1/*
2 * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
29/*
30 * Copyright (c) 1982, 1986, 1993, 1994
31 * The Regents of the University of California. All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 * 1. Redistributions of source code must retain the above copyright
37 * notice, this list of conditions and the following disclaimer.
38 * 2. Redistributions in binary form must reproduce the above copyright
39 * notice, this list of conditions and the following disclaimer in the
40 * documentation and/or other materials provided with the distribution.
41 * 3. All advertising materials mentioning features or use of this software
42 * must display the following acknowledgement:
43 * This product includes software developed by the University of
44 * California, Berkeley and its contributors.
45 * 4. Neither the name of the University nor the names of its contributors
46 * may be used to endorse or promote products derived from this software
47 * without specific prior written permission.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
59 * SUCH DAMAGE.
60 *
61 * @(#)uio.h 8.5 (Berkeley) 2/22/94
62 */
63
64#ifndef _SYS_UIO_INTERNAL_H_
65#define _SYS_UIO_INTERNAL_H_
66
67#include <sys/appleapiopts.h>
68
69#ifdef KERNEL_PRIVATE
70#include <sys/uio.h>
71#include <sys/malloc.h>
72#include <sys/param.h>
73
74/*
75 * user / kernel address space type flags.
76 * WARNING - make sure to check when adding flags! Be sure new flags
77 * don't overlap the definitions in uio.h
78 */
79// UIO_USERSPACE 0 defined in uio.h
80#define UIO_USERISPACE 1
81// UIO_SYSSPACE 2 defined in uio.h
82#define UIO_PHYS_USERSPACE 3
83#define UIO_PHYS_SYSSPACE 4
84// UIO_USERSPACE32 5 defined in uio.h
85#define UIO_USERISPACE32 6
86#define UIO_PHYS_USERSPACE32 7
87// UIO_USERSPACE64 8 defined in uio.h
88#define UIO_USERISPACE64 9
89#define UIO_PHYS_USERSPACE64 10
90// UIO_SYSSPACE32 11 defined in uio.h
91// UIO_PHYS_SYSSPACE32 12 reserved, never used. Use UIO_PHYS_SYSSPACE
92// UIO_SYSSPACE64 13 reserved, never used. Use UIO_SYSSPACE
93// UIO_PHYS_SYSSPACE64 14 reserved, never used. Use UIO_PHYS_SYSSPACE
94
95__BEGIN_DECLS
96struct user_iovec;
97
98#ifdef XNU_KERNEL_PRIVATE
99__private_extern__ struct user_iovec * uio_iovsaddr( uio_t a_uio );
100__private_extern__ int uio_calculateresid( uio_t a_uio );
101__private_extern__ void uio_setcurriovlen( uio_t a_uio, user_size_t a_value );
102__private_extern__ int uio_spacetype( uio_t a_uio );
103__private_extern__ uio_t uio_createwithbuffer( int a_iovcount, off_t a_offset, int a_spacetype, int a_iodirection, void *a_buf_p, size_t a_buffer_size );
104__private_extern__ int copyin_user_iovec_array(user_addr_t uaddr, int spacetype, int count, struct user_iovec *dst);
105/* reverse of uio_update to "undo" uncommited I/O. This only works in
106 * limited cases */
107__private_extern__ void uio_pushback( uio_t a_uio, user_size_t a_count );
108#endif /* XNU_KERNEL_PRIVATE */
109
110/* use kern_iovec for system space requests */
111struct kern_iovec {
112 u_int64_t iov_base; /* Base address. */
113 u_int64_t iov_len; /* Length. */
114};
115
116/* use user_iovec for user space requests */
117struct user_iovec {
118 user_addr_t iov_base; /* Base address. */
119 user_size_t iov_len; /* Length. */
120};
121
122/* use user32_iovec/user64_iovec for representing
123 * in-memory structures in 32-64 processes during copyin */
124struct user32_iovec {
125 uint32_t iov_base; /* Base address. */
126 uint32_t iov_len; /* Length. */
127};
128
129struct user64_iovec {
130 uint64_t iov_base; /* Base address. */
131 uint64_t iov_len; /* Length. */
132};
133
134union iovecs {
135 struct kern_iovec *kiovp;
136 struct user_iovec *uiovp;
137};
138
139/* WARNING - use accessor calls for uio_iov and uio_resid since these */
140/* fields vary depending on the originating address space. */
141struct uio {
142 union iovecs uio_iovs; /* current iovec */
143 int uio_iovcnt; /* active iovecs */
144 off_t uio_offset;
145 enum uio_seg uio_segflg;
146 enum uio_rw uio_rw;
147 user_size_t uio_resid_64;
148 int uio_size; /* size for use with kfree */
149 int uio_max_iovs; /* max number of iovecs this uio_t can hold */
150 u_int32_t uio_flags;
151};
152
153/* values for uio_flags */
154#define UIO_FLAGS_INITED 0x00000001
155#define UIO_FLAGS_WE_ALLOCED 0x00000002
156#define UIO_FLAGS_IS_COMPRESSED_FILE 0x00000004
157
158__END_DECLS
159
160/*
161 * UIO_SIZEOF - return the amount of space a uio_t requires to
162 * contain the given number of iovecs. Use this macro to
163 * create a stack buffer that can be passed to uio_createwithbuffer.
164 */
165#define UIO_SIZEOF( a_iovcount ) \
166 ( sizeof(struct uio) + (MAX(sizeof(struct user_iovec), sizeof(struct kern_iovec)) * (a_iovcount)) )
167
168#define UIO_IS_USER_SPACE32( a_uio_t ) \
169 ( (a_uio_t)->uio_segflg == UIO_USERSPACE32 || (a_uio_t)->uio_segflg == UIO_PHYS_USERSPACE32 || \
170 (a_uio_t)->uio_segflg == UIO_USERISPACE32 )
171#define UIO_IS_USER_SPACE64( a_uio_t ) \
172 ( (a_uio_t)->uio_segflg == UIO_USERSPACE64 || (a_uio_t)->uio_segflg == UIO_PHYS_USERSPACE64 || \
173 (a_uio_t)->uio_segflg == UIO_USERISPACE64 )
174#define UIO_IS_USER_SPACE( a_uio_t ) \
175 ( UIO_IS_USER_SPACE32((a_uio_t)) || UIO_IS_USER_SPACE64((a_uio_t)) || \
176 (a_uio_t)->uio_segflg == UIO_USERSPACE || (a_uio_t)->uio_segflg == UIO_USERISPACE || \
177 (a_uio_t)->uio_segflg == UIO_PHYS_USERSPACE )
178#define UIO_IS_SYS_SPACE( a_uio_t ) \
179 ( (a_uio_t)->uio_segflg == UIO_SYSSPACE || (a_uio_t)->uio_segflg == UIO_PHYS_SYSSPACE || \
180 (a_uio_t)->uio_segflg == UIO_SYSSPACE32 )
181
182extern int ureadc(int c, struct uio *uio);
183
184#endif /* KERNEL_PRIVATE */
185#endif /* !_SYS_UIO_INTERNAL_H_ */
186