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-rw-r--r--include/crypto/scatterwalk.h107
1 files changed, 107 insertions, 0 deletions
diff --git a/include/crypto/scatterwalk.h b/include/crypto/scatterwalk.h
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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
27static 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
39static inline void *crypto_kmap(struct page *page, int out)
40{
41 return kmap_atomic(page, crypto_kmap_type(out));
42}
43
44static inline void crypto_kunmap(void *vaddr, int out)
45{
46 kunmap_atomic(vaddr, crypto_kmap_type(out));
47}
48
49static inline void crypto_yield(u32 flags)
50{
51 if (flags & CRYPTO_TFM_REQ_MAY_SLEEP)
52 cond_resched();
53}
54
55static 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
62static 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
69static 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
76static inline void scatterwalk_advance(struct scatter_walk *walk,
77 unsigned int nbytes)
78{
79 walk->offset += nbytes;
80}
81
82static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
83 unsigned int alignmask)
84{
85 return !(walk->offset & alignmask);
86}
87
88static inline struct page *scatterwalk_page(struct scatter_walk *walk)
89{
90 return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
91}
92
93static inline void scatterwalk_unmap(void *vaddr, int out)
94{
95 crypto_kunmap(vaddr, out);
96}
97
98void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
99void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
100 size_t nbytes, int out);
101void *scatterwalk_map(struct scatter_walk *walk, int out);
102void scatterwalk_done(struct scatter_walk *walk, int out, int more);
103
104void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
105 unsigned int start, unsigned int nbytes, int out);
106
107#endif /* _CRYPTO_SCATTERWALK_H */