1 /* 2 * Copyright (c) 2004 Matthew Dillon <dillon@backplane.com> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $DragonFly: src/sys/sys/xio.h,v 1.4 2004/06/06 19:16:51 dillon Exp $ 27 */ 28 29 /* 30 * The XIO structure is intended to replace UIO for messaged I/O operations 31 * within the kernel. The originator of the transaction must supply an XIO 32 * structure containing a list of appropriate held vm_page's representing 33 * the buffer. The target of the transaction will generally map the 34 * pages using the SF_BUF facility, complete the operation, and reply the 35 * message. 36 */ 37 #ifndef _SYS_XIO_H_ 38 #define _SYS_XIO_H_ 39 40 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 41 42 #ifndef _SYS_MSGPORT_H_ 43 #include <sys/msgport.h> 44 #endif 45 46 #define XIO_INTERNAL_PAGES btoc(MAXPHYS) 47 #define XIO_INTERNAL_SIZE (XIO_INTERNAL_PAGES * PAGE_SIZE) 48 49 struct vm_page; 50 51 struct xio { 52 struct vm_page **xio_pages; 53 int xio_npages; /* number of pages in xio_pages[] array */ 54 int xio_offset; /* byte offset (may exceed a page) */ 55 int xio_bytes; /* number of bytes to transfer */ 56 int xio_flags; 57 int xio_error; 58 struct vm_page *xio_internal_pages[XIO_INTERNAL_PAGES]; 59 }; 60 61 typedef struct xio *xio_t; 62 63 #define XIOF_READ 0x0001 64 #define XIOF_WRITE 0x0002 65 #define XIOF_LINMAP 0x0004 66 67 #endif 68 69 #if defined(_KERNEL) 70 71 void xio_init(xio_t xio); 72 int xio_init_ubuf(xio_t xio, void *ubase, size_t ubytes, int vmprot); 73 int xio_init_kbuf(xio_t xio, void *kbase, size_t kbytes); 74 void xio_release(xio_t xio); 75 int xio_uio_copy(xio_t xio, struct uio *uio, int *sizep); 76 int xio_copy_xtou(xio_t xio, void *uptr, int bytes); 77 int xio_copy_xtok(xio_t xio, void *kptr, int bytes); 78 79 #endif /* _KERNEL */ 80 81 #endif /* !_SYS_XIO_H_ */ 82