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/******************************************************************************
* evtchn.h
*
* Communication via Xen event channels.
* Also definitions for the device that demuxes notifications to userspace.
*
* Copyright (c) 2004, K A Fraser
*
* 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.
*/
#ifndef __ASM_EVTCHN_H__
#define __ASM_EVTCHN_H__
#include <linux/config.h>
#include <asm-xen/hypervisor.h>
#include <asm/ptrace.h>
#include <asm/synch_bitops.h>
#include <asm/hypervisor-ifs/event_channel.h>
/*
* LOW-LEVEL DEFINITIONS
*/
/* Force a proper event-channel callback from Xen. */
void force_evtchn_callback(void);
/* Entry point for notifications into Linux subsystems. */
void evtchn_do_upcall(struct pt_regs *regs);
/* Entry point for notifications into the userland character device. */
void evtchn_device_upcall(int port);
static inline void mask_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_set_bit(port, &s->evtchn_mask[0]);
}
static inline void unmask_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_clear_bit(port, &s->evtchn_mask[0]);
/*
* The following is basically the equivalent of 'hw_resend_irq'. Just like
* a real IO-APIC we 'lose the interrupt edge' if the channel is masked.
*/
if ( synch_test_bit (port, &s->evtchn_pending[0]) &&
!synch_test_and_set_bit(port>>5, &s->evtchn_pending_sel) )
{
s->vcpu_data[0].evtchn_upcall_pending = 1;
if ( !s->vcpu_data[0].evtchn_upcall_mask )
force_evtchn_callback();
}
}
static inline void clear_evtchn(int port)
{
shared_info_t *s = HYPERVISOR_shared_info;
synch_clear_bit(port, &s->evtchn_pending[0]);
}
static inline void notify_via_evtchn(int port)
{
evtchn_op_t op;
op.cmd = EVTCHNOP_send;
op.u.send.local_port = port;
(void)HYPERVISOR_event_channel_op(&op);
}
/*
* CHARACTER-DEVICE DEFINITIONS
*/
/* /dev/xen/evtchn resides at device number major=10, minor=201 */
#define EVTCHN_MINOR 201
/* /dev/xen/evtchn ioctls: */
/* EVTCHN_RESET: Clear and reinit the event buffer. Clear error condition. */
#define EVTCHN_RESET _IO('E', 1)
/* EVTCHN_BIND: Bind to teh specified event-channel port. */
#define EVTCHN_BIND _IO('E', 2)
/* EVTCHN_UNBIND: Unbind from the specified event-channel port. */
#define EVTCHN_UNBIND _IO('E', 3)
#endif /* __ASM_EVTCHN_H__ */
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