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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.
What is dynamic memory allocation? The mechanism of allocating needs amount of memory at run time is known as dynamic allocation of memory. Sometimes it is needed to allocate m
DATA SEGMENT NUM1 DB 15h; First number NUM2 DB 20h; Second number RESULT DB? ; Put sum here CARRY DB? ; Put any carry he
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What are the two ways of constructing a larger module to mount flash chips on a small card? The two ways are:- a) Flash cards b) Flash drivers.
Execution of a program in CPU is completed employing different set of registers and their individual circuitry. As CPU registers are used for execution of interrupt service routine
There are various limitations of primary memory like limited capacity which is its not enough to store a very large volume of data and volatility which is when power is turned off
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