2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * $DragonFly: src/sys/sys/xio.h,v 1.5 2004/07/16 05:51:57 dillon Exp $
38 * The XIO structure is intended to replace UIO for messaged I/O operations
39 * within the kernel. The originator of the transaction must supply an XIO
40 * structure containing a list of appropriate held vm_page's representing
41 * the buffer. The target of the transaction will generally map the
42 * pages using the SF_BUF facility, complete the operation, and reply the
48 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
50 #ifndef _SYS_MSGPORT_H_
51 #include <sys/msgport.h>
54 #define XIO_INTERNAL_PAGES btoc(MAXPHYS)
55 #define XIO_INTERNAL_SIZE (XIO_INTERNAL_PAGES * PAGE_SIZE)
60 struct vm_page **xio_pages;
61 int xio_npages; /* number of pages in xio_pages[] array */
62 int xio_offset; /* byte offset (may exceed a page) */
63 int xio_bytes; /* number of bytes to transfer */
66 struct vm_page *xio_internal_pages[XIO_INTERNAL_PAGES];
69 typedef struct xio *xio_t;
71 #define XIOF_READ 0x0001
72 #define XIOF_WRITE 0x0002
73 #define XIOF_LINMAP 0x0004
79 void xio_init(xio_t xio);
80 int xio_init_ubuf(xio_t xio, void *ubase, size_t ubytes, int vmprot);
81 int xio_init_kbuf(xio_t xio, void *kbase, size_t kbytes);
82 void xio_release(xio_t xio);
83 int xio_uio_copy(xio_t xio, struct uio *uio, int *sizep);
84 int xio_copy_xtou(xio_t xio, void *uptr, int bytes);
85 int xio_copy_xtok(xio_t xio, void *kptr, int bytes);
89 #endif /* !_SYS_XIO_H_ */