summaryrefslogtreecommitdiffstats
path: root/arch/x86_64/kernel/apic.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86_64/kernel/apic.c')
-rw-r--r--arch/x86_64/kernel/apic.c35
1 files changed, 29 insertions, 6 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index bd3e45d47c37..d198f7d82e5a 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -68,6 +68,28 @@ int using_apic_timer __read_mostly = 0;
static void apic_pm_activate(void);
+void apic_wait_icr_idle(void)
+{
+ while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
+ cpu_relax();
+}
+
+unsigned int safe_apic_wait_icr_idle(void)
+{
+ unsigned int send_status;
+ int timeout;
+
+ timeout = 0;
+ do {
+ send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
+ if (!send_status)
+ break;
+ udelay(100);
+ } while (timeout++ < 1000);
+
+ return send_status;
+}
+
void enable_NMI_through_LVT0 (void * dummy)
{
unsigned int v;
@@ -817,14 +839,15 @@ static void setup_APIC_timer(unsigned int clocks)
static int __init calibrate_APIC_clock(void)
{
- int apic, apic_start, tsc, tsc_start;
+ unsigned apic, apic_start;
+ unsigned long tsc, tsc_start;
int result;
/*
* Put whatever arbitrary (but long enough) timeout
* value into the APIC clock, we just want to get the
* counter running for calibration.
*/
- __setup_APIC_LVTT(1000000000);
+ __setup_APIC_LVTT(4000000000);
apic_start = apic_read(APIC_TMCCT);
#ifdef CONFIG_X86_PM_TIMER
@@ -835,15 +858,15 @@ static int __init calibrate_APIC_clock(void)
} else
#endif
{
- rdtscl(tsc_start);
+ rdtscll(tsc_start);
do {
apic = apic_read(APIC_TMCCT);
- rdtscl(tsc);
+ rdtscll(tsc);
} while ((tsc - tsc_start) < TICK_COUNT &&
- (apic - apic_start) < TICK_COUNT);
+ (apic_start - apic) < TICK_COUNT);
- result = (apic_start - apic) * 1000L * cpu_khz /
+ result = (apic_start - apic) * 1000L * tsc_khz /
(tsc - tsc_start);
}
printk("result %d\n", result);