#include <linux/clockchips.h>
#include <linux/acpi_pmtmr.h>
#include <linux/module.h>
+#include <linux/dmi.h>
#include <asm/atomic.h>
#include <asm/smp.h>
/* Local APIC timer verification ok */
static int local_apic_timer_verify_ok;
+/* Disable local APIC timer from the kernel commandline or via dmi quirk */
+static int local_apic_timer_disabled;
+/* Local APIC timer works in C2 */
+int local_apic_timer_c2_ok;
+EXPORT_SYMBOL_GPL(local_apic_timer_c2_ok);
/*
* Debug level, exported for io_apic.c
long delta, deltapm;
int pm_referenced = 0;
+ if (boot_cpu_has(X86_FEATURE_LAPIC_TIMER_BROKEN))
+ local_apic_timer_disabled = 1;
+
+ /*
+ * The local apic timer can be disabled via the kernel
+ * commandline or from the test above. Register the lapic
+ * timer as a dummy clock event source on SMP systems, so the
+ * broadcast mechanism is used. On UP systems simply ignore it.
+ */
+ if (local_apic_timer_disabled) {
+ /* No broadcast on UP ! */
+ if (num_possible_cpus() > 1)
+ setup_APIC_timer();
+ return;
+ }
+
apic_printk(APIC_VERBOSE, "Using local APIC timer interrupts.\n"
"calibrating APIC timer ...\n");
apic_printk(APIC_VERBOSE, "... jiffies result ok\n");
else
local_apic_timer_verify_ok = 0;
- }
+ } else
+ local_irq_enable();
if (!local_apic_timer_verify_ok) {
printk(KERN_WARNING
}
early_param("nolapic", parse_nolapic);
+static int __init parse_disable_lapic_timer(char *arg)
+{
+ local_apic_timer_disabled = 1;
+ return 0;
+}
+early_param("nolapic_timer", parse_disable_lapic_timer);
+
+static int __init parse_lapic_timer_c2_ok(char *arg)
+{
+ local_apic_timer_c2_ok = 1;
+ return 0;
+}
+early_param("lapic_timer_c2_ok", parse_lapic_timer_c2_ok);
+
static int __init apic_set_verbosity(char *str)
{
if (strcmp("debug", str) == 0)