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Diffstat (limited to 'arch/x86/kernel/tsc_32.c')
-rw-r--r--arch/x86/kernel/tsc_32.c74
1 files changed, 1 insertions, 73 deletions
diff --git a/arch/x86/kernel/tsc_32.c b/arch/x86/kernel/tsc_32.c
index dc8990056d7..40c0aafb358 100644
--- a/arch/x86/kernel/tsc_32.c
+++ b/arch/x86/kernel/tsc_32.c
@@ -42,7 +42,7 @@ extern int tsc_disabled;
DEFINE_PER_CPU(unsigned long, cyc2ns);
-static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
+void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
{
unsigned long long tsc_now, ns_now;
unsigned long flags, *scale;
@@ -65,78 +65,6 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
local_irq_restore(flags);
}
-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
/*