mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-11-28 13:22:48 +00:00
3a6d1fcf9c
Log:
- merge in latest xenbus from dfr's xenhvm
- fix race condition in xs_read_reply by converting tsleep to mtx_sleep
Log:
unmask evtchn in bind_{virq, ipi}_to_irq
Log:
- remove code for handling case of not being able to sleep
- eliminate tsleep - make sleeps atomic
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
/******************************************************************************
|
|
* evtchn.h
|
|
*
|
|
* Communication via Xen event channels.
|
|
* Also definitions for the device that demuxes notifications to userspace.
|
|
*
|
|
* Copyright (c) 2004, K A Fraser
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef __ASM_EVTCHN_H__
|
|
#define __ASM_EVTCHN_H__
|
|
#include <machine/pcpu.h>
|
|
#include <xen/hypervisor.h>
|
|
#include <machine/xen/synch_bitops.h>
|
|
#include <machine/frame.h>
|
|
|
|
/*
|
|
* LOW-LEVEL DEFINITIONS
|
|
*/
|
|
|
|
/*
|
|
* Unlike notify_remote_via_evtchn(), this is safe to use across
|
|
* save/restore. Notifications on a broken connection are silently dropped.
|
|
*/
|
|
void notify_remote_via_irq(int irq);
|
|
|
|
|
|
/* Entry point for notifications into Linux subsystems. */
|
|
void evtchn_do_upcall(struct trapframe *frame);
|
|
|
|
/* Entry point for notifications into the userland character device. */
|
|
void evtchn_device_upcall(int port);
|
|
|
|
void mask_evtchn(int port);
|
|
|
|
void unmask_evtchn(int port);
|
|
|
|
#ifdef SMP
|
|
void rebind_evtchn_to_cpu(int port, unsigned int cpu);
|
|
#else
|
|
#define rebind_evtchn_to_cpu(port, cpu) ((void)0)
|
|
#endif
|
|
|
|
static inline
|
|
int test_and_set_evtchn_mask(int port)
|
|
{
|
|
shared_info_t *s = HYPERVISOR_shared_info;
|
|
return synch_test_and_set_bit(port, s->evtchn_mask);
|
|
}
|
|
|
|
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_remote_via_evtchn(int port)
|
|
{
|
|
struct evtchn_send send = { .port = port };
|
|
(void)HYPERVISOR_event_channel_op(EVTCHNOP_send, &send);
|
|
}
|
|
|
|
/*
|
|
* Use these to access the event channel underlying the IRQ handle returned
|
|
* by bind_*_to_irqhandler().
|
|
*/
|
|
int irq_to_evtchn_port(int irq);
|
|
|
|
void ipi_pcpu(unsigned int cpu, int vector);
|
|
|
|
/*
|
|
* CHARACTER-DEVICE DEFINITIONS
|
|
*/
|
|
|
|
#define PORT_NORMAL 0x0000
|
|
#define PORT_EXCEPTION 0x8000
|
|
#define PORTIDX_MASK 0x7fff
|
|
|
|
/* /dev/xen/evtchn resides at device number major=10, minor=200 */
|
|
#define EVTCHN_MINOR 200
|
|
|
|
/* /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 the 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__ */
|