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ArchAdept Training

Barriers 101: Bundle

The complete Barriers 101 training course, a comprehensive deep dive on barriers in the Arm® Architecture. Explore the rules underpinning Arm's weakly-ordered memory model. Learn how to use barriers to manually enforce ordering. Step through real examples of how barriers work in hardware. Visualize accesses flowing through the interconnect. Gain confidence tackling unfamiliar barrier scenarios from first principles.

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Barriers 101: Part 1

Standalone Part 1 of our comprehensive training course on Barriers in the Arm® Architecture. Discover why Arm defines a weakly-ordered memory model. Explore the rules dictating whether two memory accesses are permitted to be reordered. Learn how to use barriers in software to manually enforce ordering. Experiment with descoping barriers to minimise any potential impacts on system performance.

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Barriers 101: Part 2

Standalone Part 2 of our comprehensive training course on Barriers in the Arm® Architecture. Discover how AMBA®-based cache coherent interconnects work. Explore how Shareability domains are defined in hardware. Learn how barriers really work, both when they're being broadcast onto the interconnect for it to handle on behalf of the CPU and when they're being handled internally to the CPU based on completion responses.

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Barriers 101: Part 3

Standalone Part 3 of our comprehensive training course on Barriers in the Arm® Architecture. Discover why Data Memory Barriers are not always sufficient to guarantee ordering. Explore how to use other barriers to enforce ordering in those situations. Learn how Arm formally defines ordering relationships in its weakly-ordered memory model. Learn how to test for missing barriers under simulation.

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Barriers 101: Part 4

Standalone Part 4 of our comprehensive training course on Barriers in the Arm® Architecture. Discover how speculative side-channel attacks like Spectre and Meltdown work. Explore how to use barriers to control speculation. Learn how to correctly use barriers to perform break-before-make sequences when modifying the page tables so as to prevent all kinds of nasty, horribe-to-debug issues.

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Testimonials

We're proud to maintain a 100% 5⭐️ rating on platforms like Udemy; see what our happy learners are saying:

"I especially appreciated the practical insights and real-world examples. [...] It's a must-watch for anyone working close to hardware or writing low-level Arm code."

Sidraya J.

"In my opinion this is one of the strengths of Ash‘s way of teaching, which makes it easy to follow, even if there is no prior knowledge present."

Matthias R.

"The material is presented with precise and thoughtful wording. [...] The instructor does a great job of breaking down complex concepts into a logical, easy-to-understand flow."

Dawid B.

Thank you for your courses. [...] Now I can study thinking, “Wow, barriers are cool - that’s why they built it this way,” instead of, “What else should I read to finally understand how it works?”