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this change is in preparation for amd64. the systab calling
convention was also changed to return uintptr (as segattach
returns a pointer) and the arguments are now passed as
va_list which handles amd64 arguments properly (all arguments
are passed in 64bit quantities on the stack, tho the upper
part will not be initialized when the element is smaller
than 8 bytes).
this is partial. xalloc needs to be converted in the future.
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libmemdraw
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when user does read of exactly 12*12 bytes on draw
ctl file, the snprint() adds one more \0 byte writing
beyond the user buffer and corrupting memory.
fix this by not snprint()ing the final space and add
it manually.
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gpio header.
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according to a comment in linux driver, reading Isrc2
register caused interrupts to be disabled. we used
to read Isrc2 in ifstat() and it was confirmed that
reading ifstat locks up ethernet. removing the Isrc2
read in ifstats, and also reenable interrupts after
reading Isrc2 when the interrupt was not for us.
(this is from the linux driver)
in replenish(), set ring software write pointer (Sring.wp)
*before* the hardware write index register. otherwise
rx() could get status notification for completed
receive but wont find the rx descriptor in the ring.
handle uint wrap arround when calculating ring fill
count and remaining count.
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the stats and ifstats files in the 3rd level of a netif
are not per connection, but for the interface.
this made fstat fail for /net/ether0/N/*stats where N > 0
as the NETID() bits in the qid didnt compare.
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serialize mixing with spinlock to make the addition
on the mixbuffer samples atomic.
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getting rid of the goto at the end of the while
loop by moving the if(subfontnae) case before
the cachechars() call.
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no need to calculate number of runes to fit in
box when box contains no runes.
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cachechars() used to skip over characters on its own when
loadchar() could not find the character or a PJW replacement.
this resulted in wrong width calculation. now we just return
and handle the case inside _string and _stringwidth.
fix subfont leak in stringwidth()
remove annoying prints in stringwidth()
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scrollwheel now works proportional to y mouse position.
special case is when shift is hold down. then scrollwheel
will work like before and scroll one line up or down.
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from erik quanstros 9fans post:
i think the list insertion code needs a single-read
test that f->alarm != 0. to prevent the 0 from
acting like a fencepost. e.g. trying to insert -10 into
list -40 -30 0 -20.
if(alarms.head) {
l = &alarms.head;
for(f = *l; f; f = f->palarm) {
>> fw = f->alarm;
>> if(fw != 0 && (long)(fw - when) >= 0) {
up->palarm = f;
*l = up;
goto done;
}
l = &f->palarm;
}
*l = up;
}
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disabling mouse packet streaming command 0xf5 can fail
when a packet is currently transmitted.
this can be seen when one moves the mouse while running:
while(){echo accelerated >/dev/mousectl; sleep 0.5}
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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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make sure not to dereference Proc* nil pointer. this can potentially
happen from devip which has code like:
if(er->read4p)
postnote(er->read4p, 1, "unbind", 0);
the process it is about to kill can zero er->read4p at any time,
so there is the possibility of the condition to be true and then
er->read4p becoming nil.
check if the process has already exited (p->pid == 0) in postnote()
under p->debug qlock.
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postnote does not raise error, so the error label is not
neccesary.
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when alarmkproc is commited to send the alarm note to the process,
the process might have exited already, or worse, being reused for
another process. pexit() zeros p->alarm at the beginning, but the
kalarmproc() might read p->alarm before pexit() zeroed it, decide
to send the note, then get preempted and pexit() releases the proc.
once kalarmproc() is resumed, the proc might be already something
different and we send the note to the wrong thing.
we now check p->alarm under the debug qlock. that way, pexit()
cannot make progress while we test the condition.
remove the error label arround postnote(). postnote does not raise
error.
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make sure noteid is valid (>0).
prohibit changing note group of kernel processes. this is also
checked for in pgrpnote().
prevent "none" user from changing its note group to another "none"
sessions. this would allow him to send notes other none processes
other than its own.
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one can add:
int idle_spin = 1;
in the kernel configuration to enable the old behaviour. see the
comment at idlehands().
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