1 /* $NetBSD: xen_shm.h,v 1.8 2009/07/29 12:02:06 cegger Exp $ */ 2 3 /* 4 * Copyright (c) 2005 Manuel Bouyer. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by Manuel Bouyer. 17 * 4. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 */ 32 33 #include "opt_xen.h" 34 #include <machine/param.h> 35 36 #define XENSHM_MAX_PAGES_PER_REQUEST (MAXPHYS >> PAGE_SHIFT) 37 38 /* 39 * Helper routines for the backend drivers. This implement the necessary 40 * functions to map a bunch of pages from foreign domains in our kernel VM 41 * space, do I/O to it, and unmap it. 42 */ 43 44 int xen_shm_map(int, int, grant_ref_t *, vaddr_t *, grant_handle_t *, int); 45 void xen_shm_unmap(vaddr_t, int, grant_handle_t *); 46 int xen_shm_callback(int (*)(void *), void *); 47 48 /* flags for xen_shm_map() */ 49 #define XSHM_CALLBACK 0x01 /* called from a callback */ 50 #define XSHM_RO 0x02 /* map the guest's memory read-only */ 51