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Built GDT + IDT + exception handlers

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daniel
2026-07-03 12:05:41 +01:00
parent 6312e84262
commit 0cc71ec8aa
9 changed files with 458 additions and 23 deletions
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docs/README.md
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@@ -19,7 +19,10 @@ 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. **[halting.md](halting.md) — halting.** Why a kernel can't just "exit", and
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
how `while (true) hlt` parks the CPU safely once there's nothing left to do.
Cutting across all of these:
@@ -34,9 +37,10 @@ The boot flow ties them together: UEFI runs the loader ([efi.md](efi.md)), which
queries the **GOP** to pick a graphics mode ([gop.md](gop.md)), hands the kernel a
**framebuffer** to draw into ([framebuffer.md](framebuffer.md)) and a **memory
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)), runs — its
CPU-specific bits behind the [arch](arch.md) boundary — and when it has finished,
or panics, it **halts** ([halting.md](halting.md)).
into a **frame allocator** ([frame-allocator.md](frame-allocator.md)), installs
its **descriptor tables** so CPU faults are caught ([interrupts.md](interrupts.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)).
## Source map
@@ -47,5 +51,5 @@ 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`, linker script) | `src/arch/x86_64/` |
| Arch-specific kernel code (`halt`, GDT/IDT, exception stubs, linker script) | `src/arch/x86_64/` |
| Build + `run-efi` (QEMU/OVMF) | `build.zig` |