Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * There are multiple 16-bit CRC polynomials in common use, but this is

 * *the* standard CRC-32 polynomial, first popularized by Ethernet.

 * 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

 */

#define CRCPOLY_LE 0xedb88320

#define CRCPOLY_BE 0x04c11db7

/* How many bits at a time to use.  Requires a table of 4<<CRC_xx_BITS bytes. */

/* For less performance-sensitive, use 4 */

#ifndef CRC_LE_BITS 

# define CRC_LE_BITS 8

#endif

#ifndef CRC_BE_BITS

# define CRC_BE_BITS 8

#endif

/*

 * Little-endian CRC computation.  Used with serial bit streams sent

 * lsbit-first.  Be sure to use cpu_to_le32() to append the computed CRC.

 */

#if CRC_LE_BITS > 8 || CRC_LE_BITS < 1 || CRC_LE_BITS & CRC_LE_BITS-1

# error CRC_LE_BITS must be a power of 2 between 1 and 8

#endif

/*

 * Big-endian CRC computation.  Used with serial bit streams sent

 * msbit-first.  Be sure to use cpu_to_be32() to append the computed CRC.

 */

#if CRC_BE_BITS > 8 || CRC_BE_BITS < 1 || CRC_BE_BITS & CRC_BE_BITS-1

# error CRC_BE_BITS must be a power of 2 between 1 and 8

#endif