#

# Library configuration

#

config BINARY_PRINTF

def_bool n

menu "Library routines"

config RAID6_PQ

tristate

config BITREVERSE

tristate

config RATIONAL

boolean

config GENERIC_FIND_FIRST_BIT

bool

config NO_GENERIC_PCI_IOPORT_MAP

bool

config GENERIC_PCI_IOMAP

bool

config GENERIC_IOMAP

bool

select GENERIC_PCI_IOMAP

config GENERIC_IO

boolean

default n

config CRC_CCITT

tristate "CRC-CCITT functions"

help

This option is provided for the case where no in-kernel-tree

modules require CRC-CCITT functions, but a module built outside

the kernel tree does. Such modules that use library CRC-CCITT

functions require M here.

config CRC16

tristate "CRC16 functions"

help

This option is provided for the case where no in-kernel-tree

modules require CRC16 functions, but a module built outside

the kernel tree does. Such modules that use library CRC16

functions require M here.

config CRC_T10DIF

tristate "CRC calculation for the T10 Data Integrity Field"

help

This option is only needed if a module that's not in the

kernel tree needs to calculate CRC checks for use with the

SCSI data integrity subsystem.

config CRC_ITU_T

tristate "CRC ITU-T V.41 functions"

help

This option is provided for the case where no in-kernel-tree

modules require CRC ITU-T V.41 functions, but a module built outside

the kernel tree does. Such modules that use library CRC ITU-T V.41

functions require M here.

config CRC32

tristate "CRC32/CRC32c functions"

default y

select BITREVERSE

help

This option is provided for the case where no in-kernel-tree

modules require CRC32/CRC32c functions, but a module built outside

the kernel tree does. Such modules that use library CRC32/CRC32c

functions require M here.

config CRC32_SELFTEST

bool "CRC32 perform self test on init"

default n

depends on CRC32

help

This option enables the CRC32 library functions to perform a

self test on initialization. The self test computes crc32_le

and crc32_be over byte strings with random alignment and length

and computes the total elapsed time and number of bytes processed.

choice

prompt "CRC32 implementation"

depends on CRC32

default CRC32_SLICEBY8

help

This option allows a kernel builder to override the default choice

of CRC32 algorithm. Choose the default ("slice by 8") unless you

know that you need one of the others.

config CRC32_SLICEBY8

bool "Slice by 8 bytes"

help

Calculate checksum 8 bytes at a time with a clever slicing algorithm.

This is the fastest algorithm, but comes with a 8KiB lookup table.

Most modern processors have enough cache to hold this table without

thrashing the cache.

This is the default implementation choice. Choose this one unless

you have a good reason not to.

config CRC32_SLICEBY4

bool "Slice by 4 bytes"

help

Calculate checksum 4 bytes at a time with a clever slicing algorithm.

This is a bit slower than slice by 8, but has a smaller 4KiB lookup

table.

Only choose this option if you know what you are doing.

config CRC32_SARWATE

bool "Sarwate's Algorithm (one byte at a time)"

help

Calculate checksum a byte at a time using Sarwate's algorithm. This

is not particularly fast, but has a small 256 byte lookup table.

Only choose this option if you know what you are doing.

config CRC32_BIT

bool "Classic Algorithm (one bit at a time)"

help

Calculate checksum one bit at a time. This is VERY slow, but has

no lookup table. This is provided as a debugging option.

Only choose this option if you are debugging crc32.

endchoice

config CRC7

tristate "CRC7 functions"

help

This option is provided for the case where no in-kernel-tree

modules require CRC7 functions, but a module built outside

the kernel tree does. Such modules that use library CRC7

functions require M here.

config LIBCRC32C

tristate "CRC32c (Castagnoli, et al) Cyclic Redundancy-Check"

select CRYPTO

select CRYPTO_CRC32C

help

This option is provided for the case where no in-kernel-tree

modules require CRC32c functions, but a module built outside the

kernel tree does. Such modules that use library CRC32c functions

require M here. See Castagnoli93.

Module will be libcrc32c.

config CRC8

tristate "CRC8 function"

help

This option provides CRC8 function. Drivers may select this

when they need to do cyclic redundancy check according CRC8

algorithm. Module will be called crc8.

config AUDIT_GENERIC

bool

depends on AUDIT && !AUDIT_ARCH

default y

#

# compression support is select'ed if needed

#

config ZLIB_INFLATE

tristate

config ZLIB_DEFLATE

tristate

config LZO_COMPRESS

tristate

config LZO_DECOMPRESS

tristate

source "lib/xz/Kconfig"

#

# These all provide a common interface (hence the apparent duplication with

# ZLIB_INFLATE; DECOMPRESS_GZIP is just a wrapper.)

#

config DECOMPRESS_GZIP

select ZLIB_INFLATE

tristate

config DECOMPRESS_BZIP2

tristate

config DECOMPRESS_LZMA

tristate

config DECOMPRESS_XZ

select XZ_DEC

tristate

config DECOMPRESS_LZO

select LZO_DECOMPRESS

tristate

#

# Generic allocator support is selected if needed

#

config GENERIC_ALLOCATOR

boolean

#

# reed solomon support is select'ed if needed

#

config REED_SOLOMON

tristate

config REED_SOLOMON_ENC8

boolean

config REED_SOLOMON_DEC8

boolean

config REED_SOLOMON_ENC16

boolean

config REED_SOLOMON_DEC16

boolean

#

# BCH support is selected if needed

#

config BCH

tristate

config BCH_CONST_PARAMS

boolean

help

Drivers may select this option to force specific constant

values for parameters 'm' (Galois field order) and 't'

(error correction capability). Those specific values must

be set by declaring default values for symbols BCH_CONST_M

and BCH_CONST_T.

Doing so will enable extra compiler optimizations,

improving encoding and decoding performance up to 2x for

usual (m,t) values (typically such that m*t < 200).

When this option is selected, the BCH library supports

only a single (m,t) configuration. This is mainly useful

for NAND flash board drivers requiring known, fixed BCH

parameters.

config BCH_CONST_M

int

range 5 15

help

Constant value for Galois field order 'm'. If 'k' is the

number of data bits to protect, 'm' should be chosen such

that (k + m*t) <= 2**m - 1.

Drivers should declare a default value for this symbol if

they select option BCH_CONST_PARAMS.

config BCH_CONST_T

int

help

Constant value for error correction capability in bits 't'.

Drivers should declare a default value for this symbol if

they select option BCH_CONST_PARAMS.

#

# Textsearch support is select'ed if needed

#

config TEXTSEARCH

boolean

config TEXTSEARCH_KMP

tristate

config TEXTSEARCH_BM

tristate

config TEXTSEARCH_FSM

tristate

config BTREE

boolean

config HAS_IOMEM

boolean

depends on !NO_IOMEM

select GENERIC_IO

default y

config HAS_IOPORT

boolean

depends on HAS_IOMEM && !NO_IOPORT

default y

config HAS_DMA

boolean

depends on !NO_DMA

default y

config CHECK_SIGNATURE

bool

config CPUMASK_OFFSTACK

bool "Force CPU masks off stack" if DEBUG_PER_CPU_MAPS

help

Use dynamic allocation for cpumask_var_t, instead of putting

them on the stack. This is a bit more expensive, but avoids

stack overflow.

config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS

bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS

depends on EXPERIMENTAL && BROKEN

config CPU_RMAP

bool

depends on SMP

config DQL

bool

#

# Netlink attribute parsing support is select'ed if needed

#

config NLATTR

bool

#

# Generic 64-bit atomic support is selected if needed

#

config GENERIC_ATOMIC64

bool

config LRU_CACHE

tristate

config AVERAGE

bool "Averaging functions"

help

This option is provided for the case where no in-kernel-tree

modules require averaging functions, but a module built outside

the kernel tree does. Such modules that use library averaging

functions require Y here.

If unsure, say N.

config CLZ_TAB

bool

config CORDIC

tristate "CORDIC algorithm"

help

This option provides an implementation of the CORDIC algorithm;

calculations are in fixed point. Module will be called cordic.

config MPILIB

tristate

select CLZ_TAB

help

Multiprecision maths library from GnuPG.

It is used to implement RSA digital signature verification,

which is used by IMA/EVM digital signature extension.

config MPILIB_EXTRA

bool

depends on MPILIB

help

Additional sources of multiprecision maths library from GnuPG.

This code is unnecessary for RSA digital signature verification,

but can be compiled if needed.

config SIGNATURE

tristate

depends on KEYS && CRYPTO

select CRYPTO_SHA1

select MPILIB

help

Digital signature verification. Currently only RSA is supported.

Implementation is done using GnuPG MPI library

endmenu