From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glauber de Oliveira Costa Subject: [PATCH 9/16] This patch add provisions for time related functions so they Date: Wed, 31 Oct 2007 16:14:54 -0300 Message-ID: <11938581512730-git-send-email-gcosta@redhat.com> References: <1193858101367-git-send-email-gcosta@redhat.com> <11938581073775-git-send-email-gcosta@redhat.com> <11938581133479-git-send-email-gcosta@redhat.com> <1193858118284-git-send-email-gcosta@redhat.com> <11938581242810-git-send-email-gcosta@redhat.com> <1193858130443-git-send-email-gcosta@redhat.com> <11938581351064-git-send-email-gcosta@redhat.com> <11938581403478-git-send-email-gcosta@redhat.com> <11938581451804-git-send-email-gcosta@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: zach-pghWNbHTmq7QT0dZR+AlfA@public.gmane.org, lguest-mnsaURCQ41sdnm+yROfE0A@public.gmane.org, jeremy-TSDbQ3PG+2Y@public.gmane.org, kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, ak-l3A5Bk7waGM@public.gmane.org, avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org, virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, Glauber de Oliveira Costa To: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Return-path: In-Reply-To: <11938581451804-git-send-email-gcosta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org 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 --- arch/x86/kernel/time_64.c | 42 ++++++++++++++++++++++++++++-------------- include/asm-x86/time.h | 26 ++++++++++++++++++++++---- 2 files changed, 50 insertions(+), 18 deletions(-) diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index c821edc..85ec401 100644 --- a/arch/x86/kernel/time_64.c +++ b/arch/x86/kernel/time_64.c @@ -33,9 +33,12 @@ #include #endif #include +#include #include #include +#include #include +#include #include #include #include @@ -77,18 +80,12 @@ EXPORT_SYMBOL(profile_pc); * sheet for details. */ -static int set_rtc_mmss(unsigned long nowtime) +int do_set_rtc_mmss(unsigned long nowtime) { int retval = 0; int real_seconds, real_minutes, cmos_minutes; unsigned char control, freq_select; -/* - * IRQs are disabled when we're called from the timer interrupt, - * no need for spin_lock_irqsave() - */ - - spin_lock(&rtc_lock); /* * Tell the clock it's being set and stop it. @@ -138,14 +135,22 @@ static int set_rtc_mmss(unsigned long nowtime) CMOS_WRITE(control, RTC_CONTROL); CMOS_WRITE(freq_select, RTC_FREQ_SELECT); - spin_unlock(&rtc_lock); - return retval; } int update_persistent_clock(struct timespec now) { - return set_rtc_mmss(now.tv_sec); + int retval; + +/* + * IRQs are disabled when we're called from the timer interrupt, + * no need for spin_lock_irqsave() + */ + spin_lock(&rtc_lock); + retval = set_wallclock(now.tv_sec); + spin_unlock(&rtc_lock); + + return retval; } static irqreturn_t timer_event_interrupt(int irq, void *dev_id) @@ -157,7 +162,7 @@ static irqreturn_t timer_event_interrupt(int irq, void *dev_id) return IRQ_HANDLED; } -unsigned long read_persistent_clock(void) +unsigned long do_get_cmos_time(void) { unsigned int year, mon, day, hour, min, sec; unsigned long flags; @@ -208,10 +213,15 @@ unsigned long read_persistent_clock(void) return mktime(year, mon, day, hour, min, sec); } +unsigned long read_persistent_clock(void) +{ + return get_wallclock(); +} + /* 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; @@ -261,20 +271,23 @@ 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"); @@ -287,4 +300,5 @@ 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(); } diff --git a/include/asm-x86/time.h b/include/asm-x86/time.h index eac0113..0d18c78 100644 --- a/include/asm-x86/time.h +++ b/include/asm-x86/time.h @@ -1,6 +1,10 @@ -#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); + +#ifndef CONFIG_X86_64 #include #include "mach_time.h" @@ -28,8 +32,22 @@ 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 unsigned long do_get_cmos_time(void); +extern int do_set_rtc_mmss(unsigned long nowtime); +extern void native_time_init_hook(void); + +static inline unsigned long native_get_wallclock(void) +{ + return do_get_cmos_time(); +} + +static inline int native_set_wallclock(unsigned long nowtime) +{ + return do_set_rtc_mmss(nowtime); +} + +#endif #ifdef CONFIG_PARAVIRT #include -- 1.4.4.2 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. 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