Using Windows Uses A Flat Memory Model - 1746 Words

Each process started on x86 version of Windows uses a flat memory model that ranges from 0x00000000 – 0xFFFFFFFF. The lower half of the memory, 0x00000000 – 0x7FFFFFFF, is reserved for user space code.While the upper half of the memory, 0x80000000 – 0xFFFFFFFF, is reserved for the kernel code. The Windows operating system also doesn’t use the segmentation (well actually it does, because it has to), but the segment table contains segment descriptors that use the entire linear address space. There are four segments, two for user and two for kernel mode, which describe the data and code for each of the modes. But all of the descriptors actually contain the same linear address space. This means they all point to the same segment in memory that is 0xFFFFFFFF bits long, proving that there is no segmentation on Windows systems. Let’s execute the â€Å"dg 0 30† command to display the first 7 segment descriptors that can be seen on the picture below: Notice that the 0008, 0010, 0018 and 0020 all start at base address 0x00000000 and end at address 0xFFFFFFFF: They represent the data and code segments of user and kernel mode. This also proves that the segmentation is actually not used by the Windows system. Therefore we can use the terms†virtual address space† and â€Å"linear address space† interchangeably, because they are the same in this particular case. Because of this, when talking about user space code being loaded in the virtual address space from 0x00000000 to 0x7FFFFFFF, we’reShow MoreRelatedComputers Now Essay1044 Words   |  5 Pagesmaintain a solid working environment. Ideally, the computer should have the most recent computer build including a dual core processor with the highest amount of memory available to handle designs as well as animation. 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