release/src-rt-6.x.4708/linux/linux-2.6.36/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 <linux/module.h>
  25 #include <asm/processor.h>
  26 #include <asm/hypervisor.h>
  27
  28 /*
  29  * Hypervisor detect order.  This is specified explicitly here because
  30  * some hypervisors might implement compatibility modes for other
  31  * hypervisors and therefore need to be detected in specific sequence.
  32  */
  33 static const __initconst struct hypervisor_x86 * const hypervisors[] =
  34 {
  35         &x86_hyper_vmware,
  36         &x86_hyper_ms_hyperv,
  37 #ifdef CONFIG_XEN_PVHVM
  38         &x86_hyper_xen_hvm,
  39 #endif
  40 };
  41
  42 const struct hypervisor_x86 *x86_hyper;
  43 EXPORT_SYMBOL(x86_hyper);
  44
  45 static inline void __init
  46 detect_hypervisor_vendor(void)
  47 {
  48         const struct hypervisor_x86 *h, * const *p;
  49
  50         for (p = hypervisors; p < hypervisors + ARRAY_SIZE(hypervisors); p++) {
  51                 h = *p;
  52                 if (h->detect()) {
  53                         x86_hyper = h;
  54                         printk(KERN_INFO "Hypervisor detected: %s\n", h->name);
  55                         break;
  56                 }
  57         }
  58 }
  59
  60 void __cpuinit init_hypervisor(struct cpuinfo_x86 *c)
  61 {
  62         if (x86_hyper && x86_hyper->set_cpu_features)
  63                 x86_hyper->set_cpu_features(c);
  64 }
  65
  66 void __init init_hypervisor_platform(void)
  67 {
  68
  69         detect_hypervisor_vendor();
  70
  71         if (!x86_hyper)
  72                 return;
  73
  74         init_hypervisor(&boot_cpu_data);
  75
  76         if (x86_hyper->init_platform)
  77                 x86_hyper->init_platform();
  78 }