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Make the frequency tuneable via a sysctl.

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Reviewed by:	phk
This commit is contained in:
jhay 1999-09-23 06:02:30 +00:00
parent fd1d2c9a38
commit dd86ea74f1
1 changed files with 24 additions and 1 deletions
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25
sys/i386/i386/mp_clock.c
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@ -27,18 +27,40 @@
static unsigned piix_get_timecount(struct timecounter *tc);
static u_int32_t piix_timecounter_address;
static u_int piix_freq = 14318182/4;
static struct timecounter piix_timecounter = {
piix_get_timecount,
0,
0xffffff,
14318182/4,
0,
"PIIX"
};
SYSCTL_OPAQUE(_debug, OID_AUTO, piix_timecounter, CTLFLAG_RD,
&piix_timecounter, sizeof(piix_timecounter), "S,timecounter", "");
static int
sysctl_machdep_piix_freq SYSCTL_HANDLER_ARGS
{
int error;
u_int freq;
if (piix_timecounter.tc_frequency == 0)
return (EOPNOTSUPP);
freq = piix_freq;
error = sysctl_handle_int(oidp, &freq, sizeof(freq), req);
if (error == 0 && req->newptr != NULL) {
piix_freq = freq;
piix_timecounter.tc_frequency = piix_freq;
update_timecounter(&piix_timecounter);
}
return (error);
}
SYSCTL_PROC(_machdep, OID_AUTO, piix_freq, CTLTYPE_INT | CTLFLAG_RW,
0, sizeof(u_int), sysctl_machdep_piix_freq, "I", "");
static unsigned
piix_get_timecount(struct timecounter *tc)
{
@ -57,6 +79,7 @@ piix_probe (device_t dev)
return 0; /* IO space not mapped */
d = pci_read_config(dev, 0x40, 4);
piix_timecounter_address = (d & 0xffc0) + 8;
piix_timecounter.tc_frequency = piix_freq;
init_timecounter(&piix_timecounter);
return (ENXIO);
};