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Date: Fri, 9 Nov 2007 16:42:58 -0200 From: Glauber de Oliveira Costa <gcosta@...hat.com> To: linux-kernel@...r.kernel.org Cc: akpm@...ux-foundation.org, glommer@...il.com, tglx@...utronix.de, mingo@...e.hu, rusty@...tcorp.com.au, ak@...e.de, chrisw@...s-sol.org, avi@...ranet.com, anthony@...emonkey.ws, virtualization@...ts.linux-foundation.org, lguest@...abs.org, kvm-devel@...ts.sourceforge.net, zach@...are.com, jun.nakajima@...el.com, Glauber de Oliveira Costa <gcosta@...hat.com>, Steven Rostedt <rostedt@...dmis.org> Subject: [PATCH 17/24] 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@...hat.com> Signed-off-by: Steven Rostedt <rostedt@...dmis.org> Acked-by: Jeremy Fitzhardinge <jeremy@...source.com> --- arch/x86/kernel/time_64.c | 12 +++++++++--- include/asm-x86/time.h | 26 +++++++++++++++++++++----- 2 files changed, 30 insertions(+), 8 deletions(-) diff --git a/arch/x86/kernel/time_64.c b/arch/x86/kernel/time_64.c index f88bf6b..89943d8 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(); } diff --git a/include/asm-x86/time.h b/include/asm-x86/time.h index b3f94cd..68779b0 100644 --- a/include/asm-x86/time.h +++ b/include/asm-x86/time.h @@ -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> -- 1.4.4.2 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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