xen: Add essential and required interface headers

Add essential and required Xen interface headers only taken from
the stable Linux kernel stable/linux-5.7.y at commit
66dfe4522160 Linux 5.7.5.

These are better suited for U-boot than the original headers
from Xen as they are the stripped versions of the same.

At the same time use public protocols from Xen RELEASE-4.13.1, at
commit 6278553325a9 update Xen version to 4.13.1
as those have more comments in them.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Acked-by: Peng Fan <peng.fan@nxp.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/include/xen/interface/io/xenbus.h b/include/xen/interface/io/xenbus.h
new file mode 100644
index 00000000000..946d46ddb1b
--- /dev/null
+++ b/include/xen/interface/io/xenbus.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: MIT
+ *
+ * xenbus.h
+ *
+ * Xenbus protocol details.
+ *
+ * Copyright (C) 2005 XenSource Ltd.
+ */
+
+#ifndef _XEN_PUBLIC_IO_XENBUS_H
+#define _XEN_PUBLIC_IO_XENBUS_H
+
+/*
+ * The state of either end of the Xenbus, i.e. the current communication
+ * status of initialisation across the bus.  States here imply nothing about
+ * the state of the connection between the driver and the kernel's device
+ * layers.
+ */
+enum xenbus_state {
+	XenbusStateUnknown       = 0,
+
+	XenbusStateInitialising  = 1,
+
+	/*
+	 * InitWait: Finished early initialisation but waiting for information
+	 * from the peer or hotplug scripts.
+	 */
+	XenbusStateInitWait      = 2,
+
+	/*
+	 * Initialised: Waiting for a connection from the peer.
+	 */
+	XenbusStateInitialised   = 3,
+
+	XenbusStateConnected     = 4,
+
+	/*
+	 * Closing: The device is being closed due to an error or an unplug event.
+	 */
+	XenbusStateClosing       = 5,
+
+	XenbusStateClosed        = 6,
+
+	/*
+	 * Reconfiguring: The device is being reconfigured.
+	 */
+	XenbusStateReconfiguring = 7,
+
+	XenbusStateReconfigured  = 8
+};
+
+typedef enum xenbus_state XenbusState;
+
+#endif /* _XEN_PUBLIC_IO_XENBUS_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */