Struct ostd::cpu::FpRegs

#[repr(C)]
pub struct FpRegs { /* private fields */ }

The floating-point state of CPU.

Implementations

impl FpRegs

pub fn new() -> Self

Creates a new instance.

Note that a newly-created instance’s floating point state is not initialized, thus considered invalid (i.e., self.is_valid() == false).

pub fn save(&mut self)

Save CPU’s current floating pointer states into this instance.

pub unsafe fn save_from_slice(&mut self, src: &[u8])

Saves the floating state given by a slice of u8.

After calling this method, the state of the instance will be considered valid.

Safety

It is the caller’s responsibility to ensure that the source slice contains data that is in xsave/xrstor format. The slice must have a length of 512 bytes.

pub fn is_valid(&self) -> bool

Returns whether the instance can contains data in valid xsave/xrstor format.

pub fn clear(&mut self)

Clears the state of the instance.

This method does not reset the underlying buffer that contains the floating point state; it only marks the buffer invalid.

pub fn restore(&self)

Restores CPU’s CPU floating pointer states from this instance.

Panics

If the current state is invalid, the method will panic.

pub fn as_slice(&self) -> &[u8]

Returns the floating point state as a slice.

Note that the slice may contain garbage if self.is_valid() == false.

Trait Implementations

impl Clone for FpRegs

fn clone(&self) -> FpRegs

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FpRegs

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

Formats the value using the given formatter.

impl Default for FpRegs

fn default() -> Self

Returns the “default value” for a type.

impl Copy for FpRegs