114 lines
4.9 KiB
HTML
114 lines
4.9 KiB
HTML
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<title>MyOS Kernel: Format of a paging structure entry</title>
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<div class="title">Format of a paging structure entry </div> </div>
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<div class="contents">
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<div class="textblock"><p>The format of a page table/directiry entry is as following: <br />
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Bits 31-11 is the physical frame number the entry points to. <br />
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Bits 11-9 are availible for use by the OS. <br />
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Bit 8 is ignored. <br />
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Bit 7 is the page size in page directories, and must be 0 in page tables. If set to 1 in a page directory, it indicates 4MB pages. <br />
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Bit 6 is the dirty bit in page tables, and must be 0 in page directories. In page tabes, it is set to 1 by the CPU when the page is written to. <br />
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Bit 5 will be set to 1 by the CPU when the page is accessed. <br />
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Bit 4 indicates whether the page has it's cache disabled. <br />
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Bit 3 indictates whether write-through caching (when it is 1), or write-back caching, (when it is 0) is enabled. <br />
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Bit 2 indictaes whether user mode code can access the page. <br />
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Bit 1 indicates whether the page is writable. <br />
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Bit 0 indicates whether the entry is present. If it is 0, the CU ignores the other 31 bits of the entry. <br />
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Privlege bits in the entries are ANDed together, so the most restrictive privlege between the page directory and the page table wins. </p>
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.18 </li>
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