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authorDarrick J. Wong <djwong@us.ibm.com>2012-03-23 15:02:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-03-23 16:58:38 -0700
commit46c5801eaf86e83cb3a4142ad35188db5011fff0 (patch)
tree2b8a8f7709aa7dadafdf13f823488cf51e2e2fed /lib/crc32defs.h
parent78dff4189708d07cdcaf7bfd1b04ebe78ac9c041 (diff)
crc32: bolt on crc32c
Reuse the existing crc32 code to stamp out a crc32c implementation. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: Bob Pearson <rpearson@systemfabricworks.com> Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/crc32defs.h')
-rw-r--r--lib/crc32defs.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/crc32defs.h b/lib/crc32defs.h
index 818159288489..6fd191732fec 100644
--- a/lib/crc32defs.h
+++ b/lib/crc32defs.h
@@ -7,6 +7,13 @@
#define CRCPOLY_BE 0x04c11db7
/*
+ * This is the CRC32c polynomial, as outlined by Castagnoli.
+ * x^32+x^28+x^27+x^26+x^25+x^23+x^22+x^20+x^19+x^18+x^14+x^13+x^11+x^10+x^9+
+ * x^8+x^6+x^0
+ */
+#define CRC32C_POLY_LE 0x82F63B78
+
+/*
* How many bits at a time to use. Valid values are 1, 2, 4, 8, 32 and 64.
* For less performance-sensitive, use 4 or 8 to save table size.
* For larger systems choose same as CPU architecture as default.