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Implementing Protection with Virtual Memory - computer architecture:
To enable the operating system to implement protection in the VM system, the HW have to:
I. Support at least 2 modes that denoted whether the running process is a user process (executive process) or an operating system process (kernel/supervisor process).
II. Provide a part ion of the CPU state that a user process may read but not write (includes supervisor mode bit).
o Only operating system process may change page tables. Page tables are held in operating system address space thereby preventing a user procedure from changing them.
o When processes desire to share information in a restricted way, the OS have to assist them.
o The write access bit (in both the TLB and the page table) can be used to limit the sharing to only read sharing.
Necessary features of an algorithm: 1.Input: The algorithm should take zero or more input. 2. Output: The algorithm should generate one or more outputs. 3. Definiteness:
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Explain characteristics of program translation model. The program translation model characteristics are: A program should be translated before this can be executed.
Take the following flow graph and use the procedure in chapter 8 to derive an equivalent regular expression. Show all intermediate graphs (to ensure that you follow the procedure,
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