kernel/tty.c

/*By Marcus Xingkernel/tty.c处理终端的代码*/#include "type.h"#include "const.h"#include "protect.h"#include "proc.h"#include "console.h"#include "tty.h"#include "global.h"#include "keyboard.h"#include "proto.h"/* 内部函数声明 */static void Init_TTY(TTY *tty);static void TTY_Read(TTY *tty);static void TTY_Write(TTY *tty);/*------------------------------------------------------------------Init_All_TTY 初始化所有的TTY*/void Init_All_TTY(){TTY *tty;/* 初始化每个TTY */for(tty = TTY_Table;tty < TTY_Table + TTY_NUM;tty++){Init_TTY(tty);}Select_Console(0);/* 当前控制台0号 */}/*---------------------------------------------------------Put_Key_In_TTY_Buffer 把一个key放到参数指定的TTY的缓冲区中*/void Put_Key_In_TTY_Buffer(TTY *tty,u32 key){if(tty->tty_buffer_size < TTY_BUFFER_SIZE){Disable_Int();*tty->tty_tail = key;tty->tty_tail++;if(tty->tty_tail >= tty->tty_buffer + TTY_BUFFER_SIZE){tty->tty_tail = tty->tty_buffer;}tty->tty_buffer_size++;Enable_Int();}}/*----------------------------------------------------------------------Proc_TTY终端显示进程*/void Proc_TTY(){TTY *tty;/* 死循环 */while(1){/* 遍历每个TTY */for(tty = TTY_Table;tty < TTY_Table + TTY_NUM;tty++){TTY_Read(tty);TTY_Write(tty);}}}/*--------------------------------------------------------------------In_Process显示键盘输入的函数,Keyboard_Read调用*/void In_Process(TTY *tty,u32 key){/* 如果可显示，放到参数指示的TTY的缓冲区中 */if(!(key & FLAG_EXT)){Put_Key_In_TTY_Buffer(tty,key);}/* 如果不可打印，进行相应处理 */else{u32 raw_key = key & MASK_RAW; /* 保留低9位，低8位是内容，第9位是显示标记 */switch(raw_key){case POWER:Reset();break;/* 处理F1,F2,F3键 */case F1:case F2:case F3:/* 如果按下ALT + SHIFT + 1,2,3键，则进行控制台切换 */if((key & FLAG_ALT_L) || (key & FLAG_ALT_R)){Select_Console(raw_key - F1);}break;/* 处理退格键 */case BACKSPACE:Put_Key_In_TTY_Buffer(tty,'/b');/* 把'/b'丢到缓冲区 */break;/* 处理回车键 */case ENTER:Put_Key_In_TTY_Buffer(tty,'/n');/* 把'/n'丢到缓冲区 */break; /* 按下了UP键 */case UP:/* 如果按下SHIFT + UP，则上滚屏幕 */if((key & FLAG_SHIFT_L) || (key & FLAG_SHIFT_R)){Scroll_Screen(tty->console,1);}break;/* 按下了DOWN键 */case DOWN:/* 如果按下SHIFT + DOWN，则下滚屏幕 */if((key & FLAG_SHIFT_L) || (key & FLAG_SHIFT_R)){Scroll_Screen(tty->console,0);}break;}}}/*----------------------------------------------------------------------Init_TTY初始化一个TTY，仅在当前文件中调用*/static void Init_TTY(TTY *tty){/* 尾指针和头指针都指向缓冲区起始处 */tty->tty_tail = tty->tty_head = tty->tty_buffer;tty->tty_buffer_size = 0;/* 缓冲区码的数目开始为0 *//* 初始化控制台 */Init_Console(tty);}/*----------------------------------------------------------------------TTY_Read读入一个key到当前TTY的BUFFER，仅在当前文件中调用*/static void TTY_Read(TTY *tty){/* 如果参数的指示的控制台为当前控制台，则进行处理 */if(Is_Current_Console(tty->console)){Keyboard_Read(tty);}}/*---------------------------------------------------------------------TTY_Write从参数指示的TTY的BUFFER读出key来到相应的控制台上，仅在当前文件中调用*/static void TTY_Write(TTY *tty){char key;/* 如果参数指示的TTY的缓冲区大小大于0则读出一个码给Out_Char处理 */if(tty->tty_buffer_size > 0){Disable_Int();key = (char)(*tty->tty_head);tty->tty_head++;if(tty->tty_head >= tty->tty_buffer + TTY_BUFFER_SIZE){tty->tty_head = tty->tty_buffer;}tty->tty_buffer_size--;Enable_Int();Out_Char(tty->console,key);}}