blob: 23e09efd2aa61dbbb245086ca90e6f7e89215ded (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Shared glue code for 128bit block ciphers
*/
#ifndef _CRYPTO_GLUE_HELPER_H
#define _CRYPTO_GLUE_HELPER_H
#include <crypto/internal/skcipher.h>
#include <linux/kernel.h>
#include <asm/fpu/api.h>
typedef void (*common_glue_func_t)(const void *ctx, u8 *dst, const u8 *src);
typedef void (*common_glue_cbc_func_t)(const void *ctx, u8 *dst, const u8 *src);
struct common_glue_func_entry {
unsigned int num_blocks; /* number of blocks that @fn will process */
union {
common_glue_func_t ecb;
common_glue_cbc_func_t cbc;
} fn_u;
};
struct common_glue_ctx {
unsigned int num_funcs;
int fpu_blocks_limit; /* -1 means fpu not needed at all */
/*
* First funcs entry must have largest num_blocks and last funcs entry
* must have num_blocks == 1!
*/
struct common_glue_func_entry funcs[];
};
static inline bool glue_fpu_begin(unsigned int bsize, int fpu_blocks_limit,
struct skcipher_walk *walk,
bool fpu_enabled, unsigned int nbytes)
{
if (likely(fpu_blocks_limit < 0))
return false;
if (fpu_enabled)
return true;
/*
* Vector-registers are only used when chunk to be processed is large
* enough, so do not enable FPU until it is necessary.
*/
if (nbytes < bsize * (unsigned int)fpu_blocks_limit)
return false;
/* prevent sleeping if FPU is in use */
skcipher_walk_atomise(walk);
kernel_fpu_begin();
return true;
}
static inline void glue_fpu_end(bool fpu_enabled)
{
if (fpu_enabled)
kernel_fpu_end();
}
extern int glue_ecb_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
extern int glue_cbc_encrypt_req_128bit(const common_glue_func_t fn,
struct skcipher_request *req);
extern int glue_cbc_decrypt_req_128bit(const struct common_glue_ctx *gctx,
struct skcipher_request *req);
#endif /* _CRYPTO_GLUE_HELPER_H */
|