00
#
d ſ
Index of /FSS-OZR/root/sys/dev/char/5:1/subsystem/tty1/power
Index of /FSS-OZR/root/sys/dev/char/5:1/subsystem/tty1/power
#/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Cryptographic scatter and gather helpers.
*
* Copyright (c) 2002 James Morris
* Copyright (c) 2002 Adam J. Richter
* Copyright (c) 2004 Jean-Luc Cooke
* Copyright (c) 2007 Herbert Xu
*/
#ifndef _CRYPTO_SCATTERWALK_H
#define _CRYPTO_SCATTERWALK_H
#include
#include
#include
#include
static inline void scatterwalk_crypto_chain(struct scatterlist *head,
struct scatterlist *sg, int num)
{
if (sg)
sg_chain(head, num, sg);
else
sg_mark_end(head);
}
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);
}
static inline void scatterwalk_start(struct scatter_walk *walk,
struct scatterlist *sg)
{
walk->sg = sg;
walk->offset = sg->offset;
}
static inline void *scatterwalk_map(struct scatter_walk *walk)
{
return kmap_atomic(scatterwalk_page(walk)) +
offset_in_page(walk->offset);
}
static inline void scatterwalk_pagedone(struct scatter_walk *walk, int out,
unsigned int more)
{
if (out) {
struct page *page;
page = sg_page(walk->sg) + ((walk->offset - 1) >> PAGE_SHIFT);
flush_dcache_page(page);
}
if (more && walk->offset >= walk->sg->offset + walk->sg->length)
scatterwalk_start(walk, sg_next(walk->sg));
}
static inline voi