char *read_dev() {
int cnt = 0;
while((in( CMD_PORT ) & 0xc0) != READY_STAT);
bzero ( buffer, SECTOR_SIZE);
out(DRV_AND_HEAD_PORT,0xa0);
wait();
out(SECTOR_COUNT_PORT,0x01);
wait();
out(SECTOR_NUM_PORT,0x01);
wait();
out(CYL_LOW_PORT,0x00);
wait();
out(CYL_HIGH_PORT,0x00);
wait();
out(CMD_PORT,0x20);
asm(""::"c"(SECTOR_IN_WORDS),"d"(DATA_PORT),"D"(buffer));
asm("rep insw");
return buffer;
}
i use this code to read MBR from my ide hdd. when i run this code under bochs - everything is good, but in real - i get random data time from time in "buffer".
where is problem?
ps: i use 0xbf during reprogramming PIC and empty handler for hdd IRQ. i thing this doesn't matter for my problem.
if possible - answer to asm(dog)uinc.ru