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      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 
     35 struct 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