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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.
Discuss the advantages of automatic switching systems over manual switching system. Automatic switching systems have some advantages over the manual exchanges: 1. In a manua
The field that contains a segment index or an internal index is called ? Ans. Target datum consists of a segment index or an internal index.
The most common type of non-volatile memory is the ROM device. This device is read only and the data is masked into the chip during manufacture. Variations of the ROM are one off p
Q. Explain about CD-ROM and DVD-ROM? Optical disks employ Laser Disk Technology that is the latest and most promising technology for high capacity secondary storage. Advent of
The most important in the project are to develop application: 1- Web Conference this will help both the jobseeker and employer to meet through web conference and follow the proc
Name the languages introduced in second generation During the time of second generation many high level programming languages were introduced, such as FORTRAN (1956),
What is dialog Module? A dialog Module is a callable sequence of screens that does not belong to a certain transaction. Dialog modules have their module pools, and can be know
The logic circuit shown in the given figure can be minimised to Ans. The minimised figure of logic diagram is D, the output of the logic circuit is as Y=(X+Y')'+(X'+(X+
aggregation in dbms?
1. The network shown in figure 2 uses neurons with: (a) Unipolar Binary; (b) Bipolar Binary. Calculate a table of responses to all four possi
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