| | 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> |
| | 18 | #include <linux/module.h> |
| | 19 | #include <linux/pagemap.h> |
| | 20 | #include <linux/highmem.h> |
| | 21 | #include <linux/scatterlist.h> |
| | 22 | |
| | 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 | }; |
| | 32 | EXPORT_SYMBOL_GPL(crypto_km_types); |
| | 33 | |
| | 34 | static inline void memcpy_dir(void *buf, void *sgdata, size_t nbytes, int out) |
| | 35 | { |
| | 36 | void *src = out ? buf : sgdata; |
| | 37 | void *dst = out ? sgdata : buf; |
| | 38 | |
| | 39 | memcpy(dst, src, nbytes); |
| | 40 | } |
| | 41 | |
| | 42 | void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg) |
| | 43 | { |
| | 44 | walk->sg = sg; |
| | 45 | |
| | 46 | BUG_ON(!sg->length); |
| | 47 | |
| | 48 | walk->offset = sg->offset; |
| | 49 | } |
| | 50 | EXPORT_SYMBOL_GPL(scatterwalk_start); |
| | 51 | |
| | 52 | void *scatterwalk_map(struct scatter_walk *walk, int out) |
| | 53 | { |
| | 54 | return crypto_kmap(scatterwalk_page(walk), out) + |
| | 55 | offset_in_page(walk->offset); |
| | 56 | } |
| | 57 | EXPORT_SYMBOL_GPL(scatterwalk_map); |
| | 58 | |
| | 59 | static void scatterwalk_pagedone(struct scatter_walk *walk, int out, |
| | 60 | unsigned int more) |
| | 61 | { |
| | 62 | if (out) { |
| | 63 | struct page *page; |
| | 64 | |
| | 65 | page = walk->sg->page + ((walk->offset - 1) >> PAGE_SHIFT); |
| | 66 | flush_dcache_page(page); |
| | 67 | } |
| | 68 | |
| | 69 | if (more) { |
| | 70 | walk->offset += PAGE_SIZE - 1; |
| | 71 | walk->offset &= PAGE_MASK; |
| | 72 | if (walk->offset >= walk->sg->offset + walk->sg->length) |
| | 73 | scatterwalk_start(walk, sg_next(walk->sg)); |
| | 74 | } |
| | 75 | } |
| | 76 | |
| | 77 | void scatterwalk_done(struct scatter_walk *walk, int out, int more) |
| | 78 | { |
| | 79 | if (!offset_in_page(walk->offset) || !more) |
| | 80 | scatterwalk_pagedone(walk, out, more); |
| | 81 | } |
| | 82 | EXPORT_SYMBOL_GPL(scatterwalk_done); |
| | 83 | |
| | 84 | void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
| | 85 | size_t nbytes, int out) |
| | 86 | { |
| | 87 | for (;;) { |
| | 88 | unsigned int len_this_page = scatterwalk_pagelen(walk); |
| | 89 | u8 *vaddr; |
| | 90 | |
| | 91 | if (len_this_page > nbytes) |
| | 92 | len_this_page = nbytes; |
| | 93 | |
| | 94 | vaddr = scatterwalk_map(walk, out); |
| | 95 | memcpy_dir(buf, vaddr, len_this_page, out); |
| | 96 | scatterwalk_unmap(vaddr, out); |
| | 97 | |
| | 98 | scatterwalk_advance(walk, len_this_page); |
| | 99 | |
| | 100 | if (nbytes == len_this_page) |
| | 101 | break; |
| | 102 | |
| | 103 | buf += len_this_page; |
| | 104 | nbytes -= len_this_page; |
| | 105 | |
| | 106 | scatterwalk_pagedone(walk, out, 1); |
| | 107 | } |
| | 108 | } |
| | 109 | EXPORT_SYMBOL_GPL(scatterwalk_copychunks); |
projects / mirror_ubuntu-zesty-kernel.git / blame_incremental