CITS2002 Systems Programming 1 next ¡ú CITS2002 CITS2002 schedule Welcome to CITS2002 Systems Programming The unit explores the role of contemporary operating systems and their support for high-level programming languages, how they manage efficient access to computer hardware, and how a computer’s resources may be accessed and controlled by the C programming language. The unit […]
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CITS2002 Systems Programming 1 next ¡ú CITS2002 CITS2002 schedule An Overview of Computer Hardware Any study of operating systems requires a basic understanding of the components of a computer system. Although the variety of computer system configurations is forever changing, as (new) component types employ different standards for their interconnection, it is still feasible to
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Question 1 Computer Systems (a) You are building a system that records student marks in an in-memory data struc- ture. It is important that the system works efficiently and correctly for multiple concurrent users. There are 2 classes of operation: recording a mark for a student and generating a report of a student’s marks. Whenever
Boolean Algebra • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; } • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 lw $15, 0($2) lw $16, 4($2) sw $16, 0($2) sw $15, 4($2) jr $31 • Machine
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How to Start a Program Complier, Assembler, Linker, and Loader Mc OMP273 1 • Compiler • Assembler • Linker • Loader Outline Mc OMP273 2 Steps to Starting a Program COMPILER ASSEMBLER LINKER LOADER Memory foo.c C Program source code foo.s Assembly program foo.o Object (machine language module) lib.o Library (similar to object file) a.out
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Binary Representations Integers The Big Picture • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; } • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 C compiler lw $15, lw $16, sw $16, sw $15, jr $31
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Binary Representations Real Numbers • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 C compiler The Big Picture } lw $15, lw $16, sw $16, sw $15, jr
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COMP273 McGill 1 Binary Representations + Introduction to MIPS • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; } • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 C compiler The Big Picture lw $15, lw $16,
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Input/Output: Polling and Interrupts • I/OBackground • Polling • Interrupts Outline Anatomy: 5 components of any Computer Computer Keyboard, Mouse Disk (where programs, data live when not running) Display, Printer Processor (active) Control (“brain”) Datapath (“brawn”) Memory (passive) (where programs, data live when running) Devices Input Output Motivation for Input/Output • I/Oishowhumansinteractwithcomputers • I/O gives
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Binary Representations Integers • High-level language program (in C) swap (int v[], int k) { int temp = v[k]; v[k] = v[k+1]; v[k+1] = temp; • Assembly language program (for MIPS) swap: sll $2, $5, 2 add $2, $4,$2 C compiler The Big Picture } lw $15, lw $16, sw $16, sw $15, jr $31
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