diff options
Diffstat (limited to 'include/crypto')
-rw-r--r-- | include/crypto/scatterwalk.h | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h new file mode 100644 index 000000000000..07b6f17122d2 --- /dev/null +++ b/include/crypto/scatterwalk.h | |||
@@ -0,0 +1,107 @@ | |||
1 | /* | ||
2 | * Cryptographic scatter and gather helpers. | ||
3 | * | ||
4 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | ||
5 | * Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com> | ||
6 | * Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com> | ||
7 | * Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> | ||
8 | * | ||
9 | * This program is free software; you can redistribute it and/or modify it | ||
10 | * under the terms of the GNU General Public License as published by the Free | ||
11 | * Software Foundation; either version 2 of the License, or (at your option) | ||
12 | * any later version. | ||
13 | * | ||
14 | */ | ||
15 | |||
16 | #ifndef _CRYPTO_SCATTERWALK_H | ||
17 | #define _CRYPTO_SCATTERWALK_H | ||
18 | |||
19 | #include <asm/kmap_types.h> | ||
20 | #include <crypto/algapi.h> | ||
21 | #include <linux/hardirq.h> | ||
22 | #include <linux/highmem.h> | ||
23 | #include <linux/kernel.h> | ||
24 | #include <linux/mm.h> | ||
25 | #include <linux/scatterlist.h> | ||
26 | |||
27 | static inline enum km_type crypto_kmap_type(int out) | ||
28 | { | ||
29 | enum km_type type; | ||
30 | |||
31 | if (in_softirq()) | ||
32 | type = out * (KM_SOFTIRQ1 - KM_SOFTIRQ0) + KM_SOFTIRQ0; | ||
33 | else | ||
34 | type = out * (KM_USER1 - KM_USER0) + KM_USER0; | ||
35 | |||
36 | return type; | ||
37 | } | ||
38 | |||
39 | static inline void *crypto_kmap(struct page *page, int out) | ||
40 | { | ||
41 | return kmap_atomic(page, crypto_kmap_type(out)); | ||
42 | } | ||
43 | |||
44 | static inline void crypto_kunmap(void *vaddr, int out) | ||
45 | { | ||
46 | kunmap_atomic(vaddr, crypto_kmap_type(out)); | ||
47 | } | ||
48 | |||
49 | static inline void crypto_yield(u32 flags) | ||
50 | { | ||
51 | if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) | ||
52 | cond_resched(); | ||
53 | } | ||
54 | |||
55 | static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, | ||
56 | struct scatter_walk *walk_out) | ||
57 | { | ||
58 | return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) + | ||
59 | (int)(walk_in->offset - walk_out->offset)); | ||
60 | } | ||
61 | |||
62 | static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) | ||
63 | { | ||
64 | unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; | ||
65 | unsigned int len_this_page = offset_in_page(~walk->offset) + 1; | ||
66 | return len_this_page > len ? len : len_this_page; | ||
67 | } | ||
68 | |||
69 | static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, | ||
70 | unsigned int nbytes) | ||
71 | { | ||
72 | unsigned int len_this_page = scatterwalk_pagelen(walk); | ||
73 | return nbytes > len_this_page ? len_this_page : nbytes; | ||
74 | } | ||
75 | |||
76 | static inline void scatterwalk_advance(struct scatter_walk *walk, | ||
77 | unsigned int nbytes) | ||
78 | { | ||
79 | walk->offset += nbytes; | ||
80 | } | ||
81 | |||
82 | static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, | ||
83 | unsigned int alignmask) | ||
84 | { | ||
85 | return !(walk->offset & alignmask); | ||
86 | } | ||
87 | |||
88 | static inline struct page *scatterwalk_page(struct scatter_walk *walk) | ||
89 | { | ||
90 | return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); | ||
91 | } | ||
92 | |||
93 | static inline void scatterwalk_unmap(void *vaddr, int out) | ||
94 | { | ||
95 | crypto_kunmap(vaddr, out); | ||
96 | } | ||
97 | |||
98 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); | ||
99 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, | ||
100 | size_t nbytes, int out); | ||
101 | void *scatterwalk_map(struct scatter_walk *walk, int out); | ||
102 | void scatterwalk_done(struct scatter_walk *walk, int out, int more); | ||
103 | |||
104 | void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, | ||
105 | unsigned int start, unsigned int nbytes, int out); | ||
106 | |||
107 | #endif /* _CRYPTO_SCATTERWALK_H */ | ||