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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 | #include <linux/sched.h> |
27 | |
28 | static inline void crypto_yield(u32 flags) |
29 | { |
30 | if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) |
31 | cond_resched(); |
32 | } |
33 | |
34 | static inline void scatterwalk_sg_chain(struct scatterlist *sg1, int num, |
35 | struct scatterlist *sg2) |
36 | { |
37 | sg_set_page(&sg1[num - 1], (void *)sg2, 0, 0); |
38 | sg1[num - 1].page_link &= ~0x02; |
39 | } |
40 | |
41 | static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg) |
42 | { |
43 | if (sg_is_last(sg)) |
44 | return NULL; |
45 | |
46 | return (++sg)->length ? sg : (void *)sg_page(sg); |
47 | } |
48 | |
49 | static inline void scatterwalk_crypto_chain(struct scatterlist *head, |
50 | struct scatterlist *sg, |
51 | int chain, int num) |
52 | { |
53 | if (chain) { |
54 | head->length += sg->length; |
55 | sg = scatterwalk_sg_next(sg); |
56 | } |
57 | |
58 | if (sg) |
59 | scatterwalk_sg_chain(head, num, sg); |
60 | else |
61 | sg_mark_end(head); |
62 | } |
63 | |
64 | static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, |
65 | struct scatter_walk *walk_out) |
66 | { |
67 | return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) + |
68 | (int)(walk_in->offset - walk_out->offset)); |
69 | } |
70 | |
71 | static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) |
72 | { |
73 | unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; |
74 | unsigned int len_this_page = offset_in_page(~walk->offset) + 1; |
75 | return len_this_page > len ? len : len_this_page; |
76 | } |
77 | |
78 | static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, |
79 | unsigned int nbytes) |
80 | { |
81 | unsigned int len_this_page = scatterwalk_pagelen(walk); |
82 | return nbytes > len_this_page ? len_this_page : nbytes; |
83 | } |
84 | |
85 | static inline void scatterwalk_advance(struct scatter_walk *walk, |
86 | unsigned int nbytes) |
87 | { |
88 | walk->offset += nbytes; |
89 | } |
90 | |
91 | static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, |
92 | unsigned int alignmask) |
93 | { |
94 | return !(walk->offset & alignmask); |
95 | } |
96 | |
97 | static inline struct page *scatterwalk_page(struct scatter_walk *walk) |
98 | { |
99 | return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); |
100 | } |
101 | |
102 | static inline void scatterwalk_unmap(void *vaddr) |
103 | { |
104 | kunmap_atomic(vaddr); |
105 | } |
106 | |
107 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); |
108 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
109 | size_t nbytes, int out); |
110 | void *scatterwalk_map(struct scatter_walk *walk); |
111 | void scatterwalk_done(struct scatter_walk *walk, int out, int more); |
112 | |
113 | void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, |
114 | unsigned int start, unsigned int nbytes, int out); |
115 | |
116 | int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes); |
117 | |
118 | #endif /* _CRYPTO_SCATTERWALK_H */ |
119 |
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