3c66686a43
The ticker was always initialized in the NANOKERNEL init level. In a microkernel, this can cause problems if for the some reason the initialization of the microkernel server is delayed, such as devices initialization in the NANOKERNEL level taking non-insignificant time to complete. What happens in that case is the ticker ISR will start firing and piling up events in the microkernel server stack, and quite quickly overrun it, since it has a finite size, causing random crashes. So, in the microkernel, initialize the ticker once the microkernel server is available. There is no point in sending ticker event before anyway. Change-Id: Ie9e13184f6ad35954023faf3bbff26242284b7be Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*
|
|
* Copyright (c) 2015 Wind River Systems, Inc.
|
|
*
|
|
* 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 Initialize system clock driver
|
|
*
|
|
* Initializing the timer driver is done in this module to reduce code
|
|
* duplication. Although both nanokernel and microkernel systems initialize
|
|
* the timer driver at the same point, the two systems differ in when the system
|
|
* can begin to process system clock ticks. A nanokernel system can process
|
|
* system clock ticks once the driver has initialized. However, in a
|
|
* microkernel system all system clock ticks are deferred (and stored on the
|
|
* kernel server command stack) until the kernel server fiber starts and begins
|
|
* processing any queued ticks.
|
|
*/
|
|
|
|
#include <nanokernel.h>
|
|
#include <init.h>
|
|
#include <drivers/system_timer.h>
|
|
|
|
SYS_INIT(_sys_clock_driver_init,
|
|
#ifdef CONFIG_MICROKERNEL
|
|
MICROKERNEL,
|
|
#else
|
|
NANOKERNEL,
|
|
#endif
|
|
CONFIG_SYSTEM_CLOCK_INIT_PRIORITY);
|