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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.
Define Edge-triggered S-R flip-flop Basic Symbol small triangle, called the dynamic input indicator, is used to identify an edge-triggered flip-flop. Truth Table.
Q. Reduce following to minimum literals and derive their complements. 1. [(AB)'A][(AB)'B] 2. ABC(ABC' + AB'C + A'BC) 3. (A+C+D) (A+C+D') (A+C'+D)(A+D')
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Representation in Prolog - Logic Programs: If we justimpose some additional constraints on first-order logic, so than we get to a representation language knowing as logic prog
Memory - management mode System memory-management mode (SMM) is on the same level as protected mode, real mode and virtual mode though it is provided to function as a manager
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