sparc/crypto/crc32c_glue.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /* Glue code for CRC32C optimized for sparc64 crypto opcodes.
0003  *
0004  * This is based largely upon arch/x86/crypto/crc32c-intel.c
0005  *
0006  * Copyright (C) 2008 Intel Corporation
0007  * Authors: Austin Zhang <austin_zhang@linux.intel.com>
0008  *          Kent Liu <kent.liu@intel.com>
0009  */
0010
0011 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
0012
0013 #include <linux/init.h>
0014 #include <linux/module.h>
0015 #include <linux/string.h>
0016 #include <linux/kernel.h>
0017 #include <linux/crc32.h>
0018
0019 #include <crypto/internal/hash.h>
0020
0021 #include <asm/pstate.h>
0022 #include <asm/elf.h>
0023
0024 #include "opcodes.h"
0025
0026 /*
0027  * Setting the seed allows arbitrary accumulators and flexible XOR policy
0028  * If your algorithm starts with ~0, then XOR with ~0 before you set
0029  * the seed.
0030  */
0031 static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
0032                  unsigned int keylen)
0033 {
0034     u32 *mctx = crypto_shash_ctx(hash);
0035
0036     if (keylen != sizeof(u32))
0037         return -EINVAL;
0038     *mctx = le32_to_cpup((__le32 *)key);
0039     return 0;
0040 }
0041
0042 static int crc32c_sparc64_init(struct shash_desc *desc)
0043 {
0044     u32 *mctx = crypto_shash_ctx(desc->tfm);
0045     u32 *crcp = shash_desc_ctx(desc);
0046
0047     *crcp = *mctx;
0048
0049     return 0;
0050 }
0051
0052 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
0053
0054 static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
0055 {
0056     unsigned int asm_len;
0057
0058     asm_len = len & ~7U;
0059     if (asm_len) {
0060         crc32c_sparc64(crcp, data, asm_len);
0061         data += asm_len / 8;
0062         len -= asm_len;
0063     }
0064     if (len)
0065         *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
0066 }
0067
0068 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
0069                  unsigned int len)
0070 {
0071     u32 *crcp = shash_desc_ctx(desc);
0072
0073     crc32c_compute(crcp, (const u64 *) data, len);
0074
0075     return 0;
0076 }
0077
0078 static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
0079                   u8 *out)
0080 {
0081     u32 tmp = *crcp;
0082
0083     crc32c_compute(&tmp, (const u64 *) data, len);
0084
0085     *(__le32 *) out = ~cpu_to_le32(tmp);
0086     return 0;
0087 }
0088
0089 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
0090                 unsigned int len, u8 *out)
0091 {
0092     return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
0093 }
0094
0095 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
0096 {
0097     u32 *crcp = shash_desc_ctx(desc);
0098
0099     *(__le32 *) out = ~cpu_to_le32p(crcp);
0100     return 0;
0101 }
0102
0103 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
0104                  unsigned int len, u8 *out)
0105 {
0106     return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
0107                       out);
0108 }
0109
0110 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
0111 {
0112     u32 *key = crypto_tfm_ctx(tfm);
0113
0114     *key = ~0;
0115
0116     return 0;
0117 }
0118
0119 #define CHKSUM_BLOCK_SIZE   1
0120 #define CHKSUM_DIGEST_SIZE  4
0121
0122 static struct shash_alg alg = {
0123     .setkey         =   crc32c_sparc64_setkey,
0124     .init           =   crc32c_sparc64_init,
0125     .update         =   crc32c_sparc64_update,
0126     .final          =   crc32c_sparc64_final,
0127     .finup          =   crc32c_sparc64_finup,
0128     .digest         =   crc32c_sparc64_digest,
0129     .descsize       =   sizeof(u32),
0130     .digestsize     =   CHKSUM_DIGEST_SIZE,
0131     .base           =   {
0132         .cra_name       =   "crc32c",
0133         .cra_driver_name    =   "crc32c-sparc64",
0134         .cra_priority       =   SPARC_CR_OPCODE_PRIORITY,
0135         .cra_flags      =   CRYPTO_ALG_OPTIONAL_KEY,
0136         .cra_blocksize      =   CHKSUM_BLOCK_SIZE,
0137         .cra_ctxsize        =   sizeof(u32),
0138         .cra_alignmask      =   7,
0139         .cra_module     =   THIS_MODULE,
0140         .cra_init       =   crc32c_sparc64_cra_init,
0141     }
0142 };
0143
0144 static bool __init sparc64_has_crc32c_opcode(void)
0145 {
0146     unsigned long cfr;
0147
0148     if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
0149         return false;
0150
0151     __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
0152     if (!(cfr & CFR_CRC32C))
0153         return false;
0154
0155     return true;
0156 }
0157
0158 static int __init crc32c_sparc64_mod_init(void)
0159 {
0160     if (sparc64_has_crc32c_opcode()) {
0161         pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
0162         return crypto_register_shash(&alg);
0163     }
0164     pr_info("sparc64 crc32c opcode not available.\n");
0165     return -ENODEV;
0166 }
0167
0168 static void __exit crc32c_sparc64_mod_fini(void)
0169 {
0170     crypto_unregister_shash(&alg);
0171 }
0172
0173 module_init(crc32c_sparc64_mod_init);
0174 module_exit(crc32c_sparc64_mod_fini);
0175
0176 MODULE_LICENSE("GPL");
0177 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
0178
0179 MODULE_ALIAS_CRYPTO("crc32c");
0180
0181 #include "crop_devid.c"