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task1 for shits and giggles

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Rushil Umaretiya 2024-04-10 19:24:27 -04:00
parent 719bb0e4df
commit 25e9b0edf8
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1 changed files with 24 additions and 3 deletions
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27
cache.c
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@ -42,8 +42,6 @@ int initialize_cache(unsigned int number_of_lines) {
}
int cread(unsigned int cmf, unsigned int* hex_addr, bool* hit, bool* replace) {
// TODO:
// Either the value at the requested hexadecimal address or FAIL
int ret_val = FAIL;
@ -52,6 +50,15 @@ int cread(unsigned int cmf, unsigned int* hex_addr, bool* hit, bool* replace) {
// hex_addr
unsigned int line, tag, block_offset;
if (cmf == DM) {
line = bit_select(*hex_addr, addr_bits - NUM_LINE_BITS, addr_bits - 1);
} else {
line = 0;
}
tag = bit_select(*hex_addr, 0, addr_bits - NUM_LINE_BITS - 1);
block_offset = bit_select(*hex_addr, 0, NUM_BLOCK_OFFSET_BITS - 1);
// (Optional) Indicates a line that is open and thus usable
int open_line;
// (Optional) For DM, indicates the cache line that should be replaced
@ -69,7 +76,21 @@ int cread(unsigned int cmf, unsigned int* hex_addr, bool* hit, bool* replace) {
*replace = false;
if ((cmf == DM) && ((*hex_addr) < exp2(addr_bits))) {
// TODO: Part 1
if (cache[line]->tag == tag) {
// hit
*hit = true;
cache[line]->hit_count++;
ret_val = cache[line]->block[block_offset];
} else {
// miss
*replace = true;
cache[line]->tag = tag;
cache[line]->hit_count = 1;
cache[line]->block[block_offset] =
phy_memory[block_location[*hex_addr]];
ret_val = cache[line]->block[block_offset];
}
} else if ((cmf == FA) && ((*hex_addr) < exp2(addr_bits))) {
// TODO: Part 2
}