Segment tables in computer graphics includes the length of corresponding segments in main memory. Each entry in the table contains the lengths, and to see if a segment is already in main memory, a bit is usually needed.
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Each process running on a processor needs its own logical address space. This can only be realized if each process has its own page table. To support this, a processor that supports virtual memory must have a page table base register that is accessible by the operating system. For operating system security, this register is only accessible when the processor is in system mode. The operating system maintains information about each process in a process control block. The page table base address for the process is stored there. The operating system loads this address into the PTBR whenever a process is dispatched.
There are basically four types of operating systems. They include Batch Operating System, Multiprogramming Operating System, Network Operating System and Distributed Operating System.
1) Pass parameters using registers(directly). 2) Store the parameters in a table in memory and the table address is passed in a register to the OS. 3) Push(store) the parameters onto a stack(by the program) and "pop" off by the Operating System.
1. BATCH PROCESSING operating system 2. MULTIPROGRAMMING operating system 3. TIME SHARING operating system 4. REAL TIME operating system 5. DISTRIBUTED operating system
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