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
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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
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17 * notice, this list of conditions and the following disclaimer.
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22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
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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>
50 #include <sys/sf_buf.h>
53 #include <vm/vm_page.h>
55 #include <machine/cpu.h>
56 #include <machine/vmparam.h>
57 #include <machine/md_var.h>
60 * Implement uiomove(9) from physical memory using sf_bufs to
61 * avoid the creation and destruction of ephemeral mappings.
64 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
66 struct thread *td = curthread;
69 vm_offset_t page_offset;
76 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
77 ("uiomove_fromphys: mode"));
78 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
79 ("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 = min(cnt, PAGE_SIZE - page_offset);
96 m = ma[offset >> PAGE_SHIFT];
97 sf = sf_buf_alloc(m, 0);
98 cp = (char*)sf_buf_kva(sf) + page_offset;
100 switch (uio->uio_segflg) {
103 if (uio->uio_rw == UIO_READ)
104 error = copyout(cp, iov->iov_base, cnt);
106 error = copyin(iov->iov_base, cp, cnt);
113 if (uio->uio_rw == UIO_READ)
114 bcopy(cp, iov->iov_base, cnt);
116 bcopy(iov->iov_base, cp, cnt);
122 iov->iov_base = (char *)iov->iov_base + cnt;
124 uio->uio_resid -= cnt;
125 uio->uio_offset += cnt;
131 td->td_pflags &= ~TDP_DEADLKTREAT;