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.
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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.
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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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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/sf_buf.h>
53 #include <vm/vm_page.h>
54 #include <vm/vm_param.h>
56 #include <machine/cache.h>
57 #include <machine/tlb.h>
60 * Implement uiomove(9) from physical memory using a combination
61 * of the direct mapping and sf_bufs to reduce the creation and
62 * destruction of ephemeral mappings.
65 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
68 struct thread *td = curthread;
71 vm_offset_t page_offset;
78 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
79 ("uiomove_fromphys: mode"));
80 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
81 ("uiomove_fromphys proc"));
82 save = td->td_pflags & TDP_DEADLKTREAT;
83 td->td_pflags |= TDP_DEADLKTREAT;
84 while (n > 0 && uio->uio_resid) {
94 page_offset = offset & PAGE_MASK;
95 cnt = ulmin(cnt, PAGE_SIZE - page_offset);
96 m = ma[offset >> PAGE_SHIFT];
97 pa = VM_PAGE_TO_PHYS(m);
98 if (dcache_color_ignore == 0 &&
99 m->md.color != DCACHE_COLOR(pa)) {
100 sf = sf_buf_alloc(m, 0);
101 cp = (char *)sf_buf_kva(sf) + page_offset;
104 cp = (char *)TLB_PHYS_TO_DIRECT(pa) + page_offset;
106 switch (uio->uio_segflg) {
109 if (uio->uio_rw == UIO_READ)
110 error = copyout(cp, iov->iov_base, cnt);
112 error = copyin(iov->iov_base, cp, cnt);
120 if (uio->uio_rw == UIO_READ)
121 bcopy(cp, iov->iov_base, cnt);
123 bcopy(iov->iov_base, cp, cnt);
130 iov->iov_base = (char *)iov->iov_base + cnt;
132 uio->uio_resid -= cnt;
133 uio->uio_offset += cnt;
139 td->td_pflags &= ~TDP_DEADLKTREAT;