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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crc32c_glue.c (4145B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
      3 *
      4 * This is based largely upon arch/x86/crypto/crc32c-intel.c
      5 *
      6 * Copyright (C) 2008 Intel Corporation
      7 * Authors: Austin Zhang <austin_zhang@linux.intel.com>
      8 *          Kent Liu <kent.liu@intel.com>
      9 */
     10
     11#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
     12
     13#include <linux/init.h>
     14#include <linux/module.h>
     15#include <linux/string.h>
     16#include <linux/kernel.h>
     17#include <linux/crc32.h>
     18
     19#include <crypto/internal/hash.h>
     20
     21#include <asm/pstate.h>
     22#include <asm/elf.h>
     23
     24#include "opcodes.h"
     25
     26/*
     27 * Setting the seed allows arbitrary accumulators and flexible XOR policy
     28 * If your algorithm starts with ~0, then XOR with ~0 before you set
     29 * the seed.
     30 */
     31static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
     32				 unsigned int keylen)
     33{
     34	u32 *mctx = crypto_shash_ctx(hash);
     35
     36	if (keylen != sizeof(u32))
     37		return -EINVAL;
     38	*mctx = le32_to_cpup((__le32 *)key);
     39	return 0;
     40}
     41
     42static int crc32c_sparc64_init(struct shash_desc *desc)
     43{
     44	u32 *mctx = crypto_shash_ctx(desc->tfm);
     45	u32 *crcp = shash_desc_ctx(desc);
     46
     47	*crcp = *mctx;
     48
     49	return 0;
     50}
     51
     52extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
     53
     54static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
     55{
     56	unsigned int asm_len;
     57
     58	asm_len = len & ~7U;
     59	if (asm_len) {
     60		crc32c_sparc64(crcp, data, asm_len);
     61		data += asm_len / 8;
     62		len -= asm_len;
     63	}
     64	if (len)
     65		*crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
     66}
     67
     68static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
     69				 unsigned int len)
     70{
     71	u32 *crcp = shash_desc_ctx(desc);
     72
     73	crc32c_compute(crcp, (const u64 *) data, len);
     74
     75	return 0;
     76}
     77
     78static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
     79				  u8 *out)
     80{
     81	u32 tmp = *crcp;
     82
     83	crc32c_compute(&tmp, (const u64 *) data, len);
     84
     85	*(__le32 *) out = ~cpu_to_le32(tmp);
     86	return 0;
     87}
     88
     89static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
     90				unsigned int len, u8 *out)
     91{
     92	return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
     93}
     94
     95static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
     96{
     97	u32 *crcp = shash_desc_ctx(desc);
     98
     99	*(__le32 *) out = ~cpu_to_le32p(crcp);
    100	return 0;
    101}
    102
    103static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
    104				 unsigned int len, u8 *out)
    105{
    106	return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
    107				      out);
    108}
    109
    110static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
    111{
    112	u32 *key = crypto_tfm_ctx(tfm);
    113
    114	*key = ~0;
    115
    116	return 0;
    117}
    118
    119#define CHKSUM_BLOCK_SIZE	1
    120#define CHKSUM_DIGEST_SIZE	4
    121
    122static struct shash_alg alg = {
    123	.setkey			=	crc32c_sparc64_setkey,
    124	.init			=	crc32c_sparc64_init,
    125	.update			=	crc32c_sparc64_update,
    126	.final			=	crc32c_sparc64_final,
    127	.finup			=	crc32c_sparc64_finup,
    128	.digest			=	crc32c_sparc64_digest,
    129	.descsize		=	sizeof(u32),
    130	.digestsize		=	CHKSUM_DIGEST_SIZE,
    131	.base			=	{
    132		.cra_name		=	"crc32c",
    133		.cra_driver_name	=	"crc32c-sparc64",
    134		.cra_priority		=	SPARC_CR_OPCODE_PRIORITY,
    135		.cra_flags		=	CRYPTO_ALG_OPTIONAL_KEY,
    136		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
    137		.cra_ctxsize		=	sizeof(u32),
    138		.cra_alignmask		=	7,
    139		.cra_module		=	THIS_MODULE,
    140		.cra_init		=	crc32c_sparc64_cra_init,
    141	}
    142};
    143
    144static bool __init sparc64_has_crc32c_opcode(void)
    145{
    146	unsigned long cfr;
    147
    148	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
    149		return false;
    150
    151	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
    152	if (!(cfr & CFR_CRC32C))
    153		return false;
    154
    155	return true;
    156}
    157
    158static int __init crc32c_sparc64_mod_init(void)
    159{
    160	if (sparc64_has_crc32c_opcode()) {
    161		pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
    162		return crypto_register_shash(&alg);
    163	}
    164	pr_info("sparc64 crc32c opcode not available.\n");
    165	return -ENODEV;
    166}
    167
    168static void __exit crc32c_sparc64_mod_fini(void)
    169{
    170	crypto_unregister_shash(&alg);
    171}
    172
    173module_init(crc32c_sparc64_mod_init);
    174module_exit(crc32c_sparc64_mod_fini);
    175
    176MODULE_LICENSE("GPL");
    177MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
    178
    179MODULE_ALIAS_CRYPTO("crc32c");
    180
    181#include "crop_devid.c"