Further no GDT can have a size of 0. PAE) and the virtual address bits supported by the processor (current AMD64 processors support up to 48 … If using a hardware-managed TLB, the TLB is responsible for traversing the page table structure; it only raises an exception if the page table has not yet been properly configured. The most important element, and one that should be present for every table, is the table heading th tag. If another process were to run in our example above, the OS would have to manage a different page table for it, as its virtual pages obviously map to different physical pages (modulo any sharing going on). One for the page table and one for the data/instruction." The table contains 8-byte entries. The TLB is associative, high speed memory. structure (most page table structures we discuss are per-process struc-tures; an exception we’ll touch on is the inverted page table). Since the page table entry is 0x1, the hardware looks at entry 1 of the page table at 0x80000000, which tells it that the physical page is located at address 0x0000C * 4K = 0x0000C000. A page table is the data structure used by a virtual memory system in a computer operating system to store the mapping between virtual addresses and physical addresses.Virtual addresses are used by the program executed by the accessing process, while physical addresses are used by the hardware, or more specifically, by the RAM subsystem. The offset is the linear address of the table itself, which means that paging applies. The OS maintains a segment map table for all the processes. This is because the maximum value of size is 65535, while the GDT can be up to 65536 bytes (a maximum of 8192 entries). Page table is kept in main memory" Page-table base register (PTBR) points to the page table" Page-table length register (PRLR) indicates size of the page table" In this scheme every data/instruction access requires two memory accesses. This tag is used in place of the td tags in the first row to identify entries that should be used as column headings.. Segmentation method works almost similarly to paging, only difference between the two is that segments are of variable-length whereas, in the paging method, pages are always of fixed size. Each entry in TLB consists of two parts: a tag and a value. Adding Structure to a Table. If page table contain large number of entries then we can use TLB(translation Look-aside buffer), a special, small, fast look up hardware cache. A program segment includes the program's main function, data structures, utility functions, etc. The size is the size of the table subtracted by 1. Implementation of Page Table! There are additional elements we can use to add semantic meaning to the data in our table. Each entry has a complex structure: The size of a page depends on the processor mode (protected, compatibility or long mode), the extensions used (e.g. This is the second RAM access of the process. This means that when the OS context switches to … The page tables (or page map levels) are used to map each virtual page to a corresponding physical page.Zero or more virtual pages can correspond to the same physical page. Recall that each process has its own address space, and thus its own page table.