Add STM32 critical section monitor time resources

src/drivers/boards/common/stm32/CMakeLists.txt

@@ -36,6 +36,7 @@ add_library(drivers_boards_common_arch
 	board_mcu_version.c
 	board_reset.c
 	board_hw_rev_ver.c
+	board_critmon.c
 )
 add_dependencies(drivers_boards_common_arch prebuild_targets)
 target_link_libraries(drivers_boards_common_arch PRIVATE nuttx_arch)

src/drivers/boards/common/stm32/board_critmon.c

@@ -0,0 +1,79 @@
+/************************************************************************************
+ *
+ *   Copyright (C) 2018 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <time.h>
+#include <fixedmath.h>
+
+#include "dwt.h"
+#include "up_arch.h"
+
+#include <nuttx/clock.h>
+
+#include <arch/board/board.h>
+
+#if defined(CONFIG_SCHED_CRITMONITOR) || defined(CONFIG_SCHED_IRQMONITOR)
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Name: up_critmon_gettime
+ ************************************************************************************/
+
+uint32_t up_critmon_gettime(void)
+{
+	return getreg32(DWT_CYCCNT);
+}
+
+/************************************************************************************
+ * Name: up_critmon_gettime
+ ************************************************************************************/
+
+void up_critmon_convert(uint32_t elapsed, FAR struct timespec *ts)
+{
+	b32_t b32elapsed;
+
+	b32elapsed  = itob32(elapsed) / STM32_SYSCLK_FREQUENCY;
+	ts->tv_sec  = b32toi(b32elapsed);
+	ts->tv_nsec = NSEC_PER_SEC * b32frac(b32elapsed) / b32ONE;
+}
+
+#endif /* CONFIG_SCHED_CRITMONITOR */