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authorGlauber de Oliveira Costa <gcosta@redhat.com>2008-01-30 13:31:10 +0100
committerIngo Molnar <mingo@elte.hu>2008-01-30 13:31:10 +0100
commitee238e5ca66858f80170f87724f84d67183b069a (patch)
treec08fe7edeac9b55fad0be5f7050cc3ddf8796232 /arch/x86/kernel/time_64.c
parent49a697871e2edcbc9cc682466bc4f2316b854d23 (diff)
x86: prepare time related functions for paravirt
This patch add provisions for time related functions so they can be later replaced by paravirt versions. it basically encloses {g,s}et_wallclock inside the already existent functions update_persistent_clock and read_persistent_clock, and defines {s,g}et_wallclock to the core of such functions. it also allow for a later-on-game time initialization, as done by i386. Paravirt guests can set a function to do their own initialization this way. Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/time_64.c')
-rw-r--r--arch/x86/kernel/time_64.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c
index bf0bcc9bb00..91d4d495904 100644
--- a/arch/x86/kernel/time_64.c
+++ b/arch/x86/kernel/time_64.c
@@ -21,6 +21,8 @@
#include <asm/hpet.h>
#include <asm/nmi.h>
#include <asm/vgtod.h>
+#include <asm/time.h>
+#include <asm/timer.h>
volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
@@ -54,7 +56,7 @@ static irqreturn_t timer_event_interrupt(int irq, void *dev_id)
/* calibrate_cpu is used on systems with fixed rate TSCs to determine
* processor frequency */
#define TICK_COUNT 100000000
-static unsigned int __init tsc_calibrate_cpu_khz(void)
+unsigned long __init native_calculate_cpu_khz(void)
{
int tsc_start, tsc_now;
int i, no_ctr_free;
@@ -104,20 +106,23 @@ static struct irqaction irq0 = {
.name = "timer"
};
-void __init time_init(void)
+void __init hpet_time_init(void)
{
if (!hpet_enable())
setup_pit_timer();
setup_irq(0, &irq0);
+}
+void __init time_init(void)
+{
tsc_calibrate();
cpu_khz = tsc_khz;
if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) &&
boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 == 16)
- cpu_khz = tsc_calibrate_cpu_khz();
+ cpu_khz = calculate_cpu_khz();
if (unsynchronized_tsc())
mark_tsc_unstable("TSCs unsynchronized");
@@ -130,4 +135,5 @@ void __init time_init(void)
printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000);
init_tsc_clocksource();
+ late_time_init = choose_time_init();
}