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

     /******************************************************************************
      * callback.h
      *
      * Register guest OS callbacks with Xen.
      *
      * Permission is hereby granted, free of charge, to any person obtaining a copy
      * of this software and associated documentation files (the "Software"), to
      * deal in the Software without restriction, including without limitation the
      * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     * sell copies of the Software, and to permit persons to whom the Software is
     * furnished to do so, subject to the following conditions:
     *
     * The above copyright notice and this permission notice shall be included in
     * all copies or substantial portions of the Software.
     *
     * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
     * DEALINGS IN THE SOFTWARE.
     *
     * Copyright (c) 2006, Ian Campbell
     */
    
    #ifndef __XEN_PUBLIC_CALLBACK_H__
    #define __XEN_PUBLIC_CALLBACK_H__
    
    #include "xen.h"
    
    /*
     * Prototype for this hypercall is:
     *   long callback_op(int cmd, void *extra_args)
     * @cmd        == CALLBACKOP_??? (callback operation).
     * @extra_args == Operation-specific extra arguments (NULL if none).
     */
    
    /* x86: Callback for event delivery. */
    #define CALLBACKTYPE_event                 0
    
    /* x86: Failsafe callback when guest state cannot be restored by Xen. */
    #define CALLBACKTYPE_failsafe              1
    
    /* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
    #define CALLBACKTYPE_syscall               2
    
    /*
     * x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
     *     feature is enabled. Do not use this callback type in new code.
     */
    #define CALLBACKTYPE_sysenter_deprecated   3
    
    /* x86: Callback for NMI delivery. */
    #define CALLBACKTYPE_nmi                   4
    
    /*
     * x86: sysenter is only available as follows:
     * - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
     * - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
     *                      ('32-on-32-on-64', '32-on-64-on-64')
     *                      [nb. also 64-bit guest applications on Intel CPUs
     *                           ('64-on-64-on-64'), but syscall is preferred]
     */
    #define CALLBACKTYPE_sysenter              5
    
    /*
     * x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
     *                    ('32-on-32-on-64', '32-on-64-on-64')
     */
    #define CALLBACKTYPE_syscall32             7
    
    /*
     * Disable event deliver during callback? This flag is ignored for event and
     * NMI callbacks: event delivery is unconditionally disabled.
     */
    #define _CALLBACKF_mask_events             0
    #define CALLBACKF_mask_events              (1U << _CALLBACKF_mask_events)
    
    /*
     * Register a callback.
     */
    #define CALLBACKOP_register                0
    struct callback_register {
        uint16_t type;
        uint16_t flags;
        xen_callback_t address;
    };
    typedef struct callback_register callback_register_t;
    DEFINE_XEN_GUEST_HANDLE(callback_register_t);
    
    /*
     * Unregister a callback.
     *
     * Not all callbacks can be unregistered. -EINVAL will be returned if
     * you attempt to unregister such a callback.
     */
    #define CALLBACKOP_unregister              1
    struct callback_unregister {
       uint16_t type;
       uint16_t _unused;
   };
   typedef struct callback_unregister callback_unregister_t;
   DEFINE_XEN_GUEST_HANDLE(callback_unregister_t);
   
   #if __XEN_INTERFACE_VERSION__ < 0x00030207
   #undef CALLBACKTYPE_sysenter
   #define CALLBACKTYPE_sysenter CALLBACKTYPE_sysenter_deprecated
   #endif
   
   #endif /* __XEN_PUBLIC_CALLBACK_H__ */
   
   /*
    * Local variables:
    * mode: C
    * c-file-style: "BSD"
    * c-basic-offset: 4
    * tab-width: 4
    * indent-tabs-mode: nil
    * End:
    */

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