arch/i386/kernel/cpu/cpufreq/speedstep-est-common.h

   1 /*
   2  * Routines common for drivers handling Enhanced Speedstep Technology
   3  *  Copyright (C) 2004 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
   4  *
   5  *  Licensed under the terms of the GNU GPL License version 2 -- see
   6  *  COPYING for details.
   7  */
   8
   9 static inline int is_const_loops_cpu(unsigned int cpu)
  10 {
  11         struct cpuinfo_x86      *c = cpu_data + cpu;
  12
  13         if (c->x86_vendor != X86_VENDOR_INTEL || !cpu_has(c, X86_FEATURE_EST))
  14                 return 0;
  15
  16         /*
  17          * on P-4s, the TSC runs with constant frequency independent of cpu freq
  18          * when we use EST
  19          */
  20         if (c->x86 == 0xf)
  21                 return 1;
  22
  23         return 0;
  24 }
  25