OTHER CHEGG ANSWER DOES NOT WORK IT CRASHES EVERYTIME I TRY TO BUILD THE MEMORY. DO NOT POST THAT AS A REPLY IT IS USELESS

Computer Organization: Cache Memory Simulator:

Objective: To simulate reading and writing to a custom-sized direct-mapped cache, involving a custom-sized main memory. Inputs: The total size of accessible main memory (in words) The total size of the cache (in words) The block size (words/block) A signal to read (r) or write (w) to the cache The main memory address to read from/write to The contents of the address for writing to the cache Outputs: The corresponding cache tag, block, and word for a main memory address The contents of the address resulting from reading/writing to the cache A message indicating either a hit or a miss to the cache Specification: The program simulates reading from and writing to a cache based on choosing from a menu of choices, where each choice calls the appropriate procedure, where the choices are: a) Enter parameters b) Access cache for reading/writing and transfer data c) Quit program Notes: Use a structure (struct) to represent a cache line consisting of a tag (integer) and a block (integer pointer). Define the cache to be a pointer to the struct. Upon entering the parameters, the main memory and cache are to be dynamically allocated based on their respective total sizes. Each word i of main memory is initialized with the value Mi, where M is the size of main memory in words. For example, if the memory size is 16384, then word 10 will initially contain the value 16374 (which is 16384-10). Reading/writing from/to a new block in the cache results in dynamically allocating the block based on the block size.

This is my code so far:

#include #include

//declare cache

struct node{ int tag; int *block; //dynamic array } *cache= NULL;

typedef struct node line; //rename

//define dynamic array for Main Memory

int *mm= NULL;

//Declare Global Vars int numLines, blockSize, cacheSize, mmSize;

void Enter_Params(){ //local vars

int index =0; mmSize=0;

printf(" Enter main memory size (words): "); scanf("%d",&mmSize);

printf("Enter cache size (words): "); scanf ("%d",&cacheSize);

printf("Enter block size (words/block): "); scanf("%d",&blockSize);

//build Main Memory

mm=(int*)malloc(mmSize * sizeof(int));

for(index=0;index

mm[index]=mmSize-index; }

numLines= (cacheSize/blockSize); //Allocate memory for Cache

cache=(line*)malloc(numLines * sizeof(line));

for (index=0;index

cache[index].tag=-1; cache[index].block=NULL; } return; }

void Access_Cache(){ int index, data, mmAddress, tag, block, word, base; char signal;

printf("Select read (r) or write (w): "); scanf(" %c", &signal);

if(signal=='w'){ printf(" Enter main memory address to write to: "); scanf("%d",&mmAddress); printf(" Enter value to write to: "); scanf("%d", &data); } else if (signal=='r'){ printf(" Enter main memory address to read from: "); scanf("%d", &mmAddress); } tag=mmAddress/cacheSize; block=(mmAddress%cacheSize)/blockSize; word=mmAddress%blockSize; base =(mmAddress/blockSize)*blockSize;

//CASES

//Case 1: Miss if(cache[block].tag==-1){ cache[block].block=(int*)malloc(blockSize*sizeof(int));

}

//Case 2: Tags don't match

if(cache[block].tag!=tag){ if(signal=='w'){ printf("Write Miss!"); } else if(signal=='r'){ printf("Read Miss!"); } for(index=0;index

}

//Case 3: Hit due to matching tags

else if(cache[block].tag==tag){

if(signal=='w'){ printf("Write Hit!"); cache[block].block[word]=data; mm[mmAddress]=data; } else if(signal=='r'){ printf("Read Hit!"); data=cache[block].block[word]; } } printf(" ------------------------------------");

printf(" | Tag: %d\t\tBlock: %d\t\tWord: %d (%d)", tag, block, word, data);

printf("------------------------------------");

return; }

int main() { char choice='z';

printf("Cache memory allocation and mapping: "); printf(" ------------------------------------");

while(choice!='c'){

printf(" a) Enter parameters"); printf(" b) Access cache for reading/writing and transfer data"); printf(" c) Quit "); scanf(" %c", &choice);

switch(choice){ case 'a': Enter_Params(); break;

case 'b': Access_Cache(); break;

case 'c': printf("Exiting Program");exit(0); break;

default: printf("incorrect choice!");

}

} return 0; }

I AM MAINLY HAVING PROBLEMS BUILDING THE DYNAMIC ARRAY. FOR EXAMPLE, IF YOU INPUT THE FOLLOWING IT WILL CRASH EVERYTIME:

a

65536

1024

16

Please help I cannot figure this out