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1da177e4 LT |
1 | /* |
2 | * Cryptographic API. | |
3 | * | |
4 | * Cipher operations. | |
5 | * | |
6 | * Copyright (c) 2002 James Morris <jmorris@intercode.com.au> | |
7 | * 2002 Adam J. Richter <adam@yggdrasil.com> | |
8 | * 2004 Jean-Luc Cooke <jlcooke@certainkey.com> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | */ | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/mm.h> | |
5c64097a | 18 | #include <linux/module.h> |
1da177e4 LT |
19 | #include <linux/pagemap.h> |
20 | #include <linux/highmem.h> | |
5c64097a HX |
21 | #include <linux/scatterlist.h> |
22 | ||
1da177e4 LT |
23 | #include "internal.h" |
24 | #include "scatterwalk.h" | |
25 | ||
26 | enum km_type crypto_km_types[] = { | |
27 | KM_USER0, | |
28 | KM_USER1, | |
29 | KM_SOFTIRQ0, | |
30 | KM_SOFTIRQ1, | |
31 | }; | |
5c64097a | 32 | EXPORT_SYMBOL_GPL(crypto_km_types); |
1da177e4 | 33 | |
5c64097a | 34 | static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) |
1da177e4 | 35 | { |
5c64097a HX |
36 | void *src = out ? buf : sgdata; |
37 | void *dst = out ? sgdata : buf; | |
38 | ||
39 | memcpy(dst, src, nbytes); | |
1da177e4 LT |
40 | } |
41 | ||
42 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg) | |
43 | { | |
1da177e4 LT |
44 | walk->sg = sg; |
45 | ||
1da177e4 LT |
46 | BUG_ON(!sg->length); |
47 | ||
1da177e4 LT |
48 | walk->offset = sg->offset; |
49 | } | |
5c64097a | 50 | EXPORT_SYMBOL_GPL(scatterwalk_start); |
1da177e4 | 51 | |
5c64097a | 52 | void *scatterwalk_map(struct scatter_walk *walk, int out) |
1da177e4 | 53 | { |
5c64097a HX |
54 | return crypto_kmap(scatterwalk_page(walk), out) + |
55 | offset_in_page(walk->offset); | |
1da177e4 | 56 | } |
5c64097a | 57 | EXPORT_SYMBOL_GPL(scatterwalk_map); |
1da177e4 LT |
58 | |
59 | static void scatterwalk_pagedone(struct scatter_walk *walk, int out, | |
60 | unsigned int more) | |
61 | { | |
62 | if (out) | |
5c64097a | 63 | flush_dcache_page(scatterwalk_page(walk)); |
1da177e4 LT |
64 | |
65 | if (more) { | |
5c64097a HX |
66 | walk->offset += PAGE_SIZE - 1; |
67 | walk->offset &= PAGE_MASK; | |
68 | if (walk->offset >= walk->sg->offset + walk->sg->length) | |
1da177e4 LT |
69 | scatterwalk_start(walk, sg_next(walk->sg)); |
70 | } | |
71 | } | |
72 | ||
73 | void scatterwalk_done(struct scatter_walk *walk, int out, int more) | |
74 | { | |
5c64097a | 75 | if (!offset_in_page(walk->offset) || !more) |
1da177e4 LT |
76 | scatterwalk_pagedone(walk, out, more); |
77 | } | |
5c64097a | 78 | EXPORT_SYMBOL_GPL(scatterwalk_done); |
1da177e4 | 79 | |
5c64097a HX |
80 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
81 | size_t nbytes, int out) | |
1da177e4 | 82 | { |
5c64097a HX |
83 | for (;;) { |
84 | unsigned int len_this_page = scatterwalk_pagelen(walk); | |
85 | u8 *vaddr; | |
86 | ||
87 | if (len_this_page > nbytes) | |
88 | len_this_page = nbytes; | |
89 | ||
90 | vaddr = scatterwalk_map(walk, out); | |
91 | memcpy_dir(buf, vaddr, len_this_page, out); | |
92 | scatterwalk_unmap(vaddr, out); | |
93 | ||
94 | if (nbytes == len_this_page) | |
95 | break; | |
96 | ||
97 | buf += len_this_page; | |
98 | nbytes -= len_this_page; | |
1da177e4 | 99 | |
1da177e4 | 100 | scatterwalk_pagedone(walk, out, 1); |
c774e93e | 101 | } |
1da177e4 | 102 | |
5c64097a | 103 | scatterwalk_advance(walk, nbytes); |
1da177e4 | 104 | } |
5c64097a | 105 | EXPORT_SYMBOL_GPL(scatterwalk_copychunks); |