2.7.3 对键盘进行设置
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2.7.3 对键盘进行设置
对键盘进行设置是先将键盘中断服务程序与IDT相挂接,然后取消8259A中对键盘中断的屏蔽,允许IRQ1发送中断信号,通过先禁止键盘工作、再允许键盘工作,键盘便能够使用了。键盘中断处理程序与IDT的挂接函数set_intr_gate()与前面讲解过的set_trap_gate()函数类似,参看对set_trap_gate()函数的讲解。
效果如图2-15所示。
执行代码如下:
- //代码路径:kernel/chr_dev/console.c:
- …
- #define ORIG_X (*(unsigned char *)0x90000)
- #define ORIG_Y (*(unsigned char *)0x90001)
- #define ORIG_VIDEO_PAGE (*(unsigned short *)0x90004)
- #define ORIG_VIDEO_MODE ((*(unsigned short *)0x90006) & 0xff)
- #define ORIG_VIDEO_COLS (((*(unsigned short *)0x90006) & 0xff00) >> 8)
- #define ORIG_VIDEO_LINES (25)
- #define ORIG_VIDEO_EGA_AX (*(unsigned short *)0x90008)
- #define ORIG_VIDEO_EGA_BX (*(unsigned short *)0x9000a)
- #define ORIG_VIDEO_EGA_CX (*(unsigned short *)0x9000c)
- #define VIDEO_TYPE_MDA 0x10 /* Monochrome Text Display */
- #define VIDEO_TYPE_CGA 0x11 /* CGA Display */
- #define VIDEO_TYPE_EGAM 0x20 /* EGA/VGA in Monochrome Mode */
- #define VIDEO_TYPE_EGAC 0x21 /* EGA/VGA in Color Mode */
- #define NPAR 16
- …
- void con_init(void)
- {
- register unsigned char a;
- char *display_desc= "????";
- char *display_ptr;
- video_num_columns= ORIG_VIDEO_COLS;//参看机器系统数据
- video_size_row= video_num_columns * 2;
- video_num_lines= ORIG_VIDEO_LINES;
- video_page= ORIG_VIDEO_PAGE; //参看机器系统数据
- video_erase_char= 0x0720;
- if (ORIG_VIDEO_MODE== 7) /* Is this a monochrome display? */
- {
- video_mem_start= 0xb0000;
- video_port_reg= 0x3b4;
- video_port_val= 0x3b5;
- if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) //参看机器系统数据
- {
- video_type= VIDEO_TYPE_EGAM;
- video_mem_end= 0xb8000;
- display_desc= "EGAm";
- }
- else
- {
- video_type= VIDEO_TYPE_MDA;
- video_mem_end = 0xb2000;
- display_desc= "*MDA";
- }
- }
- else /* If not, it is color. */
- {
- video_mem_start= 0xb8000;
- video_port_reg = 0x3d4;
- video_port_val = 0x3d5;
- if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) //参看机器系统数据
- {
- video_type= VIDEO_TYPE_EGAC;
- video_mem_end= 0xbc000;
- display_desc= "EGAc";
- }
- else
- {
- video_type= VIDEO_TYPE_CGA;
- video_mem_end= 0xba000;
- display_desc= "*CGA";
- }
- }
- /* Let the user known what kind of display driver we are using */
- display_ptr= ((char *)video_mem_start) + video_size_row - 8;
- while (*display_desc)
- {
- *display_ptr++= *display_desc++;
- display_ptr++;
- }
- /* Initialize the variables used for scrolling (mostly EGA/VGA) */
- origin = video_mem_start;
- scr_end = video_mem_start + video_num_lines * video_size_row;
- top = 0;
- bottom = video_num_lines;
- gotoxy(ORIG_X,ORIG_Y); //参看机器系统数据
- set_trap_gate(0x21,&keyboard_interrupt);//设置键盘中断,参看2.5节
- outb_p(inb_p(0x21)&0xfd,0x21);// 取消对键盘中断的屏蔽,允许IRQ1
- a=inb_p(0x61);
- outb_p(a|0x80,0x61); // 禁止键盘工作
- outb(a,0x61); //再允许键盘工作
- }
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