arch/x86/kernel/cpu/hypervisor.c

   1 /*
   2  * Common hypervisor code
   3  *
   4  * Copyright (C) 2008, VMware, Inc.
   5  * Author : Alok N Kataria <akataria@vmware.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  15  * NON INFRINGEMENT.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  21  *
  22  */
  23
  24 #include <asm/processor.h>
  25 #include <asm/vmware.h>
  26 #include <asm/hypervisor.h>
  27
  28 static inline void __cpuinit
  29 detect_hypervisor_vendor(struct cpuinfo_x86 *c)
  30 {
  31         if (vmware_platform())
  32                 c->x86_hyper_vendor = X86_HYPER_VENDOR_VMWARE;
  33         else
  34                 c->x86_hyper_vendor = X86_HYPER_VENDOR_NONE;
  35 }
  36
  37 unsigned long get_hypervisor_tsc_freq(void)
  38 {
  39         if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_VMWARE)
  40                 return vmware_get_tsc_khz();
  41         return 0;
  42 }
  43
  44 static inline void __cpuinit
  45 hypervisor_set_feature_bits(struct cpuinfo_x86 *c)
  46 {
  47         if (boot_cpu_data.x86_hyper_vendor == X86_HYPER_VENDOR_VMWARE) {
  48                 vmware_set_feature_bits(c);
  49                 return;
  50         }
  51 }
  52
  53 void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
  54 {
  55         detect_hypervisor_vendor(c);
  56         hypervisor_set_feature_bits(c);
  57 }