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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.
Develop a regular expression for Integer and Identifier (i) A regular expression for integer is [+ | -] (d)+ (ii) A regular expression for identifier is l(l | d)*
Explain Host function Host function: accepts name of floating-point guest function with single floating-point argument as its first argument, evaluates this function at x (the
Q. Explain about Open System? The 'Open System' is a system within its environment. It receives input from environment as well as provides output to environment. Illustrati
Power pc h bus
Give the formula for the average access time experienced by the processor in a system with 2 levels of caches. Ans: Formula is for the average access time experienced by the pr
Explain the term- Hacking Use of passwords and ids to prevent illegal access to files. Also locking the computer itself or locking computer room can help here. Encryption s
Sometimes it is nice to place layers in groups. It makes them simple to organize when you have lots of them. It also means you can simply apply the similar effect to lots of layers
Define variants of Turing Machine? Variants are Non deterministic turing machine. Mutlitape turing machine. Enumerators
A component can handle its own events by executing the needed event-listener interface and adding itself as its own event listener.
Q. Explain Passing Parameters Using Pointers ? This method overcomes the drawback of using variable names directly in procedure. It uses registers to pass procedure pointers to
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