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/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
****************************************************************************
* (C) 2003 - Rolf Neugebauer - Intel Research Cambridge
****************************************************************************
*
* File: events.c
* Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
* Changes:
*
* Date: Jul 2003
*
* Environment: Xen Minimal OS
* Description: Deal with events
*
****************************************************************************
* $Id: c-insert.c,v 1.7 2002/11/08 16:04:34 rn Exp $
****************************************************************************
*/
#include <os.h>
#include <hypervisor.h>
#include <events.h>
#include <lib.h>
static ev_action_t ev_actions[NR_EVS];
void default_handler(int ev, struct pt_regs *regs);
/*
* demux events to different handlers
*/
asmlinkage unsigned int do_event(int ev, struct pt_regs *regs)
{
ev_action_t *action;
if (ev >= NR_EVS) {
printk("Large event number %d\n", ev);
return 0;
}
action = &ev_actions[ev];
action->count++;
ack_hypervisor_event(ev);
if (!action->handler)
goto out;
if (action->status & EVS_DISABLED)
goto out;
/* call the handler */
action->handler(ev, regs);
out:
return 1;
}
/*
* add a handler
*/
unsigned int add_ev_action( int ev, void (*handler)(int, struct pt_regs *) )
{
if (ev_actions[ev].handler) {
printk ("event[%d] already handled by %p", ev, ev_actions[ev].handler);
return 0;
}
ev_actions[ev].handler = handler;
return 1;
}
unsigned int enable_ev_action( int ev )
{
if (!ev_actions[ev].handler) {
printk ("enable event[%d], no handler installed", ev);
return 0;
}
ev_actions[ev].status &= ~EVS_DISABLED;
return 1;
}
unsigned int disable_ev_action( int ev )
{
ev_actions[ev].status |= EVS_DISABLED;
return 1;
}
/*
* 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(int ev, struct pt_regs *regs) {
printk("X[%d] ", ev);
}
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