Commit ee238e5c authored by Glauber de Oliveira Costa's avatar Glauber de Oliveira Costa Committed by Ingo Molnar

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: default avatarGlauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
Acked-by: default avatarJeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 49a69787
...@@ -21,6 +21,8 @@ ...@@ -21,6 +21,8 @@
#include <asm/hpet.h> #include <asm/hpet.h>
#include <asm/nmi.h> #include <asm/nmi.h>
#include <asm/vgtod.h> #include <asm/vgtod.h>
#include <asm/time.h>
#include <asm/timer.h>
volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES; volatile unsigned long __jiffies __section_jiffies = INITIAL_JIFFIES;
...@@ -54,7 +56,7 @@ static irqreturn_t timer_event_interrupt(int irq, void *dev_id) ...@@ -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 /* calibrate_cpu is used on systems with fixed rate TSCs to determine
* processor frequency */ * processor frequency */
#define TICK_COUNT 100000000 #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 tsc_start, tsc_now;
int i, no_ctr_free; int i, no_ctr_free;
...@@ -104,20 +106,23 @@ static struct irqaction irq0 = { ...@@ -104,20 +106,23 @@ static struct irqaction irq0 = {
.name = "timer" .name = "timer"
}; };
void __init time_init(void) void __init hpet_time_init(void)
{ {
if (!hpet_enable()) if (!hpet_enable())
setup_pit_timer(); setup_pit_timer();
setup_irq(0, &irq0); setup_irq(0, &irq0);
}
void __init time_init(void)
{
tsc_calibrate(); tsc_calibrate();
cpu_khz = tsc_khz; cpu_khz = tsc_khz;
if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) && if (cpu_has(&boot_cpu_data, X86_FEATURE_CONSTANT_TSC) &&
boot_cpu_data.x86_vendor == X86_VENDOR_AMD && boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
boot_cpu_data.x86 == 16) boot_cpu_data.x86 == 16)
cpu_khz = tsc_calibrate_cpu_khz(); cpu_khz = calculate_cpu_khz();
if (unsynchronized_tsc()) if (unsynchronized_tsc())
mark_tsc_unstable("TSCs unsynchronized"); mark_tsc_unstable("TSCs unsynchronized");
...@@ -130,4 +135,5 @@ void __init time_init(void) ...@@ -130,4 +135,5 @@ void __init time_init(void)
printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n", printk(KERN_INFO "time.c: Detected %d.%03d MHz processor.\n",
cpu_khz / 1000, cpu_khz % 1000); cpu_khz / 1000, cpu_khz % 1000);
init_tsc_clocksource(); init_tsc_clocksource();
late_time_init = choose_time_init();
} }
#ifndef _ASMi386_TIME_H #ifndef _ASMX86_TIME_H
#define _ASMi386_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> #include <asm/mc146818rtc.h>
#ifdef CONFIG_X86_32
#include <linux/efi.h>
static inline unsigned long native_get_wallclock(void) static inline unsigned long native_get_wallclock(void)
{ {
...@@ -28,8 +32,20 @@ static inline int native_set_wallclock(unsigned long nowtime) ...@@ -28,8 +32,20 @@ static inline int native_set_wallclock(unsigned long nowtime)
return retval; return retval;
} }
extern void (*late_time_init)(void); #else
extern void hpet_time_init(void); 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 #ifdef CONFIG_PARAVIRT
#include <asm/paravirt.h> #include <asm/paravirt.h>
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment