CS 452/652 Spring 2026 - Lecture 22

Recap

July 29, 2026 prev

Recap

Hardware

• Raspberry Pi 4, Broadcom 2711, ARMv8, Cortex A72
• memory model, assembly, device access (timer, UART, SPI)
• serial communication
• CAN bus communication
• system registers, interrupt controller, exception vectors
• memory & CPU caches

Real-world Components

• Märklin tracks & trains
• control interface & quirks
• velocity and acceleration models
• failures

Systems Software

• cross compilation, linking, loading, initialization
• freestanding runtime environment
• slab allocation, free list, intrusive linkage
• ABI details
• concurrency and race conditions
• data representation

Operating System

• polling loop vs. task scheduling
• context switching: system call vs. interrupts
• scheduling, priorities, idle
• send-receive-reply message passing

Software Development

• sizable software system
• full control and responsibility
• challenging development environment
• optimization
• performance & measurements
• experimentation

Software Design & Control

• server & worker patterns
• layered control components
• domain-specific design

Theory

• latency analysis
• priority inversion
• scheduling & admission control

Multi-Core Programming

• atomicity, critical section
• locks: Dekker's algorithm, ticket lock
• memory ordering
• sequential consistency