Struct taskctx::TaskContext

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pub struct TaskContext {
    pub kstack_top: VirtAddr,
    pub rsp: u64,
    pub fs_base: usize,
    pub ext_state: ExtendedState,
}
Expand description

Saved hardware states of a task.

The context usually includes:

  • Callee-saved registers
  • Stack pointer register
  • Thread pointer register (for thread-local storage, currently unsupported)
  • 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.

On x86_64, callee-saved registers are saved to the kernel stack by the PUSH instruction. So that rsp is the RSP after callee-saved registers are pushed, and kstack_top is the top of the kernel stack (RSP before any push).

Fields§

§kstack_top: VirtAddr

The kernel stack top of the task.

§rsp: u64

RSP after all callee-saved registers are pushed.

§fs_base: usize

Thread Local Storage (TLS).

§ext_state: ExtendedState

Extended states, i.e., FP/SIMD states.

Implementations§

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impl TaskContext

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pub const fn new() -> Self

Creates a new default context for a new task.

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

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

Trait Implementations§

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impl Debug for TaskContext

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

Formats the value using the given formatter. Read more

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