callback.h

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/*
 * Xen public PV callback interface
 */

#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 xen_callback_register {
    uint16_t type;
    uint16_t flags;
    xen_callback_t address;
};
typedef struct xen_callback_register xen_callback_register_t;

#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:
 */