nexoniarz/SchOS
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SchOS/include
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Filename Latest commit message Latest commit date
Nexoniarz 7e8d5e2821 irq: MSI first, and poll the INTx lines that never arrive 
PCI drivers took their interrupt from INTERRUPT_LINE. On real hardware
that is the 8259's number, not the IOAPIC pin the device is wired to
(that is in ACPI _PRT, which needs AML), so nothing ever arrived. xHCI
is entirely interrupt-driven, so the USB keyboard and a USB root would
have hung even on a clean boot. Under QEMU the two numbers agree,
which is why it never showed.

- pci_irq_attach()/pci_irq_detach(): MSI, then MSI-X if the driver
  allows it, then INTx. The handler is registered before MSI is
  enabled, so no edge is lost. xHCI, e1000, r8169 and rtl8139 use it.
- Lines 24-29 are MSI vectors. The LAPIC error vector moves from 19,
  which is a PCI pin on Intel chipsets, to 30. Nothing is placed at or
  above vector 64 (T_SYSCALL).
- A storming line is masked and its handlers are polled instead of
  being left to eat the CPU. A level line that has had a handler for 2 s
  and never fired is polled every tick by a kernel thread.

Tested in QEMU q35 with the root on a USB stick: xHCI and e1000e on
MSI; then MSI disabled and INTx deliberately misrouted, where xHCI got
zero interrupts and the root still mounted through the poller. i440fx
INTx and the rtl8139 hand-over are unchanged.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HH7xukt4aaiGj1nQEAoQf1
2026-10-22 10:29:24 +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
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: the second head shows the boot, not just what comes after it 2026-09-22 21:47:35 +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 irq: MSI first, and poll the INTx lines that never arrive 2026-10-22 10:29:24 +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 irq: MSI first, and poll the INTx lines that never arrive 2026-10-22 10:29:24 +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-hid: bind an absolute pointer, and plumb EV_ABS through 2026-08-10 18:27:01 +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
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