Arm Architecture: Memory Model and Barriers [Author's Lecture Part 3-3]

<Notice>

1. Issuing a 30% discount coupon to celebrate surpassing 300 students

To celebrate surpassing 300 students (Parts 1 and 2), we are issuing a 30% discount coupon. Thank you. Limited to the first 200 people.

• 30% Discount Coupon Link: https://inf.run/wZG5U

2. Roadmap Guide 🎯

This lecture <Arm Architecture: Memory Model and Barrier [Author's Lecture Part 3-3]> is included in the roadmap'Arm for System Software Developers - advanced course'.

If you wish to learn the Arm architecture (Armv8-A, Armv7-A) systematically, it is recommended to utilize the roadmap (30% discount on all lectures). For your reference, the Arm Architecture Roadmap (complete series by the author) consists of two parts: Basic Course and Advanced Course.

In modern system software,
the most important Arm architecture

Arm processors used in smartphones, AI SoC system semiconductors, electric vehicle Automotive (autonomous driving, infotainment), cloud servers, and MacBooks are all Armv8-A based 64-bit Cortex-A processors (Cortex-A53, Cortex-A57, Cortex-A72, etc.). Currently, the Armv8-A architecture can be seen as the area requiring the most foundational knowledge in the system software industry.

The first step to becoming an advanced system SW developer!
Understanding memory management methods🙋‍♂

However, to become an advanced system software developer, you must have a good understanding of how memory is managed, which is one of the key features of the Arm architecture. The core of memory management consists of the 'virtual memory system', 'cache operation principles', and 'memory models and barriers'.

Why should we learn about 'Memory Models and Barriers'?

1⃣ First, if you have a good understanding of memory models and barriers, you can develop device drivers effectively. Most device drivers control peripheral devices using the memory-mapped I/O method, and the memory model (Normal Memory, Device Memory) covers device memory—the foundation of the memory-mapped I/O method—in detail.

2⃣ Second, you must have a good understanding of device memory (one of the memory models), which is the foundation of memory-mapped I/O, to excel at programming that efficiently controls the hardware constituting system semiconductors. This is because most system semiconductors (fabless) design independent modules (IP) that make up the system semiconductor through the memory-mapped I/O method.

3⃣ Third, if you have a good understanding of memory models and barriers, you can grasp the internal operating principles of Arm processors in detail. In particular, you will often encounter situations where barriers are used to solve concurrency issues in multi-core systems, and 'memory models and barriers' can serve as the foundational knowledge.

4⃣ Fourth, you must have a good understanding of 'Memory Models and Barriers' to perform well in technical interviews for system software development. Questions related to memory reordering and memory-mapped I/O are among the most frequent topics in interviews for experienced developers.

A lecture by the author, featuring the know-how of a system engineer with 12 years of experience!

'Structure and Principles of Arm Architecture for System Software Development' (Chapter 17) covers 'Memory Models and Barriers' in detail. We hope you grow further as a system software developer through this author-led lecture.

What you will learn

Introduces the types of memory models defined in the Arm architecture and normal memory.

We introduce the types of memory models (Normal Memory and Device Memory) while analyzing the Arm specification documents in detail.

We will explain Device Memory, which is a Memory-Mapped I/O interface, in detail and review the Memory-Mapped I/O of the BCM2711 (used in Raspberry Pi).

Analyze the memory-mapped I/O interface through debugging (Crash-Utility).

Introduce barriers and explain examples of barriers in detail.

Explains the scope of barrier application and data consistency in multi-core systems.

It explains in detail how barriers are utilized in the actual Linux kernel and XEN hypervisor.

Based on my experience writing books and lecturing,
deeper and more detailed than anyone else!

I am the unprecedented author in the domestic system software field who has written books on both the 'Arm Architecture (Armv8-A, Armv7-A)' and the 'Linux Kernel'. I am also a working developer who is most well-versed in the latest system software trends (electric vehicles, system semiconductors - system software), and an educator who is most actively engaged in spreading knowledge within the system software field.

• Author of 'Structure and Principles of Arm Architecture for System Software Development' (2024, National Academy of Sciences Outstanding Book Award)

• 'The Structure and Principles of the Linux Kernel Learned Through Debugging' (2021, National Academy of Sciences Excellent Scholarly Book Award) Author

• Main Instructor for 'Programmers Dev Course: Linux System and Kernel Expert'

• June 2022, Korea Computer Congress (KCC2022) - Tutorial Presentation [Conquering the Linux Kernel Using ftrace]

• LG Electronics 'Linux Kernel' and 'Armv8 Architecture' Internal Instructor (Including domestic and overseas developers) - (2020~2024)

I can confidently say that I am an educator who can explain the key features of the Arm architecture (Armv8-A, Armv7-A) better than anyone else in Korea.

Vivid course reviews left by learners

<Structure and Principles of Arm Architecture for System Software Development - Part 1/2 Author-led Lecture>

Notes before taking the course