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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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/kernel.h>
46 #include <sys/mutex.h>
48 #include <sys/systm.h>
52 #include <vm/vm_page.h>
54 #include <machine/vmparam.h>
57 * Implement uiomove(9) from physical memory using the direct map to
58 * avoid the creation and destruction of ephemeral mappings.
61 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
63 struct thread *td = curthread;
66 vm_offset_t page_offset, vaddr;
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;
79 while (n > 0 && uio->uio_resid) {
89 page_offset = offset & PAGE_MASK;
90 cnt = min(cnt, PAGE_SIZE - page_offset);
91 if (uio->uio_segflg != UIO_NOCOPY) {
92 mapped = pmap_map_io_transient(
93 &ma[offset >> PAGE_SHIFT], &vaddr, 1, TRUE);
94 cp = (char *)vaddr + page_offset;
96 switch (uio->uio_segflg) {
99 if (uio->uio_rw == UIO_READ)
100 error = copyout(cp, iov->iov_base, cnt);
102 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);
115 if (__predict_false(mapped)) {
116 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT],
120 iov->iov_base = (char *)iov->iov_base + cnt;
122 uio->uio_resid -= cnt;
123 uio->uio_offset += cnt;
128 if (__predict_false(mapped))
129 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], &vaddr, 1,
132 td->td_pflags &= ~TDP_DEADLKTREAT;