[C語言]映射函數模型實作-直接映射




範例輸入

記憶體:16MB
快取記憶體:64KB
快取區塊:4B
結果:0CE7

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#include <stdio.h>
#include <stdlib.h>
#include <math.h>

//string to HEX
//printf("%08xn",foo("0xff"))
unsigned int foo(const char * s) {
 unsigned int result = 0;
 int c ;
 if ('0' == *s && 'x' == *(s+1)) { s+=2;
  while (*s) {
   result = result << 4;
   if (c=(*s-'0'),(c>=0 && c <=9)) result|=c;
   else if (c=(*s-'A'),(c>=0 && c <=5)) result|=(c+10);
   else if (c=(*s-'a'),(c>=0 && c <=5)) result|=(c+10);
   else break;
   ++s;
  }
 }
 return result;
}

//取得2的次方
int getPower(int value){
    int count=0;
    int chk=1;
    while(chk){
        value=value/2;
        if (value<2){
            chk=0;
        }
        count++;
    }
    return count;
}


//十進制轉二進制
char * toBin(int value){
    char *s = malloc(50 * sizeof(char));
    itoa(value, s, 2);
    return s;
}

//二進制轉十六進制
void binaryToHex(const char *inStr, char *outStr) {
    // outStr must be at least strlen(inStr)/4 + 1 bytes.
    static char hex[] = "0123456789ABCDEF";
    int len = strlen(inStr) / 4;
    int i = strlen(inStr) % 4;
    char current = 0;
    if(i) { // handle not multiple of 4
        while(i--) {
            current = (current << 1) + (*inStr - '0');
            inStr++;
        }
        *outStr = hex[current];
        ++outStr;
    }
    while(len--) {
        current = 0;
        for(i = 0; i < 4; ++i) {
            current = (current << 1) + (*inStr - '0');
            inStr++;
        }
        *outStr = hex[current];
        ++outStr;
    }
    *outStr = 0; // null byte
}


int main(int argc, char** argv) {
    //
 int ramSize_MB;
 int cacheMemSize_KB;
 int cacheBlockSize_B;

 //
    int memAddress;
    char memAddress_s[50];

 //參數輸入;
    printf("RAM size(MB):");
    scanf("%d", &ramSize_MB);

    printf("Cache mem size(KB):");
    scanf("%d", &cacheMemSize_KB);

    printf("Cache block size(Byte):");
    scanf("%d", &cacheBlockSize_B);

    printf("Input a mem address(HEX):nExample:0x113609Cn");
    scanf("%s", memAddress_s);

    memAddress=foo(memAddress_s);



    //
    ramSize_MB=ramSize_MB*pow(2, 20);
    cacheMemSize_KB=cacheMemSize_KB*pow(2, 10);

    //
    printf("n");
    printf("切分成(塊):%dn",ramSize_MB/cacheMemSize_KB);

    //線路
    printf("每個區塊大小(KB):%dn",cacheMemSize_KB/1024);

    //每個區塊含有(條)線路
    printf("每個區塊含有(條)線路:%dn",cacheMemSize_KB/cacheBlockSize_B);
    //int totalPath=cacheMemSize_KB/cacheBlockSize_B;

    //記憶體位置長度
    printf("總長度(bits):%dn",getPower(ramSize_MB));
    int memLength=getPower(ramSize_MB);

    //
    printf("線路需要?bits定址:%dn",getPower(cacheMemSize_KB/cacheBlockSize_B));
    int pathNeedBits=getPower(cacheMemSize_KB/cacheBlockSize_B);

    //
    printf("字組需要?bits定址:%dn",getPower(cacheBlockSize_B));
    int wordsNeedBits=getPower(cacheBlockSize_B);

    //標籤大小(剩下沒用到的定址空間)
    printf("標籤可用大小(bits):%dn",memLength-pathNeedBits-wordsNeedBits);
    int tagSize=memLength-pathNeedBits-wordsNeedBits;

    //處理輸入的記憶體
    printf("n");
    printf("MEM(HEX):0x%xn",memAddress);
    printf("MEM(BIN):%sn",toBin(memAddress));
    char *memAddress_bin=malloc(50 * sizeof(char));
    memAddress_bin=toBin(memAddress);

    //算陣列長度>取得位移
    int length=0;
    while(memAddress_bin[length]!=0){length++;} // array final char 
    length++;
    int shifting=length % 4;
 //printf("%dn",length % 4);


    printf("標籤:");
    int flag,flag2,flag3;
    for(flag=0;flag<tagSize-(shifting+1);flag++){
        printf("%c",memAddress_bin[flag]);
    }
    //printf("n%d",flag);

    printf("線路:");
    char cachePathNum[50];
    int tmpCount=0;
    flag2=flag;
    for(flag=flag;flag<(pathNeedBits+flag2);flag++){
        printf("%c",memAddress_bin[flag]);
        cachePathNum[tmpCount]=memAddress_bin[flag];
        tmpCount++;
    }

    printf("字組:");
    flag3=flag;
     for(flag=flag;flag<(wordsNeedBits+flag3);flag++){
        printf("%c",memAddress_bin[flag]);
    }

    //結果
    binaryToHex(cachePathNum,cachePathNum);
    printf("n快取線路:0x%s",cachePathNum);


 return 0;
}

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