Page Tables
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Number of entries in page table is equal to the number of virtual pages.
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Number of virtual pages is the size of the virtual address space divided
by the page size.
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Each process has its own page table.
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A page table register points to the beginning of the page table for the
current process.
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A page table entry will typically contain:
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physical page number
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valid bit
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dirty bit
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use bit
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protection field (e.g. read only)
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disk address
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