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x86_64: prepare apic code for clock events 

Change __setup_APIC_LVTT so it takes the arguments which are necessary
for the later clock events switch.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
This commit is contained in:
Thomas Gleixner 2007-10-12 23:04:06 +02:00 committed by Thomas Gleixner
parent 7ffeeb1e03
commit 801740971a
1 changed files with 15 additions and 8 deletions
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23
arch/x86/kernel/apic_64.c
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@ -759,14 +759,14 @@ void __init init_apic_mappings(void)
#define APIC_DIVISOR 16
static void __setup_APIC_LVTT(unsigned int clocks)
static void __setup_APIC_LVTT(unsigned int clocks, int oneshot, int irqen)
{
unsigned int lvtt_value, tmp_value;
int cpu = smp_processor_id();
lvtt_value = APIC_LVT_TIMER_PERIODIC | LOCAL_TIMER_VECTOR;
if (cpu_isset(cpu, timer_interrupt_broadcast_ipi_mask))
lvtt_value = LOCAL_TIMER_VECTOR;
if (!oneshot)
lvtt_value |= APIC_LVT_TIMER_PERIODIC;
if (!irqen)
lvtt_value |= APIC_LVT_MASKED;
apic_write(APIC_LVTT, lvtt_value);
@ -779,12 +779,14 @@ static void __setup_APIC_LVTT(unsigned int clocks)
& ~(APIC_TDR_DIV_1 | APIC_TDR_DIV_TMBASE))
| APIC_TDR_DIV_16);
apic_write(APIC_TMICT, clocks/APIC_DIVISOR);
if (!oneshot)
apic_write(APIC_TMICT, clocks/APIC_DIVISOR);
}
static void setup_APIC_timer(unsigned int clocks)
{
unsigned long flags;
int irqen;
local_irq_save(flags);
@ -805,7 +807,10 @@ static void setup_APIC_timer(unsigned int clocks)
c2 |= inb_p(0x40) << 8;
} while (c2 - c1 < 300);
}
__setup_APIC_LVTT(clocks);
irqen = ! cpu_isset(smp_processor_id(),
timer_interrupt_broadcast_ipi_mask);
__setup_APIC_LVTT(clocks, 0, irqen);
/* Turn off PIT interrupt if we use APIC timer as main timer.
Only works with the PM timer right now
TBD fix it for HPET too. */
@ -843,8 +848,10 @@ static int __init calibrate_APIC_clock(void)
* Put whatever arbitrary (but long enough) timeout
* value into the APIC clock, we just want to get the
* counter running for calibration.
*
* No interrupt enable !
*/
__setup_APIC_LVTT(4000000000);
__setup_APIC_LVTT(4000000000, 0, 0);
apic_start = apic_read(APIC_TMCCT);
#ifdef CONFIG_X86_PM_TIMER