int getClockFrame(int notme)
{
int frame;
// iterate through rpts (0x2400 - LC3_RPT_END)
int maxWrap = 20;
for (;maxWrap; cBigHand += 2, cLittleHand = 0) {
int i;
int rpte1;
int upta, upte1;
if (cBigHand >= LC3_RPT_END) {
DEBUG_STATEMENT(DEBUG_MMU,"\nClock is wrapping");
cBigHand = LC3_RPT;
maxWrap--;
}
rpte1 = memory[cBigHand];
if (DEFINED(rpte1) && REFERENCED(rpte1)) {
// clear reference
DEBUG_STATEMENT(DEBUG_MMU,"\nclearing ref for rpte");
memory[cBigHand] = rpte1 = CLEAR_REF(rpte1);
} else if (DEFINED(rpte1)) { // if one is non-referenced go to the user page table
// scout out the upt!! note that this has not been referenced
if (DEBUG_MMU) { outPTE("\nRPT entry being checked - ", cBigHand); }
upta = (FRAME(rpte1)<<6);
for (i = cLittleHand % 64; i < 64;i += 2, cLittleHand = i % 64) { // - iterate over userpage table
upte1 = memory[upta + (i)];
if (PINNED(upte1) || FRAME(upte1) == notme) {
DEBUG_STATEMENT(DEBUG_MMU,"\nupte1 frame was the notme frame (%x = %x) or pinned", FRAME(upte1), notme);
if (DEBUG_MMU) { outPTE("UPT entry being checked - ", upta + i); }
continue;
}
if (DEFINED(upte1) && REFERENCED(upte1)) { // - if entry is referenced un-reference and move on
// clear reference
DEBUG_STATEMENT(DEBUG_MMU,"\nclearing ref for upte %d", cLittleHand);
memory[cBigHand] = rpte1 = SET_PINNED(rpte1);
memory[upta + (i)] = upte1 = CLEAR_REF(upte1);
} else if (DEFINED(upte1)) { // - otherwise prep it for being put into swap
// we can use the frame referenced by upte1
if (DEBUG_MMU) { outPTE("UPT entry being checked - ", upta + 1); }
DEBUG_STATEMENT(DEBUG_MMU,"\nUpte1 %x, Upte2 %x", upte1, memory[upta + (i + 1)]);
memory[cBigHand] = rpte1 = SET_DIRTY(rpte1);
frame = FRAME(upte1);
swapOutFrame(upta + i);
cLittleHand += 2;
DEBUG_STATEMENT(DEBUG_MMU,"\nFound a data frame that can be used! (%d, %x)", frame, frame);
return frame;
}
}
cLittleHand = 0;
if (!REFERENCED(rpte1) && !PINNED(rpte1) && FRAME(rpte1) != notme) { // if we only replaced or did nothing to upte entries
// we can use the frame referenced by rpte1
frame = FRAME(rpte1);
DEBUG_STATEMENT(DEBUG_MMU,"\nFound a upt frame that can be used! (%d, %x)", frame, frame);
swapOutFrame(cBigHand);
cBigHand += 2;
return frame;
} else { // otherwise remove the pin flag
memory[cBigHand] = rpte1 = CLEAR_PINNED(rpte1);
}
}
} // when you get the bottom start at the top again
DEBUG_STATEMENT(DEBUG_MMU,"\n No valid frame found notme = %d", notme);
if (DEBUG_MMU) { displayTableHierarchy(); }
return -1;
}
int clockRunner(int notme)
{
//extern int curRPT;
//extern TCB tcb[MAX_TASKS];
int i,j,k;
int rpta, rpte1, rpte2;
int upta, upte1, upte2;
int victimFrame;
int tupta, tupte1;
//printf("\nClock running...%d\n",clockCount++);
//victimEntry = 0;
while (1)
{
//rpta = tcb[curRPT].RPT;
for (i = curRPTE; i < 0x3000; i+=2)
{
//rpte1 = memory[rpta + i];
//rpte2 = memory[rpta + i + 1];
rpte1 = memory[i];
rpte2 = memory[i + 1];
if (DEFINED(rpte1))
{
if (curUPTE == 0)
{
if(PINNED(rpte1))
{
//memory[rpta + i] = rpte1 = CLEAR_PINNED(rpte1);
memory[i] = rpte1 = CLEAR_PINNED(rpte1);
}
}
upta = (FRAME(rpte1)<<6);
for (j = curUPTE; j < 64; j+=2)
{
upte1 = memory[upta + j];
upte2 = memory[upta + j + 1];
if (DEFINED(upte1))
{
//memory[rpta + i] = rpte1 = SET_PINNED(rpte1);
memory[i] = rpte1 = SET_PINNED(rpte1);
if (REFERENCED(upte1))
{
memory[upta + j] = upte1 = CLEAR_REF(upte1);
}
else
{
//victimEntry = upte1;
// if end of UPT, reset upte and move to next UPT
//break; // because this is the victim
// instead of break, do swapping and return victim frame number
// immunity from notme
//if (FRAME(upte1) != notme)
//{
if (DIRTY(upte1))
{
int page;
//stat
pageWrites++;
if(PAGED(upte2))
{
page = accessPage(SWAPPAGE(upte2),FRAME(upte1),PAGE_OLD_WRITE);
}
else
{
page = accessPage(0,FRAME(upte1),PAGE_NEW_WRITE);
}
upte2 = page;
memory[upta + j + 1] = upte2 = SET_PAGED(upte2);
}
// save frame number before obliterating first word
victimFrame = FRAME(upte1);
//memory[upta + j] = upte1 = CLEAR_DEFINED(upte1);
memory[upta + j] = upte1 = 0;
curUPTE = (j + 2) % 64;
//printf("\nChose a UPT victim: %d\n",victimFrame);
return victimFrame;
//}
}
}
}
// immunity from notme
if ((FRAME(rpte1) != notme) && (!PINNED(rpte1)))
{
//victimEntry = rpte1;
// if end of RPT, reset rpte and move to next RPT
//break; // because this is the victim
// instead of break, do swapping and return victim frame number
//victimEntry = FRAME(rpte1);
// sanity check
tupta = (FRAME(rpte1)<<6);
for (k = 0; k < 64; k+=2)
{
tupte1 = memory[tupta + k];
if (DEFINED(tupte1))
printf("\nEvicting a UPT that has defined entries!!!\n");
}
//if (DIRTY(rpte1))
{
int page;
//stat
pageWrites++;
if(PAGED(rpte2))
{
page = accessPage(SWAPPAGE(rpte2),FRAME(rpte1),PAGE_OLD_WRITE);
}
else
{
page = accessPage(0,FRAME(rpte1),PAGE_NEW_WRITE);
}
rpte2 = page;
//memory[rpta + i + 1] = rpte2 = SET_PAGED(rpte2);
memory[i + 1] = rpte2 = SET_PAGED(rpte2);
}
// save frame number before obliterating first word
victimFrame = FRAME(rpte1);
//memory[rpta + i] = rpte1 = CLEAR_DEFINED(rpte1);
//memory[rpta + i] = rpte1 = 0;
memory[i] = rpte1 = 0;
//curRPTE = (i + 2) % 64;
//printf("\nChose a RPT victim: %d\n",victimFrame);
return victimFrame;
}
curUPTE = 0;
}
}
//curRPT = (curRPT + 1) % MAX_TASKS;
curRPTE = 0x2400;
}
}
int getFrame(int notme)
{
int UPTClock; // clock for UPT
int frame;
frame = getAvailableFrame();
if (frame >=0) return frame;
if(RPTClock == 0){
RPTClock = LC3_RPT;
}
int RPTBegin = RPTClock;
int first = 1;
int rptCount = 0;
//iterate the first time through the tables
while(first || RPTClock != RPTBegin){
rptCount++;
first = 0;
//Check and make sure the notme condition holds
if(DEFINED(memory[RPTClock])){
UPTClock = (FRAME(memory[RPTClock])<<6);
int UPTBegin = UPTClock;
int uFirst = 1;
int hadDefined = 0;
int uptcount = 0;
while(uFirst || UPTClock != UPTBegin){
uptcount++;
uFirst = 0;
if(DEFINED(memory[UPTClock])){
hadDefined = 1;
}
if(notme != UPTClock && DEFINED(memory[UPTClock])){
//swap out if not referenced
if(!REFERENCED(memory[UPTClock])){
//if it's dirty, write it to memory
int swapPage = 0;
if (DIRTY(memory[UPTClock])){
if(PAGED(memory[UPTClock + 1])) swapPage = accessPage(SWAPPAGE(memory[UPTClock + 1]), FRAME(memory[UPTClock]), PAGE_OLD_WRITE);
else swapPage = accessPage(0, FRAME(memory[UPTClock]), PAGE_NEW_WRITE);
memory[UPTClock] = CLEAR_DIRTY(memory[UPTClock]);
memory[UPTClock+1] = SET_PAGED(swapPage);
pageWrites++;
}
//no longer in main memory--it's swapped!
memory[UPTClock] = CLEAR_DEFINED(memory[UPTClock]);
//increment the clock
if(RPTClock + 2 < LC3_RPT_END)
RPTClock += 2;
else
RPTClock = LC3_RPT;
return FRAME(memory[UPTClock]);
}
memory[UPTClock] = CLEAR_REF(memory[UPTClock]);
}
//sanity check
assert(UPTClock >= 0x3000);
if(UPTClock + 2 < UPTBegin + LC3_FRAME_SIZE)
UPTClock += 2;
else
UPTClock = UPTBegin;
}
if(!REFERENCED(memory[RPTClock]) && !hadDefined && notme != RPTClock){
int swapPage;
if(PAGED(memory[RPTClock + 1])) swapPage = accessPage(SWAPPAGE(memory[RPTClock + 1]), FRAME(memory[RPTClock]), PAGE_OLD_WRITE);
else swapPage = accessPage(0, FRAME(memory[RPTClock]), PAGE_NEW_WRITE);
memory[RPTClock] = CLEAR_DIRTY(memory[RPTClock]);
memory[RPTClock+1] = SET_PAGED(swapPage);
pageWrites++;
memory[RPTClock] = CLEAR_DEFINED(memory[RPTClock]);
int rE1 = memory[RPTClock];
if(RPTClock + 2 < LC3_RPT_END)
RPTClock += 2;
else
RPTClock = LC3_RPT;
return FRAME(rE1);
}
//clear the reference bit
memory[RPTClock] = CLEAR_REF(memory[RPTClock]);
}
if(RPTClock + 2 < LC3_RPT_END){
RPTClock += 2;
}
else{
RPTClock = LC3_RPT;
}
}
RPTBegin = RPTClock;
first = 1;
while(first || RPTClock != RPTBegin){
rptCount++;
first = 0;
//Check and make sure the notme condition holds
if(DEFINED(memory[RPTClock])){
UPTClock = (FRAME(memory[RPTClock])<<6);
int UPTBegin = UPTClock;
int uFirst = 1;
int hadDefined = 0;
int uptcount = 0;
while(uFirst || UPTClock != UPTBegin){
uptcount++;
uFirst = 0;
if(DEFINED(memory[UPTClock])){
hadDefined = 1;
}
if(notme != UPTClock && DEFINED(memory[UPTClock])){
//swap out if not referenced
if(!REFERENCED(memory[UPTClock])){
//if it's dirty, write it to memory
int swapPage = 0;
if (DIRTY(memory[UPTClock])){
if(PAGED(memory[UPTClock + 1])) swapPage = accessPage(SWAPPAGE(memory[UPTClock + 1]), FRAME(memory[UPTClock]), PAGE_OLD_WRITE);
else swapPage = accessPage(0, FRAME(memory[UPTClock]), PAGE_NEW_WRITE);
memory[UPTClock] = CLEAR_DIRTY(memory[UPTClock]);
memory[UPTClock+1] = SET_PAGED(swapPage);
pageWrites++;
}
//no longer in main memory--it's swapped!
memory[UPTClock] = CLEAR_DEFINED(memory[UPTClock]);
//increment the clock
if(RPTClock + 2 < LC3_RPT_END)
RPTClock += 2;
else
RPTClock = LC3_RPT;
return FRAME(memory[UPTClock]);
}
memory[UPTClock] = CLEAR_REF(memory[UPTClock]);
}
//sanity check
assert(UPTClock >= 0x3000);
if(UPTClock + 2 < UPTBegin + LC3_FRAME_SIZE)
UPTClock += 2;
else
UPTClock = UPTBegin;
}
if(!REFERENCED(memory[RPTClock]) && !hadDefined && notme != RPTClock){
int swapPage;
if(PAGED(memory[RPTClock + 1])) swapPage = accessPage(SWAPPAGE(memory[RPTClock + 1]), FRAME(memory[RPTClock]), PAGE_OLD_WRITE);
else swapPage = accessPage(0, FRAME(memory[RPTClock]), PAGE_NEW_WRITE);
memory[RPTClock] = CLEAR_DIRTY(memory[RPTClock]);
memory[RPTClock+1] = SET_PAGED(swapPage);
pageWrites++;
memory[RPTClock] = CLEAR_DEFINED(memory[RPTClock]);
int rE1 = memory[RPTClock];
if(RPTClock + 2 < LC3_RPT_END)
RPTClock += 2;
else
RPTClock = LC3_RPT;
return FRAME(rE1);
}
//clear the reference bit
memory[RPTClock] = CLEAR_REF(memory[RPTClock]);
}
if(RPTClock + 2 < LC3_RPT_END){
RPTClock += 2;
}
else{
RPTClock = LC3_RPT;
}
}
//we should never ever be here
assert(0);
return -1;
}
int getFrame(int notme)
{
int frame;
frame = getAvailableFrame();
if (frame >=0) return frame;
// run clock
int i, j, upta, frameToRemove;
i = lastRpte;
// i = 0x2400;
// j = lastUpte;
while(1){
// for(i=0x2400;i<0x3000;i+=2){
// printf("%x", i);
if(DEFINED(memory[i])){
upta = FRAME(memory[i]);
upta = (upta<<6);
//double confirm
int k;
bool nothingInFrame = 1;
for(k=upta;k<upta+64;k+=2){
if(DEFINED(memory[k])){
nothingInFrame = 0;
break;
}
}
if(nothingInFrame && FRAME(memory[i])!=notme){
frameToRemove = FRAME(memory[i]);
lastRpte=i+2;
memory[i] = CLEAR_DEFINED(memory[i]);
memory[i] = CLEAR_REF(memory[i]);
if(PAGED(memory[i+1]) && DIRTY(memory[i])){
memory[i+1] = accessPage(SWAPPAGE(memory[i+1]), frameToRemove, PAGE_OLD_WRITE);
}else{
memory[i+1] = accessPage(0, frameToRemove, PAGE_NEW_WRITE);
}
memory[i+1] = SET_PAGED(memory[i+1]);
memory[i] = SET_DIRTY(memory[i]);
//possibly clear frame number
return frameToRemove;
// i can swap out this upt
}
// for(j=upta;j<upta+64;j+=2){
while(uptOffset < 64){
j = upta + uptOffset;
if(DEFINED(memory[j])){
if(REFERENCED(memory[j])){
memory[j] = CLEAR_REF(memory[j]);
}else{
//use this data frame
frameToRemove = FRAME(memory[j]);
lastRpte = i;
memory[j] = CLEAR_DEFINED(memory[j]);
memory[j] = CLEAR_REF(memory[j]);
// memory[j] = SWAPPAGE(memory[j]);
if(PAGED(memory[j+1]) && DIRTY(memory[j])){
memory[j+1] = accessPage(SWAPPAGE(memory[j+1]), frameToRemove, PAGE_OLD_WRITE);
}else{
memory[j+1] = accessPage(0, frameToRemove, PAGE_NEW_WRITE);
}
memory[j+1] = SET_PAGED(memory[j+1]);
uptOffset+=2; // may not need this line
//need to loop through rest next time but if nothing dont remove this one
return frameToRemove;
}
}
uptOffset+=2;
}
uptOffset = 0;
// }
}
i+=2;
if(i==0x3000){
i=0x2400;
}
// }
}
// memory[(frameToRemove<<6)]
return frame;
}
