Struct DmaCoherent Copy item path

impl DmaCoherent

pub fn map(segment: USegment, is_cache_coherent: bool) -> Result<Self, DmaError>

Creates a coherent DMA mapping backed by segment.

The is_cache_coherent argument specifies whether the target device that the DMA mapping is prepared for can access the main memory in a CPU cache coherent way or not.

The method fails if any part of the given segment already belongs to a DMA mapping.

pub fn nbytes(&self) -> usize

Returns the number of bytes in the DMA mapping.

impl<'a> DmaCoherent

pub fn reader(&'a self) -> VmReader<'a, Infallible>

Returns a reader to read data from it.

pub fn writer(&'a self) -> VmWriter<'a, Infallible>

Returns a writer to write data into it.

Methods from Deref<Target = USegment>§

pub fn start_paddr(&self) -> Paddr

Gets the start physical address of the contiguous frames.

pub fn end_paddr(&self) -> Paddr

Gets the end physical address of the contiguous frames.

pub fn size(&self) -> usize

Gets the length in bytes of the contiguous frames.

pub fn slice(&self, range: &Range<usize>) -> Self

Gets an extra handle to the frames in the byte offset range.

The sliced byte offset range in indexed by the offset from the start of the contiguous frames. The resulting frames holds extra reference counts.

§Panics

The function panics if the byte offset range is out of bounds, or if any of the ends of the byte offset range is not base-page aligned.

Trait Implementations§

impl Clone for DmaCoherent

fn clone(&self) -> DmaCoherent

Returns a copy of the value. Read more

1.0.0 · Source§

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

Performs copy-assignment from source. Read more

impl Debug for DmaCoherent

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

Formats the value using the given formatter. Read more

impl Deref for DmaCoherent

type Target = Segment<dyn AnyUFrameMeta>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl HasDaddr for DmaCoherent

fn daddr(&self) -> Daddr

Gets the base address of the mapping in the device address space.

impl HasPaddr for DmaCoherent

fn paddr(&self) -> Paddr

Returns the physical address.

impl VmIo for DmaCoherent

fn read(&self, offset: usize, writer: &mut VmWriter<'_>) -> Result<()>

Reads requested data at a specified offset into a given VmWriter. Read more

fn write(&self, offset: usize, reader: &mut VmReader<'_>) -> Result<()>

Writes all data from a given VmReader at a specified offset. Read more

fn read_bytes(&self, offset: usize, buf: &mut [u8]) -> Result<()>

Reads a specified number of bytes at a specified offset into a given buffer. Read more

fn read_val<T: Pod>(&self, offset: usize) -> Result<T>

Reads a value of a specified type at a specified offset.

fn read_slice<T: Pod>(&self, offset: usize, slice: &mut [T]) -> Result<()>

Reads a slice of a specified type at a specified offset. Read more

fn write_bytes(&self, offset: usize, buf: &[u8]) -> Result<()>

Writes a specified number of bytes from a given buffer at a specified offset. Read more

fn write_val<T: Pod>(&self, offset: usize, new_val: &T) -> Result<()>

Writes a value of a specified type at a specified offset.

fn write_slice<T: Pod>(&self, offset: usize, slice: &[T]) -> Result<()>

Writes a slice of a specified type at a specified offset. Read more

fn write_vals<'a, T: Pod + 'a, I: Iterator<Item = &'a T>>( &self, offset: usize, iter: I, align: usize, ) -> Result<usize>

Writes a sequence of values given by an iterator (iter) from the specified offset (offset). Read more

impl VmIoOnce for DmaCoherent

fn read_once<T: PodOnce>(&self, offset: usize) -> Result<T>

Reads a value of the PodOnce type at the specified offset using one non-tearing memory load. Read more

fn write_once<T: PodOnce>(&self, offset: usize, new_val: &T) -> Result<()>

Writes a value of the PodOnce type at the specified offset using one non-tearing memory store. Read more

Auto Trait Implementations§

impl !UnwindSafe for DmaCoherent

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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Immutably borrows from an owned value. Read more

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Mutably borrows from an owned value. Read more

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where T: Clone,

unsafe fn clone_to_uninit(&self, dst: *mut u8)

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

Performs copy-assignment from self to dst. Read more

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Causes self to use its Binary implementation when Debug-formatted.

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Causes self to use its Display implementation when Debug-formatted.

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Causes self to use its LowerExp implementation when Debug-formatted.

fn fmt_lower_hex(self) -> FmtLowerHex<Self>
where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.

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Causes self to use its Octal implementation when Debug-formatted.

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Causes self to use its Pointer implementation when Debug-formatted.

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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.

fn fmt_upper_hex(self) -> FmtUpperHex<Self>
where Self: UpperHex,

Causes self to use its UpperHex implementation when Debug-formatted.

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Formats each item in a sequence. Read more

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Returns the argument unchanged.

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Calls U::from(self).

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