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usb: plug and play -- hot-plug, unplug, every interface, real mice

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Devices can now arrive and leave after boot. A "usbhotplug" kernel thread
handles root-port changes, which it is told about by Port Status Change
events and also checks for every quarter second. It also handles changes
behind hubs, which each hub reports on its status-change endpoint. An
unplugged device has its endpoints closed and any transfer in flight
failed. Then its drivers' disconnect hooks run, the slot is disabled and
its memory is freed. Everything behind a hub that goes goes with it. This
needed the interrupt handler to file command and endpoint-0 completions
for their waiters, so that enumeration can run while keyboards interrupt.

On real hardware: the controller is taken from the firmware through USB
Legacy Support before reset, with SMIs off. On Intel 7/8/9 series parts
the ports are switched over from EHCI, which is where firmware leaves
them.

Every interface of a device is offered to the class drivers, not just
the first, so a receiver's mouse on interface 1 gets a driver. Configure
Endpoint now copies the slot context from the controller. Before, it
rebuilt it and lost the route string and TT fields of devices behind
hubs.

HID: pointers are read in report protocol from their report descriptor.
That covers buttons, X/Y and wheel, relative or absolute, and report IDs.
Boot protocol is kept as the fallback for mice and for keyboards.
Non-pointer HID interfaces are declined rather than treated as tablets.
USB keyboards get software key repeat. Mass storage handles up to four
sticks, each unregistered from the block layer when it is pulled out,
along with its cached blocks.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HH7xukt4aaiGj1nQEAoQf1
This commit is contained in:
Nexoniarz 2026-10-22 11:38:13 +02:00
commit fa7669254e
13 changed files with 1367 additions and 240 deletions
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7
include/blkdev.h
View file

@ -36,6 +36,13 @@ struct blkdev_ops {
int blkdev_register(const char *name, const struct blkdev_ops *ops,
void *priv, uint64 nsectors, uint32 secsize);
// The disk has gone -- a USB stick pulled out. Removes it and every partition
// on it, and drops whatever the buffer cache still holds for them, so that a
// different disk given the same number later is not served the old one's
// blocks. A filesystem still mounted from it fails on its next access.
void blkdev_unregister(int dev);
void binval(uint dev); // kernel/dev/bio.c
int blkdev_present(uint dev);
void blkdev_rw(struct buf *b);
int blkdev_flush(uint dev);