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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. #define INTEL_CPUID_LEVEL     0x00000000
  39. #define INTEL_CPUID_STANDARD  0x00000001
  40. #define INTEL_PSE             3
  41. #define INTEL_SEP             11
  42.  
  43. #ifndef __ASM__
  44.  
  45. #include <arch/types.h>
  46.  
  47. typedef struct {
  48.     uint32_t cpuid_eax;
  49.     uint32_t cpuid_ebx;
  50.     uint32_t cpuid_ecx;
  51.     uint32_t cpuid_edx;
  52. } __attribute__ ((packed)) cpu_info_t;
  53.  
  54. struct __cpuid_extended_feature_info {
  55.     unsigned sse3 :  1;
  56.     unsigned      : 31;
  57. } __attribute__ ((packed));
  58.  
  59. typedef union cpuid_extended_feature_info {
  60.     struct __cpuid_extended_feature_info bits;
  61.     uint32_t word;
  62. } cpuid_extended_feature_info;
  63.  
  64. struct __cpuid_feature_info {
  65.     unsigned            : 23;
  66.     unsigned mmx  :  1;
  67.     unsigned fxsr :  1;
  68.     unsigned sse  :  1;
  69.     unsigned sse2 :  1;
  70.     unsigned      :  5;
  71. } __attribute__ ((packed));
  72.  
  73. typedef union cpuid_feature_info {
  74.     struct __cpuid_feature_info bits;
  75.     uint32_t word;
  76. } cpuid_feature_info;
  77.  
  78.  
  79. static inline uint32_t has_cpuid(void)
  80. {
  81.     uint32_t val, ret;
  82.    
  83.     asm volatile (
  84.         "pushf\n"                    /* read flags */
  85.         "popl %[ret]\n"
  86.         "movl %[ret], %[val]\n"
  87.        
  88.         "btcl $21, %[val]\n"         /* swap the ID bit */
  89.        
  90.         "pushl %[val]\n"             /* propagate the change into flags */
  91.         "popf\n"
  92.         "pushf\n"
  93.         "popl %[val]\n"
  94.        
  95.         "andl $(1 << 21), %[ret]\n"  /* interrested only in ID bit */
  96.         "andl $(1 << 21), %[val]\n"
  97.         "xorl %[val], %[ret]\n"
  98.         : [ret] "=r" (ret), [val] "=r" (val)
  99.     );
  100.    
  101.     return ret;
  102. }
  103.  
  104. static inline void cpuid(uint32_t cmd, cpu_info_t *info)
  105. {
  106.     asm volatile (
  107.         "cpuid\n"
  108.         : "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx),
  109.           "=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)
  110.         : "a" (cmd)
  111.     );
  112. }
  113.  
  114. #endif /* !def __ASM__ */
  115. #endif
  116.  
  117. /** @}
  118.  */
  119.