aboutsummaryrefslogtreecommitdiff
path: root/arch/sparc/crypto/crc32c_glue.c
blob: 5162fad912ce09faf6fcf5979e2ef60cadc03ba4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
/* Glue code for CRC32C optimized for sparc64 crypto opcodes.
 *
 * This is based largely upon arch/x86/crypto/crc32c-intel.c
 *
 * Copyright (C) 2008 Intel Corporation
 * Authors: Austin Zhang <austin_zhang@linux.intel.com>
 *          Kent Liu <kent.liu@intel.com>
 */

#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt

#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/crc32.h>

#include <crypto/internal/hash.h>

#include <asm/pstate.h>
#include <asm/elf.h>

#include "opcodes.h"

/*
 * Setting the seed allows arbitrary accumulators and flexible XOR policy
 * If your algorithm starts with ~0, then XOR with ~0 before you set
 * the seed.
 */
static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
				 unsigned int keylen)
{
	u32 *mctx = crypto_shash_ctx(hash);

	if (keylen != sizeof(u32)) {
		crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	*(__le32 *)mctx = le32_to_cpup((__le32 *)key);
	return 0;
}

static int crc32c_sparc64_init(struct shash_desc *desc)
{
	u32 *mctx = crypto_shash_ctx(desc->tfm);
	u32 *crcp = shash_desc_ctx(desc);

	*crcp = *mctx;

	return 0;
}

extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);

static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
{
	unsigned int asm_len;

	asm_len = len & ~7U;
	if (asm_len) {
		crc32c_sparc64(crcp, data, asm_len);
		data += asm_len / 8;
		len -= asm_len;
	}
	if (len)
		*crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
}

static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
				 unsigned int len)
{
	u32 *crcp = shash_desc_ctx(desc);

	crc32c_compute(crcp, (const u64 *) data, len);

	return 0;
}

static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
				  u8 *out)
{
	u32 tmp = *crcp;

	crc32c_compute(&tmp, (const u64 *) data, len);

	*(__le32 *) out = ~cpu_to_le32(tmp);
	return 0;
}

static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
				unsigned int len, u8 *out)
{
	return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
}

static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
{
	u32 *crcp = shash_desc_ctx(desc);

	*(__le32 *) out = ~cpu_to_le32p(crcp);
	return 0;
}

static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
				 unsigned int len, u8 *out)
{
	return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
				      out);
}

static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
{
	u32 *key = crypto_tfm_ctx(tfm);

	*key = ~0;

	return 0;
}

#define CHKSUM_BLOCK_SIZE	1
#define CHKSUM_DIGEST_SIZE	4

static struct shash_alg alg = {
	.setkey			=	crc32c_sparc64_setkey,
	.init			=	crc32c_sparc64_init,
	.update			=	crc32c_sparc64_update,
	.final			=	crc32c_sparc64_final,
	.finup			=	crc32c_sparc64_finup,
	.digest			=	crc32c_sparc64_digest,
	.descsize		=	sizeof(u32),
	.digestsize		=	CHKSUM_DIGEST_SIZE,
	.base			=	{
		.cra_name		=	"crc32c",
		.cra_driver_name	=	"crc32c-sparc64",
		.cra_priority		=	SPARC_CR_OPCODE_PRIORITY,
		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
		.cra_ctxsize		=	sizeof(u32),
		.cra_alignmask		=	7,
		.cra_module		=	THIS_MODULE,
		.cra_init		=	crc32c_sparc64_cra_init,
	}
};

static bool __init sparc64_has_crc32c_opcode(void)
{
	unsigned long cfr;

	if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
		return false;

	__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
	if (!(cfr & CFR_CRC32C))
		return false;

	return true;
}

static int __init crc32c_sparc64_mod_init(void)
{
	if (sparc64_has_crc32c_opcode()) {
		pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
		return crypto_register_shash(&alg);
	}
	pr_info("sparc64 crc32c opcode not available.\n");
	return -ENODEV;
}

static void __exit crc32c_sparc64_mod_fini(void)
{
	crypto_unregister_shash(&alg);
}

module_init(crc32c_sparc64_mod_init);
module_exit(crc32c_sparc64_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");

MODULE_ALIAS("crc32c");

#include "crop_devid.c"