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Format of global descriptor table

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Offset Size Description

00h

16 BYTEs

zeros (used by BIOS)

10h

WORD

source segment length in bytes (2*CX-1 or greater)

12h

3 BYTEs

24-bit linear source address, low byte first

15h

BYTE

source segment access rights (93h)

16h

WORD

(286) zero
(386+) extended access rights and high byte of source address

18h

WORD

destination segment length in bytes (2*CX-1 or greater)

1Ah

3 BYTEs

24-bit linear destination address, low byte first

1Dh

BYTE

destination segment access rights (93h)

1Eh

WORD

(286) zero
(386+) extended access rights and high byte of destination address

20h

16 BYTEs

zeros (used by BIOS to build CS and SS descriptors)