Re: Operating system design questions

From: Tauno Voipio (tauno.voipio_at_iki.fi.NOSPAM.invalid)
Date: 04/10/05

  • Next message: Bill Marcum: "Re: interrupt trouble with 8139too, r128" 
    Date: Sun, 10 Apr 2005 20:13:10 GMT

    Luka Napotnik wrote:
    >>>
    >>>1. virtual memory - "page table": does this table contain the offset
    >>>addresses of pages in physical memory or do I have to calculate the page
    >>>offsets from a formula?
    >>
    >>
    >>The page offsets go directly from linear addresses (virtual) to
    >>physical addresses. The upper bits get translated by page tables.
    >>For example, in Intel 80386+ architecture, the lowest 12 bits
    >>pass through intact and the 20 top bits will translated.
    >>
    >>Get a programmer's manual of the hardware you're going to
    >>use and look details from it.
    >>
    >
    >
    > Can I use the Linux page table for my OS? Of curse for 386.
    >

    Page table is a memory structure used by the paging hardware.
    Linux has its own, and you have to do yours, if you're
    going to make an own kernel.

    Please, get a programmer's manual to the Intel 80386+
    architecture and learn the part of memory management.

    For using protected mode, you need also learn and use
    some of the segmentation mechanism.

    A good place to start is a book of Linux kernel, e.g.

    Daniel P. Bovet, Marco Cesati, Understanding the Linux
    Kernel, 2nd ed, O' Reilly, ISBN 0-596-00213-0.

    The Linux sources show also how to start the whole
    system up. Get version 2.4 sources - there is
    a simple boot loader in arch/i386/boot/bootsect.S. 

    -- 
Tauno Voipio
tauno voipio (at) iki fi
  • Next message: Bill Marcum: "Re: interrupt trouble with 8139too, r128"

    Relevant Pages