nios2: implement kernel_event_logger

Interrupts and context switches are logged. Since this CPU does not
have a power-saving instruction, it never enters a sleep state so
we do not call _sys_k_event_logger_enter_sleep() from anywhere.

Change-Id: Idcef388e93ffea373446997a0f87e93a4db44331
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

arch/nios2/core/irq_manage.c

@@ -27,6 +27,7 @@
 #include <irq.h>
 #include <misc/printk.h>
 #include <sw_isr_table.h>
+#include <misc/kernel_event_logger.h>
 
 void _irq_spurious(void *unused)
 {
@@ -102,6 +103,10 @@ void _enter_irq(uint32_t ipending)
 	while (ipending) {
 		_IsrTableEntry_t *ite;
 
+#ifdef CONFIG_KERNEL_EVENT_LOGGER_INTERRUPT
+		_sys_k_event_logger_interrupt();
+#endif
+
 		index = find_lsb_set(ipending) - 1;
 		ipending &= ~(1 << index);
 

arch/nios2/core/swap.S

@@ -23,6 +23,9 @@
 GTEXT(_Swap)
 GTEXT(_thread_entry_wrapper)
 
+/* imports */
+GTEXT(_sys_k_event_logger_context_switch)
+
 /* unsigned int _Swap(unsigned int key)
  *
  * Always called with interrupts locked
@@ -58,7 +61,9 @@ SECTION_FUNC(exception.other, _Swap)
 	 */
 	stw r4, __tTCS_coopReg_OFFSET + __t_coop_key_OFFSET(r11)
 
-	/* FIXME call _sys_k_event_logger_context_switch */
+#if CONFIG_KERNEL_EVENT_LOGGER_CONTEXT_SWITCH
+	call _sys_k_event_logger_context_switch
+#endif
 
 	/* Find the next context to run. Choose _nanokernel.fiber
 	 * if non-NULL */

arch/nios2/include/kernel_event_logger_arch.h

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2016 Intel Corporation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @brief Kernel event logger support for Nios II
+ */
+
+#ifndef __KERNEL_EVENT_LOGGER_ARCH_H__
+#define __KERNEL_EVENT_LOGGER_ARCH_H__
+
+#include <arch/cpu.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * @brief Get the identification of the current interrupt.
+ *
+ * This routine obtain the key of the interrupt that is currently processed
+ * if it is called from a ISR context.
+ *
+ * @return The key of the interrupt that is currently being processed.
+ */
+static inline int _sys_current_irq_key_get(void)
+{
+	uint32_t ipending;
+
+	ipending = _nios2_creg_read(NIOS2_CR_IPENDING);
+	return find_lsb_set(ipending) - 1;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __KERNEL_EVENT_LOGGER_ARCH_H__ */