<<< Segment Descriptor Cont.     Index     Segment Descriptor Cont. >>>

8. Segment Descriptor Cont.

  • S = 1 identifies system segment, S = 0 if application CODE or DATA segment.

  • D/B - default CODE operand size, 0 = 16 bit, 1 = 32-bit. For DATA segments specifies stack mode - via SP or ESP:

  • For code segment, D bit is default size of operands and the offset value:

    • D = 0: 16-bit values

    • D = 1: 32-bit values

  • Segment descriptor format:

      Segment descriptor format

<<< Segment Descriptor Cont.     Index     Segment Descriptor Cont. >>>