static void
acpi_cpu_cx_probe(struct acpi_cpu_softc *sc)
{
ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);
/* Use initial sleep value of 1 sec. to start with lowest idle state. */
sc->cpu_prev_sleep = 1000000;
sc->cpu_cx_lowest = 0;
/*
* Check for the ACPI 2.0 _CST sleep states object. If we can't find
* any, we'll revert to generic FADT/P_BLK Cx control method which will
* be handled by acpi_cpu_startup. We need to defer to after having
* probed all the cpus in the system before probing for generic Cx
* states as we may already have found cpus with valid _CST packages
*/
if (!cpu_cx_generic && acpi_cpu_cx_cst(sc) != 0) {
/*
* We were unable to find a _CST package for this cpu or there
* was an error parsing it. Switch back to generic mode.
*/
cpu_cx_generic = TRUE;
if (bootverbose)
device_printf(sc->cpu_dev, "switching to generic Cx mode\n");
}
/*
* TODO: _CSD Package should be checked here.
*/
}
/*
* Re-evaluate the _CST object when we are notified that it changed.
*
* XXX Re-evaluation disabled until locking is done.
*/
static void
acpi_cpu_cst_notify(device_t dev)
{
struct acpi_cpu_softc *sc = device_get_softc(dev);
struct acpi_cpu_softc *isc;
int i;
/* Update the list of Cx states. */
acpi_cpu_cx_cst(sc);
acpi_cpu_cx_list(sc);
/* Update the new lowest useable Cx state for all CPUs. */
crit_enter();
cpu_cx_count = 0;
for (i = 0; i < cpu_ndevices; i++) {
isc = device_get_softc(cpu_devices[i]);
if (isc->cpu_cx_count > cpu_cx_count)
cpu_cx_count = isc->cpu_cx_count;
}
crit_exit();
}
/*
* Re-evaluate the _CST object when we are notified that it changed.
*
* XXX Re-evaluation disabled until locking is done.
*/
static void
acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context)
{
struct acpi_cpu_softc *sc = (struct acpi_cpu_softc *)context;
struct acpi_cpu_softc *isc;
int i;
if (notify != ACPI_NOTIFY_CX_STATES)
return;
/* Update the list of Cx states. */
acpi_cpu_cx_cst(sc);
acpi_cpu_cx_list(sc);
/* Update the new lowest useable Cx state for all CPUs. */
ACPI_SERIAL_BEGIN(cpu);
cpu_cx_count = 0;
for (i = 0; i < cpu_ndevices; i++) {
isc = device_get_softc(cpu_devices[i]);
if (isc->cpu_cx_count > cpu_cx_count)
cpu_cx_count = isc->cpu_cx_count;
}
ACPI_SERIAL_END(cpu);
}
