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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,
 26                                             int chain, int num)
 27 {
 28         if (chain) {
 29                 head->length += sg->length;
 30                 sg = sg_next(sg);
 31         }
 32 
 33         if (sg)
 34                 sg_chain(head, num, sg);
 35         else
 36                 sg_mark_end(head);
 37 }
 38 
 39 static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
 40                                                 struct scatter_walk *walk_out)
 41 {
 42         return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) +
 43                  (int)(walk_in->offset - walk_out->offset));
 44 }
 45 
 46 static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
 47 {
 48         unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
 49         unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
 50         return len_this_page > len ? len : len_this_page;
 51 }
 52 
 53 static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
 54                                              unsigned int nbytes)
 55 {
 56         unsigned int len_this_page = scatterwalk_pagelen(walk);
 57         return nbytes > len_this_page ? len_this_page : nbytes;
 58 }
 59 
 60 static inline void scatterwalk_advance(struct scatter_walk *walk,
 61                                        unsigned int nbytes)
 62 {
 63         walk->offset += nbytes;
 64 }
 65 
 66 static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
 67                                                unsigned int alignmask)
 68 {
 69         return !(walk->offset & alignmask);
 70 }
 71 
 72 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
 73 {
 74         return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
 75 }
 76 
 77 static inline void scatterwalk_unmap(void *vaddr)
 78 {
 79         kunmap_atomic(vaddr);
 80 }
 81 
 82 static inline void scatterwalk_start(struct scatter_walk *walk,
 83                                      struct scatterlist *sg)
 84 {
 85         walk->sg = sg;
 86         walk->offset = sg->offset;
 87 }
 88 
 89 static inline void *scatterwalk_map(struct scatter_walk *walk)
 90 {
 91         return kmap_atomic(scatterwalk_page(walk)) +
 92                offset_in_page(walk->offset);
 93 }
 94 
 95 static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
 96                                         unsigned int more)
 97 {
 98         if (out) {
 99                 struct page *page;
100 
101                 page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
102                 /* Test ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE first as
103                  * PageSlab cannot be optimised away per se due to
104                  * use of volatile pointer.
105                  */
106                 if (ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE && !PageSlab(page))
107                         flush_dcache_page(page);
108         }
109 
110         if (more && walk->offset >= walk->sg->offset + walk->sg->length)
111                 scatterwalk_start(walk, sg_next(walk->sg));
112 }
113 
114 static inline void scatterwalk_done(struct scatter_walk *walk, int out,
115                                     int more)
116 {
117         if (!more || walk->offset >= walk->sg->offset + walk->sg->length ||
118             !(walk->offset & (PAGE_SIZE - 1)))
119                 scatterwalk_pagedone(walk, out, more);
120 }
121 
122 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
123                             size_t nbytes, int out);
124 void *scatterwalk_map(struct scatter_walk *walk);
125 
126 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
127                               unsigned int start, unsigned int nbytes, int out);
128 
129 struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
130                                      struct scatterlist *src,
131                                      unsigned int len);
132 
133 #endif  /* _CRYPTO_SCATTERWALK_H */
134 

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