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1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
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 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | */ | |
14 | ||
15 | #ifndef _CRYPTO_SCATTERWALK_H | |
16 | #define _CRYPTO_SCATTERWALK_H | |
5c64097a | 17 | |
1da177e4 | 18 | #include <linux/mm.h> |
5c64097a | 19 | #include <linux/scatterlist.h> |
1da177e4 | 20 | |
5c64097a | 21 | #include "internal.h" |
1da177e4 | 22 | |
ab83407e | 23 | static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg) |
1da177e4 | 24 | { |
055bcee3 | 25 | return (++sg)->length ? sg : (void *)sg->page; |
1da177e4 LT |
26 | } |
27 | ||
5c64097a HX |
28 | static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, |
29 | struct scatter_walk *walk_out) | |
1da177e4 | 30 | { |
5c64097a HX |
31 | return !(((walk_in->sg->page - walk_out->sg->page) << PAGE_SHIFT) + |
32 | (int)(walk_in->offset - walk_out->offset)); | |
33 | } | |
34 | ||
35 | static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) | |
36 | { | |
37 | unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; | |
38 | unsigned int len_this_page = offset_in_page(~walk->offset) + 1; | |
39 | return len_this_page > len ? len : len_this_page; | |
1da177e4 LT |
40 | } |
41 | ||
c774e93e HX |
42 | static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, |
43 | unsigned int nbytes) | |
1da177e4 | 44 | { |
5c64097a HX |
45 | unsigned int len_this_page = scatterwalk_pagelen(walk); |
46 | return nbytes > len_this_page ? len_this_page : nbytes; | |
1da177e4 LT |
47 | } |
48 | ||
49 | static inline void scatterwalk_advance(struct scatter_walk *walk, | |
50 | unsigned int nbytes) | |
51 | { | |
1da177e4 | 52 | walk->offset += nbytes; |
1da177e4 LT |
53 | } |
54 | ||
95477377 HX |
55 | static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, |
56 | unsigned int alignmask) | |
57 | { | |
58 | return !(walk->offset & alignmask); | |
59 | } | |
60 | ||
5c64097a HX |
61 | static inline struct page *scatterwalk_page(struct scatter_walk *walk) |
62 | { | |
63 | return walk->sg->page + (walk->offset >> PAGE_SHIFT); | |
64 | } | |
65 | ||
66 | static inline void scatterwalk_unmap(void *vaddr, int out) | |
67 | { | |
68 | crypto_kunmap(vaddr, out); | |
69 | } | |
70 | ||
1da177e4 | 71 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); |
5c64097a HX |
72 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
73 | size_t nbytes, int out); | |
74 | void *scatterwalk_map(struct scatter_walk *walk, int out); | |
1da177e4 LT |
75 | void scatterwalk_done(struct scatter_walk *walk, int out, int more); |
76 | ||
5fa0fea2 HX |
77 | void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, |
78 | unsigned int start, unsigned int nbytes, int out); | |
79 | ||
1da177e4 | 80 | #endif /* _CRYPTO_SCATTERWALK_H */ |