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      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