mirror of https://github.com/acidanthera/audk.git
119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/******************************************************************************
|
|
* event_channel.h
|
|
*
|
|
* Event channels between domains.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to
|
|
* deal in the Software without restriction, including without limitation the
|
|
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
* sell copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
* DEALINGS IN THE SOFTWARE.
|
|
*
|
|
* Copyright (c) 2003-2004, K A Fraser.
|
|
*/
|
|
|
|
#ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__
|
|
#define __XEN_PUBLIC_EVENT_CHANNEL_H__
|
|
|
|
#include "xen.h"
|
|
|
|
/*
|
|
* `incontents 150 evtchn Event Channels
|
|
*
|
|
* Event channels are the basic primitive provided by Xen for event
|
|
* notifications. An event is the Xen equivalent of a hardware
|
|
* interrupt. They essentially store one bit of information, the event
|
|
* of interest is signalled by transitioning this bit from 0 to 1.
|
|
*
|
|
* Notifications are received by a guest via an upcall from Xen,
|
|
* indicating when an event arrives (setting the bit). Further
|
|
* notifications are masked until the bit is cleared again (therefore,
|
|
* guests must check the value of the bit after re-enabling event
|
|
* delivery to ensure no missed notifications).
|
|
*
|
|
* Event notifications can be masked by setting a flag; this is
|
|
* equivalent to disabling interrupts and can be used to ensure
|
|
* atomicity of certain operations in the guest kernel.
|
|
*
|
|
* Event channels are represented by the evtchn_* fields in
|
|
* struct shared_info and struct vcpu_info.
|
|
*/
|
|
|
|
/*
|
|
* ` enum neg_errnoval
|
|
* ` HYPERVISOR_event_channel_op(enum event_channel_op cmd, VOID *args)
|
|
* `
|
|
* @cmd == EVTCHNOP_* (event-channel operation).
|
|
* @args == struct evtchn_* Operation-specific extra arguments (NULL if none).
|
|
*/
|
|
|
|
/* ` enum event_channel_op { // EVTCHNOP_* => struct evtchn_* */
|
|
#define EVTCHNOP_close 3
|
|
#define EVTCHNOP_send 4
|
|
#define EVTCHNOP_alloc_unbound 6
|
|
/* ` } */
|
|
|
|
typedef UINT32 evtchn_port_t;
|
|
DEFINE_XEN_GUEST_HANDLE(evtchn_port_t);
|
|
|
|
/*
|
|
* EVTCHNOP_alloc_unbound: Allocate a port in domain <dom> and mark as
|
|
* accepting interdomain bindings from domain <remote_dom>. A fresh port
|
|
* is allocated in <dom> and returned as <port>.
|
|
* NOTES:
|
|
* 1. If the caller is unprivileged then <dom> must be DOMID_SELF.
|
|
* 2. <rdom> may be DOMID_SELF, allowing loopback connections.
|
|
*/
|
|
struct evtchn_alloc_unbound {
|
|
/* IN parameters */
|
|
domid_t dom, remote_dom;
|
|
/* OUT parameters */
|
|
evtchn_port_t port;
|
|
};
|
|
typedef struct evtchn_alloc_unbound evtchn_alloc_unbound_t;
|
|
|
|
/*
|
|
* EVTCHNOP_close: Close a local event channel <port>. If the channel is
|
|
* interdomain then the remote end is placed in the unbound state
|
|
* (EVTCHNSTAT_unbound), awaiting a new connection.
|
|
*/
|
|
struct evtchn_close {
|
|
/* IN parameters. */
|
|
evtchn_port_t port;
|
|
};
|
|
typedef struct evtchn_close evtchn_close_t;
|
|
|
|
/*
|
|
* EVTCHNOP_send: Send an event to the remote end of the channel whose local
|
|
* endpoint is <port>.
|
|
*/
|
|
struct evtchn_send {
|
|
/* IN parameters. */
|
|
evtchn_port_t port;
|
|
};
|
|
typedef struct evtchn_send evtchn_send_t;
|
|
|
|
#endif /* __XEN_PUBLIC_EVENT_CHANNEL_H__ */
|
|
|
|
/*
|
|
* Local variables:
|
|
* mode: C
|
|
* c-file-style: "BSD"
|
|
* c-basic-offset: 4
|
|
* tab-width: 4
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*/
|