From ee238e5ca66858f80170f87724f84d67183b069a Mon Sep 17 00:00:00 2001 From: Glauber de Oliveira Costa Date: Wed, 30 Jan 2008 13:31:10 +0100 Subject: 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 Signed-off-by: Steven Rostedt Acked-by: Jeremy Fitzhardinge Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- arch/x86/kernel/time_64.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'arch/x86/kernel/time_64.c') diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index bf0bcc9bb001..91d4d495904e 100644 --- a/arch/x86/kernel/time_64.c +++ b/arch/x86/kernel/time_64.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include 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(); } -- cgit