1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
33 /*-
62  * \file control.c
64  * \brief Device driver to repond to control domain events that impact
109 #include <xen/xen-os.h>
123 /*--------------------------- Forward Declarations --------------------------*/
132 /*-------------------------- Private Data Structures -------------------------*/
152 /*------------------------------ Event Handlers ------------------------------*/
169 	printf("WARNING: xen/control: Suspend not supported!\n");  in xctrl_suspend()
214 	 * are resuming, and will allow us to reset per-cpu  in xctrl_suspend()
226 		 * are resuming, and will allow us to reset per-cpu  in xctrl_suspend()
283 	timecounter->tc_get_timecount(timecounter);  in xctrl_suspend()
331 /*------------------------------ Event Reception -----------------------------*/
341 	error = xs_read(XST_NIL, "control", "shutdown",  in xctrl_on_watch_event()
347 	error = xs_write(XST_NIL, "control", "shutdown", "");  in xctrl_on_watch_event()
354 		if (!strcmp(result, reason->name)) {  in xctrl_on_watch_event()
355 			reason->handler();  in xctrl_on_watch_event()
364 /*------------------ Private Device Attachment Functions  --------------------*/
370 	 * Notify kernel is ready to handle "control/shutdown" events.  Ignore  in notify_support()
372 	 * parent "control" directory should be read-only for the guest.  in notify_support()
374 	xs_write(XST_NIL, "control", "feature-poweroff", "1");  in notify_support()
375 	xs_write(XST_NIL, "control", "feature-reboot", "1");  in notify_support()
376 	xs_write(XST_NIL, "control", "feature-suspend", "1");  in notify_support()
383  * \param parent  The NewBus parent device for any devices this method adds.
386 xctrl_identify(driver_t *driver, device_t parent)  in xctrl_identify()  argument
392 	BUS_ADD_CHILD(parent, 0, driver->name, 0);  in xctrl_identify()
396  * \brief Probe for the existence of the Xen Control device
398  * \param dev  NewBus device_t for this Xen control instance.
405 	device_set_desc(dev, "Xen Control Device");  in xctrl_probe()
411  * \brief Attach the Xen control device.
413  * \param dev  NewBus device_t for this Xen control instance.
426 	xctrl->xctrl_watch.node = "control/shutdown";  in xctrl_attach()
427 	xctrl->xctrl_watch.callback = xctrl_on_watch_event;  in xctrl_attach()
428 	xctrl->xctrl_watch.callback_data = (uintptr_t)xctrl;  in xctrl_attach()
434 	xctrl->xctrl_watch.max_pending = 1;  in xctrl_attach()
435 	xs_register_watch(&xctrl->xctrl_watch);  in xctrl_attach()
446  * \brief Detach the Xen control device.
448  * \param dev  NewBus device_t for this Xen control device instance.
461 	xs_unregister_watch(&xctrl->xctrl_watch);  in xctrl_detach()
474 /*-------------------- Private Device Attachment Data  -----------------------*/