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/*
* Periodic timing measurement for RTLinux.
*
* Copyright (C) 1999 FSM Labs (http://www.fsmlabs.com/)
* Written by Cort Dougan <cort@fsmlabs.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <asm/ptrace.h>
#include <rtl_core.h>
#include <asm/io.h>
#include <rtl_sync.h>
#include <rtl_fifo.h>
#include <rtl_time.h>
#include <rtl_core.h>
clockid_t clock;
void shutdown(void);
static int shutdown_flag = 0;
hrtime_t last_time;
#define FIFO_NUM 0
struct samp
{
hrtime_t min, max, total;
hrtime_t period;
int cnt;
};
struct samp sm;
int period_cnt = 0;
hrtime_t period;
void handler(struct pt_regs *p)
{
hrtime_t x, y;
switch( shutdown_flag )
{
case 0:
if ( last_time )
{
y = x = gethrtime();
if ( last_time > x )
goto out;
x = x - last_time;
if ( (ulong)sm.max < (ulong)x )
sm.max = x;
if ( (ulong)sm.min > (ulong)x )
sm.min = x;
sm.total += x;
if( sm.cnt++ > 100 )
{
sm.period = period;
rtf_put( FIFO_NUM, &sm, sizeof(sm) );
sm.cnt = 0;
sm.max = 0;
sm.min = HRTIME_INFINITY;
sm.total = 0;
}
}
out:
clock->settimer(clock, period);
last_time = gethrtime();
break;
case 1:
shutdown_flag = 2;
default: /* do nothing */
}
return;
}
int fifo_size=4000;
int init_module(void)
{
rtl_irqstate_t old_irq_state;
int fifo_status;
rtf_destroy(FIFO_NUM); /* just in case someone else is using!*/
fifo_status = rtf_create(FIFO_NUM, fifo_size);
if (fifo_status) {
rtl_printf("RTLinux measurement test fail. fifo_status=%d\n",fifo_status);
return -1;
}
rtl_printf ("Starting Timer measurement module\n");
rtl_no_interrupts(old_irq_state);
clock = rtl_getbestclock(rtl_getcpuid());
if (!clock || rtl_setclockhandler(clock, handler)) {
rtl_printf("Can't get clock\n");
rtf_destroy(FIFO_NUM);
goto out;
}
sm.cnt = 0;
sm.max = 0;
sm.min = HRTIME_INFINITY;
sm.total = 0;
last_time = 0;
period = 1000000;
clock->init(clock);
clock->settimermode(clock, RTL_CLOCK_MODE_ONESHOT);
clock->settimer(clock, period);
rtl_restore_interrupts(old_irq_state);
return 0;
out:
rtl_restore_interrupts(old_irq_state);
return -1;
}
void shutdown(){
rtl_irqstate_t old_irq_state;
rtl_no_interrupts(old_irq_state);
clock->uninit(clock);
rtl_restore_interrupts(old_irq_state);
rtf_destroy(FIFO_NUM);
}
void cleanup_module(void)
{
int timeout = 100000;
shutdown_flag = 1;
while((shutdown_flag==1) && timeout--);
/* so it's kinda sloppy, wait for timeout or for
interrupt routine to ack shutdown, whatever comes
first */
shutdown();
}
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