1 /* $NetBSD: xen_shm.h,v 1.12 2020/04/25 15:26:17 bouyer 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 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 * 26 */ 27 28 #include "opt_xen.h" 29 30 #define XENSHM_MAX_PAGES_PER_REQUEST ((MAXPHYS + PAGE_SIZE) >> PAGE_SHIFT) 31 32 /* 33 * Helper routines for the backend drivers. This implement the necessary 34 * functions to map a bunch of pages from foreign domains in our kernel VM 35 * space, do I/O to it, and unmap it. 36 */ 37 38 int xen_shm_map(int, int, grant_ref_t *, vaddr_t, grant_handle_t *, int); 39 void xen_shm_unmap(vaddr_t, int, grant_handle_t *); 40 41 /* flags for xen_shm_map() */ 42 #define XSHM_RO 0x02 /* map the guest's memory read-only */ 43