~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/include/crypto/scatterwalk.h

Version: ~ [ linux-5.10-rc1 ] ~ [ linux-5.9.1 ] ~ [ linux-5.8.16 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.72 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.152 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.202 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.240 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.240 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 <asm/kmap_types.h>
 20 #include <crypto/algapi.h>
 21 #include <linux/hardirq.h>
 22 #include <linux/highmem.h>
 23 #include <linux/kernel.h>
 24 #include <linux/mm.h>
 25 #include <linux/scatterlist.h>
 26 #include <linux/sched.h>
 27 
 28 static inline void scatterwalk_crypto_chain(struct scatterlist *head,
 29                                             struct scatterlist *sg,
 30                                             int chain, int num)
 31 {
 32         if (chain) {
 33                 head->length += sg->length;
 34                 sg = sg_next(sg);
 35         }
 36 
 37         if (sg)
 38                 sg_chain(head, num, sg);
 39         else
 40                 sg_mark_end(head);
 41 }
 42 
 43 static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in,
 44                                                 struct scatter_walk *walk_out)
 45 {
 46         return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) +
 47                  (int)(walk_in->offset - walk_out->offset));
 48 }
 49 
 50 static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk)
 51 {
 52         unsigned int len = walk->sg->offset + walk->sg->length - walk->offset;
 53         unsigned int len_this_page = offset_in_page(~walk->offset) + 1;
 54         return len_this_page > len ? len : len_this_page;
 55 }
 56 
 57 static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk,
 58                                              unsigned int nbytes)
 59 {
 60         unsigned int len_this_page = scatterwalk_pagelen(walk);
 61         return nbytes > len_this_page ? len_this_page : nbytes;
 62 }
 63 
 64 static inline void scatterwalk_advance(struct scatter_walk *walk,
 65                                        unsigned int nbytes)
 66 {
 67         walk->offset += nbytes;
 68 }
 69 
 70 static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk,
 71                                                unsigned int alignmask)
 72 {
 73         return !(walk->offset & alignmask);
 74 }
 75 
 76 static inline struct page *scatterwalk_page(struct scatter_walk *walk)
 77 {
 78         return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT);
 79 }
 80 
 81 static inline void scatterwalk_unmap(void *vaddr)
 82 {
 83         kunmap_atomic(vaddr);
 84 }
 85 
 86 void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg);
 87 void scatterwalk_copychunks(void *buf, struct scatter_walk *walk,
 88                             size_t nbytes, int out);
 89 void *scatterwalk_map(struct scatter_walk *walk);
 90 void scatterwalk_done(struct scatter_walk *walk, int out, int more);
 91 
 92 void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
 93                               unsigned int start, unsigned int nbytes, int out);
 94 
 95 int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes);
 96 
 97 struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2],
 98                                      struct scatterlist *src,
 99                                      unsigned int len);
100 
101 #endif  /* _CRYPTO_SCATTERWALK_H */
102 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp