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>
50 #include <vm/vm_page.h>
52 #include <machine/vmparam.h>
55 * Implement uiomove(9) from physical memory using the direct map to
56 * avoid the creation and destruction of ephemeral mappings.
59 uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
61 struct thread *td = curthread;
64 vm_offset_t page_offset, vaddr;
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 save = td->td_pflags & TDP_DEADLKTREAT;
75 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 if (uio->uio_segflg != UIO_NOCOPY) {
90 mapped = pmap_map_io_transient(
91 &ma[offset >> PAGE_SHIFT], &vaddr, 1, TRUE);
92 cp = (char *)vaddr + page_offset;
94 switch (uio->uio_segflg) {
97 if (uio->uio_rw == UIO_READ)
98 error = copyout(cp, iov->iov_base, cnt);
100 error = copyin(iov->iov_base, cp, cnt);
105 if (uio->uio_rw == UIO_READ)
106 bcopy(cp, iov->iov_base, cnt);
108 bcopy(iov->iov_base, cp, cnt);
113 if (__predict_false(mapped)) {
114 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT],
118 iov->iov_base = (char *)iov->iov_base + cnt;
120 uio->uio_resid -= cnt;
121 uio->uio_offset += cnt;
126 if (__predict_false(mapped)) {
127 panic("ARM64TODO: uiomove_fromphys");
128 pmap_unmap_io_transient(&ma[offset >> PAGE_SHIFT], &vaddr, 1,
132 td->td_pflags &= ~TDP_DEADLKTREAT;