#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>

#define ATHLON
#include "perf.h"
#define N 150000000 /* 150Mb */
#define BLKSIZE 64

char A[N];

void initialize()
{
    int i, j, k;
    for(i = 0; i < N; i++) 
        A[i] = 1;
		
}

void action_slow()
{
    int i, j, k, r = N/BLKSIZE, m;

    for(i = 0; i < BLKSIZE; i++) {
        for(j = 0, k = i; j < r; j++, k+=BLKSIZE) {
            m = A[k];
        }
    }
}

void action_fast()
{
    int i, r;

    for(i = 0; i < N; i++)
        r = A[i];				 
}

/*
 * Before running this program, the 
 * kernel module has to be loaded. 
 * A character special file called `perf'
 * should be created with the major number
 * returned by `register_chrdev' in the
 * kernel module.
 */

main()
{
    unsigned int count[2] = {0,0}, ev[2];
    int fd = open("perf", O_RDWR);
    int r;
	
    assert(fd >= 0);
	
    /* First, select the event to be
     * monitored
     */

    r = ioctl(fd, EVSEL, 0); /* Event Select 0 */
    assert(r >= 0);
	
    ev[0] = DCACHE_MISS | USR | ENABLE;
    ev[1] = 0;
    r = write(fd, ev, sizeof(ev));
    assert(r >= 0);

    r = ioctl(fd, EVCNT, 0); /* Select Event Counter 0 */
    assert(r >= 0);

    initialize();

    r = read(fd, count, sizeof(count));
    assert(r >= 0);
    printf("low = %x, high = %x\n", count[0], count[1]);
    action_fast();
    r = read(fd, count, sizeof(count));
    assert(r >= 0);
    printf("low = %x, high = %x\n", count[0], count[1]);
    printf("\n-----------------------\n");
    action_slow();
    r = read(fd, count, sizeof(count));
    assert(r >= 0);
    printf("low = %x, high = %x\n", count[0], count[1]);
}