| Commit message (Collapse) | Author | Age | Files | Lines |
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Real-hardware scroll freeze (no exception, QEMU-clean) — the per-word
push (0.5.3) did not fix it, so the wedge is upstream of the push.
A QEMU slow-display simulation (new DISPLAY_STALL knob + shell 'stall'
command busy-waits per display store, mimicking an uncached real-GPU
framebuffer) proved the per-word push and shadow memmove are slow but
finite — the shell keeps ticking, scrolls eventually complete. The
freeze mechanism QEMU cannot exhibit is the shadow *landing on the
framebuffer*: the heap free list spans the fb hole, so the 1.9 MB heap
shadow can alias the display on machines where firmware reports the fb
as ConventionalMemory — every scroll then becomes an MMIO->MMIO memcpy
on an uncached framebuffer, which wedges real hardware (a stall, no
fault, hence no dump).
Fix:
- gop::init_shadow(): allocate the shadow from the fb-aware page
allocator (init_page_allocator marks fb pages used per-page), so it
can never overlap the display; heap allocation kept only as a
fallback with an explicit overlap rejection. Boot log now prints
'gop: shadow @ <addr> ... origin=page-alloc|heap|none'.
- Scroll shadow memmove converted to per-word stores (belt and
suspenders — immune to any future fb-aliased shadow).
- Verified on QEMU: shadow @ 0x100000 vs fb 0x80000000..0x801d5000,
overlap=false; all 5 test suites pass; scroll completes even under
the stalled-display simulation.
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The real-hardware crash (2 lines of white + freeze, no CPU exception
even with the 0.5.2 fault dumps) pointed away from a fault and at a
stall: the scroll's full-frame push used one 1.92 MB rep-movsb to the
framebuffer. On QEMU the framebuffer is RAM, so it flies; on a real
GPU the framebuffer is uncached MMIO and the CPU's fast-string burst
path can stall forever — the shell wedges mid-instruction, the cursor
task's own writes wedge too, no exception fires (MMIO writes don't
fault), and the screen shows the torn partial push (the white bands).
The boot-time clear() always worked on the same hardware and uses
per-word volatile stores, so the scroll push now uses the identical
pattern: shadow reads (cached RAM, cheap) + individually-posted
display stores. Interruptible between stores, never a bulk burst,
and functionally identical on QEMU (all 5 suites re-pass).
Also converts the no-shadow fallback shift to the same per-word
pattern. CONTEXT.md updated (scroll-cost note + versioning).
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The real-hardware scroll crash (white bands + instant freeze, QEMU-clean)
was invisible because the only trace was a single serial line on machines
with no serial console. This makes every crash self-identifying and
hardens the real-hardware failure surfaces:
- Every CPU exception vector 0-31 now has an IDT entry (macro-generated
stubs; 8/14 keep their IST stacks). A fault in the shell prints a
white-on-red band to the framebuffer via gop::dump_lines (raw fb
writes bypassing the vt, fully clamped) plus a parseable serial line:
'!!! <kind> vec=N err=… rip=… cr2=… rsp=… rflags=… task=N "name"',
then halts — instead of converging to a cryptic double fault.
Background-task faults abort the task as before.
- Boot log now reports the authoritative post-SetMode geometry:
'gop: fb base=… size=… pitch=… WxH bpp=… bgr=…', so the next real
machine's report identifies whether pitch*height exceeds the mapping.
- Framebuffer writes (clear, push_rect, shift_up_n bulk push, cursor
overlay) are clamped to the firmware's framebuffer_size: a pitch-
padded mode degrades to a truncated view instead of faulting past
the mapping.
- The GOP framebuffer region is excluded from the page allocator (and
subtracted from the heap's conventional-region pick) even when the
firmware lists it as ConventionalMemory — kernel allocations can
never overwrite the display again. The GOP protocol is located and
peeked before the memory map is captured so the exclusion is known
at heap-init time.
- Shell gains a hidden 'fault' command (deliberate unmapped write) and
'make test-fault' verifies the dump: vec=14, cr2=0x400000000000,
task=0, halt — no triple fault. All other suites re-pass.
- CONTEXT.md: fault-dump format documented for real-hardware reports.
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The kernel used to inherit whatever GOP mode the firmware picked
(QEMU/OVMF gave 1280x800). Now every surface derives from a fixed
800x600 canvas:
- uefi: typed EfiGopQueryMode/SetMode/GetMode fn pointers in
GraphicsOutputProtocol (were raw *mut c_void, never called).
- gop::select_gop_mode: scan the mode list for an exact 800x600
(32-bit BGR/RGB only, the driver assumes 4 Bpp), SetMode it; fall
back to the smallest mode that fits the canvas, then to the
firmware's choice. SetMode may move both the mode info pointer and
the framebuffer base, so both are re-read after the switch. Boot
log: 'gop: mode 3 selected — 800x600 (was 1280x800)'.
- tests: relative assertions are resolution-agnostic; test-gfx and
test-mouse had a boot-log race (shell line prints before the cursor
task line) — now wait for the cursor line instead of grepping once.
All four suites pass at 800x600. 0 build warnings.
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The first visible GUI surface: real rect primitives, a single
shadow→display push path, and an on-screen mouse cursor that can
never race the text surface.
gop:
- fill_rect + push_rect(x,y,w,h): every raster op rasterises into the
RAM shadow, then push_rect copies the rect to the display (write-only,
still never read) and composites the cursor on top. blit_glyph and
scroll shifts now route through it.
- cursor overlay: 12x16 pointer (const-fn built from column lists) drawn
white with a black offset outline; position in one AtomicU64 (x:high
32, y:low 32) — unpack masks the low word (a bare 'as usize' cast is
a no-op on 64-bit). The cursor never enters the shadow, so erasing is
just a shadow push of the old rect.
- cursor_redraw after scroll shifts and once at spawn (the vt diff never
re-blits idle cells).
cursor task (task 2, spawned at boot when a mouse is present):
- owns the PS/2 ring; polls every 10 ms, moves the cursor (clamped),
tracks buttons, and forwards every event to a task's queue when
'mouse <id>' armed it (the window-manager input path).
- /dev/mouse is now a position device (x/y/buttons snapshot); 'mouse'
watches the cursor live (prints on change); 'cursor' prints one-shot
state; 'gfx' draws a status-bar demo; 'gfx check' is an in-kernel
pixel self-test (shadow readback, display readback, cursor overlay
purity) — PASS/FAIL per stage.
Tests (headless QEMU + monitor injection):
- make test-gfx (new): all four compositor checks PASS.
- make test-mouse (rewritten): cursor tracks mouse_move deltas, buttons
ride along, /dev/mouse snapshot, live watch, real-event queue routing.
- make test-msg: task numbering shifted (cursor is task 2; msgrecv is
task 3) — updated, still PASS.
- make test-disk regression re-passes. 0 build warnings.
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Mouse (IRQ12, stream mode): ByteRing generalized for both PS/2 devices,
ISR routes data-port bytes by the controller's aux bit; mouse_init with
bounded-ACK handshake (boots without a mouse); packet decoder with
bit-3 resync, screen-relative deltas, buttons. Exposed as /dev/mouse,
the `mouse` stream command, and `make test-mouse`.
Message queues (ADR 0003's GUI-era primitive): every task gets a static
16-slot TaskMsg ring; send/recv/recv_blocking with direct wake + tick
scan safety net for the lost-wakeup race; `msgrecv`/`send` commands,
`mouse <id>` routes real IRQ12 events into a task's queue, jobs shows
q=. `make test-msg` + `make test-disk` regression pass.
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176-byte frames
- sched: 16-slot static table, shell=task 0, idle=task 1, spawn with
guard page + 8 KiB stack, RR on the 100 Hz tick, int 0x60 yield,
sleep_ms, lazy reap, jobs/bg/sleep/kill shell commands
- gdt: own GDT mirroring UEFI selectors + TSS with IST1/IST2
(guard-page overflows die gracefully instead of triple-faulting)
- interrupts: isr_dispatch returns next frame in rax; IntFrame grows
rsp/ss fields — QEMU's 64-bit iretq always pops all five slots from
a 176-byte frame, so synthetic task frames must carry rsp=top+ss
(a 160-byte frame made the first iretq pop rsp/ss from the unmapped
page beyond the frame)
- panic handler: task panics abort the task, shell keeps running
- main: sched::init moved after page allocator + adopted tables
(the idle's stack+guard need both; it was silently not spawning)
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Kernel now has the classic UNIX console split, so full-screen ANSI apps
can run in ring 0:
- vt.rs: terminal emulator owning the text screen — cell grid (char +
fg/bg), logical cursor (inverse-video), scrolling, and a small ANSI
CSI parser (cursor position H/f, erase J/K, moves A-D, SGR 16-colour
with correct ANSI→VGA mapping, cursor show/hide ?25). Blits only
changed cells; scroll shifts cell grids + pixels and re-rasterises
only the exposed bottom row. gop_println!/clear_screen now render
through the vt; gop.rs is the raw rasteriser (colored glyph blits,
pixel shift).
- tty.rs: line discipline — canonical read_line (echo, line buffer,
^C cancel, ^D EOF) moved out of the shell, and raw read_byte that
translates KeyEvents to the terminal byte protocol (arrows → ESC[A-D,
Backspace → 0x7f, ^X → 0x18, Ctrl+arrows → ESC[1;5A-D, Home/End/PgUp/
PgDn/Delete). interrupt_pressed() stays for streaming commands.
- ps2: generic Ctrl(char) + CtrlArrow events (was: only CtrlC/CtrlD).
- rsdosedit: no_std port of the RNG rsedit editor as the first real
app — undo, syntax highlighting (verified green/gray/yellow on the
framebuffer), search, word nav, smart indent, ^S save / ^X exit /
^X again to discard. termios → tty raw, stdout → vt, std::fs → VFS
(ramfs), SIGWINCH → fixed geometry, force-exit window → key counter.
- shell: 'edit <path>' command; read_line/strbuf moved to rsnix.
- CONTEXT.md: layout + milestones + known-issue perf notes.
Verified in QEMU: full edit → type → arrow-move → insert → save → exit
round trip with byte-exact file content; ANSI colors via screendump.
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Architecture:
rs-dos/ (workspace root, was raisernics/)
├── rsnix/ — kernel lib crate (uefi, serial, gop, ps2, interrupts, memory)
├── shell/ — shell lib crate (prompt, commands, line input)
├── rsdos/ — binary crate (efi_main, init, panic handler)
└── rsboot/ — future git submodule
No functional changes — boots to shell prompt identically.
Version auto-pulled from Cargo.toml via env!("CARGO_PKG_VERSION").
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Interrupts are functional: PIT timer (~100 Hz), PS/2 keyboard IRQ
with lock-free SPSC ring buffer, PIC remapped, IDT with 64-bit
interrupt gates. Kernel runs cleanly with no exceptions.
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- Bare-metal x86_64 UEFI kernel (PE32+, no libc)
- GOP framebuffer + 8x16 bitmap font
- PS/2 keyboard (polling, scancode set 1)
- UART 16550 serial driver (COM1, 115200 8N1)
- Bump allocator as #[global_allocator] (alloc::String, Vec, format!)
- UEFI memory map capture (static buffer, ADR 0001)
- Shell with 7 commands (help, echo, clear, hello, info, mem, halt)
- Dual output: GOP framebuffer + serial console
- Makefile: run, run-gui, debug, release, image targets
- tools/: qemu.sh, boot-image.sh, debug-kernel.py
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