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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.
Explain network security. Network security means the security of networks and their services from unauthorized access, changes, destruction or disclosure. It gives for assuranc
Number systems Consider a decimal number: 7654.32 Short hand for: 7 * 103 + 6*102 + 5* 101 + 4*100 + 3*10 -1 + 2*10 -2 Likewise
How will this difference b interpreted? When one pointer is subtracted from another pointer, the number of elements between the two pointers always includes the element pointed
Illustrate the Purchase Consummation activity? Purchase Consummation: This model lists three activities in the purchase consummation phase: • Receipt of product. • Pl
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Super scalar architecture Pentium microprocessor is organized with three execution units. One executes floating-point instructions and other two (U-pipe and V-pipe) execute in
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Design a 32:1 multiplexer using two 16:1 multiplexers and a 2:1 multiplexer Ans. Design a 32 X 1 MUX by using two 16 X 1 MUX and one 2 X 1. Now here total 32 input lines
If the product of two integers a and b is even after that prove that either a is even or b is even. Answer: It is illustrated that product of a and b is even so let a * b = 2n.
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