Struct faucon_emu::memory::TlbEntry

pub struct TlbEntry {
    pub virtual_page_number: u16,
    pub flags: u8,
}

An entry in the Tlb that represents a physical code page.

Fields

virtual_page_number: u16

The virtual page number corresponding to a physical page.

flags: u8

The status flag bits for a physical page.

Implementations

impl TlbEntry

pub fn new() -> Self

Creates a new entry for the TLB, marked as completely free and unmapped.

pub fn map(&mut self, address: u32, _secret: bool)

Maps the physical page corresponding to the TLB entry to the virtual page space the given address belongs to.

NOTE: This sets PageFlag::Busy. It is within the caller’s responsibility to change this after code has been uploaded.

pub fn set_flag(&mut self, flag: PageFlag, set: bool)

Toggles a flag in the page settings based on the value of set.

• set = true sets the given flag
• set = false clears the given flag

pub fn get_flag(&self, flag: PageFlag) -> bool

Gets a flag from the page settings and indicates whether it is set.

pub fn is_valid(&self) -> bool

Checks if the entry is considered valid.

pub fn is_free(&self) -> bool

Indicates whether the physical page corresponding to the TLB entry is currently unmapped.

pub fn clear(&mut self)

Clears the TLB entry and frees it for remapping.

NOTE: Pages containing secret code cannot be cleared. The page has to be re-uploaded with non-secret data first.

Trait Implementations

impl Clone for TlbEntry

fn clone(&self) -> TlbEntry

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for TlbEntry

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

Formats the value using the given formatter.

impl Copy for TlbEntry