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Q. How does the distinction among kernel mode and user mode function as a rudimentary form of protection (security) system?
Answer: The distinction among kernel mode and user mode provides a rudimentary form of protection in the following manner. Certain instructions could be executed merely when the CPU is in kernel mode. Likewise hardware devices could be accessed only when the program is executing in kernel mode. Control over when disrupt could be enabled or disabled is also possible only when the CPU is in kernel mode. Therefore the CPU has very limited capability when executing in user mode thereby enforcing protection of critical resources.
What are batch systems? Early computers were physically huge machines run from a console. The general input devices were card readers and tape drivers. The common output device
operating systems and its types together with its design issues and their examples.
Inverted page table In page table the page table has one entry for every page that the process is using. The operating system must translate this reference into a physical memo
What are files and explain the access methods for files? File definition Attributes, operations and types Direct access Sequential access with diagram Other access
factors that influences layout
Q. We have an OS (operating system) for a machine that uses base and limit registers however we have modified the machine to provide a page table. Can the page tables be set up to
What is Demand paging? Virtual memory is commonly executed by demand paging. In demand paging, the pager brings only those essential pages into memory instead of swapping in a
Define Ageing Ageing is a method of enhancing the priority of process waiting in Queue for CPU allocation
difference between process and thread
what is the operating cycle in vegetable growing?
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