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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.
Write the truth table for a clocked J-K flip-flop that is triggered by the positive-going edge of the clock signal. Explain the operation of this flip-flop for the following condit
Q. Design the counter using sequential logic with following counting sequence using RS- flip-flops. 000, 100, 101, 111, 010, ... ... ... ... ... ... ... ... ... ...
Q. Execute a reduce operation over members of specified group? int info = pvm_reduce( void (*func)(), void *data, int count, int datatype, int msgtag, char *group, int root
how it is calculated?
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please suggest me ,how to write microopertions,and study for computer architecture
'On many systems, you can describe a function matherr which will be known as when there are certain floating-point errors, like errors in the math routines in .
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