/* $NetBSD: granttables.h,v 1.11 2020/04/05 17:48:30 jdolecek Exp $ */
/*
* Copyright (c) 2006 Manuel Bouyer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* Interface to the Xen Grant tables */
#include <xen/include/public/xen.h>
#include <xen/include/public/grant_table.h>
void xengnt_init(void);
/* suspend/resume grant table, for save/restore operations */
bool xengnt_suspend(void);
bool xengnt_resume(void);
/*
* grant access to a remote domain. Returns a handle on the allocated grant
* entry in table in grant_ref_t *.
*/
int xengnt_grant_access(domid_t, paddr_t, int, grant_ref_t *);
/*
* Revoke access. Caller is responsible to ensure that the grant entry is
* not referenced any more.
*/
void xengnt_revoke_access(grant_ref_t);
/*
* Query grant status (i.e. if remote has a valid mapping to this grant).
* Returns GTF_reading | GTF_writing (0 if remote does not use it anymore).
*/
int xengnt_status(grant_ref_t);
