Specifications

AMD Geode™ GeodeROM Functional Specification 127
System Services
32087C
12.1.6 Function 88h - Get Extended Memory Size
Description:
Returns the amount of memory, above 1 MB, in the system. The nature of this interface limits it to reporting 65 MB total
in the system.
Passed:
Returns:
Related Functions:
None.
12.1.7 Function 89h - Enter Protected Mode
Description:
Forces the system into protected mode. The caller must construct a GDT (Global Descriptor Table) to be used by the
BIOS.
Passed:
Returns:
Related Functions:
None.
Parameter Description
AH 88h
Parameter Description
CF 0 if operation completed successfully
1 if operation failed, AH contains error codes
AX Amount of continuous memory starting at an absolute address of 100000h
AH Status:
86h = Unsupported Function
Parameter Description
AH 89h
BL Interrupt number for IRQ0
BH Interrupt number for IRQ8
ES:SI Pointer to GDT (see Table 12-2 "Global Descriptor Table (GDT)" on page 128)
Parameter Description
CF 0 if operation completed successfully
1 if operation failed, AH contains status codes
AH Status:
00h = Successful
FFh = Error enabling A20
BP May be destroyed