Struct multiboot2::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

pub fn memory_lower(&self) -> u32

pub fn memory_upper(&self) -> u32

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 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 + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for BasicMemoryInfoTag

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

This method tests for self and other values to be equal, and is used by ==.

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

This method 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

This method tests less than (for self and other) and is used by the < operator.

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

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

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

This method tests greater than (for self and other) and is used by the > operator.

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

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

impl TagTrait for BasicMemoryInfoTag

const ID: TagType = TagType::BasicMeminfo

The numeric ID of this tag.

fn dst_size(_base_tag: &Tag)

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 as_base_tag(&self) -> &Tag

Returns the tag as the common base tag structure.

fn size(&self) -> usize

Returns the total size of the tag. The depends on the size field of the tag.

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

Returns a slice to the underlying bytes of the tag. This includes all bytes, also for tags that are DSTs. The slice length depends on the size field of the tag.

unsafe fn from_base_tag(tag: &Tag) -> &Self

Creates a reference to a (dynamically sized) tag type in a safe way. DST tags need to implement a proper Self::dst_size implementation.

impl Copy for BasicMemoryInfoTag

impl Eq for BasicMemoryInfoTag

impl StructuralPartialEq for BasicMemoryInfoTag