1 files changed, 25 insertions, 0 deletions

diff --git a/arch/i386/kernel/cpu/cpufreq/speedstep-est-common.h b/arch/i386/kernel/cpu/cpufreq/speedstep-est-common.h
new file mode 100644
index 000000000000..5ce995c9d866
--- /dev/null
+++ b/arch/i386/kernel/cpu/cpufreq/speedstep-est-common.h
@@ -0,0 +1,25 @@
+/*
+ * Routines common for drivers handling Enhanced Speedstep Technology
+ *  Copyright (C) 2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
+ *
+ *  Licensed under the terms of the GNU GPL License version 2 -- see
+ *  COPYING for details.
+ */
+
+static inline int is_const_loops_cpu(unsigned int cpu)
+{
+        struct cpuinfo_x86      *c = cpu_data + cpu;
+
+        if (c->x86_vendor != X86_VENDOR_INTEL || !cpu_has(c, X86_FEATURE_EST))
+                return 0;
+
+        /*
+         * on P-4s, the TSC runs with constant frequency independent of cpu freq
+         * when we use EST
+         */
+        if (c->x86 == 0xf)
+                return 1;
+
+        return 0;
+}
+