动态页式存储管理的模拟c语言代码实现

好的，以下是一个简单的动态页式存储管理的模拟的C语言代码实现，仅供参考：

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

#define PAGE_SIZE 256 // 页面大小
#define PAGE_NUM 256 // 页面数量
#define FRAME_SIZE 256 // 物理帧大小
#define FRAME_NUM 256 // 物理帧数量
#define TLB_SIZE 16 // TLB 大小
#define PAGE_TABLE_SIZE 256 // 页表大小

// 页表项结构体
struct PageTableEntry {
    int page_num; // 页号
    int frame_num; // 对应的物理帧号
    int valid; // 是否有效
};

// TLB 缓存结构体
struct TLBEntry {
    int page_num; // 页号
    int frame_num; // 对应的物理帧号
};

// 物理地址结构体
struct PhysicalAddress {
    int frame_num; // 物理页号
    int offset; // 页内偏移量
};

// 页表和物理内存
struct PageTableEntry page_table[PAGE_TABLE_SIZE];
char physical_memory[FRAME_NUM][FRAME_SIZE];

// TLB 缓存
struct TLBEntry tlb[TLB_SIZE];
int tlb_index = 0;

// 全局计数器
int page_faults = 0;
int tlb_hits = 0;

// 从文件中读取一个逻辑地址
int read_logical_address(FILE *fp) {
    int address = 0;
    fscanf(fp, "%d", &address);
    return address;
}

// 获取页号
int get_page_number(int logical_address) {
    return (logical_address >> 8) & 0xff;
}

// 获取页内偏移量
int get_offset(int logical_address) {
    return logical_address & 0xff;
}

// 获取物理地址
struct PhysicalAddress get_physical_address(int logical_address) {
    struct PhysicalAddress physical_address;
    int page_num = get_page_number(logical_address);
    int offset = get_offset(logical_address);

    // 先在 TLB 中查找
    int frame_num = -1;
    for (int i = 0; i < TLB_SIZE; i++) {
        if (tlb[i].page_num == page_num) {
            frame_num = tlb[i].frame_num;
            tlb_hits++;
            break;
        }
    }

    // 如果 TLB 中没有找到，则从页表中查找
    if (frame_num == -1) {
        if (page_table[page_num].valid == 1) {
            frame_num = page_table[page_num].frame_num;
        } else {
            // 如果页表中没有找到，则发生缺页异常
            frame_num = page_faults % FRAME_NUM;
            page_table[page_num].frame_num = frame_num;
            page_table[page_num].valid = 1;
            page_faults++;

            // 从文件中读取页面数据
            char page_data[PAGE_SIZE];
            FILE *fp = fopen("BACKING_STORE.bin", "rb");
            fseek(fp, page_num * PAGE_SIZE, SEEK_SET);
            fread(page_data, sizeof(char), PAGE_SIZE, fp);
            fclose(fp);

            // 将页面数据写入物理内存
            for (int i = 0; i < PAGE_SIZE; i++) {
                physical_memory[frame_num][i] = page_data[i];
            }
        }

        // 将页表项添加到 TLB 缓存中
        tlb[tlb_index].page_num = page_num;
        tlb[tlb_index].frame_num = frame_num;
        tlb_index = (tlb_index + 1) % TLB_SIZE;
    }

    physical_address.frame_num = frame_num;
    physical_address.offset = offset;
    return physical_address;
}

int main() {
    FILE *fp = fopen("addresses.txt", "r");
    if (fp == NULL) {
        printf("Failed to open file.\n");
        return 1;
    }

    // 初始化页表项
    for (int i = 0; i < PAGE_TABLE_SIZE; i++) {
        page_table[i].page_num = i;
        page_table[i].frame_num = -1;
        page_table[i].valid = 0;
    }

    // 初始化 TLB 缓存
    for (int i = 0; i < TLB_SIZE; i++) {
        tlb[i].page_num = -1;
        tlb[i].frame_num = -1;
    }

    // 模拟逻辑地址转换
    int logical_address;
    while ((logical_address = read_logical_address(fp)) != EOF) {
        struct PhysicalAddress physical_address = get_physical_address(logical_address);
        char value = physical_memory[physical_address.frame_num][physical_address.offset];
        printf("Virtual address: %d Physical address: %d Value: %d\n", logical_address, physical_address.frame_num * PAGE_SIZE + physical_address.offset, value);
    }

    printf("Page faults: %d\n", page_faults);
    printf("TLB hits: %d\n", tlb_hits);

    fclose(fp);
    return 0;
}

这个代码实现了一个简单的动态页式存储管理模拟，包括了页表、物理内存、TLB 缓存等相关的数据结构和算法。该代码可以读取一个逻辑地址文件，模拟逻辑地址转换过程，并输出物理地址和对应的值，以及缺页异常和 TLB 命中次数等统计信息。