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-rw-r--r--lib/Kconfig43
1 files changed, 43 insertions, 0 deletions
diff --git a/lib/Kconfig b/lib/Kconfig
index 6d7ce4b138c4..43359bb1ca90 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -80,6 +80,49 @@ config CRC32_SELFTEST
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
+
+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