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Architecture:  x86 m68k m68knommu mips powerpc sh blackfin

Linux/lib/crc32defs.h

  1 /*
  2  * There are multiple 16-bit CRC polynomials in common use, but this is
  3  * *the* standard CRC-32 polynomial, first popularized by Ethernet.
  4  * x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x^1+x^0
  5  */
  6 #define CRCPOLY_LE 0xedb88320
  7 #define CRCPOLY_BE 0x04c11db7
  8 
  9 /* How many bits at a time to use.  Requires a table of 4<<CRC_xx_BITS bytes. */
 10 /* For less performance-sensitive, use 4 */
 11 #ifndef CRC_LE_BITS 
 12 # define CRC_LE_BITS 8
 13 #endif
 14 #ifndef CRC_BE_BITS
 15 # define CRC_BE_BITS 8
 16 #endif
 17 
 18 /*
 19  * Little-endian CRC computation.  Used with serial bit streams sent
 20  * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.
 21  */
 22 #if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1
 23 # error CRC_LE_BITS must be a power of 2 between 1 and 8
 24 #endif
 25 
 26 /*
 27  * Big-endian CRC computation.  Used with serial bit streams sent
 28  * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.
 29  */
 30 #if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1
 31 # error CRC_BE_BITS must be a power of 2 between 1 and 8
 32 #endif
 33

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