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/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
****************************************************************************
* (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
* (C) 2005 - Grzegorz Milos - Intel Research Cambridge
****************************************************************************
*
* File: events.c
* Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
* Changes: Grzegorz Milos (gm281@cam.ac.uk)
*
* Date: Jul 2003, changes Jun 2005
*
* Environment: Xen Minimal OS
* Description: Deals with events recieved on event channels
*
****************************************************************************
*/
#include <os.h>
#include <hypervisor.h>
#include <events.h>
#include <lib.h>
#include <xen/event_channel.h>
static ev_action_t ev_actions[NR_EVS];
void default_handler(u32 port, struct pt_regs *regs);
/*
* Demux events to different handlers.
*/
int do_event(u32 port, struct pt_regs *regs)
{
ev_action_t *action;
if (port >= NR_EVS) {
printk("Port number too large: %d\n", port);
return 0;
}
action = &ev_actions[port];
action->count++;
if (!action->handler)
goto out;
if (action->status & EVS_DISABLED)
goto out;
/* call the handler */
action->handler(port, regs);
clear_evtchn(port);
out:
return 1;
}
int bind_virq( u32 virq, void (*handler)(int, struct pt_regs *) )
{
evtchn_op_t op;
int ret = 0;
u32 port;
/* Try to bind the virq to a port */
op.cmd = EVTCHNOP_bind_virq;
op.u.bind_virq.virq = virq;
if ( HYPERVISOR_event_channel_op(&op) != 0 )
{
ret = 1;
printk("Failed to bind virtual IRQ %d\n", virq);
goto out;
}
port = op.u.bind_virq.port;
if(ev_actions[port].handler)
printk("WARN: Handler for port %d already registered, replacing\n",
port);
ev_actions[port].handler = handler;
ev_actions[port].status &= ~EVS_DISABLED;
/* Finally unmask the port */
unmask_evtchn(port);
out:
return ret;
}
/*
* Initially all events are without a handler and disabled
*/
void init_events(void)
{
int i;
/* inintialise event handler */
for ( i = 0; i < NR_EVS; i++ )
{
ev_actions[i].status = EVS_DISABLED;
ev_actions[i].handler = NULL;
}
}
void default_handler(u32 port, struct pt_regs *regs) {
printk("[Port %d] - event received\n", port);
}
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