1// SPDX-License-Identifier: GPL-2.0 2/* 3 * crc32.c - CRC32 and CRC32C using LoongArch crc* instructions 4 * 5 * Module based on mips/crypto/crc32-mips.c 6 * 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 10 */ 11 12#include <linux/module.h> 13#include <crypto/internal/hash.h> 14 15#include <asm/cpu-features.h> 16#include <asm/unaligned.h> 17 18#define _CRC32(crc, value, size, type) \ 19do { \ 20 __asm__ __volatile__( \ 21 #type ".w." #size ".w" " %0, %1, %0\n\t"\ 22 : "+r" (crc) \ 23 : "r" (value) \ 24 : "memory"); \ 25} while (0) 26 27#define CRC32(crc, value, size) _CRC32(crc, value, size, crc) 28#define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc) 29 30static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len) 31{ 32 u32 crc = crc_; 33 34 while (len >= sizeof(u64)) { 35 u64 value = get_unaligned_le64(p); 36 37 CRC32(crc, value, d); 38 p += sizeof(u64); 39 len -= sizeof(u64); 40 } 41 42 if (len & sizeof(u32)) { 43 u32 value = get_unaligned_le32(p); 44 45 CRC32(crc, value, w); 46 p += sizeof(u32); 47 } 48 49 if (len & sizeof(u16)) { 50 u16 value = get_unaligned_le16(p); 51 52 CRC32(crc, value, h); 53 p += sizeof(u16); 54 } 55 56 if (len & sizeof(u8)) { 57 u8 value = *p++; 58 59 CRC32(crc, value, b); 60 } 61 62 return crc; 63} 64 65static u32 crc32c_loongarch_hw(u32 crc_, const u8 *p, unsigned int len) 66{ 67 u32 crc = crc_; 68 69 while (len >= sizeof(u64)) { 70 u64 value = get_unaligned_le64(p); 71 72 CRC32C(crc, value, d); 73 p += sizeof(u64); 74 len -= sizeof(u64); 75 } 76 77 if (len & sizeof(u32)) { 78 u32 value = get_unaligned_le32(p); 79 80 CRC32C(crc, value, w); 81 p += sizeof(u32); 82 } 83 84 if (len & sizeof(u16)) { 85 u16 value = get_unaligned_le16(p); 86 87 CRC32C(crc, value, h); 88 p += sizeof(u16); 89 } 90 91 if (len & sizeof(u8)) { 92 u8 value = *p++; 93 94 CRC32C(crc, value, b); 95 } 96 97 return crc; 98} 99 100#define CHKSUM_BLOCK_SIZE 1 101#define CHKSUM_DIGEST_SIZE 4 102 103struct chksum_ctx { 104 u32 key; 105}; 106 107struct chksum_desc_ctx { 108 u32 crc; 109}; 110 111static int chksum_init(struct shash_desc *desc) 112{ 113 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); 114 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 115 116 ctx->crc = mctx->key; 117 118 return 0; 119} 120 121/* 122 * Setting the seed allows arbitrary accumulators and flexible XOR policy 123 * If your algorithm starts with ~0, then XOR with ~0 before you set the seed. 124 */ 125static int chksum_setkey(struct crypto_shash *tfm, const u8 *key, unsigned int keylen) 126{ 127 struct chksum_ctx *mctx = crypto_shash_ctx(tfm); 128 129 if (keylen != sizeof(mctx->key)) 130 return -EINVAL; 131 132 mctx->key = get_unaligned_le32(key); 133 134 return 0; 135} 136 137static int chksum_update(struct shash_desc *desc, const u8 *data, unsigned int length) 138{ 139 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 140 141 ctx->crc = crc32_loongarch_hw(ctx->crc, data, length); 142 return 0; 143} 144 145static int chksumc_update(struct shash_desc *desc, const u8 *data, unsigned int length) 146{ 147 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 148 149 ctx->crc = crc32c_loongarch_hw(ctx->crc, data, length); 150 return 0; 151} 152 153static int chksum_final(struct shash_desc *desc, u8 *out) 154{ 155 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 156 157 put_unaligned_le32(ctx->crc, out); 158 return 0; 159} 160 161static int chksumc_final(struct shash_desc *desc, u8 *out) 162{ 163 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 164 165 put_unaligned_le32(~ctx->crc, out); 166 return 0; 167} 168 169static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) 170{ 171 put_unaligned_le32(crc32_loongarch_hw(crc, data, len), out); 172 return 0; 173} 174 175static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out) 176{ 177 put_unaligned_le32(~crc32c_loongarch_hw(crc, data, len), out); 178 return 0; 179} 180 181static int chksum_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) 182{ 183 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 184 185 return __chksum_finup(ctx->crc, data, len, out); 186} 187 188static int chksumc_finup(struct shash_desc *desc, const u8 *data, unsigned int len, u8 *out) 189{ 190 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc); 191 192 return __chksumc_finup(ctx->crc, data, len, out); 193} 194 195static int chksum_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out) 196{ 197 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); 198 199 return __chksum_finup(mctx->key, data, length, out); 200} 201 202static int chksumc_digest(struct shash_desc *desc, const u8 *data, unsigned int length, u8 *out) 203{ 204 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm); 205 206 return __chksumc_finup(mctx->key, data, length, out); 207} 208 209static int chksum_cra_init(struct crypto_tfm *tfm) 210{ 211 struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); 212 213 mctx->key = 0; 214 return 0; 215} 216 217static int chksumc_cra_init(struct crypto_tfm *tfm) 218{ 219 struct chksum_ctx *mctx = crypto_tfm_ctx(tfm); 220 221 mctx->key = ~0; 222 return 0; 223} 224 225static struct shash_alg crc32_alg = { 226 .digestsize = CHKSUM_DIGEST_SIZE, 227 .setkey = chksum_setkey, 228 .init = chksum_init, 229 .update = chksum_update, 230 .final = chksum_final, 231 .finup = chksum_finup, 232 .digest = chksum_digest, 233 .descsize = sizeof(struct chksum_desc_ctx), 234 .base = { 235 .cra_name = "crc32", 236 .cra_driver_name = "crc32-loongarch", 237 .cra_priority = 300, 238 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, 239 .cra_blocksize = CHKSUM_BLOCK_SIZE, 240 .cra_ctxsize = sizeof(struct chksum_ctx), 241 .cra_module = THIS_MODULE, 242 .cra_init = chksum_cra_init, 243 } 244}; 245 246static struct shash_alg crc32c_alg = { 247 .digestsize = CHKSUM_DIGEST_SIZE, 248 .setkey = chksum_setkey, 249 .init = chksum_init, 250 .update = chksumc_update, 251 .final = chksumc_final, 252 .finup = chksumc_finup, 253 .digest = chksumc_digest, 254 .descsize = sizeof(struct chksum_desc_ctx), 255 .base = { 256 .cra_name = "crc32c", 257 .cra_driver_name = "crc32c-loongarch", 258 .cra_priority = 300, 259 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY, 260 .cra_blocksize = CHKSUM_BLOCK_SIZE, 261 .cra_ctxsize = sizeof(struct chksum_ctx), 262 .cra_module = THIS_MODULE, 263 .cra_init = chksumc_cra_init, 264 } 265}; 266 267static int __init crc32_mod_init(void) 268{ 269 int err; 270 271 if (!cpu_has(CPU_FEATURE_CRC32)) 272 return 0; 273 274 err = crypto_register_shash(&crc32_alg); 275 if (err) 276 return err; 277 278 err = crypto_register_shash(&crc32c_alg); 279 if (err) 280 return err; 281 282 return 0; 283} 284 285static void __exit crc32_mod_exit(void) 286{ 287 if (!cpu_has(CPU_FEATURE_CRC32)) 288 return; 289 290 crypto_unregister_shash(&crc32_alg); 291 crypto_unregister_shash(&crc32c_alg); 292} 293 294module_init(crc32_mod_init); 295module_exit(crc32_mod_exit); 296 297MODULE_AUTHOR("Min Zhou <zhoumin@loongson.cn>"); 298MODULE_AUTHOR("Huacai Chen <chenhuacai@loongson.cn>"); 299MODULE_DESCRIPTION("CRC32 and CRC32C using LoongArch crc* instructions"); 300MODULE_LICENSE("GPL v2"); 301