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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>
This commit is contained in:
Glauber de Oliveira Costa 2008-01-30 13:31:10 +01:00 committed by Ingo Molnar
parent 49a697871e
commit ee238e5ca6
2 changed files with 30 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/kernel/time_64.c
View File

@ -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();
}

26
include/asm-x86/time.h
View File

@ -1,8 +1,12 @@
#ifndef _ASMi386_TIME_H
#define _ASMi386_TIME_H
#ifndef _ASMX86_TIME_H
#define _ASMX86_TIME_H
extern void (*late_time_init)(void);
extern void hpet_time_init(void);
#include <linux/efi.h>
#include <asm/mc146818rtc.h>
#ifdef CONFIG_X86_32
#include <linux/efi.h>
static inline unsigned long native_get_wallclock(void)
{
@ -28,8 +32,20 @@ static inline int native_set_wallclock(unsigned long nowtime)
return retval;
}
extern void (*late_time_init)(void);
extern void hpet_time_init(void);
#else
extern void native_time_init_hook(void);
static inline unsigned long native_get_wallclock(void)
{
return mach_get_cmos_time();
}
static inline int native_set_wallclock(unsigned long nowtime)
{
return mach_set_rtc_mmss(nowtime);
}
#endif
#ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h>