041b706b2f
sysctl_handle_int is not sizeof the int type you want to export. The type must always be an int or an unsigned int. Remove the instances where a sizeof(variable) is passed to stop people accidently cut and pasting these examples. In a few places this was sysctl_handle_int was being used on 64 bit types, which would truncate the value to be exported. In these cases use sysctl_handle_quad to export them and change the format to Q so that sysctl(1) can still print them.
151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/*-
|
|
* ----------------------------------------------------------------------------
|
|
* "THE BEER-WARE LICENSE" (Revision 42):
|
|
* <phk@FreeBSD.ORG> wrote this file. As long as you retain this notice you
|
|
* can do whatever you want with this stuff. If we meet some day, and you think
|
|
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
|
|
* ----------------------------------------------------------------------------
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*-
|
|
* Just when we thought life were beautiful, reality pops its grim face over
|
|
* the edge again:
|
|
*
|
|
* ] 20. ACPI Timer Errata
|
|
* ]
|
|
* ] Problem: The power management timer may return improper result when
|
|
* ] read. Although the timer value settles properly after incrementing,
|
|
* ] while incrementing there is a 3nS window every 69.8nS where the
|
|
* ] timer value is indeterminate (a 4.2% chance that the data will be
|
|
* ] incorrect when read). As a result, the ACPI free running count up
|
|
* ] timer specification is violated due to erroneous reads. Implication:
|
|
* ] System hangs due to the "inaccuracy" of the timer when used by
|
|
* ] software for time critical events and delays.
|
|
* ]
|
|
* ] Workaround: Read the register twice and compare.
|
|
* ] Status: This will not be fixed in the PIIX4 or PIIX4E.
|
|
*
|
|
* The counter is in other words not latched to the PCI bus clock when
|
|
* read. Notice the workaround isn't: We need to read until we have
|
|
* three monotonic samples and then use the middle one, otherwise we are
|
|
* not protected against the fact that the bits can be wrong in two
|
|
* directions. If we only cared about monosity two reads would be enough.
|
|
*/
|
|
|
|
/* #include "opt_bus.h" */
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/timetc.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/bus.h>
|
|
|
|
#include <dev/pci/pcireg.h>
|
|
#include <dev/pci/pcivar.h>
|
|
|
|
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, /* get_timecount */
|
|
0, /* no poll_pps */
|
|
0xffffff, /* counter_mask */
|
|
0, /* frequency */
|
|
"PIIX" /* name */
|
|
};
|
|
|
|
|
|
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, 0, req);
|
|
if (error == 0 && req->newptr != NULL) {
|
|
piix_freq = freq;
|
|
piix_timecounter.tc_frequency = piix_freq;
|
|
}
|
|
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)
|
|
{
|
|
unsigned u1, u2, u3;
|
|
|
|
u2 = inl(piix_timecounter_address);
|
|
u3 = inl(piix_timecounter_address);
|
|
do {
|
|
u1 = u2;
|
|
u2 = u3;
|
|
u3 = inl(piix_timecounter_address);
|
|
} while (u1 > u2 || u2 > u3);
|
|
return (u2);
|
|
}
|
|
|
|
static int
|
|
piix_probe(device_t dev)
|
|
{
|
|
u_int32_t d;
|
|
|
|
if (devclass_get_device(devclass_find("acpi"), 0) != NULL)
|
|
return (ENXIO);
|
|
switch (pci_get_devid(dev)) {
|
|
case 0x71138086:
|
|
device_set_desc(dev, "PIIX Timecounter");
|
|
break;
|
|
default:
|
|
return (ENXIO);
|
|
}
|
|
|
|
d = pci_read_config(dev, PCIR_COMMAND, 2);
|
|
if (!(d & PCIM_CMD_PORTEN)) {
|
|
device_printf(dev, "PIIX I/O space not mapped\n");
|
|
return (ENXIO);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
piix_attach(device_t dev)
|
|
{
|
|
u_int32_t d;
|
|
|
|
d = pci_read_config(dev, 0x40, 4);
|
|
piix_timecounter_address = (d & 0xffc0) + 8;
|
|
piix_timecounter.tc_frequency = piix_freq;
|
|
tc_init(&piix_timecounter);
|
|
return (0);
|
|
}
|
|
|
|
static device_method_t piix_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, piix_probe),
|
|
DEVMETHOD(device_attach, piix_attach),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t piix_driver = {
|
|
"piix",
|
|
piix_methods,
|
|
1,
|
|
};
|
|
|
|
static devclass_t piix_devclass;
|
|
|
|
DRIVER_MODULE(piix, pci, piix_driver, piix_devclass, 0, 0);
|