static void check_and_cede_processor(void)
{
/*
* Ensure our interrupt state is properly tracked,
* also checks if no interrupt has occurred while we
* were soft-disabled
*/
if (prep_irq_for_idle()) {
cede_processor();
#ifdef CONFIG_TRACE_IRQFLAGS
/* Ensure that H_CEDE returns with IRQs on */
if (WARN_ON(!(mfmsr() & MSR_EE)))
__hard_irq_enable();
#endif
}
}
static void cbe_power_save(void)
{
unsigned long ctrl, thread_switch_control;
/* Ensure our interrupt state is properly tracked */
if (!prep_irq_for_idle())
return;
ctrl = mfspr(SPRN_CTRLF);
/* Enable DEC and EE interrupt request */
thread_switch_control = mfspr(SPRN_TSC_CELL);
thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
switch (ctrl & CTRL_CT) {
case CTRL_CT0:
thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
break;
case CTRL_CT1:
thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
break;
default:
printk(KERN_WARNING "%s: unknown configuration\n",
__func__);
break;
}
mtspr(SPRN_TSC_CELL, thread_switch_control);
/*
* go into low thread priority, medium priority will be
* restored for us after wake-up.
*/
HMT_low();
/*
* atomically disable thread execution and runlatch.
* External and Decrementer exceptions are still handled when the
* thread is disabled but now enter in cbe_system_reset_exception()
*/
ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
mtspr(SPRN_CTRLT, ctrl);
/* Re-enable interrupts in MSR */
__hard_irq_enable();
}
static void cbe_power_save(void)
{
unsigned long ctrl, thread_switch_control;
/* Ensure our interrupt state is properly tracked */
if (!prep_irq_for_idle())
return;
ctrl = mfspr(SPRN_CTRLF);
thread_switch_control = mfspr(SPRN_TSC_CELL);
thread_switch_control |= TSC_CELL_EE_ENABLE | TSC_CELL_EE_BOOST;
switch (ctrl & CTRL_CT) {
case CTRL_CT0:
thread_switch_control |= TSC_CELL_DEC_ENABLE_0;
break;
case CTRL_CT1:
thread_switch_control |= TSC_CELL_DEC_ENABLE_1;
break;
default:
printk(KERN_WARNING "%s: unknown configuration\n",
__func__);
break;
}
mtspr(SPRN_TSC_CELL, thread_switch_control);
HMT_low();
ctrl &= ~(CTRL_RUNLATCH | CTRL_TE);
mtspr(SPRN_CTRLT, ctrl);
/* Re-enable interrupts in MSR */
__hard_irq_enable();
}
