include/crypto/scatterwalk.h

28 	struct scatterlist *sg;
74 					    struct scatterlist *sg, int num)
76 	if (sg)
77 		sg_chain(head, num, sg);
83 				     struct scatterlist *sg)
85 	walk->sg = sg;
86 	walk->offset = sg->offset;
90  * This is equivalent to scatterwalk_start(walk, sg) followed by
94 					    struct scatterlist *sg,
97 	while (pos > sg->length) {
98 		pos -= sg->length;
99 		sg = sg_next(sg);
101 	walk->sg = sg;
102 	walk->offset = sg->offset + pos;
111 	if (walk->offset >= walk->sg->offset + walk->sg->length)
112 		scatterwalk_start(walk, sg_next(walk->sg));
113 	len_this_sg = walk->sg->offset + walk->sg->length - walk->offset;
117 	 * the complexity of having to map multiple pages at once per sg entry,
120 	 * !HIGHMEM case: no mapping is needed; all pages of the sg entry are
145 	if (walk->offset >= walk->sg->offset + walk->sg->length)
146 		scatterwalk_start(walk, sg_next(walk->sg));
147 	sg_set_page(sg_out, sg_page(walk->sg),
148 		    walk->sg->offset + walk->sg->length - walk->offset,
150 	scatterwalk_crypto_chain(sg_out, sg_next(walk->sg), 2);
155 	struct page *base_page = sg_page(walk->sg);
170 		 * the whole sg entry in the kernel's direct map rather than
173 		 * page of the sg entry.  Either way the result is the address
255 		base_page = sg_page(walk->sg);
275 void memcpy_from_sglist(void *buf, struct scatterlist *sg,
278 void memcpy_to_sglist(struct scatterlist *sg, unsigned int start,
285 static inline void scatterwalk_map_and_copy(void *buf, struct scatterlist *sg,
290 		memcpy_to_sglist(sg, start, buf, nbytes);
292 		memcpy_from_sglist(buf, sg, start, nbytes);