Trusted Firmware-A Tests, version 2.0

This is the first public version of the tests for the Trusted
Firmware-A project. Please see the documentation provided in the
source tree for more details.

Change-Id: I6f3452046a1351ac94a71b3525c30a4ca8db7867
Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Co-authored-by: amobal01 <amol.balasokamble@arm.com>
Co-authored-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
Co-authored-by: Asha R <asha.r@arm.com>
Co-authored-by: Chandni Cherukuri <chandni.cherukuri@arm.com>
Co-authored-by: David Cunado <david.cunado@arm.com>
Co-authored-by: Dimitris Papastamos <dimitris.papastamos@arm.com>
Co-authored-by: Douglas Raillard <douglas.raillard@arm.com>
Co-authored-by: dp-arm <dimitris.papastamos@arm.com>
Co-authored-by: Jeenu Viswambharan <jeenu.viswambharan@arm.com>
Co-authored-by: Jonathan Wright <jonathan.wright@arm.com>
Co-authored-by: Kévin Petit <kevin.petit@arm.com>
Co-authored-by: Roberto Vargas <roberto.vargas@arm.com>
Co-authored-by: Sathees Balya <sathees.balya@arm.com>
Co-authored-by: Shawon Roy <Shawon.Roy@arm.com>
Co-authored-by: Soby Mathew <soby.mathew@arm.com>
Co-authored-by: Thomas Abraham <thomas.abraham@arm.com>
Co-authored-by: Vikram Kanigiri <vikram.kanigiri@arm.com>
Co-authored-by: Yatharth Kochar <yatharth.kochar@arm.com>
diff --git a/lib/events/events.c b/lib/events/events.c
new file mode 100644
index 0000000..42130d5
--- /dev/null
+++ b/lib/events/events.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2018, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include <events.h>
+#include <platform_def.h>
+#include <tftf.h>
+#include <tftf_lib.h>
+
+void tftf_init_event(event_t *event)
+{
+	assert(event != NULL);
+	event->cnt = 0;
+	event->lock.lock = 0;
+}
+
+static void send_event_common(event_t *event, unsigned int inc)
+{
+	spin_lock(&event->lock);
+	event->cnt += inc;
+	spin_unlock(&event->lock);
+
+	sev();
+}
+
+void tftf_send_event(event_t *event)
+{
+	VERBOSE("Sending event %p\n", (void *) event);
+	send_event_common(event, 1);
+}
+
+void tftf_send_event_to_all(event_t *event)
+{
+	VERBOSE("Sending event %p to all CPUs\n", (void *) event);
+	send_event_common(event, PLATFORM_CORE_COUNT);
+}
+
+void tftf_send_event_to(event_t *event, unsigned int cpus_count)
+{
+	assert(cpus_count <= PLATFORM_CORE_COUNT);
+	VERBOSE("Sending event %p to %u CPUs\n", (void *) event, cpus_count);
+	send_event_common(event, cpus_count);
+}
+
+void tftf_wait_for_event(event_t *event)
+{
+	unsigned int event_received = 0;
+
+	VERBOSE("Waiting for event %p\n", (void *) event);
+	while (!event_received) {
+
+		dsbsy();
+		/* Wait for someone to send an event */
+		if (!event->cnt) {
+			wfe();
+		} else {
+			spin_lock(&event->lock);
+
+			 /*
+			  * Check that the event is still pending and that no
+			  * one stole it from us while we were trying to
+			  * acquire the lock.
+			  */
+			if (event->cnt != 0) {
+				event_received = 1;
+				--event->cnt;
+			}
+			/*
+			 * No memory barrier is needed here because spin_unlock()
+			 * issues a Store-Release instruction, which guarantees
+			 * that loads and stores appearing in program order
+			 * before the Store-Release are observed before the
+			 * Store-Release itself.
+			 */
+			spin_unlock(&event->lock);
+		}
+	}
+
+	VERBOSE("Received event %p\n", (void *) event);
+}