Enum x86_64::PrivilegeLevel

#[repr(u8)]
pub enum PrivilegeLevel {
    Ring0,
    Ring1,
    Ring2,
    Ring3,
}

Represents a protection ring level.

Variants

Ring0

Privilege-level 0 (most privilege): This level is used by critical system-software components that require direct access to, and control over, all processor and system resources. This can include BIOS, memory-management functions, and interrupt handlers.

Ring1

Privilege-level 1 (moderate privilege): This level is used by less-critical system- software services that can access and control a limited scope of processor and system resources. Software running at these privilege levels might include some device drivers and library routines. The actual privileges of this level are defined by the operating system.

Ring2

Privilege-level 2 (moderate privilege): Like level 1, this level is used by less-critical system-software services that can access and control a limited scope of processor and system resources. The actual privileges of this level are defined by the operating system.

Ring3

Privilege-level 3 (least privilege): This level is used by application software. Software running at privilege-level 3 is normally prevented from directly accessing most processor and system resources. Instead, applications request access to the protected processor and system resources by calling more-privileged service routines to perform the accesses.

Methods

impl PrivilegeLevel

pub fn from_u16(value: u16) -> PrivilegeLevel

Creates a PrivilegeLevel from a numeric value. The value must be in the range 0..4.

This function panics if the passed value is >3.

Trait Implementations

impl Debug for PrivilegeLevel

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

Formats the value using the given formatter.

impl Copy for PrivilegeLevel

impl Clone for PrivilegeLevel

fn clone(&self) -> PrivilegeLevel

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq for PrivilegeLevel

fn eq(&self, other: &PrivilegeLevel) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Eq for PrivilegeLevel