8. Descriptor Management Services, Continued

8.12 Set Descriptor

This function copies an eight byte buffer into the descriptor table entry for a specified descriptor.

To Call

     AX = 000Ch
     BX = Selector
     ES:(E)DI =  Pointer to  an 8 byte  buffer that contains
          descriptor

Returns

     If function was successful:
     Carry flag is clear.

     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 invalid.
• Your program should only modify descriptors that were allocated through the Allocate Descriptors function.
• 32-bit programs must use ES:EDI to point to the buffer. 16-bit programs should use ES:DI.
• The type byte (byte 5) follows the same format and restrictions as the access rights/type parameter (in CL) to Set Descriptor Access Rights. The extended type byte (byte 6) follows the same format and restrictions as the extended access rights/type parameter (in CH) to Set Descriptor Access Rights, except the limit field may have any value, except the low order 4 bits (marked "reserved") are used to set the upper 4 bits of the descriptor's limit.