Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /* 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * CRC32C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *@Article{castagnoli-crc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * author =       { Guy Castagnoli and Stefan Braeuer and Martin Herrman},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  * title =        {{Optimization of Cyclic Redundancy-Check Codes with 24
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *                 and 32 Parity Bits}},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  * journal =      IEEE Transactions on Communication,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  * year =         {1993},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  * volume =       {41},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * number =       {6},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * pages =        {},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  * month =        {June},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  * Used by the iSCSI driver, possibly others, and derived from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  * the iscsi-crc.c module of the linux-iscsi driver at
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  * http://linux-iscsi.sourceforge.net.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  * Following the example of lib/crc32, this function is intended to be
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * flexible and useful for all users.  Modules that currently have their
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  * own crc32c, but hopefully may be able to use this one are:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  *  net/sctp (please add all your doco to here if you change to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  *            use this one!)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  *  <endoflist>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  * Copyright (c) 2004 Cisco Systems, Inc.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <crypto/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/crc32c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) static struct crypto_shash *tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u32 crc32c(u32 crc, const void *address, unsigned int length)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	SHASH_DESC_ON_STACK(shash, tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 	u32 ret, *ctx = (u32 *)shash_desc_ctx(shash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	shash->tfm = tfm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	*ctx = crc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	err = crypto_shash_update(shash, address, length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	BUG_ON(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 	ret = *ctx;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 	barrier_data(ctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) EXPORT_SYMBOL(crc32c);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) static int __init libcrc32c_mod_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	tfm = crypto_alloc_shash("crc32c", 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	return PTR_ERR_OR_ZERO(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) static void __exit libcrc32c_mod_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	crypto_free_shash(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) const char *crc32c_impl(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	return crypto_shash_driver_name(tfm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) EXPORT_SYMBOL(crc32c_impl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) module_init(libcrc32c_mod_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) module_exit(libcrc32c_mod_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) MODULE_AUTHOR("Clay Haapala <chaapala@cisco.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) MODULE_DESCRIPTION("CRC32c (Castagnoli) calculations");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) MODULE_SOFTDEP("pre: crc32c");