[linux-2.6-block.git] / arch / mips / crypto / crc32-mips.c

// SPDX-License-Identifier: GPL-2.0
/*
 * crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
 *
 * Module based on arm64/crypto/crc32-arm.c
 *
 * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
 * Copyright (C) 2018 MIPS Tech, LLC
 */

#include <linux/unaligned/access_ok.h>
#include <linux/cpufeature.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <asm/mipsregs.h>

#include <crypto/internal/hash.h>

enum crc_op_size {
	b, h, w, d,
};

enum crc_type {
	crc32,
	crc32c,
};

#ifndef TOOLCHAIN_SUPPORTS_CRC
#define _ASM_MACRO_CRC32(OP, SZ, TYPE)					  \
_ASM_MACRO_3R(OP, rt, rs, rt2,						  \
	".ifnc	\\rt, \\rt2\n\t"					  \
	".error	\"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
	".endif\n\t"							  \
	_ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) |	  \
			  ((SZ) <<  6) | ((TYPE) << 8))			  \
	_ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) |	  \
			  ((SZ) << 14) | ((TYPE) << 3)))
_ASM_MACRO_CRC32(crc32b,  0, 0);
_ASM_MACRO_CRC32(crc32h,  1, 0);
_ASM_MACRO_CRC32(crc32w,  2, 0);
_ASM_MACRO_CRC32(crc32d,  3, 0);
_ASM_MACRO_CRC32(crc32cb, 0, 1);
_ASM_MACRO_CRC32(crc32ch, 1, 1);
_ASM_MACRO_CRC32(crc32cw, 2, 1);
_ASM_MACRO_CRC32(crc32cd, 3, 1);
#define _ASM_SET_CRC ""
#else /* !TOOLCHAIN_SUPPORTS_CRC */
#define _ASM_SET_CRC ".set\tcrc\n\t"
#endif

#define _CRC32(crc, value, size, type)		\
do {						\
	__asm__ __volatile__(			\
		".set	push\n\t"		\
		_ASM_SET_CRC			\
		#type #size "	%0, %1, %0\n\t"	\
		".set	pop"			\
		: "+r" (crc)			\
		: "r" (value));			\
} while (0)

#define CRC32(crc, value, size) \
	_CRC32(crc, value, size, crc32)

#define CRC32C(crc, value, size) \
	_CRC32(crc, value, size, crc32c)

static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
{
	u32 crc = crc_;

#ifdef CONFIG_64BIT
	while (len >= sizeof(u64)) {
		u64 value = get_unaligned_le64(p);

		CRC32(crc, value, d);
		p += sizeof(u64);
		len -= sizeof(u64);
	}

	if (len & sizeof(u32)) {
#else /* !CONFIG_64BIT */
	while (len >= sizeof(u32)) {
#endif
		u32 value = get_unaligned_le32(p);

		CRC32(crc, value, w);
		p += sizeof(u32);
		len -= sizeof(u32);
	}

	if (len & sizeof(u16)) {
		u16 value = get_unaligned_le16(p);

		CRC32(crc, value, h);
		p += sizeof(u16);
	}

	if (len & sizeof(u8)) {
		u8 value = *p++;

		CRC32(crc, value, b);
	}

	return crc;
}

static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
{
	u32 crc = crc_;

#ifdef CONFIG_64BIT
	while (len >= sizeof(u64)) {
		u64 value = get_unaligned_le64(p);

		CRC32C(crc, value, d);
		p += sizeof(u64);
		len -= sizeof(u64);
	}

	if (len & sizeof(u32)) {
#else /* !CONFIG_64BIT */
	while (len >= sizeof(u32)) {
#endif
		u32 value = get_unaligned_le32(p);

		CRC32C(crc, value, w);
		p += sizeof(u32);
		len -= sizeof(u32);
	}

	if (len & sizeof(u16)) {
		u16 value = get_unaligned_le16(p);

		CRC32C(crc, value, h);
		p += sizeof(u16);
	}

	if (len & sizeof(u8)) {
		u8 value = *p++;

		CRC32C(crc, value, b);
	}
	return crc;
}

#define CHKSUM_BLOCK_SIZE	1
#define CHKSUM_DIGEST_SIZE	4

struct chksum_ctx {
	u32 key;
};

struct chksum_desc_ctx {
	u32 crc;
};

static int chksum_init(struct shash_desc *desc)
{
	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = mctx->key;

	return 0;
}

/*
 * 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 chksum_setkey(struct crypto_shash *tfm, const u8 *key,
			 unsigned int keylen)
{
	struct chksum_ctx *mctx = crypto_shash_ctx(tfm);

	if (keylen != sizeof(mctx->key)) {
		crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
		return -EINVAL;
	}
	mctx->key = get_unaligned_le32(key);
	return 0;
}

static int chksum_update(struct shash_desc *desc, const u8 *data,
			 unsigned int length)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
	return 0;
}

static int chksumc_update(struct shash_desc *desc, const u8 *data,
			 unsigned int length)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
	return 0;
}

static int chksum_final(struct shash_desc *desc, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	put_unaligned_le32(ctx->crc, out);
	return 0;
}

static int chksumc_final(struct shash_desc *desc, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	put_unaligned_le32(~ctx->crc, out);
	return 0;
}

static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
{
	put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
	return 0;
}

static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
{
	put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
	return 0;
}

static int chksum_finup(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	return __chksum_finup(ctx->crc, data, len, out);
}

static int chksumc_finup(struct shash_desc *desc, const u8 *data,
			unsigned int len, u8 *out)
{
	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);

	return __chksumc_finup(ctx->crc, data, len, out);
}

static int chksum_digest(struct shash_desc *desc, const u8 *data,
			 unsigned int length, u8 *out)
{
	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);

	return __chksum_finup(mctx->key, data, length, out);
}

static int chksumc_digest(struct shash_desc *desc, const u8 *data,
			 unsigned int length, u8 *out)
{
	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);

	return __chksumc_finup(mctx->key, data, length, out);
}

static int chksum_cra_init(struct crypto_tfm *tfm)
{
	struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);

	mctx->key = ~0;
	return 0;
}

static struct shash_alg crc32_alg = {
	.digestsize		=	CHKSUM_DIGEST_SIZE,
	.setkey			=	chksum_setkey,
	.init			=	chksum_init,
	.update			=	chksum_update,
	.final			=	chksum_final,
	.finup			=	chksum_finup,
	.digest			=	chksum_digest,
	.descsize		=	sizeof(struct chksum_desc_ctx),
	.base			=	{
		.cra_name		=	"crc32",
		.cra_driver_name	=	"crc32-mips-hw",
		.cra_priority		=	300,
		.cra_flags		=	CRYPTO_ALG_OPTIONAL_KEY,
		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
		.cra_alignmask		=	0,
		.cra_ctxsize		=	sizeof(struct chksum_ctx),
		.cra_module		=	THIS_MODULE,
		.cra_init		=	chksum_cra_init,
	}
};

static struct shash_alg crc32c_alg = {
	.digestsize		=	CHKSUM_DIGEST_SIZE,
	.setkey			=	chksum_setkey,
	.init			=	chksum_init,
	.update			=	chksumc_update,
	.final			=	chksumc_final,
	.finup			=	chksumc_finup,
	.digest			=	chksumc_digest,
	.descsize		=	sizeof(struct chksum_desc_ctx),
	.base			=	{
		.cra_name		=	"crc32c",
		.cra_driver_name	=	"crc32c-mips-hw",
		.cra_priority		=	300,
		.cra_flags		=	CRYPTO_ALG_OPTIONAL_KEY,
		.cra_blocksize		=	CHKSUM_BLOCK_SIZE,
		.cra_alignmask		=	0,
		.cra_ctxsize		=	sizeof(struct chksum_ctx),
		.cra_module		=	THIS_MODULE,
		.cra_init		=	chksum_cra_init,
	}
};

static int __init crc32_mod_init(void)
{
	int err;

	err = crypto_register_shash(&crc32_alg);

	if (err)
		return err;

	err = crypto_register_shash(&crc32c_alg);

	if (err) {
		crypto_unregister_shash(&crc32_alg);
		return err;
	}

	return 0;
}

static void __exit crc32_mod_exit(void)
{
	crypto_unregister_shash(&crc32_alg);
	crypto_unregister_shash(&crc32c_alg);
}

MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
MODULE_LICENSE("GPL v2");

module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
module_exit(crc32_mod_exit);
Commit	Line	Data
4a5dc51e MN	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
	4	*
	5	* Module based on arm64/crypto/crc32-arm.c
	6	*
	7	* Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
	8	* Copyright (C) 2018 MIPS Tech, LLC
	9	*/
	10
	11	#include <linux/unaligned/access_ok.h>
	12	#include <linux/cpufeature.h>
	13	#include <linux/init.h>
	14	#include <linux/kernel.h>
	15	#include <linux/module.h>
	16	#include <linux/string.h>
	17	#include <asm/mipsregs.h>
	18
	19	#include <crypto/internal/hash.h>
	20
	21	enum crc_op_size {
	22	b, h, w, d,
	23	};
	24
	25	enum crc_type {
	26	crc32,
	27	crc32c,
	28	};
	29
	30	#ifndef TOOLCHAIN_SUPPORTS_CRC
	31	#define _ASM_MACRO_CRC32(OP, SZ, TYPE) \
	32	_ASM_MACRO_3R(OP, rt, rs, rt2, \
	33	".ifnc \\rt, \\rt2\n\t" \
	34	".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
	35	".endif\n\t" \
	36	_ASM_INSN_IF_MIPS(0x7c00000f \| (__rt << 16) \| (__rs << 21) \| \
	37	((SZ) << 6) \| ((TYPE) << 8)) \
	38	_ASM_INSN32_IF_MM(0x00000030 \| (__rs << 16) \| (__rt << 21) \| \
	39	((SZ) << 14) \| ((TYPE) << 3)))
	40	_ASM_MACRO_CRC32(crc32b, 0, 0);
	41	_ASM_MACRO_CRC32(crc32h, 1, 0);
	42	_ASM_MACRO_CRC32(crc32w, 2, 0);
	43	_ASM_MACRO_CRC32(crc32d, 3, 0);
	44	_ASM_MACRO_CRC32(crc32cb, 0, 1);
	45	_ASM_MACRO_CRC32(crc32ch, 1, 1);
	46	_ASM_MACRO_CRC32(crc32cw, 2, 1);
	47	_ASM_MACRO_CRC32(crc32cd, 3, 1);
	48	#define _ASM_SET_CRC ""
	49	#else /* !TOOLCHAIN_SUPPORTS_CRC */
	50	#define _ASM_SET_CRC ".set\tcrc\n\t"
	51	#endif
	52
	53	#define _CRC32(crc, value, size, type) \
	54	do { \
	55	__asm__ __volatile__( \
	56	".set push\n\t" \
	57	_ASM_SET_CRC \
	58	#type #size " %0, %1, %0\n\t" \
	59	".set pop" \
	60	: "+r" (crc) \
	61	: "r" (value)); \
	62	} while (0)
	63
	64	#define CRC32(crc, value, size) \
65	_CRC32(crc, value, size, crc32)
66
67	#define CRC32C(crc, value, size) \
68	_CRC32(crc, value, size, crc32c)
69
70	static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
71	{
72	u32 crc = crc_;
73
74	#ifdef CONFIG_64BIT
75	while (len >= sizeof(u64)) {
76	u64 value = get_unaligned_le64(p);
77
78	CRC32(crc, value, d);
79	p += sizeof(u64);
80	len -= sizeof(u64);
81	}
82
83	if (len & sizeof(u32)) {
84	#else /* !CONFIG_64BIT */
85	while (len >= sizeof(u32)) {
86	#endif
87	u32 value = get_unaligned_le32(p);
88
89	CRC32(crc, value, w);
90	p += sizeof(u32);
91	len -= sizeof(u32);
92	}
93
94	if (len & sizeof(u16)) {
95	u16 value = get_unaligned_le16(p);
96
97	CRC32(crc, value, h);
98	p += sizeof(u16);
99	}
100
101	if (len & sizeof(u8)) {
102	u8 value = *p++;
103
104	CRC32(crc, value, b);
105	}
106
107	return crc;
108	}
109
110	static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
111	{
112	u32 crc = crc_;
113
114	#ifdef CONFIG_64BIT
115	while (len >= sizeof(u64)) {
116	u64 value = get_unaligned_le64(p);
117
118	CRC32C(crc, value, d);
119	p += sizeof(u64);
120	len -= sizeof(u64);
121	}
122
123	if (len & sizeof(u32)) {
124	#else /* !CONFIG_64BIT */
125	while (len >= sizeof(u32)) {
126	#endif
127	u32 value = get_unaligned_le32(p);
128
129	CRC32C(crc, value, w);
130	p += sizeof(u32);
131	len -= sizeof(u32);
132	}
133
134	if (len & sizeof(u16)) {
135	u16 value = get_unaligned_le16(p);
136
137	CRC32C(crc, value, h);
138	p += sizeof(u16);
139	}
140
141	if (len & sizeof(u8)) {
142	u8 value = *p++;
143
144	CRC32C(crc, value, b);
145	}
146	return crc;
147	}
148
149	#define CHKSUM_BLOCK_SIZE 1
150	#define CHKSUM_DIGEST_SIZE 4
151
152	struct chksum_ctx {
153	u32 key;
154	};
155
156	struct chksum_desc_ctx {
157	u32 crc;
158	};
159
160	static int chksum_init(struct shash_desc *desc)
161	{
162	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
163	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
164
165	ctx->crc = mctx->key;
166
167	return 0;
168	}
169
170	/*
171	* Setting the seed allows arbitrary accumulators and flexible XOR policy
172	* If your algorithm starts with ~0, then XOR with ~0 before you set
173	* the seed.
174	*/
175	static int chksum_setkey(struct crypto_shash tfm, const u8 key,
176	unsigned int keylen)
177	{
178	struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
179
180	if (keylen != sizeof(mctx->key)) {
181	crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
182	return -EINVAL;
183	}
184	mctx->key = get_unaligned_le32(key);
185	return 0;
186	}
187
188	static int chksum_update(struct shash_desc desc, const u8 data,
189	unsigned int length)
190	{
191	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
192
193	ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
194	return 0;
195	}
196
197	static int chksumc_update(struct shash_desc desc, const u8 data,
198	unsigned int length)
199	{
200	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
201
202	ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
203	return 0;
204	}
205
206	static int chksum_final(struct shash_desc desc, u8 out)
207	{
208	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
209
210	put_unaligned_le32(ctx->crc, out);
211	return 0;
212	}
213
214	static int chksumc_final(struct shash_desc desc, u8 out)
215	{
216	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
217
218	put_unaligned_le32(~ctx->crc, out);
219	return 0;
220	}
221
222	static int __chksum_finup(u32 crc, const u8 data, unsigned int len, u8 out)
223	{
224	put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
225	return 0;
226	}
227
228	static int __chksumc_finup(u32 crc, const u8 data, unsigned int len, u8 out)
229	{
230	put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
231	return 0;
232	}
233
234	static int chksum_finup(struct shash_desc desc, const u8 data,
235	unsigned int len, u8 *out)
236	{
237	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
238
239	return __chksum_finup(ctx->crc, data, len, out);
240	}
241
242	static int chksumc_finup(struct shash_desc desc, const u8 data,
243	unsigned int len, u8 *out)
244	{
245	struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
246
247	return __chksumc_finup(ctx->crc, data, len, out);
248	}
249
250	static int chksum_digest(struct shash_desc desc, const u8 data,
251	unsigned int length, u8 *out)
252	{
253	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
254
255	return __chksum_finup(mctx->key, data, length, out);
256	}
257
258	static int chksumc_digest(struct shash_desc desc, const u8 data,
259	unsigned int length, u8 *out)
260	{
261	struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
262
263	return __chksumc_finup(mctx->key, data, length, out);
264	}
265
266	static int chksum_cra_init(struct crypto_tfm *tfm)
267	{
268	struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
269
270	mctx->key = ~0;
271	return 0;
272	}
273
274	static struct shash_alg crc32_alg = {
275	.digestsize = CHKSUM_DIGEST_SIZE,
276	.setkey = chksum_setkey,
277	.init = chksum_init,
278	.update = chksum_update,
279	.final = chksum_final,
280	.finup = chksum_finup,
281	.digest = chksum_digest,
282	.descsize = sizeof(struct chksum_desc_ctx),
283	.base = {
284	.cra_name = "crc32",
285	.cra_driver_name = "crc32-mips-hw",
286	.cra_priority = 300,
287	.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
288	.cra_blocksize = CHKSUM_BLOCK_SIZE,
289	.cra_alignmask = 0,
290	.cra_ctxsize = sizeof(struct chksum_ctx),
291	.cra_module = THIS_MODULE,
292	.cra_init = chksum_cra_init,
293	}
294	};
295
296	static struct shash_alg crc32c_alg = {
297	.digestsize = CHKSUM_DIGEST_SIZE,
298	.setkey = chksum_setkey,
299	.init = chksum_init,
300	.update = chksumc_update,
301	.final = chksumc_final,
302	.finup = chksumc_finup,
303	.digest = chksumc_digest,
304	.descsize = sizeof(struct chksum_desc_ctx),
305	.base = {
306	.cra_name = "crc32c",
307	.cra_driver_name = "crc32c-mips-hw",
308	.cra_priority = 300,
309	.cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
310	.cra_blocksize = CHKSUM_BLOCK_SIZE,
311	.cra_alignmask = 0,
312	.cra_ctxsize = sizeof(struct chksum_ctx),
313	.cra_module = THIS_MODULE,
314	.cra_init = chksum_cra_init,
315	}
316	};
317
318	static int __init crc32_mod_init(void)
319	{
320	int err;
321
322	err = crypto_register_shash(&crc32_alg);
323
324	if (err)
325	return err;
326
327	err = crypto_register_shash(&crc32c_alg);
328
329	if (err) {
330	crypto_unregister_shash(&crc32_alg);
331	return err;
332	}
333
334	return 0;
335	}
336
337	static void __exit crc32_mod_exit(void)
338	{
339	crypto_unregister_shash(&crc32_alg);
340	crypto_unregister_shash(&crc32c_alg);
341	}
342
343	MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
344	MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
345	MODULE_LICENSE("GPL v2");
346
347	module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
348	module_exit(crc32_mod_exit);