1 /* 2 * Copyright (c) 2003,2004 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Matthew Dillon <dillon@backplane.com> 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 * 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 16 * distribution. 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. 20 * 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 32 * SUCH DAMAGE. 33 * 34 * $DragonFly: src/sys/sys/xio.h,v 1.5 2004/07/16 05:51:57 dillon Exp $ 35 */ 36 37 /* 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 43 * message. 44 */ 45 #ifndef _SYS_XIO_H_ 46 #define _SYS_XIO_H_ 47 48 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 49 50 #ifndef _SYS_MSGPORT_H_ 51 #include <sys/msgport.h> 52 #endif 53 54 #define XIO_INTERNAL_PAGES btoc(MAXPHYS) 55 #define XIO_INTERNAL_SIZE (XIO_INTERNAL_PAGES * PAGE_SIZE) 56 57 struct vm_page; 58 59 struct xio { 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 */ 64 int xio_flags; 65 int xio_error; 66 struct vm_page *xio_internal_pages[XIO_INTERNAL_PAGES]; 67 }; 68 69 typedef struct xio *xio_t; 70 71 #define XIOF_READ 0x0001 72 #define XIOF_WRITE 0x0002 73 #define XIOF_LINMAP 0x0004 74 75 #endif 76 77 #if defined(_KERNEL) 78 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); 86 87 #endif /* _KERNEL */ 88 89 #endif /* !_SYS_XIO_H_ */ 90