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the psaux driver is not used in any kernel configuration and theres
no userspace mouse daemon. i8042auxcmds() is wrong as access
to the user buffer can fault and we are holding an ilocks.
little cleanups in devkbd.
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remove kbdenable()/kbdinit()
on vmware, loading a new kernel sometimes reboots when
wiggling the mouse. disabling keyboard and mouse on
shutdown fixes the issue.
make sure ps2 mouse is disabled on init, will get re-enabled
in i8042auxenable().
keyboard isnt special anymore, we can just use the devreset
entry point in the device to do the keyboard initialization,
so kbdinit()/kbdenable() are not needed anymore.
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the keyboard stops sending interrupts when its fifo gets full,
which can happen on boot when keys get mashed while interrupts
are still disabled. to work arround this, call the keyboard
interrupt handler when kbd.q is starved before blocking.
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there was a memory corruption bug caused by us enabling the
ps2mouseputc() handler *before* initializing packetsize.
once we enabled the handler, mouse interrupts could come
in and advance the packet buffer index (nb) beyond the
buffer boundaries.
as ps2mouseputc() only checked for ++nb == packetsize, once
nb was advanced beyond the packetsize, it would continue writing
beyond the buffer and corrupt memory with each mouse packet byte.
solution is to initialize packetsize *before* enabling the
handler, and also do a >= check in ps2mouseputc() in case the
packetsize gets changed to a smaller value at runtime.
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sometimes, ps2 mouse setup failed on thinkpads during boot. disabling
packet streaming while we program the mouse seems to fix the issue.
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only decrement refcount when file was successfully opend
on clunk, fix refcount when devopen() errors.
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