Struct DmaStreamSlice

pub struct DmaStreamSlice<Dma> {
    stream: Dma,
    offset: usize,
    len: usize,
}

A slice of streaming DMA mapping.

Fields

stream: Dma

offset: usize

len: usize

Implementations

impl<Dma: AsRef<DmaStream>> DmaStreamSlice<Dma>

pub fn new(stream: Dma, offset: usize, len: usize) -> Self

Constructs a DmaStreamSlice from the DmaStream.

Panics

If the offset is greater than or equal to the length of the stream, this method will panic. If the offset + len is greater than the length of the stream, this method will panic.

pub fn stream(&self) -> &DmaStream

Returns the underlying DmaStream.

pub fn offset(&self) -> usize

Returns the offset of the slice.

pub fn nbytes(&self) -> usize

Returns the number of bytes.

pub fn sync(&self) -> Result<(), Error>

Synchronizes the slice of streaming DMA mapping with the device.

pub fn reader(&self) -> Result<VmReader<'_, Infallible>, Error>

Returns a reader to read data from it.

pub fn writer(&self) -> Result<VmWriter<'_, Infallible>, Error>

Returns a writer to write data into it.

Trait Implementations

impl<Dma: AsRef<DmaStream> + Clone> Clone for DmaStreamSlice<Dma>

fn clone(&self) -> Self

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<Dma: Debug> Debug for DmaStreamSlice<Dma>

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

Formats the value using the given formatter.

impl<Dma: AsRef<DmaStream>> HasDaddr for DmaStreamSlice<Dma>

fn daddr(&self) -> Daddr

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

impl<Dma: AsRef<DmaStream>> HasPaddr for DmaStreamSlice<Dma>

fn paddr(&self) -> Paddr

Returns the physical address.

impl<Dma: AsRef<DmaStream> + Send + Sync> VmIo for DmaStreamSlice<Dma>

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

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

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

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

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

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

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.

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

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

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.

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).