cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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crct10dif-ce-glue.c (2000B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Accelerated CRC-T10DIF using ARM NEON and Crypto Extensions instructions
      4 *
      5 * Copyright (C) 2016 Linaro Ltd <ard.biesheuvel@linaro.org>
      6 */
      7
      8#include <linux/crc-t10dif.h>
      9#include <linux/init.h>
     10#include <linux/kernel.h>
     11#include <linux/module.h>
     12#include <linux/string.h>
     13
     14#include <crypto/internal/hash.h>
     15#include <crypto/internal/simd.h>
     16
     17#include <asm/neon.h>
     18#include <asm/simd.h>
     19
     20#define CRC_T10DIF_PMULL_CHUNK_SIZE	16U
     21
     22asmlinkage u16 crc_t10dif_pmull(u16 init_crc, const u8 *buf, size_t len);
     23
     24static int crct10dif_init(struct shash_desc *desc)
     25{
     26	u16 *crc = shash_desc_ctx(desc);
     27
     28	*crc = 0;
     29	return 0;
     30}
     31
     32static int crct10dif_update(struct shash_desc *desc, const u8 *data,
     33			    unsigned int length)
     34{
     35	u16 *crc = shash_desc_ctx(desc);
     36
     37	if (length >= CRC_T10DIF_PMULL_CHUNK_SIZE && crypto_simd_usable()) {
     38		kernel_neon_begin();
     39		*crc = crc_t10dif_pmull(*crc, data, length);
     40		kernel_neon_end();
     41	} else {
     42		*crc = crc_t10dif_generic(*crc, data, length);
     43	}
     44
     45	return 0;
     46}
     47
     48static int crct10dif_final(struct shash_desc *desc, u8 *out)
     49{
     50	u16 *crc = shash_desc_ctx(desc);
     51
     52	*(u16 *)out = *crc;
     53	return 0;
     54}
     55
     56static struct shash_alg crc_t10dif_alg = {
     57	.digestsize		= CRC_T10DIF_DIGEST_SIZE,
     58	.init			= crct10dif_init,
     59	.update			= crct10dif_update,
     60	.final			= crct10dif_final,
     61	.descsize		= CRC_T10DIF_DIGEST_SIZE,
     62
     63	.base.cra_name		= "crct10dif",
     64	.base.cra_driver_name	= "crct10dif-arm-ce",
     65	.base.cra_priority	= 200,
     66	.base.cra_blocksize	= CRC_T10DIF_BLOCK_SIZE,
     67	.base.cra_module	= THIS_MODULE,
     68};
     69
     70static int __init crc_t10dif_mod_init(void)
     71{
     72	if (!(elf_hwcap2 & HWCAP2_PMULL))
     73		return -ENODEV;
     74
     75	return crypto_register_shash(&crc_t10dif_alg);
     76}
     77
     78static void __exit crc_t10dif_mod_exit(void)
     79{
     80	crypto_unregister_shash(&crc_t10dif_alg);
     81}
     82
     83module_init(crc_t10dif_mod_init);
     84module_exit(crc_t10dif_mod_exit);
     85
     86MODULE_AUTHOR("Ard Biesheuvel <ard.biesheuvel@linaro.org>");
     87MODULE_LICENSE("GPL v2");
     88MODULE_ALIAS_CRYPTO("crct10dif");