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Built paging / the kernel's own page tables (with a TSS+IST)

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daniel
2026-07-03 12:23:55 +01:00
parent 0cc71ec8aa
commit 9cf135302d
10 changed files with 283 additions and 13 deletions
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docs/README.md
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@@ -19,10 +19,13 @@ rather than restate it. Roughly in the order things happen at runtime:
5. **[frame-allocator.md](frame-allocator.md) — the physical frame allocator.** The
bitmap allocator that hands out and reclaims 4 KiB physical frames from that
map — the primitive page tables and the heap will be built on.
6. **[interrupts.md](interrupts.md) — interrupts and exceptions.** The GDT and IDT,
the exception stubs, and the handler that reports a CPU fault in red instead of
letting it triple-fault into a silent reset.
7. **[halting.md](halting.md) — halting.** Why a kernel can't just "exit", and
6. **[interrupts.md](interrupts.md) — interrupts and exceptions.** The GDT, IDT and
TSS, the exception stubs, and the handler that reports a CPU fault in red instead
of letting it triple-fault into a silent reset.
7. **[paging.md](paging.md) — the kernel's page tables.** Building our own 4-level
page tables, identity-mapping the low 4 GiB, and switching CR3 off the firmware's
tables onto ours.
8. **[halting.md](halting.md) — halting.** Why a kernel can't just "exit", and
how `while (true) hlt` parks the CPU safely once there's nothing left to do.
Cutting across all of these:
@@ -39,6 +42,7 @@ queries the **GOP** to pick a graphics mode ([gop.md](gop.md)), hands the kernel
map** of physical RAM ([memory-map.md](memory-map.md)); the kernel turns that map
into a **frame allocator** ([frame-allocator.md](frame-allocator.md)), installs
its **descriptor tables** so CPU faults are caught ([interrupts.md](interrupts.md)),
builds its own **page tables** and switches onto them ([paging.md](paging.md)),
runs — its CPU-specific bits behind the [arch](arch.md) boundary — and when it has
finished, or panics, it **halts** ([halting.md](halting.md)).
@@ -51,5 +55,5 @@ finished, or panics, it **halts** ([halting.md](halting.md)).
| Shared loader↔kernel contract (`BootInfo`, `Framebuffer`, `MemoryMap`, ABI) | `src/root.zig` |
| Physical frame allocator | `src/pmm.zig` |
| Framebuffer text console | `src/console.zig` |
| Arch-specific kernel code (`halt`, GDT/IDT, exception stubs, linker script) | `src/arch/x86_64/` |
| Arch-specific kernel code (`halt`, GDT/IDT/TSS, exception stubs, page tables, linker script) | `src/arch/x86_64/` |
| Build + `run-efi` (QEMU/OVMF) | `build.zig` |