Function 62, subfunction 2 - get mechanism of addressing to the PCI configuration space.
Parameters:
- eax = 62 - function number
- bl = 2 - subfunction number
Returned value:
- eax = -1 - access to PCI is disabled; otherwise
- al = mechanism (1 or 2); other bytes of eax are destroyed
Remarks:
- Previously low-level access to PCI for applications must be
enabled by subfunction 12 of function 21.
- Addressing mechanism is selected depending on
equipment characteristics.
- Subfunctions of read and write work automatically
with the selected mechanism.