linux-kernel - [PATCH 8/11] Add a CPU KHZ calibration function to paravirt-ops

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Date:	Mon, 5 Feb 2007 19:53:23 -0800
From:	Zachary Amsden <zach@...are.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@....de>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Zachary Amsden <zach@...are.com>
Subject: [PATCH 8/11] Add a CPU KHZ calibration function to paravirt-ops

Provide a paravirtualized way to get the CPU clock frequency; this allows much
of the code in tsc.c to be shared between all paravirt implementations.

Subject: Add a CPU KHZ calibration function to paravirt-ops
Signed-off-by: Zachary Amsden <zach@...are.com>

diff -r a08f195aa92a arch/i386/kernel/vmi.c
--- a/arch/i386/kernel/vmi.c	Fri Feb 02 16:30:59 2007 -0800
+++ b/arch/i386/kernel/vmi.c	Fri Feb 02 16:31:45 2007 -0800
@@ -881,6 +881,7 @@ static int __init activate_vmi(void)
 		paravirt_ops.setup_secondary_clock = vmi_timer_setup_secondary_alarm;
 #endif
 		paravirt_ops.get_scheduled_cycles = vmi_get_sched_cycles;
+ 		paravirt_ops.get_cpu_khz = vmi_cpu_khz;
 	}
 
 	/*
diff -r a08f195aa92a arch/i386/kernel/vmitime.c
--- a/arch/i386/kernel/vmitime.c	Fri Feb 02 16:30:59 2007 -0800
+++ b/arch/i386/kernel/vmitime.c	Fri Feb 02 16:30:59 2007 -0800
@@ -175,6 +175,15 @@ unsigned long long vmi_get_sched_cycles(
 	return read_available_cycles();
 }
 
+unsigned long vmi_cpu_khz(void)
+{
+	unsigned long long khz;
+
+	khz = vmi_timer_ops.get_cycle_frequency();
+	(void)do_div(khz, 1000);
+	return khz;
+}
+
 void __init vmi_time_init(void)
 {
 	unsigned long long cycles_per_sec, cycles_per_msec;
@@ -204,7 +213,6 @@ void __init vmi_time_init(void)
 	(void)do_div(cycles_per_alarm, alarm_hz);
 	cycles_per_msec = cycles_per_sec;
 	(void)do_div(cycles_per_msec, 1000);
-	cpu_khz = cycles_per_msec;
 
 	printk(KERN_WARNING "VMI timer cycles/sec = %llu ; cycles/jiffy = %llu ;"
 	       "cycles/alarm = %llu\n", cycles_per_sec, cycles_per_jiffy,
diff -r a08f195aa92a include/asm-i386/vmi_time.h
--- a/include/asm-i386/vmi_time.h	Fri Feb 02 16:30:59 2007 -0800
+++ b/include/asm-i386/vmi_time.h	Fri Feb 02 16:31:24 2007 -0800
@@ -50,6 +50,7 @@ extern unsigned long vmi_get_wallclock(v
 extern unsigned long vmi_get_wallclock(void);
 extern int vmi_set_wallclock(unsigned long now);
 extern unsigned long long vmi_get_sched_cycles(void);
+extern unsigned long vmi_cpu_khz(void);
 
 #ifdef CONFIG_X86_LOCAL_APIC
 extern void __init vmi_timer_setup_boot_alarm(void);
-
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