Struct MappingContext 

pub struct MappingContext {
    pub user_vmar: Vmar,
    pub user_vmar_info: VmarInfo,
    pub private_anonymous: PrivateAnonymousMemoryManager,
}

State and resources of the MemoryManager that are either immutable after creation or handle their own interior mutability (e.g., private_anonymous).

This is distinct from MemoryManagerState in that the fields here do not require acquisition of the MemoryManager’s main lock for access. This allows concurrent access to these resources without lock contention.

This structure primarily holds the Zircon VMAR handle and the manager for private anonymous memory, which are the core primitives used to manipulate the address space.

Fields

user_vmar: Vmar

The VMAR in which userspace mappings occur.

We map userspace memory in this child VMAR so that we can destroy the entire VMAR during exec. For 32-bit tasks, we limit the user_vmar to correspond to the available memory.

This field is set to ZX_HANDLE_INVALID when the address-space has been destroyed (e.g. on exec()), allowing the value to be pro-actively checked for, or the ZX_ERR_BAD_HANDLE status return from Zircon operations handled, to suit the call-site.

user_vmar_info: VmarInfo

Cached VmarInfo for user_vmar.

private_anonymous: PrivateAnonymousMemoryManager

Memory object backing private, anonymous memory allocations in this address space.

Implementations

impl MappingContext

pub fn max_address(&self) -> UserAddress