static int __init xen_hvc_init(void)
{
struct hvc_struct *hp;
struct hv_ops *ops;
if (!xen_pv_domain())
return -ENODEV;
if (xen_initial_domain()) {
ops = &dom0_hvc_ops;
xencons_irq = bind_virq_to_irq(VIRQ_CONSOLE, 0);
} else {
if (!xen_start_info->console.domU.evtchn)
return -ENODEV;
ops = &domU_hvc_ops;
xencons_irq = bind_evtchn_to_irq(xen_start_info->console.domU.evtchn);
}
if (xencons_irq < 0)
xencons_irq = 0; /* NO_IRQ */
else
irq_set_noprobe(xencons_irq);
hp = hvc_alloc(HVC_COOKIE, xencons_irq, ops, 256);
if (IS_ERR(hp))
return PTR_ERR(hp);
hvc = hp;
console_pfn = mfn_to_pfn(xen_start_info->console.domU.mfn);
return 0;
}
int bind_virq_to_irqhandler(
unsigned int virq,
unsigned int cpu,
irqreturn_t (*handler)(int, void *, struct pt_regs *),
unsigned long irqflags,
const char *devname,
void *dev_id)
{
unsigned int irq;
int retval;
irq = bind_virq_to_irq(virq, cpu);
retval = request_irq(irq, handler, irqflags, devname, dev_id);
if (retval != 0) {
unbind_from_irq(irq);
return retval;
}
return irq;
}
int
bind_virq_to_irqhandler(unsigned int virq, unsigned int cpu,
const char *devname, driver_filter_t filter, driver_intr_t handler,
void *arg, unsigned long irqflags, unsigned int *irqp)
{
unsigned int irq;
int error;
irq = bind_virq_to_irq(virq, cpu);
intr_register_source(&xp->xp_pins[irq].xp_intsrc);
error = intr_add_handler(devname, irq, filter, handler,
arg, irqflags, &xp->xp_pins[irq].xp_cookie);
if (error) {
unbind_from_irq(irq);
return (error);
}
if (irqp)
*irqp = irq;
return (0);
}
