Struct BasicMemoryInfoTag

#[repr(C)]
pub struct BasicMemoryInfoTag { /* private fields */ }

Basic memory info tag.

This tag includes “basic memory information”. This means (legacy) lower and upper memory: In Real Mode (modeled after the 8086), only the first 1MB of memory is accessible. Typically, the region between 640KB and 1MB is not freely usable, because it is used for memory-mapped IO, for instance. The term “lower memory” refers to those first 640KB of memory that are freely usable for an application in Real Mode. “Upper memory” then refers to the next freely usable chunk of memory, starting at 1MB up to about 10MB, in practice. This is the memory an application running on a 286 (which had a 24-bit address bus) could use, historically.

Nowadays, much bigger chunks of continuous memory are available at higher addresses, but the Multiboot standard still references those two terms.

Implementations

impl BasicMemoryInfoTag

pub fn new(memory_lower: u32, memory_upper: u32) -> Self

Constructs a new tag.

pub const fn memory_lower(&self) -> u32

Returns the lower memory bound.

pub const fn memory_upper(&self) -> u32

Returns the upper memory bound.

Trait Implementations

impl Clone for BasicMemoryInfoTag

fn clone(&self) -> BasicMemoryInfoTag

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for BasicMemoryInfoTag

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

Formats the value using the given formatter.

impl Hash for BasicMemoryInfoTag

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 MaybeDynSized for BasicMemoryInfoTag

const BASE_SIZE: usize = 16usize

The true base size of the struct without any implicit or additional padding. Note that size_of::<T>() isn’t sufficient, as for example the type could have three u32 fields, which would add an implicit u32 padding. However, this constant must always fulfill BASE_SIZE >= size_of::<Self::Header>().

type Header = TagHeader

The associated Header of this tag.

fn dst_len(_: &TagHeader)

Returns the amount of items in the dynamically sized portion of the DST. Note that this is not the amount of bytes. So if the dynamically sized portion is 16 bytes in size and each element is 4 bytes big, then this function must return 4.

fn header(&self) -> &Self::Header

Returns the corresponding Header.

fn payload(&self) -> &[u8]

Returns the payload, i.e., all memory that is not occupied by the Header of the type.

fn as_bytes(&self) -> BytesRef<'_, Self::Header>

Returns the whole allocated bytes for this structure encapsulated in BytesRef. This includes padding bytes. To only get the “true” tag data, read the tag size from Self::header and create a sub slice.

fn as_ptr(&self) -> *const Self::Header

Returns a pointer to this structure.

impl Ord for BasicMemoryInfoTag

fn cmp(&self, other: &BasicMemoryInfoTag) -> 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.

impl PartialEq for BasicMemoryInfoTag

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for BasicMemoryInfoTag

fn partial_cmp(&self, other: &BasicMemoryInfoTag) -> 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 Tag for BasicMemoryInfoTag

const ID: TagType = TagType::BasicMeminfo

The ID of this tag. This should be unique across all implementors.

type IDType = TagType

The ID type that identifies the tag.

impl Copy for BasicMemoryInfoTag

impl Eq for BasicMemoryInfoTag

impl StructuralPartialEq for BasicMemoryInfoTag