interrupt hooking in linux

fuzzyBuzz · 09-21-2005, 05:34 PM

hello,

does anyone know how interrupt hooking in linux is done?

i am trying to write a module which alters the interrupt descriptor table (idt) and sets the entries to point to my own interrupt handlers.

can anybody help me with this? i don't even know where to start.
what files in the source have code that deals with assignment to the idt?

thanks in advance,
zvi

jailbait · 09-21-2005, 06:20 PM

"what files in the source have code that deals with assignment to the idt?"

I found a structure which describes the idt. I am not sure whether this particular structure allocates the idt or just maps the idt as allocated by another routine.

In file /usr/src/kernel/arch/i386/kernel/traps.c the idt is mapped or allocated by:
struct desc_struct idt_table[256].

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Steve Stites