86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/* SPDX-License-Identifier: MIT */
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/******************************************************************************
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* callback.h
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*
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* Register guest OS callbacks with Xen.
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*
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* Copyright (c) 2006, Ian Campbell
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*/
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#ifndef __XEN_PUBLIC_CALLBACK_H__
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#define __XEN_PUBLIC_CALLBACK_H__
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#include <xen/interface/xen.h>
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/*
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* Prototype for this hypercall is:
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* long callback_op(int cmd, void *extra_args)
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* @cmd == CALLBACKOP_??? (callback operation).
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* @extra_args == Operation-specific extra arguments (NULL if none).
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*/
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/* x86: Callback for event delivery. */
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#define CALLBACKTYPE_event 0
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/* x86: Failsafe callback when guest state cannot be restored by Xen. */
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#define CALLBACKTYPE_failsafe 1
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/* x86/64 hypervisor: Syscall by 64-bit guest app ('64-on-64-on-64'). */
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#define CALLBACKTYPE_syscall 2
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/*
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* x86/32 hypervisor: Only available on x86/32 when supervisor_mode_kernel
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* feature is enabled. Do not use this callback type in new code.
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*/
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#define CALLBACKTYPE_sysenter_deprecated 3
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/* x86: Callback for NMI delivery. */
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#define CALLBACKTYPE_nmi 4
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/*
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* x86: sysenter is only available as follows:
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* - 32-bit hypervisor: with the supervisor_mode_kernel feature enabled
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* - 64-bit hypervisor: 32-bit guest applications on Intel CPUs
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* ('32-on-32-on-64', '32-on-64-on-64')
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* [nb. also 64-bit guest applications on Intel CPUs
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* ('64-on-64-on-64'), but syscall is preferred]
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*/
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#define CALLBACKTYPE_sysenter 5
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/*
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* x86/64 hypervisor: Syscall by 32-bit guest app on AMD CPUs
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* ('32-on-32-on-64', '32-on-64-on-64')
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*/
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#define CALLBACKTYPE_syscall32 7
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/*
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* Disable event deliver during callback? This flag is ignored for event and
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* NMI callbacks: event delivery is unconditionally disabled.
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*/
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#define _CALLBACKF_mask_events 0
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#define CALLBACKF_mask_events (1U << _CALLBACKF_mask_events)
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/*
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* Register a callback.
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*/
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#define CALLBACKOP_register 0
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struct callback_register {
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uint16_t type;
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uint16_t flags;
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xen_callback_t address;
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};
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/*
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* Unregister a callback.
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*
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* Not all callbacks can be unregistered. -EINVAL will be returned if
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* you attempt to unregister such a callback.
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*/
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#define CALLBACKOP_unregister 1
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struct callback_unregister {
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uint16_t type;
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uint16_t _unused;
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};
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#endif /* __XEN_PUBLIC_CALLBACK_H__ */
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