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      1 /******************************************************************************
      2  * arch-x86_64.h
      3  *
      4  * Guest OS interface to x86 64-bit Xen.
      5  *
      6  * Permission is hereby granted, free of charge, to any person obtaining a copy
      7  * of this software and associated documentation files (the "Software"), to
      8  * deal in the Software without restriction, including without limitation the
      9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     10  * sell copies of the Software, and to permit persons to whom the Software is
     11  * furnished to do so, subject to the following conditions:
     12  *
     13  * The above copyright notice and this permission notice shall be included in
     14  * all copies or substantial portions of the Software.
     15  *
     16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     22  * DEALINGS IN THE SOFTWARE.
     23  *
     24  * Copyright (c) 2004-2006, K A Fraser
     25  */
     26 
     27 #include "arch-x86/xen.h"
     28 
     29 /*
     30  * ` enum neg_errnoval
     31  * ` HYPERVISOR_set_callbacks(unsigned long event_selector,
     32  * `                          unsigned long event_address,
     33  * `                          unsigned long failsafe_selector,
     34  * `                          unsigned long failsafe_address);
     35  * `
     36  * Register for callbacks on events.  When an event (from an event
     37  * channel) occurs, event_address is used as the value of eip.
     38  *
     39  * A similar callback occurs if the segment selectors are invalid.
     40  * failsafe_address is used as the value of eip.
     41  *
     42  * On x86_64, event_selector and failsafe_selector are ignored (???).
     43  */
     44