Where to look for specification about GDTR & IDTR registers?

I have referred "Intel Architecture Software Developer’s Manual -Volume 1:Basic Architecture" they are NOT specified about GDTR register.

GDTR & IDTR are system registers ? then why Intel manual does not specified about these registers in detail ?

Where to look for more details about these regi开发者_C百科sters.

See Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3B: System Programming Guide, Part 2.

They are described in the volume 3A, chapter 3 (Protected-Mode Memory Management) and 6 (Interrupt and Exception Handling).

You can download the PDF at this address: Intel® 64 and IA-32 Architectures Software Developer’s Manual Volume 3A: System Programming Guide, Part 1

maybe you can download a intel 80386 programmer's reference manual, just find GDTR keyword, you will find what you need!