IDT question
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SystemHalted
IDT question
Ive been reading tutorials on IDTs IRQs and ISRs now all I need is to know how to put my ISRs into the ITDs. Please Help.
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Xenos
RE:IDT question
You need segment:offset of each ISR to create IDT entries. Each IDT entry is 8 bytes long (it starts, say at my_idt_entry). Put the lower word of the ISR offset to [my_idt_entry], the higher word to [my_idt_entry+6]. The segment goes to [my_idt_entry+2]. The word at [my_idt_entry+4] contains information about what kind of descriptor it is. Put 0x0e00 here for an interrupt gate (IF is cleared automatically on entry, nice for IRQs) or 0x0f00 for a trap gate (IF is not cleared, used for traps like int3 etc.). That's it!