OSDev Wiki - Memory Management
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Community wiki overview for hobbyist kernel developers, explaining physical and virtual address spaces, segmentation, paging, and allocator design, with links to implementation pages. Readers gain the vocabulary and design choices needed to write their own kernel's memory manager.
More resources on Memory Management
xv6 OS Source
MIT's small Unix-like teaching kernel for RISC-V, published with source code and a companion commentary book. Reading and modifying it shows concretely how page tables, kernel and user address spaces, physical page allocation, and traps are implemented.
osdev.org
OSDev.org is a community-driven resource and wiki for operating system development. It offers tutorials, articles, and sample code on topics like kernels, bootloaders, memory management, drivers, and other low-level OS concepts, plus forums for discussion.