8. Descriptor Management Services, Continued

8.13 Allocate Specific Descriptor

This function attempts to allocate a specific descriptor.

To Call

     AX = 000Dh
     BX = Selector

Returns

     If function was successful:
     Carry flag is clear.
     Descriptor has been allocated

     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 in use or is not a selector.
• Use function 0001h to free the descriptor.
• The first 10h (16 decimal) descriptors must be reserved for this function and may not be used by the host.
• If another application has already loaded then some of these descriptors may be in use.