This is the course exam for lecture course Autumn 2015. This exam can not be used as final exam.
Question 4 is also miniexam 4.
Questions 1-3 are also make-up exams for miniexams 1-3.
Write in each answer sheat your name and signature, student id number, and course name.
It is sufficient to give 1-2 page answer to each question.
Please write the answer for each problem on its own sheet and return it in its own pile!
- [10 p] System structure, CPU, bus
- [5 p] In address 124 there is the next instruction "JNZER R1, JumpTable(R1)" to execute.
How do the contents of registers PC, R1, IR, SR, MAR, MBR and TR change during the fetch-execute cycle for this instruction?
- [3 p] What are the interrupts and what are they needed for? How are they implemented in the fetch-execute cycle? Give a conrcrete machine language level example, relating to an interrupt occurring during the execution of instruction "JNZER R1, JumpTable(R1)". What type of interrupt does your example use?
- [2 p] Why do you need the privileged execution mode for the processor? How does it differ from normal execution mode? How is it in in practice implemented in the fetch-execute cycle?
- [10 p] Data representation and correctness, memory
- [1 p] What is the 16-bit two's complement Big-Endian representation of integer value -13 at byte address 0x11AABB00? What bits in what byte?
- [1 p] Like part (a), but with 8-bit representation.
- [1 p] Like part (a), but with Little-Endian representation.
- [3 p] What is the 32-bit IEEE floating point standard representation?
- [1 p] What is the 32-bit IEEE floating point standard representation for -4.50?
- [3 p] Which problem is solved with Hamming code, and how is it done (just main principles)?
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[10 p] Operating systems, external memory, I/O
- [3 p] Give an example on an event E, which results in moving a ready-to-run (ready) process P to running state. How is the move done?
What happens to process Q, that was running when event E occurred?
- [3 p] It is important for the overall system that the operating system will get its turn to execute every now and then, and always when needed. How is this implemented?
- [4 p] How is the interrupt driven I/O (indirect I/O) implemented?
How do the device driver DD and device controller process DCP running on the device controller communicate with each other during (interrupt driven) I/O?
How and when does the DCP know what DD wants it to do?
How and when does the DD know that the DCP has completed the task given to it?
- [10 p] Compilation, linking, loading, interpretation, emulation
- [1 p] What is Java virtual machine (Java VM, JVM)?
- [3 p] P is a program written in Java. How do you execute P with interpretation?
What is P's representation at execution time, and how is it obtained?
What advantage interpretation has as compared to (ordinary) compilation?
- [3 p] P is a program written in Java. How do you execute P with (ordinary) compilation (translation)? What is P's representation at execution time, and how is it obtained?
What advantage compilation has as compared to interpretation?
- [3 p] P is a program written in Java. How do you execute P with JIT-compilation?
What is P's representation at execution time, and how is it obtained?
What advantage JIT-compilation has as compared to ordinary compilation?