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 BUILDTIME_EXTABLE_SORT
  12         select COMMON_CLK
  13         select CLONE_BACKWARDS
  14         # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
  15         select DEVTMPFS if !INITRAMFS_SOURCE=""
  16         select GENERIC_ATOMIC64
  17         select GENERIC_CLOCKEVENTS
  18         select GENERIC_FIND_FIRST_BIT
  19         # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
  20         select GENERIC_IRQ_SHOW
  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_IOREMAP_PROT
  26         select HAVE_KPROBES
  27         select HAVE_KRETPROBES
  28         select HAVE_MEMBLOCK
  29         select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
  30         select HAVE_OPROFILE
  31         select HAVE_PERF_EVENTS
  32         select IRQ_DOMAIN
  33         select MODULES_USE_ELF_RELA
  34         select NO_BOOTMEM
  35         select OF
  36         select OF_EARLY_FLATTREE
  37         select PERF_USE_VMALLOC
  38         select HAVE_DEBUG_STACKOVERFLOW
  39
  40 config TRACE_IRQFLAGS_SUPPORT
  41         def_bool y
  42
  43 config LOCKDEP_SUPPORT
  44         def_bool y
  45
  46 config SCHED_OMIT_FRAME_POINTER
  47         def_bool y
  48
  49 config GENERIC_CSUM
  50         def_bool y
  51
  52 config RWSEM_GENERIC_SPINLOCK
  53         def_bool y
  54
  55 config ARCH_FLATMEM_ENABLE
  56         def_bool y
  57
  58 config MMU
  59         def_bool y
  60
  61 config NO_IOPORT_MAP
  62         def_bool y
  63
  64 config GENERIC_CALIBRATE_DELAY
  65         def_bool y
  66
  67 config GENERIC_HWEIGHT
  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 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-sim/Kconfig"
  85 source "arch/arc/plat-tb10x/Kconfig"
  86 source "arch/arc/plat-axs10x/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_HAS_SWAPE
 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 config SMP
 122         bool "Symmetric Multi-Processing (Incomplete)"
 123         default n
 124         help
 125           This enables support for systems with more than one CPU. If you have
 126           a system with only one CPU, say N. If you have a system with more
 127           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_REENTRANT_IRQ_LV2
 135         def_bool n
 136
 137 endif
 138
 139 config NR_CPUS
 140         int "Maximum number of CPUs (2-4096)"
 141         range 2 4096
 142         depends on SMP
 143         default "2"
 144
 145 menuconfig ARC_CACHE
 146         bool "Enable Cache Support"
 147         default y
 148         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
 149         depends on !SMP || ARC_HAS_COH_CACHES
 150
 151 if ARC_CACHE
 152
 153 config ARC_CACHE_LINE_SHIFT
 154         int "Cache Line Length (as power of 2)"
 155         range 5 7
 156         default "6"
 157         help
 158           Starting with ARC700 4.9, Cache line length is configurable,
 159           This option specifies "N", with Line-len = 2 power N
 160           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
 161           Linux only supports same line lengths for I and D caches.
 162
 163 config ARC_HAS_ICACHE
 164         bool "Use Instruction Cache"
 165         default y
 166
 167 config ARC_HAS_DCACHE
 168         bool "Use Data Cache"
 169         default y
 170
 171 config ARC_CACHE_PAGES
 172         bool "Per Page Cache Control"
 173         default y
 174         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
 175         help
 176           This can be used to over-ride the global I/D Cache Enable on a
 177           per-page basis (but only for pages accessed via MMU such as
 178           Kernel Virtual address or User Virtual Address)
 179           TLB entries have a per-page Cache Enable Bit.
 180           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
 181           Global DISABLE + Per Page ENABLE won't work
 182
 183 config ARC_CACHE_VIPT_ALIASING
 184         bool "Support VIPT Aliasing D$"
 185         depends on ARC_HAS_DCACHE
 186         default n
 187
 188 endif   #ARC_CACHE
 189
 190 config ARC_HAS_ICCM
 191         bool "Use ICCM"
 192         help
 193           Single Cycle RAMS to store Fast Path Code
 194         default n
 195
 196 config ARC_ICCM_SZ
 197         int "ICCM Size in KB"
 198         default "64"
 199         depends on ARC_HAS_ICCM
 200
 201 config ARC_HAS_DCCM
 202         bool "Use DCCM"
 203         help
 204           Single Cycle RAMS to store Fast Path Data
 205         default n
 206
 207 config ARC_DCCM_SZ
 208         int "DCCM Size in KB"
 209         default "64"
 210         depends on ARC_HAS_DCCM
 211
 212 config ARC_DCCM_BASE
 213         hex "DCCM map address"
 214         default "0xA0000000"
 215         depends on ARC_HAS_DCCM
 216
 217 config ARC_HAS_HW_MPY
 218         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 219         default y
 220         help
 221           Influences how gcc generates code for MPY operations.
 222           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 223           Multipler. Otherwise software multipy lib is used
 224
 225 choice
 226         prompt "ARC700 MMU Version"
 227         default ARC_MMU_V3 if ARC_CPU_770
 228         default ARC_MMU_V2 if ARC_CPU_750D
 229
 230 config ARC_MMU_V1
 231         bool "MMU v1"
 232         help
 233           Orig ARC700 MMU
 234
 235 config ARC_MMU_V2
 236         bool "MMU v2"
 237         help
 238           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 239           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 240
 241 config ARC_MMU_V3
 242         bool "MMU v3"
 243         depends on ARC_CPU_770
 244         help
 245           Introduced with ARC700 4.10: New Features
 246           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 247           Shared Address Spaces (SASID)
 248
 249 endchoice
 250
 251
 252 choice
 253         prompt "MMU Page Size"
 254         default ARC_PAGE_SIZE_8K
 255
 256 config ARC_PAGE_SIZE_8K
 257         bool "8KB"
 258         help
 259           Choose between 8k vs 16k
 260
 261 config ARC_PAGE_SIZE_16K
 262         bool "16KB"
 263         depends on ARC_MMU_V3
 264
 265 config ARC_PAGE_SIZE_4K
 266         bool "4KB"
 267         depends on ARC_MMU_V3
 268
 269 endchoice
 270
 271 config ARC_COMPACT_IRQ_LEVELS
 272         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 273         default n
 274         # Timer HAS to be high priority, for any other high priority config
 275         select ARC_IRQ3_LV2
 276         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 277         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 278
 279 if ARC_COMPACT_IRQ_LEVELS
 280
 281 config ARC_IRQ3_LV2
 282         bool
 283
 284 config ARC_IRQ5_LV2
 285         bool
 286
 287 config ARC_IRQ6_LV2
 288         bool
 289
 290 endif
 291
 292 config ARC_FPU_SAVE_RESTORE
 293         bool "Enable FPU state persistence across context switch"
 294         default n
 295         help
 296           Double Precision Floating Point unit had dedictaed regs which
 297           need to be saved/restored across context-switch.
 298           Note that ARC FPU is overly simplistic, unlike say x86, which has
 299           hardware pieces to allow software to conditionally save/restore,
 300           based on actual usage of FPU by a task. Thus our implemn does
 301           this for all tasks in system.
 302
 303 config ARC_CANT_LLSC
 304         def_bool n
 305
 306 config ARC_HAS_LLSC
 307         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 308         default y
 309         depends on ARC_CPU_770 && !ARC_CANT_LLSC
 310
 311 config ARC_HAS_SWAPE
 312         bool "Insn: SWAPE (endian-swap)"
 313         default y
 314
 315 endmenu   # "ARC CPU Configuration"
 316
 317 config LINUX_LINK_BASE
 318         hex "Linux Link Address"
 319         default "0x80000000"
 320         help
 321           ARC700 divides the 32 bit phy address space into two equal halves
 322           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 323           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 324           Typically Linux kernel is linked at the start of untransalted addr,
 325           hence the default value of 0x8zs.
 326           However some customers have peripherals mapped at this addr, so
 327           Linux needs to be scooted a bit.
 328           If you don't know what the above means, leave this setting alone.
 329
 330 config ARC_CURR_IN_REG
 331         bool "Dedicate Register r25 for current_task pointer"
 332         default y
 333         help
 334           This reserved Register R25 to point to Current Task in
 335           kernel mode. This saves memory access for each such access
 336
 337
 338 config ARC_EMUL_UNALIGNED
 339         bool "Emulate unaligned memory access (userspace only)"
 340         select SYSCTL_ARCH_UNALIGN_NO_WARN
 341         select SYSCTL_ARCH_UNALIGN_ALLOW
 342         help
 343           This enables misaligned 16 & 32 bit memory access from user space.
 344           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 345           potential bugs in code
 346
 347 config HZ
 348         int "Timer Frequency"
 349         default 100
 350
 351 config ARC_METAWARE_HLINK
 352         bool "Support for Metaware debugger assisted Host access"
 353         default n
 354         help
 355           This options allows a Linux userland apps to directly access
 356           host file system (open/creat/read/write etc) with help from
 357           Metaware Debugger. This can come in handy for Linux-host communication
 358           when there is no real usable peripheral such as EMAC.
 359
 360 menuconfig ARC_DBG
 361         bool "ARC debugging"
 362         default y
 363
 364 config ARC_DW2_UNWIND
 365         bool "Enable DWARF specific kernel stack unwind"
 366         depends on ARC_DBG
 367         default y
 368         select KALLSYMS
 369         help
 370           Compiles the kernel with DWARF unwind information and can be used
 371           to get stack backtraces.
 372
 373           If you say Y here the resulting kernel image will be slightly larger
 374           but not slower, and it will give very useful debugging information.
 375           If you don't debug the kernel, you can say N, but we may not be able
 376           to solve problems without frame unwind information
 377
 378 config ARC_DBG_TLB_PARANOIA
 379         bool "Paranoia Checks in Low Level TLB Handlers"
 380         depends on ARC_DBG
 381         default n
 382
 383 config ARC_DBG_TLB_MISS_COUNT
 384         bool "Profile TLB Misses"
 385         default n
 386         select DEBUG_FS
 387         depends on ARC_DBG
 388         help
 389           Counts number of I and D TLB Misses and exports them via Debugfs
 390           The counters can be cleared via Debugfs as well
 391
 392 config ARC_UBOOT_SUPPORT
 393         bool "Support uboot arg Handling"
 394         default n
 395         help
 396           ARC Linux by default checks for uboot provided args as pointers to
 397           external cmdline or DTB. This however breaks in absence of uboot,
 398           when booting from Metaware debugger directly, as the registers are
 399           not zeroed out on reset by mdb and/or ARCv2 based cores. The bogus
 400           registers look like uboot args to kernel which then chokes.
 401           So only enable the uboot arg checking/processing if users are sure
 402           of uboot being in play.
 403
 404 config ARC_BUILTIN_DTB_NAME
 405         string "Built in DTB"
 406         help
 407           Set the name of the DTB to embed in the vmlinux binary
 408           Leaving it blank selects the minimal "skeleton" dtb
 409
 410 source "kernel/Kconfig.preempt"
 411
 412 menu "Executable file formats"
 413 source "fs/Kconfig.binfmt"
 414 endmenu
 415
 416 endmenu  # "ARC Architecture Configuration"
 417
 418 source "mm/Kconfig"
 419 source "net/Kconfig"
 420 source "drivers/Kconfig"
 421 source "fs/Kconfig"
 422 source "arch/arc/Kconfig.debug"
 423 source "security/Kconfig"
 424 source "crypto/Kconfig"
 425 source "lib/Kconfig"
 426 source "kernel/power/Kconfig"