2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
5 * Copyright (c) 1982, 1986, 1991, 1993
6 * The Regents of the University of California. All rights reserved.
7 * (c) UNIX System Laboratories, Inc.
8 * All or some portions of this file are derived from material licensed
9 * to the University of California by American Telephone and Telegraph
10 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
11 * the permission of UNIX System Laboratories, Inc.
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
16 * 1. Redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer.
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution.
21 * 3. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
40 #include <sys/cdefs.h>
41 __FBSDID("$FreeBSD$");
43 #include <sys/param.h>
44 #include <sys/systm.h>
45 #include <sys/kernel.h>
47 #include <sys/mutex.h>
49 #include <sys/sched.h>
50 #include <sys/sf_buf.h>
54 #include <vm/vm_page.h>
57 * Implement uiomove(9) from physical memory using sf_bufs to reduce
58 * the creation and destruction of ephemeral mappings.
61 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
64 struct thread *td = curthread;
67 vm_offset_t page_offset;
72 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
73 ("uiomove_fromphys: mode"));
74 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
75 ("uiomove_fromphys proc"));
76 save = td->td_pflags & TDP_DEADLKTREAT;
77 td->td_pflags |= TDP_DEADLKTREAT;
78 while (n > 0 && uio->uio_resid) {
88 page_offset = offset & PAGE_MASK;
89 cnt = min(cnt, PAGE_SIZE - page_offset);
91 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], SFB_CPUPRIVATE);
92 cp = (char *)sf_buf_kva(sf) + page_offset;
93 switch (uio->uio_segflg) {
96 if (uio->uio_rw == UIO_READ)
97 error = copyout(cp, iov->iov_base, cnt);
99 error = copyin(iov->iov_base, cp, cnt);
107 if (uio->uio_rw == UIO_READ)
108 bcopy(cp, iov->iov_base, cnt);
110 bcopy(iov->iov_base, cp, cnt);
117 iov->iov_base = (char *)iov->iov_base + cnt;
119 uio->uio_resid -= cnt;
120 uio->uio_offset += cnt;
126 td->td_pflags &= ~TDP_DEADLKTREAT;