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  1. /*
  2.  * Copyright (C) 2001-2004 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __ia32_CPUID_H__
  30. #define __ia32_CPUID_H__
  31.  
  32. #include <arch/types.h>
  33.  
  34. struct cpu_info {
  35.     __u32 cpuid_eax;
  36.     __u32 cpuid_ebx;
  37.     __u32 cpuid_ecx;
  38.     __u32 cpuid_edx;
  39. } __attribute__ ((packed));
  40.  
  41. struct __cpuid_extended_feature_info {
  42.     unsigned sse3 :  1;
  43.     unsigned      : 31;
  44. } __attribute__ ((packed));
  45.  
  46. typedef union cpuid_extended_feature_info
  47. {
  48.     struct __cpuid_extended_feature_info bits;
  49.     __u32                                word;
  50. }cpuid_extended_feature_info;
  51.  
  52.  
  53. struct __cpuid_feature_info {
  54.     unsigned            : 23;
  55.     unsigned mmx  :  1;
  56.     unsigned fxsr :  1;
  57.     unsigned sse  :  1;
  58.     unsigned sse2 :  1;
  59.     unsigned      :  5;
  60. } __attribute__ ((packed));
  61.  
  62. typedef union cpuid_feature_info
  63. {
  64.     struct __cpuid_feature_info bits;
  65.     __u32                word       ;
  66. }cpuid_feature_info;
  67.  
  68.  
  69. static inline __u32 has_cpuid(void)
  70. {
  71.     __u32 val, ret;
  72.    
  73.     __asm__ volatile (
  74.         "pushf\n"               /* read flags */
  75.         "popl %0\n"
  76.         "movl %0, %1\n"
  77.        
  78.         "btcl $21, %1\n"        /* swap the ID bit */
  79.        
  80.         "pushl %1\n"            /* propagate the change into flags */
  81.         "popf\n"
  82.         "pushf\n"
  83.         "popl %1\n"
  84.        
  85.         "andl $(1 << 21), %0\n" /* interrested only in ID bit */
  86.         "andl $(1 << 21), %1\n"
  87.         "xorl %1, %0\n"
  88.         : "=r" (ret), "=r" (val)
  89.     );
  90.    
  91.     return ret;
  92. }
  93.  
  94. static inline void cpuid(__u32 cmd, struct cpu_info *info)
  95. {
  96.     __asm__ volatile (
  97.         "movl %4, %%eax\n"
  98.         "cpuid\n"
  99.        
  100.         "movl %%eax, %0\n"
  101.         "movl %%ebx, %1\n"
  102.         "movl %%ecx, %2\n"
  103.         "movl %%edx, %3\n"
  104.         : "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx)
  105.         : "m" (cmd)
  106.         : "eax", "ebx", "ecx", "edx"
  107.     );
  108. }
  109.  
  110. #endif
  111.