efi_console: set up events

Set up a timer event and the WaitForKey event.
In the notify function of the timer event check for console input
and signal the WaitForKey event accordingly.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Alexander Graf <agraf@suse.de>

cmd/bootefi.c

@@ -226,6 +226,7 @@ static unsigned long do_bootefi_exec(void *efi, void *fdt)
 	INIT_LIST_HEAD(&efi_obj_list);
 	list_add_tail(&loaded_image_info_obj.link, &efi_obj_list);
 	list_add_tail(&bootefi_device_obj.link, &efi_obj_list);
+	efi_console_register();
 #ifdef CONFIG_PARTITIONS
 	efi_disk_register();
 #endif

include/efi_loader.h

@@ -26,7 +26,7 @@ extern struct efi_runtime_services efi_runtime_services;
 extern struct efi_system_table systab;
 
 extern const struct efi_simple_text_output_protocol efi_con_out;
-extern const struct efi_simple_input_interface efi_con_in;
+extern struct efi_simple_input_interface efi_con_in;
 extern const struct efi_console_control_protocol efi_console_control;
 extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
 
@@ -90,6 +90,8 @@ struct efi_event {
 /* This list contains all UEFI objects we know of */
 extern struct list_head efi_obj_list;
 
+/* Called by bootefi to make console interface available */
+int efi_console_register(void);
 /* Called by bootefi to make all disk storage accessible as EFI objects */
 int efi_disk_register(void);
 /* Called by bootefi to make GOP (graphical) interface available */
@@ -125,6 +127,8 @@ efi_status_t efi_create_event(enum efi_event_type type, UINTN notify_tpl,
 /* Call this to set a timer */
 efi_status_t efi_set_timer(struct efi_event *event, int type,
 			   uint64_t trigger_time);
+/* Call this to signal an event */
+void efi_signal_event(struct efi_event *event);
 
 /* Generic EFI memory allocator, call this to get memory */
 void *efi_alloc(uint64_t len, int memory_type);

lib/efi_loader/efi_boottime.c

@@ -81,7 +81,7 @@ efi_status_t efi_exit_func(efi_status_t ret)
 	return ret;
 }
 
-static void efi_signal_event(struct efi_event *event)
+void efi_signal_event(struct efi_event *event)
 {
 	if (event->signaled)
 		return;

lib/efi_loader/efi_console.c

@@ -421,8 +421,46 @@ static efi_status_t EFIAPI efi_cin_read_key_stroke(
 	return EFI_EXIT(EFI_SUCCESS);
 }
 
-const struct efi_simple_input_interface efi_con_in = {
+struct efi_simple_input_interface efi_con_in = {
 	.reset = efi_cin_reset,
 	.read_key_stroke = efi_cin_read_key_stroke,
 	.wait_for_key = NULL,
 };
+
+static struct efi_event *console_timer_event;
+
+static void efi_key_notify(struct efi_event *event, void *context)
+{
+}
+
+static void efi_console_timer_notify(struct efi_event *event, void *context)
+{
+	EFI_ENTRY("%p, %p", event, context);
+	if (tstc())
+		efi_signal_event(efi_con_in.wait_for_key);
+	EFI_EXIT(EFI_SUCCESS);
+}
+
+/* This gets called from do_bootefi_exec(). */
+int efi_console_register(void)
+{
+	efi_status_t r;
+	r = efi_create_event(EVT_NOTIFY_WAIT, TPL_CALLBACK,
+			     efi_key_notify, NULL, &efi_con_in.wait_for_key);
+	if (r != EFI_SUCCESS) {
+		printf("ERROR: Failed to register WaitForKey event\n");
+		return r;
+	}
+	r = efi_create_event(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
+			     efi_console_timer_notify, NULL,
+			     &console_timer_event);
+	if (r != EFI_SUCCESS) {
+		printf("ERROR: Failed to register console event\n");
+		return r;
+	}
+	/* 5000 ns cycle is sufficient for 2 MBaud */
+	r = efi_set_timer(console_timer_event, EFI_TIMER_PERIODIC, 50);
+	if (r != EFI_SUCCESS)
+		printf("ERROR: Failed to set console timer\n");
+	return r;
+}