impl translation table + debut impl mmu
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@ -36,6 +36,8 @@ pub const NUM_FP_REGS: usize = 32;
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/// doit disparaitre
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const MEM_SIZE : usize = 0x500000;
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//doit etre une puissance de deux
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pub const PAGE_SIZE : u64 = 128;
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pub trait RegisterNum: Add<Output=Self> + Sub<Output=Self> + PartialEq + Copy {}
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@ -0,0 +1,50 @@
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use crate::simulator::translationtable::*;
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use crate::simulator::machine::*;
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use super::machine::ExceptionType;
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pub struct MMU <'a>{
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/* Un MMU possède une seule référence vers une table des pages à un instant donné
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* Cette table est associée au processus courant
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* Cette référence peut etre mise a jour par exemple lors d'un switchTo
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*/
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translationTable : Option<&'a mut TranslationTable>
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}
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impl <'a>MMU <'_>{
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fn create() -> MMU <'a>{
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MMU{
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translationTable : None
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}
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}
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fn translate(mmu : &mut MMU, virtAddr : u64, physAddr : &mut u64, size : usize, writing : bool) -> ExceptionType {
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let virtual_page_index : u64 = virtAddr/PAGE_SIZE;
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let offset : u64 = virtAddr%PAGE_SIZE;
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match &mmu.translationTable {
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None => {
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println!("Error from translate : MMU refers to None (No page Table)");
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return ExceptionType::ADDRESSERROR_EXCEPTION;
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}
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Some(table_ref) => {
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//On verifie que notre index est valide
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if virtual_page_index >= table_ref.get_max_num_pages(){
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}
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//is the page correctyl mapped ?
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//if table_ref.pageTable.get
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}
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}
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ExceptionType::NO_EXCEPTION
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}
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}
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@ -4,6 +4,8 @@ pub mod print;
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pub mod mem_cmp;
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pub mod loader;
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pub mod interrupt;
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pub mod translationtable;
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pub mod mmu;
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pub mod global {
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@ -4,26 +4,141 @@ const MaxVirtPages : u64 = 200000;
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/* Une table de correspondance propre à un processus
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* Une variable de type TranslationTable devra etre possédée par un objet de type Process
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*/
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struct TranslationTable{
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pub struct TranslationTable{
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//capacité de cette table <=> nombre de correspondances possibles
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maxNumPages : u64,
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//A voir si cette donnée doit etre immuable
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pub maxNumPages : u64,
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//la table en question
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//Vec implemente le trait Index, donc un bon choix
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pageTable : Vec<PageTableEntry>
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pub pageTable : Vec<PageTableEntry>
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}
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impl TranslationTable {
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fn create() -> TranslationTable {
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pub fn create() -> TranslationTable {
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let mut tmp_vec : Vec<PageTableEntry> = Vec::new();
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for i in 0..MaxVirtPages {
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tmp_vec.push(PageTableEntry::create());
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}
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TranslationTable{
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maxNumPages : MaxVirtPages,
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page
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pageTable : tmp_vec
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}
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}
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//vpn = virtual page number, c'est un index dans la table des page
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//Assert a mettre dans chacune des fonctions suivantes
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pub fn get_max_num_pages(&self) -> u64{
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return self.maxNumPages;
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}
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pub fn set_physical_page(&mut self, vpn : u64, physical_page : i32){
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self.pageTable[vpn as usize].physical_page = physical_page;
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}
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pub fn get_physical_page(&self, vpn : u64) -> i32{
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self.pageTable[vpn as usize].physical_page
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}
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pub fn set_addr_disk(&mut self, vpn : u64, addr_disk : i32){
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self.pageTable[vpn as usize].addr_disk = addr_disk;
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}
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pub fn get_addr_disk(&self, vpn : u64) -> i32 {
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self.pageTable[vpn as usize].addr_disk
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}
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pub fn set_bit_valid(&mut self, vpn : u64){
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self.pageTable[vpn as usize].valid = true;
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}
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pub fn clear_bit_valid(&mut self, vpn : u64){
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self.pageTable[vpn as usize].valid = false;
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}
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pub fn get_bit_valid(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].valid
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}
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pub fn set_bit_io(&mut self, vpn : u64){
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self.pageTable[vpn as usize].io = true;
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}
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pub fn clear_bit_io(&mut self, vpn : u64){
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self.pageTable[vpn as usize].io = false;
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}
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pub fn get_bit_io(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].io
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}
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pub fn set_bit_swap(&mut self, vpn : u64){
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self.pageTable[vpn as usize].swap = true;
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}
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pub fn clear_bit_swap(&mut self, vpn : u64){
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self.pageTable[vpn as usize].swap = false;
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}
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pub fn get_bit_swap(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].swap
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}
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pub fn set_bit_write(&mut self, vpn : u64){
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self.pageTable[vpn as usize].write_allowed = true;
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}
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pub fn clear_bit_write(&mut self, vpn : u64){
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self.pageTable[vpn as usize].write_allowed = false;
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}
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pub fn get_bit_write(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].write_allowed
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}
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pub fn set_bit_read(&mut self, vpn : u64){
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self.pageTable[vpn as usize].read_allowed = true;
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}
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pub fn clear_bit_read(&mut self, vpn : u64){
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self.pageTable[vpn as usize].read_allowed = false;
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}
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pub fn get_bit_read(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].read_allowed
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}
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pub fn set_bit_U(&mut self, vpn : u64){
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self.pageTable[vpn as usize].U = true;
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}
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pub fn clear_bit_U(&mut self, vpn : u64){
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self.pageTable[vpn as usize].U = false;
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}
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pub fn get_bit_U(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].U
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}
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pub fn set_bit_M(&mut self, vpn : u64){
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self.pageTable[vpn as usize].M = true;
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}
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pub fn clear_bit_M(&mut self, vpn : u64){
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self.pageTable[vpn as usize].M = false;
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}
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pub fn get_bit_M(&self, vpn : u64) -> bool{
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self.pageTable[vpn as usize].M
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}
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}
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@ -31,7 +146,7 @@ impl TranslationTable {
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/* Une correspondance + données sur cette correspondance
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*/
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struct PageTableEntry{
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pub struct PageTableEntry{
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//true <=> la correspondance est valide et la page est présente dans la ram
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valid : bool,
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@ -42,17 +157,17 @@ struct PageTableEntry{
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M : bool,
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//droits d'accès sur cette page
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readAllowed : bool,
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writeAllowed : bool,
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read_allowed : bool,
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write_allowed : bool,
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//numero de page physique <=> c'est notre correspondance
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physicalPage : i32,
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physical_page : i32,
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//true <=> cette page doit etre chargée depuis la swap zone du disque
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swap : bool,
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//a définir plus tard, en relation avec swap
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addrDisk : i32,
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addr_disk : i32,
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//mis à 1 par le système quand cette page est impliquée dans une opération d'IO
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io : bool
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@ -61,16 +176,16 @@ struct PageTableEntry{
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impl PageTableEntry{
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//Default PageTableEntry Constructor
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fn create() -> PageTableEntry {
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pub fn create() -> PageTableEntry {
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PageTableEntry {
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valid : false,
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U : false,
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M : false,
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readAllowed : false,
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writeAllowed : false,
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physicalPage : -1i32,
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read_allowed : false,
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write_allowed : false,
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physical_page : -1i32,
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swap : false,
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addrDisk : -1i32,
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addr_disk : -1i32,
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io : false
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}
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}
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