265 lines
8.7 KiB
C
265 lines
8.7 KiB
C
/******************************************************************************
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* event_channel.h
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*
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* Event channels between domains.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*
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* Copyright (c) 2003-2004, K A Fraser.
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*/
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#ifndef __XEN_PUBLIC_EVENT_CHANNEL_H__
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#define __XEN_PUBLIC_EVENT_CHANNEL_H__
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/*
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* Prototype for this hypercall is:
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* int event_channel_op(int cmd, void *args)
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* @cmd == EVTCHNOP_??? (event-channel operation).
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* @args == Operation-specific extra arguments (NULL if none).
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*/
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typedef uint32_t evtchn_port_t;
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DEFINE_XEN_GUEST_HANDLE(evtchn_port_t);
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/*
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* EVTCHNOP_alloc_unbound: Allocate a port in domain <dom> and mark as
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* accepting interdomain bindings from domain <remote_dom>. A fresh port
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* is allocated in <dom> and returned as <port>.
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* NOTES:
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* 1. If the caller is unprivileged then <dom> must be DOMID_SELF.
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* 2. <rdom> may be DOMID_SELF, allowing loopback connections.
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*/
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#define EVTCHNOP_alloc_unbound 6
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struct evtchn_alloc_unbound {
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/* IN parameters */
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domid_t dom, remote_dom;
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/* OUT parameters */
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evtchn_port_t port;
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};
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typedef struct evtchn_alloc_unbound evtchn_alloc_unbound_t;
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/*
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* EVTCHNOP_bind_interdomain: Construct an interdomain event channel between
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* the calling domain and <remote_dom>. <remote_dom,remote_port> must identify
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* a port that is unbound and marked as accepting bindings from the calling
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* domain. A fresh port is allocated in the calling domain and returned as
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* <local_port>.
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* NOTES:
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* 2. <remote_dom> may be DOMID_SELF, allowing loopback connections.
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*/
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#define EVTCHNOP_bind_interdomain 0
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struct evtchn_bind_interdomain {
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/* IN parameters. */
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domid_t remote_dom;
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evtchn_port_t remote_port;
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/* OUT parameters. */
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evtchn_port_t local_port;
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};
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typedef struct evtchn_bind_interdomain evtchn_bind_interdomain_t;
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/*
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* EVTCHNOP_bind_virq: Bind a local event channel to VIRQ <irq> on specified
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* vcpu.
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* NOTES:
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* 1. Virtual IRQs are classified as per-vcpu or global. See the VIRQ list
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* in xen.h for the classification of each VIRQ.
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* 2. Global VIRQs must be allocated on VCPU0 but can subsequently be
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* re-bound via EVTCHNOP_bind_vcpu.
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* 3. Per-vcpu VIRQs may be bound to at most one event channel per vcpu.
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* The allocated event channel is bound to the specified vcpu and the
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* binding cannot be changed.
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*/
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#define EVTCHNOP_bind_virq 1
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struct evtchn_bind_virq {
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/* IN parameters. */
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uint32_t virq;
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uint32_t vcpu;
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/* OUT parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_bind_virq evtchn_bind_virq_t;
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/*
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* EVTCHNOP_bind_pirq: Bind a local event channel to PIRQ <irq>.
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* NOTES:
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* 1. A physical IRQ may be bound to at most one event channel per domain.
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* 2. Only a sufficiently-privileged domain may bind to a physical IRQ.
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*/
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#define EVTCHNOP_bind_pirq 2
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struct evtchn_bind_pirq {
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/* IN parameters. */
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uint32_t pirq;
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#define BIND_PIRQ__WILL_SHARE 1
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uint32_t flags; /* BIND_PIRQ__* */
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/* OUT parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_bind_pirq evtchn_bind_pirq_t;
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/*
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* EVTCHNOP_bind_ipi: Bind a local event channel to receive events.
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* NOTES:
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* 1. The allocated event channel is bound to the specified vcpu. The binding
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* may not be changed.
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*/
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#define EVTCHNOP_bind_ipi 7
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struct evtchn_bind_ipi {
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uint32_t vcpu;
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/* OUT parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_bind_ipi evtchn_bind_ipi_t;
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/*
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* EVTCHNOP_close: Close a local event channel <port>. If the channel is
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* interdomain then the remote end is placed in the unbound state
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* (EVTCHNSTAT_unbound), awaiting a new connection.
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*/
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#define EVTCHNOP_close 3
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struct evtchn_close {
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/* IN parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_close evtchn_close_t;
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/*
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* EVTCHNOP_send: Send an event to the remote end of the channel whose local
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* endpoint is <port>.
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*/
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#define EVTCHNOP_send 4
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struct evtchn_send {
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/* IN parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_send evtchn_send_t;
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/*
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* EVTCHNOP_status: Get the current status of the communication channel which
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* has an endpoint at <dom, port>.
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* NOTES:
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* 1. <dom> may be specified as DOMID_SELF.
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* 2. Only a sufficiently-privileged domain may obtain the status of an event
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* channel for which <dom> is not DOMID_SELF.
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*/
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#define EVTCHNOP_status 5
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struct evtchn_status {
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/* IN parameters */
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domid_t dom;
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evtchn_port_t port;
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/* OUT parameters */
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#define EVTCHNSTAT_closed 0 /* Channel is not in use. */
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#define EVTCHNSTAT_unbound 1 /* Channel is waiting interdom connection.*/
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#define EVTCHNSTAT_interdomain 2 /* Channel is connected to remote domain. */
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#define EVTCHNSTAT_pirq 3 /* Channel is bound to a phys IRQ line. */
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#define EVTCHNSTAT_virq 4 /* Channel is bound to a virtual IRQ line */
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#define EVTCHNSTAT_ipi 5 /* Channel is bound to a virtual IPI line */
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uint32_t status;
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uint32_t vcpu; /* VCPU to which this channel is bound. */
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union {
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struct {
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domid_t dom;
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} unbound; /* EVTCHNSTAT_unbound */
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struct {
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domid_t dom;
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evtchn_port_t port;
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} interdomain; /* EVTCHNSTAT_interdomain */
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uint32_t pirq; /* EVTCHNSTAT_pirq */
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uint32_t virq; /* EVTCHNSTAT_virq */
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} u;
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};
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typedef struct evtchn_status evtchn_status_t;
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/*
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* EVTCHNOP_bind_vcpu: Specify which vcpu a channel should notify when an
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* event is pending.
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* NOTES:
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* 1. IPI-bound channels always notify the vcpu specified at bind time.
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* This binding cannot be changed.
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* 2. Per-VCPU VIRQ channels always notify the vcpu specified at bind time.
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* This binding cannot be changed.
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* 3. All other channels notify vcpu0 by default. This default is set when
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* the channel is allocated (a port that is freed and subsequently reused
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* has its binding reset to vcpu0).
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*/
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#define EVTCHNOP_bind_vcpu 8
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struct evtchn_bind_vcpu {
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/* IN parameters. */
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evtchn_port_t port;
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uint32_t vcpu;
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};
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typedef struct evtchn_bind_vcpu evtchn_bind_vcpu_t;
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/*
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* EVTCHNOP_unmask: Unmask the specified local event-channel port and deliver
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* a notification to the appropriate VCPU if an event is pending.
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*/
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#define EVTCHNOP_unmask 9
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struct evtchn_unmask {
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/* IN parameters. */
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evtchn_port_t port;
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};
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typedef struct evtchn_unmask evtchn_unmask_t;
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/*
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* EVTCHNOP_reset: Close all event channels associated with specified domain.
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* NOTES:
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* 1. <dom> may be specified as DOMID_SELF.
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* 2. Only a sufficiently-privileged domain may specify other than DOMID_SELF.
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*/
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#define EVTCHNOP_reset 10
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struct evtchn_reset {
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/* IN parameters. */
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domid_t dom;
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};
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typedef struct evtchn_reset evtchn_reset_t;
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/*
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* Argument to event_channel_op_compat() hypercall. Superceded by new
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* event_channel_op() hypercall since 0x00030202.
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*/
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struct evtchn_op {
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uint32_t cmd; /* EVTCHNOP_* */
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union {
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struct evtchn_alloc_unbound alloc_unbound;
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struct evtchn_bind_interdomain bind_interdomain;
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struct evtchn_bind_virq bind_virq;
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struct evtchn_bind_pirq bind_pirq;
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struct evtchn_bind_ipi bind_ipi;
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struct evtchn_close close;
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struct evtchn_send send;
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struct evtchn_status status;
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struct evtchn_bind_vcpu bind_vcpu;
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struct evtchn_unmask unmask;
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} u;
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};
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typedef struct evtchn_op evtchn_op_t;
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DEFINE_XEN_GUEST_HANDLE(evtchn_op_t);
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#endif /* __XEN_PUBLIC_EVENT_CHANNEL_H__ */
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/*
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* Local variables:
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* mode: C
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* c-set-style: "BSD"
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* c-basic-offset: 4
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* tab-width: 4
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* indent-tabs-mode: nil
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* End:
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*/
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