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 #include <asm/unaligned.h>
  24
  25 #include "opcodes.h"
  26
  27 /*
  28  * Setting the seed allows arbitrary accumulators and flexible XOR policy
  29  * If your algorithm starts with ~0, then XOR with ~0 before you set
  30  * the seed.
  31  */
  32 static int crc32c_sparc64_setkey(struct crypto_shash *hash, const u8 *key,
  33                                  unsigned int keylen)
  34 {
  35         u32 *mctx = crypto_shash_ctx(hash);
  36
  37         if (keylen != sizeof(u32))
  38                 return -EINVAL;
  39         *mctx = get_unaligned_le32(key);
  40         return 0;
  41 }
  42
  43 static int crc32c_sparc64_init(struct shash_desc *desc)
  44 {
  45         u32 *mctx = crypto_shash_ctx(desc->tfm);
  46         u32 *crcp = shash_desc_ctx(desc);
  47
  48         *crcp = *mctx;
  49
  50         return 0;
  51 }
  52
  53 extern void crc32c_sparc64(u32 *crcp, const u64 *data, unsigned int len);
  54
  55 static u32 crc32c_compute(u32 crc, const u8 *data, unsigned int len)
  56 {
  57         unsigned int n = -(uintptr_t)data & 7;
  58
  59         if (n) {
  60                 /* Data isn't 8-byte aligned.  Align it. */
  61                 n = min(n, len);
  62                 crc = __crc32c_le(crc, data, n);
  63                 data += n;
  64                 len -= n;
  65         }
  66         n = len & ~7U;
  67         if (n) {
  68                 crc32c_sparc64(&crc, (const u64 *)data, n);
  69                 data += n;
  70                 len -= n;
  71         }
  72         if (len)
  73                 crc = __crc32c_le(crc, data, len);
  74         return crc;
  75 }
  76
  77 static int crc32c_sparc64_update(struct shash_desc *desc, const u8 *data,
  78                                  unsigned int len)
  79 {
  80         u32 *crcp = shash_desc_ctx(desc);
  81
  82         *crcp = crc32c_compute(*crcp, data, len);
  83         return 0;
  84 }
  85
  86 static int __crc32c_sparc64_finup(const u32 *crcp, const u8 *data,
  87                                   unsigned int len, u8 *out)
  88 {
  89         put_unaligned_le32(~crc32c_compute(*crcp, data, len), out);
  90         return 0;
  91 }
  92
  93 static int crc32c_sparc64_finup(struct shash_desc *desc, const u8 *data,
  94                                 unsigned int len, u8 *out)
  95 {
  96         return __crc32c_sparc64_finup(shash_desc_ctx(desc), data, len, out);
  97 }
  98
  99 static int crc32c_sparc64_final(struct shash_desc *desc, u8 *out)
 100 {
 101         u32 *crcp = shash_desc_ctx(desc);
 102
 103         put_unaligned_le32(~*crcp, out);
 104         return 0;
 105 }
 106
 107 static int crc32c_sparc64_digest(struct shash_desc *desc, const u8 *data,
 108                                  unsigned int len, u8 *out)
 109 {
 110         return __crc32c_sparc64_finup(crypto_shash_ctx(desc->tfm), data, len,
 111                                       out);
 112 }
 113
 114 static int crc32c_sparc64_cra_init(struct crypto_tfm *tfm)
 115 {
 116         u32 *key = crypto_tfm_ctx(tfm);
 117
 118         *key = ~0;
 119
 120         return 0;
 121 }
 122
 123 #define CHKSUM_BLOCK_SIZE       1
 124 #define CHKSUM_DIGEST_SIZE      4
 125
 126 static struct shash_alg alg = {
 127         .setkey                 =       crc32c_sparc64_setkey,
 128         .init                   =       crc32c_sparc64_init,
 129         .update                 =       crc32c_sparc64_update,
 130         .final                  =       crc32c_sparc64_final,
 131         .finup                  =       crc32c_sparc64_finup,
 132         .digest                 =       crc32c_sparc64_digest,
 133         .descsize               =       sizeof(u32),
 134         .digestsize             =       CHKSUM_DIGEST_SIZE,
 135         .base                   =       {
 136                 .cra_name               =       "crc32c",
 137                 .cra_driver_name        =       "crc32c-sparc64",
 138                 .cra_priority           =       SPARC_CR_OPCODE_PRIORITY,
 139                 .cra_flags              =       CRYPTO_ALG_OPTIONAL_KEY,
 140                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
 141                 .cra_ctxsize            =       sizeof(u32),
 142                 .cra_module             =       THIS_MODULE,
 143                 .cra_init               =       crc32c_sparc64_cra_init,
 144         }
 145 };
 146
 147 static bool __init sparc64_has_crc32c_opcode(void)
 148 {
 149         unsigned long cfr;
 150
 151         if (!(sparc64_elf_hwcap & HWCAP_SPARC_CRYPTO))
 152                 return false;
 153
 154         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 155         if (!(cfr & CFR_CRC32C))
 156                 return false;
 157
 158         return true;
 159 }
 160
 161 static int __init crc32c_sparc64_mod_init(void)
 162 {
 163         if (sparc64_has_crc32c_opcode()) {
 164                 pr_info("Using sparc64 crc32c opcode optimized CRC32C implementation\n");
 165                 return crypto_register_shash(&alg);
 166         }
 167         pr_info("sparc64 crc32c opcode not available.\n");
 168         return -ENODEV;
 169 }
 170
 171 static void __exit crc32c_sparc64_mod_fini(void)
 172 {
 173         crypto_unregister_shash(&alg);
 174 }
 175
 176 module_init(crc32c_sparc64_mod_init);
 177 module_exit(crc32c_sparc64_mod_fini);
 178
 179 MODULE_LICENSE("GPL");
 180 MODULE_DESCRIPTION("CRC32c (Castagnoli), sparc64 crc32c opcode accelerated");
 181
 182 MODULE_ALIAS_CRYPTO("crc32c");
 183
 184 #include "crop_devid.c"