8. Descriptor Management Services, Continued

8.10 Create Code Segment Alias Descriptor

This function will create a data descriptor that has the same base and limit as the specified code segment descriptor.

To Call

     AX = 000Ah
     BX = Code segment selector

Returns

     If function was successful:
     Carry flag is clear.
     AX = New data selector

     If function was not successful:
     Carry flag is set.

Programmer's Notes

• Since this function involves descriptor management, it will be rarely needed in 32-bit programs.
• This function will fail if the selector specified in BX is not a code segment or is invalid.
• Use the Free Descriptor function to deallocate the alias descriptor.
• The code segment alias descriptor will not track changes to the code descriptor. In other words, if an alias descriptor is created, and then the base or limit of the code segment is changed, the alias descriptor's base or limit would not change.