83 lines
2.0 KiB
C
83 lines
2.0 KiB
C
/******************************************************************************
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* evtchn.h
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*
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* Communication via Xen event channels.
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* Also definitions for the device that demuxes notifications to userspace.
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*
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* Copyright (c) 2004, K A Fraser
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*
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* $FreeBSD$
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*/
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#ifndef __ASM_EVTCHN_H__
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#define __ASM_EVTCHN_H__
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#include <machine/pcpu.h>
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#include <machine/xen/hypervisor.h>
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#include <machine/xen/synch_bitops.h>
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#include <machine/frame.h>
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/*
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* LOW-LEVEL DEFINITIONS
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*/
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/*
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* Unlike notify_remote_via_evtchn(), this is safe to use across
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* save/restore. Notifications on a broken connection are silently dropped.
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*/
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void notify_remote_via_irq(int irq);
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/* Entry point for notifications into Linux subsystems. */
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void evtchn_do_upcall(struct trapframe *frame);
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/* Entry point for notifications into the userland character device. */
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void evtchn_device_upcall(int port);
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void mask_evtchn(int port);
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void unmask_evtchn(int port);
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static inline void
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clear_evtchn(int port)
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{
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shared_info_t *s = HYPERVISOR_shared_info;
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synch_clear_bit(port, &s->evtchn_pending[0]);
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}
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static inline void
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notify_remote_via_evtchn(int port)
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{
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struct evtchn_send send = { .port = port };
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(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
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}
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/*
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* Use these to access the event channel underlying the IRQ handle returned
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* by bind_*_to_irqhandler().
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*/
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int irq_to_evtchn_port(int irq);
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/*
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* CHARACTER-DEVICE DEFINITIONS
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*/
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#define PORT_NORMAL 0x0000
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#define PORT_EXCEPTION 0x8000
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#define PORTIDX_MASK 0x7fff
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/* /dev/xen/evtchn resides at device number major=10, minor=200 */
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#define EVTCHN_MINOR 200
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/* /dev/xen/evtchn ioctls: */
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/* EVTCHN_RESET: Clear and reinit the event buffer. Clear error condition. */
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#define EVTCHN_RESET _IO('E', 1)
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/* EVTCHN_BIND: Bind to the specified event-channel port. */
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#define EVTCHN_BIND _IO('E', 2)
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/* EVTCHN_UNBIND: Unbind from the specified event-channel port. */
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#define EVTCHN_UNBIND _IO('E', 3)
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#endif /* __ASM_EVTCHN_H__ */
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