arch/sparc/crypto/crc32c_glue.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /* Glue code for CRC32C optimized for sparc64 crypto opcodes.
   3  *
   4  * This is based largely upon arch/x86/crypto/crc32c-intel.c
   5  *
   6  * Copyright (C) 2008 Intel Corporation
   7  * Authors: Austin Zhang <[email protected]>
   8  *          Kent Liu <[email protected]>
   9  */
  10
  11 #define pr_fmt(fmt)     KBUILD_MODNAME ": " fmt
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/string.h>
  16 #include <linux/kernel.h>
  17 #include <linux/crc32.h>
  18
  19 #include <crypto/internal/hash.h>
  20
  21 #include <asm/pstate.h>
  22 #include <asm/elf.h>
  23
  24 #include "opcodes.h"
  25
  26 /*
  27  * Setting the seed allows arbitrary accumulators and flexible XOR policy
  28  * If your algorithm starts with ~0, then XOR with ~0 before you set
  29  * the seed.
  30  */
  31 static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
  32                                  unsigned int keylen)
  33 {
  34         u32 *mctx = crypto_shash_ctx(hash);
  35
  36         if (keylen != sizeof(u32))
  37                 return -EINVAL;
  38         *mctx = le32_to_cpup((__le32 *)key);
  39         return 0;
  40 }
  41
  42 static int crc32c_sparc64_init(struct shash_desc *desc)
  43 {
  44         u32 *mctx = crypto_shash_ctx(desc->tfm);
  45         u32 *crcp = shash_desc_ctx(desc);
  46
  47         *crcp = *mctx;
  48
  49         return 0;
  50 }
  51
  52 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
  53
  54 static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
  55 {
  56         unsigned int asm_len;
  57
  58         asm_len = len & ~7U;
  59         if (asm_len) {
  60                 crc32c_sparc64(crcp, data, asm_len);
  61                 data += asm_len / 8;
  62                 len -= asm_len;
  63         }
  64         if (len)
  65                 *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
  66 }
  67
  68 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
  69                                  unsigned int len)
  70 {
  71         u32 *crcp = shash_desc_ctx(desc);
  72
  73         crc32c_compute(crcp, (const u64 *) data, len);
  74
  75         return 0;
  76 }
  77
  78 static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
  79                                   u8 *out)
  80 {
  81         u32 tmp = *crcp;
  82
  83         crc32c_compute(&tmp, (const u64 *) data, len);
  84
  85         *(__le32 *) out = ~cpu_to_le32(tmp);
  86         return 0;
  87 }
  88
  89 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
  90                                 unsigned int len, u8 *out)
  91 {
  92         return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
  93 }
  94
  95 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
  96 {
  97         u32 *crcp = shash_desc_ctx(desc);
  98
  99         *(__le32 *) out = ~cpu_to_le32p(crcp);
 100         return 0;
 101 }
 102
 103 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
 104                                  unsigned int len, u8 *out)
 105 {
 106         return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
 107                                       out);
 108 }
 109
 110 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
 111 {
 112         u32 *key = crypto_tfm_ctx(tfm);
 113
 114         *key = ~0;
 115
 116         return 0;
 117 }
 118
 119 #define CHKSUM_BLOCK_SIZE       1
 120 #define CHKSUM_DIGEST_SIZE      4
 121
 122 static struct shash_alg alg = {
 123         .setkey                 =       crc32c_sparc64_setkey,
 124         .init                   =       crc32c_sparc64_init,
 125         .update                 =       crc32c_sparc64_update,
 126         .final                  =       crc32c_sparc64_final,
 127         .finup                  =       crc32c_sparc64_finup,
 128         .digest                 =       crc32c_sparc64_digest,
 129         .descsize               =       sizeof(u32),
 130         .digestsize             =       CHKSUM_DIGEST_SIZE,
 131         .base                   =       {
 132                 .cra_name               =       "crc32c",
 133                 .cra_driver_name        =       "crc32c-sparc64",
 134                 .cra_priority           =       SPARC_CR_OPCODE_PRIORITY,
 135                 .cra_flags              =       CRYPTO_ALG_OPTIONAL_KEY,
 136                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
 137                 .cra_ctxsize            =       sizeof(u32),
 138                 .cra_alignmask          =       7,
 139                 .cra_module             =       THIS_MODULE,
 140                 .cra_init               =       crc32c_sparc64_cra_init,
 141         }
 142 };
 143
 144 static bool __init sparc64_has_crc32c_opcode(void)
 145 {
 146         unsigned long cfr;
 147
 148         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 149                 return false;
 150
 151         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 152         if (!(cfr & CFR_CRC32C))
 153                 return false;
 154
 155         return true;
 156 }
 157
 158 static int __init crc32c_sparc64_mod_init(void)
 159 {
 160         if (sparc64_has_crc32c_opcode()) {
 161                 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
 162                 return crypto_register_shash(&alg);
 163         }
 164         pr_info("sparc64 crc32c opcode not available.\n");
 165         return -ENODEV;
 166 }
 167
 168 static void __exit crc32c_sparc64_mod_fini(void)
 169 {
 170         crypto_unregister_shash(&alg);
 171 }
 172
 173 module_init(crc32c_sparc64_mod_init);
 174 module_exit(crc32c_sparc64_mod_fini);
 175
 176 MODULE_LICENSE("GPL");
 177 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
 178
 179 MODULE_ALIAS_CRYPTO("crc32c");
 180
 181 #include "crop_devid.c"