/*
* Spurious interrupts should _never_ happen with our APIC/SMP architecture.
*/
fastcall void smp_spurious_interrupt(struct cpu_user_regs *regs)
{
unsigned long v;
struct cpu_user_regs *old_regs = set_irq_regs(regs);
this_cpu(irq_count)++;
irq_enter();
/*
* Check if this is a vectored interrupt (most likely, as this is probably
* a request to dump local CPU state). Vectored interrupts are ACKed;
* spurious interrupts are not.
*/
v = apic_read(APIC_ISR + ((SPURIOUS_APIC_VECTOR & ~0x1f) >> 1));
if (v & (1 << (SPURIOUS_APIC_VECTOR & 0x1f))) {
ack_APIC_irq();
if (this_cpu(state_dump_pending)) {
this_cpu(state_dump_pending) = 0;
dump_execstate(regs);
goto out;
}
}
/* see sw-dev-man vol 3, chapter 7.4.13.5 */
printk(KERN_INFO "spurious APIC interrupt on CPU#%d, should "
"never happen.\n", smp_processor_id());
out:
irq_exit();
set_irq_regs(old_regs);
}
/*
* Spurious interrupts should _never_ happen with our APIC/SMP architecture.
*/
void spurious_interrupt(struct cpu_user_regs *regs)
{
/*
* Check if this is a vectored interrupt (most likely, as this is probably
* a request to dump local CPU state). Vectored interrupts are ACKed;
* spurious interrupts are not.
*/
if (apic_isr_read(SPURIOUS_APIC_VECTOR)) {
ack_APIC_irq();
if (this_cpu(state_dump_pending)) {
this_cpu(state_dump_pending) = 0;
dump_execstate(regs);
goto out;
}
}
/* see sw-dev-man vol 3, chapter 7.4.13.5 */
printk(KERN_INFO "spurious APIC interrupt on CPU#%d, should "
"never happen.\n", smp_processor_id());
out: ;
}