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 <austin_zhang@linux.intel.com>
   8  *          Kent Liu <kent.liu@intel.com>
   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                 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
  38                 return -EINVAL;
  39         }
  40         *(__le32 *)mctx = le32_to_cpup((__le32 *)key);
  41         return 0;
  42 }
  43
  44 static int crc32c_sparc64_init(struct shash_desc *desc)
  45 {
  46         u32 *mctx = crypto_shash_ctx(desc->tfm);
  47         u32 *crcp = shash_desc_ctx(desc);
  48
  49         *crcp = *mctx;
  50
  51         return 0;
  52 }
  53
  54 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
  55
  56 static void crc32c_compute(u32 *crcp, const u64 *data, unsigned int len)
  57 {
  58         unsigned int asm_len;
  59
  60         asm_len = len & ~7U;
  61         if (asm_len) {
  62                 crc32c_sparc64(crcp, data, asm_len);
  63                 data += asm_len / 8;
  64                 len -= asm_len;
  65         }
  66         if (len)
  67                 *crcp = __crc32c_le(*crcp, (const unsigned char *) data, len);
  68 }
  69
  70 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
  71                                  unsigned int len)
  72 {
  73         u32 *crcp = shash_desc_ctx(desc);
  74
  75         crc32c_compute(crcp, (const u64 *) data, len);
  76
  77         return 0;
  78 }
  79
  80 static int __crc32c_sparc64_finup(u32 *crcp, const u8 *data, unsigned int len,
  81                                   u8 *out)
  82 {
  83         u32 tmp = *crcp;
  84
  85         crc32c_compute(&tmp, (const u64 *) data, len);
  86
  87         *(__le32 *) out = ~cpu_to_le32(tmp);
  88         return 0;
  89 }
  90
  91 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
  92                                 unsigned int len, u8 *out)
  93 {
  94         return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
  95 }
  96
  97 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
  98 {
  99         u32 *crcp = shash_desc_ctx(desc);
 100
 101         *(__le32 *) out = ~cpu_to_le32p(crcp);
 102         return 0;
 103 }
 104
 105 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
 106                                  unsigned int len, u8 *out)
 107 {
 108         return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
 109                                       out);
 110 }
 111
 112 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
 113 {
 114         u32 *key = crypto_tfm_ctx(tfm);
 115
 116         *key = ~0;
 117
 118         return 0;
 119 }
 120
 121 #define CHKSUM_BLOCK_SIZE       1
 122 #define CHKSUM_DIGEST_SIZE      4
 123
 124 static struct shash_alg alg = {
 125         .setkey                 =       crc32c_sparc64_setkey,
 126         .init                   =       crc32c_sparc64_init,
 127         .update                 =       crc32c_sparc64_update,
 128         .final                  =       crc32c_sparc64_final,
 129         .finup                  =       crc32c_sparc64_finup,
 130         .digest                 =       crc32c_sparc64_digest,
 131         .descsize               =       sizeof(u32),
 132         .digestsize             =       CHKSUM_DIGEST_SIZE,
 133         .base                   =       {
 134                 .cra_name               =       "crc32c",
 135                 .cra_driver_name        =       "crc32c-sparc64",
 136                 .cra_priority           =       SPARC_CR_OPCODE_PRIORITY,
 137                 .cra_flags              =       CRYPTO_ALG_OPTIONAL_KEY,
 138                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
 139                 .cra_ctxsize            =       sizeof(u32),
 140                 .cra_alignmask          =       7,
 141                 .cra_module             =       THIS_MODULE,
 142                 .cra_init               =       crc32c_sparc64_cra_init,
 143         }
 144 };
 145
 146 static bool __init sparc64_has_crc32c_opcode(void)
 147 {
 148         unsigned long cfr;
 149
 150         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 151                 return false;
 152
 153         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 154         if (!(cfr & CFR_CRC32C))
 155                 return false;
 156
 157         return true;
 158 }
 159
 160 static int __init crc32c_sparc64_mod_init(void)
 161 {
 162         if (sparc64_has_crc32c_opcode()) {
 163                 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
 164                 return crypto_register_shash(&alg);
 165         }
 166         pr_info("sparc64 crc32c opcode not available.\n");
 167         return -ENODEV;
 168 }
 169
 170 static void __exit crc32c_sparc64_mod_fini(void)
 171 {
 172         crypto_unregister_shash(&alg);
 173 }
 174
 175 module_init(crc32c_sparc64_mod_init);
 176 module_exit(crc32c_sparc64_mod_fini);
 177
 178 MODULE_LICENSE("GPL");
 179 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
 180
 181 MODULE_ALIAS_CRYPTO("crc32c");
 182
 183 #include "crop_devid.c"