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30天自制操作系统 - 详解系统函数和结构体

2022/1/1 1:01:24

30天自制操作系统 - 详解系统函数和结构体

索引

  • 30天自制操作系统 - 详解系统函数和结构体
    • haribote
      • bootpack.h
        • 源代码
        • 详解结构体

haribote

bootpack.h

源代码

/＊ asmhead.nas ＊/
struct BOOTINFO { /＊ 0x0ff0.0x0fff ＊/   /＊ 5.2, 6.3, 18.7 ＊/
    char cyls; /＊ 引导扇区读取到磁盘的哪个位置 ＊/
    char leds; /＊ 引导时键盘的LED状态 ＊/
    char vmode; /＊ 显卡的颜色位数 ＊/
    char reserve;
    short scrnx, scrny; /＊ 画面分辨率 ＊/
    char ＊vram;
};
#define ADR_BOOTINFO     0x00000ff0
#define ADR_DISKIMG      0x00100000

/＊ naskfunc.nas ＊/
void io_hlt(void);  /＊ 3.9, 4.6 ＊/
void io_cli(void);  /＊ 4.6 ＊/
void io_sti(void);  /＊ 4.6 ＊/
void io_stihlt(void);   /＊ 4.6 ＊/
int io_in8(int port);   /＊ 4.6 ＊/
void io_out8(int port, int data);   /＊ 4.6 ＊/
int io_load_eflags(void);   /＊ 4.6 ＊/
void io_store_eflags(int eflags);   /＊ 4.6 ＊/
void load_gdtr(int limit, int addr);     /＊ 6.4 ＊/
void load_idtr(int limit, int addr);
int load_cr0(void); /＊ 9.2 ＊/
void store_cr0(int cr0);     /＊ 9.2 ＊/
void load_tr(int tr);   /＊ 15.1 ＊/
void asm_inthandler0c(void);     /＊ 22.2 ＊/
void asm_inthandler0d(void);     /＊ 21.5, 21.6 ＊/
void asm_inthandler20(void);     /＊ 12.1, 21.4, 21.6 ＊/
void asm_inthandler21(void);     /＊ 6.6 ＊/
void asm_inthandler2c(void);
unsigned int memtest_sub(unsigned int start, unsigned int end); /＊ 9.2, 9.3 ＊/
void farjmp(int eip, int cs);   /＊ 15.3 ＊/
void farcall(int eip, int cs);  /＊ 20.4 ＊/
void asm_hrb_api(void); /＊ 20.8, 21.4, 21.6 ＊/
void start_app(int eip, int cs, int esp, int ds, int ＊tss_esp0);     /＊ 21.4, 21.6 ＊/
void asm_end_app(void); /＊ 22.3 ＊/

/＊ fifo.c ＊/
struct FIFO32 { /＊ 13.4, 16.2 ＊/
    int ＊buf;
    int p, q, size, free, flags;
    struct TASK ＊task;
};
void fifo32_init(struct FIFO32 ＊fifo, int size, int ＊buf, struct TASK ＊task);   /＊ 13.4, 16.2 ＊/
int fifo32_put(struct FIFO32 ＊fifo, int data);  /＊ 13.4, 16.2, 16.4, 16.5 ＊/
int fifo32_get(struct FIFO32 ＊fifo);     /＊ 13.4 ＊/
int fifo32_status(struct FIFO32 ＊fifo); /＊ 13.4 ＊/

/＊ graphic.c ＊/
void init_palette(void);     /＊ 4.6, 25.2 ＊/
void set_palette(int start, int end, unsigned char ＊rgb);   /＊ 4.6 ＊/
void boxfill8(unsigned char ＊vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1);
/＊ 4.7 ＊/
void init_screen8(char ＊vram, int x, int y);
void putfont8(char ＊vram, int xsize, int x, int y, char c, char ＊font); /＊ 5.4 ＊/
void putfonts8_asc(char ＊vram, int xsize, int x, int y, char c, unsigned char ＊s);  /＊ 5.6, 28.5,
  28.6, 28.7 ＊/
void init_mouse_cursor8(char ＊mouse, char bc);  /＊ 5.8 ＊/
void putblock8_8(char ＊vram, int vxsize, int pxsize,     /＊ 5.8 ＊/
    int pysize, int px0, int py0, char ＊buf, int bxsize);
#define COL8_000000      0
#define COL8_FF0000      1
#define COL8_00FF00      2
#define COL8_FFFF00      3
#define COL8_0000FF      4
#define COL8_FF00FF      5
#define COL8_00FFFF      6
#define COL8_FFFFFF      7
#define COL8_C6C6C6      8
#define COL8_840000      9
#define COL8_008400      10
#define COL8_848400      11
#define COL8_000084      12
#define COL8_840084      13
#define COL8_008484      14
#define COL8_848484      15

/＊ dsctbl.c ＊/
struct SEGMENT_DESCRIPTOR { /＊ 5.9, 6.4 ＊/
    short limit_low, base_low;
    char base_mid, access_right;
    char limit_high, base_high;
};
struct GATE_DESCRIPTOR {     /＊ 5.9 ＊/
    short offset_low, selector;
    char dw_count, access_right;
    short offset_high;
};
void init_gdtidt(void); /＊ 5.9, 12.1, 20.5, 20.8, 21.5, 21.6, 22.2 ＊/
void set_segmdesc(struct SEGMENT_DESCRIPTOR ＊sd, unsigned int limit, int base, int ar); /＊ 5.9,
  6.4 ＊/
void set_gatedesc(struct GATE_DESCRIPTOR ＊gd, int offset, int selector, int ar);     /＊ 5.9 ＊/
#define ADR_IDT          0x0026f800
#define LIMIT_IDT        0x000007ff
#define ADR_GDT          0x00270000
#define LIMIT_GDT        0x0000ffff
#define ADR_BOTPAK       0x00280000
#define LIMIT_BOTPAK     0x0007ffff
#define AR_DATA32_RW     0x4092
#define AR_CODE32_ER     0x409a
#define AR_LDT           0x0082
#define AR_TSS32         0x0089
#define AR_INTGATE32     0x008e

/＊ int.c ＊/
void init_pic(void);     /＊ 6.5 ＊/
#define PIC0_ICW1        0x0020
#define PIC0_OCW2        0x0020
#define PIC0_IMR         0x0021
#define PIC0_ICW2        0x0021
#define PIC0_ICW3        0x0021
#define PIC0_ICW4        0x0021
#define PIC1_ICW1        0x00a0
#define PIC1_OCW2        0x00a0
#define PIC1_IMR         0x00a1
#define PIC1_ICW2        0x00a1
#define PIC1_ICW3        0x00a1
#define PIC1_ICW4        0x00a1

/＊ keyboard.c ＊/
void inthandler21(int ＊esp);     /＊ 6.6, 7.1, 7.2, 7.3, 7.4, 7.5, 13.4 ＊/
void wait_KBC_sendready(void);  /＊ 7.6 ＊/
void init_keyboard(struct FIFO32 ＊fifo, int data0); /＊ 7.6, 13.4 ＊/
#define PORT_KEYDAT      0x0060
#define PORT_KEYCMD      0x0064

/＊ mouse.c ＊/
struct MOUSE_DEC {  /＊ 8.2, 8.3 ＊/
    unsigned char buf[3], phase;
    int x, y, btn;
};
void inthandler2c(int ＊esp);   /＊ 6.6, 7.7 ＊/
void enable_mouse(struct FIFO32 ＊fifo, int data0, struct MOUSE_DEC ＊mdec);  /＊ 7.6, 8.2, 13.4 ＊/
int mouse_decode(struct MOUSE_DEC ＊mdec, unsigned char dat);     /＊ 8.2, 8.3 ＊/

/＊ memory.c ＊/
#define MEMMAN_FREES         4090     /＊ 约32KB ＊/
#define MEMMAN_ADDR          0x003c0000
struct FREEINFO {   /＊ 剩余容量信息 ＊/  /＊ 9.4 ＊/
    unsigned int addr, size;
};
struct MEMMAN {      /＊内存管理＊/     /＊ 9.4 ＊/
    int frees, maxfrees, lostsize, losts;
    struct FREEINFO free[MEMMAN_FREES];
};
unsigned int memtest(unsigned int start, unsigned int end); /＊ 9.2 ＊/
void memman_init(struct MEMMAN ＊man);   /＊ 9.4 ＊/
unsigned int memman_total(struct MEMMAN ＊man);  /＊ 9.4 ＊/
unsigned int memman_alloc(struct MEMMAN ＊man, unsigned int size);   /＊ 9.4 ＊/
int memman_free(struct MEMMAN ＊man, unsigned int addr, unsigned int size);  /＊ 9.4 ＊/
unsigned int memman_alloc_4k(struct MEMMAN ＊man, unsigned int size);     /＊ 10.1 ＊/
int memman_free_4k(struct MEMMAN ＊man, unsigned int addr, unsigned int size);   /＊ 10.1 ＊/

/＊ sheet.c ＊/
#define MAX_SHEETS       256
struct SHEET {  /＊ 10.2, 11.3, 23.8 ＊/
    unsigned char ＊buf;
    int bxsize, bysize, vx0, vy0, col_inv, height, flags;
    struct SHTCTL ＊ctl;
    struct TASK ＊task;
};
struct SHTCTL { /＊ 10.2, 11.8 ＊/
    unsigned char ＊vram, ＊map;
    int xsize, ysize, top;
    struct SHEET ＊sheets[MAX_SHEETS];
    struct SHEET sheets0[MAX_SHEETS];
};
struct SHTCTL ＊shtctl_init(struct MEMMAN ＊memman, unsigned char ＊vram, int xsize, int ysize);
   /* 10.2, 11.3, 11.8 */
struct SHEET ＊sheet_alloc(struct SHTCTL ＊ctl);  /* 10.2, 23.8 */
void sheet_setbuf(struct SHEET ＊sht, unsigned char ＊buf, int xsize, int ysize, int col_inv);
  /* 10.2 */
void sheet_updown(struct SHEET ＊sht, int height);   /* 10.2, 11.3, 11.7, 11.8 */
void sheet_refresh(struct SHEET ＊sht, int bx0, int by0, int bx1, int by1);  /＊ 10.2, 10.3, 11.3,
  11.7, 11.8 ＊/
void sheet_slide(struct SHEET ＊sht, int vx0, int vy0);  /＊ 10.2, 10.3, 11.3, 11.7, 11.8 ＊/
void sheet_free(struct SHEET ＊sht); /＊ 10.2, 11.3 ＊/

/＊ timer.c ＊/
#define MAX_TIMER        500
struct TIMER {  /＊ 12.4, 13.4, 13.5, 24.8 ＊/
    struct TIMER ＊next;
    unsigned int timeout;
    char flags, flags2;
    struct FIFO32 ＊fifo;
    int data;
};
struct TIMERCTL {   /＊ 12.2, 12.3, 12.4, 12.6, 12.7, 13.5 ＊/
    unsigned int count, next;
    struct TIMER ＊t0;
    struct TIMER timers0[MAX_TIMER];
};
extern struct TIMERCTL timerctl;
void init_pit(void);     /＊ 12.1, 12.2, 12.3, 12.4, 12.6, 12.7, 13.6 ＊/
struct TIMER ＊timer_alloc(void);     /＊ 12.4, 12.7, 24.8 ＊/
void timer_free(struct TIMER ＊timer);   /＊ 12.4 ＊/
void timer_init(struct TIMER ＊timer, struct FIFO32 ＊fifo, int data);     /＊ 12.4, 13.4 ＊/
void timer_settime(struct TIMER ＊timer, unsigned int timeout);  /＊ 12.4, 12.5, 12.6, 12.7, 13.5,
  13.6 ＊/
void inthandler20(int ＊esp);    /＊ 12.1, 12.2, 12.3, 12.4, 12.5, 12.6, 12.7, 13.4, 13.5, 13.6, 15.7 ＊/
int timer_cancel(struct TIMER ＊timer);  /＊ 24.8 ＊/
void timer_cancelall(struct FIFO32 ＊fifo);  /＊ 24.8 ＊/

/＊ mtask.c ＊/
#define MAX_TASKS        1000     /* 最大任务数量 */
#define TASK_GDT0        3       /* TSS从GDT的几号开始分配 */
#define MAX_TASKS_LV     100
#define MAX_TASKLEVELS  10
struct TSS32 {  /＊ 15.1, 16.1 ＊/
    int backlink, esp0, ss0, esp1, ss1, esp2, ss2, cr3;
    int eip, eflags, eax, ecx, edx, ebx, esp, ebp, esi, edi;
    int es, cs, ss, ds, fs, gs;
    int ldtr, iomap;
};
struct TASK {   /＊ 16.1, 16.4, 16.5, 17.4, 25.6, 26.7, 27.4, 28.3, 28.4, 28.5, 28.6 ＊/
    int sel, flags; /* sel代表GDT编号 */
    int level, priority;
    struct FIFO32 fifo;
    struct TSS32 tss;
    struct SEGMENT_DESCRIPTOR ldt[2];
    struct CONSOLE ＊cons;
    int ds_base, cons_stack;
      struct FILEHANDLE ＊fhandle;

    int ＊fat;
    char ＊cmdline;
    unsigned char langmode, langbyte1;
};
struct TASKLEVEL {  /＊ 16.5 ＊/
    int running; /*活动的任务数量*/
    int now; /*保存当前活动任务的变量*/
    struct TASK ＊tasks[MAX_TASKS_LV];
};
struct TASKCTL {     /＊ 16.1, 16.5 ＊/
    int now_lv; /* 当前活动的层级 */
    char lv_change; /* 下次切换任务时是否需要改变层级 */
    struct TASKLEVEL level[MAX_TASKLEVELS];
    struct TASK tasks0[MAX_TASKS];
};
extern struct TASKCTL ＊taskctl;
extern struct TIMER ＊task_timer;
struct TASK ＊task_now(void);     /＊ 16.5 ＊/
struct TASK ＊task_init(struct MEMMAN ＊memman);  /＊ 16.1, 16.4, 16.5, 17.1, 27.4 ＊/
struct TASK ＊task_alloc(void);  /＊ 16.1, 22.3, 27.4 ＊/
void task_run(struct TASK ＊task, int level, int priority);  /＊ 16.1, 16.4, 16.5 ＊/
void task_switch(void); /＊ 16.1, 16.4, 16.5 ＊/
void task_sleep(struct TASK ＊task); /＊ 16.2, 16.5 ＊/

/＊ window.c ＊/
void make_window8(unsigned char ＊buf, int xsize, int ysize, char ＊title, char act); /＊ 11.4, 16.3,
  17.3 ＊/
void putfonts8_asc_sht(struct SHEET ＊sht, int x, int y, int c, int b, char ＊s, int l);  /＊ 13.1,
  29.1 ＊/
void make_textbox8(struct SHEET ＊sht, int x0, int y0, int sx, int sy, int c);   /＊ 14.6 ＊/
void make_wtitle8(unsigned char ＊buf, int xsize, char ＊title, char act);     /＊ 17.3 ＊/
void change_wtitle8(struct SHEET ＊sht, char act);   /＊ 24.5 ＊/

/＊ console.c ＊/
struct CONSOLE {     /＊ 20.1, 23.6 ＊/
    struct SHEET ＊sht;
    int cur_x, cur_y, cur_c;
    struct TIMER ＊timer;
};
struct FILEHANDLE { /＊ 28.3 ＊/
    char ＊buf;
    int size;
    int pos;
};
void console_task(struct SHEET ＊sheet, int memtotal);
    /＊ 17.2, 17.4, 18.2, 18.3, 18.4, 18.5, 18.6, 18.7, 19.1, 19.2, 19.3,
        19.5, 20.1, 20.2, 25.6, 25.10, 26.8, 26.10, 27.2, 28.3, 28.4, 28.5, 28.6 ＊/
void cons_putchar(struct CONSOLE ＊cons, int chr, char move);     /＊ 20.1, 26.10 ＊/
void cons_newline(struct CONSOLE ＊cons);     /＊ 20.1, 26.10, 28.6 ＊/
void cons_putstr0(struct CONSOLE ＊cons, char ＊s);   /＊ 20.8 ＊/
void cons_putstr1(struct CONSOLE ＊cons, char ＊s, int l);     /＊ 20.8 ＊/
void cons_runcmd(char ＊cmdline, struct CONSOLE ＊cons, int ＊fat, int memtotal);
    /＊ 20.1, 20.6, 20.8, 26.7, 26.9, 26.10, 28.5 ＊/
void cmd_mem(struct CONSOLE ＊cons, int memtotal);   /＊ 20.1, 20.8 ＊/
void cmd_cls(struct CONSOLE ＊cons); /＊ 20.1 ＊/
void cmd_dir(struct CONSOLE ＊cons); /＊ 20.1, 20.8 ＊/
void cmd_exit(struct CONSOLE ＊cons, int ＊fat);  /＊ 26.7, 26.10 ＊/
void cmd_start(struct CONSOLE ＊cons, char ＊cmdline, int memtotal);  /＊ 26.9 ＊/
void cmd_ncst(struct CONSOLE ＊cons, char ＊cmdline, int memtotal);   /＊ 26.10 ＊/
void cmd_langmode(struct CONSOLE ＊cons, char ＊cmdline); /＊ 28.5, 28.7 ＊/
int cmd_app(struct CONSOLE ＊cons, int ＊fat, char ＊cmdline);
/＊ 20.6, 21.1, 21.2, 21.4, 21.6, 22.4, 23.8, 24.5, 24.8, 25.6, 25.7, 27.4, 28.3, 28.6, 29.2 ＊/
int ＊hrb_api(int edi, int esi, int ebp, int esp, int ebx, int edx, int ecx, int eax);
    /＊ 21.6, 22.1, 22.4, 22.5, 22.6, 23.1, 23.2, 23.3, 23.4, 23.5, 23.6, 23.8,
        24.5, 24.7, 24.8, 25.1, 25.4, 25.6, 26.2, 27.2, 28.3, 28.4, 28.7, 29.2, 29.5 ＊/
int ＊inthandler0d(int ＊esp);     /＊ 21.6, 22.2, 25.6 ＊/
int ＊inthandler0c(int ＊esp);     /＊ 22.2, 25.6 ＊/
void hrb_api_linewin(struct SHEET ＊sht, int x0, int y0, int x1, int y1, int col);   /＊ 23.4 ＊/

/＊ file.c ＊/
struct FILEINFO {   /＊ 18.7, 19.1 ＊/
    unsigned char name[8], ext[3], type;
    char reserve[10];
    unsigned short time, date, clustno;
    unsigned int size;
};
void file_readfat(int ＊fat, unsigned char ＊img);     /＊ 19.3 ＊/
void file_loadfile(int clustno, int size, char ＊buf, int ＊fat, char ＊img);  /＊ 19.3 ＊/
struct FILEINFO ＊file_search(char ＊name, struct FILEINFO ＊finfo, int max);  /＊ 20.1 ＊/
char ＊file_loadfile2(int clustno, int ＊psize, int ＊fat);     /＊ 29.2 ＊/

/＊ tek.c ＊/
int tek_getsize(unsigned char ＊p);  /＊ 29.2 ＊/
int tek_decomp(unsigned char ＊p, char ＊q, int size);     /＊ 29.2 ＊/

/＊ bootpack.c ＊/
struct TASK ＊open_constask(struct SHEET ＊sht, unsigned int memtotal);   /＊ 26.10 ＊/
struct SHEET ＊open_console(struct SHTCTL ＊shtctl, unsigned int memtotal);   /＊ 26.5, 26.7, 26.10 ＊/

注: 摘自《30天自制操作系统》附录，注释块中的数字表示进行过修改的章节。由于原书的全/半角字符与Markdown高亮显示器的匹配字符不一致，因此部分注释未按预定效果显示。

详解结构体

BOOTINFO

struct BOOTINFO { /＊ 0x0ff0.0x0fff ＊/   /＊ 5.2, 6.3, 18.7 ＊/
    char cyls; /＊ 引导扇区读取到磁盘的哪个位置 ＊/    
    char leds; /＊ 引导时键盘的LED状态 ＊/    
    char vmode; /＊ 显卡的颜色位数 ＊/    
    char reserve;    
    short scrnx, scrny;
    char ＊vram;
};

BOOTINFO结构体由6个成员组成，共占9个字节。其中，cyls表示引导扇区读取到磁盘的位置；leds表示引导时键盘LED灯的状态；vmode表示VGA显卡的颜色位数；reserve是保留的1个字节；scrnx和scrny表示画面分辨率，单位像素；vram是VGA显卡的RAM首地址。
bootpack.c中强制将启动信息的地址定义为BOOTINFO的结构体指针，再使用箭头记号->获取启动信息。

仍在写作中，APP上没法保存草稿箱…