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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.
Basic logic gates Introduce the basic logic gates in terms of a) their function, b) their circuit symbol, c) their truth table and d) their equivalent in Boolean a
Problem (a) Forensic methodology consists of three phases. Briefly explian these three phases. (b) Sometimes it's best not to perform hard-disk acquisition. Provide two
A logic gate is an electronic circuit that generates a typical output signal which depends on its input signal. Output signal of a gate is a general boolean operation of its input
Distinguish between combinational logic circuits and sequential logic circuits. Ans: Combinational logic circuits:- (i) Outputs only depend upon present state of the i
Make a page translation table the meets the requirements of the virtual memory system given below. Suppose page (and frame) sizes of 20 with pages 0 by 3 in logical memory and fra
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Q. What are cosmic rays? The ionising radiation several times stronger than γ-rays entering the earth from all the directions from cosmic or interstellar space is known as cosm
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