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/// Several system calls take a flag to request "hugetlb" huge pages.
/// Without further specification, these system calls will use the
/// system's default huge page size.  If a system supports multiple
/// huge page sizes, the desired huge page size can be specified in
/// bits [26:31] of the flag arguments.  The value in these 6 bits
/// will encode the log2 of the huge page size.
///
/// The following definitions are associated with this huge page size
/// encoding in flag arguments.  System call specific header files
/// that use this encoding should include this file.  They can then
/// provide definitions based on these with their own specific prefix.
/// for example:
/// #define MAP_HUGE_SHIFT HUGETLB_FLAG_ENCODE_SHIFT

pub const HUGETLB_FLAG_ENCODE_SHIFT: i32 = 26;
pub const HUGETLB_FLAG_ENCODE_MASK: i32 = 0x3f;

pub const HUGETLB_FLAG_ENCODE_64KB: usize = (16 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_512KB: usize = (19 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_1MB: usize = (20 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_2MB: usize = (21 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_8MB: usize = (23 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_16MB: usize = (24 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_32MB: usize = (25 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_256MB: usize = (28 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_512MB: usize = (29 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_1GB: usize = (30 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_2GB: usize = (31 << HUGETLB_FLAG_ENCODE_SHIFT);
pub const HUGETLB_FLAG_ENCODE_16GB: usize = (34 << HUGETLB_FLAG_ENCODE_SHIFT);