sys/arch/xen/include/xen3-public/xencomm.h

   1 /* $NetBSD: $ */
   2 /*
   3  * Permission is hereby granted, free of charge, to any person obtaining a copy
   4  * of this software and associated documentation files (the "Software"), to
   5  * deal in the Software without restriction, including without limitation the
   6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
   7  * sell copies of the Software, and to permit persons to whom the Software is
   8  * furnished to do so, subject to the following conditions:
   9  *
  10  * The above copyright notice and this permission notice shall be included in
  11  * all copies or substantial portions of the Software.
  12  *
  13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  19  * DEALINGS IN THE SOFTWARE.
  20  *
  21  * Copyright (C) IBM Corp. 2006
  22  */
  23
  24 #ifndef _XEN_XENCOMM_H_
  25 #define _XEN_XENCOMM_H_
  26
  27 /* A xencomm descriptor is a scatter/gather list containing physical
  28  * addresses corresponding to a virtually contiguous memory area. The
  29  * hypervisor translates these physical addresses to machine addresses to copy
  30  * to and from the virtually contiguous area.
  31  */
  32
  33 #define XENCOMM_MAGIC 0x58434F4D /* 'XCOM' */
  34 #define XENCOMM_INVALID (~0UL)
  35
  36 struct xencomm_desc {
  37     uint32_t magic;
  38     uint32_t nr_addrs; /* the number of entries in address[] */
  39     uint64_t address[0];
  40 };
  41
  42 #endif /* _XEN_XENCOMM_H_ */