VisionFive2 Linux kernel

2874c5fd28426 (Thomas Gleixner        2019-05-27 08:55:01 +0200  1) // SPDX-License-Identifier: GPL-2.0-or-later
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  2) /* 
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  3)  * CRC32C
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  4)  *@Article{castagnoli-crc,
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  5)  * author =       { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  6)  * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  7)  *                 and 32 Parity Bits}},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  8)  * journal =      IEEE Transactions on Communication,
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700  9)  * year =         {1993},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 10)  * volume =       {41},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 11)  * number =       {6},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 12)  * pages =        {},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 13)  * month =        {June},
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 14)  *}
f1e594acb1bdf (Randy Dunlap           2020-10-15 20:10:48 -0700 15)  * Used by the iSCSI driver, possibly others, and derived from
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 16)  * the iscsi-crc.c module of the linux-iscsi driver at
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 17)  * http://linux-iscsi.sourceforge.net.
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 18)  *
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 19)  * Following the example of lib/crc32, this function is intended to be
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 20)  * flexible and useful for all users.  Modules that currently have their
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 21)  * own crc32c, but hopefully may be able to use this one are:
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 22)  *  net/sctp (please add all your doco to here if you change to
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 23)  *            use this one!)
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 24)  *  <endoflist>
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 25)  *
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 26)  * Copyright (c) 2004 Cisco Systems, Inc.
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 27)  */
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 28) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 29) #include <crypto/hash.h>
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 30) #include <linux/err.h>
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 31) #include <linux/init.h>
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 32) #include <linux/kernel.h>
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 33) #include <linux/module.h>
290e0e0f2b54b (Jean Delvare           2016-01-20 14:58:06 -0800 34) #include <linux/crc32c.h>
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 35) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 36) static struct crypto_shash *tfm;
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 37) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 38) u32 crc32c(u32 crc, const void *address, unsigned int length)
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 39) {
ea0e0de69fc41 (Jan-Simon Möller       2012-07-02 12:54:28 +0200 40) 	SHASH_DESC_ON_STACK(shash, tfm);
d41519a69b35b (David Miller           2017-06-02 11:28:54 -0400 41) 	u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 42) 	int err;
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 43) 
ea0e0de69fc41 (Jan-Simon Möller       2012-07-02 12:54:28 +0200 44) 	shash->tfm = tfm;
ea0e0de69fc41 (Jan-Simon Möller       2012-07-02 12:54:28 +0200 45) 	*ctx = crc;
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 46) 
ea0e0de69fc41 (Jan-Simon Möller       2012-07-02 12:54:28 +0200 47) 	err = crypto_shash_update(shash, address, length);
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 48) 	BUG_ON(err);
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 49) 
d41519a69b35b (David Miller           2017-06-02 11:28:54 -0400 50) 	ret = *ctx;
d41519a69b35b (David Miller           2017-06-02 11:28:54 -0400 51) 	barrier_data(ctx);
d41519a69b35b (David Miller           2017-06-02 11:28:54 -0400 52) 	return ret;
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 53) }
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 54) 
53b146ae59826 (Adrian-Ken Rueegsegger 2008-11-11 12:14:00 +0800 55) EXPORT_SYMBOL(crc32c);
53b146ae59826 (Adrian-Ken Rueegsegger 2008-11-11 12:14:00 +0800 56) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 57) static int __init libcrc32c_mod_init(void)
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 58) {
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 59) 	tfm = crypto_alloc_shash("crc32c", 0, 0);
f8eaf298c8dc0 (Fabian Frederick       2014-06-04 16:11:51 -0700 60) 	return PTR_ERR_OR_ZERO(tfm);
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 61) }
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 62) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 63) static void __exit libcrc32c_mod_fini(void)
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 64) {
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 65) 	crypto_free_shash(tfm);
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 66) }
^1da177e4c3f4 (Linus Torvalds         2005-04-16 15:20:36 -0700 67) 
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 68) const char *crc32c_impl(void)
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 69) {
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 70) 	return crypto_shash_driver_name(tfm);
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 71) }
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 72) EXPORT_SYMBOL(crc32c_impl);
df91f56adce1f (Nikolay Borisov        2018-01-08 11:45:04 +0200 73) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 74) module_init(libcrc32c_mod_init);
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 75) module_exit(libcrc32c_mod_fini);
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 76) 
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 77) MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 78) MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations");
69c35efcf1576 (Herbert Xu             2008-11-07 15:11:47 +0800 79) MODULE_LICENSE("GPL");
fd7f6727102a1 (Jean Delvare           2016-01-18 17:06:05 +0100 80) MODULE_SOFTDEP("pre: crc32c");