2 * Copyright (c) 2004 Alan L. Cox <alc@cs.rice.edu>
3 * Copyright (c) 1982, 1986, 1991, 1993
4 * The Regents of the University of California. All rights reserved.
5 * (c) UNIX System Laboratories, Inc.
6 * All or some portions of this file are derived from material licensed
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8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
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12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions and the following disclaimer.
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19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
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39 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/param.h>
46 #include <sys/kernel.h>
48 #include <sys/mutex.h>
50 #include <sys/systm.h>
52 #include <sys/sf_buf.h>
55 #include <vm/vm_page.h>
57 #include <machine/vmparam.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;
75 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
76 ("uiomove_fromphys: mode"));
77 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
78 ("uiomove_fromphys proc"));
79 save = td->td_pflags & TDP_DEADLKTREAT;
80 td->td_pflags |= TDP_DEADLKTREAT;
81 while (n > 0 && uio->uio_resid) {
91 page_offset = offset & PAGE_MASK;
92 cnt = min(cnt, PAGE_SIZE - page_offset);
93 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
94 cp = (char*)sf_buf_kva(sf) + page_offset;
95 switch (uio->uio_segflg) {
97 if (ticks - PCPU_GET(switchticks) >= hogticks)
99 if (uio->uio_rw == UIO_READ)
100 error = copyout(cp, iov->iov_base, cnt);
102 error = copyin(iov->iov_base, cp, cnt);
109 if (uio->uio_rw == UIO_READ)
110 bcopy(cp, iov->iov_base, cnt);
112 bcopy(iov->iov_base, cp, cnt);
118 iov->iov_base = (char *)iov->iov_base + cnt;
120 uio->uio_resid -= cnt;
121 uio->uio_offset += cnt;
127 td->td_pflags &= ~TDP_DEADLKTREAT;