GDT, LDT , IDT

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maslan

Joined: 08 Sep 2003
Posts: 54

maslan 15 Jun 2005, 16:13

hi guys
i know how to load gdt but i don't know how to do the a ldt and how the the ldt require space in gdt.
i know how to go to protected mode
so can any 1 send me a sample code that can be loaded by grub and little description about ldt ad idt in os. and what is the minumum GDT , IDT , LDT that the os should create.
thanx

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Maslan
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15 Jun 2005, 16:13

maslan

Joined: 08 Sep 2003
Posts: 54

maslan 21 Jun 2005, 11:44

ok i'm always ignored

but will make it little clear and easier
can i set an idt without creating a system descriptor in gdt, because i've a code segment with 0 base in the gdt.
can i also set it without having a TSS ?
please i need a sample function to do so .

21 Jun 2005, 11:44

Octavio

Joined: 21 Jun 2003
Posts: 366
Location: Spain

Octavio 21 Jun 2005, 13:39

maslan wrote:

ok i'm always ignored

wellcome to the assembler world Laughing

Quote:

but will make it little clear and easier
can i set an idt without creating a system descriptor in gdt

yes, you can set the idt before the gdt ,tss is not needed if you don´t use it. But before activating interrupts you need to set up the gdt
with an apropiate descriptor for the interrupts, on my OS i use the same
descriptors for interrupts and system code.

21 Jun 2005, 13:39

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