1 files changed, 0 insertions, 451 deletions
diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c
deleted file mode 100644
index 65b70637ad9..00000000000
--- a/arch/x86/kernel/tsc_32.c
+++ /dev/null
@@ -1,451 +0,0 @@
-#include <linux/sched.h>
-#include <linux/clocksource.h>
-#include <linux/workqueue.h>
-#include <linux/cpufreq.h>
-#include <linux/jiffies.h>
-#include <linux/init.h>
-#include <linux/dmi.h>
-#include <linux/percpu.h>
-
-#include <asm/delay.h>
-#include <asm/tsc.h>
-#include <asm/io.h>
-#include <asm/timer.h>
-
-#include "mach_timer.h"
-
-/* native_sched_clock() is called before tsc_init(), so
-   we must start with the TSC soft disabled to prevent
-   erroneous rdtsc usage on !cpu_has_tsc processors */
-static int tsc_disabled = -1;
-
-/*
- * On some systems the TSC frequency does not
- * change with the cpu frequency. So we need
- * an extra value to store the TSC freq
- */
-unsigned int tsc_khz;
-EXPORT_SYMBOL_GPL(tsc_khz);
-
-#ifdef CONFIG_X86_TSC
-static int __init tsc_setup(char *str)
-{
-	printk(KERN_WARNING "notsc: Kernel compiled with CONFIG_X86_TSC, "
-	       "cannot disable TSC completely.\n");
-	tsc_disabled = 1;
-	return 1;
-}
-#else
-/*
- * disable flag for tsc. Takes effect by clearing the TSC cpu flag
- * in cpu/common.c
- */
-static int __init tsc_setup(char *str)
-{
-	setup_clear_cpu_cap(X86_FEATURE_TSC);
-	return 1;
-}
-#endif
-
-__setup("notsc", tsc_setup);
-
-/*
- * code to mark and check if the TSC is unstable
- * due to cpufreq or due to unsynced TSCs
- */
-static int tsc_unstable;
-
-int check_tsc_unstable(void)
-{
-	return tsc_unstable;
-}
-EXPORT_SYMBOL_GPL(check_tsc_unstable);
-
-/* Accelerators for sched_clock()
- * convert from cycles(64bits) => nanoseconds (64bits)
- *  basic equation:
- *		ns = cycles / (freq / ns_per_sec)
- *		ns = cycles * (ns_per_sec / freq)
- *		ns = cycles * (10^9 / (cpu_khz * 10^3))
- *		ns = cycles * (10^6 / cpu_khz)
- *
- *	Then we use scaling math (suggested by george@mvista.com) to get:
- *		ns = cycles * (10^6 * SC / cpu_khz) / SC
- *		ns = cycles * cyc2ns_scale / SC
- *
- *	And since SC is a constant power of two, we can convert the div
- *  into a shift.
- *
- *  We can use khz divisor instead of mhz to keep a better precision, since
- *  cyc2ns_scale is limited to 10^6 * 2^10, which fits in 32 bits.
- *  (mathieu.desnoyers@polymtl.ca)
- *
- *			-johnstul@us.ibm.com "math is hard, lets go shopping!"
- */
-
-DEFINE_PER_CPU(unsigned long, cyc2ns);
-
-static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
-{
-	unsigned long long tsc_now, ns_now;
-	unsigned long flags, *scale;
-
-	local_irq_save(flags);
-	sched_clock_idle_sleep_event();
-
-	scale = &per_cpu(cyc2ns, cpu);
-
-	rdtscll(tsc_now);
-	ns_now = __cycles_2_ns(tsc_now);
-
-	if (cpu_khz)
-		*scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
-
-	/*
-	 * Start smoothly with the new frequency:
-	 */
-	sched_clock_idle_wakeup_event(0);
-	local_irq_restore(flags);
-}
-
-/*
- * Scheduler clock - returns current time in nanosec units.
- */
-unsigned long long native_sched_clock(void)
-{
-	unsigned long long this_offset;
-
-	/*
-	 * Fall back to jiffies if there's no TSC available:
-	 * ( But note that we still use it if the TSC is marked
-	 *   unstable. We do this because unlike Time Of Day,
-	 *   the scheduler clock tolerates small errors and it's
-	 *   very important for it to be as fast as the platform
-	 *   can achive it. )
-	 */
-	if (unlikely(tsc_disabled))
-		/* No locking but a rare wrong value is not a big deal: */
-		return (jiffies_64 - INITIAL_JIFFIES) * (1000000000 / HZ);
-
-	/* read the Time Stamp Counter: */
-	rdtscll(this_offset);
-
-	/* return the value in ns */
-	return cycles_2_ns(this_offset);
-}
-
-/* We need to define a real function for sched_clock, to override the
-   weak default version */
-#ifdef CONFIG_PARAVIRT
-unsigned long long sched_clock(void)
-{
-	return paravirt_sched_clock();
-}
-#else
-unsigned long long sched_clock(void)
-	__attribute__((alias("native_sched_clock")));
-#endif
-
-unsigned long native_calculate_cpu_khz(void)
-{
-	unsigned long long start, end;
-	unsigned long count;
-	u64 delta64 = (u64)ULLONG_MAX;
-	int i;
-	unsigned long flags;
-
-	local_irq_save(flags);
-
-	/* run 3 times to ensure the cache is warm and to get an accurate reading */
-	for (i = 0; i < 3; i++) {
-		mach_prepare_counter();
-		rdtscll(start);
-		mach_countup(&count);
-		rdtscll(end);
-
-		/*
-		 * Error: ECTCNEVERSET
-		 * The CTC wasn't reliable: we got a hit on the very first read,
-		 * or the CPU was so fast/slow that the quotient wouldn't fit in
-		 * 32 bits..
-		 */
-		if (count <= 1)
-			continue;
-
-		/* cpu freq too slow: */
-		if ((end - start) <= CALIBRATE_TIME_MSEC)
-			continue;
-
-		/*
-		 * We want the minimum time of all runs in case one of them
-		 * is inaccurate due to SMI or other delay
-		 */
-		delta64 = min(delta64, (end - start));
-	}
-
-	/* cpu freq too fast (or every run was bad): */
-	if (delta64 > (1ULL<<32))
-		goto err;
-
-	delta64 += CALIBRATE_TIME_MSEC/2; /* round for do_div */
-	do_div(delta64,CALIBRATE_TIME_MSEC);
-
-	local_irq_restore(flags);
-	return (unsigned long)delta64;
-err:
-	local_irq_restore(flags);
-	return 0;
-}
-
-int recalibrate_cpu_khz(void)
-{
-#ifndef CONFIG_SMP
-	unsigned long cpu_khz_old = cpu_khz;
-
-	if (cpu_has_tsc) {
-		cpu_khz = calculate_cpu_khz();
-		tsc_khz = cpu_khz;
-		cpu_data(0).loops_per_jiffy =
-			cpufreq_scale(cpu_data(0).loops_per_jiffy,
-					cpu_khz_old, cpu_khz);
-		return 0;
-	} else
-		return -ENODEV;
-#else
-	return -ENODEV;
-#endif
-}
-
-EXPORT_SYMBOL(recalibrate_cpu_khz);
-
-#ifdef CONFIG_CPU_FREQ
-
-/*
- * if the CPU frequency is scaled, TSC-based delays will need a different
- * loops_per_jiffy value to function properly.
- */
-static unsigned int ref_freq;
-static unsigned long loops_per_jiffy_ref;
-static unsigned long cpu_khz_ref;
-
-static int
-time_cpufreq_notifier(struct notifier_block *nb, unsigned long val, void *data)
-{
-	struct cpufreq_freqs *freq = data;
-
-	if (!ref_freq) {
-		if (!freq->old){
-			ref_freq = freq->new;
-			return 0;
-		}
-		ref_freq = freq->old;
-		loops_per_jiffy_ref = cpu_data(freq->cpu).loops_per_jiffy;
-		cpu_khz_ref = cpu_khz;
-	}
-
-	if ((val == CPUFREQ_PRECHANGE  && freq->old < freq->new) ||
-	    (val == CPUFREQ_POSTCHANGE && freq->old > freq->new) ||
-	    (val == CPUFREQ_RESUMECHANGE)) {
-		if (!(freq->flags & CPUFREQ_CONST_LOOPS))
-			cpu_data(freq->cpu).loops_per_jiffy =
-				cpufreq_scale(loops_per_jiffy_ref,
-						ref_freq, freq->new);
-
-		if (cpu_khz) {
-
-			if (num_online_cpus() == 1)
-				cpu_khz = cpufreq_scale(cpu_khz_ref,
-						ref_freq, freq->new);
-			if (!(freq->flags & CPUFREQ_CONST_LOOPS)) {
-				tsc_khz = cpu_khz;
-				set_cyc2ns_scale(cpu_khz, freq->cpu);
-				/*
-				 * TSC based sched_clock turns
-				 * to junk w/ cpufreq
-				 */
-				mark_tsc_unstable("cpufreq changes");
-			}
-		}
-	}
-
-	return 0;
-}
-
-static struct notifier_block time_cpufreq_notifier_block = {
-	.notifier_call	= time_cpufreq_notifier
-};
-
-static int __init cpufreq_tsc(void)
-{
-	return cpufreq_register_notifier(&time_cpufreq_notifier_block,
-					 CPUFREQ_TRANSITION_NOTIFIER);
-}
-core_initcall(cpufreq_tsc);
-
-#endif
-
-/* clock source code */
-
-static unsigned long current_tsc_khz;
-static struct clocksource clocksource_tsc;
-
-/*
- * We compare the TSC to the cycle_last value in the clocksource
- * structure to avoid a nasty time-warp issue. This can be observed in
- * a very small window right after one CPU updated cycle_last under
- * xtime lock and the other CPU reads a TSC value which is smaller
- * than the cycle_last reference value due to a TSC which is slighty
- * behind. This delta is nowhere else observable, but in that case it
- * results in a forward time jump in the range of hours due to the
- * unsigned delta calculation of the time keeping core code, which is
- * necessary to support wrapping clocksources like pm timer.
- */
-static cycle_t read_tsc(void)
-{
-	cycle_t ret;
-
-	rdtscll(ret);
-
-	return ret >= clocksource_tsc.cycle_last ?
-		ret : clocksource_tsc.cycle_last;
-}
-
-static struct clocksource clocksource_tsc = {
-	.name			= "tsc",
-	.rating			= 300,
-	.read			= read_tsc,
-	.mask			= CLOCKSOURCE_MASK(64),
-	.mult			= 0, /* to be set */
-	.shift			= 22,
-	.flags			= CLOCK_SOURCE_IS_CONTINUOUS |
-				  CLOCK_SOURCE_MUST_VERIFY,
-};
-
-void mark_tsc_unstable(char *reason)
-{
-	if (!tsc_unstable) {
-		tsc_unstable = 1;
-		printk("Marking TSC unstable due to: %s.\n", reason);
-		/* Can be called before registration */
-		if (clocksource_tsc.mult)
-			clocksource_change_rating(&clocksource_tsc, 0);
-		else
-			clocksource_tsc.rating = 0;
-	}
-}
-EXPORT_SYMBOL_GPL(mark_tsc_unstable);
-
-static int __init dmi_mark_tsc_unstable(const struct dmi_system_id *d)
-{
-	printk(KERN_NOTICE "%s detected: marking TSC unstable.\n",
-	       d->ident);
-	tsc_unstable = 1;
-	return 0;
-}
-
-/* List of systems that have known TSC problems */
-static struct dmi_system_id __initdata bad_tsc_dmi_table[] = {
-	{
-	 .callback = dmi_mark_tsc_unstable,
-	 .ident = "IBM Thinkpad 380XD",
-	 .matches = {
-		     DMI_MATCH(DMI_BOARD_VENDOR, "IBM"),
-		     DMI_MATCH(DMI_BOARD_NAME, "2635FA0"),
-		     },
-	 },
-	 {}
-};
-
-/*
- * Make an educated guess if the TSC is trustworthy and synchronized
- * over all CPUs.
- */
-__cpuinit int unsynchronized_tsc(void)
-{
-	if (!cpu_has_tsc || tsc_unstable)
-		return 1;
-
-	/* Anything with constant TSC should be synchronized */
-	if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
-		return 0;
-
-	/*
-	 * Intel systems are normally all synchronized.
-	 * Exceptions must mark TSC as unstable:
-	 */
-	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL) {
-		/* assume multi socket systems are not synchronized: */
-		if (num_possible_cpus() > 1)
-			tsc_unstable = 1;
-	}
-	return tsc_unstable;
-}
-
-/*
- * Geode_LX - the OLPC CPU has a possibly a very reliable TSC
- */
-#ifdef CONFIG_MGEODE_LX
-/* RTSC counts during suspend */
-#define RTSC_SUSP 0x100
-
-static void __init check_geode_tsc_reliable(void)
-{
-	unsigned long res_low, res_high;
-
-	rdmsr_safe(MSR_GEODE_BUSCONT_CONF0, &res_low, &res_high);
-	if (res_low & RTSC_SUSP)
-		clocksource_tsc.flags &= ~CLOCK_SOURCE_MUST_VERIFY;
-}
-#else
-static inline void check_geode_tsc_reliable(void) { }
-#endif
-
-
-void __init tsc_init(void)
-{
-	int cpu;
-
-	if (!cpu_has_tsc || tsc_disabled > 0)
-		return;
-
-	cpu_khz = calculate_cpu_khz();
-	tsc_khz = cpu_khz;
-
-	if (!cpu_khz) {
-		mark_tsc_unstable("could not calculate TSC khz");
-		return;
-	}
-
-	/* now allow native_sched_clock() to use rdtsc */
-	tsc_disabled = 0;
-
-	printk("Detected %lu.%03lu MHz processor.\n",
-				(unsigned long)cpu_khz / 1000,
-				(unsigned long)cpu_khz % 1000);
-
-	/*
-	 * Secondary CPUs do not run through tsc_init(), so set up
-	 * all the scale factors for all CPUs, assuming the same
-	 * speed as the bootup CPU. (cpufreq notifiers will fix this
-	 * up if their speed diverges)
-	 */
-	for_each_possible_cpu(cpu)
-		set_cyc2ns_scale(cpu_khz, cpu);
-
-	use_tsc_delay();
-
-	/* Check and install the TSC clocksource */
-	dmi_check_system(bad_tsc_dmi_table);
-
-	unsynchronized_tsc();
-	check_geode_tsc_reliable();
-	current_tsc_khz = tsc_khz;
-	clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
-							clocksource_tsc.shift);
-	/* lower the rating if we already know its unstable: */
-	if (check_tsc_unstable()) {
-		clocksource_tsc.rating = 0;
-		clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
-	}
-	clocksource_register(&clocksource_tsc);
-}