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 HAVE_SYSCALL_WRAPPERS if TILEGX
  15         select SYS_HYPERVISOR
  16         select ARCH_HAVE_NMI_SAFE_CMPXCHG
  17         select GENERIC_CLOCKEVENTS
  18
  19 # FIXME: investigate whether we need/want these options.
  20 #       select HAVE_IOREMAP_PROT
  21 #       select HAVE_OPTPROBES
  22 #       select HAVE_REGS_AND_STACK_ACCESS_API
  23 #       select HAVE_HW_BREAKPOINT
  24 #       select PERF_EVENTS
  25 #       select HAVE_USER_RETURN_NOTIFIER
  26 #       config NO_BOOTMEM
  27 #       config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  28 #       config HUGETLB_PAGE_SIZE_VARIABLE
  29
  30 config MMU
  31         def_bool y
  32
  33 config GENERIC_CSUM
  34         def_bool y
  35
  36 config SEMAPHORE_SLEEPERS
  37         def_bool y
  38
  39 config HAVE_ARCH_ALLOC_REMAP
  40         def_bool y
  41
  42 config HAVE_SETUP_PER_CPU_AREA
  43         def_bool y
  44
  45 config NEED_PER_CPU_PAGE_FIRST_CHUNK
  46         def_bool y
  47
  48 config SYS_SUPPORTS_HUGETLBFS
  49         def_bool y
  50
  51 # Support for additional huge page sizes besides HPAGE_SIZE.
  52 # The software support is currently only present in the TILE-Gx
  53 # hypervisor. TILEPro in any case does not support page sizes
  54 # larger than the default HPAGE_SIZE.
  55 config HUGETLB_SUPER_PAGES
  56         depends on HUGETLB_PAGE && TILEGX
  57         def_bool y
  58
  59 # FIXME: tilegx can implement a more efficient rwsem.
  60 config RWSEM_GENERIC_SPINLOCK
  61         def_bool y
  62
  63 # We have a very flat architecture from a migration point of view,
  64 # so save boot time by presetting this (particularly useful on tile-sim).
  65 config DEFAULT_MIGRATION_COST
  66         int
  67         default "10000000"
  68
  69 # We only support gcc 4.4 and above, so this should work.
  70 config ARCH_SUPPORTS_OPTIMIZED_INLINING
  71         def_bool y
  72
  73 config ARCH_PHYS_ADDR_T_64BIT
  74         def_bool y
  75
  76 config ARCH_DMA_ADDR_T_64BIT
  77         def_bool y
  78
  79 config NEED_DMA_MAP_STATE
  80         def_bool y
  81
  82 config LOCKDEP_SUPPORT
  83         def_bool y
  84
  85 config STACKTRACE_SUPPORT
  86         def_bool y
  87         select STACKTRACE
  88
  89 # We use discontigmem for now; at some point we may want to switch
  90 # to sparsemem (Tilera bug 7996).
  91 config ARCH_DISCONTIGMEM_ENABLE
  92         def_bool y
  93
  94 config ARCH_DISCONTIGMEM_DEFAULT
  95         def_bool y
  96
  97 config TRACE_IRQFLAGS_SUPPORT
  98         def_bool y
  99
 100 config STRICT_DEVMEM
 101         def_bool y
 102
 103 # SMP is required for Tilera Linux.
 104 config SMP
 105         def_bool y
 106
 107 # Allow checking for compile-time determined overflow errors in
 108 # copy_from_user().  There are still unprovable places in the
 109 # generic code as of 2.6.34, so this option is not really compatible
 110 # with -Werror, which is more useful in general.
 111 config DEBUG_COPY_FROM_USER
 112         def_bool n
 113
 114 config HVC_TILE
 115         select HVC_DRIVER
 116         def_bool y
 117
 118 config TILEGX
 119         bool "Building with TILE-Gx (64-bit) compiler and toolchain"
 120
 121 config TILEPRO
 122         def_bool !TILEGX
 123
 124 config 64BIT
 125         def_bool TILEGX
 126
 127 config ARCH_DEFCONFIG
 128         string
 129         default "arch/tile/configs/tilepro_defconfig" if !TILEGX
 130         default "arch/tile/configs/tilegx_defconfig" if TILEGX
 131
 132 source "init/Kconfig"
 133
 134 menu "Tilera-specific configuration"
 135
 136 config NR_CPUS
 137         int "Maximum number of tiles (2-255)"
 138         range 2 255
 139         depends on SMP
 140         default "64"
 141         ---help---
 142           Building with 64 is the recommended value, but a slightly
 143           smaller kernel memory footprint results from using a smaller
 144           value on chips with fewer tiles.
 145
 146 if TILEGX
 147
 148 choice
 149         prompt "Kernel page size"
 150         default PAGE_SIZE_64KB
 151         help
 152           This lets you select the page size of the kernel.  For best
 153           performance on memory-intensive applications, a page size of 64KB
 154           is recommended.  For workloads involving many small files, many
 155           connections, etc., it may be better to select 16KB, which uses
 156           memory more efficiently at some cost in TLB performance.
 157
 158           Note that this option is TILE-Gx specific; currently
 159           TILEPro page size is set by rebuilding the hypervisor.
 160
 161 config PAGE_SIZE_16KB
 162         bool "16KB"
 163
 164 config PAGE_SIZE_64KB
 165         bool "64KB"
 166
 167 endchoice
 168
 169 endif
 170
 171 source "kernel/Kconfig.hz"
 172
 173 config KEXEC
 174         bool "kexec system call"
 175         ---help---
 176           kexec is a system call that implements the ability to shutdown your
 177           current kernel, and to start another kernel.  It is like a reboot
 178           but it is independent of the system firmware.   It is used
 179           to implement the "mboot" Tilera booter.
 180
 181           The name comes from the similarity to the exec system call.
 182
 183 config COMPAT
 184         bool "Support 32-bit TILE-Gx binaries in addition to 64-bit"
 185         depends on TILEGX
 186         select COMPAT_BINFMT_ELF
 187         default y
 188         ---help---
 189           If enabled, the kernel will support running TILE-Gx binaries
 190           that were built with the -m32 option.
 191
 192 config SYSVIPC_COMPAT
 193         def_bool y
 194         depends on COMPAT && SYSVIPC
 195
 196 # We do not currently support disabling HIGHMEM on tile64 and tilepro.
 197 config HIGHMEM
 198         bool # "Support for more than 512 MB of RAM"
 199         default !TILEGX
 200         ---help---
 201           Linux can use the full amount of RAM in the system by
 202           default.  However, the address space of TILE processors is
 203           only 4 Gigabytes large. That means that, if you have a large
 204           amount of physical memory, not all of it can be "permanently
 205           mapped" by the kernel. The physical memory that's not
 206           permanently mapped is called "high memory".
 207
 208           If you are compiling a kernel which will never run on a
 209           machine with more than 512 MB total physical RAM, answer
 210           "false" here. This will result in the kernel mapping all of
 211           physical memory into the top 1 GB of virtual memory space.
 212
 213           If unsure, say "true".
 214
 215 # We do not currently support disabling NUMA.
 216 config NUMA
 217         bool # "NUMA Memory Allocation and Scheduler Support"
 218         depends on SMP && DISCONTIGMEM
 219         default y
 220         ---help---
 221           NUMA memory allocation is required for TILE processors
 222           unless booting with memory striping enabled in the
 223           hypervisor, or with only a single memory controller.
 224           It is recommended that this option always be enabled.
 225
 226 config NODES_SHIFT
 227         int "Log base 2 of the max number of memory controllers"
 228         default 2
 229         depends on NEED_MULTIPLE_NODES
 230         ---help---
 231           By default, 2, i.e. 2^2 == 4 DDR2 controllers.
 232           In a system with more controllers, this value should be raised.
 233
 234 choice
 235         depends on !TILEGX
 236         prompt "Memory split" if EXPERT
 237         default VMSPLIT_3G
 238         ---help---
 239           Select the desired split between kernel and user memory.
 240
 241           If the address range available to the kernel is less than the
 242           physical memory installed, the remaining memory will be available
 243           as "high memory". Accessing high memory is a little more costly
 244           than low memory, as it needs to be mapped into the kernel first.
 245           Note that increasing the kernel address space limits the range
 246           available to user programs, making the address space there
 247           tighter.  Selecting anything other than the default 3G/1G split
 248           will also likely make your kernel incompatible with binary-only
 249           kernel modules.
 250
 251           If you are not absolutely sure what you are doing, leave this
 252           option alone!
 253
 254         config VMSPLIT_3_75G
 255                 bool "3.75G/0.25G user/kernel split (no kernel networking)"
 256         config VMSPLIT_3_5G
 257                 bool "3.5G/0.5G user/kernel split"
 258         config VMSPLIT_3G
 259                 bool "3G/1G user/kernel split"
 260         config VMSPLIT_2_75G
 261                 bool "2.75G/1.25G user/kernel split (for full 1G low memory)"
 262         config VMSPLIT_2_5G
 263                 bool "2.5G/1.5G user/kernel split"
 264         config VMSPLIT_2_25G
 265                 bool "2.25G/1.75G user/kernel split"
 266         config VMSPLIT_2G
 267                 bool "2G/2G user/kernel split"
 268         config VMSPLIT_1G
 269                 bool "1G/3G user/kernel split"
 270 endchoice
 271
 272 config PAGE_OFFSET
 273         hex
 274         depends on !64BIT
 275         default 0xF0000000 if VMSPLIT_3_75G
 276         default 0xE0000000 if VMSPLIT_3_5G
 277         default 0xB0000000 if VMSPLIT_2_75G
 278         default 0xA0000000 if VMSPLIT_2_5G
 279         default 0x90000000 if VMSPLIT_2_25G
 280         default 0x80000000 if VMSPLIT_2G
 281         default 0x40000000 if VMSPLIT_1G
 282         default 0xC0000000
 283
 284 source "mm/Kconfig"
 285
 286 config CMDLINE_BOOL
 287         bool "Built-in kernel command line"
 288         default n
 289         ---help---
 290           Allow for specifying boot arguments to the kernel at
 291           build time.  On some systems (e.g. embedded ones), it is
 292           necessary or convenient to provide some or all of the
 293           kernel boot arguments with the kernel itself (that is,
 294           to not rely on the boot loader to provide them.)
 295
 296           To compile command line arguments into the kernel,
 297           set this option to 'Y', then fill in the
 298           the boot arguments in CONFIG_CMDLINE.
 299
 300           Systems with fully functional boot loaders (e.g. mboot, or
 301           if booting over PCI) should leave this option set to 'N'.
 302
 303 config CMDLINE
 304         string "Built-in kernel command string"
 305         depends on CMDLINE_BOOL
 306         default ""
 307         ---help---
 308           Enter arguments here that should be compiled into the kernel
 309           image and used at boot time.  If the boot loader provides a
 310           command line at boot time, it is appended to this string to
 311           form the full kernel command line, when the system boots.
 312
 313           However, you can use the CONFIG_CMDLINE_OVERRIDE option to
 314           change this behavior.
 315
 316           In most cases, the command line (whether built-in or provided
 317           by the boot loader) should specify the device for the root
 318           file system.
 319
 320 config CMDLINE_OVERRIDE
 321         bool "Built-in command line overrides boot loader arguments"
 322         default n
 323         depends on CMDLINE_BOOL
 324         ---help---
 325           Set this option to 'Y' to have the kernel ignore the boot loader
 326           command line, and use ONLY the built-in command line.
 327
 328           This is used to work around broken boot loaders.  This should
 329           be set to 'N' under normal conditions.
 330
 331 config VMALLOC_RESERVE
 332         hex
 333         default 0x1000000
 334
 335 config HARDWALL
 336         bool "Hardwall support to allow access to user dynamic network"
 337         default y
 338
 339 config KERNEL_PL
 340         int "Processor protection level for kernel"
 341         range 1 2
 342         default "1"
 343         ---help---
 344           This setting determines the processor protection level the
 345           kernel will be built to run at.  Generally you should use
 346           the default value here.
 347
 348 endmenu  # Tilera-specific configuration
 349
 350 menu "Bus options"
 351
 352 config PCI
 353         bool "PCI support"
 354         default y
 355         select PCI_DOMAINS
 356         select GENERIC_PCI_IOMAP
 357         ---help---
 358           Enable PCI root complex support, so PCIe endpoint devices can
 359           be attached to the Tile chip.  Many, but not all, PCI devices
 360           are supported under Tilera's root complex driver.
 361
 362 config PCI_DOMAINS
 363         bool
 364
 365 config NO_IOMEM
 366         def_bool !PCI
 367
 368 config NO_IOPORT
 369         def_bool !PCI
 370
 371 source "drivers/pci/Kconfig"
 372
 373 config HOTPLUG
 374         bool "Support for hot-pluggable devices"
 375         ---help---
 376           Say Y here if you want to plug devices into your computer while
 377           the system is running, and be able to use them quickly.  In many
 378           cases, the devices can likewise be unplugged at any time too.
 379           One well-known example of this is USB.
 380
 381 source "drivers/pci/hotplug/Kconfig"
 382
 383 endmenu
 384
 385 menu "Executable file formats"
 386
 387 # only elf supported
 388 config KCORE_ELF
 389         def_bool y
 390         depends on PROC_FS
 391
 392 source "fs/Kconfig.binfmt"
 393
 394 endmenu
 395
 396 source "net/Kconfig"
 397
 398 source "drivers/Kconfig"
 399
 400 source "fs/Kconfig"
 401
 402 source "arch/tile/Kconfig.debug"
 403
 404 source "security/Kconfig"
 405
 406 source "crypto/Kconfig"
 407
 408 source "lib/Kconfig"
 409
 410 source "arch/tile/kvm/Kconfig"