581305-6 Computer Organization I                                (toisella puolella suomeksi )
course examination 6.9.2002  (Open Univ.)

1. [12 p] Process.
   1. [2 p] Define concept prosessi. How does it differ from program?
   2. [2 p] What is the representation of a process is system? What data is in it? Where is it located?
   3. [2 p] What is a system process? How does it differ from ordinary process?
   4. [2 p] What happens in the system during process switch? What happens to the previous process?
   5. [2 p] Give an example of a situation where process state changes from "Running" to "Ready-to-Run"?
   6. [2 p] Give an example of a situation where process in state "waiting" changes first to state "Ready-to-Run" and then immediately to state "running".
      
      
      
2. [12 p] Instruction execution.
1. [2 p] How is ttk-91 instruction "ADD  R2, VarX(R1)" represented in memory?
2. [4 p] What happens in the processor during machine instruction "ADD  R2, VarX(R1)" execution in different phases of the exection cycle?
3. [3 p] Define concept interrupt (exception). What type of interrupts are there? How are interrupts handled in the processor?
4. [3 p] What interrupts can occur during the execution of machine instruction "ADD  R2, VarX(R1)"?
   
   
   
   
3. [12 p] Java
   1. [3 p] What is common in executing Java-programs with executing ttk-91 programs in Koksi simulator?
   2. [3 p] What is different in executing Java-programs with executing ttk-91 programs in Koksi simulator?
   3. [3 p] What is Java Virtual Machine (JVM)? Why is it important?
   4. [3 p] How does JVM differ from ordinary processors (E.g., Intel Pentium, IBM PowerPC, AMD Athlon)?
      
      
      
4. [12 p]  Implementation of subroutines/functions 
   1. [3 p] How are subroutines implemented at machine language level? What aspects are important in subroutine implementation?
   2. [1 p] What is special in implementing recursive subroutines?
   3. [4 p] Function Aver(A, B, C, D) returns as its value the average of for integer values given to it as parameters.
      The parameters are all call-by-value parameters.  Give in Ttk-91 symbolic assembly language a program, that  (i) reads four interger values, (ii) computes the average of those values with function Aver,  and (iii) finally prints out the average.
   4. [4 p] Implement the function Aver(A, B, C, D) given in part (c) with ttk-91 symbolic assembly language.

Follow the subroutine (function) implementation and call mechanism introduced in lectures and in practice sessions.