master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)uio.h 8.5 (Berkeley) 2/22/94
32 */
33
34#ifndef _SYS_UIO_H_
35#define _SYS_UIO_H_
36
37#include <sys/cdefs.h>
38#include <sys/_types.h>
39#include <sys/_iovec.h>
40#include <sys/_uio.h>
41
42#ifndef _SSIZE_T_DECLARED
43typedef __ssize_t ssize_t;
44#define _SSIZE_T_DECLARED
45#endif
46
47#ifndef _OFF_T_DECLARED
48typedef __off_t off_t;
49#define _OFF_T_DECLARED
50#endif
51
52#ifdef _KERNEL
53
54struct uio {
55 struct iovec *uio_iov; /* scatter/gather list */
56 int uio_iovcnt; /* length of scatter/gather list */
57 off_t uio_offset; /* offset in target object */
58 ssize_t uio_resid; /* remaining bytes to process */
59 enum uio_seg uio_segflg; /* address space */
60 enum uio_rw uio_rw; /* operation */
61 struct thread *uio_td; /* owner */
62};
63
64/*
65 * Limits
66 *
67 * N.B.: UIO_MAXIOV must be no less than IOV_MAX from <sys/syslimits.h>
68 * which in turn must be no less than _XOPEN_IOV_MAX from <limits.h>. If
69 * we ever make this tunable (probably pointless), then IOV_MAX should be
70 * removed from <sys/syslimits.h> and applications would be expected to use
71 * sysconf(3) to find out the correct value, or else assume the worst
72 * (_XOPEN_IOV_MAX). Perhaps UIO_MAXIOV should be simply defined as
73 * IOV_MAX.
74 */
75#define UIO_MAXIOV 1024 /* max 1K of iov's */
76
77struct vm_object;
78struct vm_page;
79struct bus_dma_segment;
80
81struct uio *allocuio(u_int iovcnt);
82void freeuio(struct uio *uio);
83struct uio *cloneuio(struct uio *uiop);
84int copyiniov(const struct iovec *iovp, u_int iovcnt, struct iovec **iov,
85 int error);
86int copyinuio(const struct iovec *iovp, u_int iovcnt, struct uio **uiop);
87int copyout_map(struct thread *td, vm_offset_t *addr, size_t sz);
88int copyout_unmap(struct thread *td, vm_offset_t addr, size_t sz);
89int physcopyin(void *src, vm_paddr_t dst, size_t len);
90int physcopyout(vm_paddr_t src, void *dst, size_t len);
91int physcopyin_vlist(struct bus_dma_segment *src, off_t offset,
92 vm_paddr_t dst, size_t len);
93int physcopyout_vlist(vm_paddr_t src, struct bus_dma_segment *dst,
94 off_t offset, size_t len);
95int uiomove(void *cp, int n, struct uio *uio);
96int uiomove_frombuf(void *buf, int buflen, struct uio *uio);
97int uiomove_fromphys(struct vm_page *ma[], vm_offset_t offset, int n,
98 struct uio *uio);
99int uiomove_nofault(void *cp, int n, struct uio *uio);
100int uiomove_object(struct vm_object *obj, off_t obj_size, struct uio *uio);
101
102#else /* !_KERNEL */
103
104__BEGIN_DECLS
105ssize_t readv(int, const struct iovec *, int);
106ssize_t writev(int, const struct iovec *, int);
107#if __BSD_VISIBLE
108ssize_t preadv(int, const struct iovec *, int, off_t);
109ssize_t pwritev(int, const struct iovec *, int, off_t);
110#endif
111__END_DECLS
112
113#endif /* _KERNEL */
114
115#endif /* !_SYS_UIO_H_ */