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-arcfpga/Kconfig"
  85 source "arch/arc/plat-tb10x/Kconfig"
  86 #New platform adds here
  87
  88 endmenu
  89
  90 menu "ARC CPU Configuration"
  91
  92 choice
  93         prompt "ARC Core"
  94         default ARC_CPU_770
  95
  96 config ARC_CPU_750D
  97         bool "ARC750D"
  98         help
  99           Support for ARC750 core
 100
 101 config ARC_CPU_770
 102         bool "ARC770"
 103         select ARC_CPU_REL_4_10
 104         help
 105           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 106           This core has a bunch of cool new features:
 107           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
 108                    Shared Address Spaces (for sharing TLB entires in MMU)
 109           -Caches: New Prog Model, Region Flush
 110           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
 111
 112 endchoice
 113
 114 config CPU_BIG_ENDIAN
 115         bool "Enable Big Endian Mode"
 116         default n
 117         help
 118           Build kernel for Big Endian Mode of ARC CPU
 119
 120 # If a platform can't work with 0x8000_0000 based dma_addr_t
 121 config ARC_PLAT_NEEDS_CPU_TO_DMA
 122         bool
 123
 124 config SMP
 125         bool "Symmetric Multi-Processing (Incomplete)"
 126         default n
 127         help
 128           This enables support for systems with more than one CPU. If you have
 129           a system with only one CPU, say N. If you have a system with more
 130           than one CPU, say Y.
 131
 132 if SMP
 133
 134 config ARC_HAS_COH_CACHES
 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 (2-4096)"
 144         range 2 4096
 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 config ARC_CACHE_VIPT_ALIASING
 187         bool "Support VIPT Aliasing D$"
 188         depends on ARC_HAS_DCACHE
 189         default n
 190
 191 endif   #ARC_CACHE
 192
 193 config ARC_HAS_ICCM
 194         bool "Use ICCM"
 195         help
 196           Single Cycle RAMS to store Fast Path Code
 197         default n
 198
 199 config ARC_ICCM_SZ
 200         int "ICCM Size in KB"
 201         default "64"
 202         depends on ARC_HAS_ICCM
 203
 204 config ARC_HAS_DCCM
 205         bool "Use DCCM"
 206         help
 207           Single Cycle RAMS to store Fast Path Data
 208         default n
 209
 210 config ARC_DCCM_SZ
 211         int "DCCM Size in KB"
 212         default "64"
 213         depends on ARC_HAS_DCCM
 214
 215 config ARC_DCCM_BASE
 216         hex "DCCM map address"
 217         default "0xA0000000"
 218         depends on ARC_HAS_DCCM
 219
 220 config ARC_HAS_HW_MPY
 221         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 222         default y
 223         help
 224           Influences how gcc generates code for MPY operations.
 225           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 226           Multipler. Otherwise software multipy lib is used
 227
 228 choice
 229         prompt "ARC700 MMU Version"
 230         default ARC_MMU_V3 if ARC_CPU_770
 231         default ARC_MMU_V2 if ARC_CPU_750D
 232
 233 config ARC_MMU_V1
 234         bool "MMU v1"
 235         help
 236           Orig ARC700 MMU
 237
 238 config ARC_MMU_V2
 239         bool "MMU v2"
 240         help
 241           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 242           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 243
 244 config ARC_MMU_V3
 245         bool "MMU v3"
 246         depends on ARC_CPU_770
 247         help
 248           Introduced with ARC700 4.10: New Features
 249           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 250           Shared Address Spaces (SASID)
 251
 252 endchoice
 253
 254
 255 choice
 256         prompt "MMU Page Size"
 257         default ARC_PAGE_SIZE_8K
 258
 259 config ARC_PAGE_SIZE_8K
 260         bool "8KB"
 261         help
 262           Choose between 8k vs 16k
 263
 264 config ARC_PAGE_SIZE_16K
 265         bool "16KB"
 266         depends on ARC_MMU_V3
 267
 268 config ARC_PAGE_SIZE_4K
 269         bool "4KB"
 270         depends on ARC_MMU_V3
 271
 272 endchoice
 273
 274 config ARC_COMPACT_IRQ_LEVELS
 275         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 276         default n
 277         # Timer HAS to be high priority, for any other high priority config
 278         select ARC_IRQ3_LV2
 279         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 280         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 281
 282 if ARC_COMPACT_IRQ_LEVELS
 283
 284 config ARC_IRQ3_LV2
 285         bool
 286
 287 config ARC_IRQ5_LV2
 288         bool
 289
 290 config ARC_IRQ6_LV2
 291         bool
 292
 293 endif
 294
 295 config ARC_FPU_SAVE_RESTORE
 296         bool "Enable FPU state persistence across context switch"
 297         default n
 298         help
 299           Double Precision Floating Point unit had dedictaed regs which
 300           need to be saved/restored across context-switch.
 301           Note that ARC FPU is overly simplistic, unlike say x86, which has
 302           hardware pieces to allow software to conditionally save/restore,
 303           based on actual usage of FPU by a task. Thus our implemn does
 304           this for all tasks in system.
 305
 306 config ARC_CANT_LLSC
 307         def_bool n
 308
 309 menuconfig ARC_CPU_REL_4_10
 310         bool "Enable support for Rel 4.10 features"
 311         default n
 312         help
 313           -ARC770 (and dependent features) enabled
 314           -ARC750 also shares some of the new features with 770
 315
 316 config ARC_HAS_LLSC
 317         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 318         default y
 319         depends on ARC_CPU_770 && !ARC_CANT_LLSC
 320
 321 config ARC_HAS_SWAPE
 322         bool "Insn: SWAPE (endian-swap)"
 323         default y
 324         depends on ARC_CPU_REL_4_10
 325
 326 config ARC_HAS_RTSC
 327         bool "Insn: RTSC (64-bit r/o cycle counter)"
 328         default y
 329         depends on ARC_CPU_REL_4_10
 330         depends on !SMP
 331
 332 endmenu   # "ARC CPU Configuration"
 333
 334 config LINUX_LINK_BASE
 335         hex "Linux Link Address"
 336         default "0x80000000"
 337         help
 338           ARC700 divides the 32 bit phy address space into two equal halves
 339           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 340           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 341           Typically Linux kernel is linked at the start of untransalted addr,
 342           hence the default value of 0x8zs.
 343           However some customers have peripherals mapped at this addr, so
 344           Linux needs to be scooted a bit.
 345           If you don't know what the above means, leave this setting alone.
 346
 347 config ARC_CURR_IN_REG
 348         bool "Dedicate Register r25 for current_task pointer"
 349         default y
 350         help
 351           This reserved Register R25 to point to Current Task in
 352           kernel mode. This saves memory access for each such access
 353
 354
 355 config ARC_EMUL_UNALIGNED
 356         bool "Emulate unaligned memory access (userspace only)"
 357         select SYSCTL_ARCH_UNALIGN_NO_WARN
 358         select SYSCTL_ARCH_UNALIGN_ALLOW
 359         help
 360           This enables misaligned 16 & 32 bit memory access from user space.
 361           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 362           potential bugs in code
 363
 364 config HZ
 365         int "Timer Frequency"
 366         default 100
 367
 368 config ARC_METAWARE_HLINK
 369         bool "Support for Metaware debugger assisted Host access"
 370         default n
 371         help
 372           This options allows a Linux userland apps to directly access
 373           host file system (open/creat/read/write etc) with help from
 374           Metaware Debugger. This can come in handy for Linux-host communication
 375           when there is no real usable peripheral such as EMAC.
 376
 377 menuconfig ARC_DBG
 378         bool "ARC debugging"
 379         default y
 380
 381 config ARC_DW2_UNWIND
 382         bool "Enable DWARF specific kernel stack unwind"
 383         depends on ARC_DBG
 384         default y
 385         select KALLSYMS
 386         help
 387           Compiles the kernel with DWARF unwind information and can be used
 388           to get stack backtraces.
 389
 390           If you say Y here the resulting kernel image will be slightly larger
 391           but not slower, and it will give very useful debugging information.
 392           If you don't debug the kernel, you can say N, but we may not be able
 393           to solve problems without frame unwind information
 394
 395 config ARC_DBG_TLB_PARANOIA
 396         bool "Paranoia Checks in Low Level TLB Handlers"
 397         depends on ARC_DBG
 398         default n
 399
 400 config ARC_DBG_TLB_MISS_COUNT
 401         bool "Profile TLB Misses"
 402         default n
 403         select DEBUG_FS
 404         depends on ARC_DBG
 405         help
 406           Counts number of I and D TLB Misses and exports them via Debugfs
 407           The counters can be cleared via Debugfs as well
 408
 409 config ARC_BUILTIN_DTB_NAME
 410         string "Built in DTB"
 411         help
 412           Set the name of the DTB to embed in the vmlinux binary
 413           Leaving it blank selects the minimal "skeleton" dtb
 414
 415 source "kernel/Kconfig.preempt"
 416
 417 menu "Executable file formats"
 418 source "fs/Kconfig.binfmt"
 419 endmenu
 420
 421 endmenu  # "ARC Architecture Configuration"
 422
 423 source "mm/Kconfig"
 424 source "net/Kconfig"
 425 source "drivers/Kconfig"
 426 source "fs/Kconfig"
 427 source "arch/arc/Kconfig.debug"
 428 source "security/Kconfig"
 429 source "crypto/Kconfig"
 430 source "lib/Kconfig"