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Format of BIOS switch-to-protected-mode Global Descriptor Table

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Offset Size Description

00h

8 BYTEs

null descriptor (initialize to zeros)

08h

8 BYTEs

GDT descriptor (see #00501)

10h

8 BYTEs

IDT descriptor

18h

8 BYTEs

DS descriptor

20h

8 BYTEs

ES

28h

8 BYTEs

SS

30h

8 BYTEs

CS

38h

8 BYTEs

uninitialized, used to build descriptor for BIOS CS