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
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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
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28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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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>
59 * Implement uiomove(9) from physical memory using a combination
60 * of the direct mapping and sf_bufs to reduce the creation and
61 * destruction of ephemeral mappings.
64 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
67 struct thread *td = curthread;
70 vm_offset_t page_offset;
77 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
78 ("uiomove_fromphys: mode"));
79 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
80 ("uiomove_fromphys proc"));
81 save = td->td_pflags & TDP_DEADLKTREAT;
82 td->td_pflags |= TDP_DEADLKTREAT;
83 while (n > 0 && uio->uio_resid) {
93 page_offset = offset & PAGE_MASK;
94 cnt = ulmin(cnt, PAGE_SIZE - page_offset);
95 m = ma[offset >> PAGE_SHIFT];
96 pa = VM_PAGE_TO_PHYS(m);
97 if (MIPS_DIRECT_MAPPABLE(pa)) {
99 cp = (char *)MIPS_PHYS_TO_DIRECT(pa) + page_offset;
101 * flush all mappings to this page, KSEG0 address first
102 * in order to get it overwritten by correct data
104 mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
105 pmap_flush_pvcache(m);
107 sf = sf_buf_alloc(m, 0);
108 cp = (char *)sf_buf_kva(sf) + page_offset;
110 switch (uio->uio_segflg) {
113 if (uio->uio_rw == UIO_READ)
114 error = copyout(cp, iov->iov_base, cnt);
116 error = copyin(iov->iov_base, cp, cnt);
124 if (uio->uio_rw == UIO_READ)
125 bcopy(cp, iov->iov_base, cnt);
127 bcopy(iov->iov_base, cp, cnt);
135 mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
136 iov->iov_base = (char *)iov->iov_base + cnt;
138 uio->uio_resid -= cnt;
139 uio->uio_offset += cnt;
145 td->td_pflags &= ~TDP_DEADLKTREAT;