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;
}
