From 7996a3d79d55b7f879dfd62e202bbfe2963718d3 Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Sat, 27 Jul 2013 22:15:01 +0000 Subject: really properly move files --- .../contrib/include/crypto/scatterwalk.h | 123 +++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 libdde-linux26/contrib/include/crypto/scatterwalk.h (limited to 'libdde-linux26/contrib/include/crypto/scatterwalk.h') diff --git a/libdde-linux26/contrib/include/crypto/scatterwalk.h b/libdde-linux26/contrib/include/crypto/scatterwalk.h new file mode 100644 index 00000000..833d208c --- /dev/null +++ b/libdde-linux26/contrib/include/crypto/scatterwalk.h @@ -0,0 +1,123 @@ +/* + * 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 + * + * 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 +#include +#include +#include +#include +#include +#include +#include + +static inline enum km_type crypto_kmap_type(int out) +{ + enum km_type type; + + if (in_softirq()) + type = out * (KM_SOFTIRQ1 - KM_SOFTIRQ0) + KM_SOFTIRQ0; + else + type = out * (KM_USER1 - KM_USER0) + KM_USER0; + + return type; +} + +static inline void *crypto_kmap(struct page *page, int out) +{ + return kmap_atomic(page, crypto_kmap_type(out)); +} + +static inline void crypto_kunmap(void *vaddr, int out) +{ + kunmap_atomic(vaddr, crypto_kmap_type(out)); +} + +static inline void crypto_yield(u32 flags) +{ + if (flags & CRYPTO_TFM_REQ_MAY_SLEEP) + cond_resched(); +} + +static inline void scatterwalk_sg_chain(struct scatterlist *sg1, int num, + struct scatterlist *sg2) +{ + sg_set_page(&sg1[num - 1], (void *)sg2, 0, 0); + sg1[num - 1].page_link &= ~0x02; +} + +static inline struct scatterlist *scatterwalk_sg_next(struct scatterlist *sg) +{ + if (sg_is_last(sg)) + return NULL; + + return (++sg)->length ? sg : (void *)sg_page(sg); +} + +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, int out) +{ + crypto_kunmap(vaddr, out); +} + +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, int out); +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); + +#endif /* _CRYPTO_SCATTERWALK_H */ -- cgit v1.2.3