The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/xen/interface/callback.h

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    1 /******************************************************************************
    2  * callback.h
    3  *
    4  * Register guest OS callbacks with 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) 2006, Ian Campbell
   25  */
   26 
   27 #ifndef __XEN_PUBLIC_CALLBACK_H__
   28 #define __XEN_PUBLIC_CALLBACK_H__
   29 
   30 #include "xen.h"
   31 
   32 /*
   33  * Prototype for this hypercall is:
   34  *   long callback_op(int cmd, void *extra_args)
   35  * @cmd        == CALLBACKOP_??? (callback operation).
   36  * @extra_args == Operation-specific extra arguments (NULL if none).
   37  */
   38 
   39 /* x86: Callback for event delivery. */
   40 #define CALLBACKTYPE_event                 0
   41 
   42 /* x86: Failsafe callback when guest state cannot be restored by Xen. */
   43 #define CALLBACKTYPE_failsafe              1
   44 
   45 /* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
   46 #define CALLBACKTYPE_syscall               2
   47 
   48 /*
   49  * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
   50  *     feature is enabled. Do not use this callback type in new code.
   51  */
   52 #define CALLBACKTYPE_sysenter_deprecated   3
   53 
   54 /* x86: Callback for NMI delivery. */
   55 #define CALLBACKTYPE_nmi                   4
   56 
   57 /*
   58  * x86: sysenter is only available as follows:
   59  * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
   60  * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
   61  *                      ('32-on-32-on-64', '32-on-64-on-64')
   62  *                      [nb. also 64-bit guest applications on Intel CPUs
   63  *                           ('64-on-64-on-64'), but syscall is preferred]
   64  */
   65 #define CALLBACKTYPE_sysenter              5
   66 
   67 /*
   68  * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
   69  *                    ('32-on-32-on-64', '32-on-64-on-64')
   70  */
   71 #define CALLBACKTYPE_syscall32             7
   72 
   73 /*
   74  * Disable event deliver during callback? This flag is ignored for event and
   75  * NMI callbacks: event delivery is unconditionally disabled.
   76  */
   77 #define _CALLBACKF_mask_events             0
   78 #define CALLBACKF_mask_events              (1U << _CALLBACKF_mask_events)
   79 
   80 /*
   81  * Register a callback.
   82  */
   83 #define CALLBACKOP_register                0
   84 struct callback_register {
   85     uint16_t type;
   86     uint16_t flags;
   87     xen_callback_t address;
   88 };
   89 typedef struct callback_register callback_register_t;
   90 DEFINE_XEN_GUEST_HANDLE(callback_register_t);
   91 
   92 /*
   93  * Unregister a callback.
   94  *
   95  * Not all callbacks can be unregistered. -EINVAL will be returned if
   96  * you attempt to unregister such a callback.
   97  */
   98 #define CALLBACKOP_unregister              1
   99 struct callback_unregister {
  100     uint16_t type;
  101     uint16_t _unused;
  102 };
  103 typedef struct callback_unregister callback_unregister_t;
  104 DEFINE_XEN_GUEST_HANDLE(callback_unregister_t);
  105 
  106 #if __XEN_INTERFACE_VERSION__ < 0x00030207
  107 #undef CALLBACKTYPE_sysenter
  108 #define CALLBACKTYPE_sysenter CALLBACKTYPE_sysenter_deprecated
  109 #endif
  110 
  111 #endif /* __XEN_PUBLIC_CALLBACK_H__ */
  112 
  113 /*
  114  * Local variables:
  115  * mode: C
  116  * c-file-style: "BSD"
  117  * c-basic-offset: 4
  118  * tab-width: 4
  119  * indent-tabs-mode: nil
  120  * End:
  121  */

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