1 // SPDX-License-Identifier: GPL-2.0
3 * crc32.c - CRC32 and CRC32C using LoongArch crc* instructions
5 * Module based on mips/crypto/crc32-mips.c
7 * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
8 * Copyright (C) 2018 MIPS Tech, LLC
9 * Copyright (C) 2020-2023 Loongson Technology Corporation Limited
12 #include <linux/module.h>
13 #include <crypto/internal/hash.h>
15 #include <asm/cpu-features.h>
16 #include <asm/unaligned.h>
18 #define _CRC32(crc, value, size, type) \
20 __asm__ __volatile__( \
21 #type ".w." #size ".w" " %0, %1, %0\n\t"\
27 #define CRC32(crc, value, size) _CRC32(crc, value, size, crc)
28 #define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc)
30 static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
34 while (len >= sizeof(u64)) {
35 u64 value = get_unaligned_le64(p);
42 if (len & sizeof(u32)) {
43 u32 value = get_unaligned_le32(p);
50 if (len & sizeof(u16)) {
51 u16 value = get_unaligned_le16(p);
57 if (len & sizeof(u8)) {
66 static u32 crc32c_loongarch_hw(u32 crc_, const u8 *p, unsigned int len)
70 while (len >= sizeof(u64)) {
71 u64 value = get_unaligned_le64(p);
73 CRC32C(crc, value, d);
78 if (len & sizeof(u32)) {
79 u32 value = get_unaligned_le32(p);
81 CRC32C(crc, value, w);
86 if (len & sizeof(u16)) {
87 u16 value = get_unaligned_le16(p);
89 CRC32C(crc, value, h);
93 if (len & sizeof(u8)) {
96 CRC32C(crc, value, b);
102 #define CHKSUM_BLOCK_SIZE 1
103 #define CHKSUM_DIGEST_SIZE 4
109 struct chksum_desc_ctx {
113 static int chksum_init(struct shash_desc *desc)
115 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
116 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
118 ctx->crc = mctx->key;
124 * Setting the seed allows arbitrary accumulators and flexible XOR policy
125 * If your algorithm starts with ~0, then XOR with ~0 before you set the seed.
127 static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen)
129 struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
131 if (keylen != sizeof(mctx->key))
134 mctx->key = get_unaligned_le32(key);
139 static int chksum_update(struct shash_desc *desc, const u8 *data, unsigned int length)
141 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
143 ctx->crc = crc32_loongarch_hw(ctx->crc, data, length);
147 static int chksumc_update(struct shash_desc *desc, const u8 *data, unsigned int length)
149 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
151 ctx->crc = crc32c_loongarch_hw(ctx->crc, data, length);
155 static int chksum_final(struct shash_desc *desc, u8 *out)
157 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
159 put_unaligned_le32(ctx->crc, out);
163 static int chksumc_final(struct shash_desc *desc, u8 *out)
165 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
167 put_unaligned_le32(~ctx->crc, out);
171 static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
173 put_unaligned_le32(crc32_loongarch_hw(crc, data, len), out);
177 static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
179 put_unaligned_le32(~crc32c_loongarch_hw(crc, data, len), out);
183 static int chksum_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
185 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
187 return __chksum_finup(ctx->crc, data, len, out);
190 static int chksumc_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out)
192 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
194 return __chksumc_finup(ctx->crc, data, len, out);
197 static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
199 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
201 return __chksum_finup(mctx->key, data, length, out);
204 static int chksumc_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out)
206 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
208 return __chksumc_finup(mctx->key, data, length, out);
211 static int chksum_cra_init(struct crypto_tfm *tfm)
213 struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
219 static int chksumc_cra_init(struct crypto_tfm *tfm)
221 struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
227 static struct shash_alg crc32_alg = {
228 .digestsize = CHKSUM_DIGEST_SIZE,
229 .setkey = chksum_setkey,
231 .update = chksum_update,
232 .final = chksum_final,
233 .finup = chksum_finup,
234 .digest = chksum_digest,
235 .descsize = sizeof(struct chksum_desc_ctx),
238 .cra_driver_name = "crc32-loongarch",
240 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
241 .cra_blocksize = CHKSUM_BLOCK_SIZE,
242 .cra_ctxsize = sizeof(struct chksum_ctx),
243 .cra_module = THIS_MODULE,
244 .cra_init = chksum_cra_init,
248 static struct shash_alg crc32c_alg = {
249 .digestsize = CHKSUM_DIGEST_SIZE,
250 .setkey = chksum_setkey,
252 .update = chksumc_update,
253 .final = chksumc_final,
254 .finup = chksumc_finup,
255 .digest = chksumc_digest,
256 .descsize = sizeof(struct chksum_desc_ctx),
258 .cra_name = "crc32c",
259 .cra_driver_name = "crc32c-loongarch",
261 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
262 .cra_blocksize = CHKSUM_BLOCK_SIZE,
263 .cra_ctxsize = sizeof(struct chksum_ctx),
264 .cra_module = THIS_MODULE,
265 .cra_init = chksumc_cra_init,
269 static int __init crc32_mod_init(void)
273 if (!cpu_has(CPU_FEATURE_CRC32))
276 err = crypto_register_shash(&crc32_alg);
280 err = crypto_register_shash(&crc32c_alg);
287 static void __exit crc32_mod_exit(void)
289 if (!cpu_has(CPU_FEATURE_CRC32))
292 crypto_unregister_shash(&crc32_alg);
293 crypto_unregister_shash(&crc32c_alg);
296 module_init(crc32_mod_init);
297 module_exit(crc32_mod_exit);
299 MODULE_AUTHOR("Min Zhou <zhoumin@loongson.cn>");
300 MODULE_AUTHOR("Huacai Chen <chenhuacai@loongson.cn>");
301 MODULE_DESCRIPTION("CRC32 and CRC32C using LoongArch crc* instructions");
302 MODULE_LICENSE("GPL v2");