1个人开发操作系统之界面与字体

1．界面

上文中我将一些信息保存到0x0ff0地址，这些信息有8bit的screen mode，屏幕高与宽，以及显示用内存地址，现在我们将这些信息保存到struct里：

struct BOOTINFO {

char cyls, leds, vmode, reserve;

short scrnx, scrny;

char *vram;

};

struct BOOTINFO *binfo = (struct BOOTINFO *) 0x0ff0;

8bit显示模式只有16色，既0-15，如果你不想使用系统默认的16色，可以自定义喜欢的16种颜色。定义方式为：

void set_palette()

{

int i, eflags;

eflags = io_load_eflags(); /*记录eflags*/

io_cli(); /*禁止中断*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>8, 0); /*向0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>8端口发送命令*/

/*begin，开始定义颜色*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4); /*R*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4); /*G*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4); /*B*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

/*end*/

io_store_eflags(eflags); /*恢复EFLAGS*/

return;

}

下面就可以绘制界面了，一个方形绘制方法如下：

void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1)

{

int x, y;

for (y = y0; y <= y1; y++) {

for (x = x0; x <= x1; x++)

vram[y * xsize + x] = c;

}

return;

}

unsigned char *vram为显示内存地址

int xsize为屏幕的宽既320

unsigned char c为颜色

int x0, int y0为方形左上角点

int x1, int y1为方形右下角点

2．字体

编写一个新C源文件，为font.c。定义一个符号方法如下：

void char_0(char *font)

{

font[0]=0x00;

font[1]=0x18;

font[2]=0x24;

font[3]=0x24;

font[4]=0x42;

font[5]=0x42;

font[6]=0x42;

font[7]=0x42;

font[8]=0x42;

font[9]=0x42;

font[10]=0x42;

font[11]=0x24;

font[12]=0x24;

font[13]=0x18;

font[14]=0x00;

font[15]=0x00;

}

char *font为内存地址，1个文字长宽为8bit，高为16bit。以上函数是定义数字0。

符号显示方法如下：

void putfont8(char *vram, int xsize, int x, int y, char c, char *font)

{

int i;

char *p, d /* data */;

for (i = 0; i < 16; i++) {

p = vram + (y + i) * xsize + x;

d = font[i];

if ((d & 0x80) != 0) { p[0] = c; }

if ((d & 0x40) != 0) { p[1] = c; }

if ((d & 0x20) != 0) { p[2] = c; }

if ((d & 0x10) != 0) { p[3] = c; }

if ((d & 0x08) != 0) { p[4] = c; }

if ((d & 0x04) != 0) { p[5] = c; }

if ((d & 0x02) != 0) { p[6] = c; }

if ((d & 0x01) != 0) { p[7] = c; }

}

return;

}

3．bootpack.c的完整源代码

/*Colimas Simple OS*/

#include "font.h"

void io_hlt(void);

void io_cli(void);

void io_out8(int port, int data);

int io_load_eflags(void);

void io_store_eflags(int eflags);

void init_palette(void);

void set_palette(void);

void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1);

void init_screen(char *vram, int x, int y);

void putfont8(char *vram, int xsize, int x, int y, char c, char *font);

void drawchar(char *vram, int xsize, int x, int y, char c, unsigned char s);

void drawstring(char *vram, int xsize, int x, int y, char c, unsigned char *s);

#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_C<chmetcnv w:st="on" unitname="C" sourcevalue="6" hasspace="False" negative="False" numbertype="1" tcsc="0">6C</chmetcnv><chmetcnv w:st="on" unitname="C" sourcevalue="6" hasspace="False" negative="False" numbertype="1" tcsc="0">6C</chmetcnv>6 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

//entry

struct BOOTINFO {

char cyls, leds, vmode, reserve;

short scrnx, scrny;

char *vram;

};

void ColimasMain(void)

{

struct BOOTINFO *binfo = (struct BOOTINFO *) 0x0ff0;

init_palette();

init_screen(binfo->vram, binfo->scrnx, binfo->scrny);

//drawstring(binfo->vram, binfo->scrnx, 18, 10, COL8_FFFFFF, s);

drawchar(binfo->vram, binfo->scrnx, 10, 10, COL8_FFFFFF, 'C');

drawchar(binfo->vram, binfo->scrnx, 18, 10, COL8_FFFFFF, 'I');

drawchar(binfo->vram, binfo->scrnx, 26, 10, COL8_FFFFFF, 'A');

for (;;) {

io_hlt();

}

}

void init_palette(void)

{

set_palette();

return;

}

void set_palette()

{

int i, eflags;

eflags = io_load_eflags();

io_cli();

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>8, 0);

/*begin*/

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00/ 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xff / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0xc6 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x00 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

io_out8(0x<chmetcnv w:st="on" unitname="C" sourcevalue="3" hasspace="False" negative="False" numbertype="1" tcsc="0">03c</chmetcnv>9, 0x84 / 4);

/*end*/

io_store_eflags(eflags);

return;

}

void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1)

{

int x, y;

for (y = y0; y <= y1; y++) {

</f