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 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 source "arch/arc/plat-tb10x/Kconfig"
  89 #New platform adds here
  90
  91 endmenu
  92
  93 menu "ARC CPU Configuration"
  94
  95 choice
  96         prompt "ARC Core"
  97         default ARC_CPU_770
  98
  99 config ARC_CPU_750D
 100         bool "ARC750D"
 101         help
 102           Support for ARC750 core
 103
 104 config ARC_CPU_770
 105         bool "ARC770"
 106         select ARC_CPU_REL_4_10
 107         help
 108           Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
 109           This core has a bunch of cool new features:
 110           -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
 111                    Shared Address Spaces (for sharing TLB entires in MMU)
 112           -Caches: New Prog Model, Region Flush
 113           -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
 114
 115 endchoice
 116
 117 config CPU_BIG_ENDIAN
 118         bool "Enable Big Endian Mode"
 119         default n
 120         help
 121           Build kernel for Big Endian Mode of ARC CPU
 122
 123 # If a platform can't work with 0x8000_0000 based dma_addr_t
 124 config ARC_PLAT_NEEDS_CPU_TO_DMA
 125         bool
 126
 127 config SMP
 128         bool "Symmetric Multi-Processing (Incomplete)"
 129         default n
 130         help
 131           This enables support for systems with more than one CPU. If you have
 132           a system with only one CPU, say N. If you have a system with more
 133           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_REENTRANT_IRQ_LV2
 141         def_bool n
 142
 143 endif
 144
 145 config NR_CPUS
 146         int "Maximum number of CPUs (2-4096)"
 147         range 2 4096
 148         depends on SMP
 149         default "2"
 150
 151 menuconfig ARC_CACHE
 152         bool "Enable Cache Support"
 153         default y
 154         # if SMP, cache enabled ONLY if ARC implementation has cache coherency
 155         depends on !SMP || ARC_HAS_COH_CACHES
 156
 157 if ARC_CACHE
 158
 159 config ARC_CACHE_LINE_SHIFT
 160         int "Cache Line Length (as power of 2)"
 161         range 5 7
 162         default "6"
 163         help
 164           Starting with ARC700 4.9, Cache line length is configurable,
 165           This option specifies "N", with Line-len = 2 power N
 166           So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
 167           Linux only supports same line lengths for I and D caches.
 168
 169 config ARC_HAS_ICACHE
 170         bool "Use Instruction Cache"
 171         default y
 172
 173 config ARC_HAS_DCACHE
 174         bool "Use Data Cache"
 175         default y
 176
 177 config ARC_CACHE_PAGES
 178         bool "Per Page Cache Control"
 179         default y
 180         depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
 181         help
 182           This can be used to over-ride the global I/D Cache Enable on a
 183           per-page basis (but only for pages accessed via MMU such as
 184           Kernel Virtual address or User Virtual Address)
 185           TLB entries have a per-page Cache Enable Bit.
 186           Note that Global I/D ENABLE + Per Page DISABLE works but corollary
 187           Global DISABLE + Per Page ENABLE won't work
 188
 189 config ARC_CACHE_VIPT_ALIASING
 190         bool "Support VIPT Aliasing D$"
 191         depends on ARC_HAS_DCACHE
 192         default n
 193
 194 endif   #ARC_CACHE
 195
 196 config ARC_HAS_ICCM
 197         bool "Use ICCM"
 198         help
 199           Single Cycle RAMS to store Fast Path Code
 200         default n
 201
 202 config ARC_ICCM_SZ
 203         int "ICCM Size in KB"
 204         default "64"
 205         depends on ARC_HAS_ICCM
 206
 207 config ARC_HAS_DCCM
 208         bool "Use DCCM"
 209         help
 210           Single Cycle RAMS to store Fast Path Data
 211         default n
 212
 213 config ARC_DCCM_SZ
 214         int "DCCM Size in KB"
 215         default "64"
 216         depends on ARC_HAS_DCCM
 217
 218 config ARC_DCCM_BASE
 219         hex "DCCM map address"
 220         default "0xA0000000"
 221         depends on ARC_HAS_DCCM
 222
 223 config ARC_HAS_HW_MPY
 224         bool "Use Hardware Multiplier (Normal or Faster XMAC)"
 225         default y
 226         help
 227           Influences how gcc generates code for MPY operations.
 228           If enabled, MPYxx insns are generated, provided by Standard/XMAC
 229           Multipler. Otherwise software multipy lib is used
 230
 231 choice
 232         prompt "ARC700 MMU Version"
 233         default ARC_MMU_V3 if ARC_CPU_770
 234         default ARC_MMU_V2 if ARC_CPU_750D
 235
 236 config ARC_MMU_V1
 237         bool "MMU v1"
 238         help
 239           Orig ARC700 MMU
 240
 241 config ARC_MMU_V2
 242         bool "MMU v2"
 243         help
 244           Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
 245           when 2 D-TLB and 1 I-TLB entries index into same 2way set.
 246
 247 config ARC_MMU_V3
 248         bool "MMU v3"
 249         depends on ARC_CPU_770
 250         help
 251           Introduced with ARC700 4.10: New Features
 252           Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
 253           Shared Address Spaces (SASID)
 254
 255 endchoice
 256
 257
 258 choice
 259         prompt "MMU Page Size"
 260         default ARC_PAGE_SIZE_8K
 261
 262 config ARC_PAGE_SIZE_8K
 263         bool "8KB"
 264         help
 265           Choose between 8k vs 16k
 266
 267 config ARC_PAGE_SIZE_16K
 268         bool "16KB"
 269         depends on ARC_MMU_V3
 270
 271 config ARC_PAGE_SIZE_4K
 272         bool "4KB"
 273         depends on ARC_MMU_V3
 274
 275 endchoice
 276
 277 config ARC_COMPACT_IRQ_LEVELS
 278         bool "ARCompact IRQ Priorities: High(2)/Low(1)"
 279         default n
 280         # Timer HAS to be high priority, for any other high priority config
 281         select ARC_IRQ3_LV2
 282         # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
 283         depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
 284
 285 if ARC_COMPACT_IRQ_LEVELS
 286
 287 config ARC_IRQ3_LV2
 288         bool
 289
 290 config ARC_IRQ5_LV2
 291         bool
 292
 293 config ARC_IRQ6_LV2
 294         bool
 295
 296 endif
 297
 298 config ARC_FPU_SAVE_RESTORE
 299         bool "Enable FPU state persistence across context switch"
 300         default n
 301         help
 302           Double Precision Floating Point unit had dedictaed regs which
 303           need to be saved/restored across context-switch.
 304           Note that ARC FPU is overly simplistic, unlike say x86, which has
 305           hardware pieces to allow software to conditionally save/restore,
 306           based on actual usage of FPU by a task. Thus our implemn does
 307           this for all tasks in system.
 308
 309 config ARC_CANT_LLSC
 310         def_bool n
 311
 312 menuconfig ARC_CPU_REL_4_10
 313         bool "Enable support for Rel 4.10 features"
 314         default n
 315         help
 316           -ARC770 (and dependent features) enabled
 317           -ARC750 also shares some of the new features with 770
 318
 319 config ARC_HAS_LLSC
 320         bool "Insn: LLOCK/SCOND (efficient atomic ops)"
 321         default y
 322         depends on ARC_CPU_770 && !ARC_CANT_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         depends on !SMP
 334
 335 endmenu   # "ARC CPU Configuration"
 336
 337 config LINUX_LINK_BASE
 338         hex "Linux Link Address"
 339         default "0x80000000"
 340         help
 341           ARC700 divides the 32 bit phy address space into two equal halves
 342           -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
 343           -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
 344           Typically Linux kernel is linked at the start of untransalted addr,
 345           hence the default value of 0x8zs.
 346           However some customers have peripherals mapped at this addr, so
 347           Linux needs to be scooted a bit.
 348           If you don't know what the above means, leave this setting alone.
 349
 350 config ARC_CURR_IN_REG
 351         bool "Dedicate Register r25 for current_task pointer"
 352         default y
 353         help
 354           This reserved Register R25 to point to Current Task in
 355           kernel mode. This saves memory access for each such access
 356
 357
 358 config ARC_MISALIGN_ACCESS
 359         bool "Emulate unaligned memory access (userspace only)"
 360         select SYSCTL_ARCH_UNALIGN_NO_WARN
 361         select SYSCTL_ARCH_UNALIGN_ALLOW
 362         help
 363           This enables misaligned 16 & 32 bit memory access from user space.
 364           Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
 365           potential bugs in code
 366
 367 config HZ
 368         int "Timer Frequency"
 369         default 100
 370
 371 config ARC_METAWARE_HLINK
 372         bool "Support for Metaware debugger assisted Host access"
 373         default n
 374         help
 375           This options allows a Linux userland apps to directly access
 376           host file system (open/creat/read/write etc) with help from
 377           Metaware Debugger. This can come in handy for Linux-host communication
 378           when there is no real usable peripheral such as EMAC.
 379
 380 menuconfig ARC_DBG
 381         bool "ARC debugging"
 382         default y
 383
 384 config ARC_DW2_UNWIND
 385         bool "Enable DWARF specific kernel stack unwind"
 386         depends on ARC_DBG
 387         default y
 388         select KALLSYMS
 389         help
 390           Compiles the kernel with DWARF unwind information and can be used
 391           to get stack backtraces.
 392
 393           If you say Y here the resulting kernel image will be slightly larger
 394           but not slower, and it will give very useful debugging information.
 395           If you don't debug the kernel, you can say N, but we may not be able
 396           to solve problems without frame unwind information
 397
 398 config ARC_DBG_TLB_PARANOIA
 399         bool "Paranoia Checks in Low Level TLB Handlers"
 400         depends on ARC_DBG
 401         default n
 402
 403 config ARC_DBG_TLB_MISS_COUNT
 404         bool "Profile TLB Misses"
 405         default n
 406         select DEBUG_FS
 407         depends on ARC_DBG
 408         help
 409           Counts number of I and D TLB Misses and exports them via Debugfs
 410           The counters can be cleared via Debugfs as well
 411
 412 config ARC_BUILTIN_DTB_NAME
 413         string "Built in DTB"
 414         help
 415           Set the name of the DTB to embed in the vmlinux binary
 416           Leaving it blank selects the minimal "skeleton" dtb
 417
 418 source "kernel/Kconfig.preempt"
 419
 420 menu "Executable file formats"
 421 source "fs/Kconfig.binfmt"
 422 endmenu
 423
 424 endmenu  # "ARC Architecture Configuration"
 425
 426 source "mm/Kconfig"
 427 source "net/Kconfig"
 428 source "drivers/Kconfig"
 429 source "fs/Kconfig"
 430 source "arch/arc/Kconfig.debug"
 431 source "security/Kconfig"
 432 source "crypto/Kconfig"
 433 source "lib/Kconfig"