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OvmfPkg/XenBusDxe: Add Event Channel into XenBus protocol.

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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
This commit is contained in:
Anthony PERARD
2014-10-29 06:51:26 +00:00
committed by jljusten
parent 86d968e05e
commit e86895d9e4
4 changed files with 163 additions and 0 deletions
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53
OvmfPkg/Include/Protocol/XenBus.h
View File

@@ -63,6 +63,7 @@ typedef enum {
#include <IndustryStandard/Xen/grant_table.h>
#include <IndustryStandard/Xen/event_channel.h>
///
/// Function prototypes
@@ -249,6 +250,54 @@ EFI_STATUS
IN grant_ref_t Ref
);
/**
Allocate a port that can be bind from domain DomainId.
@param This A pointer to the XENBUS_PROTOCOL.
@param DomainId The domain ID that can bind the newly allocated port.
@param Port A pointer to a evtchn_port_t that will contain the newly
allocated port.
@retval UINT32 The return value from the hypercall, 0 if success.
**/
typedef
UINT32
(EFIAPI *XENBUS_EVENT_CHANNEL_ALLOCATE) (
IN XENBUS_PROTOCOL *This,
IN domid_t DomainId,
OUT evtchn_port_t *Port
);
/**
Send an event to the remote end of the channel whose local endpoint is Port.
@param This A pointer to the XENBUS_PROTOCOL.
@param Port Local port to the the event from.
@retval UINT32 The return value from the hypercall, 0 if success.
**/
typedef
UINT32
(EFIAPI *XENBUS_EVENT_CHANNEL_NOTIFY) (
IN XENBUS_PROTOCOL *This,
IN evtchn_port_t Port
);
/**
Close a local event channel Port.
@param This A pointer to the XENBUS_PROTOCOL.
@param Port The event channel to close.
@retval UINT32 The return value from the hypercall, 0 if success.
**/
typedef
UINT32
(EFIAPI *XENBUS_EVENT_CHANNEL_CLOSE) (
IN XENBUS_PROTOCOL *This,
IN evtchn_port_t Port
);
/**
Register a XenStore watch.
@@ -345,6 +394,10 @@ struct _XENBUS_PROTOCOL {
XENBUS_GRANT_ACCESS GrantAccess;
XENBUS_GRANT_END_ACCESS GrantEndAccess;
XENBUS_EVENT_CHANNEL_ALLOCATE EventChannelAllocate;
XENBUS_EVENT_CHANNEL_NOTIFY EventChannelNotify;
XENBUS_EVENT_CHANNEL_CLOSE EventChannelClose;
XENBUS_REGISTER_WATCH RegisterWatch;
XENBUS_REGISTER_WATCH_BACKEND RegisterWatchBackend;
XENBUS_UNREGISTER_WATCH UnregisterWatch;