arch/tile/Kconfig

   1 # For a description of the syntax of this configuration file,
   2 # see Documentation/kbuild/kconfig-language.txt.
   3
   4 config TILE
   5         def_bool y
   6         select HAVE_KVM if !TILEGX
   7         select GENERIC_FIND_FIRST_BIT
   8         select USE_GENERIC_SMP_HELPERS
   9         select CC_OPTIMIZE_FOR_SIZE
  10         select HAVE_GENERIC_HARDIRQS
  11         select GENERIC_IRQ_PROBE
  12         select GENERIC_PENDING_IRQ if SMP
  13         select GENERIC_IRQ_SHOW
  14         select SYS_HYPERVISOR
  15         select ARCH_HAVE_NMI_SAFE_CMPXCHG if !M386
  16
  17 # FIXME: investigate whether we need/want these options.
  18 #       select HAVE_IOREMAP_PROT
  19 #       select HAVE_OPTPROBES
  20 #       select HAVE_REGS_AND_STACK_ACCESS_API
  21 #       select HAVE_HW_BREAKPOINT
  22 #       select PERF_EVENTS
  23 #       select HAVE_USER_RETURN_NOTIFIER
  24 #       config NO_BOOTMEM
  25 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  26 #       config HUGETLB_PAGE_SIZE_VARIABLE
  27
  28 config MMU
  29         def_bool y
  30
  31 config GENERIC_CSUM
  32         def_bool y
  33
  34 config SEMAPHORE_SLEEPERS
  35         def_bool y
  36
  37 config HAVE_ARCH_ALLOC_REMAP
  38         def_bool y
  39
  40 config HAVE_SETUP_PER_CPU_AREA
  41         def_bool y
  42
  43 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  44         def_bool y
  45
  46 config SYS_SUPPORTS_HUGETLBFS
  47         def_bool y
  48
  49 config GENERIC_CLOCKEVENTS
  50         def_bool y
  51
  52 # FIXME: tilegx can implement a more efficient rwsem.
  53 config RWSEM_GENERIC_SPINLOCK
  54         def_bool y
  55
  56 # We have a very flat architecture from a migration point of view,
  57 # so save boot time by presetting this (particularly useful on tile-sim).
  58 config DEFAULT_MIGRATION_COST
  59         int
  60         default "10000000"
  61
  62 # We only support gcc 4.4 and above, so this should work.
  63 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  64         def_bool y
  65
  66 config ARCH_PHYS_ADDR_T_64BIT
  67         def_bool y
  68
  69 config ARCH_DMA_ADDR_T_64BIT
  70         def_bool y
  71
  72 config LOCKDEP_SUPPORT
  73         def_bool y
  74
  75 config STACKTRACE_SUPPORT
  76         def_bool y
  77         select STACKTRACE
  78
  79 # We use discontigmem for now; at some point we may want to switch
  80 # to sparsemem (Tilera bug 7996).
  81 config ARCH_DISCONTIGMEM_ENABLE
  82         def_bool y
  83
  84 config ARCH_DISCONTIGMEM_DEFAULT
  85         def_bool y
  86
  87 config TRACE_IRQFLAGS_SUPPORT
  88         def_bool y
  89
  90 config STRICT_DEVMEM
  91         def_bool y
  92
  93 # SMP is required for Tilera Linux.
  94 config SMP
  95         def_bool y
  96
  97 # Allow checking for compile-time determined overflow errors in
  98 # copy_from_user().  There are still unprovable places in the
  99 # generic code as of 2.6.34, so this option is not really compatible
 100 # with -Werror, which is more useful in general.
 101 config DEBUG_COPY_FROM_USER
 102         def_bool n
 103
 104 config HVC_TILE
 105         select HVC_DRIVER
 106         def_bool y
 107
 108 # Please note: TILE-Gx support is not yet finalized; this is
 109 # the preliminary support.  TILE-Gx drivers are only provided
 110 # with the alpha or beta test versions for Tilera customers.
 111 config TILEGX
 112         depends on EXPERIMENTAL
 113         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 114
 115 config 64BIT
 116         depends on TILEGX
 117         def_bool y
 118
 119 config ARCH_DEFCONFIG
 120         string
 121         default "arch/tile/configs/tile_defconfig" if !TILEGX
 122         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 123
 124 source "init/Kconfig"
 125
 126 menu "Tilera-specific configuration"
 127
 128 config NR_CPUS
 129         int "Maximum number of tiles (2-255)"
 130         range 2 255
 131         depends on SMP
 132         default "64"
 133         ---help---
 134           Building with 64 is the recommended value, but a slightly
 135           smaller kernel memory footprint results from using a smaller
 136           value on chips with fewer tiles.
 137
 138 source "kernel/time/Kconfig"
 139
 140 source "kernel/Kconfig.hz"
 141
 142 config KEXEC
 143         bool "kexec system call"
 144         ---help---
 145           kexec is a system call that implements the ability to shutdown your
 146           current kernel, and to start another kernel.  It is like a reboot
 147           but it is independent of the system firmware.   It is used
 148           to implement the "mboot" Tilera booter.
 149
 150           The name comes from the similarity to the exec system call.
 151
 152 config COMPAT
 153         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 154         depends on TILEGX
 155         select COMPAT_BINFMT_ELF
 156         default y
 157         ---help---
 158           If enabled, the kernel will support running TILE-Gx binaries
 159           that were built with the -m32 option.
 160
 161 config SYSVIPC_COMPAT
 162         def_bool y
 163         depends on COMPAT && SYSVIPC
 164
 165 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 166 config HIGHMEM
 167         bool # "Support for more than 512 MB of RAM"
 168         default !TILEGX
 169         ---help---
 170           Linux can use the full amount of RAM in the system by
 171           default.  However, the address space of TILE processors is
 172           only 4 Gigabytes large. That means that, if you have a large
 173           amount of physical memory, not all of it can be "permanently
 174           mapped" by the kernel. The physical memory that's not
 175           permanently mapped is called "high memory".
 176
 177           If you are compiling a kernel which will never run on a
 178           machine with more than 512 MB total physical RAM, answer
 179           "false" here. This will result in the kernel mapping all of
 180           physical memory into the top 1 GB of virtual memory space.
 181
 182           If unsure, say "true".
 183
 184 # We do not currently support disabling NUMA.
 185 config NUMA
 186         bool # "NUMA Memory Allocation and Scheduler Support"
 187         depends on SMP && DISCONTIGMEM
 188         default y
 189         ---help---
 190           NUMA memory allocation is required for TILE processors
 191           unless booting with memory striping enabled in the
 192           hypervisor, or with only a single memory controller.
 193           It is recommended that this option always be enabled.
 194
 195 config NODES_SHIFT
 196         int "Log base 2 of the max number of memory controllers"
 197         default 2
 198         depends on NEED_MULTIPLE_NODES
 199         ---help---
 200           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 201           In a system with more controllers, this value should be raised.
 202
 203 choice
 204         depends on !TILEGX
 205         prompt "Memory split" if EXPERT
 206         default VMSPLIT_3G
 207         ---help---
 208           Select the desired split between kernel and user memory.
 209
 210           If the address range available to the kernel is less than the
 211           physical memory installed, the remaining memory will be available
 212           as "high memory". Accessing high memory is a little more costly
 213           than low memory, as it needs to be mapped into the kernel first.
 214           Note that increasing the kernel address space limits the range
 215           available to user programs, making the address space there
 216           tighter.  Selecting anything other than the default 3G/1G split
 217           will also likely make your kernel incompatible with binary-only
 218           kernel modules.
 219
 220           If you are not absolutely sure what you are doing, leave this
 221           option alone!
 222
 223         config VMSPLIT_3_75G
 224                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 225         config VMSPLIT_3_5G
 226                 bool "3.5G/0.5G user/kernel split"
 227         config VMSPLIT_3G
 228                 bool "3G/1G user/kernel split"
 229         config VMSPLIT_2_75G
 230                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 231         config VMSPLIT_2_5G
 232                 bool "2.5G/1.5G user/kernel split"
 233         config VMSPLIT_2_25G
 234                 bool "2.25G/1.75G user/kernel split"
 235         config VMSPLIT_2G
 236                 bool "2G/2G user/kernel split"
 237         config VMSPLIT_1G
 238                 bool "1G/3G user/kernel split"
 239 endchoice
 240
 241 config PAGE_OFFSET
 242         hex
 243         default 0xF0000000 if VMSPLIT_3_75G
 244         default 0xE0000000 if VMSPLIT_3_5G
 245         default 0xB0000000 if VMSPLIT_2_75G
 246         default 0xA0000000 if VMSPLIT_2_5G
 247         default 0x90000000 if VMSPLIT_2_25G
 248         default 0x80000000 if VMSPLIT_2G
 249         default 0x40000000 if VMSPLIT_1G
 250         default 0xC0000000
 251
 252 source "mm/Kconfig"
 253
 254 config CMDLINE_BOOL
 255         bool "Built-in kernel command line"
 256         default n
 257         ---help---
 258           Allow for specifying boot arguments to the kernel at
 259           build time.  On some systems (e.g. embedded ones), it is
 260           necessary or convenient to provide some or all of the
 261           kernel boot arguments with the kernel itself (that is,
 262           to not rely on the boot loader to provide them.)
 263
 264           To compile command line arguments into the kernel,
 265           set this option to 'Y', then fill in the
 266           the boot arguments in CONFIG_CMDLINE.
 267
 268           Systems with fully functional boot loaders (e.g. mboot, or
 269           if booting over PCI) should leave this option set to 'N'.
 270
 271 config CMDLINE
 272         string "Built-in kernel command string"
 273         depends on CMDLINE_BOOL
 274         default ""
 275         ---help---
 276           Enter arguments here that should be compiled into the kernel
 277           image and used at boot time.  If the boot loader provides a
 278           command line at boot time, it is appended to this string to
 279           form the full kernel command line, when the system boots.
 280
 281           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 282           change this behavior.
 283
 284           In most cases, the command line (whether built-in or provided
 285           by the boot loader) should specify the device for the root
 286           file system.
 287
 288 config CMDLINE_OVERRIDE
 289         bool "Built-in command line overrides boot loader arguments"
 290         default n
 291         depends on CMDLINE_BOOL
 292         ---help---
 293           Set this option to 'Y' to have the kernel ignore the boot loader
 294           command line, and use ONLY the built-in command line.
 295
 296           This is used to work around broken boot loaders.  This should
 297           be set to 'N' under normal conditions.
 298
 299 config VMALLOC_RESERVE
 300         hex
 301         default 0x1000000
 302
 303 config HARDWALL
 304         bool "Hardwall support to allow access to user dynamic network"
 305         default y
 306
 307 config KERNEL_PL
 308         int "Processor protection level for kernel"
 309         range 1 2
 310         default "1"
 311         ---help---
 312           This setting determines the processor protection level the
 313           kernel will be built to run at.  Generally you should use
 314           the default value here.
 315
 316 endmenu  # Tilera-specific configuration
 317
 318 menu "Bus options"
 319
 320 config PCI
 321         bool "PCI support"
 322         default y
 323         select PCI_DOMAINS
 324         select GENERIC_PCI_IOMAP
 325         ---help---
 326           Enable PCI root complex support, so PCIe endpoint devices can
 327           be attached to the Tile chip.  Many, but not all, PCI devices
 328           are supported under Tilera's root complex driver.
 329
 330 config PCI_DOMAINS
 331         bool
 332
 333 config NO_IOMEM
 334         def_bool !PCI
 335
 336 config NO_IOPORT
 337         def_bool !PCI
 338
 339 source "drivers/pci/Kconfig"
 340
 341 config HOTPLUG
 342         bool "Support for hot-pluggable devices"
 343         ---help---
 344           Say Y here if you want to plug devices into your computer while
 345           the system is running, and be able to use them quickly.  In many
 346           cases, the devices can likewise be unplugged at any time too.
 347           One well-known example of this is USB.
 348
 349 source "drivers/pci/hotplug/Kconfig"
 350
 351 endmenu
 352
 353 menu "Executable file formats"
 354
 355 # only elf supported
 356 config KCORE_ELF
 357         def_bool y
 358         depends on PROC_FS
 359
 360 source "fs/Kconfig.binfmt"
 361
 362 endmenu
 363
 364 source "net/Kconfig"
 365
 366 source "drivers/Kconfig"
 367
 368 source "fs/Kconfig"
 369
 370 source "arch/tile/Kconfig.debug"
 371
 372 source "security/Kconfig"
 373
 374 source "crypto/Kconfig"
 375
 376 source "lib/Kconfig"
 377
 378 source "arch/tile/kvm/Kconfig"