se_detect.cpp 3.1 KB

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  1. /*
  2. * Copyright (C) 2011-2017 Intel Corporation. All rights reserved.
  3. *
  4. * Redistribution and use in source and binary forms, with or without
  5. * modification, are permitted provided that the following conditions
  6. * are met:
  7. *
  8. * * Redistributions of source code must retain the above copyright
  9. * notice, this list of conditions and the following disclaimer.
  10. * * Redistributions in binary form must reproduce the above copyright
  11. * notice, this list of conditions and the following disclaimer in
  12. * the documentation and/or other materials provided with the
  13. * distribution.
  14. * * Neither the name of Intel Corporation nor the names of its
  15. * contributors may be used to endorse or promote products derived
  16. * from this software without specific prior written permission.
  17. *
  18. * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19. * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20. * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21. * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22. * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23. * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24. * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25. * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26. * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27. * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28. * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29. *
  30. */
  31. #include "se_detect.h"
  32. #include "cpuid.h"
  33. bool is_se_supported()
  34. {
  35. int cpu_info[4] = {0, 0, 0, 0};
  36. __cpuidex(cpu_info, CPUID_FEATURE_FLAGS, 0);
  37. if (!(cpu_info[1] & (1<<SE_FEATURE_SHIFT)))
  38. {
  39. return false;
  40. }
  41. __cpuidex(cpu_info, SE_LEAF, 0);
  42. if(!(cpu_info[0] & (1 << SE1_SHIFT)))
  43. return false;
  44. return true;
  45. }
  46. #include "read_xcr0.h"
  47. bool try_read_xcr0(uint64_t *value)
  48. {
  49. //check if xgetbv instruction is supported
  50. int cpu_info[4] = {0, 0, 0, 0};
  51. __cpuid(cpu_info, 1);
  52. if(!(cpu_info[2] & (1<<XSAVE_SHIFT)) || !(cpu_info[2] & (1<<OSXSAVE_SHIFT))) //ecx[27:26] indicate whether supoort xsave/xrstor, and whether enable xgetbv, xsetbv
  53. return false;
  54. *value = read_xcr0();
  55. return true;
  56. }
  57. bool get_plat_cap_by_cpuid(sgx_misc_attribute_t *se_misc_attr)
  58. {
  59. int cpu_info[4] = {0, 0, 0, 0};
  60. if(!is_se_supported())
  61. return false;
  62. __cpuidex(cpu_info, SE_LEAF, 1);
  63. //enclave capability
  64. se_misc_attr->secs_attr.flags = ((uint64_t)cpu_info[1] << 32) | cpu_info[0];
  65. if(false == try_read_xcr0(&se_misc_attr->secs_attr.xfrm))
  66. {
  67. se_misc_attr->secs_attr.xfrm = SGX_XFRM_LEGACY;
  68. }
  69. //If x-feature is supported and enabled by OS, we need make sure it is also supported in se.
  70. else
  71. {
  72. se_misc_attr->secs_attr.xfrm &= (((uint64_t)cpu_info[3] << 32) | cpu_info[2]);
  73. }
  74. // use cpuid to get the misc_select
  75. __cpuidex(cpu_info, SE_LEAF, 0);
  76. se_misc_attr->misc_select = cpu_info[1];
  77. return true;
  78. }