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