the kernel uses fixed area (TSTKTOP, TSTKSIZ) of the address
space to temporarily map the new stack segment for exec. for
386 and arm, this area was right below the stack segment which
has the problem that the program can map arbitrary segments
there (even readonly).
alpha and ppc dont have this problem as they map the temporary
exec stack *above* the user reachable stack segement and segattach
prevents one from mapping anything above or overlaping the stack.
lots of arch code assumes USTKTOP being the end of userspace
address space and changing this to TSTKTOP would work, but results
in lots of hard to test changes.
instead, we'r going to map the temporary stack programmatically
finding a hole in the address space where to map it. we also lift
the size limitation for arguments and allow arguments to fill
the whole new stack segement.
the TSTKTOP and TSTKSIZ are not used anymore so they where removed.
references:
http://9fans.net/archive/2013/03/203http://9fans.net/archive/2013/03/202http://9fans.net/archive/2013/03/197http://9fans.net/archive/2013/03/195http://9fans.net/archive/2013/03/181
the channel= plan9.ini parameter isnt needed anymore as we now
hop the channels to scan for beacons. the status is also indicated
with the link led :-)
handle all these flags on packet transmission like RTS for big
packets and sending data packets to the AP instead of broadcasting
everything.
properly setup bss hardware node table and filtering. now promisc
mode is only used when requested.
handle deauth message from ap.
increase node table to 32 entries.
on almost all machines, we get tons of these prints for pci busses that
are not physically there but are described in the ACPI namespace. the
reason that we enumerate these is because we do not enumerate _INI and _STA
methods to check if they are present. we just match the information with
the PCI devices we enumerated with our generic pci code. this works fine and
doesnt require aml code to poke arround in pci config space.
some controls are inverted. we reflect this by specifying
negative range in the volume table now and let genaudiovolread()
and genaudiovolwrite() do the conversion.
set adc (recording) sample rate the same as playback for now.
make these separate entries later when we reintroduce in/out
attributes to volume controls.
access to non standard serial port COM3 at i/o port 0x200 causes
kernel panic on some machines (Toshiba Sattelite 1415-S115). also,
some machines have gameport at 0x200.
i readded uartisa to the pcf and pccpuf kernel configurations so
one can use plan9.ini to add non standard uarts like:
uart2=type=isa port=0x200 irq=5
previously, we had to maintain 3 sets of pci vid/did's:
1) in /lib/vgadb for detection
2) in the userspace driver in aux/vga
3) in the kernel mode driver
this change makes the kernel mode driver more dumb in
the cases where possible. we let userspace do the pci
enumeration and if needed, it can set the pci address
of the vga card. kernel mode drivers can assume to get
the right pci device passed in scr->pci for enable()
and linear() functions and just do very basic sanity
checking before mapping framebuffer and mmio regions.
vgalinearpciid() was removed as userspace is responsible
to pick pci device.
theres a new vgactl message "pcidev" where userspace
can set the bus address. we initialize scr->pci in
vgareset() to the first pci graphics card found. this
should cover cases when an old aux/vga binary is used
that doesnt use the new pcidev message.
userspace drivers will now use the pci device that got
a match from /lib/vgadb and skip ther own enumeration.
this way, vga cards can be made to work by simply adding
an entry in vgadb with no need to modify userspace or
kernelspace drivers. this is not always possible if
the driver derives information from the specific card
model.
matushita dvd-ram on thinkpad x301 hangs on the inquiry command
done from scsiverify(). not sure whats wrong with it, but at least
this makes the machine boot.
wait for the drives to become ready or missing in iaonline()
and iaverify() to prevent nobootprompt= race.
handle task file error status (this can happen for atapi)
under some circumstances and would hang the io if not
handled.
preventively poll interrupts from the checkdrive kproc in
case we loose interrupts (bad via machine).
implement bios handoff procedure.
make sure the port is idle before programming the port dma
regios in configdrive(), do not start command processing
on the port unless phylink has been established.
widgets that do not have Wampovrcap have ther default
amplifier parameters stored in the aydio function group.
only if the amp override bit is *not* set, then the widget
stores its own amplifier parameters and we have to query
its node id, otherwise the audio function group node id.
setting Asud in the cmd register is not needed, because
Apwr is (Asud|Apod) already. the problem really was that
the drive comes up with sstatus Spresent (001), so we never
spun it up because (p->sstatus & Sphylink) == 0 was never
met (Sphylink being a mask (011) overlaping Spresent bit).
the spinup wait loop has to run only for the staggered spinup
case (h->cap & Hss) and it should wait for the drive to be
detected by the phy, not just cold presence detect.
thinkpad r400 dvd drive was not recognized. port status
indicated present device but no Sphylink because the
device did not spin up. setting the Asud bit in ahciconfigdrive()
made it come up clean.
add scsciverify() call in iaverify() for atapi inquiry.
keep in some of the debug prints and add a *ahcidebug= boot
parameter to enable them.
bios takeover was broken. bad Ceecpmask (was 8, should be 0xFF)
causing it to miss the legacy control ecap and properly take
overship of the controller. also the order seems wrong, we
have to takeover before we do anything with the controller.
remove the pci config space 0xc0 = 0x2000 write. this the
uhci legacy register. its not anywhere in the ehci spec.
regarding the ohci spec, a overrun td might supply a full
packet of data. this change seemed to have caused nusb/kb to
fail with getting spurious zero byte reads. reverting for now.
implement SMM emulation driver handover in ohcireset(). this fixes
hang and defunct internal keyboard problems on a acer notebook.
dont spin forever waiting for the controller on soft reset in init().
check both, donehead pointer *and* interrupt status for
processed td event (Wdh) similar to the ohci spec example for
processed tds and unlink immidiately. acknowledge *all* the
interrupt status bits before masking. mask out unhandled
events.
various stuff:
check for christmas light interrupt status (cardbus controller
removed?)
add (missing?) break for Tddataovr error case in qhinterrupt().
(changed on sources, not clear why?)
mask interrupt events on shutdown() (from sources).
the syscallno check in syscallfmt() was wrong. the unsigned
syscall number was cast to an signed integer. so negative
values would pass the check provoking bad memory access from
kernel. the check also has an off by one. one has to check
syscallno >= nsyscalls instead of syscallno > nsyscalls.
access to the p->syscalltrace string was not protected
from modification in devproc. you could awake the process
and cause it to free the string giving an opportunity for
the kernel to access bad memory. or someone could kill the
process (pexit would just free it).
now the string is protected by the usual p->debug qlock. we
also keep the string arround until it is overwritten again
or the process exists. this has the nice side effect that
one can inspect it after the process crashed.
another problem was that our validaddr() would error() instead
of pexiting the current process. the code was changed to only
access up->s.args after it was validated and copied instead of
accessing the user stack directly. this also prevents a sneaky
multithreaded process from chaning the arguments under us.
in case our validaddr() errors, we cannot assume valid user
stack after the waserror() if block. use up->s.arg[0] for the
noted() call to avoid bad access.
in devproc status read handler the p->status, p->text and p->user
could overflow the local statbuf buffer as they where copied into
it with code like: memmove(statbuf+someoff, p->text, strlen(p->text)).
now using readstr() which will truncate if the string is too long.
make strncpy() usage consistent, make sure results are always null
terminated.
use fastclock timer (pit2) to measure cpufreq in guesscpuhz(). this
gives a bigger period minimizing the danger of overrun as pit2 runs
at the constant maximum period of 0x10000 ticks. also use smaller
loop increments (1000) and bigger maximum loop upper bound.
move the loops < ... check to the bottom of the loop so we get the
effective count *before* adding the next loop increment.
ilock() while doing measurements in guesscpuhz() to prevent accidents
with other processors reading fastclock or doing guesscpuhz()
in parralel.
export new i8253reset() function for apm to reset the timers after
a apm bios suspend.
