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/******************************************************************************
* evtchn.h
*
* Data structures and definitions private to the FreeBSD implementation
* of the Xen event channel API.
*
* Copyright (c) 2004, K A Fraser
* Copyright (c) 2012, Spectra Logic Corporation
* Copyright © 2022, Elliott Mitchell
*
* This file may be distributed separately from the Linux kernel, or
* incorporated into other software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (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.
*
* $FreeBSD$
*/
#ifndef __XEN_EVTCHN_EVTCHNVAR_H__
#define __XEN_EVTCHN_EVTCHNVAR_H__
#include <xen/hypervisor.h>
#include <contrib/xen/event_channel.h>
enum evtchn_type {
EVTCHN_TYPE_UNBOUND,
EVTCHN_TYPE_VIRQ,
EVTCHN_TYPE_IPI,
EVTCHN_TYPE_PORT,
EVTCHN_TYPE_COUNT
};
/** Submit a port notification for delivery to a userland evtchn consumer */
void evtchn_device_upcall(evtchn_port_t port);
/* Macros for accessing event channel values */
#define EVTCHN_PTR(type, port) \
(HYPERVISOR_shared_info->evtchn_##type + ((port) / __LONG_BIT))
#define EVTCHN_BIT(port) ((port) & (__LONG_BIT - 1))
#define EVTCHN_MASK(port) (1UL << EVTCHN_BIT(port))
/**
* Disable signal delivery for an event channel port, returning its
* previous mask state.
*
* \param port The event channel port to query and mask.
*
* \returns 1 if event delivery was previously disabled. Otherwise 0.
*/
static inline int
evtchn_test_and_set_mask(evtchn_port_t port)
{
return (atomic_testandset_long(EVTCHN_PTR(mask, port),
EVTCHN_BIT(port)));
}
/**
* Clear any pending event for the given event channel port.
*
* \param port The event channel port to clear.
*/
static inline void
evtchn_clear_port(evtchn_port_t port)
{
atomic_clear_long(EVTCHN_PTR(pending, port), EVTCHN_MASK(port));
}
/**
* Disable signal delivery for an event channel port.
*
* \param port The event channel port to mask.
*/
static inline void
evtchn_mask_port(evtchn_port_t port)
{
atomic_set_long(EVTCHN_PTR(mask, port), EVTCHN_MASK(port));
}
/**
* Enable signal delivery for an event channel port.
*
* \param port The event channel port to enable.
*/
static inline void
evtchn_unmask_port(evtchn_port_t port)
{
evtchn_unmask_t op = { .port = port };
HYPERVISOR_event_channel_op(EVTCHNOP_unmask, &op);
}
#endif /* __XEN_EVTCHN_EVTCHNVAR_H__ */
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