1/*-
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.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
40 */
41
42#include <sys/cdefs.h>
| 1/*-
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.
6 * All or some portions of this file are derived from material licensed
7 * to the University of California by American Telephone and Telegraph
8 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
9 * the permission of UNIX System Laboratories, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 * @(#)kern_subr.c 8.3 (Berkeley) 1/21/94
40 */
41
42#include <sys/cdefs.h>
|
44
45#include <sys/param.h>
46#include <sys/kernel.h>
47#include <sys/lock.h>
48#include <sys/mutex.h>
49#include <sys/proc.h>
50#include <sys/systm.h>
51#include <sys/uio.h>
52#include <sys/sf_buf.h>
53
54#include <vm/vm.h>
55#include <vm/vm_page.h>
56
57#include <machine/vmparam.h>
58
59/*
60 * Implement uiomove(9) from physical memory using sf_bufs to
61 * avoid the creation and destruction of ephemeral mappings.
62 */
63int
64uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
65{
66 struct thread *td = curthread;
67 struct iovec *iov;
68 void *cp;
69 vm_offset_t page_offset;
70 size_t cnt;
71 int error = 0;
72 int save = 0;
73 struct sf_buf *sf;
74
75 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
76 ("uiomove_fromphys: mode"));
77 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
78 ("uiomove_fromphys proc"));
79 save = td->td_pflags & TDP_DEADLKTREAT;
80 td->td_pflags |= TDP_DEADLKTREAT;
81 while (n > 0 && uio->uio_resid) {
82 iov = uio->uio_iov;
83 cnt = iov->iov_len;
84 if (cnt == 0) {
85 uio->uio_iov++;
86 uio->uio_iovcnt--;
87 continue;
88 }
89 if (cnt > n)
90 cnt = n;
91 page_offset = offset & PAGE_MASK;
92 cnt = min(cnt, PAGE_SIZE - page_offset);
93 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
94 cp = (char*)sf_buf_kva(sf) + page_offset;
95 switch (uio->uio_segflg) {
96 case UIO_USERSPACE:
97 if (ticks - PCPU_GET(switchticks) >= hogticks)
98 uio_yield();
99 if (uio->uio_rw == UIO_READ)
100 error = copyout(cp, iov->iov_base, cnt);
101 else
102 error = copyin(iov->iov_base, cp, cnt);
| 44
45#include <sys/param.h>
46#include <sys/kernel.h>
47#include <sys/lock.h>
48#include <sys/mutex.h>
49#include <sys/proc.h>
50#include <sys/systm.h>
51#include <sys/uio.h>
52#include <sys/sf_buf.h>
53
54#include <vm/vm.h>
55#include <vm/vm_page.h>
56
57#include <machine/vmparam.h>
58
59/*
60 * Implement uiomove(9) from physical memory using sf_bufs to
61 * avoid the creation and destruction of ephemeral mappings.
62 */
63int
64uiomove_fromphys(vm_page_t ma[], vm_offset_t offset, int n, struct uio *uio)
65{
66 struct thread *td = curthread;
67 struct iovec *iov;
68 void *cp;
69 vm_offset_t page_offset;
70 size_t cnt;
71 int error = 0;
72 int save = 0;
73 struct sf_buf *sf;
74
75 KASSERT(uio->uio_rw == UIO_READ || uio->uio_rw == UIO_WRITE,
76 ("uiomove_fromphys: mode"));
77 KASSERT(uio->uio_segflg != UIO_USERSPACE || uio->uio_td == curthread,
78 ("uiomove_fromphys proc"));
79 save = td->td_pflags & TDP_DEADLKTREAT;
80 td->td_pflags |= TDP_DEADLKTREAT;
81 while (n > 0 && uio->uio_resid) {
82 iov = uio->uio_iov;
83 cnt = iov->iov_len;
84 if (cnt == 0) {
85 uio->uio_iov++;
86 uio->uio_iovcnt--;
87 continue;
88 }
89 if (cnt > n)
90 cnt = n;
91 page_offset = offset & PAGE_MASK;
92 cnt = min(cnt, PAGE_SIZE - page_offset);
93 sf = sf_buf_alloc(ma[offset >> PAGE_SHIFT], 0);
94 cp = (char*)sf_buf_kva(sf) + page_offset;
95 switch (uio->uio_segflg) {
96 case UIO_USERSPACE:
97 if (ticks - PCPU_GET(switchticks) >= hogticks)
98 uio_yield();
99 if (uio->uio_rw == UIO_READ)
100 error = copyout(cp, iov->iov_base, cnt);
101 else
102 error = copyin(iov->iov_base, cp, cnt);
|
105 break;
106 case UIO_SYSSPACE:
107 if (uio->uio_rw == UIO_READ)
108 bcopy(cp, iov->iov_base, cnt);
109 else
110 bcopy(iov->iov_base, cp, cnt);
111 break;
112 case UIO_NOCOPY:
113 break;
114 }
115 sf_buf_free(sf);
116 iov->iov_base = (char *)iov->iov_base + cnt;
117 iov->iov_len -= cnt;
118 uio->uio_resid -= cnt;
119 uio->uio_offset += cnt;
120 offset += cnt;
121 n -= cnt;
122 }
123out:
124 if (save == 0)
125 td->td_pflags &= ~TDP_DEADLKTREAT;
126 return (error);
127}
| 107 break;
108 case UIO_SYSSPACE:
109 if (uio->uio_rw == UIO_READ)
110 bcopy(cp, iov->iov_base, cnt);
111 else
112 bcopy(iov->iov_base, cp, cnt);
113 break;
114 case UIO_NOCOPY:
115 break;
116 }
117 sf_buf_free(sf);
118 iov->iov_base = (char *)iov->iov_base + cnt;
119 iov->iov_len -= cnt;
120 uio->uio_resid -= cnt;
121 uio->uio_offset += cnt;
122 offset += cnt;
123 n -= cnt;
124 }
125out:
126 if (save == 0)
127 td->td_pflags &= ~TDP_DEADLKTREAT;
128 return (error);
129}
|