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181 lines
4.0 KiB
181 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* Glue code for CRC32C optimized for sparc64 crypto opcodes. |
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* |
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* This is based largely upon arch/x86/crypto/crc32c-intel.c |
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* |
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* Copyright (C) 2008 Intel Corporation |
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* Authors: Austin Zhang <[email protected]> |
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* Kent Liu <[email protected]> |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/string.h> |
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#include <linux/kernel.h> |
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#include <linux/crc32.h> |
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#include <crypto/internal/hash.h> |
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#include <asm/pstate.h> |
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#include <asm/elf.h> |
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#include "opcodes.h" |
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/* |
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* Setting the seed allows arbitrary accumulators and flexible XOR policy |
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* If your algorithm starts with ~0, then XOR with ~0 before you set |
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* the seed. |
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*/ |
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static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key, |
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unsigned int keylen) |
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{ |
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u32 *mctx = crypto_shash_ctx(hash); |
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if (keylen != sizeof(u32)) |
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return -EINVAL; |
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*mctx = le32_to_cpup((__le32 *)key); |
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return 0; |
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} |
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static int crc32c_sparc64_init(struct shash_desc *desc) |
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{ |
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u32 *mctx = crypto_shash_ctx(desc->tfm); |
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u32 *crcp = shash_desc_ctx(desc); |
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*crcp = *mctx; |
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return 0; |
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} |
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extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len); |
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static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len) |
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{ |
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unsigned int asm_len; |
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asm_len = len & ~7U; |
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if (asm_len) { |
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crc32c_sparc64(crcp, data, asm_len); |
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data += asm_len / 8; |
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len -= asm_len; |
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} |
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if (len) |
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*crcp = __crc32c_le(*crcp, (const unsigned char *) data, len); |
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} |
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static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data, |
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unsigned int len) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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crc32c_compute(crcp, (const u64 *) data, len); |
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return 0; |
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} |
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static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len, |
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u8 *out) |
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{ |
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u32 tmp = *crcp; |
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crc32c_compute(&tmp, (const u64 *) data, len); |
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*(__le32 *) out = ~cpu_to_le32(tmp); |
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return 0; |
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} |
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static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out); |
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} |
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static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out) |
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{ |
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u32 *crcp = shash_desc_ctx(desc); |
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*(__le32 *) out = ~cpu_to_le32p(crcp); |
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return 0; |
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} |
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static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data, |
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unsigned int len, u8 *out) |
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{ |
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return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len, |
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out); |
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} |
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static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm) |
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{ |
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u32 *key = crypto_tfm_ctx(tfm); |
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*key = ~0; |
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return 0; |
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} |
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#define CHKSUM_BLOCK_SIZE 1 |
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#define CHKSUM_DIGEST_SIZE 4 |
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static struct shash_alg alg = { |
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.setkey = crc32c_sparc64_setkey, |
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.init = crc32c_sparc64_init, |
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.update = crc32c_sparc64_update, |
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.final = crc32c_sparc64_final, |
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.finup = crc32c_sparc64_finup, |
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.digest = crc32c_sparc64_digest, |
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.descsize = sizeof(u32), |
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.digestsize = CHKSUM_DIGEST_SIZE, |
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.base = { |
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.cra_name = "crc32c", |
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.cra_driver_name = "crc32c-sparc64", |
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.cra_priority = SPARC_CR_OPCODE_PRIORITY, |
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.cra_flags = CRYPTO_ALG_OPTIONAL_KEY, |
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.cra_blocksize = CHKSUM_BLOCK_SIZE, |
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.cra_ctxsize = sizeof(u32), |
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.cra_alignmask = 7, |
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.cra_module = THIS_MODULE, |
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.cra_init = crc32c_sparc64_cra_init, |
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} |
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}; |
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static bool __init sparc64_has_crc32c_opcode(void) |
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{ |
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unsigned long cfr; |
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if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO)) |
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return false; |
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__asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr)); |
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if (!(cfr & CFR_CRC32C)) |
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return false; |
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return true; |
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} |
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static int __init crc32c_sparc64_mod_init(void) |
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{ |
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if (sparc64_has_crc32c_opcode()) { |
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pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n"); |
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return crypto_register_shash(&alg); |
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} |
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pr_info("sparc64 crc32c opcode not available.\n"); |
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return -ENODEV; |
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} |
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static void __exit crc32c_sparc64_mod_fini(void) |
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{ |
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crypto_unregister_shash(&alg); |
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} |
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module_init(crc32c_sparc64_mod_init); |
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module_exit(crc32c_sparc64_mod_fini); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated"); |
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MODULE_ALIAS_CRYPTO("crc32c"); |
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#include "crop_devid.c"
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