Struct sunrise_kernel::paging::cross_process::CrossProcessMapping

pub struct CrossProcessMapping {
    kernel_address: VirtualAddress,
    len: usize,
    mapping: Mapping,
}

A struct representing a UserLand mapping mirrored in KernelSpace.

Fields

kernel_address: VirtualAddress

The KernelLand address it was remapped to. Has the desired offset.

len: usize

Length of the region that was requested to be remapped. Note that the actual remapped region may be larger (since a Page Table mapping might need to be at least 4KB).

mapping: Mapping

The frames this mapping covers.

Implementations

impl CrossProcessMapping

pub fn mirror_mapping(
    mapping: &Mapping,
    offset: usize,
    len: usize
) -> Result<CrossProcessMapping, KernelError>

Creates an CrossProcessMapping.

Remaps a subsection of the mapping in KernelLand.

The offset is a byte offset in the Mapping's underlying physical frames. If the mapping already had an offset, those are summed. For instance, a mapping with 3 frames and an offset at 0x1000, mirror_mapped with an offset of 0x1000, will result in mirror mapping from the third frame.

The length is a byte length to mirror map. It's allowed to be smaller than the length of the underlying mapping.

Error

• Error if the mapping is not Shared, as only refcounted mappings can be owned.
• Error if offset + len > mapping length.
• Error if offset + len would overflow.
• Error if len is 0.

Panics

• Panics if mapping.phys_offset() + offset overflows.

pub fn addr(&self) -> VirtualAddress

The address of the region asked to be remapped.

pub fn len(&self) -> usize

The length of the region asked to be remapped.

Trait Implementations

impl Debug for CrossProcessMapping

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

Formats the value using the given formatter.

impl Drop for CrossProcessMapping

fn drop(&mut self)

Executes the destructor for this type.