Allocate LDT Descriptors

Allocates one or more descriptors in the task's Local Descriptor Table (LDT). The descriptor(s) allocated must be initialized by the application with other function calls.

Call With

AX = 0000H
CX = number of descriptors to allocate

Returns

if function successful
Carry flag = clear
AX = base selector

if function unsuccessful
Carry flag = set
AX = error code

8011H descriptor unavailable

Notes

If more than one descriptor was requested, the function returns a base selector referencing the first of a contiguous array of descriptors. The selector values for subsequent descriptors in the array can be calculated by adding the value returned by Int 31H Function 0003H.
The allocated descriptor(s) will be set to "data" with the present bit set and a base and limit of zero. The privilege level of the descriptor(s) will match the application's code segment privilege level.
Refer to the rules for descriptor usage in Appendix D.