Practice_Question_Os_physical Addressing

Duration: 2 min

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Module outline

  1. About Course: BTSC About Course
  2. Basics of Computer Science: Basics of COA, Number System, Number Representation
  3. Operating System: Introduction to OS, Process Management, CPU Scheduling, Process Synchronization, Threads & Process Creation, Deadlock, Memory Management, Virtual Memory
  4. Data Structures & Algorithms: Introduction to DS, Array, Stack, Queue, Linked List, Tree, Graphs, Hashing, Algorithm Analysis, Time Complexity Analysis, Sorting Algorithms
  5. Database Management Systems(DBMS): Basics of DBMS, ER Diagram, Relational Model & Functional Dependencies, Keys & Integrity Constraints, Normalization (1NF - BCNF), Relational Algebra, SQL, Transaction Management, Concurrency Control, Database Recovery
  6. Networking and Internet: Introduction to CN, Data Communication, Net Layer: IPv4 & Proto, Net Layer: IP Addressing, Application Layer, Hardware Basics, Network Access Technologies, Network Security
  7. Cyber Security Basics: Cyber Threats and Malware Attacks, Role of Internet and Web Services, Electronic Data Interchange and E-Commerce, Cyber Safety and Security
  8. C Programming (Programming Fundamentals): C Fundamentals, Control Flow, Functions, Arrays & Pointers, Storage Classes, Structures & Enums, DMA, Macros, Scoping & File Handling
  9. C++, OOPs & Java (Programming Fundamentals): Java, OOPS with C++
  10. Python (Programming Fundamentals): Introduction to Python, Tokens, Variables, Data Types, I/O, Operators & Expressions, Control Flow & Looping, Collections & Strings, Functions & Modules
  11. Web Development Basics: Internet Fundamentals, Web Design & Development, Protocols & Services, Web Publishing & Hosting, Server Side & Security, Emerging Technologies, JavaScript-Basics, HTML Basics
  12. Software Engineering: Fundamentals of Software Engineering, Software Requirements and Quality Assurance, Software Design, Estimation and Metrics, Software Testing
  13. Software and Hardware Tools: MS Office Applications, Unix OS, Linux OS
  14. Emerging Trends. AI & Social Ethics: Artificial Intelligence, Emerging Tech Trends, Society, Law & Ethics
  15. Full Mock Test:
AI summary & chapters

AI Summary

An AI-generated summary of this video lecture.

The video presents a problem involving memory management in operating systems, specifically focusing on the use of relocation and limit registers to determine valid memory access. The instructor displays a table listing five processes (P0 to P4) with their corresponding Limit and Relocation register values. Below the table, a list of logical address requests from these processes is provided. The core task is to evaluate each request to determine if it is legal (within bounds) or illegal (out of bounds) and, if legal, to calculate the resulting physical address. The instructor systematically analyzes each process request, comparing the requested logical address against the process's limit register value. For valid requests, he demonstrates the calculation of the physical address by adding the logical address to the base address found in the relocation register.

Chapters

  1. 0:00 – 2:00 00:00-02:00

    The instructor begins by analyzing the first request from process P0, which is 450. He checks the limit register for P0, which is 500. Since 450 is less than 500, he marks it as legal. He then calculates the physical address by adding the logical address (450) to the relocation register value (1200), resulting in 1650. Next, he moves to P1 with a request of 300. The limit register for P1 is 275. Since 300 is greater than 275, he marks this attempt as illegal. He proceeds to P2 with a request of 210. The limit is 212, so 210 is valid. He calculates the physical address as 880 + 210 = 1090. Then, for P3, the request is 450, but the limit is 420, making it illegal. Finally, he addresses P4 with a request of 80. The limit is 118, so it is legal, and the physical address is calculated as 200 + 80.

  2. 2:00 – 2:16 02:00-02:16

    The instructor completes the calculation for process P4. He writes down the sum of the relocation register (200) and the logical address (80), resulting in a physical address of 280. He circles the final answer and briefly concludes the problem-solving session, having successfully identified the illegal attempts and calculated the physical addresses for the valid ones.

The lesson effectively demonstrates the mechanism of address binding and protection in memory management. By comparing logical addresses against limit registers, the system ensures processes do not access unauthorized memory regions. The addition of the relocation register value shifts the logical address space to the correct physical location, illustrating how dynamic relocation works in a multitasking environment.

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