Enum PageSize 

#[repr(usize)]
pub enum PageSize {
    K4 = 4_096,
    K16 = 16_384,
    K64 = 65_536,
}

Strongly-typed virtual memory page size representing hardware MMU translation granules

Across supported operating systems and CPU architectures, base virtual memory page sizes form a strictly bounded set corresponding to hardware translation granules:

• 4 KiB (4,096 bytes): Standard on x86/x86_64, Windows, and default Linux AArch64
• 16 KiB (16,384 bytes): Apple Silicon macOS and 16k Linux kernels
• 64 KiB (65,536 bytes): Enterprise Linux AArch64 (RHEL, CentOS Stream, Amazon Linux)

Example

use frozen_core::memmap::PageSize;

let ps = PageSize::try_from(4096).unwrap();
assert_eq!(ps, PageSize::K4);
assert_eq!(ps.as_usize(), 4096);
assert_eq!(ps.as_u32(), 4096);
assert!(ps.is_power_of_two());

Variants

K4 = 4_096

4 KiB (4,096 bytes) - Standard x86_64, Windows, and default Linux AArch64

K16 = 16_384

16 KiB (16,384 bytes) - Native Apple Silicon macOS and 16k Linux kernels

K64 = 65_536

64 KiB (65,536 bytes) - Enterprise Linux AArch64 (RHEL, CentOS, Amazon Linux)

Implementations

impl PageSize

pub const fn as_usize(self) -> usize

Returns the page size in bytes as usize

pub const fn as_u32(self) -> u32

Returns the page size in bytes as u32

pub const fn is_power_of_two(self) -> bool

Returns true since all valid hardware page sizes are powers of two

pub fn validate_platform(self) -> FrozenResult<Self>

Validates whether this page size is supported on the active host operating system and architecture

Platform rules

• Windows: Only PageSize::K4 (4096 bytes) is valid
• macOS: PageSize::K16 or PageSize::K4 on aarch64; PageSize::K4 on x86_64
• Linux: PageSize::K4 on x86/x86_64; PageSize::K4, PageSize::K16, PageSize::K64

Trait Implementations

impl Clone for PageSize

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for PageSize

impl Debug for PageSize

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for PageSize

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for PageSize

impl From<PageSize> for usize

fn from(ps: PageSize) -> Self

Converts to this type from the input type.

impl From<PageSize> for u32

fn from(ps: PageSize) -> Self

Converts to this type from the input type.

impl From<PageSize> for u64

fn from(ps: PageSize) -> Self

Converts to this type from the input type.

impl Hash for PageSize

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PageSize

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for PageSize

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for PageSize

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for PageSize

impl TryFrom<usize> for PageSize

type Error = FrozenError

The type returned in the event of a conversion error.

fn try_from(size: usize) -> Result<Self, Self::Error>

Performs the conversion.