4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
27 /* All Rights Reserved */
30 * University Copyright- Copyright (c) 1982, 1986, 1988
31 * The Regents of the University of California
34 * University Acknowledgment- Portions of this document are derived from
35 * software developed by the University of California, Berkeley, and its
40 * The uio support from OpenSolaris has been added as a short term
41 * work around. The hope is to adopt native Linux type and drop the
42 * use of uio's entirely. Under Linux they only add overhead and
43 * when possible we want to use native APIs for the ZPL layer.
47 #include <sys/types.h>
48 #include <sys/uio_impl.h>
51 * Move "n" bytes at byte address "p"; "rw" indicates the direction
52 * of the move, and the I/O parameters are provided in "uio", which is
53 * update to reflect the data which was moved. Returns 0 on success or
54 * a non-zero errno on failure.
57 uiomove(void *p, size_t n, enum uio_rw rw, struct uio *uio)
62 while (n && uio->uio_resid) {
64 cnt = MIN(iov->iov_len, n);
70 switch (uio->uio_segflg) {
73 /* p = kernel data pointer
74 * iov->iov_base = user data pointer */
77 if (copy_to_user(iov->iov_base, p, cnt))
79 /* error = xcopyout_nta(p, iov->iov_base, cnt,
80 * (uio->uio_extflg & UIO_COPY_CACHED)); */
82 /* error = xcopyin_nta(iov->iov_base, p, cnt,
83 * (uio->uio_extflg & UIO_COPY_CACHED)); */
84 if (copy_from_user(p, iov->iov_base, cnt))
90 bcopy(p, iov->iov_base, cnt);
92 bcopy(iov->iov_base, p, cnt);
97 uio->uio_resid -= cnt;
98 uio->uio_loffset += cnt;
104 EXPORT_SYMBOL(uiomove);
106 #define fuword8(uptr, vptr) get_user((*vptr), (uptr))
109 * Fault in the pages of the first n bytes specified by the uio structure.
110 * 1 byte in each page is touched and the uio struct is unmodified. Any
111 * error will terminate the process as this is only a best attempt to get
112 * the pages resident.
115 uio_prefaultpages(ssize_t n, struct uio *uio)
124 iovcnt = uio->uio_iovcnt;
126 while ((n > 0) && (iovcnt > 0)) {
127 cnt = MIN(iov->iov_len, n);
129 /* empty iov entry */
136 * touch each page in this segment.
140 switch (uio->uio_segflg) {
143 if (fuword8((uint8_t *) p, &tmp))
150 incr = MIN(cnt, PAGESIZE);
155 * touch the last byte in case it straddles a page.
158 switch (uio->uio_segflg) {
161 if (fuword8((uint8_t *) p, &tmp))
172 EXPORT_SYMBOL(uio_prefaultpages);
175 * same as uiomove() but doesn't modify uio structure.
176 * return in cbytes how many bytes were copied.
179 uiocopy(void *p, size_t n, enum uio_rw rw, struct uio *uio, size_t *cbytes)
185 iovcnt = uio->uio_iovcnt;
188 for (iov = uio->uio_iov; n && iovcnt; iov++, iovcnt--) {
189 cnt = MIN(iov->iov_len, n);
193 switch (uio->uio_segflg) {
197 /* p = kernel data pointer
198 * iov->iov_base = user data pointer */
200 if (rw == UIO_READ) {
201 /* * UIO_READ = copy data from kernel to user * */
202 if (copy_to_user(iov->iov_base, p, cnt))
204 /* error = xcopyout_nta(p, iov->iov_base, cnt,
205 * (uio->uio_extflg & UIO_COPY_CACHED)); */
207 /* * UIO_WRITE = copy data from user to kernel * */
208 /* error = xcopyin_nta(iov->iov_base, p, cnt,
209 * (uio->uio_extflg & UIO_COPY_CACHED)); */
210 if (copy_from_user(p, iov->iov_base, cnt))
217 bcopy(p, iov->iov_base, cnt);
219 bcopy(iov->iov_base, p, cnt);
222 p = (caddr_t)p + cnt;
228 EXPORT_SYMBOL(uiocopy);
231 * Drop the next n chars out of *uiop.
234 uioskip(uio_t *uiop, size_t n)
236 if (n > uiop->uio_resid)
239 iovec_t *iovp = uiop->uio_iov;
240 size_t niovb = MIN(iovp->iov_len, n);
247 iovp->iov_base += niovb;
248 uiop->uio_loffset += niovb;
249 iovp->iov_len -= niovb;
250 uiop->uio_resid -= niovb;
254 EXPORT_SYMBOL(uioskip);