mem_encrypt.h 885 B

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  1. /* SPDX-License-Identifier: GPL-2.0-only */
  2. /*
  3. * AMD Memory Encryption Support
  4. *
  5. * Copyright (C) 2016 Advanced Micro Devices, Inc.
  6. *
  7. * Author: Tom Lendacky <thomas.lendacky@amd.com>
  8. */
  9. #ifndef __MEM_ENCRYPT_H__
  10. #define __MEM_ENCRYPT_H__
  11. #ifndef __ASSEMBLY__
  12. #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
  13. #include <asm/mem_encrypt.h>
  14. #else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
  15. static inline bool mem_encrypt_active(void) { return false; }
  16. #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
  17. #ifdef CONFIG_AMD_MEM_ENCRYPT
  18. /*
  19. * The __sme_set() and __sme_clr() macros are useful for adding or removing
  20. * the encryption mask from a value (e.g. when dealing with pagetable
  21. * entries).
  22. */
  23. #define __sme_set(x) ((x) | sme_me_mask)
  24. #define __sme_clr(x) ((x) & ~sme_me_mask)
  25. #else
  26. #define __sme_set(x) (x)
  27. #define __sme_clr(x) (x)
  28. #endif
  29. #endif /* __ASSEMBLY__ */
  30. #endif /* __MEM_ENCRYPT_H__ */