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asm-generic
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hugetlb_encode.h

hugetlb_encode.h 1.8 KB
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  1. #ifndef _ASM_GENERIC_HUGETLB_ENCODE_H_
    2. 

  2. #define _ASM_GENERIC_HUGETLB_ENCODE_H_
    3. 

  3. 

  4. /*
    5. 

  5.  * Several system calls take a flag to request "hugetlb" huge pages.
    6. 

  6.  * Without further specification, these system calls will use the
    7. 

  7.  * system's default huge page size.  If a system supports multiple
    8. 

  8.  * huge page sizes, the desired huge page size can be specified in
    9. 

  9.  * bits [26:31] of the flag arguments.  The value in these 6 bits
    10. 

  10.  * will encode the log2 of the huge page size.
    11. 

  11.  *
    12. 

  12.  * The following definitions are associated with this huge page size
    13. 

  13.  * encoding in flag arguments.  System call specific header files
    14. 

  14.  * that use this encoding should include this file.  They can then
    15. 

  15.  * provide definitions based on these with their own specific prefix.
    16. 

  16.  * for example:
    17. 

  17.  * #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT
    18. 

  18.  */
    19. 

  19. 

  20. #define HUGETLB_FLAG_ENCODE_SHIFT	26
    21. 

  21. #define HUGETLB_FLAG_ENCODE_MASK	0x3f
    22. 

  22. 

  23. #define HUGETLB_FLAG_ENCODE_16KB	(14U << HUGETLB_FLAG_ENCODE_SHIFT)
    24. 

  24. #define HUGETLB_FLAG_ENCODE_64KB	(16U << HUGETLB_FLAG_ENCODE_SHIFT)
    25. 

  25. #define HUGETLB_FLAG_ENCODE_512KB	(19U << HUGETLB_FLAG_ENCODE_SHIFT)
    26. 

  26. #define HUGETLB_FLAG_ENCODE_1MB		(20U << HUGETLB_FLAG_ENCODE_SHIFT)
    27. 

  27. #define HUGETLB_FLAG_ENCODE_2MB		(21U << HUGETLB_FLAG_ENCODE_SHIFT)
    28. 

  28. #define HUGETLB_FLAG_ENCODE_8MB		(23U << HUGETLB_FLAG_ENCODE_SHIFT)
    29. 

  29. #define HUGETLB_FLAG_ENCODE_16MB	(24U << HUGETLB_FLAG_ENCODE_SHIFT)
    30. 

  30. #define HUGETLB_FLAG_ENCODE_32MB	(25U << HUGETLB_FLAG_ENCODE_SHIFT)
    31. 

  31. #define HUGETLB_FLAG_ENCODE_256MB	(28U << HUGETLB_FLAG_ENCODE_SHIFT)
    32. 

  32. #define HUGETLB_FLAG_ENCODE_512MB	(29U << HUGETLB_FLAG_ENCODE_SHIFT)
    33. 

  33. #define HUGETLB_FLAG_ENCODE_1GB		(30U << HUGETLB_FLAG_ENCODE_SHIFT)
    34. 

  34. #define HUGETLB_FLAG_ENCODE_2GB		(31U << HUGETLB_FLAG_ENCODE_SHIFT)
    35. 

  35. #define HUGETLB_FLAG_ENCODE_16GB	(34U << HUGETLB_FLAG_ENCODE_SHIFT)
    36. 

  36. 

  37. #endif /* _ASM_GENERIC_HUGETLB_ENCODE_H_ */
    38.