scatterwalk.h

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    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 
   18 #include <linux/mm.h>
   19 #include <linux/scatterlist.h>
   20 
   21 #include "internal.h"
   22 
   23 static inline struct scatterlist *sg_next(struct scatterlist *sg)
   24 {
   25         return (++sg)->length ? sg : (void *)sg->page;
   26 }
   27 
   28 static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
   29                                                 struct scatter_walk *walk_out)
   30 {
   31         return !(((walk_in->sg->page - walk_out->sg->page) << PAGE_SHIFT) +
   32                  (int)(walk_in->offset - walk_out->offset));
   33 }
   34 
   35 static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
   36 {
   37         unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
   38         unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
   39         return len_this_page > len ? len : len_this_page;
   40 }
   41 
   42 static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
   43                                              unsigned int nbytes)
   44 {
   45         unsigned int len_this_page = scatterwalk_pagelen(walk);
   46         return nbytes > len_this_page ? len_this_page : nbytes;
   47 }
   48 
   49 static inline void scatterwalk_advance(struct scatter_walk *walk,
   50                                        unsigned int nbytes)
   51 {
   52         walk->offset += nbytes;
   53 }
   54 
   55 static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
   56                                                unsigned int alignmask)
   57 {
   58         return !(walk->offset & alignmask);
   59 }
   60 
   61 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
   62 {
   63         return walk->sg->page + (walk->offset >> PAGE_SHIFT);
   64 }
   65 
   66 static inline void scatterwalk_unmap(void *vaddr, int out)
   67 {
   68         crypto_kunmap(vaddr, out);
   69 }
   70 
   71 void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
   72 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
   73                             size_t nbytes, int out);
   74 void *scatterwalk_map(struct scatter_walk *walk, int out);
   75 void scatterwalk_done(struct scatter_walk *walk, int out, int more);
   76 
   77 #endif  /* _CRYPTO_SCATTERWALK_H */

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FreeBSD/Linux Kernel Cross Reference sys/crypto/scatterwalk.h

FreeBSD/Linux Kernel Cross Reference
sys/crypto/scatterwalk.h