FreeBSD/Linux Kernel Cross Reference
sys/xen/evtchn/evtchnvar.h

     /******************************************************************************
      * 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
      *
     * 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);
    
    /**
     * 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)
    {
            shared_info_t *s = HYPERVISOR_shared_info;
            return synch_test_and_set_bit(port, s->evtchn_mask);
    }
    
    /**
     * 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)
    {
            shared_info_t *s = HYPERVISOR_shared_info;
            synch_clear_bit(port, &s->evtchn_pending[0]);
    }
    
    /**
     * 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)
    {
            shared_info_t *s = HYPERVISOR_shared_info;
    
            synch_set_bit(port, &s->evtchn_mask[0]);
    }
    
    /**
     * 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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