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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
21enum crc_op_size {
22 b, h, w, d,
23};
24
25enum 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
50#define _ASM_SET_CRC ".set\tcrc\n\t"
51#endif
52
53#define _CRC32(crc, value, size, type) \
54do { \
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
70static 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
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
110static 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
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
152struct chksum_ctx {
153 u32 key;
154};
155
156struct chksum_desc_ctx {
157 u32 crc;
158};
159
160static 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
172
173
174
175static 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 crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
182 return -EINVAL;
183 }
184 mctx->key = get_unaligned_le32(key);
185 return 0;
186}
187
188static int chksum_update(struct shash_desc *desc, const u8 *data,
189 unsigned int length)
190{
191 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
192
193 ctx->crc = crc32_mips_le_hw(ctx->crc, data, length);
194 return 0;
195}
196
197static int chksumc_update(struct shash_desc *desc, const u8 *data,
198 unsigned int length)
199{
200 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
201
202 ctx->crc = crc32c_mips_le_hw(ctx->crc, data, length);
203 return 0;
204}
205
206static int chksum_final(struct shash_desc *desc, u8 *out)
207{
208 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
209
210 put_unaligned_le32(ctx->crc, out);
211 return 0;
212}
213
214static int chksumc_final(struct shash_desc *desc, u8 *out)
215{
216 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
217
218 put_unaligned_le32(~ctx->crc, out);
219 return 0;
220}
221
222static int __chksum_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
223{
224 put_unaligned_le32(crc32_mips_le_hw(crc, data, len), out);
225 return 0;
226}
227
228static int __chksumc_finup(u32 crc, const u8 *data, unsigned int len, u8 *out)
229{
230 put_unaligned_le32(~crc32c_mips_le_hw(crc, data, len), out);
231 return 0;
232}
233
234static int chksum_finup(struct shash_desc *desc, const u8 *data,
235 unsigned int len, u8 *out)
236{
237 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
238
239 return __chksum_finup(ctx->crc, data, len, out);
240}
241
242static int chksumc_finup(struct shash_desc *desc, const u8 *data,
243 unsigned int len, u8 *out)
244{
245 struct chksum_desc_ctx *ctx = shash_desc_ctx(desc);
246
247 return __chksumc_finup(ctx->crc, data, len, out);
248}
249
250static int chksum_digest(struct shash_desc *desc, const u8 *data,
251 unsigned int length, u8 *out)
252{
253 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
254
255 return __chksum_finup(mctx->key, data, length, out);
256}
257
258static int chksumc_digest(struct shash_desc *desc, const u8 *data,
259 unsigned int length, u8 *out)
260{
261 struct chksum_ctx *mctx = crypto_shash_ctx(desc->tfm);
262
263 return __chksumc_finup(mctx->key, data, length, out);
264}
265
266static int chksum_cra_init(struct crypto_tfm *tfm)
267{
268 struct chksum_ctx *mctx = crypto_tfm_ctx(tfm);
269
270 mctx->key = ~0;
271 return 0;
272}
273
274static struct shash_alg crc32_alg = {
275 .digestsize = CHKSUM_DIGEST_SIZE,
276 .setkey = chksum_setkey,
277 .init = chksum_init,
278 .update = chksum_update,
279 .final = chksum_final,
280 .finup = chksum_finup,
281 .digest = chksum_digest,
282 .descsize = sizeof(struct chksum_desc_ctx),
283 .base = {
284 .cra_name = "crc32",
285 .cra_driver_name = "crc32-mips-hw",
286 .cra_priority = 300,
287 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
288 .cra_blocksize = CHKSUM_BLOCK_SIZE,
289 .cra_alignmask = 0,
290 .cra_ctxsize = sizeof(struct chksum_ctx),
291 .cra_module = THIS_MODULE,
292 .cra_init = chksum_cra_init,
293 }
294};
295
296static struct shash_alg crc32c_alg = {
297 .digestsize = CHKSUM_DIGEST_SIZE,
298 .setkey = chksum_setkey,
299 .init = chksum_init,
300 .update = chksumc_update,
301 .final = chksumc_final,
302 .finup = chksumc_finup,
303 .digest = chksumc_digest,
304 .descsize = sizeof(struct chksum_desc_ctx),
305 .base = {
306 .cra_name = "crc32c",
307 .cra_driver_name = "crc32c-mips-hw",
308 .cra_priority = 300,
309 .cra_flags = CRYPTO_ALG_OPTIONAL_KEY,
310 .cra_blocksize = CHKSUM_BLOCK_SIZE,
311 .cra_alignmask = 0,
312 .cra_ctxsize = sizeof(struct chksum_ctx),
313 .cra_module = THIS_MODULE,
314 .cra_init = chksum_cra_init,
315 }
316};
317
318static int __init crc32_mod_init(void)
319{
320 int err;
321
322 err = crypto_register_shash(&crc32_alg);
323
324 if (err)
325 return err;
326
327 err = crypto_register_shash(&crc32c_alg);
328
329 if (err) {
330 crypto_unregister_shash(&crc32_alg);
331 return err;
332 }
333
334 return 0;
335}
336
337static void __exit crc32_mod_exit(void)
338{
339 crypto_unregister_shash(&crc32_alg);
340 crypto_unregister_shash(&crc32c_alg);
341}
342
343MODULE_AUTHOR("Marcin Nowakowski <marcin.nowakowski@mips.com");
344MODULE_DESCRIPTION("CRC32 and CRC32C using optional MIPS instructions");
345MODULE_LICENSE("GPL v2");
346
347module_cpu_feature_match(MIPS_CRC32, crc32_mod_init);
348module_exit(crc32_mod_exit);
349
