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Linux/arch/x86/crypto/crc32c-intel.c

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  1 /*
  2  * Using hardware provided CRC32 instruction to accelerate the CRC32 disposal.
  3  * CRC32C polynomial:0x1EDC6F41(BE)/0x82F63B78(LE)
  4  * CRC32 is a new instruction in Intel SSE4.2, the reference can be found at:
  5  * http://www.intel.com/products/processor/manuals/
  6  * Intel(R) 64 and IA-32 Architectures Software Developer's Manual
  7  * Volume 2A: Instruction Set Reference, A-M
  8  *
  9  * Copyright (C) 2008 Intel Corporation
 10  * Authors: Austin Zhang <austin_zhang@linux.intel.com>
 11  *          Kent Liu <kent.liu@intel.com>
 12  *
 13  * This program is free software; you can redistribute it and/or modify it
 14  * under the terms and conditions of the GNU General Public License,
 15  * version 2, as published by the Free Software Foundation.
 16  *
 17  * This program is distributed in the hope it will be useful, but WITHOUT
 18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 20  * more details.
 21  *
 22  * You should have received a copy of the GNU General Public License along with
 23  * this program; if not, write to the Free Software Foundation, Inc.,
 24  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
 25  *
 26  */
 27 #include <linux/init.h>
 28 #include <linux/module.h>
 29 #include <linux/string.h>
 30 #include <linux/kernel.h>
 31 #include <crypto/internal/hash.h>
 32 
 33 #include <asm/cpufeature.h>
 34 #include <asm/cpu_device_id.h>
 35 
 36 #define CHKSUM_BLOCK_SIZE       1
 37 #define CHKSUM_DIGEST_SIZE      4
 38 
 39 #define SCALE_F sizeof(unsigned long)
 40 
 41 #ifdef CONFIG_X86_64
 42 #define REX_PRE "0x48, "
 43 #else
 44 #define REX_PRE
 45 #endif
 46 
 47 static u32 crc32c_intel_le_hw_byte(u32 crc, unsigned char const *data, size_t length)
 48 {
 49         while (length--) {
 50                 __asm__ __volatile__(
 51                         ".byte 0xf2, 0xf, 0x38, 0xf0, 0xf1"
 52                         :"=S"(crc)
 53                         :""(crc), "c"(*data)
 54                 );
 55                 data++;
 56         }
 57 
 58         return crc;
 59 }
 60 
 61 static u32 __pure crc32c_intel_le_hw(u32 crc, unsigned char const *p, size_t len)
 62 {
 63         unsigned int iquotient = len / SCALE_F;
 64         unsigned int iremainder = len % SCALE_F;
 65         unsigned long *ptmp = (unsigned long *)p;
 66 
 67         while (iquotient--) {
 68                 __asm__ __volatile__(
 69                         ".byte 0xf2, " REX_PRE "0xf, 0x38, 0xf1, 0xf1;"
 70                         :"=S"(crc)
 71                         :""(crc), "c"(*ptmp)
 72                 );
 73                 ptmp++;
 74         }
 75 
 76         if (iremainder)
 77                 crc = crc32c_intel_le_hw_byte(crc, (unsigned char *)ptmp,
 78                                  iremainder);
 79 
 80         return crc;
 81 }
 82 
 83 /*
 84  * Setting the seed allows arbitrary accumulators and flexible XOR policy
 85  * If your algorithm starts with ~0, then XOR with ~0 before you set
 86  * the seed.
 87  */
 88 static int crc32c_intel_setkey(struct crypto_shash *hash, const u8 *key,
 89                         unsigned int keylen)
 90 {
 91         u32 *mctx = crypto_shash_ctx(hash);
 92 
 93         if (keylen != sizeof(u32)) {
 94                 crypto_shash_set_flags(hash, CRYPTO_TFM_RES_BAD_KEY_LEN);
 95                 return -EINVAL;
 96         }
 97         *mctx = le32_to_cpup((__le32 *)key);
 98         return 0;
 99 }
100 
101 static int crc32c_intel_init(struct shash_desc *desc)
102 {
103         u32 *mctx = crypto_shash_ctx(desc->tfm);
104         u32 *crcp = shash_desc_ctx(desc);
105 
106         *crcp = *mctx;
107 
108         return 0;
109 }
110 
111 static int crc32c_intel_update(struct shash_desc *desc, const u8 *data,
112                                unsigned int len)
113 {
114         u32 *crcp = shash_desc_ctx(desc);
115 
116         *crcp = crc32c_intel_le_hw(*crcp, data, len);
117         return 0;
118 }
119 
120 static int __crc32c_intel_finup(u32 *crcp, const u8 *data, unsigned int len,
121                                 u8 *out)
122 {
123         *(__le32 *)out = ~cpu_to_le32(crc32c_intel_le_hw(*crcp, data, len));
124         return 0;
125 }
126 
127 static int crc32c_intel_finup(struct shash_desc *desc, const u8 *data,
128                               unsigned int len, u8 *out)
129 {
130         return __crc32c_intel_finup(shash_desc_ctx(desc), data, len, out);
131 }
132 
133 static int crc32c_intel_final(struct shash_desc *desc, u8 *out)
134 {
135         u32 *crcp = shash_desc_ctx(desc);
136 
137         *(__le32 *)out = ~cpu_to_le32p(crcp);
138         return 0;
139 }
140 
141 static int crc32c_intel_digest(struct shash_desc *desc, const u8 *data,
142                                unsigned int len, u8 *out)
143 {
144         return __crc32c_intel_finup(crypto_shash_ctx(desc->tfm), data, len,
145                                     out);
146 }
147 
148 static int crc32c_intel_cra_init(struct crypto_tfm *tfm)
149 {
150         u32 *key = crypto_tfm_ctx(tfm);
151 
152         *key = ~0;
153 
154         return 0;
155 }
156 
157 static struct shash_alg alg = {
158         .setkey                 =       crc32c_intel_setkey,
159         .init                   =       crc32c_intel_init,
160         .update                 =       crc32c_intel_update,
161         .final                  =       crc32c_intel_final,
162         .finup                  =       crc32c_intel_finup,
163         .digest                 =       crc32c_intel_digest,
164         .descsize               =       sizeof(u32),
165         .digestsize             =       CHKSUM_DIGEST_SIZE,
166         .base                   =       {
167                 .cra_name               =       "crc32c",
168                 .cra_driver_name        =       "crc32c-intel",
169                 .cra_priority           =       200,
170                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
171                 .cra_ctxsize            =       sizeof(u32),
172                 .cra_module             =       THIS_MODULE,
173                 .cra_init               =       crc32c_intel_cra_init,
174         }
175 };
176 
177 static const struct x86_cpu_id crc32c_cpu_id[] = {
178         X86_FEATURE_MATCH(X86_FEATURE_XMM4_2),
179         {}
180 };
181 MODULE_DEVICE_TABLE(x86cpu, crc32c_cpu_id);
182 
183 static int __init crc32c_intel_mod_init(void)
184 {
185         if (!x86_match_cpu(crc32c_cpu_id))
186                 return -ENODEV;
187         return crypto_register_shash(&alg);
188 }
189 
190 static void __exit crc32c_intel_mod_fini(void)
191 {
192         crypto_unregister_shash(&alg);
193 }
194 
195 module_init(crc32c_intel_mod_init);
196 module_exit(crc32c_intel_mod_fini);
197 
198 MODULE_AUTHOR("Austin Zhang <austin.zhang@intel.com>, Kent Liu <kent.liu@intel.com>");
199 MODULE_DESCRIPTION("CRC32c (Castagnoli) optimization using Intel Hardware.");
200 MODULE_LICENSE("GPL");
201 
202 MODULE_ALIAS("crc32c");
203 MODULE_ALIAS("crc32c-intel");
204 

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