mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 10:40:03 +01:00
kaf24@firebug.cl.cam.ac.uk
c7b965a01c
From: Grzegorz Milos <gm281@cam.ac.uk> Signed-off-by: Keir Fraser <keir@xensource.com>
128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/* -*- 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 <mm.h>
|
|
#include <hypervisor.h>
|
|
#include <events.h>
|
|
#include <lib.h>
|
|
|
|
|
|
static ev_action_t ev_actions[NR_EVS];
|
|
void default_handler(int 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_evtchn( u32 port, void (*handler)(int, struct pt_regs *) )
|
|
{
|
|
if(ev_actions[port].handler != default_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);
|
|
|
|
return port;
|
|
}
|
|
|
|
void unbind_evtchn( u32 port )
|
|
{
|
|
if (ev_actions[port].handler == default_handler)
|
|
printk("WARN: No handler for port %d when unbinding\n", port);
|
|
ev_actions[port].handler = default_handler;
|
|
ev_actions[port].status |= EVS_DISABLED;
|
|
}
|
|
|
|
int bind_virq( u32 virq, void (*handler)(int, struct pt_regs *) )
|
|
{
|
|
evtchn_op_t op;
|
|
int ret = 0;
|
|
|
|
/* Try to bind the virq to a port */
|
|
op.cmd = EVTCHNOP_bind_virq;
|
|
op.u.bind_virq.virq = virq;
|
|
op.u.bind_virq.vcpu = smp_processor_id();
|
|
|
|
if ( HYPERVISOR_event_channel_op(&op) != 0 )
|
|
{
|
|
ret = 1;
|
|
printk("Failed to bind virtual IRQ %d\n", virq);
|
|
goto out;
|
|
}
|
|
bind_evtchn(op.u.bind_virq.port, handler);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
void unbind_virq( u32 port )
|
|
{
|
|
unbind_evtchn(port);
|
|
}
|
|
|
|
|
|
/*
|
|
* 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 = default_handler;
|
|
}
|
|
}
|
|
|
|
void default_handler(int port, struct pt_regs *regs) {
|
|
printk("[Port %d] - event received\n", port);
|
|
}
|