nexoniarz/SchOS
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SchOS/include
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Repository files (latest commit first)
Filename Latest commit message Latest commit date
Nexoniarz 60d06658f0 gfx: draw the console in RAM, and write it to the card write-combined 
On the first real machine with a discrete card (an RTX 3060, 800x600 from
the UEFI GOP) the console was slow enough to photograph mid-scroll, and the
boot died on CPU 1's "cpu1: starting": CPU 0 spun 200M times on the console
lock while CPU 1 held it, scrolling, and called it a deadlock.

The framebuffer is device memory in the uncached 3-4 GB page of the direct
map. QEMU's stdvga is RAM underneath, so nothing showed there; on a card,
gfx_scroll_up's memmove read the whole screen back across the bus one byte
at a time, and every anti-aliased glyph read back each pixel it blended.

So the console now draws into a copy of the screen in RAM (vmap_alloc: kalloc
pages behind a page table of their own, since nothing needs it contiguous),
and gfx_flush() copies the changed rectangle onto the card through an
ioremap_wc() mapping -- PAT entry 4 set to write-combining on every CPU.
Flushes happen where drawing ends: a message, a terminal write, an echo, a
terminal switch. Scrolling moves eight bytes at a time instead of one.

/dev/fb0 reads and writes the card itself, as before. The early console's
fb_info now carries the physical address it always should have.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
2026-10-22 23:46:58 +02:00
..
acpi.h acpi: uACPI, for interrupt routing, the power button and power-off 2026-10-22 16:12:28 +02:00
asm.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
audio.h audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
blkdev.h usb: plug and play -- hot-plug, unplug, every interface, real mice 2026-10-22 11:38:13 +02:00
buf.h Raise the disk ceiling: 64-bit blocks, no FSSIZE panic, LBA48 2026-08-10 18:50:31 +02:00
config_sinit.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
date.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
dbg.h debugger: D5, the network transport -- and the plan closes 2026-09-14 15:33:53 +02:00
defs.h mm: the loader jumped out from under itself, and 3 GB was never the limit 2026-09-25 15:23:55 +02:00
device.h audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
display.h gfx: the second head shows the boot, not just what comes after it 2026-09-22 21:47:35 +02:00
dma.h dma: the 4 MB cap was the refusal, not the arena 2026-09-14 22:52:20 +02:00
elf.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
errno.h schfs: a format version policy, and refusing is not falling back 2026-09-12 17:13:59 +02:00
fb.h Rename Schunix to SchOS; the kernel becomes SchIFT 2026-08-09 14:09:59 +02:00
fcntl.h Rename Schunix to SchOS; the kernel becomes SchIFT 2026-08-09 14:09:59 +02:00
file.h audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
font.h Rename Schunix to SchOS; the kernel becomes SchIFT 2026-08-09 14:09:59 +02:00
fs.h init survives stray signals; commands are 4-34x faster 2026-08-09 15:54:05 +02:00
fsstat.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
gfx.h gfx: draw the console in RAM, and write it to the card write-combined 2026-10-22 23:46:58 +02:00
input.h usb-hid: bind an absolute pointer, and plumb EV_ABS through 2026-08-10 18:27:01 +02:00
ioperm.h ldls: a second driver, and everything it found 2026-09-14 15:20:07 +02:00
irq.h acpi: uACPI, for interrupt routing, the power button and power-off 2026-10-22 16:12:28 +02:00
kbd.h kbd: three layouts, and the arrow keys were sitting on top of UTF-8 2026-09-20 01:09:32 +02:00
keymap.h kbd: three layouts, and the arrow keys were sitting on top of UTF-8 2026-09-20 01:09:32 +02:00
klog.h debugger: D5, the network transport -- and the plan closes 2026-09-14 15:33:53 +02:00
kmem.h kmem: a slab allocator, and what the fixed tables actually cost 2026-09-22 09:32:06 +02:00
logo.h docs: a branding folder, and the three marks are not interchangeable 2026-09-12 18:19:09 +02:00
memlayout.h mm: the loader jumped out from under itself, and 3 GB was never the limit 2026-09-25 15:23:55 +02:00
mmu.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
mp.h boot: stop assuming the machine is an emulator 2026-10-22 10:29:12 +02:00
netdev.h net: a frame wakes the stack, instead of waiting for the clock 2026-09-12 17:23:46 +02:00
netuser.h ldls: L4 was free after all, and the plan closes 2026-09-14 13:37:04 +02:00
param.h audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00
pci.h acpi: uACPI, for interrupt routing, the power button and power-off 2026-10-22 16:12:28 +02:00
pciuser.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
posix.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
proc.h proc: real CPU time, a tty number, and an exe that is a symlink 2026-09-22 02:45:00 +02:00
qr.h docs: four directories, and a rule for when a thing leaves the roadmap 2026-09-12 17:13:35 +02:00
sbuf.h debugger: D5, the network transport -- and the plan closes 2026-09-14 15:33:53 +02:00
schboot.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
schfs.h unix: a bound socket is a file 2026-09-22 10:06:10 +02:00
schinit.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
sleeplock.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
socket.h unix: a bound socket is a file 2026-09-22 10:06:10 +02:00
spinlock.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
stat.h unix: a bound socket is a file 2026-09-22 10:06:10 +02:00
syscall.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
text.h gfx: one glyph blitter, and a terminal cell is a surface 2026-09-23 17:57:16 +02:00
theme.h gfx: the console and the crash screen stop drawing on a driver by name 2026-08-15 17:04:10 +02:00
traps.h irq: MSI first, and poll the INTx lines that never arrive 2026-10-22 10:29:24 +02:00
ttf.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
types.h Initial commit: Schunix as it stands before the SchOS rename 2026-08-09 13:47:01 +02:00
uaccess.h Rename Schunix to SchOS; the kernel becomes SchIFT 2026-08-09 14:09:59 +02:00
usb.h usb: plug and play -- hot-plug, unplug, every interface, real mice 2026-10-22 11:38:13 +02:00
user.h memfd: a shared memory object you reach by descriptor 2026-09-22 09:47:31 +02:00
virtio.h hybrid: a modeset, from a process 2026-09-14 01:36:05 +02:00
vmap.h gfx: draw the console in RAM, and write it to the card write-combined 2026-10-22 23:46:58 +02:00
vt.h licence: SchOS is GPL-2.0-or-later, no longer Apache-2.0 2026-10-22 08:48:45 +02:00
x86.h audio: /dev/dsp, AudioEngine, and an AC'97 under it 2026-09-24 14:23:13 +02:00