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ecdfa446 GKH |
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 | |
17 | #include <linux/mm.h> | |
18 | #include <asm/scatterlist.h> | |
19 | ||
20 | struct scatter_walk { | |
21 | struct scatterlist *sg; | |
22 | struct page *page; | |
23 | void *data; | |
24 | unsigned int len_this_page; | |
25 | unsigned int len_this_segment; | |
26 | unsigned int offset; | |
27 | }; | |
28 | ||
29 | /* Define sg_next is an inline routine now in case we want to change | |
30 | scatterlist to a linked list later. */ | |
31 | static inline struct scatterlist *sg_next(struct scatterlist *sg) | |
32 | { | |
33 | return sg + 1; | |
34 | } | |
35 | ||
36 | static inline int scatterwalk_samebuf(struct scatter_walk *walk_in, | |
37 | struct scatter_walk *walk_out, | |
38 | void *src_p, void *dst_p) | |
39 | { | |
40 | return walk_in->page == walk_out->page && | |
41 | walk_in->offset == walk_out->offset && | |
42 | walk_in->data == src_p && walk_out->data == dst_p; | |
43 | } | |
44 | ||
45 | void *scatterwalk_whichbuf(struct scatter_walk *walk, unsigned int nbytes, void *scratch); | |
46 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); | |
47 | int scatterwalk_copychunks(void *buf, struct scatter_walk *walk, size_t nbytes, int out); | |
48 | void scatterwalk_map(struct scatter_walk *walk, int out); | |
49 | void scatterwalk_done(struct scatter_walk *walk, int out, int more); | |
50 | ||
51 | #endif /* _CRYPTO_SCATTERWALK_H */ |