sys/arch/xen/include/xen_shm.h

   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  *
  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 #include <machine/param.h>
  30
  31 #define XENSHM_MAX_PAGES_PER_REQUEST (MAXPHYS >> PAGE_SHIFT)
  32
  33 /*
  34  * Helper routines for the backend drivers. This implement the necessary
  35  * functions to map a bunch of pages from foreign domains in our kernel VM
  36  * space, do I/O to it, and unmap it.
  37  */
  38
  39 int  xen_shm_map(int, int, grant_ref_t *, vaddr_t *, grant_handle_t *, int);
  40 void xen_shm_unmap(vaddr_t, int, grant_handle_t *);
  41 int xen_shm_callback(int (*)(void *), void *);
  42
  43 /* flags for xen_shm_map() */
  44 #define XSHM_CALLBACK 0x01      /* called from a callback */
  45 #define XSHM_RO 0x02            /* map the guest's memory read-only */