Struct TaskContext 

pub struct TaskContext { /* private fields */ }

Saved hardware states of a task.

The context usually includes:

• Callee-saved registers
• Stack pointer register
• Thread pointer register (for kernel-space thread-local storage)
• FP/SIMD registers

On context switch, current task saves its context from CPU to memory, and the next task restores its context from memory to CPU.

Implementations

impl TaskContext

pub fn new() -> Self

Creates a dummy context for a new task.

Note the context is not initialized, it will be filled by switch_to_prepared (for initial tasks) and init (for regular tasks) methods.

pub fn init( &mut self, entry: usize, kstack_top: VirtAddr, kernel_tls: KernelTlsBase, )

Initializes the context for a new task, with the given entry point and kernel stack.

pub fn set_context_header(&mut self, header: NonNull<ExecutionContextHeader>)

Sets the pinned task-owned execution-context header.

pub const fn context_header(&self) -> Option<NonNull<ExecutionContextHeader>>

Returns the configured task-owned execution-context header.

pub fn prepare_switch_to(&mut self, _next_ctx: &Self)

Completes FP/SIMD work before current-context publication.

pub unsafe fn switch_to_prepared( &mut self, next_ctx: &Self, prepared: PreparedContextSwitch<'_>, )

Performs only the final GPR/current/TLS transfer.

Safety

Scheduling must be serialized, FP state prepared, and the next current header published. No fallible Rust work may follow before this call.

Trait Implementations

impl Debug for TaskContext

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

Formats the value using the given formatter.

impl Default for TaskContext

fn default() -> TaskContext

Returns the “default value” for a type.