cpuid.c 2.3 KB

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  1. /* ===================================================================
  2. *
  3. * Copyright (c) 2014, Legrandin <helderijs@gmail.com>
  4. * All rights reserved.
  5. *
  6. * Redistribution and use in source and binary forms, with or without
  7. * modification, are permitted provided that the following conditions
  8. * are met:
  9. *
  10. * 1. Redistributions of source code must retain the above copyright
  11. * notice, this list of conditions and the following disclaimer.
  12. * 2. Redistributions in binary form must reproduce the above copyright
  13. * notice, this list of conditions and the following disclaimer in
  14. * the documentation and/or other materials provided with the
  15. * distribution.
  16. *
  17. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  20. * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  21. * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  22. * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  23. * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  24. * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  25. * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27. * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28. * POSSIBILITY OF SUCH DAMAGE.
  29. * ===================================================================
  30. */
  31. #include "common.h"
  32. FAKE_INIT(cpuid_c)
  33. #if defined HAVE_CPUID_H
  34. #include <cpuid.h>
  35. #elif defined HAVE_INTRIN_H
  36. #include <intrin.h>
  37. #endif
  38. /** Call X86 CPUID for Leaf 1: return CX **/
  39. static uint32_t leaf1_ecx(void)
  40. {
  41. uint32_t info[4];
  42. memset(info, 0, sizeof info);
  43. #if defined(HAVE_CPUID_H)
  44. __get_cpuid(1, info, info+1, info+2, info+3);
  45. #elif defined(HAVE_INTRIN_H)
  46. __cpuidex(info, 1, 0);
  47. #endif
  48. return info[2];
  49. }
  50. /** Return 1 if the CPU supports the AESNI extension **/
  51. EXPORT_SYM int have_aes_ni(void)
  52. {
  53. uint32_t ecx;
  54. ecx = leaf1_ecx();
  55. return (ecx & (1UL<<25)) ? 1 : 0;
  56. }
  57. /** Return non-zero if the CPU supports the PCLMULQDQ instruction (carry-less
  58. * multiplication). **/
  59. EXPORT_SYM int have_clmul(void)
  60. {
  61. uint32_t ecx;
  62. ecx = leaf1_ecx();
  63. return (ecx >> 1) & 1;
  64. }