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Add support for a simulated interval timer support verification of the tickless OS.

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This commit is contained in:
Gregory Nutt 2014-08-06 18:29:29 -06:00
parent 595ec296fb
commit c275ebef35
2 changed files with 389 additions and 1 deletions
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8
arch/sim/src/up_idle.c
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@ -1,7 +1,7 @@
/****************************************************************************
* up_idle.c
*
* Copyright (C) 2007-2009, 2011-2012 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011-2012, 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@ -94,11 +94,17 @@ extern void up_x11update(void);
void up_idle(void)
{
#ifdef CONFIG_SCHED_TICKLESS
/* Driver the simulated interval timer */
up_timer_update();
#else
/* If the system is idle, then process "fake" timer interrupts.
* Hopefully, something will wake up.
*/
sched_process_timer();
#endif
/* Run the network if enabled */

382
arch/sim/src/up_tickless.c Normal file
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@ -0,0 +1,382 @@
/****************************************************************************
* arch/sim/up_tickless.c
*
* Copyright (C) 2014 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.
*
****************************************************************************/
/****************************************************************************
* Tickless OS Support.
*
* When CONFIG_SCHED_TICKLESS is enabled, all support for timer interrupts
* is suppressed and the platform specific code is expected to provide the
* following custom functions.
*
* void up_timer_initialize(void): Initializes the timer facilities. Called
* early in the intialization sequence (by up_intialize()).
* int up_timer_gettime(FAR struct timespec *tp): Returns the current
* time from the platform specific time source.
* int up_timer_cancel(void): Cancels the interval timer.
* int up_timer_start(FAR const struct timespec *tp): Start (or re-starts)
* the interval timer.
* int up_timer_resolution(FAR struct timespec *tp): Returns the
* resolution of the interval timer.
*
* The RTOS will provide the following interfaces for use by the platform-
* specific interval timer implementation:
*
* void sched_timer_expiration(void): Called by the platform-specific
* logic when the interval timer expires.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#include <nuttx/arch.h>
#ifdef CONFIG_SCHED_TICKLESS
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if defined(CONFIG_SIM_WALLTIME) || defined(CONFIG_SIM_X11FB)
# define TICK_USEC (1000000 / CLK_TCK)
# define TICK_SEC (TICK_USEC / 1000000)
# define TICK_NSEC ((TICK_USEC % 1000) * 1000)
#else
# define TICK_SEC 0
# define TICK_NSEC (128 * 1000)
#endif
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
static struct timespec g_elapsed_time;
static struct timespec g_interval_delay;
static bool g_timer_active;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_timer_initialize
*
* Description:
* Initializes all platform-specific timer facilities. This function is
* called early in the initialization sequence by up_intialize().
* On return, the current up-time should be available from
* up_timer_gettime() and the interval timer is ready for use (but not
* actively timing.
*
* Provided by platform-specific code and called from the architecture-
* specific logic.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
* Assumptions:
* Called early in the initialization sequence before any special
* concurrency protections are required.
*
****************************************************************************/
void up_timer_initialize(void)
{
}
/****************************************************************************
* Name: up_timer_gettime
*
* Description:
* Return the elapsed time since power-up (or, more correctly, since
* up_timer_initialize() was called). This function is functionally equivalent
* to:
*
* int clock_gettime(clockid_t clockid, FAR struct timespec *tp);
*
* when clockid is CLOCK_MONOTONIC.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the location in which to return the up-time.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* Called from the the normal tasking context. The implementation must
* provide whatever mutual exclusion is necessary for correct operation.
* This can include disabling interrupts in order to assure atomic register
* operations.
*
****************************************************************************/
int up_timer_gettime(FAR struct timespec *tp)
{
tp->tv_sec = g_elapsed_time.tv_sec;
tp->tv_nsec = g_elapsed_time.tv_nsec;
return OK;
}
/****************************************************************************
* Name: up_timer_cancel
*
* Description:
* Cancel the interval timer. up_timer_expiration() will not be called.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* None
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
#ifdef CONFIG_SCHED_TICKLESS
int up_timer_cancel(void)
{
g_interval_delay.tv_nsec = 0;
g_interval_delay.tv_sec = 0;
g_timer_active = false;
}
#endif
/****************************************************************************
* Name: up_timer_start
*
* Description:
* Start the interval timer. up_timer_expiration() will be called at the
* completion of the timeout (unless up_timer_cancel is called to stop
* the timing.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the time interval until up_timer_expiration() is called.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
#ifdef CONFIG_SCHED_TICKLESS
int up_timer_start(FAR const struct timespec *tp)
{
g_interval_delay.tv_nsec = tp->tv_nsec;
g_interval_delay.tv_sec = tp->tv_sec;
g_timer_active = true;
}
#endif
/****************************************************************************
* Name: up_timer_remaining
*
* Description:
* Return the time remaining until the next timer expiratino.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Location to return the remaining time. Zero should be returned
* if the timer is not active.
*
* Returned Value:
* Zero (OK) is returned on success; a negated errno value is returned on
* any failure.
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_remaining(FAR struct timespec *tp)
{
if (g_timer_active)
{
tp->tv_sec = g_interval_delay.tv_nsec;
tp->tv_nsec = g_interval_delay.tv_sec;
}
else
{
tp->tv_sec = 0;
tp->tv_nsec = 0;
}
return OK;
}
/****************************************************************************
* Name: up_timer_resolution
*
* Description:
* Returns the resolution of the interval timer. This defines the minimal
* time separation between two events and is used for scheduling and for
* setting up timed events.
*
* Provided by platform-specific code and called from the RTOS base code.
*
* Input Parameters:
* tp - Provides the location in which to return the timer resolution.
*
* Returned Value:
*
* Assumptions:
* May be called from interrupt level handling or from the normal tasking
* level. Interrupts may need to be disabled internally to assure
* non-reentrancy.
*
****************************************************************************/
int up_timer_resolution(FAR struct timespec *tp)
{
tp->tv_sec = TICK_SEC;
tp->tv_nsec = TICK_NSEC;
return 0;
}
/****************************************************************************
* Name: up_timer_update
*
* Description:
* Called from the IDLE loop to fake one timer tick.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void up_timer_update(void)
{
/* Increment the elapsed time */
g_elapsed_time.tv_nsec += TICK_NSEC;
if (g_elapsed_time.tv_nsec >= 1000000000)
{
g_elapsed_time.tv_nsec++;
g_elapsed_time.tv_sec -= 1000000000;
}
g_elapsed_time.tv_sec += TICK_SEC;
/* Is the interval timer active? */
if (g_timer_active)
{
/* Yes... decrement the interval timer */
if (g_interval_delay.tv_sec < TICK_SEC)
{
/* No more seconds left... the timer has expired */
g_timer_active = false;
sched_timer_expiration();
}
else
{
/* Decrement seconds. May decrement to zero */
g_interval_delay.tv_sec -= TICK_SEC;
/* Decrement nanoseconds */
if (g_interval_delay.tv_nsec > TICK_NSEC)
{
g_interval_delay.tv_nsec -= TICK_NSEC;
}
/* Handle borrow from seconds */
else if (g_interval_delay.tv_sec > 0)
{
if (g_interval_delay.tv_nsec >= TICK_NSEC)
{
g_interval_delay.tv_nsec = 0;
}
else
{
g_interval_delay.tv_sec--;
}
}
/* Otherwise the timer has expired */
else
{
g_timer_active = false;
sched_timer_expiration();
}
}
}
}
#endif /* CONFIG_SCHED_TICKLESS */