e86895d9e4
This patch adds three event channel related functions: - EventChannelAllocate: Allocate an event channel port that can be bind from a specified domain. - EventChannelNotify: Send an event to the remote end of a channel. - EventChannelClose: Close a local event channel port. Change in V3: - eventchannel, update protocol to return error code. - expand patch description - Add comments in the XenBus Protocol header. Change in V2: - coding style - adding comment to functions - Rename Xenbus to XenBus. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16271 6f19259b-4bc3-4df7-8a09-765794883524
89 lines
2.2 KiB
C
89 lines
2.2 KiB
C
/** @file
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Event Channel function implementation.
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Event channel are use to notify of an event that happend in a shared
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structure for example.
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Copyright (C) 2014, Citrix Ltd.
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "EventChannel.h"
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#include "XenHypercall.h"
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UINT32
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XenEventChannelNotify (
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IN XENBUS_DEVICE *Dev,
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IN evtchn_port_t Port
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)
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{
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INTN ReturnCode;
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evtchn_send_t Send;
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Send.port = Port;
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ReturnCode = XenHypercallEventChannelOp (Dev, EVTCHNOP_send, &Send);
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return ReturnCode;
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}
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UINT32
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EFIAPI
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XenBusEventChannelAllocate (
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IN XENBUS_PROTOCOL *This,
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IN domid_t DomainId,
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OUT evtchn_port_t *Port
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)
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{
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XENBUS_PRIVATE_DATA *Private;
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evtchn_alloc_unbound_t Parameter;
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UINT32 ReturnCode;
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Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
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Parameter.dom = DOMID_SELF;
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Parameter.remote_dom = DomainId;
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ReturnCode = XenHypercallEventChannelOp (Private->Dev,
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EVTCHNOP_alloc_unbound,
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&Parameter);
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if (ReturnCode != 0) {
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DEBUG ((EFI_D_ERROR, "ERROR: alloc_unbound failed with rc=%d", ReturnCode));
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return ReturnCode;
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}
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*Port = Parameter.port;
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return ReturnCode;
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}
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UINT32
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EFIAPI
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XenBusEventChannelNotify (
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IN XENBUS_PROTOCOL *This,
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IN evtchn_port_t Port
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)
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{
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XENBUS_PRIVATE_DATA *Private;
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Private = XENBUS_PRIVATE_DATA_FROM_THIS(This);
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return XenEventChannelNotify (Private->Dev, Port);
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}
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UINT32
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EFIAPI
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XenBusEventChannelClose (
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IN XENBUS_PROTOCOL *This,
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IN evtchn_port_t Port
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)
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{
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XENBUS_PRIVATE_DATA *Private;
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evtchn_close_t Close;
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Private = XENBUS_PRIVATE_DATA_FROM_THIS (This);
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Close.port = Port;
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return XenHypercallEventChannelOp (Private->Dev, EVTCHNOP_close, &Close);
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}
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