arch/mips/crypto/crc32-mips.c - linux - Git at Google

 // 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/cpufeature.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/string.h>
 #include <asm/mipsregs.h>
 #include <linux/unaligned.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_SET_CRC(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)))
 #define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t"
 #else /* !TOOLCHAIN_SUPPORTS_CRC */
 #define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t"
 #define _ASM_UNSET_CRC(op, SZ, TYPE)
 #endif

 #define __CRC32(crc, value, op, SZ, TYPE)		\
 do {							\
 	__asm__ __volatile__(				\
 		".set	push\n\t"			\
 		_ASM_SET_CRC(op, SZ, TYPE)		\
 		#op "	%0, %1, %0\n\t"			\
 		_ASM_UNSET_CRC(op, SZ, TYPE)		\
 		".set	pop"				\
 		: "+r" (crc)				\
 		: "r" (value));				\
 } while (0)

 #define _CRC32_crc32b(crc, value)	__CRC32(crc, value, crc32b, 0, 0)
 #define _CRC32_crc32h(crc, value)	__CRC32(crc, value, crc32h, 1, 0)
 #define _CRC32_crc32w(crc, value)	__CRC32(crc, value, crc32w, 2, 0)
 #define _CRC32_crc32d(crc, value)	__CRC32(crc, value, crc32d, 3, 0)
 #define _CRC32_crc32cb(crc, value)	__CRC32(crc, value, crc32cb, 0, 1)
 #define _CRC32_crc32ch(crc, value)	__CRC32(crc, value, crc32ch, 1, 1)
 #define _CRC32_crc32cw(crc, value)	__CRC32(crc, value, crc32cw, 2, 1)
 #define _CRC32_crc32cd(crc, value)	__CRC32(crc, value, crc32cd, 3, 1)

 #define _CRC32(crc, value, size, op) \
 	_CRC32_##op##size(crc, value)

 #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_;

 	if (IS_ENABLED(CONFIG_64BIT)) {
 		for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
 			u64 value = get_unaligned_le64(p);

 			CRC32(crc, value, d);
 		}

 		if (len & sizeof(u32)) {
 			u32 value = get_unaligned_le32(p);

 			CRC32(crc, value, w);
 			p += sizeof(u32);
 		}
 	} else {
 		for (; len >= sizeof(u32); len -= sizeof(u32)) {
 			u32 value = get_unaligned_le32(p);

 			CRC32(crc, value, w);
 			p += 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_;

 	if (IS_ENABLED(CONFIG_64BIT)) {
 		for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
 			u64 value = get_unaligned_le64(p);

 			CRC32(crc, value, d);
 		}

 		if (len & sizeof(u32)) {
 			u32 value = get_unaligned_le32(p);

 			CRC32(crc, value, w);
 			p += sizeof(u32);
 		}
 	} else {
 		for (; len >= sizeof(u32); len -= sizeof(u32)) {
 			u32 value = get_unaligned_le32(p);

 			CRC32(crc, value, w);
 			p += 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))
 		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_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_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);
	// 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/cpufeature.h>
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/string.h>
	#include <asm/mipsregs.h>
	#include <linux/unaligned.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_SET_CRC(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)))
	#define _ASM_UNSET_CRC(op, SZ, TYPE) ".purgem " #op "\n\t"
	#else /* !TOOLCHAIN_SUPPORTS_CRC */
	#define _ASM_SET_CRC(op, SZ, TYPE) ".set\tcrc\n\t"
	#define _ASM_UNSET_CRC(op, SZ, TYPE)
	#endif

	#define __CRC32(crc, value, op, SZ, TYPE) \
	do { \
	__asm__ __volatile__( \
	".set push\n\t" \
	_ASM_SET_CRC(op, SZ, TYPE) \
	#op " %0, %1, %0\n\t" \
	_ASM_UNSET_CRC(op, SZ, TYPE) \
	".set pop" \
	: "+r" (crc) \
	: "r" (value)); \
	} while (0)

	#define _CRC32_crc32b(crc, value) __CRC32(crc, value, crc32b, 0, 0)
	#define _CRC32_crc32h(crc, value) __CRC32(crc, value, crc32h, 1, 0)
	#define _CRC32_crc32w(crc, value) __CRC32(crc, value, crc32w, 2, 0)
	#define _CRC32_crc32d(crc, value) __CRC32(crc, value, crc32d, 3, 0)
	#define _CRC32_crc32cb(crc, value) __CRC32(crc, value, crc32cb, 0, 1)
	#define _CRC32_crc32ch(crc, value) __CRC32(crc, value, crc32ch, 1, 1)
	#define _CRC32_crc32cw(crc, value) __CRC32(crc, value, crc32cw, 2, 1)
	#define _CRC32_crc32cd(crc, value) __CRC32(crc, value, crc32cd, 3, 1)

	#define _CRC32(crc, value, size, op) \
	_CRC32_##op##size(crc, value)

	#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_;

	if (IS_ENABLED(CONFIG_64BIT)) {
	for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
	u64 value = get_unaligned_le64(p);

	CRC32(crc, value, d);
	}

	if (len & sizeof(u32)) {
	u32 value = get_unaligned_le32(p);

	CRC32(crc, value, w);
	p += sizeof(u32);
	}
	} else {
	for (; len >= sizeof(u32); len -= sizeof(u32)) {
	u32 value = get_unaligned_le32(p);

	CRC32(crc, value, w);
	p += 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_;

	if (IS_ENABLED(CONFIG_64BIT)) {
	for (; len >= sizeof(u64); p += sizeof(u64), len -= sizeof(u64)) {
	u64 value = get_unaligned_le64(p);

	CRC32(crc, value, d);
	}

	if (len & sizeof(u32)) {
	u32 value = get_unaligned_le32(p);

	CRC32(crc, value, w);
	p += sizeof(u32);
	}
	} else {
	for (; len >= sizeof(u32); len -= sizeof(u32)) {
	u32 value = get_unaligned_le32(p);

	CRC32(crc, value, w);
	p += 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))
	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_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_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);