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Linux/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 <crypto/algapi.h>
 20 #include <linux/highmem.h>
 21 #include <linux/kernel.h>
 22 #include <linux/scatterlist.h>
 23 
 24 static inline void scatterwalk_crypto_chain(struct scatterlist *head,
 25                                             struct scatterlist *sg, int num)
 26 {
 27         if (sg)
 28                 sg_chain(head, num, sg);
 29         else
 30                 sg_mark_end(head);
 31 }
 32 
 33 static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
 34 {
 35         unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
 36         unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
 37         return len_this_page > len ? len : len_this_page;
 38 }
 39 
 40 static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
 41                                              unsigned int nbytes)
 42 {
 43         unsigned int len_this_page = scatterwalk_pagelen(walk);
 44         return nbytes > len_this_page ? len_this_page : nbytes;
 45 }
 46 
 47 static inline void scatterwalk_advance(struct scatter_walk *walk,
 48                                        unsigned int nbytes)
 49 {
 50         walk->offset += nbytes;
 51 }
 52 
 53 static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
 54                                                unsigned int alignmask)
 55 {
 56         return !(walk->offset & alignmask);
 57 }
 58 
 59 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
 60 {
 61         return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
 62 }
 63 
 64 static inline void scatterwalk_unmap(void *vaddr)
 65 {
 66         kunmap_atomic(vaddr);
 67 }
 68 
 69 static inline void scatterwalk_start(struct scatter_walk *walk,
 70                                      struct scatterlist *sg)
 71 {
 72         walk->sg = sg;
 73         walk->offset = sg->offset;
 74 }
 75 
 76 static inline void *scatterwalk_map(struct scatter_walk *walk)
 77 {
 78         return kmap_atomic(scatterwalk_page(walk)) +
 79                offset_in_page(walk->offset);
 80 }
 81 
 82 static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
 83                                         unsigned int more)
 84 {
 85         if (out) {
 86                 struct page *page;
 87 
 88                 page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
 89                 /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
 90                  * PageSlab cannot be optimised away per se due to
 91                  * use of volatile pointer.
 92                  */
 93                 if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
 94                         flush_dcache_page(page);
 95         }
 96 
 97         if (more && walk->offset >= walk->sg->offset + walk->sg->length)
 98                 scatterwalk_start(walk, sg_next(walk->sg));
 99 }
100 
101 static inline void scatterwalk_done(struct scatter_walk *walk, int out,
102                                     int more)
103 {
104         if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
105             !(walk->offset & (PAGE_SIZE - 1)))
106                 scatterwalk_pagedone(walk, out, more);
107 }
108 
109 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
110                             size_t nbytes, int out);
111 void *scatterwalk_map(struct scatter_walk *walk);
112 
113 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
114                               unsigned int start, unsigned int nbytes, int out);
115 
116 struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
117                                      struct scatterlist *src,
118                                      unsigned int len);
119 
120 #endif  /* _CRYPTO_SCATTERWALK_H */
121 

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