1931 lines
77 KiB
Plaintext
1931 lines
77 KiB
Plaintext
#include <stdio.h>
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#include "common.h"
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// debug=1:输出额外调试信息
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int debug = 0;
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#define MAX_AGE 3
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// 组相联Data Cache
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// 容量为16384字节，4路组相联，每行容纳16个字节
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#define DCACHE_SIZE 16384
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#define DCACHE_LINES_PER_SET 4
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#define DCACHE_BYTES_PER_LINE 16 // 必须是8字节的倍数
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// 下面参数是自动计算的，你无须需改
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#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
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#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
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#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
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// Cache行的结构，包括Valid、Age、Tag和Data。你所有的状态信息，只能记录在Cache行中！
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struct DCACHE_LineStruct
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{
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UINT8 Valid;
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UINT8 Age;
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UINT64 Tag;
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UINT8 Data[DCACHE_BYTES_PER_LINE];
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};
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struct DCACHE_SetStruct {
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struct DCACHE_LineStruct Line[4]; // 4路组相联Cache，每组有4行
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} DCache[DCACHE_SET];
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// DCache初始化代码，模拟器启动时，会调用此InitDataCache函数
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void InitDataCache()
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{
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// 遍历每个组
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for (int set_idx = 0; set_idx < DCACHE_SET; set_idx++) {
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struct DCACHE_SetStruct *set = &DCache[set_idx];
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// 遍历每组中的四个Cache行
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for (int line_idx = 0; line_idx < DCACHE_LINES_PER_SET; line_idx++) {
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set->Line[line_idx].Valid = 0; // 有效位置0
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set->Line[line_idx].Age = line_idx; // 年龄依次设置为0、1、2、3
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}
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}
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}
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// 在第Set组中，从4路中，找到需要替换的Cache行
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int GetReplaceLine(UINT32 Set)
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{
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struct DCACHE_SetStruct *set = &DCache[Set];
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int invalid_line = -1;
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int max_age = -1;
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int replace_line = 0;
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for (int i = 0; i < DCACHE_LINES_PER_SET; i++) {
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struct DCACHE_LineStruct *line = &set->Line[i];
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if (line->Valid == 0) {
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// 发现无效行，记录第一个找到的无效行
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if (invalid_line == -1) {
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invalid_line = i;
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}
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} else {
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// 更新最大年龄和对应的行号
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if (line->Age > max_age) {
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max_age = line->Age;
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replace_line = i;
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}
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}
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}
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// 优先返回无效行，否则返回年龄最大的有效行
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return (invalid_line != -1) ? invalid_line : replace_line;
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}
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// 更新Age，在第Set组中，将HitLine指定的Cache行的Age设置为0，其他行的Age要相应调整
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void UpdateAge(UINT32 Set, int HitLine)
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{
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struct DCACHE_SetStruct *set = &DCache[Set];
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UINT8 old_age = set->Line[HitLine].Age; // 保存命中行原来的年龄
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set->Line[HitLine].Age = 0; // 命中行年龄置0
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// 调整其他行的年龄
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for (int i = 0; i < DCACHE_LINES_PER_SET; i++) {
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if (i == HitLine) continue; // 跳过命中行
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if (set->Line[i].Age < old_age) {
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set->Line[i].Age += 1; // 原年龄小于命中行原年龄的加1
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}
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}
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}
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// Data Cache访问接口，Cache模拟器会调用此接口，来实现对你的Data Cache访问
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// Address: 访存字节地址
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// Operation: 操作：读操作（'L'）、写操作（'S'）、读-修改-写操作（'M'）
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// DataSize: 数据大小：1字节、2字节、4字节、8字节
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// StoreValue: 当执行写操作的时候，需要写入的数据
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// LoadResult: 当执行读操作的时候，从Cache读出的数据
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// 返回值：'M'表示Miss；'H'表示Hit
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UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
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UINT64 StoreValue, UINT64* LoadResult)
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{
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UINT32 Set;
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UINT8 Block;
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UINT64 Tag;
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UINT8 MissFlag = 'M';
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UINT64 ReadValue;
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int HitLine = 0;
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UINT64 HitLineAddress = 0;
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*LoadResult = 0;
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// Address被划分为 Tag + Set + Block
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// Set Cache的组索引（每组4行）
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Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
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Block = Address % DCACHE_BYTES_PER_LINE;
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Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) >> DCACHE_SET_ADDR_BITS; // 地址去掉DCACHE_SET、DCACHE_BYTES_PER_LINE，剩下的作为Tag。警告！不能将整个地址作为Tag！！
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// 1. 首先需要检查对应的DCache行，其Valid位是否有效？Tag是否与AddressTag相等？
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// 2. 如果Valid有效，且AddressTag相等，则意味着Cache访问“命中”
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// 3. 如果“命中”，需要进一步判断是要读（'L'）还是写（'S'）或者是修改（'M'）？
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MissFlag = 'M';
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for (int i = 0; i < DCACHE_LINES_PER_SET; i++)
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{
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if (DCache[Set].Line[i].Valid == 1 && DCache[Set].Line[i].Tag == Tag)
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{
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MissFlag = 'H';
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HitLine = i;
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HitLineAddress = ((DCache[Set].Line[HitLine].Tag << DCACHE_SET_ADDR_BITS) <<
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DCACHE_BYTES_PER_LINE_ADDR_BITS) | ((UINT64)Set <<
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DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
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break;
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}
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}
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if (MissFlag == 'H')
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{
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if (Operation == 'L') // 读操作。从DCache对应行中，读取数据，注意数据宽度与对齐要求
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{
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ReadValue = 0;
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switch (DataSize)
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{
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case 1: // 1个字节
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ReadValue = DCache[Set].Line[HitLine].Data[Block + 0];
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break;
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case 2: // 2个字节
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Block = Block & 0xFE; // 需对齐到2字节边界
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ReadValue = DCache[Set].Line[HitLine].Data[Block + 1];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
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break;
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case 4: // 4个字节
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Block = Block & 0xFC; // 需对齐到4字节边界
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ReadValue = DCache[Set].Line[HitLine].Data[Block + 3];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
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break;
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case 8: // 8个字节
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Block = Block & 0xF8; // 需对齐到8字节边界
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ReadValue = DCache[Set].Line[HitLine].Data[Block + 7];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 6];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 5];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 4];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 3];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
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ReadValue = ReadValue << 8;
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ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
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break;
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}
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*LoadResult = ReadValue;
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if (debug)
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printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX ReadValue=%016llX\n",
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__func__, Address, Operation, DataSize, StoreValue, ReadValue);
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}
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else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
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{
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if (debug)
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printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
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__func__, Address, Operation, DataSize, StoreValue);
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switch (DataSize)
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{
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case 1: // 1个字节
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DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
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break;
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case 2: // 2个字节
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Block = Block & 0xFE; // 需对齐到2字节边界
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DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
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break;
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case 4: // 4个字节
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Block = Block & 0xFC; // 需对齐到4字节边界
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DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
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break;
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case 8: // 8个字节
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Block = Block & 0xF8; // 需对齐到8字节边界
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DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 4] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 5] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 6] = StoreValue & 0xFF;
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StoreValue = StoreValue >> 8;
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DCache[Set].Line[HitLine].Data[Block + 7] = StoreValue & 0xFF;
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break;
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}
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// 写穿透：每次更新Cache行，都需要把数据同时写入Memory
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StoreCacheLineToMemory(HitLineAddress, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
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}
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UpdateAge(Set, HitLine);
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}
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else
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{
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if (debug)
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printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
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__func__, Address, Operation, DataSize, StoreValue);
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if (Operation == 'L') // 读操作
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{
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// 读操作不需要做事情，因为已经MISS了。Cache模拟器会直接从Memory中读取数据，而不需要DCache提供
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// 需要从Memory中读入新的行（真实情况下，这个LoadCacheLineFromMemory需要很长时间的）
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HitLine = GetReplaceLine(Set);
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LoadCacheLineFromMemory(Address, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
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DCache[Set].Line[HitLine].Valid = 1;
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DCache[Set].Line[HitLine].Tag = Tag;
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UpdateAge(Set, HitLine);
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}
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else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
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{
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// 写操作，需要将新的StoreValue写到Memory中
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// 由于存储器访问每次都是8个字节，所以首先需要把旧的8个字节读取回来，然后根据需要更新
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UINT64 AlignAddress = Address & 0xFFFFFFFFFFFFFFF8; // 地址必须对齐到8字节边界
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UINT8 Offset; // 在8字节中的第几个字节？
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UINT64 ReadData = (DataSize == 8) ? 0 : ReadMemory(AlignAddress);
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UINT64 WriteData = ReadData;
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switch (DataSize)
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{
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case 1: // 1个字节，要确定写入8个字节中的哪1个字节？
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Offset = Address & 0x07; // 0~7
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WriteData = (ReadData & ~(0xFF<<8*Offset)) | ((StoreValue &0xFF) << 8*Offset);
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break;
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case 2: // 2个字节，要确定写入8个字节中的哪2个字节？
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Offset = Address & 0x06; // 0、2、4、6
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WriteData = (ReadData & ~(0xFFFF<<8*Offset)) | ((StoreValue &0xFFFF) << 8*Offset);
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break;
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case 4: // 4个字节，要确定写入8个字节中的哪4个字节？
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Offset = Address & 0x04; // 0、4
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WriteData = (ReadData & ~(0xFFFFFFFF << 8*Offset)) | ((StoreValue &0xFFFFFFFF) << 8*Offset);
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break;
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case 8: // 8个字节
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WriteData = StoreValue;
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break;
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}
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WriteMemory(AlignAddress, WriteData);
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// 写非分配。所以对于MISS的写操作，不在Cache中分配行
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}
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}
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return MissFlag;
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}
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#ifdef ICACHE_ENABLE
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/* 指令Cache实现部分，可选实现 */
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void InitInstCache(void)
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{
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return;
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}
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UINT8 AccessInstCache(UINT64 Address, UINT8 Operation, UINT8 InstSize,
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UINT64* InstResult)
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{
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// ICache只有Operation = 'I'的操作，只会读。不会写
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// 返回值'M' = Miss，'H'=Hit
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return 'M';
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}
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#endif
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3
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#include <stdio.h>
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#include "common.h"
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// debug=1:输出额外调试信息
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int debug = 0;
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#define MAX_AGE 3
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// 组相联Data Cache
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// 容量为16384字节，4路组相联，每行容纳16个字节
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#define DCACHE_SIZE 16384
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#define DCACHE_LINES_PER_SET 4
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#define DCACHE_BYTES_PER_LINE 16 // 必须是8字节的倍数
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// 下面参数是自动计算的，你无须需改
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#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
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#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
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#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
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// Cache行的结构，包括Valid、Age、Dirty、Tag和Data。你所有的状态信息，只能记录在Cache行中！
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struct DCACHE_LineStruct
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{
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UINT8 Valid;
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UINT8 Age;
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UINT8 Dirty;
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UINT64 Tag;
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UINT8 Data[DCACHE_BYTES_PER_LINE];
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};
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struct DCACHE_SetStruct {
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struct DCACHE_LineStruct Line[4]; // 4路组相联Cache，每组有4行
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} DCache[DCACHE_SET];
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// DCache初始化代码，模拟器启动时，会调用此InitDataCache函数
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void InitDataCache()
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{
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// *********** 你需要在下面书写代码 ***********
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for (int i = 0; i < DCACHE_SET; i++)
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{
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for (int j = 0; j < 4; j++)
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{
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DCache[i].Line[j].Valid = 0;
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DCache[i].Line[j].Age = j;
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DCache[i].Line[j].Dirty = j;
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DCache[i].Line[j].Tag = 0;
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}
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}
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// *********** 你需要在上面书写代码 ***********
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}
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// 在第Set组中，从4路中，找到需要替换的Cache行
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// 如果4行中，有某行的Valid=0，则返回该行行号
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// 否则，返回Age最大的行的行号
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int GetReplaceLine(UINT32 Set)
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{
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// *********** 你需要在下面书写代码 ***********
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int replace_line = -1;
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UINT8 max_age = 0;
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for (int i = 0; i < 4; i++)
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{
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if (!DCache[Set].Line[i].Valid)
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{
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return i;
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}
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if (DCache[Set].Line[i].Age > max_age)
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{
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max_age = DCache[Set].Line[i].Age;
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replace_line = i;
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}
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}
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return replace_line;
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// *********** 你需要在上面书写代码 ***********
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}
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// 更新Age，在第Set组中，将HitLine指定的Cache行的Age设置为0，其他行的Age要相应调整
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// 注意！要确保4行的Age分别为0~3，且唯一
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void UpdateAge(UINT32 Set, int HitLine)
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{
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// *********** 你需要在下面书写代码 ***********
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UINT8 old_age = DCache[Set].Line[HitLine].Age;
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DCache[Set].Line[HitLine].Age = 0;
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for (int i = 0; i < 4; i++)
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{
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if (i != HitLine && DCache[Set].Line[i].Valid)
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{
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if (DCache[Set].Line[i].Age < old_age)
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{
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DCache[Set].Line[i].Age++;
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}
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}
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}
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// *********** 你需要在上面书写代码 ***********
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}
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// Data Cache访问接口，Cache模拟器会调用此接口，来实现对你的Data Cache访问
|
||
// Address: 访存字节地址
|
||
// Operation: 操作：读操作（'L'）、写操作（'S'）、读-修改-写操作（'M'）
|
||
// DataSize: 数据大小：1字节、2字节、4字节、8字节
|
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// StoreValue: 当执行写操作的时候，需要写入的数据
|
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// LoadResult: 当执行读操作的时候，从Cache读出的数据
|
||
// 返回值：'M'表示Miss；'H'表示Hit
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
UINT32 Set;
|
||
UINT8 Block;
|
||
UINT64 Tag;
|
||
UINT8 MissFlag = 'M';
|
||
UINT64 ReadValue;
|
||
int HitLine = 0;
|
||
UINT64 HitLineAddress = 0;
|
||
|
||
*LoadResult = 0;
|
||
|
||
|
||
// Address被划分为 Tag + Set + Block
|
||
|
||
// Set Cache的组索引（每组4行）
|
||
Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
Block = Address % DCACHE_BYTES_PER_LINE;
|
||
Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) >> DCACHE_SET_ADDR_BITS; // 地址去掉DCACHE_SET、DCACHE_BYTES_PER_LINE，剩下的作为Tag。警告！不能将整个地址作为Tag！！
|
||
|
||
// 1. 首先需要检查对应的DCache行，其Valid位是否有效？Tag是否与AddressTag相等？
|
||
// 2. 如果Valid有效，且AddressTag相等，则意味着Cache访问“命中”
|
||
// 3. 如果“命中”，需要进一步判断是要读（'L'）还是写（'S'）或者是修改（'M'）？
|
||
MissFlag = 'M';
|
||
for (int i = 0; i < DCACHE_LINES_PER_SET; i++)
|
||
{
|
||
if (DCache[Set].Line[i].Valid == 1 && DCache[Set].Line[i].Tag == Tag)
|
||
{
|
||
MissFlag = 'H';
|
||
HitLine = i;
|
||
HitLineAddress = ((DCache[Set].Line[HitLine].Tag << DCACHE_SET_ADDR_BITS) <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS) | ((UINT64)Set <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
break;
|
||
}
|
||
}
|
||
if (MissFlag == 'H')
|
||
{
|
||
UpdateAge(Set, HitLine);
|
||
if (Operation == 'L') // 读操作。从DCache对应行中，读取数据，注意数据宽度与对齐要求
|
||
{
|
||
ReadValue = 0;
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 7];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 6];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 5];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 4];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
}
|
||
*LoadResult = ReadValue;
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX ReadValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue, ReadValue);
|
||
}
|
||
else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
// 写穿透：每次更新Cache行，都需要把数据同时写入Memory
|
||
//StoreCacheLineToMemory(HitLineAddress, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[HitLine].Dirty = 1; //标记脏数据
|
||
}
|
||
UpdateAge(Set, HitLine);
|
||
}
|
||
else
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
if (Operation == 'L' || Operation == 'M' || Operation == 'S') // 读操作
|
||
{
|
||
// 需要从Memory中读入新的行（真实情况下，这个LoadCacheLineFromMemory需要很长时间的）
|
||
int ReLine = GetReplaceLine(Set);
|
||
UINT64 ReLineAddress = 0;
|
||
|
||
//写回：当被替换的数据为脏数据时，我们需要先将该行数据首先写入到Memory中，再执行替换
|
||
if(DCache[Set].Line[ReLine].Dirty == 1 && DCache[Set].Line[ReLine].Valid == 1)
|
||
{
|
||
ReLineAddress = (DCache[Set].Line[ReLine].Tag << (DCACHE_SET_ADDR_BITS + DCACHE_BYTES_PER_LINE_ADDR_BITS)) | ((UINT64)Set << DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
StoreCacheLineToMemory(ReLineAddress, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
//开始替换，加载新数据
|
||
LoadCacheLineFromMemory(Address, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[ReLine].Valid = 1;
|
||
DCache[Set].Line[ReLine].Tag = Tag;
|
||
DCache[Set].Line[ReLine].Dirty = 0;
|
||
UpdateAge(Set, ReLine);
|
||
|
||
if(Operation == 'M' || Operation == 'S')
|
||
{
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
DCache[Set].Line[ReLine].Dirty = 1;
|
||
}
|
||
UpdateAge(Set, ReLine);
|
||
}
|
||
}
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
|
||
/* 指令Cache实现部分，可选实现 */
|
||
void InitInstCache(void)
|
||
{
|
||
return;
|
||
}
|
||
|
||
UINT8 AccessInstCache(UINT64 Address, UINT8 Operation, UINT8 InstSize,
|
||
UINT64* InstResult)
|
||
{
|
||
// ICache只有Operation = 'I'的操作，只会读。不会写
|
||
// 返回值'M' = Miss，'H'=Hit
|
||
return 'M';
|
||
}
|
||
#endif
|
||
|
||
4
|
||
#include <stdio.h>
|
||
#include "common.h"
|
||
|
||
// debug=1:输出额外调试信息
|
||
int debug = 0;
|
||
|
||
// 组相联Data Cache
|
||
// 容量为16384字节，4路组相联，每行容纳16个字节
|
||
#define DCACHE_SIZE 16384
|
||
#define DCACHE_LINES_PER_SET 4
|
||
#define DCACHE_BYTES_PER_LINE 16 // 必须是8字节的倍数
|
||
|
||
// 下面参数是自动计算的，你无须需改
|
||
#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
|
||
#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
|
||
#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
|
||
|
||
// Cache行的结构，包括Valid、Age、Dirty、Tag和Data。你所有的状态信息，只能记录在Cache行中！
|
||
struct DCACHE_LineStruct
|
||
{
|
||
UINT8 Valid;
|
||
UINT8 Age;
|
||
UINT8 Dirty;
|
||
UINT64 Tag;
|
||
UINT8 Data[DCACHE_BYTES_PER_LINE];
|
||
};
|
||
|
||
struct DCACHE_SetStruct {
|
||
struct DCACHE_LineStruct Line[4]; // 4路组相联Cache，每组有4行
|
||
} DCache[DCACHE_SET];
|
||
|
||
|
||
// DCache初始化代码，模拟器启动时，会调用此InitDataCache函数
|
||
void InitDataCache()
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
for (int i = 0; i < DCACHE_SET; i++)
|
||
{
|
||
for (int j = 0; j < 4; j++)
|
||
{
|
||
DCache[i].Line[j].Valid = 0;
|
||
DCache[i].Line[j].Age = j;
|
||
DCache[i].Line[j].Dirty = j;
|
||
DCache[i].Line[j].Tag = 0;
|
||
}
|
||
}
|
||
// *********** 你需要在上面书写代码 ***********
|
||
}
|
||
|
||
// 在第Set组中，从4路中，找到需要替换的Cache行
|
||
// 如果4行中，有某行的Valid=0，则返回该行行号
|
||
// 否则，返回Age=0的行的行号
|
||
int GetReplaceLine(UINT32 Set)
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
int replace_line = -1;
|
||
|
||
for (int i = 0; i < 4; i++)
|
||
{
|
||
if (!DCache[Set].Line[i].Valid)
|
||
{
|
||
return i;
|
||
}
|
||
if (DCache[Set].Line[i].Age == 0)
|
||
{
|
||
replace_line = i;
|
||
}
|
||
}
|
||
return replace_line;
|
||
// *********** 你需要在上面书写代码 ***********
|
||
return -1;
|
||
}
|
||
|
||
// 更新Age，在第Set组中，将HitLine指定的Cache行的Age设置为0，其他行的Age要相应调整
|
||
// 注意！要确保4行的Age分别为0~3，且唯一
|
||
void UpdateAge(UINT32 Set, int HitLine)
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
UINT8 old_age = DCache[Set].Line[HitLine].Age;
|
||
DCache[Set].Line[HitLine].Age = 0;
|
||
|
||
for (int i = 0; i < 4; i++)
|
||
{
|
||
if (i != HitLine && DCache[Set].Line[i].Valid)
|
||
{
|
||
if (DCache[Set].Line[i].Age < old_age)
|
||
{
|
||
DCache[Set].Line[i].Age++;
|
||
}
|
||
}
|
||
}
|
||
// *********** 你需要在上面书写代码 ***********
|
||
}
|
||
|
||
// Data Cache访问接口，Cache模拟器会调用此接口，来实现对你的Data Cache访问
|
||
// Address: 访存字节地址
|
||
// Operation: 操作：读操作（'L'）、写操作（'S'）、读-修改-写操作（'M'）
|
||
// DataSize: 数据大小：1字节、2字节、4字节、8字节
|
||
// StoreValue: 当执行写操作的时候，需要写入的数据
|
||
// LoadResult: 当执行读操作的时候，从Cache读出的数据
|
||
// 返回值：'M'表示Miss；'H'表示Hit
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
UINT32 Set;
|
||
UINT8 Block;
|
||
UINT64 Tag;
|
||
UINT8 MissFlag = 'M';
|
||
UINT64 ReadValue;
|
||
int HitLine = 0;
|
||
UINT64 HitLineAddress = 0;
|
||
|
||
*LoadResult = 0;
|
||
|
||
|
||
// Address被划分为 Tag + Set + Block
|
||
|
||
// Set Cache的组索引（每组4行）
|
||
Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
Block = Address % DCACHE_BYTES_PER_LINE;
|
||
Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) >> DCACHE_SET_ADDR_BITS; // 地址去掉DCACHE_SET、DCACHE_BYTES_PER_LINE，剩下的作为Tag。警告！不能将整个地址作为Tag！！
|
||
|
||
// 1. 首先需要检查对应的DCache行，其Valid位是否有效？Tag是否与AddressTag相等？
|
||
// 2. 如果Valid有效，且AddressTag相等，则意味着Cache访问“命中”
|
||
// 3. 如果“命中”，需要进一步判断是要读（'L'）还是写（'S'）或者是修改（'M'）？
|
||
MissFlag = 'M';
|
||
for (int i = 0; i < DCACHE_LINES_PER_SET; i++)
|
||
{
|
||
if (DCache[Set].Line[i].Valid == 1 && DCache[Set].Line[i].Tag == Tag)
|
||
{
|
||
MissFlag = 'H';
|
||
HitLine = i;
|
||
HitLineAddress = ((DCache[Set].Line[HitLine].Tag << DCACHE_SET_ADDR_BITS) <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS) | ((UINT64)Set <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
break;
|
||
}
|
||
}
|
||
if (MissFlag == 'H')
|
||
{
|
||
UpdateAge(Set, HitLine);
|
||
if (Operation == 'L') // 读操作。从DCache对应行中，读取数据，注意数据宽度与对齐要求
|
||
{
|
||
ReadValue = 0;
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 7];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 6];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 5];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 4];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
}
|
||
*LoadResult = ReadValue;
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX ReadValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue, ReadValue);
|
||
}
|
||
else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
// 写穿透：每次更新Cache行，都需要把数据同时写入Memory
|
||
//StoreCacheLineToMemory(HitLineAddress, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[HitLine].Dirty = 1; //标记脏数据
|
||
}
|
||
UpdateAge(Set, HitLine);
|
||
}
|
||
else
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
if (Operation == 'L' || Operation == 'M' || Operation == 'S') // 读操作
|
||
{
|
||
// 需要从Memory中读入新的行（真实情况下，这个LoadCacheLineFromMemory需要很长时间的）
|
||
int ReLine = GetReplaceLine(Set);
|
||
UINT64 ReLineAddress = 0;
|
||
|
||
//写回：当被替换的数据为脏数据时，我们需要先将该行数据首先写入到Memory中，再执行替换
|
||
if(DCache[Set].Line[ReLine].Dirty == 1 && DCache[Set].Line[ReLine].Valid == 1)
|
||
{
|
||
ReLineAddress = (DCache[Set].Line[ReLine].Tag << (DCACHE_SET_ADDR_BITS + DCACHE_BYTES_PER_LINE_ADDR_BITS)) | ((UINT64)Set << DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
StoreCacheLineToMemory(ReLineAddress, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
//开始替换，加载新数据
|
||
LoadCacheLineFromMemory(Address, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[ReLine].Valid = 1;
|
||
DCache[Set].Line[ReLine].Tag = Tag;
|
||
DCache[Set].Line[ReLine].Dirty = 0;
|
||
UpdateAge(Set, ReLine);
|
||
|
||
if(Operation == 'M' || Operation == 'S')
|
||
{
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
DCache[Set].Line[ReLine].Dirty = 1;
|
||
}
|
||
UpdateAge(Set, ReLine);
|
||
}
|
||
}
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
|
||
/* 指令Cache实现部分，可选实现 */
|
||
void InitInstCache(void)
|
||
{
|
||
return;
|
||
}
|
||
|
||
UINT8 AccessInstCache(UINT64 Address, UINT8 Operation, UINT8 InstSize,
|
||
UINT64* InstResult)
|
||
{
|
||
// ICache只有Operation = 'I'的操作，只会读。不会写
|
||
// 返回值'M' = Miss，'H'=Hit
|
||
return 'M';
|
||
}
|
||
#endif
|
||
|
||
5
|
||
#include <stdio.h>
|
||
#include "common.h"
|
||
|
||
int debug = 0;
|
||
|
||
#define DCACHE_SIZE 16384
|
||
#define DCACHE_LINES_PER_SET 4
|
||
#define DCACHE_BYTES_PER_LINE 16
|
||
|
||
#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
|
||
#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
|
||
#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
|
||
|
||
struct DCACHE_LineStruct {
|
||
UINT8 Valid;
|
||
UINT8 Age;
|
||
UINT8 Dirty;
|
||
UINT64 Tag;
|
||
UINT8 Data[DCACHE_BYTES_PER_LINE];
|
||
};
|
||
|
||
struct DCACHE_SetStruct {
|
||
struct DCACHE_LineStruct Line[4];
|
||
} DCache[DCACHE_SET];
|
||
|
||
void InitDataCache() {
|
||
for (int s = 0; s < DCACHE_SET; s++)
|
||
{
|
||
for (int l = 0; l < 4; l++) {
|
||
DCache[s].Line[l].Valid = 0;
|
||
DCache[s].Line[l].Age = 0;
|
||
DCache[s].Line[l].Dirty = 0;
|
||
DCache[s].Line[l].Tag = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
int GetReplaceLine(UINT32 Set) {
|
||
// 查找无效行
|
||
for (int i = 0; i < 4; i++) {
|
||
if (!DCache[Set].Line[i].Valid) return i;
|
||
}
|
||
|
||
// 查找最大Age行
|
||
int max_age = 0, replace_line = 0;
|
||
for (int i = 0; i < 4; i++) {
|
||
if (DCache[Set].Line[i].Age > max_age) {
|
||
max_age = DCache[Set].Line[i].Age;
|
||
replace_line = i;
|
||
}
|
||
}
|
||
return replace_line;
|
||
}
|
||
|
||
void UpdateAge(UINT32 Set, int HitLine) {
|
||
DCache[Set].Line[HitLine].Age = 0;
|
||
for (int i = 0; i < 4; i++) {
|
||
if (i != HitLine && DCache[Set].Line[i].Valid) {
|
||
DCache[Set].Line[i].Age = (DCache[Set].Line[i].Age < 3) ?
|
||
DCache[Set].Line[i].Age + 1 : 3;
|
||
}
|
||
}
|
||
}
|
||
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
UINT32 Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
UINT8 Block = Address % DCACHE_BYTES_PER_LINE;
|
||
UINT64 Tag = Address >> (DCACHE_BYTES_PER_LINE_ADDR_BITS + DCACHE_SET_ADDR_BITS);
|
||
UINT8 MissFlag = 'M';
|
||
int HitLine = -1;
|
||
|
||
// 检查命中
|
||
for (int i = 0; i < 4; i++) {
|
||
if (DCache[Set].Line[i].Valid && DCache[Set].Line[i].Tag == Tag) {
|
||
HitLine = i;
|
||
MissFlag = 'H';
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (MissFlag == 'H') {
|
||
// 处理数据对齐
|
||
switch (DataSize) {
|
||
case 2: Block &= 0xFE; break;
|
||
case 4: Block &= 0xFC; break;
|
||
case 8: Block &= 0xF8; break;
|
||
}
|
||
|
||
if (Operation == 'L') {
|
||
*LoadResult = 0;
|
||
for (int i = DataSize-1; i >= 0; i--) {
|
||
*LoadResult = (*LoadResult << 8) | DCache[Set].Line[HitLine].Data[Block+i];
|
||
}
|
||
} else {
|
||
for (int i = 0; i < DataSize; i++) {
|
||
DCache[Set].Line[HitLine].Data[Block+i] = (StoreValue >> (i*8)) & 0xFF;
|
||
}
|
||
DCache[Set].Line[HitLine].Dirty = 1;
|
||
}
|
||
} else {
|
||
if (Operation == 'L' || Operation == 'S' || Operation == 'M') {
|
||
int ReplaceLine = GetReplaceLine(Set);
|
||
struct DCACHE_LineStruct *line = &DCache[Set].Line[ReplaceLine];
|
||
|
||
// 写回脏数据
|
||
if (line->Valid && line->Dirty) {
|
||
UINT64 old_addr = (line->Tag << (DCACHE_SET_ADDR_BITS + DCACHE_BYTES_PER_LINE_ADDR_BITS))
|
||
| (Set << DCACHE_BYTES_PER_LINE_ADDR_BITS);
|
||
StoreCacheLineToMemory(old_addr, line->Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
// 加载新行
|
||
LoadCacheLineFromMemory(Address, line->Data, DCACHE_BYTES_PER_LINE);
|
||
line->Valid = 1;
|
||
line->Tag = Tag;
|
||
line->Dirty = (Operation == 'L') ? 0 : 1;
|
||
|
||
// 更新Age状态
|
||
UpdateAge(Set, ReplaceLine);
|
||
|
||
// 处理数据对齐
|
||
switch (DataSize) {
|
||
case 2: Block &= 0xFE; break;
|
||
case 4: Block &= 0xFC; break;
|
||
case 8: Block &= 0xF8; break;
|
||
}
|
||
|
||
// 处理写操作
|
||
if (Operation != 'L') {
|
||
for (int i = 0; i < DataSize; i++) {
|
||
line->Data[Block+i] = (StoreValue >> (i*8)) & 0xFF;
|
||
}
|
||
line->Dirty = 1;
|
||
}
|
||
|
||
// 返回读数据
|
||
if (Operation == 'L') {
|
||
*LoadResult = 0;
|
||
for (int i = DataSize-1; i >= 0; i--) {
|
||
*LoadResult = (*LoadResult << 8) | line->Data[Block+i];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
void InitInstCache(void) { return; }
|
||
UINT8 AccessInstCache(UINT64 a, UINT8 b, UINT8 c, UINT64* d) { return 'M'; }
|
||
#endif
|
||
|
||
6
|
||
#include <stdio.h>
|
||
#include "common.h"
|
||
|
||
// debug=1:输出额外调试信息
|
||
int debug = 0;
|
||
|
||
// 组相联Data Cache
|
||
// 容量为16384字节，4路组相联，每行容纳16个字节
|
||
#define DCACHE_SIZE 16384
|
||
#define DCACHE_LINES_PER_SET 4
|
||
#define DCACHE_BYTES_PER_LINE 16 // 必须是8字节的倍数
|
||
|
||
// 下面参数是自动计算的，你无须需改
|
||
#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
|
||
#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
|
||
#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
|
||
|
||
// Cache行的结构，包括Valid、Age、Dirty、Tag和Data。你所有的状态信息，只能记录在Cache行中！
|
||
struct DCACHE_LineStruct
|
||
{
|
||
UINT8 Valid;
|
||
UINT8 NRU;
|
||
UINT8 Dirty;
|
||
UINT64 Tag;
|
||
UINT8 Data[DCACHE_BYTES_PER_LINE];
|
||
};
|
||
|
||
struct DCACHE_SetStruct {
|
||
struct DCACHE_LineStruct Line[4]; // 4路组相联Cache，每组有4行
|
||
} DCache[DCACHE_SET];
|
||
|
||
|
||
// DCache初始化代码，模拟器启动时，会调用此InitDataCache函数
|
||
void InitDataCache()
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
for (int i = 0; i < DCACHE_SET; i++)
|
||
{
|
||
for (int j = 0; j < 4; j++)
|
||
{
|
||
DCache[i].Line[j].Valid = 0;
|
||
DCache[i].Line[j].NRU = 1;
|
||
DCache[i].Line[j].Dirty = 0;
|
||
DCache[i].Line[j].Tag = 0;
|
||
}
|
||
}
|
||
// *********** 你需要在上面书写代码 ***********
|
||
}
|
||
|
||
// 在第Set组中，从4路中，找到需要替换的Cache行
|
||
// 如果4行中，有某行的Valid=0，则返回该行行号
|
||
// 否则，返回NRU位为1的行号
|
||
int GetReplaceLine(UINT32 Set)
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
int replace_line = -1;
|
||
|
||
for (int i = 0; i < 4; i++)
|
||
{
|
||
if (!DCache[Set].Line[i].Valid)
|
||
{
|
||
return i;
|
||
}
|
||
if (DCache[Set].Line[i].NRU == 1)
|
||
{
|
||
replace_line = i;
|
||
break;
|
||
}
|
||
}
|
||
|
||
//全部为0时，重置为0并返回首行
|
||
if(replace_line == -1)
|
||
{
|
||
for(int i = 0; i < 4; i++)
|
||
{
|
||
DCache[Set].Line[i].NRU = 1;
|
||
}
|
||
replace_line = 0;
|
||
}
|
||
return replace_line;
|
||
// *********** 你需要在上面书写代码 ***********
|
||
return -1;
|
||
}
|
||
|
||
|
||
// Data Cache访问接口，Cache模拟器会调用此接口，来实现对你的Data Cache访问
|
||
// Address: 访存字节地址
|
||
// Operation: 操作：读操作（'L'）、写操作（'S'）、读-修改-写操作（'M'）
|
||
// DataSize: 数据大小：1字节、2字节、4字节、8字节
|
||
// StoreValue: 当执行写操作的时候，需要写入的数据
|
||
// LoadResult: 当执行读操作的时候，从Cache读出的数据
|
||
// 返回值：'M'表示Miss；'H'表示Hit
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
UINT32 Set;
|
||
UINT8 Block;
|
||
UINT64 Tag;
|
||
UINT8 MissFlag = 'M';
|
||
UINT64 ReadValue;
|
||
int HitLine = 0;
|
||
UINT64 HitLineAddress = 0;
|
||
|
||
*LoadResult = 0;
|
||
|
||
|
||
// Address被划分为 Tag + Set + Block
|
||
|
||
// Set Cache的组索引（每组4行）
|
||
Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
Block = Address % DCACHE_BYTES_PER_LINE;
|
||
Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) >> DCACHE_SET_ADDR_BITS; // 地址去掉DCACHE_SET、DCACHE_BYTES_PER_LINE，剩下的作为Tag。警告！不能将整个地址作为Tag！！
|
||
|
||
// 1. 首先需要检查对应的DCache行，其Valid位是否有效？Tag是否与AddressTag相等？
|
||
// 2. 如果Valid有效，且AddressTag相等，则意味着Cache访问“命中”
|
||
// 3. 如果“命中”，需要进一步判断是要读（'L'）还是写（'S'）或者是修改（'M'）？
|
||
MissFlag = 'M';
|
||
for (int i = 0; i < DCACHE_LINES_PER_SET; i++)
|
||
{
|
||
if (DCache[Set].Line[i].Valid == 1 && DCache[Set].Line[i].Tag == Tag)
|
||
{
|
||
MissFlag = 'H';
|
||
HitLine = i;
|
||
HitLineAddress = ((DCache[Set].Line[HitLine].Tag << DCACHE_SET_ADDR_BITS) <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS) | ((UINT64)Set <<
|
||
DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
break;
|
||
}
|
||
}
|
||
if (MissFlag == 'H')
|
||
{
|
||
//UpdateAge(Set, HitLine);
|
||
DCache[Set].Line[HitLine].NRU = 0;
|
||
if (Operation == 'L') // 读操作。从DCache对应行中，读取数据，注意数据宽度与对齐要求
|
||
{
|
||
ReadValue = 0;
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
ReadValue = DCache[Set].Line[HitLine].Data[Block + 7];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 6];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 5];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 4];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache[Set].Line[HitLine].Data[Block + 0];
|
||
break;
|
||
}
|
||
*LoadResult = ReadValue;
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX ReadValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue, ReadValue);
|
||
}
|
||
else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[HitLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
// 写穿透：每次更新Cache行，都需要把数据同时写入Memory
|
||
//StoreCacheLineToMemory(HitLineAddress, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[HitLine].Dirty = 1; //标记脏数据
|
||
}
|
||
//UpdateAge(Set, HitLine);
|
||
}
|
||
else
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
if (Operation == 'L' || Operation == 'M' || Operation == 'S') // 读操作
|
||
{
|
||
// 需要从Memory中读入新的行（真实情况下，这个LoadCacheLineFromMemory需要很长时间的）
|
||
int ReLine = GetReplaceLine(Set);
|
||
UINT64 ReLineAddress = 0;
|
||
|
||
//写回：当被替换的数据为脏数据时，我们需要先将该行数据首先写入到Memory中，再执行替换
|
||
if(DCache[Set].Line[ReLine].Dirty == 1 && DCache[Set].Line[ReLine].Valid == 1)
|
||
{
|
||
ReLineAddress = (DCache[Set].Line[ReLine].Tag << (DCACHE_SET_ADDR_BITS + DCACHE_BYTES_PER_LINE_ADDR_BITS)) | ((UINT64)Set << DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
StoreCacheLineToMemory(ReLineAddress, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
//开始替换，加载新数据
|
||
LoadCacheLineFromMemory(Address, DCache[Set].Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache[Set].Line[ReLine].Valid = 1;
|
||
DCache[Set].Line[ReLine].Tag = Tag;
|
||
DCache[Set].Line[ReLine].Dirty = 0;
|
||
DCache[Set].Line[ReLine].NRU = 0;
|
||
//UpdateAge(Set, ReLine);
|
||
|
||
if(Operation == 'M' || Operation == 'S')
|
||
{
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache[Set].Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache[Set].Line[ReLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
DCache[Set].Line[ReLine].Dirty = 1;
|
||
}
|
||
//UpdateAge(Set, ReLine);
|
||
}
|
||
}
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
|
||
/* 指令Cache实现部分，可选实现 */
|
||
void InitInstCache(void)
|
||
{
|
||
return;
|
||
}
|
||
|
||
UINT8 AccessInstCache(UINT64 Address, UINT8 Operation, UINT8 InstSize,
|
||
UINT64* InstResult)
|
||
{
|
||
// ICache只有Operation = 'I'的操作，只会读。不会写
|
||
// 返回值'M' = Miss，'H'=Hit
|
||
return 'M';
|
||
}
|
||
#endif
|
||
|
||
|
||
7
|
||
#include <stdio.h>
|
||
#include "common.h"
|
||
|
||
int debug = 0;
|
||
|
||
#define DCACHE_SIZE 16384
|
||
#define DCACHE_LINES_PER_SET 4
|
||
#define DCACHE_BYTES_PER_LINE 16
|
||
|
||
#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
|
||
#define DCACHE_SET (DCACHE_SIZE/(DCACHE_BYTES_PER_LINE*DCACHE_LINES_PER_SET))
|
||
#define DCACHE_SET_ADDR_BITS GET_LOG_OF_2(DCACHE_SET)
|
||
|
||
struct DCACHE_LineStruct {
|
||
UINT8 Valid;
|
||
UINT8 NRU; // 3位RRPV实现
|
||
UINT8 Dirty;
|
||
UINT64 Tag;
|
||
UINT8 Data[DCACHE_BYTES_PER_LINE];
|
||
};
|
||
|
||
struct DCACHE_SetStruct {
|
||
struct DCACHE_LineStruct Line[4];
|
||
} DCache[DCACHE_SET];
|
||
|
||
void InitDataCache()
|
||
{
|
||
for (int s = 0; s < DCACHE_SET; s++)
|
||
{
|
||
for (int l = 0; l < 4; l++)
|
||
{
|
||
DCache[s].Line[l].Valid = 0;
|
||
DCache[s].Line[l].NRU = 6; // 初始化为最大值
|
||
DCache[s].Line[l].Dirty = 0;
|
||
DCache[s].Line[l].Tag = 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
int GetReplaceLine(UINT32 Set)
|
||
{
|
||
// 优先替换无效行
|
||
for (int i = 0; i < 4; i++) {
|
||
if (!DCache[Set].Line[i].Valid) return i;
|
||
}
|
||
|
||
// 查找NRU=7的行
|
||
for (int i = 0; i < 4; i++) {
|
||
if (DCache[Set].Line[i].NRU == 7) return i;
|
||
}
|
||
|
||
while(1)
|
||
{
|
||
// 所有行NRU加1（最大保持7）
|
||
for (int i = 0; i < 4; i++) {
|
||
DCache[Set].Line[i].NRU = (DCache[Set].Line[i].NRU < 7) ?
|
||
DCache[Set].Line[i].NRU + 1 : 7;
|
||
}
|
||
|
||
// 再次查找
|
||
for (int i = 0; i < 4; i++) {
|
||
if (DCache[Set].Line[i].NRU == 7) return i;
|
||
}
|
||
}
|
||
|
||
return 0; // 保底返回首行
|
||
}
|
||
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
UINT32 Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
UINT8 Block = Address % DCACHE_BYTES_PER_LINE;
|
||
UINT64 Tag = Address >> (DCACHE_BYTES_PER_LINE_ADDR_BITS + DCACHE_SET_ADDR_BITS);
|
||
UINT8 MissFlag = 'M';
|
||
int HitLine = -1;
|
||
|
||
// 命中检测
|
||
for (int i = 0; i < 4; i++) {
|
||
if (DCache[Set].Line[i].Valid && DCache[Set].Line[i].Tag == Tag) {
|
||
HitLine = i;
|
||
MissFlag = 'H';
|
||
DCache[Set].Line[i].NRU = 0; // 命中行NRU置0
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (MissFlag == 'H') {
|
||
if (Operation == 'L') { // 读命中
|
||
*LoadResult = 0;
|
||
for (int i = DataSize-1; i >= 0; i--) {
|
||
*LoadResult = (*LoadResult << 8) | DCache[Set].Line[HitLine].Data[Block+i];
|
||
}
|
||
}
|
||
else { // 写命中
|
||
for (int i = 0; i < DataSize; i++) {
|
||
DCache[Set].Line[HitLine].Data[Block+i] = (StoreValue >> (i*8)) & 0xFF;
|
||
}
|
||
DCache[Set].Line[HitLine].Dirty = 1;
|
||
}
|
||
}
|
||
else { // 未命中处理
|
||
if (Operation == 'L' || Operation == 'S' || Operation == 'M') {
|
||
int ReplaceLine = GetReplaceLine(Set);
|
||
struct DCACHE_LineStruct *line = &DCache[Set].Line[ReplaceLine];
|
||
|
||
// 写回脏数据
|
||
if (line->Valid && line->Dirty) {
|
||
UINT64 old_addr = (line->Tag << (DCACHE_SET_ADDR_BITS + DCACHE_BYTES_PER_LINE_ADDR_BITS))
|
||
| (Set << DCACHE_BYTES_PER_LINE_ADDR_BITS);
|
||
StoreCacheLineToMemory(old_addr, line->Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
// 加载新行（写分配）
|
||
LoadCacheLineFromMemory(Address, line->Data, DCACHE_BYTES_PER_LINE);
|
||
line->Valid = 1;
|
||
line->Tag = Tag;
|
||
line->NRU = 6; // 初始NRU设为6
|
||
line->Dirty = 0;
|
||
|
||
// 写操作处理
|
||
if (Operation != 'L') {
|
||
for (int i = 0; i < DataSize; i++) {
|
||
line->Data[Block+i] = (StoreValue >> (i*8)) & 0xFF;
|
||
}
|
||
line->Dirty = 1;
|
||
}
|
||
|
||
// 读操作设置结果
|
||
if (Operation == 'L') {
|
||
*LoadResult = 0;
|
||
for (int i = DataSize-1; i >= 0; i--) {
|
||
*LoadResult = (*LoadResult << 8) | line->Data[Block+i];
|
||
}
|
||
}
|
||
}
|
||
}
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
void InitInstCache(void) { return; }
|
||
UINT8 AccessInstCache(UINT64 a, UINT8 b, UINT8 c, UINT64* d) { return 'M'; }
|
||
#endif
|
||
|
||
9
|
||
#include <stdio.h>
|
||
#include "common.h"
|
||
|
||
// debug=1:输出额外调试信息
|
||
int debug = 0;
|
||
|
||
|
||
// 全相联Data Cache
|
||
// 容量为16384字节，每行容纳16个字节
|
||
#define DCACHE_SIZE 16384
|
||
#define DCACHE_BYTES_PER_LINE 16 // 必须是8字节的倍数
|
||
|
||
// 下面参数是自动计算的，你无须需改
|
||
#define DCACHE_BYTES_PER_LINE_ADDR_BITS GET_LOG_OF_2(DCACHE_BYTES_PER_LINE)
|
||
#define DCACHE_LINES (DCACHE_SIZE/DCACHE_BYTES_PER_LINE)
|
||
|
||
#define MAX_AGE (DCACHE_LINES-1) // 每1行有一个唯一的Age
|
||
|
||
// Cache行的结构，包括Valid、Age、Dirty、Tag和Data。你所有的状态信息，只能记录在Cache行中！
|
||
struct DCACHE_LineStruct
|
||
{
|
||
UINT8 Valid;
|
||
UINT16 Age;
|
||
UINT8 Dirty;
|
||
UINT64 Tag;
|
||
UINT8 Data[DCACHE_BYTES_PER_LINE];
|
||
};
|
||
|
||
struct DCACHE_SetStruct {
|
||
struct DCACHE_LineStruct Line[DCACHE_LINES];
|
||
} DCache;
|
||
|
||
|
||
// DCache初始化代码，模拟器启动时，会调用此InitDataCache函数
|
||
void InitDataCache()
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
for (int i = 0; i < DCACHE_LINES; i++)
|
||
{
|
||
DCache.Line[i].Valid = 0;
|
||
DCache.Line[i].Age = i;
|
||
DCache.Line[i].Tag = 0;
|
||
DCache.Line[i].Dirty = 0;
|
||
}
|
||
// *********** 你需要在上面书写代码 ***********
|
||
}
|
||
|
||
// 从所有行中，找到需要替换的Cache行
|
||
// 如果有某行的Valid=0，则返回该行行号
|
||
// 否则，返回Age最大的行的行号
|
||
int GetReplaceLine()
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
int replace_line = -1;
|
||
UINT8 max_age = 0;
|
||
|
||
for (int i = 0; i < DCACHE_LINES; i++)
|
||
{
|
||
if (!DCache.Line[i].Valid)
|
||
{
|
||
return i;
|
||
}
|
||
if (DCache.Line[i].Age > max_age)
|
||
{
|
||
max_age = DCache.Line[i].Age;
|
||
replace_line = i;
|
||
}
|
||
}
|
||
return replace_line;
|
||
// *********** 你需要在上面书写代码 ***********
|
||
return -1;
|
||
}
|
||
|
||
// 更新Age，将HitLine指定的Cache行的Age设置为0，其他行的Age要相应调整
|
||
// 注意！要确保所有行的Age分别为0~MAX_AGE，且唯一
|
||
void UpdateAge(int HitLine)
|
||
{
|
||
// *********** 你需要在下面书写代码 ***********
|
||
UINT8 old_age = DCache.Line[HitLine].Age;
|
||
DCache.Line[HitLine].Age = 0;
|
||
|
||
for (int i = 0; i < DCACHE_LINES; i++)
|
||
{
|
||
if (i != HitLine && DCache.Line[i].Valid)
|
||
{
|
||
if (DCache.Line[i].Age < old_age)
|
||
{
|
||
DCache.Line[i].Age++;
|
||
}
|
||
}
|
||
}
|
||
// *********** 你需要在上面书写代码 ***********
|
||
}
|
||
|
||
// Data Cache访问接口，Cache模拟器会调用此接口，来实现对你的Data Cache访问
|
||
// Address: 访存字节地址
|
||
// Operation: 操作：读操作（'L'）、写操作（'S'）、读-修改-写操作（'M'）
|
||
// DataSize: 数据大小：1字节、2字节、4字节、8字节
|
||
// StoreValue: 当执行写操作的时候，需要写入的数据
|
||
// LoadResult: 当执行读操作的时候，从Cache读出的数据
|
||
// 返回值：'M'表示Miss；'H'表示Hit
|
||
UINT8 AccessDataCache(UINT64 Address, UINT8 Operation, UINT8 DataSize,
|
||
UINT64 StoreValue, UINT64* LoadResult)
|
||
{
|
||
//UINT32 Set;
|
||
UINT8 Block;
|
||
UINT64 Tag;
|
||
UINT8 MissFlag = 'M';
|
||
UINT64 ReadValue;
|
||
int HitLine = 0;
|
||
UINT64 HitLineAddress = 0;
|
||
|
||
*LoadResult = 0;
|
||
|
||
|
||
// Address被划分为 Tag + Set + Block
|
||
|
||
// Set Cache的组索引（每组4行）
|
||
//Set = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) % DCACHE_SET;
|
||
Block = Address % DCACHE_BYTES_PER_LINE;
|
||
//Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS) >> DCACHE_SET_ADDR_BITS; // 地址去掉DCACHE_SET、DCACHE_BYTES_PER_LINE，剩下的作为Tag。警告！不能将整个地址作为Tag！！
|
||
Tag = (Address >> DCACHE_BYTES_PER_LINE_ADDR_BITS);
|
||
|
||
// 1. 首先需要检查对应的DCache行，其Valid位是否有效？Tag是否与AddressTag相等？
|
||
// 2. 如果Valid有效，且AddressTag相等，则意味着Cache访问“命中”
|
||
// 3. 如果“命中”，需要进一步判断是要读（'L'）还是写（'S'）或者是修改（'M'）？
|
||
MissFlag = 'M';
|
||
for (int i = 0; i < DCACHE_LINES; i++)
|
||
{
|
||
if (DCache.Line[i].Valid == 1 && DCache.Line[i].Tag == Tag)
|
||
{
|
||
MissFlag = 'H';
|
||
HitLine = i;
|
||
// HitLineAddress = ((DCache.Line[HitLine].Tag << DCACHE_SET_ADDR_BITS) <<
|
||
// DCACHE_BYTES_PER_LINE_ADDR_BITS) | ((UINT64)Set <<
|
||
// DCACHE_BYTES_PER_LINE_ADDR_BITS); // 从Tag中恢复旧的地址
|
||
break;
|
||
}
|
||
}
|
||
if (MissFlag == 'H')
|
||
{
|
||
if (Operation == 'L') // 读操作。从DCache对应行中，读取数据，注意数据宽度与对齐要求
|
||
{
|
||
ReadValue = 0;
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
ReadValue = DCache.Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
ReadValue = DCache.Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
ReadValue = DCache.Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 0];
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
ReadValue = DCache.Line[HitLine].Data[Block + 7];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 6];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 5];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 4];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 3];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 2];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 1];
|
||
ReadValue = ReadValue << 8;
|
||
ReadValue |= DCache.Line[HitLine].Data[Block + 0];
|
||
break;
|
||
}
|
||
*LoadResult = ReadValue;
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX ReadValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue, ReadValue);
|
||
}
|
||
else if (Operation == 'S' || Operation == 'M') // 写操作（修改操作在此等价于写操作）
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache.Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache.Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache.Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache.Line[HitLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[HitLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
// 写穿透：每次更新Cache行，都需要把数据同时写入Memory
|
||
//StoreCacheLineToMemory(HitLineAddress, DCache[Set].Line[HitLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache.Line[HitLine].Dirty = 1; //标记脏数据
|
||
}
|
||
UpdateAge(HitLine);
|
||
}
|
||
else
|
||
{
|
||
if (debug)
|
||
printf("[%s] Address=%016llX Operation=%c DataSize=%u StoreValue=%016llX\n",
|
||
__func__, Address, Operation, DataSize, StoreValue);
|
||
if (Operation == 'L' || Operation == 'M' || Operation == 'S') // 读操作
|
||
{
|
||
// 需要从Memory中读入新的行（真实情况下，这个LoadCacheLineFromMemory需要很长时间的）
|
||
int ReLine = GetReplaceLine();
|
||
UINT64 ReLineAddress = 0;
|
||
|
||
//写回：当被替换的数据为脏数据时，我们需要先将该行数据首先写入到Memory中，再执行替换
|
||
if(DCache.Line[ReLine].Dirty == 1 && DCache.Line[ReLine].Valid == 1)
|
||
{
|
||
ReLineAddress = DCache.Line[ReLine].Tag << DCACHE_BYTES_PER_LINE_ADDR_BITS; // 从Tag中恢复旧的地址
|
||
StoreCacheLineToMemory(ReLineAddress, DCache.Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
}
|
||
|
||
//开始替换，加载新数据
|
||
LoadCacheLineFromMemory(Address, DCache.Line[ReLine].Data, DCACHE_BYTES_PER_LINE);
|
||
DCache.Line[ReLine].Valid = 1;
|
||
DCache.Line[ReLine].Tag = Tag;
|
||
DCache.Line[ReLine].Dirty = 0;
|
||
UpdateAge(ReLine);
|
||
|
||
if(Operation == 'M' || Operation == 'S')
|
||
{
|
||
switch (DataSize)
|
||
{
|
||
case 1: // 1个字节
|
||
DCache.Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
break;
|
||
case 2: // 2个字节
|
||
Block = Block & 0xFE; // 需对齐到2字节边界
|
||
DCache.Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
break;
|
||
case 4: // 4个字节
|
||
Block = Block & 0xFC; // 需对齐到4字节边界
|
||
DCache.Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
break;
|
||
case 8: // 8个字节
|
||
Block = Block & 0xF8; // 需对齐到8字节边界
|
||
DCache.Line[ReLine].Data[Block + 0] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 1] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 2] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 3] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 4] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 5] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 6] = StoreValue & 0xFF;
|
||
StoreValue = StoreValue >> 8;
|
||
DCache.Line[ReLine].Data[Block + 7] = StoreValue & 0xFF;
|
||
break;
|
||
}
|
||
DCache.Line[ReLine].Dirty = 1;
|
||
}
|
||
//UpdateAge(ReLine);
|
||
}
|
||
}
|
||
return MissFlag;
|
||
}
|
||
|
||
#ifdef ICACHE_ENABLE
|
||
|
||
/* 指令Cache实现部分，可选实现 */
|
||
void InitInstCache(void)
|
||
{
|
||
return;
|
||
}
|
||
|
||
UINT8 AccessInstCache(UINT64 Address, UINT8 Operation, UINT8 InstSize,
|
||
UINT64* InstResult)
|
||
{
|
||
// ICache只有Operation = 'I'的操作，只会读。不会写
|
||
// 返回值'M' = Miss，'H'=Hit
|
||
return 'M';
|
||
}
|
||
#endif
|
||
|