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/*
* (C) Finite State Machine Labs Inc. 1999 business@fsmlabs.com
*
* Released under the terms of GPL 2.
* Open RTLinux makes use of a patented process described in
* US Patent 5,995,745. Use of this process is governed
* by the Open RTLinux Patent License which can be obtained from
* www.fsmlabs.com/PATENT or by sending email to
* licensequestions@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++ > 10) {
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_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);
return -1;
}
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;
}
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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