console.c

这是《自己动手写操作系统》的原文件和代码

/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                              console.c
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
                                                    Forrest Yu, 2005
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/

/*
	回车键:	把光标移到第一列
	换行键:	把光标前进到下一行
*/


#include "type.h"
#include "const.h"
#include "protect.h"
#include "string.h"
#include "proc.h"
#include "tty.h"
#include "console.h"
#include "global.h"
#include "keyboard.h"
#include "proto.h"


/* 本文件内函数声明 */
PRIVATE void	set_cursor(unsigned int position);


/*======================================================================*
                           out_char
 *======================================================================*/
PUBLIC void out_char(CONSOLE* p_con, char ch)
{
	t_8* p_vmem = (t_8*)(V_MEM_BASE + disp_pos);

	*p_vmem++ = ch;
	*p_vmem++ = DEFAULT_CHAR_COLOR;
	disp_pos += 2;

	set_cursor(disp_pos/2);
}


/*======================================================================*
                           is_current_console
*======================================================================*/
PUBLIC t_bool is_current_console(CONSOLE* p_con)
{
	return (p_con == &console_table[nr_current_console]);
}


/*======================================================================*
                            set_cursor
 *======================================================================*/
PRIVATE void set_cursor(unsigned int position)
{
	disable_int();
	out_byte(CRTC_ADDR_REG, CRTC_DATA_IDX_CURSOR_H);
	out_byte(CRTC_DATA_REG, (position >> 8) & 0xFF);
	out_byte(CRTC_ADDR_REG, CRTC_DATA_IDX_CURSOR_L);
	out_byte(CRTC_DATA_REG, position & 0xFF);
	enable_int();
}