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Trace: • Overall View on Computer Architecture: Processor, Memory, I/O, Buses • Fundamentals of Addressing Modes • Specific Elements of the x86 and x64 Architectures • Interrupt Controller, Interrupts

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en:multiasm:papc:chapter_6_2 [2026/05/27 09:56] – [Segmented addressing in real mode] ktokarzen:multiasm:papc:chapter_6_2 [2026/05/27 09:58] (current) – [Segmented addressing in protected mode] ktokarz
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-Although segmentation allows for advanced memory management and the implementation of memory protection, none of the popular operating systems, including Windows, Linux or MacOS, ever used it. In Windows, all segment registers, via descriptors, point to the zero base address and the maximal limit, resulting in the flat memory model. In this approach, the segmentation de facto does not function. Memory protection is implemented at the paging level. The flat memory model is shown in the Fig {{ref>ia32flat}}.+Although segmentation allows for advanced memory management and the implementation of memory protection, none of the popular operating systems, including Windows, Linux-based, or MacOS, has ever used it. In Windows, all segment registers, via descriptors, point to the zero base address and the maximal limit, resulting in the flat memory model. In this approach, the segmentation de facto does not function. Memory protection is implemented at the paging level. The flat memory model is shown in the Fig {{ref>ia32flat}}.
  
 <figure ia32flat> <figure ia32flat>
en/multiasm/papc/chapter_6_2.1779865010.txt.gz · Last modified: by ktokarz
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