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
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include <sys/param.h>
42 #include <sys/kernel.h>
44 #include <sys/mutex.h>
46 #include <sys/systm.h>
48 #include <sys/sf_buf.h>
51 #include <vm/vm_page.h>
53 #include <machine/vmparam.h>
56 * Implement uiomove(9) from physical memory using sf_bufs to
57 * avoid the creation and destruction of ephemeral mappings.
60 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;
71 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
72 ("uiomove_fromphys: mode"));
73 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
74 ("uiomove_fromphys proc"));
75 save = td->td_pflags & TDP_DEADLKTREAT;
76 td->td_pflags |= TDP_DEADLKTREAT;
77 while (n > 0 && uio->uio_resid) {
87 page_offset = offset & PAGE_MASK;
88 cnt = min(cnt, PAGE_SIZE - page_offset);
89 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
90 cp = (char*)sf_buf_kva(sf) + page_offset;
91 switch (uio->uio_segflg) {
94 if (uio->uio_rw == UIO_READ)
95 error = copyout(cp, iov->iov_base, cnt);
97 error = copyin(iov->iov_base, cp, cnt);
104 if (uio->uio_rw == UIO_READ)
105 bcopy(cp, iov->iov_base, cnt);
107 bcopy(iov->iov_base, cp, cnt);
113 iov->iov_base = (char *)iov->iov_base + cnt;
115 uio->uio_resid -= cnt;
116 uio->uio_offset += cnt;
122 td->td_pflags &= ~TDP_DEADLKTREAT;