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https://github.com/zephyrproject-rtos/zephyr
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617f9c5b4c
The nanokernel time tracking code (ticker) can now exist in microkernel systems. This allows the ticker that drives nano timers and timeouts to advance the tick count for these in a microkernel, thus allow their presence there. Previously, nano timers could not be used in a microkernel. Change-Id: I17f2b659691a081b0f9bf3961ed030533aa02a15 Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com>
86 lines
3.0 KiB
C
86 lines
3.0 KiB
C
/* Variables needed needed for system clock */
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/*
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* Copyright (c) 2014-2015 Wind River Systems, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2) Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3) Neither the name of Wind River Systems nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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DESCRIPTION
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Declare variables used by both system timer device driver and kernel components
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that use timer functionality.
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*/
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#ifndef _CLOCK_VARS__H_
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#define _CLOCK_VARS__H_
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#ifndef _ASMLANGUAGE
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#include <stdint.h>
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#define sys_clock_ticks_per_sec CONFIG_SYS_CLOCK_TICKS_PER_SEC
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#define sys_clock_hw_cycles_per_sec CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC
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/*
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* sys_clock_us_per_tick global variable represents a number
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* of microseconds in one OS timer tick
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*/
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extern int sys_clock_us_per_tick;
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/*
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* sys_clock_hw_cycles_per_tick global variable represents a number
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* of platform clock ticks in one OS timer tick.
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* sys_clock_hw_cycles_per_tick often represents a value of divider
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* of the board clock frequency
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*/
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extern int sys_clock_hw_cycles_per_tick;
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/* number of nsec per usec */
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#define NSEC_PER_USEC 1000
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/* SYS_CLOCK_HW_CYCLES_TO_NS64 converts CPU clock cycles to nanoseconds */
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#define SYS_CLOCK_HW_CYCLES_TO_NS64(X) \
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(((uint64_t)(X) * sys_clock_us_per_tick * NSEC_PER_USEC) / \
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sys_clock_hw_cycles_per_tick)
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/*
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* SYS_CLOCK_HW_CYCLES_TO_NS_AVG converts CPU clock cycles to nanoseconds
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* and calculates the average cycle time
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*/
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#define SYS_CLOCK_HW_CYCLES_TO_NS_AVG(X, NCYCLES) \
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(uint32_t)(SYS_CLOCK_HW_CYCLES_TO_NS64(X) / NCYCLES)
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#define SYS_CLOCK_HW_CYCLES_TO_NS(X) (uint32_t)(SYS_CLOCK_HW_CYCLES_TO_NS64(X))
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extern int64_t _nano_ticks;
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extern struct nano_timer *_nano_timer_list;
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#endif /* !_ASMLANGUAGE */
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#endif /* _CLOCK_VARS__H_ */
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