The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/Kconfig

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    1 #
    2 # Library configuration
    3 #
    4 
    5 config BINARY_PRINTF
    6         def_bool n
    7 
    8 menu "Library routines"
    9 
   10 config RAID6_PQ
   11         tristate
   12 
   13 config BITREVERSE
   14         tristate
   15 
   16 config RATIONAL
   17         boolean
   18 
   19 config GENERIC_STRNCPY_FROM_USER
   20         bool
   21 
   22 config GENERIC_STRNLEN_USER
   23         bool
   24 
   25 config GENERIC_FIND_FIRST_BIT
   26         bool
   27 
   28 config NO_GENERIC_PCI_IOPORT_MAP
   29         bool
   30 
   31 config GENERIC_PCI_IOMAP
   32         bool
   33 
   34 config GENERIC_IOMAP
   35         bool
   36         select GENERIC_PCI_IOMAP
   37 
   38 config GENERIC_IO
   39         boolean
   40         default n
   41 
   42 config STMP_DEVICE
   43         bool
   44 
   45 config PERCPU_RWSEM
   46         boolean
   47 
   48 config CRC_CCITT
   49         tristate "CRC-CCITT functions"
   50         help
   51           This option is provided for the case where no in-kernel-tree
   52           modules require CRC-CCITT functions, but a module built outside
   53           the kernel tree does. Such modules that use library CRC-CCITT
   54           functions require M here.
   55 
   56 config CRC16
   57         tristate "CRC16 functions"
   58         help
   59           This option is provided for the case where no in-kernel-tree
   60           modules require CRC16 functions, but a module built outside
   61           the kernel tree does. Such modules that use library CRC16
   62           functions require M here.
   63 
   64 config CRC_T10DIF
   65         tristate "CRC calculation for the T10 Data Integrity Field"
   66         help
   67           This option is only needed if a module that's not in the
   68           kernel tree needs to calculate CRC checks for use with the
   69           SCSI data integrity subsystem.
   70 
   71 config CRC_ITU_T
   72         tristate "CRC ITU-T V.41 functions"
   73         help
   74           This option is provided for the case where no in-kernel-tree
   75           modules require CRC ITU-T V.41 functions, but a module built outside
   76           the kernel tree does. Such modules that use library CRC ITU-T V.41
   77           functions require M here.
   78 
   79 config CRC32
   80         tristate "CRC32/CRC32c functions"
   81         default y
   82         select BITREVERSE
   83         help
   84           This option is provided for the case where no in-kernel-tree
   85           modules require CRC32/CRC32c functions, but a module built outside
   86           the kernel tree does. Such modules that use library CRC32/CRC32c
   87           functions require M here.
   88 
   89 config CRC32_SELFTEST
   90         bool "CRC32 perform self test on init"
   91         default n
   92         depends on CRC32
   93         help
   94           This option enables the CRC32 library functions to perform a
   95           self test on initialization. The self test computes crc32_le
   96           and crc32_be over byte strings with random alignment and length
   97           and computes the total elapsed time and number of bytes processed.
   98 
   99 choice
  100         prompt "CRC32 implementation"
  101         depends on CRC32
  102         default CRC32_SLICEBY8
  103         help
  104           This option allows a kernel builder to override the default choice
  105           of CRC32 algorithm.  Choose the default ("slice by 8") unless you
  106           know that you need one of the others.
  107 
  108 config CRC32_SLICEBY8
  109         bool "Slice by 8 bytes"
  110         help
  111           Calculate checksum 8 bytes at a time with a clever slicing algorithm.
  112           This is the fastest algorithm, but comes with a 8KiB lookup table.
  113           Most modern processors have enough cache to hold this table without
  114           thrashing the cache.
  115 
  116           This is the default implementation choice.  Choose this one unless
  117           you have a good reason not to.
  118 
  119 config CRC32_SLICEBY4
  120         bool "Slice by 4 bytes"
  121         help
  122           Calculate checksum 4 bytes at a time with a clever slicing algorithm.
  123           This is a bit slower than slice by 8, but has a smaller 4KiB lookup
  124           table.
  125 
  126           Only choose this option if you know what you are doing.
  127 
  128 config CRC32_SARWATE
  129         bool "Sarwate's Algorithm (one byte at a time)"
  130         help
  131           Calculate checksum a byte at a time using Sarwate's algorithm.  This
  132           is not particularly fast, but has a small 256 byte lookup table.
  133 
  134           Only choose this option if you know what you are doing.
  135 
  136 config CRC32_BIT
  137         bool "Classic Algorithm (one bit at a time)"
  138         help
  139           Calculate checksum one bit at a time.  This is VERY slow, but has
  140           no lookup table.  This is provided as a debugging option.
  141 
  142           Only choose this option if you are debugging crc32.
  143 
  144 endchoice
  145 
  146 config CRC7
  147         tristate "CRC7 functions"
  148         help
  149           This option is provided for the case where no in-kernel-tree
  150           modules require CRC7 functions, but a module built outside
  151           the kernel tree does. Such modules that use library CRC7
  152           functions require M here.
  153 
  154 config LIBCRC32C
  155         tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"
  156         select CRYPTO
  157         select CRYPTO_CRC32C
  158         help
  159           This option is provided for the case where no in-kernel-tree
  160           modules require CRC32c functions, but a module built outside the
  161           kernel tree does. Such modules that use library CRC32c functions
  162           require M here.  See Castagnoli93.
  163           Module will be libcrc32c.
  164 
  165 config CRC8
  166         tristate "CRC8 function"
  167         help
  168           This option provides CRC8 function. Drivers may select this
  169           when they need to do cyclic redundancy check according CRC8
  170           algorithm. Module will be called crc8.
  171 
  172 config AUDIT_GENERIC
  173         bool
  174         depends on AUDIT && !AUDIT_ARCH
  175         default y
  176 
  177 #
  178 # compression support is select'ed if needed
  179 #
  180 config ZLIB_INFLATE
  181         tristate
  182 
  183 config ZLIB_DEFLATE
  184         tristate
  185 
  186 config LZO_COMPRESS
  187         tristate
  188 
  189 config LZO_DECOMPRESS
  190         tristate
  191 
  192 source "lib/xz/Kconfig"
  193 
  194 #
  195 # These all provide a common interface (hence the apparent duplication with
  196 # ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)
  197 #
  198 config DECOMPRESS_GZIP
  199         select ZLIB_INFLATE
  200         tristate
  201 
  202 config DECOMPRESS_BZIP2
  203         tristate
  204 
  205 config DECOMPRESS_LZMA
  206         tristate
  207 
  208 config DECOMPRESS_XZ
  209         select XZ_DEC
  210         tristate
  211 
  212 config DECOMPRESS_LZO
  213         select LZO_DECOMPRESS
  214         tristate
  215 
  216 #
  217 # Generic allocator support is selected if needed
  218 #
  219 config GENERIC_ALLOCATOR
  220         boolean
  221 
  222 #
  223 # reed solomon support is select'ed if needed
  224 #
  225 config REED_SOLOMON
  226         tristate
  227         
  228 config REED_SOLOMON_ENC8
  229         boolean
  230 
  231 config REED_SOLOMON_DEC8
  232         boolean
  233 
  234 config REED_SOLOMON_ENC16
  235         boolean
  236 
  237 config REED_SOLOMON_DEC16
  238         boolean
  239 
  240 #
  241 # BCH support is selected if needed
  242 #
  243 config BCH
  244         tristate
  245 
  246 config BCH_CONST_PARAMS
  247         boolean
  248         help
  249           Drivers may select this option to force specific constant
  250           values for parameters 'm' (Galois field order) and 't'
  251           (error correction capability). Those specific values must
  252           be set by declaring default values for symbols BCH_CONST_M
  253           and BCH_CONST_T.
  254           Doing so will enable extra compiler optimizations,
  255           improving encoding and decoding performance up to 2x for
  256           usual (m,t) values (typically such that m*t < 200).
  257           When this option is selected, the BCH library supports
  258           only a single (m,t) configuration. This is mainly useful
  259           for NAND flash board drivers requiring known, fixed BCH
  260           parameters.
  261 
  262 config BCH_CONST_M
  263         int
  264         range 5 15
  265         help
  266           Constant value for Galois field order 'm'. If 'k' is the
  267           number of data bits to protect, 'm' should be chosen such
  268           that (k + m*t) <= 2**m - 1.
  269           Drivers should declare a default value for this symbol if
  270           they select option BCH_CONST_PARAMS.
  271 
  272 config BCH_CONST_T
  273         int
  274         help
  275           Constant value for error correction capability in bits 't'.
  276           Drivers should declare a default value for this symbol if
  277           they select option BCH_CONST_PARAMS.
  278 
  279 #
  280 # Textsearch support is select'ed if needed
  281 #
  282 config TEXTSEARCH
  283         boolean
  284 
  285 config TEXTSEARCH_KMP
  286         tristate
  287 
  288 config TEXTSEARCH_BM
  289         tristate
  290 
  291 config TEXTSEARCH_FSM
  292         tristate
  293 
  294 config BTREE
  295         boolean
  296 
  297 config HAS_IOMEM
  298         boolean
  299         depends on !NO_IOMEM
  300         select GENERIC_IO
  301         default y
  302 
  303 config HAS_IOPORT
  304         boolean
  305         depends on HAS_IOMEM && !NO_IOPORT
  306         default y
  307 
  308 config HAS_DMA
  309         boolean
  310         depends on !NO_DMA
  311         default y
  312 
  313 config CHECK_SIGNATURE
  314         bool
  315 
  316 config CPUMASK_OFFSTACK
  317         bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS
  318         help
  319           Use dynamic allocation for cpumask_var_t, instead of putting
  320           them on the stack.  This is a bit more expensive, but avoids
  321           stack overflow.
  322 
  323 config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
  324        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
  325        depends on EXPERIMENTAL && BROKEN
  326 
  327 config CPU_RMAP
  328         bool
  329         depends on SMP
  330 
  331 config DQL
  332         bool
  333 
  334 #
  335 # Netlink attribute parsing support is select'ed if needed
  336 #
  337 config NLATTR
  338         bool
  339 
  340 #
  341 # Generic 64-bit atomic support is selected if needed
  342 #
  343 config GENERIC_ATOMIC64
  344        bool
  345 
  346 config ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
  347         def_bool y if GENERIC_ATOMIC64
  348 
  349 config LRU_CACHE
  350         tristate
  351 
  352 config AVERAGE
  353         bool "Averaging functions"
  354         help
  355           This option is provided for the case where no in-kernel-tree
  356           modules require averaging functions, but a module built outside
  357           the kernel tree does. Such modules that use library averaging
  358           functions require Y here.
  359 
  360           If unsure, say N.
  361 
  362 config CLZ_TAB
  363         bool
  364 
  365 config CORDIC
  366         tristate "CORDIC algorithm"
  367         help
  368           This option provides an implementation of the CORDIC algorithm;
  369           calculations are in fixed point. Module will be called cordic.
  370 
  371 config DDR
  372         bool "JEDEC DDR data"
  373         help
  374           Data from JEDEC specs for DDR SDRAM memories,
  375           particularly the AC timing parameters and addressing
  376           information. This data is useful for drivers handling
  377           DDR SDRAM controllers.
  378 
  379 config MPILIB
  380         tristate
  381         select CLZ_TAB
  382         help
  383           Multiprecision maths library from GnuPG.
  384           It is used to implement RSA digital signature verification,
  385           which is used by IMA/EVM digital signature extension.
  386 
  387 config SIGNATURE
  388         tristate
  389         depends on KEYS && CRYPTO
  390         select CRYPTO_SHA1
  391         select MPILIB
  392         help
  393           Digital signature verification. Currently only RSA is supported.
  394           Implementation is done using GnuPG MPI library
  395 
  396 #
  397 # libfdt files, only selected if needed.
  398 #
  399 config LIBFDT
  400         bool
  401 
  402 config OID_REGISTRY
  403         tristate
  404         help
  405           Enable fast lookup object identifier registry.
  406 
  407 endmenu

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