sys/arch/xen/include/granttables.h

   1 /* $NetBSD: granttables.h,v 1.6 2008/10/30 09:24:37 cegger 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  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  */
  26
  27 /* Interface to the Xen Grant tables */
  28 #include <xen/xen3-public/xen.h>
  29 #include <xen/xen3-public/grant_table.h>
  30
  31 void xengnt_init(void);
  32
  33 /*
  34  * grant access to a remote domain. Returns a handle on the allocated grant
  35  * entry in table in grant_ref_t *.
  36  */
  37 int xengnt_grant_access(domid_t, paddr_t, int, grant_ref_t *);
  38
  39 /*
  40  * Revoke access. Caller is responsible to ensure that the grant entry is
  41  * not referenced any more.
  42  */
  43 void xengnt_revoke_access(grant_ref_t);
  44
  45 /* allow a page transfer from a remote domain */
  46 int xengnt_grant_transfer(domid_t, grant_ref_t *);
  47
  48 /* end transfer, return the new page address or 0 */
  49 paddr_t xengnt_revoke_transfer(grant_ref_t);
  50
  51 /*
  52  * Query grant status (i.e. if remote has a valid mapping to this grant).
  53  * Returns GTF_reading | GTF_writing (0 if remote does not use it anymore).
  54  */
  55 int xengnt_status(grant_ref_t);