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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21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
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39 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
40 * $FreeBSD: src/sys/i386/i386/uio_machdep.c,v 1.1 2004/03/21 20:28:36 alc Exp $
41 * $DragonFly: src/sys/i386/i386/Attic/uio_machdep.c,v 1.4 2004/05/04 12:05:29 hmp Exp $
44 #include <sys/param.h>
45 #include <sys/kernel.h>
48 #include <sys/sfbuf.h>
49 #include <sys/systm.h>
51 #include <sys/thread2.h>
54 #include <vm/vm_page.h>
57 * Implement uiomove(9) from physical memory using sf_bufs to reduce
58 * the creation and destruction of ephemeral mappings.
61 uiomove_fromphys(vm_page_t *ma, vm_offset_t offset, int n, struct uio *uio)
64 struct thread *td = curthread;
67 vm_offset_t page_offset;
73 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
74 ("uiomove_fromphys: mode"));
75 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
76 ("uiomove_fromphys proc"));
79 save = td->td_flags & TDF_DEADLKTREAT;
80 td->td_flags |= TDF_DEADLKTREAT;
83 while (n > 0 && uio->uio_resid) {
93 page_offset = offset & PAGE_MASK;
94 cnt = min(cnt, PAGE_SIZE - page_offset);
95 m = ma[offset >> PAGE_SHIFT];
96 sf = sf_buf_alloc(m, SFBA_QUICK);
97 cp = (char *)sf_buf_kva(sf) + page_offset;
98 switch (uio->uio_segflg) {
101 * note: removed uioyield (it was the wrong place to
104 if (uio->uio_rw == UIO_READ)
105 error = copyout(cp, iov->iov_base, cnt);
107 error = copyin(iov->iov_base, cp, cnt);
112 if (uio->uio_rw == UIO_READ)
113 bcopy(cp, iov->iov_base, cnt);
115 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;
132 td->td_flags &= ~TDF_DEADLKTREAT;