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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. /** @addtogroup ia32
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_ia32_CPUID_H_
  36. #define KERN_ia32_CPUID_H_
  37.  
  38. #include <arch/types.h>
  39.  
  40. struct cpu_info {
  41.     uint32_t cpuid_eax;
  42.     uint32_t cpuid_ebx;
  43.     uint32_t cpuid_ecx;
  44.     uint32_t cpuid_edx;
  45. } __attribute__ ((packed));
  46.  
  47. struct __cpuid_extended_feature_info {
  48.     unsigned sse3 :  1;
  49.     unsigned      : 31;
  50. } __attribute__ ((packed));
  51.  
  52. typedef union cpuid_extended_feature_info
  53. {
  54.     struct __cpuid_extended_feature_info bits;
  55.     uint32_t                                word;
  56. }cpuid_extended_feature_info;
  57.  
  58.  
  59. struct __cpuid_feature_info {
  60.     unsigned            : 23;
  61.     unsigned mmx  :  1;
  62.     unsigned fxsr :  1;
  63.     unsigned sse  :  1;
  64.     unsigned sse2 :  1;
  65.     unsigned      :  5;
  66. } __attribute__ ((packed));
  67.  
  68. typedef union cpuid_feature_info
  69. {
  70.     struct __cpuid_feature_info bits;
  71.     uint32_t                word       ;
  72. }cpuid_feature_info;
  73.  
  74.  
  75. static inline uint32_t has_cpuid(void)
  76. {
  77.     uint32_t val, ret;
  78.    
  79.     __asm__ volatile (
  80.         "pushf\n"               /* read flags */
  81.         "popl %0\n"
  82.         "movl %0, %1\n"
  83.        
  84.         "btcl $21, %1\n"        /* swap the ID bit */
  85.        
  86.         "pushl %1\n"            /* propagate the change into flags */
  87.         "popf\n"
  88.         "pushf\n"
  89.         "popl %1\n"
  90.        
  91.         "andl $(1 << 21), %0\n" /* interrested only in ID bit */
  92.         "andl $(1 << 21), %1\n"
  93.         "xorl %1, %0\n"
  94.         : "=r" (ret), "=r" (val)
  95.     );
  96.    
  97.     return ret;
  98. }
  99.  
  100. static inline void cpuid(uint32_t cmd, struct cpu_info *info)
  101. {
  102.     __asm__ volatile (
  103.         "movl %4, %%eax\n"
  104.         "cpuid\n"
  105.        
  106.         "movl %%eax, %0\n"
  107.         "movl %%ebx, %1\n"
  108.         "movl %%ecx, %2\n"
  109.         "movl %%edx, %3\n"
  110.         : "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx)
  111.         : "m" (cmd)
  112.         : "eax", "ebx", "ecx", "edx"
  113.     );
  114. }
  115.  
  116. #endif
  117.  
  118. /** @}
  119.  */
  120.