crc32.c 45.4 KB
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/*
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 * Aug 8, 2011 Bob Pearson with help from Joakim Tjernlund and George Spelvin
 * cleaned up code to current version of sparse and added the slicing-by-8
 * algorithm to the closely similar existing slicing-by-4 algorithm.
 *
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 * Oct 15, 2000 Matt Domsch <Matt_Domsch@dell.com>
 * Nicer crc32 functions/docs submitted by linux@horizon.com.  Thanks!
 * Code was from the public domain, copyright abandoned.  Code was
 * subsequently included in the kernel, thus was re-licensed under the
 * GNU GPL v2.
 *
 * Oct 12, 2000 Matt Domsch <Matt_Domsch@dell.com>
 * Same crc32 function was used in 5 other places in the kernel.
 * I made one version, and deleted the others.
 * There are various incantations of crc32().  Some use a seed of 0 or ~0.
 * Some xor at the end with ~0.  The generic crc32() function takes
 * seed as an argument, and doesn't xor at the end.  Then individual
 * users can do whatever they need.
 *   drivers/net/smc9194.c uses seed ~0, doesn't xor with ~0.
 *   fs/jffs2 uses seed 0, doesn't xor with ~0.
 *   fs/partitions/efi.c uses seed ~0, xor's with ~0.
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2.  See the file COPYING for more details.
 */

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/* see: Documentation/crc32.txt for a description of algorithms */

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#include <linux/crc32.h>
#include <linux/module.h>
#include <linux/types.h>
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#include <linux/sched.h>
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#include "crc32defs.h"
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#if CRC_LE_BITS > 8
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# define tole(x) ((__force u32) cpu_to_le32(x))
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#else
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# define tole(x) (x)
#endif

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#if CRC_BE_BITS > 8
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# define tobe(x) ((__force u32) cpu_to_be32(x))
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#else
# define tobe(x) (x)
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#endif
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#include "crc32table.h"

MODULE_AUTHOR("Matt Domsch <Matt_Domsch@dell.com>");
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MODULE_DESCRIPTION("Various CRC32 calculations");
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MODULE_LICENSE("GPL");

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#if CRC_LE_BITS > 8 || CRC_BE_BITS > 8
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/* implements slicing-by-4 or slicing-by-8 algorithm */
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static inline u32
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crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
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{
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# ifdef __LITTLE_ENDIAN
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#  define DO_CRC(x) crc = t0[(crc ^ (x)) & 255] ^ (crc >> 8)
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#  define DO_CRC4 (t3[(q) & 255] ^ t2[(q >> 8) & 255] ^ \
		   t1[(q >> 16) & 255] ^ t0[(q >> 24) & 255])
#  define DO_CRC8 (t7[(q) & 255] ^ t6[(q >> 8) & 255] ^ \
		   t5[(q >> 16) & 255] ^ t4[(q >> 24) & 255])
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# else
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#  define DO_CRC(x) crc = t0[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)
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#  define DO_CRC4 (t0[(q) & 255] ^ t1[(q >> 8) & 255] ^ \
		   t2[(q >> 16) & 255] ^ t3[(q >> 24) & 255])
#  define DO_CRC8 (t4[(q) & 255] ^ t5[(q >> 8) & 255] ^ \
		   t6[(q >> 16) & 255] ^ t7[(q >> 24) & 255])
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# endif
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	const u32 *b;
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	size_t    rem_len;
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# ifdef CONFIG_X86
	size_t i;
# endif
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	const u32 *t0=tab[0], *t1=tab[1], *t2=tab[2], *t3=tab[3];
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# if CRC_LE_BITS != 32
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	const u32 *t4 = tab[4], *t5 = tab[5], *t6 = tab[6], *t7 = tab[7];
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# endif
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	u32 q;
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	/* Align it */
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	if (unlikely((long)buf & 3 && len)) {
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		do {
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			DO_CRC(*buf++);
		} while ((--len) && ((long)buf)&3);
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	}
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# if CRC_LE_BITS == 32
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	rem_len = len & 3;
	len = len >> 2;
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# else
	rem_len = len & 7;
	len = len >> 3;
# endif

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	b = (const u32 *)buf;
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# ifdef CONFIG_X86
	--b;
	for (i = 0; i < len; i++) {
# else
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	for (--b; len; --len) {
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# endif
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		q = crc ^ *++b; /* use pre increment for speed */
# if CRC_LE_BITS == 32
		crc = DO_CRC4;
# else
		crc = DO_CRC8;
		q = *++b;
		crc ^= DO_CRC4;
# endif
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	}
	len = rem_len;
	/* And the last few bytes */
	if (len) {
		u8 *p = (u8 *)(b + 1) - 1;
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# ifdef CONFIG_X86
		for (i = 0; i < len; i++)
			DO_CRC(*++p); /* use pre increment for speed */
# else
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		do {
			DO_CRC(*++p); /* use pre increment for speed */
		} while (--len);
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# endif
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	}
	return crc;
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#undef DO_CRC
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#undef DO_CRC4
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#undef DO_CRC8
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}
#endif
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/**
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 * crc32_le_generic() - Calculate bitwise little-endian Ethernet AUTODIN II
 *			CRC32/CRC32C
 * @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for other
 *	 uses, or the previous crc32/crc32c value if computing incrementally.
 * @p: pointer to buffer over which CRC32/CRC32C is run
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 * @len: length of buffer @p
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 * @tab: little-endian Ethernet table
 * @polynomial: CRC32/CRC32c LE polynomial
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 */
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static inline u32 __pure crc32_le_generic(u32 crc, unsigned char const *p,
					  size_t len, const u32 (*tab)[256],
					  u32 polynomial)
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{
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#if CRC_LE_BITS == 1
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	int i;
	while (len--) {
		crc ^= *p++;
		for (i = 0; i < 8; i++)
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			crc = (crc >> 1) ^ ((crc & 1) ? polynomial : 0);
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	}
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# elif CRC_LE_BITS == 2
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	while (len--) {
		crc ^= *p++;
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		crc = (crc >> 2) ^ tab[0][crc & 3];
		crc = (crc >> 2) ^ tab[0][crc & 3];
		crc = (crc >> 2) ^ tab[0][crc & 3];
		crc = (crc >> 2) ^ tab[0][crc & 3];
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	}
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# elif CRC_LE_BITS == 4
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	while (len--) {
		crc ^= *p++;
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		crc = (crc >> 4) ^ tab[0][crc & 15];
		crc = (crc >> 4) ^ tab[0][crc & 15];
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	}
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# elif CRC_LE_BITS == 8
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	/* aka Sarwate algorithm */
	while (len--) {
		crc ^= *p++;
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		crc = (crc >> 8) ^ tab[0][crc & 255];
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	}
# else
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	crc = (__force u32) __cpu_to_le32(crc);
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	crc = crc32_body(crc, p, len, tab);
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	crc = __le32_to_cpu((__force __le32)crc);
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#endif
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	return crc;
}
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#if CRC_LE_BITS == 1
u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
{
	return crc32_le_generic(crc, p, len, NULL, CRCPOLY_LE);
}
u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
{
	return crc32_le_generic(crc, p, len, NULL, CRC32C_POLY_LE);
}
#else
u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len)
{
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	return crc32_le_generic(crc, p, len,
			(const u32 (*)[256])crc32table_le, CRCPOLY_LE);
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}
u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len)
{
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	return crc32_le_generic(crc, p, len,
			(const u32 (*)[256])crc32ctable_le, CRC32C_POLY_LE);
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}
#endif
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EXPORT_SYMBOL(crc32_le);
EXPORT_SYMBOL(__crc32c_le);

/*
 * This multiplies the polynomials x and y modulo the given modulus.
 * This follows the "little-endian" CRC convention that the lsbit
 * represents the highest power of x, and the msbit represents x^0.
 */
static u32 __attribute_const__ gf2_multiply(u32 x, u32 y, u32 modulus)
{
	u32 product = x & 1 ? y : 0;
	int i;

	for (i = 0; i < 31; i++) {
		product = (product >> 1) ^ (product & 1 ? modulus : 0);
		x >>= 1;
		product ^= x & 1 ? y : 0;
	}

	return product;
}

/**
 * crc32_generic_shift - Append len 0 bytes to crc, in logarithmic time
 * @crc: The original little-endian CRC (i.e. lsbit is x^31 coefficient)
 * @len: The number of bytes. @crc is multiplied by x^(8*@len)
 * @polynomial: The modulus used to reduce the result to 32 bits.
 *
 * It's possible to parallelize CRC computations by computing a CRC
 * over separate ranges of a buffer, then summing them.
 * This shifts the given CRC by 8*len bits (i.e. produces the same effect
 * as appending len bytes of zero to the data), in time proportional
 * to log(len).
 */
static u32 __attribute_const__ crc32_generic_shift(u32 crc, size_t len,
						   u32 polynomial)
{
	u32 power = polynomial;	/* CRC of x^32 */
	int i;

	/* Shift up to 32 bits in the simple linear way */
	for (i = 0; i < 8 * (int)(len & 3); i++)
		crc = (crc >> 1) ^ (crc & 1 ? polynomial : 0);

	len >>= 2;
	if (!len)
		return crc;

	for (;;) {
		/* "power" is x^(2^i), modulo the polynomial */
		if (len & 1)
			crc = gf2_multiply(crc, power, polynomial);

		len >>= 1;
		if (!len)
			break;

		/* Square power, advancing to x^(2^(i+1)) */
		power = gf2_multiply(power, power, polynomial);
	}

	return crc;
}

u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len)
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{
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	return crc32_generic_shift(crc, len, CRCPOLY_LE);
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}

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u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len)
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{
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	return crc32_generic_shift(crc, len, CRC32C_POLY_LE);
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}
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EXPORT_SYMBOL(crc32_le_shift);
EXPORT_SYMBOL(__crc32c_le_shift);
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/**
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 * crc32_be_generic() - Calculate bitwise big-endian Ethernet AUTODIN II CRC32
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 * @crc: seed value for computation.  ~0 for Ethernet, sometimes 0 for
 *	other uses, or the previous crc32 value if computing incrementally.
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 * @p: pointer to buffer over which CRC32 is run
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 * @len: length of buffer @p
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 * @tab: big-endian Ethernet table
 * @polynomial: CRC32 BE polynomial
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 */
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static inline u32 __pure crc32_be_generic(u32 crc, unsigned char const *p,
					  size_t len, const u32 (*tab)[256],
					  u32 polynomial)
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{
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#if CRC_BE_BITS == 1
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	int i;
	while (len--) {
		crc ^= *p++ << 24;
		for (i = 0; i < 8; i++)
			crc =
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			    (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
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					  0);
	}
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# elif CRC_BE_BITS == 2
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	while (len--) {
		crc ^= *p++ << 24;
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		crc = (crc << 2) ^ tab[0][crc >> 30];
		crc = (crc << 2) ^ tab[0][crc >> 30];
		crc = (crc << 2) ^ tab[0][crc >> 30];
		crc = (crc << 2) ^ tab[0][crc >> 30];
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	}
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# elif CRC_BE_BITS == 4
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	while (len--) {
		crc ^= *p++ << 24;
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		crc = (crc << 4) ^ tab[0][crc >> 28];
		crc = (crc << 4) ^ tab[0][crc >> 28];
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	}
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# elif CRC_BE_BITS == 8
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	while (len--) {
		crc ^= *p++ << 24;
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		crc = (crc << 8) ^ tab[0][crc >> 24];
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	}
# else
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	crc = (__force u32) __cpu_to_be32(crc);
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	crc = crc32_body(crc, p, len, tab);
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	crc = __be32_to_cpu((__force __be32)crc);
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# endif
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	return crc;
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}
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#if CRC_LE_BITS == 1
u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
{
	return crc32_be_generic(crc, p, len, NULL, CRCPOLY_BE);
}
#else
u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len)
{
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	return crc32_be_generic(crc, p, len,
			(const u32 (*)[256])crc32table_be, CRCPOLY_BE);
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}
#endif
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EXPORT_SYMBOL(crc32_be);

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#ifdef CONFIG_CRC32_SELFTEST
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/* 4096 random bytes */
static u8 __attribute__((__aligned__(8))) test_buf[] =
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{
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	0x5b, 0x85, 0x21, 0xcb, 0x09, 0x68, 0x7d, 0x30,
	0xc7, 0x69, 0xd7, 0x30, 0x92, 0xde, 0x59, 0xe4,
	0xc9, 0x6e, 0x8b, 0xdb, 0x98, 0x6b, 0xaa, 0x60,
	0xa8, 0xb5, 0xbc, 0x6c, 0xa9, 0xb1, 0x5b, 0x2c,
	0xea, 0xb4, 0x92, 0x6a, 0x3f, 0x79, 0x91, 0xe4,
	0xe9, 0x70, 0x51, 0x8c, 0x7f, 0x95, 0x6f, 0x1a,
	0x56, 0xa1, 0x5c, 0x27, 0x03, 0x67, 0x9f, 0x3a,
	0xe2, 0x31, 0x11, 0x29, 0x6b, 0x98, 0xfc, 0xc4,
	0x53, 0x24, 0xc5, 0x8b, 0xce, 0x47, 0xb2, 0xb9,
	0x32, 0xcb, 0xc1, 0xd0, 0x03, 0x57, 0x4e, 0xd4,
	0xe9, 0x3c, 0xa1, 0x63, 0xcf, 0x12, 0x0e, 0xca,
	0xe1, 0x13, 0xd1, 0x93, 0xa6, 0x88, 0x5c, 0x61,
	0x5b, 0xbb, 0xf0, 0x19, 0x46, 0xb4, 0xcf, 0x9e,
	0xb6, 0x6b, 0x4c, 0x3a, 0xcf, 0x60, 0xf9, 0x7a,
	0x8d, 0x07, 0x63, 0xdb, 0x40, 0xe9, 0x0b, 0x6f,
	0xad, 0x97, 0xf1, 0xed, 0xd0, 0x1e, 0x26, 0xfd,
	0xbf, 0xb7, 0xc8, 0x04, 0x94, 0xf8, 0x8b, 0x8c,
	0xf1, 0xab, 0x7a, 0xd4, 0xdd, 0xf3, 0xe8, 0x88,
	0xc3, 0xed, 0x17, 0x8a, 0x9b, 0x40, 0x0d, 0x53,
	0x62, 0x12, 0x03, 0x5f, 0x1b, 0x35, 0x32, 0x1f,
	0xb4, 0x7b, 0x93, 0x78, 0x0d, 0xdb, 0xce, 0xa4,
	0xc0, 0x47, 0xd5, 0xbf, 0x68, 0xe8, 0x5d, 0x74,
	0x8f, 0x8e, 0x75, 0x1c, 0xb2, 0x4f, 0x9a, 0x60,
	0xd1, 0xbe, 0x10, 0xf4, 0x5c, 0xa1, 0x53, 0x09,
	0xa5, 0xe0, 0x09, 0x54, 0x85, 0x5c, 0xdc, 0x07,
	0xe7, 0x21, 0x69, 0x7b, 0x8a, 0xfd, 0x90, 0xf1,
	0x22, 0xd0, 0xb4, 0x36, 0x28, 0xe6, 0xb8, 0x0f,
	0x39, 0xde, 0xc8, 0xf3, 0x86, 0x60, 0x34, 0xd2,
	0x5e, 0xdf, 0xfd, 0xcf, 0x0f, 0xa9, 0x65, 0xf0,
	0xd5, 0x4d, 0x96, 0x40, 0xe3, 0xdf, 0x3f, 0x95,
	0x5a, 0x39, 0x19, 0x93, 0xf4, 0x75, 0xce, 0x22,
	0x00, 0x1c, 0x93, 0xe2, 0x03, 0x66, 0xf4, 0x93,
	0x73, 0x86, 0x81, 0x8e, 0x29, 0x44, 0x48, 0x86,
	0x61, 0x7c, 0x48, 0xa3, 0x43, 0xd2, 0x9c, 0x8d,
	0xd4, 0x95, 0xdd, 0xe1, 0x22, 0x89, 0x3a, 0x40,
	0x4c, 0x1b, 0x8a, 0x04, 0xa8, 0x09, 0x69, 0x8b,
	0xea, 0xc6, 0x55, 0x8e, 0x57, 0xe6, 0x64, 0x35,
	0xf0, 0xc7, 0x16, 0x9f, 0x5d, 0x5e, 0x86, 0x40,
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	0xae, 0xf9, 0x9e, 0xb7, 0xb4, 0xb0, 0x91, 0x5f,
	0x16, 0x35, 0x9a, 0x11, 0xb8, 0xc7, 0xc1, 0x8c,
	0xc6, 0x10, 0x8d, 0x2f, 0x63, 0x4a, 0xa7, 0x57,
	0x3a, 0x51, 0xd6, 0x32, 0x2d, 0x64, 0x72, 0xd4,
	0x66, 0xdc, 0x10, 0xa6, 0x67, 0xd6, 0x04, 0x23,
	0x9d, 0x0a, 0x11, 0x77, 0xdd, 0x37, 0x94, 0x17,
	0x3c, 0xbf, 0x8b, 0x65, 0xb0, 0x2e, 0x5e, 0x66,
	0x47, 0x64, 0xac, 0xdd, 0xf0, 0x84, 0xfd, 0x39,
	0xfa, 0x15, 0x5d, 0xef, 0xae, 0xca, 0xc1, 0x36,
	0xa7, 0x5c, 0xbf, 0xc7, 0x08, 0xc2, 0x66, 0x00,
	0x74, 0x74, 0x4e, 0x27, 0x3f, 0x55, 0x8a, 0xb7,
	0x38, 0x66, 0x83, 0x6d, 0xcf, 0x99, 0x9e, 0x60,
	0x8f, 0xdd, 0x2e, 0x62, 0x22, 0x0e, 0xef, 0x0c,
	0x98, 0xa7, 0x85, 0x74, 0x3b, 0x9d, 0xec, 0x9e,
	0xa9, 0x19, 0x72, 0xa5, 0x7f, 0x2c, 0x39, 0xb7,
	0x7d, 0xb7, 0xf1, 0x12, 0x65, 0x27, 0x4b, 0x5a,
	0xde, 0x17, 0xfe, 0xad, 0x44, 0xf3, 0x20, 0x4d,
	0xfd, 0xe4, 0x1f, 0xb5, 0x81, 0xb0, 0x36, 0x37,
	0x08, 0x6f, 0xc3, 0x0c, 0xe9, 0x85, 0x98, 0x82,
	0xa9, 0x62, 0x0c, 0xc4, 0x97, 0xc0, 0x50, 0xc8,
	0xa7, 0x3c, 0x50, 0x9f, 0x43, 0xb9, 0xcd, 0x5e,
	0x4d, 0xfa, 0x1c, 0x4b, 0x0b, 0xa9, 0x98, 0x85,
	0x38, 0x92, 0xac, 0x8d, 0xe4, 0xad, 0x9b, 0x98,
	0xab, 0xd9, 0x38, 0xac, 0x62, 0x52, 0xa3, 0x22,
	0x63, 0x0f, 0xbf, 0x95, 0x48, 0xdf, 0x69, 0xe7,
	0x8b, 0x33, 0xd5, 0xb2, 0xbd, 0x05, 0x49, 0x49,
	0x9d, 0x57, 0x73, 0x19, 0x33, 0xae, 0xfa, 0x33,
	0xf1, 0x19, 0xa8, 0x80, 0xce, 0x04, 0x9f, 0xbc,
	0x1d, 0x65, 0x82, 0x1b, 0xe5, 0x3a, 0x51, 0xc8,
	0x1c, 0x21, 0xe3, 0x5d, 0xf3, 0x7d, 0x9b, 0x2f,
	0x2c, 0x1d, 0x4a, 0x7f, 0x9b, 0x68, 0x35, 0xa3,
	0xb2, 0x50, 0xf7, 0x62, 0x79, 0xcd, 0xf4, 0x98,
	0x4f, 0xe5, 0x63, 0x7c, 0x3e, 0x45, 0x31, 0x8c,
	0x16, 0xa0, 0x12, 0xc8, 0x58, 0xce, 0x39, 0xa6,
	0xbc, 0x54, 0xdb, 0xc5, 0xe0, 0xd5, 0xba, 0xbc,
	0xb9, 0x04, 0xf4, 0x8d, 0xe8, 0x2f, 0x15, 0x9d,
};

/* 100 test cases */
static struct crc_test {
	u32 crc;	/* random starting crc */
	u32 start;	/* random 6 bit offset in buf */
	u32 length;	/* random 11 bit length of test */
	u32 crc_le;	/* expected crc32_le result */
	u32 crc_be;	/* expected crc32_be result */
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	u32 crc32c_le;	/* expected crc32c_le result */
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} test[] =
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{
873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
	{0x674bf11d, 0x00000038, 0x00000542, 0x0af6d466, 0xd8b6e4c1, 0xf6e93d6c},
	{0x35c672c6, 0x0000003a, 0x000001aa, 0xc6d3dfba, 0x28aaf3ad, 0x0fe92aca},
	{0x496da28e, 0x00000039, 0x000005af, 0xd933660f, 0x5d57e81f, 0x52e1ebb8},
	{0x09a9b90e, 0x00000027, 0x000001f8, 0xb45fe007, 0xf45fca9a, 0x0798af9a},
	{0xdc97e5a9, 0x00000025, 0x000003b6, 0xf81a3562, 0xe0126ba2, 0x18eb3152},
	{0x47c58900, 0x0000000a, 0x000000b9, 0x8e58eccf, 0xf3afc793, 0xd00d08c7},
	{0x292561e8, 0x0000000c, 0x00000403, 0xa2ba8aaf, 0x0b797aed, 0x8ba966bc},
	{0x415037f6, 0x00000003, 0x00000676, 0xa17d52e8, 0x7f0fdf35, 0x11d694a2},
	{0x3466e707, 0x00000026, 0x00000042, 0x258319be, 0x75c484a2, 0x6ab3208d},
	{0xafd1281b, 0x00000023, 0x000002ee, 0x4428eaf8, 0x06c7ad10, 0xba4603c5},
	{0xd3857b18, 0x00000028, 0x000004a2, 0x5c430821, 0xb062b7cb, 0xe6071c6f},
	{0x1d825a8f, 0x0000002b, 0x0000050b, 0xd2c45f0c, 0xd68634e0, 0x179ec30a},
	{0x5033e3bc, 0x0000000b, 0x00000078, 0xa3ea4113, 0xac6d31fb, 0x0903beb8},
	{0x94f1fb5e, 0x0000000f, 0x000003a2, 0xfbfc50b1, 0x3cfe50ed, 0x6a7cb4fa},
	{0xc9a0fe14, 0x00000009, 0x00000473, 0x5fb61894, 0x87070591, 0xdb535801},
	{0x88a034b1, 0x0000001c, 0x000005ad, 0xc1b16053, 0x46f95c67, 0x92bed597},
	{0xf0f72239, 0x00000020, 0x0000026d, 0xa6fa58f3, 0xf8c2c1dd, 0x192a3f1b},
	{0xcc20a5e3, 0x0000003b, 0x0000067a, 0x7740185a, 0x308b979a, 0xccbaec1a},
	{0xce589c95, 0x0000002b, 0x00000641, 0xd055e987, 0x40aae25b, 0x7eabae4d},
	{0x78edc885, 0x00000035, 0x000005be, 0xa39cb14b, 0x035b0d1f, 0x28c72982},
	{0x9d40a377, 0x0000003b, 0x00000038, 0x1f47ccd2, 0x197fbc9d, 0xc3cd4d18},
	{0x703d0e01, 0x0000003c, 0x000006f1, 0x88735e7c, 0xfed57c5a, 0xbca8f0e7},
	{0x776bf505, 0x0000000f, 0x000005b2, 0x5cc4fc01, 0xf32efb97, 0x713f60b3},
	{0x4a3e7854, 0x00000027, 0x000004b8, 0x8d923c82, 0x0cbfb4a2, 0xebd08fd5},
	{0x209172dd, 0x0000003b, 0x00000356, 0xb89e9c2b, 0xd7868138, 0x64406c59},
	{0x3ba4cc5b, 0x0000002f, 0x00000203, 0xe51601a9, 0x5b2a1032, 0x7421890e},
	{0xfc62f297, 0x00000000, 0x00000079, 0x71a8e1a2, 0x5d88685f, 0xe9347603},
	{0x64280b8b, 0x00000016, 0x000007ab, 0x0fa7a30c, 0xda3a455f, 0x1bef9060},
	{0x97dd724b, 0x00000033, 0x000007ad, 0x5788b2f4, 0xd7326d32, 0x34720072},
	{0x61394b52, 0x00000035, 0x00000571, 0xc66525f1, 0xcabe7fef, 0x48310f59},
	{0x29b4faff, 0x00000024, 0x0000006e, 0xca13751e, 0x993648e0, 0x783a4213},
	{0x29bfb1dc, 0x0000000b, 0x00000244, 0x436c43f7, 0x429f7a59, 0x9e8efd41},
	{0x86ae934b, 0x00000035, 0x00000104, 0x0760ec93, 0x9cf7d0f4, 0xfc3d34a5},
	{0xc4c1024e, 0x0000002e, 0x000006b1, 0x6516a3ec, 0x19321f9c, 0x17a52ae2},
	{0x3287a80a, 0x00000026, 0x00000496, 0x0b257eb1, 0x754ebd51, 0x886d935a},
	{0xa4db423e, 0x00000023, 0x0000045d, 0x9b3a66dc, 0x873e9f11, 0xeaaeaeb2},
	{0x7a1078df, 0x00000015, 0x0000014a, 0x8c2484c5, 0x6a628659, 0x8e900a4b},
	{0x6048bd5b, 0x00000006, 0x0000006a, 0x897e3559, 0xac9961af, 0xd74662b1},
	{0xd8f9ea20, 0x0000003d, 0x00000277, 0x60eb905b, 0xed2aaf99, 0xd26752ba},
	{0xea5ec3b4, 0x0000002a, 0x000004fe, 0x869965dc, 0x6c1f833b, 0x8b1fcd62},
	{0x2dfb005d, 0x00000016, 0x00000345, 0x6a3b117e, 0xf05e8521, 0xf54342fe},
	{0x5a214ade, 0x00000020, 0x000005b6, 0x467f70be, 0xcb22ccd3, 0x5b95b988},
	{0xf0ab9cca, 0x00000032, 0x00000515, 0xed223df3, 0x7f3ef01d, 0x2e1176be},
	{0x91b444f9, 0x0000002e, 0x000007f8, 0x84e9a983, 0x5676756f, 0x66120546},
	{0x1b5d2ddb, 0x0000002e, 0x0000012c, 0xba638c4c, 0x3f42047b, 0xf256a5cc},
	{0xd824d1bb, 0x0000003a, 0x000007b5, 0x6288653b, 0x3a3ebea0, 0x4af1dd69},
	{0x0470180c, 0x00000034, 0x000001f0, 0x9d5b80d6, 0x3de08195, 0x56f0a04a},
	{0xffaa3a3f, 0x00000036, 0x00000299, 0xf3a82ab8, 0x53e0c13d, 0x74f6b6b2},
	{0x6406cfeb, 0x00000023, 0x00000600, 0xa920b8e8, 0xe4e2acf4, 0x085951fd},
	{0xb24aaa38, 0x0000003e, 0x000004a1, 0x657cc328, 0x5077b2c3, 0xc65387eb},
	{0x58b2ab7c, 0x00000039, 0x000002b4, 0x3a17ee7e, 0x9dcb3643, 0x1ca9257b},
	{0x3db85970, 0x00000006, 0x000002b6, 0x95268b59, 0xb9812c10, 0xfd196d76},
	{0x857830c5, 0x00000003, 0x00000590, 0x4ef439d5, 0xf042161d, 0x5ef88339},
	{0xe1fcd978, 0x0000003e, 0x000007d8, 0xae8d8699, 0xce0a1ef5, 0x2c3714d9},
	{0xb982a768, 0x00000016, 0x000006e0, 0x62fad3df, 0x5f8a067b, 0x58576548},
	{0x1d581ce8, 0x0000001e, 0x0000058b, 0xf0f5da53, 0x26e39eee, 0xfd7c57de},
	{0x2456719b, 0x00000025, 0x00000503, 0x4296ac64, 0xd50e4c14, 0xd5fedd59},
	{0xfae6d8f2, 0x00000000, 0x0000055d, 0x057fdf2e, 0x2a31391a, 0x1cc3b17b},
	{0xcba828e3, 0x00000039, 0x000002ce, 0xe3f22351, 0x8f00877b, 0x270eed73},
	{0x13d25952, 0x0000000a, 0x0000072d, 0x76d4b4cc, 0x5eb67ec3, 0x91ecbb11},
	{0x0342be3f, 0x00000015, 0x00000599, 0xec75d9f1, 0x9d4d2826, 0x05ed8d0c},
	{0xeaa344e0, 0x00000014, 0x000004d8, 0x72a4c981, 0x2064ea06, 0x0b09ad5b},
	{0xbbb52021, 0x0000003b, 0x00000272, 0x04af99fc, 0xaf042d35, 0xf8d511fb},
	{0xb66384dc, 0x0000001d, 0x000007fc, 0xd7629116, 0x782bd801, 0x5ad832cc},
	{0x616c01b6, 0x00000022, 0x000002c8, 0x5b1dab30, 0x783ce7d2, 0x1214d196},
	{0xce2bdaad, 0x00000016, 0x0000062a, 0x932535c8, 0x3f02926d, 0x5747218a},
	{0x00fe84d7, 0x00000005, 0x00000205, 0x850e50aa, 0x753d649c, 0xde8f14de},
	{0xbebdcb4c, 0x00000006, 0x0000055d, 0xbeaa37a2, 0x2d8c9eba, 0x3563b7b9},
	{0xd8b1a02a, 0x00000010, 0x00000387, 0x5017d2fc, 0x503541a5, 0x071475d0},
	{0x3b96cad2, 0x00000036, 0x00000347, 0x1d2372ae, 0x926cd90b, 0x54c79d60},
	{0xc94c1ed7, 0x00000005, 0x0000038b, 0x9e9fdb22, 0x144a9178, 0x4c53eee6},
	{0x1aad454e, 0x00000025, 0x000002b2, 0xc3f6315c, 0x5c7a35b3, 0x10137a3c},
	{0xa4fec9a6, 0x00000000, 0x000006d6, 0x90be5080, 0xa4107605, 0xaa9d6c73},
	{0x1bbe71e2, 0x0000001f, 0x000002fd, 0x4e504c3b, 0x284ccaf1, 0xb63d23e7},
	{0x4201c7e4, 0x00000002, 0x000002b7, 0x7822e3f9, 0x0cc912a9, 0x7f53e9cf},
	{0x23fddc96, 0x00000003, 0x00000627, 0x8a385125, 0x07767e78, 0x13c1cd83},
	{0xd82ba25c, 0x00000016, 0x0000063e, 0x98e4148a, 0x283330c9, 0x49ff5867},
	{0x786f2032, 0x0000002d, 0x0000060f, 0xf201600a, 0xf561bfcd, 0x8467f211},
	{0xfebe4e1f, 0x0000002a, 0x000004f2, 0x95e51961, 0xfd80dcab, 0x3f9683b2},
	{0x1a6e0a39, 0x00000008, 0x00000672, 0x8af6c2a5, 0x78dd84cb, 0x76a3f874},
	{0x56000ab8, 0x0000000e, 0x000000e5, 0x36bacb8f, 0x22ee1f77, 0x863b702f},
	{0x4717fe0c, 0x00000000, 0x000006ec, 0x8439f342, 0x5c8e03da, 0xdc6c58ff},
	{0xd5d5d68e, 0x0000003c, 0x000003a3, 0x46fff083, 0x177d1b39, 0x0622cc95},
	{0xc25dd6c6, 0x00000024, 0x000006c0, 0x5ceb8eb4, 0x892b0d16, 0xe85605cd},
	{0xe9b11300, 0x00000023, 0x00000683, 0x07a5d59a, 0x6c6a3208, 0x31da5f06},
	{0x95cd285e, 0x00000001, 0x00000047, 0x7b3a4368, 0x0202c07e, 0xa1f2e784},
	{0xd9245a25, 0x0000001e, 0x000003a6, 0xd33c1841, 0x1936c0d5, 0xb07cc616},
	{0x103279db, 0x00000006, 0x0000039b, 0xca09b8a0, 0x77d62892, 0xbf943b6c},
	{0x1cba3172, 0x00000027, 0x000001c8, 0xcb377194, 0xebe682db, 0x2c01af1c},
	{0x8f613739, 0x0000000c, 0x000001df, 0xb4b0bc87, 0x7710bd43, 0x0fe5f56d},
	{0x1c6aa90d, 0x0000001b, 0x0000053c, 0x70559245, 0xda7894ac, 0xf8943b2d},
	{0xaabe5b93, 0x0000003d, 0x00000715, 0xcdbf42fa, 0x0c3b99e7, 0xe4d89272},
	{0xf15dd038, 0x00000006, 0x000006db, 0x6e104aea, 0x8d5967f2, 0x7c2f6bbb},
	{0x584dd49c, 0x00000020, 0x000007bc, 0x36b6cfd6, 0xad4e23b2, 0xabbf388b},
	{0x5d8c9506, 0x00000020, 0x00000470, 0x4c62378e, 0x31d92640, 0x1dca1f4e},
	{0xb80d17b0, 0x00000032, 0x00000346, 0x22a5bb88, 0x9a7ec89f, 0x5c170e23},
	{0xdaf0592e, 0x00000023, 0x000007b0, 0x3cab3f99, 0x9b1fdd99, 0xc0e9d672},
	{0x4793cc85, 0x0000000d, 0x00000706, 0xe82e04f6, 0xed3db6b7, 0xc18bdc86},
	{0x82ebf64e, 0x00000009, 0x000007c3, 0x69d590a9, 0x9efa8499, 0xa874fcdd},
	{0xb18a0319, 0x00000026, 0x000007db, 0x1cf98dcc, 0x8fa9ad6a, 0x9dc0bb48},
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};

#include <linux/time.h>

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static int __init crc32c_test(void)
{
	int i;
	int errors = 0;
	int bytes = 0;
	struct timespec start, stop;
	u64 nsec;
	unsigned long flags;

	/* keep static to prevent cache warming code from
	 * getting eliminated by the compiler */
	static u32 crc;

	/* pre-warm the cache */
	for (i = 0; i < 100; i++) {
		bytes += 2*test[i].length;

		crc ^= __crc32c_le(test[i].crc, test_buf +
		    test[i].start, test[i].length);
	}

	/* reduce OS noise */
	local_irq_save(flags);
	local_irq_disable();

	getnstimeofday(&start);
	for (i = 0; i < 100; i++) {
		if (test[i].crc32c_le != __crc32c_le(test[i].crc, test_buf +
		    test[i].start, test[i].length))
			errors++;
	}
	getnstimeofday(&stop);

	local_irq_restore(flags);
	local_irq_enable();

	nsec = stop.tv_nsec - start.tv_nsec +
		1000000000 * (stop.tv_sec - start.tv_sec);

	pr_info("crc32c: CRC_LE_BITS = %d\n", CRC_LE_BITS);

	if (errors)
		pr_warn("crc32c: %d self tests failed\n", errors);
	else {
		pr_info("crc32c: self tests passed, processed %d bytes in %lld nsec\n",
			bytes, nsec);
	}

	return 0;
}

1028 1029 1030 1031 1032
static int __init crc32c_combine_test(void)
{
	int i, j;
	int errors = 0, runs = 0;

1033
	for (i = 0; i < 10; i++) {
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050
		u32 crc_full;

		crc_full = __crc32c_le(test[i].crc, test_buf + test[i].start,
				       test[i].length);
		for (j = 0; j <= test[i].length; ++j) {
			u32 crc1, crc2;
			u32 len1 = j, len2 = test[i].length - j;

			crc1 = __crc32c_le(test[i].crc, test_buf +
					   test[i].start, len1);
			crc2 = __crc32c_le(0, test_buf + test[i].start +
					   len1, len2);

			if (!(crc_full == __crc32c_le_combine(crc1, crc2, len2) &&
			      crc_full == test[i].crc32c_le))
				errors++;
			runs++;
1051
			cond_resched();
1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062
		}
	}

	if (errors)
		pr_warn("crc32c_combine: %d/%d self tests failed\n", errors, runs);
	else
		pr_info("crc32c_combine: %d self tests passed\n", runs);

	return 0;
}

1063
static int __init crc32_test(void)
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{
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	int i;
	int errors = 0;
	int bytes = 0;
	struct timespec start, stop;
	u64 nsec;
	unsigned long flags;
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	/* keep static to prevent cache warming code from
	 * getting eliminated by the compiler */
	static u32 crc;
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	/* pre-warm the cache */
	for (i = 0; i < 100; i++) {
		bytes += 2*test[i].length;
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		crc ^= crc32_le(test[i].crc, test_buf +
		    test[i].start, test[i].length);

		crc ^= crc32_be(test[i].crc, test_buf +
		    test[i].start, test[i].length);
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	}

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	/* reduce OS noise */
	local_irq_save(flags);
	local_irq_disable();

	getnstimeofday(&start);
	for (i = 0; i < 100; i++) {
		if (test[i].crc_le != crc32_le(test[i].crc, test_buf +
		    test[i].start, test[i].length))
			errors++;

		if (test[i].crc_be != crc32_be(test[i].crc, test_buf +
		    test[i].start, test[i].length))
			errors++;
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	}
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	getnstimeofday(&stop);
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	local_irq_restore(flags);
	local_irq_enable();
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	nsec = stop.tv_nsec - start.tv_nsec +
		1000000000 * (stop.tv_sec - start.tv_sec);
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	pr_info("crc32: CRC_LE_BITS = %d, CRC_BE BITS = %d\n",
		 CRC_LE_BITS, CRC_BE_BITS);

	if (errors)
		pr_warn("crc32: %d self tests failed\n", errors);
	else {
		pr_info("crc32: self tests passed, processed %d bytes in %lld nsec\n",
			bytes, nsec);
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	}
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	return 0;
}

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static int __init crc32_combine_test(void)
{
	int i, j;
	int errors = 0, runs = 0;

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	for (i = 0; i < 10; i++) {
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		u32 crc_full;

		crc_full = crc32_le(test[i].crc, test_buf + test[i].start,
				    test[i].length);
		for (j = 0; j <= test[i].length; ++j) {
			u32 crc1, crc2;
			u32 len1 = j, len2 = test[i].length - j;

			crc1 = crc32_le(test[i].crc, test_buf +
					test[i].start, len1);
			crc2 = crc32_le(0, test_buf + test[i].start +
					len1, len2);

			if (!(crc_full == crc32_le_combine(crc1, crc2, len2) &&
			      crc_full == test[i].crc_le))
				errors++;
			runs++;
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			cond_resched();
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		}
	}

	if (errors)
		pr_warn("crc32_combine: %d/%d self tests failed\n", errors, runs);
	else
		pr_info("crc32_combine: %d self tests passed\n", runs);

	return 0;
}

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static int __init crc32test_init(void)
{
	crc32_test();
	crc32c_test();
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	crc32_combine_test();
	crc32c_combine_test();

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	return 0;
}

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static void __exit crc32_exit(void)
{
}

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module_init(crc32test_init);
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module_exit(crc32_exit);
#endif /* CONFIG_CRC32_SELFTEST */