Implementing protection with virtual memory, Computer Engineering

Assignment Help:

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).

  • Provide mechanism where the CPU may go from user mode to supervisor mode (accomplished by a system call exception) and vice versa (return from exception instruction).

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.

 


Related Discussions:- Implementing protection with virtual memory

How testmanager manage test logs, When a robot scripts runs the output make...

When a robot scripts runs the output makes a test log. Test logs are managed now is the TestManager application. Rational now permits you to classify your logs into any type of for

Implementing protection with virtual memory, Implementing Protection with V...

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

Set up the minunit test framework - mortgage code, Set up the minunit test ...

Set up the minunit test framework examples in your environment (i.e. build or compile the code). Once you can run the example, use the minunit test framework to create and run a bo

What is the significance of asp.net routing, ASP.NET MVC uses ASP.NET routi...

ASP.NET MVC uses ASP.NET routing, to map incoming browser requests to controller action process. ASP.NET Routing makes use of route table. Route table is formed when your web appli

What is sorted linked list, Linked list means node which is linked each oth...

Linked list means node which is linked each other with  a line. It means that every node is connected with another one. Every node of the list hold the reference of the next node.

Write a program that finds the minimum total number of shelv, Write a progr...

Write a program that finds the minimum total number of shelv, C/C++ Programming

Design a 32:1 multiplexer, Design a 32:1 multiplexer using two 16:1 multipl...

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

State about movable joystick, State about movable joystick In another t...

State about movable joystick In another type of movable joystick, the stick is used to activate switches that cause the screen cursor to move at a constant rate in the selected

Marked statement is implemented , Consider the ReadRear Java method (a)...

Consider the ReadRear Java method (a) Illustrate pictures that explain the data structure every time a checkpoint is reached for the problems of sizes one, two, three and four s

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd