usbxhci: make stuck usb transactions interruptable.
some control transactions can confuse the xhci controller so
much that it even fails to respond to command abort or STOPEP
control command. with no way for us to abort the transaction
but a full controller reset.
we give the controller 5 seconds to abort our initial
transaction and if that fails we wake the recover process
to reset the controller.
from what i can tell, sending port enable is a spec violation.
this fixes a hang during hub enumeration in the ASMedia
xhci controller when i plug in my IBM UltraNav SK-8845.
also, send unsuspend when port is suspended instead of enable.
from the USB 2 specification:
11.24.2.7.1.2 PORT_ENABLE
...
This bit may be set only as a result of a SetPortFeature(PORT_ENABLE).
...
The hub response to a SetPortFeature(PORT_ENABLE) request is not specified.
7c: fix long to vlong/pointer conversion, avoid negative immediate offsets
we have to explicitely convert to vlong by sign or
zero extending as not every operation leaves a proper
zero/sign extended result in the register. for example
NEGW will zero extend, breaking negative int offsets
on pointers.
we explicitely insert SXTW or MOVWU instructions which
the peephole optimizer takes out again when it is safe
todo so.
when promoting constant offsets to immediate offsets,
make sure the offset will be in range. otherwise the
linker will produce not so optimal pointer arithmetic
instructions to calculate the offset.
the possible bitmasks generated depend on the data width
of the instruction, so we introduce C_BITCON32 and C_BITCON64
operand types to keep them apart.
add arm64 c compiler and assembler (thanks charles forsyth)
this is the the initial sync of charles forsyths plan9 c
compiler suite from http://bitbucket.org/plan9-from-bell-labs/9-cc
at changeset version 54:65fb8bb56c59
pc64: get rid of TSTKTOP, USTKTOP is the end of user address space
the temporary stack segment used to be at a fixed address above or
below the user stack. these days, the temp stack is mapped dynamically
by sysexec so TSTKTOP is obsolete.
sshnet: pass on open failure error message, simplify
return the error message from MSG_CHANNEL_OPEN_FAILURE
in the "connect" control write.
use a extra state "Finished" to distinguish server from client
initiated teardown. that way we do not need to track if we
send the MSG_CHANNEL_CLOSE message in closeclient(). this way
we also cannot be fooled by misbehaving server.
simplify hangupclient() by removing state transitions and doing
them in the caller explicitely. that way we can use hangupclient()
instead of dialedclient().
cinap_lenrek [Sat, 30 Mar 2019 08:17:46 +0000 (09:17 +0100)]
dtracy: avoid dmachlock() race
between being commited to a machno and having acquired the lock, the
scheduler could come in an schedule us on a different processor. the
solution is to have dtmachlock() take a special -1 argument to mean
"current mach" and return the actual mach number after the lock has
been acquired and interrupts being disabled.
cinap_lenrek [Sat, 30 Mar 2019 04:50:14 +0000 (05:50 +0100)]
dist/mkfile: aux/stub -d /n/src9/usr to avoid overbinding /usr in case /n/src9 an / alias
when /n/src9 is an alias for / (bind / /n/src9), then the bind
from /sys/lib/dist/usr on /n/src9/usr would also overbind
/usr and potentially make the build target file inaccessible.
the solution is to run aux/stub -d /n/src9/usr.
this works as aux/stub mounts itself on /n/src9, so the bind
for /n/src9/usr will not override /usr in the root filesystem
but the stub directory from aux/stub.
cinap_lenrek [Sun, 17 Mar 2019 04:44:55 +0000 (05:44 +0100)]
ip/ipconfig: use defaults for loopback
- do not write /net/ndb for loopback medium unless -p is specified
- use defmask() instead of hardcoded /64 for v6 to get correct /128 mask for ::1
- only do duplicate address detection on ethernet
- increase buffer size to support up to 4096 bit RSA keys
- handle PMTUDiscovery option and respond to pmtu probes
- handle port in Address option
- wlock(&netlk) before closing udpfd to sync with writers
- move default subnet handling out of gethost()
cinap_lenrek [Thu, 7 Mar 2019 21:39:50 +0000 (22:39 +0100)]
devip: ignore the evil bit in fragment info field
using ~IP_DF mask to select offset and "more fragments" bits
includes the evil bit 15. so instead define a constant IP_FO
for the fragment offset bits and use (IP_MF|IP_FO). that way
the evil bit gets ignored and doesnt cause any useless calls
to ipreassemble().