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#define _XOPEN_SOURCE 500
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/io.h>
#include <sys/mman.h>
#include <dirent.h>
#include <ctype.h>
#include <malloc.h>
#include <string.h>
#include <signal.h>
#include <getopt.h>
#include <linux/pci.h>
#include <sys/time.h>
#define DATA_REG 0x62
#define CST_REG 0x66
typedef unsigned short u16;
static void ecr_set(u16 addr, u16 value)
{
while (inw(CST_REG) & 3) usleep(1);
outw(0x81, CST_REG);
while (inw(CST_REG) & 2) usleep(1);
outw(addr, DATA_REG);
while (inw(CST_REG) & 2) usleep(1);
outw(value, DATA_REG);
while (inw(CST_REG) & 2) usleep(1);
}
static u16 ecr_get(u16 addr)
{
while (inw(CST_REG) & 3) usleep(1);
outb(0x80, CST_REG);
while (inw(CST_REG) & 2) usleep(1);
outb(addr, DATA_REG);
while (inw(CST_REG) & 2) usleep(1);
return inw(DATA_REG);
}
int main(int argc, char *argv[])
{
iopl(3);
printf("currently %x\n", ecr_get(0x96));
ecr_set(0x96, atoi(argv[1]));
return 0;
}
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