1 // SPDX-License-Identifier: GPL-2.0-or-later
9  *               2004 Jean-Luc Cooke <jlcooke@certainkey.com>
20 	struct scatterlist *sg = walk->sg;  in scatterwalk_skip()
22 	nbytes += walk->offset - sg->offset;  in scatterwalk_skip()
24 	while (nbytes > sg->length) {  in scatterwalk_skip()
25 		nbytes -= sg->length;  in scatterwalk_skip()
28 	walk->sg = sg;  in scatterwalk_skip()
29 	walk->offset = sg->offset + nbytes;  in scatterwalk_skip()
40 		memcpy(buf, walk->addr, to_copy);  in memcpy_from_scatterwalk()
43 		nbytes -= to_copy;  in memcpy_from_scatterwalk()
55 		memcpy(walk->addr, buf, to_copy);  in memcpy_to_scatterwalk()
58 		nbytes -= to_copy;  in memcpy_to_scatterwalk()
90  * memcpy_sglist() - Copy data from one scatterlist to another
96  * function is a no-op.  No other overlaps are supported.
105 	if (unlikely(nbytes == 0)) /* in case src and/or dst is NULL */  in memcpy_sglist()
108 	src_offset = src->offset;  in memcpy_sglist()
109 	dst_offset = dst->offset;  in memcpy_sglist()
112 		unsigned int len = min3(src->offset + src->length - src_offset,  in memcpy_sglist()  local
113 					dst->offset + dst->length - dst_offset,  in memcpy_sglist()
124 			const unsigned int limit = PAGE_SIZE;  in memcpy_sglist()  local
126 			/* Further limit len to not cross a page boundary. */  in memcpy_sglist()
127 			len = min3(len, limit - src_oip, limit - dst_oip);  in memcpy_sglist()
136 					    src_page, src_oip, len);  in memcpy_sglist()
142 				       len);  in memcpy_sglist()
155 				memcpy(dst_virt, src_virt, len);  in memcpy_sglist()
158 						dst_page, dst_offset, len);  in memcpy_sglist()
161 		nbytes -= len;  in memcpy_sglist()
169 		src_offset += len;  in memcpy_sglist()
170 		if (src_offset >= src->offset + src->length) {  in memcpy_sglist()
172 			src_offset = src->offset;  in memcpy_sglist()
174 		dst_offset += len;  in memcpy_sglist()
175 		if (dst_offset >= dst->offset + dst->length) {  in memcpy_sglist()
177 			dst_offset = dst->offset;  in memcpy_sglist()
185 				     unsigned int len)  in scatterwalk_ffwd()  argument
188 		if (!len)  in scatterwalk_ffwd()
191 		if (src->length > len)  in scatterwalk_ffwd()
194 		len -= src->length;  in scatterwalk_ffwd()
199 	sg_set_page(dst, sg_page(src), src->length - len, src->offset + len);  in scatterwalk_ffwd()