systimer: support etm event

components/esp_system/include/esp_systick_etm.h

@@ -0,0 +1,31 @@
+/*
+ * SPDX-FileCopyrightText: 2022 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#pragma once
+
+#include "esp_err.h"
+#include "esp_etm.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Get the ETM event handle of systick hardware's alarm/heartbeat event
+ *
+ * @note The created ETM event object can be deleted later by calling `esp_etm_del_event`
+ *
+ * @param[in] core_id CPU core ID
+ * @param[out] out_event Returned ETM event handle
+ * @return
+ *      - ESP_OK Success
+ *      - ESP_ERR_INVALID_ARG Parameter error
+ */
+esp_err_t esp_systick_new_etm_alarm_event(int core_id, esp_etm_event_handle_t *out_event);
+
+#ifdef __cplusplus
+}
+#endif