Specifications
104 AMD Geode⢠GeodeROM Functional Specification
System Services
32087C
12.1.1.2 Subfunction 01h - Enable A20 Gate
Description:
Enables the A20 functionality.
Passed:
Returns:
Related Functions:
None.
12.1.1.3 Subfunction 02h - Get A20 Gate Status
Description:
Retrieves the current status of A20 gate.
Passed:
Returns:
Related Functions:
None.
Parameter Description
AH C0h
AL 01h
Parameter Description
CF 0 = Success
1 = Failure
AH 00h if successful
01h if keyboard is in secure mode
Parameter Description
AH C0h
AL 02h
Parameter Description
CF 0 = Success
1 = Failure
AH 00h if successful
01h if keyboard is in secure mode
AL 00h if A20 gate is disabled
01h if A20 gate is enabled
CX 00h