urts_xsave.cpp 2.4 KB

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  1. /*
  2. * Copyright (C) 2011-2018 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 "xsave.h"
  32. #include "util.h"
  33. #include "se_detect.h"
  34. #include "cpuid.h"
  35. #define XFRM_YMM_BITMASK 0x00000004
  36. uint32_t g_xsave_enabled = 0;
  37. #ifdef SE_SIM
  38. uint32_t g_xsave_mask_low = 0xFFFFFFFF;
  39. uint32_t g_xsave_mask_high = 0xFFFFFFFF;
  40. #endif
  41. extern "C" void set_xsave_info(int xsave_size, int flag);
  42. // init_xsave_info
  43. void init_xsave_info()
  44. {
  45. int xsave_size = FXSAVE_SIZE;
  46. uint64_t xcr0 = 0;
  47. if(try_read_xcr0(&xcr0))
  48. {
  49. // CPUID function 0DH, sub-function 0
  50. // EBX enums the size (in bytes) required by XSAVE for all the components currently set in XCR0
  51. int cpu_info[4] = {0};
  52. __cpuid(cpu_info, 0xD);
  53. xsave_size = cpu_info[1];
  54. g_xsave_enabled = 1;
  55. }
  56. set_xsave_info(xsave_size, (xcr0 & XFRM_YMM_BITMASK) ? 1 : 0);
  57. }