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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. typedef struct {
  41.     uint32_t cpuid_eax;
  42.     uint32_t cpuid_ebx;
  43.     uint32_t cpuid_ecx;
  44.     uint32_t cpuid_edx;
  45. } __attribute__ ((packed)) cpu_info_t;
  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.     struct __cpuid_extended_feature_info bits;
  54.     uint32_t word;
  55. } cpuid_extended_feature_info;
  56.  
  57. struct __cpuid_feature_info {
  58.     unsigned            : 23;
  59.     unsigned mmx  :  1;
  60.     unsigned fxsr :  1;
  61.     unsigned sse  :  1;
  62.     unsigned sse2 :  1;
  63.     unsigned      :  5;
  64. } __attribute__ ((packed));
  65.  
  66. typedef union cpuid_feature_info {
  67.     struct __cpuid_feature_info bits;
  68.     uint32_t word;
  69. } cpuid_feature_info;
  70.  
  71.  
  72. static inline uint32_t has_cpuid(void)
  73. {
  74.     uint32_t val, ret;
  75.    
  76.     asm volatile (
  77.         "pushf\n"                    /* read flags */
  78.         "popl %[ret]\n"
  79.         "movl %[ret], %[val]\n"
  80.        
  81.         "btcl $21, %[val]\n"         /* swap the ID bit */
  82.        
  83.         "pushl %[val]\n"             /* propagate the change into flags */
  84.         "popf\n"
  85.         "pushf\n"
  86.         "popl %[val]\n"
  87.        
  88.         "andl $(1 << 21), %[ret]\n"  /* interrested only in ID bit */
  89.         "andl $(1 << 21), %[val]\n"
  90.         "xorl %[val], %[ret]\n"
  91.         : [ret] "=r" (ret), [val] "=r" (val)
  92.     );
  93.    
  94.     return ret;
  95. }
  96.  
  97. static inline void cpuid(uint32_t cmd, cpu_info_t *info)
  98. {
  99.     asm volatile (
  100.         "cpuid\n"
  101.         : "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx),
  102.           "=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)
  103.         : "a" (cmd)
  104.     );
  105. }
  106.  
  107. #endif
  108.  
  109. /** @}
  110.  */
  111.