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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.
Remote Login A login that permits a user terminal to connect to a host computer by a network or direct telecommunications link, and to interact with that host computer as if t
How many flip flops are required to construct a decade counter ? Ans. 4 FlipFlop's are required because decade counter counts 10 states from 0 to 9 (that is from 0000 to 1001).
#what is the history of computer science
Q. Initialize new PVM processes? pvm_spawn( char *task, char **argv, int flag, char *where, int ntask, int *tids ) Initialize new PVM processes. Task a character st
An 8-bit successive approximation ADC has a resolution of 20mV. What will be its digital output for an analog input of 2.17V? Ans: Given data Resolution =20mv Analog input =2.
Identifying Constraints between Objects In a system, there are few boundaries to work on. Boundaries or Constraints are functional dependencies among objects which are not con
What are the features common in most of the websites Following general features must be found on most web sites in one form or another (this list is by no means exhaustive):
Reflexes - artificial intelligence: If an agent decides upon and executes an action in response to a sensor input without consultation of its world, then this can be considere
Internal Organization of memory chip: Word line & bit lines 16x8 organization : 16 words of 8 bits per Form of an array
Perform the 23 - 48 operations using the 2's complement method. Ans. Given 23 - 48 firstly add them 23 0 1 0 1 1 1 - (- 48) +
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