// SPDX-License-Identifier: GPL-2.0 /* * crc32.c - CRC32 and CRC32C using LoongArch crc* instructions * * Module based on mips/crypto/crc32-mips.c * * Copyright (C) 2014 Linaro Ltd * Copyright (C) 2018 MIPS Tech, LLC * Copyright (C) 2020-2023 Loongson Technology Corporation Limited */ #include #include #include #include #define _CRC32(crc, value, size, type) \ do { \ __asm__ __volatile__( \ #type ".w." #size ".w" " %0, %1, %0\n\t"\ : "+r" (crc) \ : "r" (value) \ : "memory"); \ } while (0) #define CRC32(crc, value, size) _CRC32(crc, value, size, crc) #define CRC32C(crc, value, size) _CRC32(crc, value, size, crcc) static u32 crc32_loongarch_hw(u32 crc_, const u8 *p, unsigned int len) { u32 crc = crc_; while (len >= sizeof(u64)) { u64 value = get_unaligned_le64(p); CRC32(crc, value, d); p += sizeof(u64); len -= sizeof(u64); } if (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_loongarch_hw(u32 crc_, const u8 *p, unsigned int len) { u32 crc = crc_; while (len >= sizeof(u64)) { u64 value = get_unaligned_le64(p); CRC32C(crc, value, d); p += sizeof(u64); len -= sizeof(u64); } if (len & sizeof(u32)) { u32 value = get_unaligned_le32(p); CRC32C(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_loongarch_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_loongarch_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_loongarch_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_loongarch_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 int chksumc_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-loongarch", .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-loongarch", .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 = chksumc_cra_init, } }; static int __init crc32_mod_init(void) { int err; if (!cpu_has(CPU_FEATURE_CRC32)) return 0; err = crypto_register_shash(&crc32_alg); if (err) return err; err = crypto_register_shash(&crc32c_alg); if (err) return err; return 0; } static void __exit crc32_mod_exit(void) { if (!cpu_has(CPU_FEATURE_CRC32)) return; crypto_unregister_shash(&crc32_alg); crypto_unregister_shash(&crc32c_alg); } module_init(crc32_mod_init); module_exit(crc32_mod_exit); MODULE_AUTHOR("Min Zhou "); MODULE_AUTHOR("Huacai Chen "); MODULE_DESCRIPTION("CRC32 and CRC32C using LoongArch crc* instructions"); MODULE_LICENSE("GPL v2");