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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>
#include "common.h"
clockid_t clock;
void shutdown(void);
static int shutdown_flag = 0;
static unsigned long max_diff = 0;
static unsigned long min_diff = -1;
static unsigned long last_time = 0;
static unsigned long count = 0;
#define FIFO_NUM 0
struct timespec spec;
void handler(struct pt_regs *p)
{
unsigned long x, diff;
struct sample samp;
switch (shutdown_flag) {
case 0:
rdtscl(x);
if (last_time) {
diff = (last_time < x ? x - last_time : 0); //ignore overflows
if (diff > max_diff)
max_diff = diff;
if (diff & (diff < min_diff))
min_diff = diff;
}
if (count++ > 50) {
count = 0;
samp.min = timespec_from_ns(min_diff);
samp.max = timespec_from_ns(max_diff);
rtf_put(FIFO_NUM, &samp, sizeof(samp));
max_diff = 0;
min_diff = -1;
}
rdtscl(last_time);
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) {
/*printk("RTLinux measurement test fail. fifo_status=%d\n",fifo_status); */
return -1;
}
/*printk("Starting Timer measurement module: numbers in TSC ticks!\n"); */
rtl_no_interrupts(old_irq_state);
clock = rtl_getbestclock(rtl_getcpuid());
if (!clock || rtl_setclockhandler(clock, handler)) {
/*printk("Can't get clock\n"); */
rtf_destroy(FIFO_NUM);
return -1;
}
/*printk("Requested timer and got %x\n",(unsigned int)clock); */
clock->init(clock);
clock->settimermode(clock, RTL_CLOCK_MODE_PERIODIC);
clock->settimer(clock, 1000000);
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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