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Linux/arch/mips/crypto/crc32-mips.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * crc32-mips.c - CRC32 and CRC32C using optional MIPSr6 instructions
  4  *
  5  * Module based on arm64/crypto/crc32-arm.c
  6  *
  7  * Copyright (C) 2014 Linaro Ltd <yazen.ghannam@linaro.org>
  8  * Copyright (C) 2018 MIPS Tech, LLC
  9  */
 10 
 11 #include <linux/unaligned/access_ok.h>
 12 #include <linux/cpufeature.h>
 13 #include <linux/init.h>
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/string.h>
 17 #include <asm/mipsregs.h>
 18 
 19 #include <crypto/internal/hash.h>
 20 
 21 enum crc_op_size {
 22         b, h, w, d,
 23 };
 24 
 25 enum crc_type {
 26         crc32,
 27         crc32c,
 28 };
 29 
 30 #ifndef TOOLCHAIN_SUPPORTS_CRC
 31 #define _ASM_MACRO_CRC32(OP, SZ, TYPE)                                    \
 32 _ASM_MACRO_3R(OP, rt, rs, rt2,                                            \
 33         ".ifnc  \\rt, \\rt2\n\t"                                          \
 34         ".error \"invalid operands \\\"" #OP " \\rt,\\rs,\\rt2\\\"\"\n\t" \
 35         ".endif\n\t"                                                      \
 36         _ASM_INSN_IF_MIPS(0x7c00000f | (__rt << 16) | (__rs << 21) |      \
 37                           ((SZ) <<  6) | ((TYPE) << 8))                   \
 38         _ASM_INSN32_IF_MM(0x00000030 | (__rs << 16) | (__rt << 21) |      \
 39                           ((SZ) << 14) | ((TYPE) << 3)))
 40 _ASM_MACRO_CRC32(crc32b,  0, 0);
 41 _ASM_MACRO_CRC32(crc32h,  1, 0);
 42 _ASM_MACRO_CRC32(crc32w,  2, 0);
 43 _ASM_MACRO_CRC32(crc32d,  3, 0);
 44 _ASM_MACRO_CRC32(crc32cb, 0, 1);
 45 _ASM_MACRO_CRC32(crc32ch, 1, 1);
 46 _ASM_MACRO_CRC32(crc32cw, 2, 1);
 47 _ASM_MACRO_CRC32(crc32cd, 3, 1);
 48 #define _ASM_SET_CRC ""
 49 #else /* !TOOLCHAIN_SUPPORTS_CRC */
 50 #define _ASM_SET_CRC ".set\tcrc\n\t"
 51 #endif
 52 
 53 #define _CRC32(crc, value, size, type)          \
 54 do {                                            \
 55         __asm__ __volatile__(                   \
 56                 ".set   push\n\t"               \
 57                 _ASM_SET_CRC                    \
 58                 #type #size "   %0, %1, %0\n\t" \
 59                 ".set   pop"                    \
 60                 : "+r" (crc)                    \
 61                 : "r" (value));                 \
 62 } while (0)
 63 
 64 #define CRC32(crc, value, size) \
 65         _CRC32(crc, value, size, crc32)
 66 
 67 #define CRC32C(crc, value, size) \
 68         _CRC32(crc, value, size, crc32c)
 69 
 70 static u32 crc32_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
 71 {
 72         u32 crc = crc_;
 73 
 74 #ifdef CONFIG_64BIT
 75         while (len >= sizeof(u64)) {
 76                 u64 value = get_unaligned_le64(p);
 77 
 78                 CRC32(crc, value, d);
 79                 p += sizeof(u64);
 80                 len -= sizeof(u64);
 81         }
 82 
 83         if (len & sizeof(u32)) {
 84 #else /* !CONFIG_64BIT */
 85         while (len >= sizeof(u32)) {
 86 #endif
 87                 u32 value = get_unaligned_le32(p);
 88 
 89                 CRC32(crc, value, w);
 90                 p += sizeof(u32);
 91                 len -= sizeof(u32);
 92         }
 93 
 94         if (len & sizeof(u16)) {
 95                 u16 value = get_unaligned_le16(p);
 96 
 97                 CRC32(crc, value, h);
 98                 p += sizeof(u16);
 99         }
100 
101         if (len & sizeof(u8)) {
102                 u8 value = *p++;
103 
104                 CRC32(crc, value, b);
105         }
106 
107         return crc;
108 }
109 
110 static u32 crc32c_mips_le_hw(u32 crc_, const u8 *p, unsigned int len)
111 {
112         u32 crc = crc_;
113 
114 #ifdef CONFIG_64BIT
115         while (len >= sizeof(u64)) {
116                 u64 value = get_unaligned_le64(p);
117 
118                 CRC32C(crc, value, d);
119                 p += sizeof(u64);
120                 len -= sizeof(u64);
121         }
122 
123         if (len & sizeof(u32)) {
124 #else /* !CONFIG_64BIT */
125         while (len >= sizeof(u32)) {
126 #endif
127                 u32 value = get_unaligned_le32(p);
128 
129                 CRC32C(crc, value, w);
130                 p += sizeof(u32);
131                 len -= sizeof(u32);
132         }
133 
134         if (len & sizeof(u16)) {
135                 u16 value = get_unaligned_le16(p);
136 
137                 CRC32C(crc, value, h);
138                 p += sizeof(u16);
139         }
140 
141         if (len & sizeof(u8)) {
142                 u8 value = *p++;
143 
144                 CRC32C(crc, value, b);
145         }
146         return crc;
147 }
148 
149 #define CHKSUM_BLOCK_SIZE       1
150 #define CHKSUM_DIGEST_SIZE      4
151 
152 struct chksum_ctx {
153         u32 key;
154 };
155 
156 struct chksum_desc_ctx {
157         u32 crc;
158 };
159 
160 static int chksum_init(struct shash_desc *desc)
161 {
162         struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
163         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
164 
165         ctx->crc = mctx->key;
166 
167         return 0;
168 }
169 
170 /*
171  * Setting the seed allows arbitrary accumulators and flexible XOR policy
172  * If your algorithm starts with ~0, then XOR with ~0 before you set
173  * the seed.
174  */
175 static int chksum_setkey(struct crypto_shash *tfm, const u8 *key,
176                          unsigned int keylen)
177 {
178         struct chksum_ctx *mctx = crypto_shash_ctx(tfm);
179 
180         if (keylen != sizeof(mctx->key))
181                 return -EINVAL;
182         mctx->key = get_unaligned_le32(key);
183         return 0;
184 }
185 
186 static int chksum_update(struct shash_desc *desc, const u8 *data,
187                          unsigned int length)
188 {
189         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
190 
191         ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
192         return 0;
193 }
194 
195 static int chksumc_update(struct shash_desc *desc, const u8 *data,
196                          unsigned int length)
197 {
198         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
199 
200         ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
201         return 0;
202 }
203 
204 static int chksum_final(struct shash_desc *desc, u8 *out)
205 {
206         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
207 
208         put_unaligned_le32(ctx->crc, out);
209         return 0;
210 }
211 
212 static int chksumc_final(struct shash_desc *desc, u8 *out)
213 {
214         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
215 
216         put_unaligned_le32(~ctx->crc, out);
217         return 0;
218 }
219 
220 static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
221 {
222         put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
223         return 0;
224 }
225 
226 static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
227 {
228         put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
229         return 0;
230 }
231 
232 static int chksum_finup(struct shash_desc *desc, const u8 *data,
233                         unsigned int len, u8 *out)
234 {
235         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
236 
237         return __chksum_finup(ctx->crc, data, len, out);
238 }
239 
240 static int chksumc_finup(struct shash_desc *desc, const u8 *data,
241                         unsigned int len, u8 *out)
242 {
243         struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
244 
245         return __chksumc_finup(ctx->crc, data, len, out);
246 }
247 
248 static int chksum_digest(struct shash_desc *desc, const u8 *data,
249                          unsigned int length, u8 *out)
250 {
251         struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
252 
253         return __chksum_finup(mctx->key, data, length, out);
254 }
255 
256 static int chksumc_digest(struct shash_desc *desc, const u8 *data,
257                          unsigned int length, u8 *out)
258 {
259         struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
260 
261         return __chksumc_finup(mctx->key, data, length, out);
262 }
263 
264 static int chksum_cra_init(struct crypto_tfm *tfm)
265 {
266         struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
267 
268         mctx->key = ~0;
269         return 0;
270 }
271 
272 static struct shash_alg crc32_alg = {
273         .digestsize             =       CHKSUM_DIGEST_SIZE,
274         .setkey                 =       chksum_setkey,
275         .init                   =       chksum_init,
276         .update                 =       chksum_update,
277         .final                  =       chksum_final,
278         .finup                  =       chksum_finup,
279         .digest                 =       chksum_digest,
280         .descsize               =       sizeof(struct chksum_desc_ctx),
281         .base                   =       {
282                 .cra_name               =       "crc32",
283                 .cra_driver_name        =       "crc32-mips-hw",
284                 .cra_priority           =       300,
285                 .cra_flags              =       CRYPTO_ALG_OPTIONAL_KEY,
286                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
287                 .cra_alignmask          =       0,
288                 .cra_ctxsize            =       sizeof(struct chksum_ctx),
289                 .cra_module             =       THIS_MODULE,
290                 .cra_init               =       chksum_cra_init,
291         }
292 };
293 
294 static struct shash_alg crc32c_alg = {
295         .digestsize             =       CHKSUM_DIGEST_SIZE,
296         .setkey                 =       chksum_setkey,
297         .init                   =       chksum_init,
298         .update                 =       chksumc_update,
299         .final                  =       chksumc_final,
300         .finup                  =       chksumc_finup,
301         .digest                 =       chksumc_digest,
302         .descsize               =       sizeof(struct chksum_desc_ctx),
303         .base                   =       {
304                 .cra_name               =       "crc32c",
305                 .cra_driver_name        =       "crc32c-mips-hw",
306                 .cra_priority           =       300,
307                 .cra_flags              =       CRYPTO_ALG_OPTIONAL_KEY,
308                 .cra_blocksize          =       CHKSUM_BLOCK_SIZE,
309                 .cra_alignmask          =       0,
310                 .cra_ctxsize            =       sizeof(struct chksum_ctx),
311                 .cra_module             =       THIS_MODULE,
312                 .cra_init               =       chksum_cra_init,
313         }
314 };
315 
316 static int __init crc32_mod_init(void)
317 {
318         int err;
319 
320         err = crypto_register_shash(&crc32_alg);
321 
322         if (err)
323                 return err;
324 
325         err = crypto_register_shash(&crc32c_alg);
326 
327         if (err) {
328                 crypto_unregister_shash(&crc32_alg);
329                 return err;
330         }
331 
332         return 0;
333 }
334 
335 static void __exit crc32_mod_exit(void)
336 {
337         crypto_unregister_shash(&crc32_alg);
338         crypto_unregister_shash(&crc32c_alg);
339 }
340 
341 MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
342 MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
343 MODULE_LICENSE("GPL v2");
344 
345 module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
346 module_exit(crc32_mod_exit);
347 

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