xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

devkbd: poll pc keyboard before blocking on kbd.q

Browse source 
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.
This commit is contained in:
cinap_lenrek 2015-08-04 13:43:35 +02:00
parent 1f0057c5fd
commit dcb5f4212b
1 changed files with 15 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
sys/src/9/pc/devkbd.c
View file

@ -277,6 +277,14 @@ i8042auxenable(void (*putc)(int, int))
iunlock(&i8042lock);
}
static void
kbdpoll(void)
{
if(nokbd || qlen(kbd.q) > 0)
return;
i8042intr(0, 0);
}
static Chan *
kbdattach(char *spec)
{
@ -324,20 +332,22 @@ kbdclose(Chan *c)
static Block*
kbdbread(Chan *c, long n, ulong off)
{
if(c->qid.path == Qscancode)
if(c->qid.path == Qscancode){
kbdpoll();
return qbread(kbd.q, n);
else
return devbread(c, n, off);
}
return devbread(c, n, off);
}
static long
kbdread(Chan *c, void *a, long n, vlong)
{
if(c->qid.path == Qscancode)
if(c->qid.path == Qscancode){
kbdpoll();
return qread(kbd.q, a, n);
}
if(c->qid.path == Qdir)
return devdirread(c, a, n, kbdtab, nelem(kbdtab), devgen);
error(Egreg);
return 0;
}