1 /* $NetBSD: granttables.h,v 1.1 2006/03/06 20:30:40 bouyer Exp $ */ 2 /* 3 * Copyright (c) 2006 Manuel Bouyer. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Manuel Bouyer. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 */ 31 32 /* Interface to the Xen Grant tables */ 33 #include <machine/xen3-public/grant_table.h> 34 35 /* must be less or equal to what's configured in Xen */ 36 #define NR_GRANT_FRAMES 4 37 38 void xengnt_init(void); 39 40 /* 41 * grant access to a remote domain. Returns a handle on the allocated grant 42 * entry in table in grant_ref_t *. 43 */ 44 int xengnt_grant_access(domid_t, paddr_t, int, grant_ref_t *); 45 46 /* 47 * Revoke access. Caller is responsible to ensure that the grant entry is 48 * not referenced any more. 49 */ 50 void xengnt_revoke_access(grant_ref_t); 51 52 /* allow a page transfer from a remote domain */ 53 int xengnt_grant_transfer(domid_t, grant_ref_t *); 54 55 /* end transfer, return the new page address or 0 */ 56 paddr_t xengnt_revoke_transfer(grant_ref_t); 57 58 /* 59 * Query grant status (i.e. if remote has a valid mapping to this grant). 60 * Returns GTF_reading | GTF_writing. 61 */ 62 int xengnt_status(grant_ref_t); 63