daniel/danos
1
0
Fork 0
Code Issues 4 Pull Requests Actions Packages Projects 1 Releases Wiki Activity

added physical memory manager

Browse Source
This commit is contained in:
daniel
2026-07-03 11:24:26 +01:00
parent 628c4f6d57
commit cb2f49cb48
5 changed files with 290 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files
docs/README.md
+8 -3
View File
@@ -16,7 +16,10 @@ rather than restate it. Roughly in the order things happen at runtime:
4. **[memory-map.md](memory-map.md) — the memory map.** How the loader learns what
physical RAM exists and hands it to the kernel in danos's own neutral format,
rather than leaking UEFI's memory descriptors across the boundary.
5. **[halting.md](halting.md) — halting.** Why a kernel can't just "exit", and
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
how `while (true) hlt` parks the CPU safely once there's nothing left to do.
Cutting across all of these:
@@ -30,7 +33,8 @@ Cutting across all of these:
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 runs — its
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)).
@@ -39,8 +43,9 @@ or panics, it **halts** ([halting.md](halting.md)).
| Area | Code |
|------|------|
| Bootloader (UEFI app) | `src/efi.zig` → `BOOTX64.efi` |
| Kernel entry, panic, memory-map read-out | `src/main.zig` |
| Kernel entry, panic, bring-up | `src/main.zig` |
| 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/` |
| Build + `run-efi` (QEMU/OVMF) | `build.zig` |