The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/xencomm.h

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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_ */

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