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
  16         select GENERIC_CLOCKEVENTS
  17
  18 # FIXME: investigate whether we need/want these options.
  19 #       select HAVE_IOREMAP_PROT
  20 #       select HAVE_OPTPROBES
  21 #       select HAVE_REGS_AND_STACK_ACCESS_API
  22 #       select HAVE_HW_BREAKPOINT
  23 #       select PERF_EVENTS
  24 #       select HAVE_USER_RETURN_NOTIFIER
  25 #       config NO_BOOTMEM
  26 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  27 #       config HUGETLB_PAGE_SIZE_VARIABLE
  28
  29 config MMU
  30         def_bool y
  31
  32 config GENERIC_CSUM
  33         def_bool y
  34
  35 config SEMAPHORE_SLEEPERS
  36         def_bool y
  37
  38 config HAVE_ARCH_ALLOC_REMAP
  39         def_bool y
  40
  41 config HAVE_SETUP_PER_CPU_AREA
  42         def_bool y
  43
  44 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  45         def_bool y
  46
  47 config SYS_SUPPORTS_HUGETLBFS
  48         def_bool y
  49
  50 # FIXME: tilegx can implement a more efficient rwsem.
  51 config RWSEM_GENERIC_SPINLOCK
  52         def_bool y
  53
  54 # We have a very flat architecture from a migration point of view,
  55 # so save boot time by presetting this (particularly useful on tile-sim).
  56 config DEFAULT_MIGRATION_COST
  57         int
  58         default "10000000"
  59
  60 # We only support gcc 4.4 and above, so this should work.
  61 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  62         def_bool y
  63
  64 config ARCH_PHYS_ADDR_T_64BIT
  65         def_bool y
  66
  67 config ARCH_DMA_ADDR_T_64BIT
  68         def_bool y
  69
  70 config NEED_DMA_MAP_STATE
  71         def_bool y
  72
  73 config LOCKDEP_SUPPORT
  74         def_bool y
  75
  76 config STACKTRACE_SUPPORT
  77         def_bool y
  78         select STACKTRACE
  79
  80 # We use discontigmem for now; at some point we may want to switch
  81 # to sparsemem (Tilera bug 7996).
  82 config ARCH_DISCONTIGMEM_ENABLE
  83         def_bool y
  84
  85 config ARCH_DISCONTIGMEM_DEFAULT
  86         def_bool y
  87
  88 config TRACE_IRQFLAGS_SUPPORT
  89         def_bool y
  90
  91 config STRICT_DEVMEM
  92         def_bool y
  93
  94 # SMP is required for Tilera Linux.
  95 config SMP
  96         def_bool y
  97
  98 # Allow checking for compile-time determined overflow errors in
  99 # copy_from_user().  There are still unprovable places in the
 100 # generic code as of 2.6.34, so this option is not really compatible
 101 # with -Werror, which is more useful in general.
 102 config DEBUG_COPY_FROM_USER
 103         def_bool n
 104
 105 config HVC_TILE
 106         select HVC_DRIVER
 107         def_bool y
 108
 109 # Please note: TILE-Gx support is not yet finalized; this is
 110 # the preliminary support.  TILE-Gx drivers are only provided
 111 # with the alpha or beta test versions for Tilera customers.
 112 config TILEGX
 113         depends on EXPERIMENTAL
 114         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 115
 116 config 64BIT
 117         depends on TILEGX
 118         def_bool y
 119
 120 config ARCH_DEFCONFIG
 121         string
 122         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 123         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 124
 125 source "init/Kconfig"
 126
 127 menu "Tilera-specific configuration"
 128
 129 config NR_CPUS
 130         int "Maximum number of tiles (2-255)"
 131         range 2 255
 132         depends on SMP
 133         default "64"
 134         ---help---
 135           Building with 64 is the recommended value, but a slightly
 136           smaller kernel memory footprint results from using a smaller
 137           value on chips with fewer tiles.
 138
 139 source "kernel/time/Kconfig"
 140
 141 source "kernel/Kconfig.hz"
 142
 143 config KEXEC
 144         bool "kexec system call"
 145         ---help---
 146           kexec is a system call that implements the ability to shutdown your
 147           current kernel, and to start another kernel.  It is like a reboot
 148           but it is independent of the system firmware.   It is used
 149           to implement the "mboot" Tilera booter.
 150
 151           The name comes from the similarity to the exec system call.
 152
 153 config COMPAT
 154         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 155         depends on TILEGX
 156         select COMPAT_BINFMT_ELF
 157         default y
 158         ---help---
 159           If enabled, the kernel will support running TILE-Gx binaries
 160           that were built with the -m32 option.
 161
 162 config SYSVIPC_COMPAT
 163         def_bool y
 164         depends on COMPAT && SYSVIPC
 165
 166 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 167 config HIGHMEM
 168         bool # "Support for more than 512 MB of RAM"
 169         default !TILEGX
 170         ---help---
 171           Linux can use the full amount of RAM in the system by
 172           default.  However, the address space of TILE processors is
 173           only 4 Gigabytes large. That means that, if you have a large
 174           amount of physical memory, not all of it can be "permanently
 175           mapped" by the kernel. The physical memory that's not
 176           permanently mapped is called "high memory".
 177
 178           If you are compiling a kernel which will never run on a
 179           machine with more than 512 MB total physical RAM, answer
 180           "false" here. This will result in the kernel mapping all of
 181           physical memory into the top 1 GB of virtual memory space.
 182
 183           If unsure, say "true".
 184
 185 # We do not currently support disabling NUMA.
 186 config NUMA
 187         bool # "NUMA Memory Allocation and Scheduler Support"
 188         depends on SMP && DISCONTIGMEM
 189         default y
 190         ---help---
 191           NUMA memory allocation is required for TILE processors
 192           unless booting with memory striping enabled in the
 193           hypervisor, or with only a single memory controller.
 194           It is recommended that this option always be enabled.
 195
 196 config NODES_SHIFT
 197         int "Log base 2 of the max number of memory controllers"
 198         default 2
 199         depends on NEED_MULTIPLE_NODES
 200         ---help---
 201           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 202           In a system with more controllers, this value should be raised.
 203
 204 choice
 205         depends on !TILEGX
 206         prompt "Memory split" if EXPERT
 207         default VMSPLIT_3G
 208         ---help---
 209           Select the desired split between kernel and user memory.
 210
 211           If the address range available to the kernel is less than the
 212           physical memory installed, the remaining memory will be available
 213           as "high memory". Accessing high memory is a little more costly
 214           than low memory, as it needs to be mapped into the kernel first.
 215           Note that increasing the kernel address space limits the range
 216           available to user programs, making the address space there
 217           tighter.  Selecting anything other than the default 3G/1G split
 218           will also likely make your kernel incompatible with binary-only
 219           kernel modules.
 220
 221           If you are not absolutely sure what you are doing, leave this
 222           option alone!
 223
 224         config VMSPLIT_3_75G
 225                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 226         config VMSPLIT_3_5G
 227                 bool "3.5G/0.5G user/kernel split"
 228         config VMSPLIT_3G
 229                 bool "3G/1G user/kernel split"
 230         config VMSPLIT_2_75G
 231                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 232         config VMSPLIT_2_5G
 233                 bool "2.5G/1.5G user/kernel split"
 234         config VMSPLIT_2_25G
 235                 bool "2.25G/1.75G user/kernel split"
 236         config VMSPLIT_2G
 237                 bool "2G/2G user/kernel split"
 238         config VMSPLIT_1G
 239                 bool "1G/3G user/kernel split"
 240 endchoice
 241
 242 config PAGE_OFFSET
 243         hex
 244         depends on !64BIT
 245         default 0xF0000000 if VMSPLIT_3_75G
 246         default 0xE0000000 if VMSPLIT_3_5G
 247         default 0xB0000000 if VMSPLIT_2_75G
 248         default 0xA0000000 if VMSPLIT_2_5G
 249         default 0x90000000 if VMSPLIT_2_25G
 250         default 0x80000000 if VMSPLIT_2G
 251         default 0x40000000 if VMSPLIT_1G
 252         default 0xC0000000
 253
 254 source "mm/Kconfig"
 255
 256 config CMDLINE_BOOL
 257         bool "Built-in kernel command line"
 258         default n
 259         ---help---
 260           Allow for specifying boot arguments to the kernel at
 261           build time.  On some systems (e.g. embedded ones), it is
 262           necessary or convenient to provide some or all of the
 263           kernel boot arguments with the kernel itself (that is,
 264           to not rely on the boot loader to provide them.)
 265
 266           To compile command line arguments into the kernel,
 267           set this option to 'Y', then fill in the
 268           the boot arguments in CONFIG_CMDLINE.
 269
 270           Systems with fully functional boot loaders (e.g. mboot, or
 271           if booting over PCI) should leave this option set to 'N'.
 272
 273 config CMDLINE
 274         string "Built-in kernel command string"
 275         depends on CMDLINE_BOOL
 276         default ""
 277         ---help---
 278           Enter arguments here that should be compiled into the kernel
 279           image and used at boot time.  If the boot loader provides a
 280           command line at boot time, it is appended to this string to
 281           form the full kernel command line, when the system boots.
 282
 283           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 284           change this behavior.
 285
 286           In most cases, the command line (whether built-in or provided
 287           by the boot loader) should specify the device for the root
 288           file system.
 289
 290 config CMDLINE_OVERRIDE
 291         bool "Built-in command line overrides boot loader arguments"
 292         default n
 293         depends on CMDLINE_BOOL
 294         ---help---
 295           Set this option to 'Y' to have the kernel ignore the boot loader
 296           command line, and use ONLY the built-in command line.
 297
 298           This is used to work around broken boot loaders.  This should
 299           be set to 'N' under normal conditions.
 300
 301 config VMALLOC_RESERVE
 302         hex
 303         default 0x1000000
 304
 305 config HARDWALL
 306         bool "Hardwall support to allow access to user dynamic network"
 307         default y
 308
 309 config KERNEL_PL
 310         int "Processor protection level for kernel"
 311         range 1 2
 312         default "1"
 313         ---help---
 314           This setting determines the processor protection level the
 315           kernel will be built to run at.  Generally you should use
 316           the default value here.
 317
 318 endmenu  # Tilera-specific configuration
 319
 320 menu "Bus options"
 321
 322 config PCI
 323         bool "PCI support"
 324         default y
 325         select PCI_DOMAINS
 326         select GENERIC_PCI_IOMAP
 327         ---help---
 328           Enable PCI root complex support, so PCIe endpoint devices can
 329           be attached to the Tile chip.  Many, but not all, PCI devices
 330           are supported under Tilera's root complex driver.
 331
 332 config PCI_DOMAINS
 333         bool
 334
 335 config NO_IOMEM
 336         def_bool !PCI
 337
 338 config NO_IOPORT
 339         def_bool !PCI
 340
 341 source "drivers/pci/Kconfig"
 342
 343 config HOTPLUG
 344         bool "Support for hot-pluggable devices"
 345         ---help---
 346           Say Y here if you want to plug devices into your computer while
 347           the system is running, and be able to use them quickly.  In many
 348           cases, the devices can likewise be unplugged at any time too.
 349           One well-known example of this is USB.
 350
 351 source "drivers/pci/hotplug/Kconfig"
 352
 353 endmenu
 354
 355 menu "Executable file formats"
 356
 357 # only elf supported
 358 config KCORE_ELF
 359         def_bool y
 360         depends on PROC_FS
 361
 362 source "fs/Kconfig.binfmt"
 363
 364 endmenu
 365
 366 source "net/Kconfig"
 367
 368 source "drivers/Kconfig"
 369
 370 source "fs/Kconfig"
 371
 372 source "arch/tile/Kconfig.debug"
 373
 374 source "security/Kconfig"
 375
 376 source "crypto/Kconfig"
 377
 378 source "lib/Kconfig"
 379
 380 source "arch/tile/kvm/Kconfig"