From dc23d2f22cafeb6b97ba460789a834a6c586314d Mon Sep 17 00:00:00 2001 From: salmonik Date: Fri, 31 Jul 2026 19:53:53 +0200 Subject: 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 --- rsnix/src/vt.rs | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) (limited to 'rsnix/src/vt.rs') diff --git a/rsnix/src/vt.rs b/rsnix/src/vt.rs index 88129f2..59378f3 100644 --- a/rsnix/src/vt.rs +++ b/rsnix/src/vt.rs @@ -432,9 +432,7 @@ fn scroll_up() { // appears promptly. const TICK_LIMIT: u16 = 4; let now = crate::interrupts::TICKS.load(core::sync::atomic::Ordering::Relaxed); - if PENDING_SCROLLS >= SCROLL_BATCH - || now.wrapping_sub(LAST_SYNC_TICK) > TICK_LIMIT - { + if PENDING_SCROLLS >= SCROLL_BATCH || now.wrapping_sub(LAST_SYNC_TICK) > TICK_LIMIT { sync_scroll(); } } -- cgit v1.2.3