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Streaming output scrolled one framebuffer push per line (each a
~3-8 MB write-only copy). The vt now scrolls the logical grid
instantly in RAM and defers the display shift: N pending scrolls are
pushed together as one shift_up_n — one push regardless of batch size.
- vt: PENDING_SCROLLS counter; scroll_up shifts CELLS only; flush
renders nothing while pending (the diff would otherwise re-rasterise
the whole screen per line); sync_scroll() does one gop::shift_up_n +
RENDERED mirror + normal diff flush (which re-blits just the newly
exposed rows and the cursor).
- Sync triggers: batch of 16 rows, ~40 ms of stream pause (100 Hz
TICKS), any CSI sequence (full-screen apps like the editor render
immediately), clear_all/set_cursor_visible, interactive input
(tty read_line/read_byte), and the shell before each prompt.
- gop: shift_up → shift_up_n(n) (one shadow memcpy + one push).
Verified in QEMU: mmap/hexdump streaming renders in coherent batches
with the prompt syncing at the end; clear wipes clean; the editor
scrolls and redraws immediately (45-line file, gutter + status bar
intact, cursor correct); save/exit/cat round-trip unchanged. Release
and dev builds pass.
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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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