You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.9 KiB
101 lines
2.9 KiB
/* |
|
* Cryptographic scatter and gather helpers. |
|
* |
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.au> |
|
* Copyright (c) 2002 Adam J. Richter <adam@yggdrasil.com> |
|
* Copyright (c) 2004 Jean-Luc Cooke <jlcooke@certainkey.com> |
|
* Copyright (c) 2007 Herbert Xu <herbert@gondor.apana.org.au> |
|
* |
|
* This program is free software; you can redistribute it and/or modify it |
|
* under the terms of the GNU General Public License as published by the Free |
|
* Software Foundation; either version 2 of the License, or (at your option) |
|
* any later version. |
|
* |
|
*/ |
|
|
|
#ifndef _CRYPTO_SCATTERWALK_H |
|
#define _CRYPTO_SCATTERWALK_H |
|
|
|
#include <asm/kmap_types.h> |
|
#include <crypto/algapi.h> |
|
#include <linux/hardirq.h> |
|
#include <linux/highmem.h> |
|
#include <linux/kernel.h> |
|
#include <linux/mm.h> |
|
#include <linux/scatterlist.h> |
|
#include <linux/sched.h> |
|
|
|
static inline void scatterwalk_crypto_chain(struct scatterlist *head, |
|
struct scatterlist *sg, |
|
int chain, int num) |
|
{ |
|
if (chain) { |
|
head->length += sg->length; |
|
sg = sg_next(sg); |
|
} |
|
|
|
if (sg) |
|
sg_chain(head, num, sg); |
|
else |
|
sg_mark_end(head); |
|
} |
|
|
|
static inline unsigned long scatterwalk_samebuf(struct scatter_walk *walk_in, |
|
struct scatter_walk *walk_out) |
|
{ |
|
return !(((sg_page(walk_in->sg) - sg_page(walk_out->sg)) << PAGE_SHIFT) + |
|
(int)(walk_in->offset - walk_out->offset)); |
|
} |
|
|
|
static inline unsigned int scatterwalk_pagelen(struct scatter_walk *walk) |
|
{ |
|
unsigned int len = walk->sg->offset + walk->sg->length - walk->offset; |
|
unsigned int len_this_page = offset_in_page(~walk->offset) + 1; |
|
return len_this_page > len ? len : len_this_page; |
|
} |
|
|
|
static inline unsigned int scatterwalk_clamp(struct scatter_walk *walk, |
|
unsigned int nbytes) |
|
{ |
|
unsigned int len_this_page = scatterwalk_pagelen(walk); |
|
return nbytes > len_this_page ? len_this_page : nbytes; |
|
} |
|
|
|
static inline void scatterwalk_advance(struct scatter_walk *walk, |
|
unsigned int nbytes) |
|
{ |
|
walk->offset += nbytes; |
|
} |
|
|
|
static inline unsigned int scatterwalk_aligned(struct scatter_walk *walk, |
|
unsigned int alignmask) |
|
{ |
|
return !(walk->offset & alignmask); |
|
} |
|
|
|
static inline struct page *scatterwalk_page(struct scatter_walk *walk) |
|
{ |
|
return sg_page(walk->sg) + (walk->offset >> PAGE_SHIFT); |
|
} |
|
|
|
static inline void scatterwalk_unmap(void *vaddr) |
|
{ |
|
kunmap_atomic(vaddr); |
|
} |
|
|
|
void scatterwalk_start(struct scatter_walk *walk, struct scatterlist *sg); |
|
void scatterwalk_copychunks(void *buf, struct scatter_walk *walk, |
|
size_t nbytes, int out); |
|
void *scatterwalk_map(struct scatter_walk *walk); |
|
void scatterwalk_done(struct scatter_walk *walk, int out, int more); |
|
|
|
void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg, |
|
unsigned int start, unsigned int nbytes, int out); |
|
|
|
int scatterwalk_bytes_sglen(struct scatterlist *sg, int num_bytes); |
|
|
|
struct scatterlist *scatterwalk_ffwd(struct scatterlist dst[2], |
|
struct scatterlist *src, |
|
unsigned int len); |
|
|
|
#endif /* _CRYPTO_SCATTERWALK_H */
|
|
|