#include <linux/module.h>#include <linux/kernel.h>#include <rtl_fifo.h>#include <asm/rt_irq.h>#include <asm/rt_time.h>#include <rtl_sched.h>#include <asm/io.h>#include <linux/cons.h>#include "common.h"#define TIMEOUT 100000#define SKIP 1000#define PERIOD 500RT_TASK mytask;RTIME min_response;RTIME max_response;struct sample samp;int skip;void fun(int t) {	register int i;	register int orig;	int flags;	RTIME before, after, response;	while (1) {		for (skip = 0; skip < SKIP; skip++) {			r_save_flags(flags);			r_cli();			outb_p(0, LPT_PORT);			orig = inb_p(LPT_PORT + 1);						outb(1, LPT_PORT);			before = rt_get_time();			i = 0;			while ((inb(LPT_PORT + 1) == orig) && i++ < TIMEOUT);			after = rt_get_time();						if (i >= TIMEOUT) {				conpr("timeout!!!\n");				return;			}			response = after - before;			if (response < min_response) {				min_response = response;			}			if (response > max_response) {				max_response = response;			}			r_restore_flags(flags);			rt_task_wait();		}		samp.min = min_response;		samp.max = max_response;		rtf_put(0, &samp, sizeof(samp));	}}int init_module(void){	RTIME now = rt_get_time();	min_response = 1000000000;	max_response = 0;	rtf_create(0, 4000);	rt_task_init(&mytask, fun, 1, 3000, 4);	rt_task_make_periodic(&mytask, now + 3000, PERIOD);	return 0;}void cleanup_module(void){	rt_task_delete(&mytask);		rtf_destroy(0);}