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.
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35 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
36 * $FreeBSD: src/sys/i386/i386/uio_machdep.c,v 1.1 2004/03/21 20:28:36 alc Exp $
37 * $DragonFly: src/sys/i386/i386/Attic/uio_machdep.c,v 1.7 2004/08/18 09:16:16 dillon Exp $
40 #include <sys/param.h>
41 #include <sys/kernel.h>
44 #include <sys/sfbuf.h>
45 #include <sys/systm.h>
47 #include <sys/thread2.h>
50 #include <vm/vm_page.h>
53 * Implement uiomove(9) from physical memory using sf_bufs to reduce
54 * the creation and destruction of ephemeral mappings.
57 uiomove_fromphys(vm_page_t *ma, vm_offset_t offset, int n, struct uio *uio)
60 struct thread *td = curthread;
63 vm_offset_t page_offset;
69 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
70 ("uiomove_fromphys: mode"));
71 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
72 ("uiomove_fromphys proc"));
75 save = td->td_flags & TDF_DEADLKTREAT;
76 td->td_flags |= TDF_DEADLKTREAT;
79 while (n > 0 && uio->uio_resid) {
89 page_offset = offset & PAGE_MASK;
90 cnt = min(cnt, PAGE_SIZE - page_offset);
91 m = ma[offset >> PAGE_SHIFT];
92 sf = sf_buf_alloc(m, SFBA_QUICK);
93 cp = (char *)sf_buf_kva(sf) + page_offset;
94 switch (uio->uio_segflg) {
97 * note: removed uioyield (it was the wrong place to
100 if (uio->uio_rw == UIO_READ)
101 error = copyout(cp, iov->iov_base, cnt);
103 error = copyin(iov->iov_base, cp, cnt);
110 if (uio->uio_rw == UIO_READ)
111 bcopy(cp, iov->iov_base, cnt);
113 bcopy(iov->iov_base, cp, cnt);
119 iov->iov_base = (char *)iov->iov_base + cnt;
121 uio->uio_resid -= cnt;
122 uio->uio_offset += cnt;
129 td->td_flags &= ~TDF_DEADLKTREAT;