
 385           host file system (open/creat/read/write etc) with help from
 386           Metaware Debugger. This can come in handy for Linux-host communication
 387           when there is no real usable peripheral such as EMAC.
 388
 389 menuconfig ARC_DBG
 390         bool "ARC debugging"
 391         default y
 392
 393 config ARC_DW2_UNWIND
 394         bool "Enable DWARF specific kernel stack unwind"
 395         depends on ARC_DBG
 396         default y
 397         select KALLSYMS
 398         help
 399           Compiles the kernel with DWARF unwind information and can be used
 400           to get stack backtraces.
 401
 402           If you say Y here the resulting kernel image will be slightly larger
 403           but not slower, and it will give very useful debugging information.
 404           If you don't debug the kernel, you can say N, but we may not be able
 405           to solve problems without frame unwind information
 406
 407 config ARC_DBG_TLB_PARANOIA
 408         bool "Paranoia Checks in Low Level TLB Handlers"
 409         depends on ARC_DBG
 410         default n
 411
 412 config ARC_DBG_TLB_MISS_COUNT
 413         bool "Profile TLB Misses"
 414         default n
 415         select DEBUG_FS
 416         depends on ARC_DBG
 417         help
 418           Counts number of I and D TLB Misses and exports them via Debugfs
 419           The counters can be cleared via Debugfs as well
 420
 421 config CMDLINE
 422         string "Kernel command line to built-in"
 423         default "print-fatal-signals=1"
 424         help
 425           The default command line which will be appended to the optional
 426           u-boot provided command line (see below)
 427
 428 config CMDLINE_UBOOT
 429         bool "Support U-boot kernel command line passing"
 430         default n
 431         help
 432           If you are using U-boot (www.denx.de) and wish to pass the kernel
 433           command line from the U-boot environment to the Linux kernel then
 434           switch this option on.
 435           ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
 436           to it. kernel startup code will copy the string into cmdline buffer
 437           and also append CONFIG_CMDLINE.
 438
 439 config ARC_BUILTIN_DTB_NAME
 440         string "Built in DTB"
 441         help
 442           Set the name of the DTB to embed in the vmlinux binary
 443           Leaving it blank selects the minimal "skeleton" dtb
 444
 445 source "kernel/Kconfig.preempt"
 446
 447 endmenu  # "ARC Architecture Configuration"
 448
 449 source "mm/Kconfig"
 450 source "net/Kconfig"
 451 source "drivers/Kconfig"
 452 source "fs/Kconfig"
 453 source "arch/arc/Kconfig.debug"
 454 source "security/Kconfig"
 455 source "crypto/Kconfig"
 456 source "lib/Kconfig"