/* SPDX-License-Identifier: MIT *//****************************************************************************** * callback.h * * Register guest OS callbacks with Xen. * * Copyright (c) 2006, Ian Campbell */ #ifndef __XEN_PUBLIC_CALLBACK_H__#define __XEN_PUBLIC_CALLBACK_H__ #include <xen/interface/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                0struct callback_register {	uint16_t type;	uint16_t flags;	xen_callback_t address;}; /* * Unregister a callback. * * Not all callbacks can be unregistered. -EINVAL will be returned if * you attempt to unregister such a callback. */#define CALLBACKOP_unregister              1struct callback_unregister {    uint16_t type;    uint16_t _unused;}; #endif /* __XEN_PUBLIC_CALLBACK_H__ */