exception before start_idt

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hi:)

    i am debuging my kernel .
    Before the idt_setup of protect-mode , Is it normal that one page_fault exception occures?

    As I step into this  instruction : lss stack_start,%esp , vm fire an page_fault exception,
    But at the intr vector check step, as the intr-table has not been setup . so it gives this :

                 interrupt(): vector must be within IDT table limits, IDT.limit = 0x0.

    How to resolve this issure?
thanks!
    

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