1/* $NetBSD: xencomm.h,v 1.1.1.1 2011/12/07 13:15:46 cegger Exp $ */
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
36struct 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_ */
43