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Subject[patch-mm 19/33] 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>

---
arch/x86_64/kernel/apic.c | 23 +++++++++++++++--------
1 file changed, 15 insertions(+), 8 deletions(-)
Index: linux-2.6.22-rc6-mm/arch/x86_64/kernel/apic.c
===================================================================
--- linux-2.6.22-rc6-mm.orig/arch/x86_64/kernel/apic.c 2007-07-15 17:33:43.000000000 +0200
+++ linux-2.6.22-rc6-mm/arch/x86_64/kernel/apic.c 2007-07-15 17:48:59.000000000 +0200
@@ -760,14 +760,14 @@ 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);
@@ -780,12 +780,14 @@ static void __setup_APIC_LVTT(unsigned i
& ~(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);

@@ -808,7 +810,10 @@ static void setup_APIC_timer(unsigned in
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. */
@@ -846,8 +851,10 @@ static int __init calibrate_APIC_clock(v
* 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
--

-
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