增加文件系统

build.py

@@ -92,5 +92,5 @@ def linker(): #交叉编译链接
 if a != 0:
     exit(-1)
 
-os.system("qemu-system-i386 -kernel isodir\\sys\\kernel.elf")
+os.system("qemu-system-i386 -kernel isodir\\sys\\kernel.elf -drive format=qcow2,file=cpos.qcow2")
 

driver/disk.c

@@ -0,0 +1,73 @@
+#include "../include/disk.h"
+#include "../include/io.h"
+
+void wait_disk_ready()
+{
+    while (1)
+    {
+        int data = io_in8(0x1f7);
+        if ((data & 0x88) == 0x08) // 第3位为1表示硬盘控制器已准备好数据传输，第7位为1表示硬盘忙。
+        {
+            return;
+        }
+    }
+}
+
+void select_sector(int lba)
+{
+    io_out8(0x1f2, 1);
+    io_out8(0x1f3, lba);
+    io_out8(0x1f4, lba >> 8);
+    io_out8(0x1f5, lba >> 16);
+    io_out8(0x1f6, (((lba >> 24) & 0x0f) | 0xe0));
+}
+
+void read_disk_one_sector(int lba, unsigned int memory_addrress)
+{
+    while (io_in8(0x1f7) & 0x80)
+        ;
+    select_sector(lba);
+    io_out8(0x1f7, 0x20);
+    wait_disk_ready();
+    for (int i = 0; i < 256; i++)
+    {
+        short data = (short)io_in16(0x1f0);
+        *((short *)memory_addrress) = data;
+        memory_addrress += 2;
+    }
+}
+
+void write_disk_one_sertor(int lba, unsigned int memory_addrress)
+{
+    while (io_in8(0x1f7) & 0x80)
+        ;
+    select_sector(lba);
+    io_out8(0x1f7, 0x30);
+    wait_disk_ready();
+    for (int i = 0; i < 256; i++)
+    {
+        short data = *((short *)memory_addrress);
+        io_out16(0x1f0, data);
+        memory_addrress += 2;
+    }
+}
+
+void read_disk(int lba, int sector_count, unsigned int memory_addrress)
+{
+    for (int i = 0; i < sector_count; i++)
+    {
+        read_disk_one_sector(lba, memory_addrress);
+        lba++;
+        memory_addrress += 512;
+    }
+}
+
+void write_disk(int lba, int sector_count, unsigned int memory_addrress)
+{
+    for (int i = 0; i < sector_count; i++)
+    {
+        write_disk_one_sertor(lba, memory_addrress);
+        lba++;
+        memory_addrress += 512;
+    }
+}

include/disk.h

@@ -0,0 +1,11 @@
+#ifndef CPOS_DISK_H
+#define CPOS_DISK_H
+
+void wait_disk_ready(); //不适用于SATA硬盘
+void select_sector(int lba);
+void read_disk_one_sector(int lba, unsigned int memory_addrress);
+void write_disk_one_sertor(int lba, unsigned int memory_addrress);
+void read_disk(int lba, int sector_count, unsigned int memory_addrress);
+void write_disk(int lba, int sector_count, unsigned int memory_addrress);
+
+#endif

include/fat16.h

@@ -0,0 +1,48 @@
+#ifndef CPOS_FAT16_H
+#define CPOS_FAT16_H
+
+#define SECTOR_SIZE 512
+#define FAT1_SECTORS 32                                     //FAT1占用扇区数
+#define ROOT_DIR_SECTORS 32                                 //根目录占用扇区数
+#define SECTOR_NUM_OF_FAT1_START 1                          //FAT1起始扇区号
+#define SECTOR_NUM_OF_ROOT_DIR_START 33                     //根目录起始扇区号
+#define SECTOR_NUM_OF_DATA_START 65                         //数据区起始扇区号，对应簇号为2。
+#define SECTOR_CLUSTER_BALANCE SECTOR_NUM_OF_DATA_START - 2 //簇号加上该值正好对应扇区号。
+#define MAX_FILE_NUM 16                                     //最大文件数
+
+// FAT16目录项结构(32B);
+struct File {
+    // 文件名 如果第一个字节为0xe5，代表这个文件已经被删除；如果第一个字节为0x00，代表这一段不包含任何文件名信息。
+    unsigned char name[8];
+    unsigned char ext[3]; // 扩展名
+    // 属性：bit0只读文件，bit1隐藏文件，bit2系统文件，bit3非文件信息(比如磁盘名称)，bit4目录，bit5文件。
+    unsigned char type; // 0x20 文件 | 0x10 目录
+    unsigned char reserve[10]; // 保留
+    unsigned short time;       // 最后一次写入时间
+    unsigned short date;       // 最后一次写入日期
+    unsigned short clustno;    // 起始簇号
+    unsigned int size;         // 文件大小
+};
+
+void read_root_dir_sector1(struct File *root_entries);
+void save_root_dir_sector1(struct File *root_entries);
+void read_one_cluster(unsigned short clustno, unsigned int memory_addrress);
+int read_root_dir(struct File *file_infos);
+void get_fat1(unsigned short *fat1);
+void save_fat1(unsigned short *fat1);
+void get_file_all_clustnos(unsigned short first_clustno, unsigned short *clustnos);
+void get_file_all_clustnos(unsigned short first_clustno, unsigned short *clustnos);
+void read_file(struct File *file, void *file_addr);
+void check_name_or_ext(char *str, int len);
+void check_name_and_ext(char *name, char *ext);
+void analyse_fullname(char *fullname, char *name, char *ext);
+int find_file(char *name, char *ext, struct File *const file);
+struct File *create_file(char *fullname);
+struct File *create_dir(char *fullname);
+struct File *open_file(char *fullname);
+void alter_file_name(struct File *file, char *new_fullname);
+void alter_dir_entry(struct File *file);
+void save_file(struct File *file, char *content);
+void delete_file(struct File *file);
+
+#endif

include/multiboot.h

@@ -3,7 +3,7 @@
 
 #include <stdint.h>
 
-#define VERSION "0.0.1"
+#define VERSION "0.0.2"
 #define LOADER_SAVE_GRAPHICS_ADDRESS 0xB8000 // loader中保存显存地址的地址
 #define VARTUAL_GRAPHICS_ADDRESS 0xe0000000
 

include/shell.h

@@ -10,5 +10,8 @@ void setup_shell();
 
 //内置命令
 void end_echo(int argc,char **argv);
+void cmd_ls();
+void cmd_cat(int argc,char **argv);
+void cmd_read(int argc,char **argv);
 
 #endif