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100 lines
2.8 KiB
C
100 lines
2.8 KiB
C
// PID: 9DigitPidNoSpacesOrDashes
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// I pledge the COMP 211 honor code.
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "bit_utils.h"
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#include "cache.h"
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#include "memory.h"
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/**
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* Global variables. The extern ones are initialized in memory.c and are
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* accessible via the extern keyword
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*/
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extern unsigned int* phy_memory;
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extern unsigned int* block_location;
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extern unsigned int addr_bits;
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cache_line** cache;
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int initialize_cache(unsigned int number_of_lines) {
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unsigned int line;
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// Allocate memory for the cache (array of cache lines).
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cache = malloc(sizeof(cache_line*) * number_of_lines);
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// For each cache line, allocate memory and initialize the cache line.
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if (cache != NULL) {
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for (line = 0; line < number_of_lines; line++) {
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cache[line] = (cache_line*)malloc(sizeof(cache_line));
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cache[line]->tag = EMPTY;
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cache[line]->hit_count = 0;
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cache[line]->block =
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malloc(sizeof(unsigned int) * (int)exp2(NUM_BLOCK_OFFSET_BITS));
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}
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} else {
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return FAIL;
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}
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return OK;
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}
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int cread(unsigned int cmf, unsigned int* hex_addr, bool* hit, bool* replace) {
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// TODO:
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// Either the value at the requested hexadecimal address or FAIL
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int ret_val = FAIL;
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// Initialize these variables by
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// extracting the line (for DM, not FA), tag, and block offset bits from
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// hex_addr
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unsigned int line, tag, block_offset;
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// (Optional) Indicates a line that is open and thus usable
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int open_line;
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// (Optional) For DM, indicates the cache line that should be replaced
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int replace_line;
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// For FA, keeps track of LFU cache line
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int min_hit_cnt = (int)1E10;
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// For FA, keeps track of index of LFU cache line
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int min_line;
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// Variables that are passed by reference
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// Must indicate to the driver code whether there was a cache hit and
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// whether we had to overwrite and replace something
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*hit = false;
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*replace = false;
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if ((cmf == DM) && ((*hex_addr) < exp2(addr_bits))) {
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// TODO: Part 1
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} else if ((cmf == FA) && ((*hex_addr) < exp2(addr_bits))) {
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// TODO: Part 2
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}
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// Print state of cache after mapping algorithm is applied
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cprint();
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return ret_val;
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}
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void cprint() {
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unsigned int line;
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printf("\n---------------------------------------------\n");
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printf("line\ttag\tnum of hits\n");
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printf("---------------------------------------------\n");
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for (line = 0; line < NUM_LINES; line++) {
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if (cache[line]->tag == EMPTY) {
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printf("%d\t%d\t%d\n", line, cache[line]->tag,
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cache[line]->hit_count);
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} else {
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printf("%d\t%02X\t%d\n", line, cache[line]->tag,
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cache[line]->hit_count);
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}
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}
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}
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