diff options
Diffstat (limited to 'OvmfPkg/XenBusDxe/XenStore.c')
| -rw-r--r-- | OvmfPkg/XenBusDxe/XenStore.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/OvmfPkg/XenBusDxe/XenStore.c b/OvmfPkg/XenBusDxe/XenStore.c index 4b99c9ca1f..aed6b141bd 100644 --- a/OvmfPkg/XenBusDxe/XenStore.c +++ b/OvmfPkg/XenBusDxe/XenStore.c @@ -941,6 +941,46 @@ XenStoreUnwatch ( return XenStoreTalkv (XST_NIL, XS_UNWATCH, WriteRequest, 2, NULL, NULL);
}
+STATIC
+XENSTORE_STATUS
+XenStoreWaitWatch (
+ VOID *Token
+ )
+{
+ XENSTORE_MESSAGE *Message;
+ LIST_ENTRY *Entry = NULL;
+ LIST_ENTRY *Last = NULL;
+ XENSTORE_STATUS Status;
+
+ while (TRUE) {
+ EfiAcquireLock (&xs.WatchEventsLock);
+ if (IsListEmpty (&xs.WatchEvents) ||
+ Last == GetFirstNode (&xs.WatchEvents)) {
+ EfiReleaseLock (&xs.WatchEventsLock);
+ Status = XenStoreProcessMessage ();
+ if (Status != XENSTORE_STATUS_SUCCESS && Status != XENSTORE_STATUS_EAGAIN) {
+ return Status;
+ }
+ continue;
+ }
+
+ for (Entry = GetFirstNode (&xs.WatchEvents);
+ Entry != Last && !IsNull (&xs.WatchEvents, Entry);
+ Entry = GetNextNode (&xs.WatchEvents, Entry)) {
+ Message = XENSTORE_MESSAGE_FROM_LINK (Entry);
+ if (Message->u.Watch.Handle == Token) {
+ RemoveEntryList (Entry);
+ EfiReleaseLock (&xs.WatchEventsLock);
+ FreePool(Message->u.Watch.Vector);
+ FreePool(Message);
+ return XENSTORE_STATUS_SUCCESS;
+ }
+ }
+ Last = GetFirstNode (&xs.WatchEvents);
+ EfiReleaseLock (&xs.WatchEventsLock);
+ }
+}
+
VOID
EFIAPI
NotifyEventChannelCheckForEvent (
@@ -1384,3 +1424,127 @@ XenStoreUnregisterWatch ( FreePool (Watch->Node);
FreePool (Watch);
}
+
+
+//
+// XENBUS protocol
+//
+
+XENSTORE_STATUS
+EFIAPI
+XenBusWaitForWatch (
+ IN XENBUS_PROTOCOL *This,
+ IN VOID *Token
+ )
+{
+ return XenStoreWaitWatch (Token);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreRead (
+ IN XENBUS_PROTOCOL *This,
+ IN XENSTORE_TRANSACTION Transaction,
+ IN CONST CHAR8 *Node,
+ OUT VOID **Value
+ )
+{
+ return XenStoreRead (Transaction, This->Node, Node, NULL, Value);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreBackendRead (
+ IN XENBUS_PROTOCOL *This,
+ IN XENSTORE_TRANSACTION Transaction,
+ IN CONST CHAR8 *Node,
+ OUT VOID **Value
+ )
+{
+ return XenStoreRead (Transaction, This->Backend, Node, NULL, Value);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreRemove (
+ IN XENBUS_PROTOCOL *This,
+ IN XENSTORE_TRANSACTION Transaction,
+ IN const char *Node
+ )
+{
+ return XenStoreRemove (Transaction, This->Node, Node);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreTransactionStart (
+ IN XENBUS_PROTOCOL *This,
+ OUT XENSTORE_TRANSACTION *Transaction
+ )
+{
+ return XenStoreTransactionStart (Transaction);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreTransactionEnd (
+ IN XENBUS_PROTOCOL *This,
+ IN XENSTORE_TRANSACTION Transaction,
+ IN BOOLEAN Abort
+ )
+{
+ return XenStoreTransactionEnd (Transaction, Abort);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusXenStoreSPrint (
+ IN XENBUS_PROTOCOL *This,
+ IN XENSTORE_TRANSACTION Transaction,
+ IN CONST CHAR8 *DirectoryPath,
+ IN CONST CHAR8 *Node,
+ IN CONST CHAR8 *FormatString,
+ ...
+ )
+{
+ VA_LIST Marker;
+ XENSTORE_STATUS Status;
+
+ VA_START (Marker, FormatString);
+ Status = XenStoreVSPrint (Transaction, DirectoryPath, Node, FormatString, Marker);
+ VA_END (Marker);
+
+ return Status;
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusRegisterWatch (
+ IN XENBUS_PROTOCOL *This,
+ IN CONST CHAR8 *Node,
+ OUT VOID **Token
+ )
+{
+ return XenStoreRegisterWatch (This->Node, Node, (XENSTORE_WATCH **) Token);
+}
+
+XENSTORE_STATUS
+EFIAPI
+XenBusRegisterWatchBackend (
+ IN XENBUS_PROTOCOL *This,
+ IN CONST CHAR8 *Node,
+ OUT VOID **Token
+ )
+{
+ return XenStoreRegisterWatch (This->Backend, Node, (XENSTORE_WATCH **) Token);
+}
+
+VOID
+EFIAPI
+XenBusUnregisterWatch (
+ IN XENBUS_PROTOCOL *This,
+ IN VOID *Token
+ )
+{
+ XenStoreUnregisterWatch ((XENSTORE_WATCH *) Token);
+}
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