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| author | salmonik <salmonik@tuta.io> | 2026-07-31 19:53:53 +0200 |
|---|---|---|
| committer | salmonik <salmonik@tuta.io> | 2026-07-31 19:53:53 +0200 |
| commit | dc23d2f22cafeb6b97ba460789a834a6c586314d (patch) | |
| tree | 987bec11922073923c4c42bda84c0f670884dbca /bins | |
| parent | vt: defer scrolls and batch framebuffer pushes (diff) | |
| download | rs-dos-dc23d2f22cafeb6b97ba460789a834a6c586314d.tar.gz rs-dos-dc23d2f22cafeb6b97ba460789a834a6c586314d.zip | |
ahci: SATA driver + FAT32 persistent disk mounted at /disk
- ahci.rs: polling AHCI on PCI class 1/6/1, bus mastering + ABAR map,
port 0 up, IDENTIFY + READ/WRITE DMA EXT through one 4KiB DMA buffer
- fat.rs: BPB parse, whole-FAT RAM cache with write-back to both copies,
LFN read/write, dirs, multi-cluster files, FSInfo free-count sync,
space-padded dot entries ('..' = cluster 0 under root), fsck-clean
- fs.rs: /disk mount node + 24-slot ephemeral node pool; ls/cat/hexdump/
echo/mkdir/touch/rm/edit all work on disk paths unchanged
- QEMU: explicit bus assignment (disk=ide.0, ESP=ide.1); the implicit
fat:rw:esp drive was stealing AHCI port 0
- Debugged against QEMU source: header DW0 is CFL in bits 4:0 / PRDTL in
bits 31:16 (Linux libahci layout), FIS count at bytes 12-13, device at
byte 7; QEMU rejects H2D FIS flags bits 6:4, so direction is the
header W bit only
- Verified: full shell round-trip on /disk, reboot persistence (poweroff
then mdir/mtype and a fresh boot), fsck.fat clean
Diffstat (limited to 'bins')
0 files changed, 0 insertions, 0 deletions