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
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7 * (c) UNIX System Laboratories, Inc.
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37 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
40 #include <sys/cdefs.h>
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
45 #include <sys/mutex.h>
47 #include <sys/sched.h>
48 #include <sys/sf_buf.h>
52 #include <vm/vm_page.h>
55 * Implement uiomove(9) from physical memory using sf_bufs to reduce
56 * the creation and destruction of ephemeral mappings.
59 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
62 struct thread *td = curthread;
65 vm_offset_t page_offset;
70 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
71 ("uiomove_fromphys: mode"));
72 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
73 ("uiomove_fromphys proc"));
74 KASSERT(uio->uio_resid >= 0,
75 ("%s: uio %p resid underflow", __func__, uio));
77 save = td->td_pflags & TDP_DEADLKTREAT;
78 td->td_pflags |= TDP_DEADLKTREAT;
79 while (n > 0 && uio->uio_resid) {
80 KASSERT(uio->uio_iovcnt > 0,
81 ("%s: uio %p iovcnt underflow", __func__, uio));
92 page_offset = offset & PAGE_MASK;
93 cnt = min(cnt, PAGE_SIZE - page_offset);
95 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], SFB_CPUPRIVATE);
96 cp = (char *)sf_buf_kva(sf) + page_offset;
97 switch (uio->uio_segflg) {
100 if (uio->uio_rw == UIO_READ)
101 error = copyout(cp, iov->iov_base, cnt);
103 error = copyin(iov->iov_base, cp, cnt);
111 if (uio->uio_rw == UIO_READ)
112 bcopy(cp, iov->iov_base, cnt);
114 bcopy(iov->iov_base, cp, cnt);
121 iov->iov_base = (char *)iov->iov_base + cnt;
123 uio->uio_resid -= cnt;
124 uio->uio_offset += cnt;
130 td->td_pflags &= ~TDP_DEADLKTREAT;