READLIST

The full x86/x86-64 ISA reference. Volumes 1–4. Essential if you're doing anything at the instruction level, writing a JIT, or just want to understand what the CPU is actually doing.

AMD's counterpart to the Intel SDM. Good to read both when you care about cross-vendor compatibility, particularly around NUMA topology and MSRs.

kernel.org documentation on NUMA memory policies. Useful companion when you're optimising for locality and need to understand how the kernel exposes the topology.

The most useful single-entry documentation point for kernel driver development. Covers device model, DMA, IRQs, bus interfaces, and more.

The best ongoing coverage of Linux kernel development, systems programming, and open source projects. The weekly kernel development summaries alone are worth bookmarking.

The 5G standards starting point. Series 38 covers NR (New Radio); series 23 covers architecture. Dense reading but there's no substitute when you need to know what the standard actually says.