Loading page…
Master the fundamental concepts of protected mode transition through this focused micro-challenge.
Paging translates linear addresses through page directories and tables. Set CR0.PG only after CR3 points to a valid page directory and identity-mapped regions cover the current instruction pointer. For example, map the first 4 MB identically so code at 0x100000 keeps executing after paging turns on.
nasmLoading…
If CR0.PG triggers fault 14 immediately, your identity map probably does not cover the instruction pointer or stack. Map at least the first 4 MB before enabling paging, then expand maps for kernel heap later. Zero the page directory first so empty entries are not present. Use 4 KB pages in two levels for the classic 32-bit setup exercise.
You will construct a minimal page directory and enable CR0.PG with an identity map. This exercise requires CR3 setup before PG bit and verified mappings for stack and code regions.
Implement basic paging setup in C.
Requirements:
Test:
Three hints are available for this task, revealed one at a time inside the code workspace so you can struggle productively before seeing them.
All starter code and reference implementations are available for your local setup.
View on Github