console.c

LINUX1.0内核源代码,学习LINUX编程的一定要看。

	tab_stop[4]	= 0x01010101;

	if (do_clear) {
		gotoxy(currcons,0,0);
		csi_J(currcons,2);
		save_cur(currcons);
	}
}

void con_write(struct tty_struct * tty)
{
	int c;
	unsigned int currcons;

	currcons = tty->line - 1;
	if (currcons >= NR_CONSOLES) {
		printk("con_write: illegal tty (%d)\n", currcons);
		return;
	}
#ifdef CONFIG_SELECTION
	/* clear the selection as soon as any characters are to be written
	   out on the console holding the selection. */
	if (!EMPTY(&tty->write_q) && currcons == sel_cons)
		clear_selection();
#endif /* CONFIG_SELECTION */
	disable_bh(KEYBOARD_BH);
	while (!tty->stopped &&	(c = get_tty_queue(&tty->write_q)) >= 0) {
		if (state == ESnormal && translate[c]) {
			if (need_wrap) {
				cr(currcons);
				lf(currcons);
			}
			if (decim)
				insert_char(currcons);
			c = translate[c];
			*(unsigned short *) pos = (attr << 8) + c;
			if (x == video_num_columns - 1)
				need_wrap = decawm;
			else {
				x++;
				pos+=2;
			}
			continue;
		}

		/*
		 *  Control characters can be used in the _middle_
		 *  of an escape sequence.
		 */
		switch (c) {
			case 7:
				kd_mksound(0x637, HZ/8);
				continue;
			case 8:
				bs(currcons);
				continue;
			case 9:
				pos -= (x << 1);
				while (x < video_num_columns - 1) {
					x++;
					if (tab_stop[x >> 5] & (1 << (x & 31)))
						break;
				}
				pos += (x << 1);
				continue;
			case 10: case 11: case 12:
				lf(currcons);
				if (!is_kbd(lnm))
					continue;
			case 13:
				cr(currcons);
				continue;
			case 14:
				charset = 1;
				translate = G1_charset;
				continue;
			case 15:
				charset = 0;
				translate = G0_charset;
				continue;
			case 24: case 26:
				state = ESnormal;
				continue;
			case 27:
				state = ESesc;
				continue;
			case 127:
				del(currcons);
				continue;
			case 128+27:
				state = ESsquare;
				continue;
		}
		switch(state) {
			case ESesc:
				state = ESnormal;
				switch (c) {
				  case '[':
					state = ESsquare;
					continue;
				  case 'E':
					cr(currcons);
					lf(currcons);
					continue;
				  case 'M':
					ri(currcons);
					continue;
				  case 'D':
					lf(currcons);
					continue;
				  case 'H':
					tab_stop[x >> 5] |= (1 << (x & 31));
					continue;
				  case 'Z':
					respond_ID(currcons,tty);
					continue;
				  case '7':
					save_cur(currcons);
					continue;
				  case '8':
					restore_cur(currcons);
					continue;
				  case '(':
					state = ESsetG0;
					continue;
				  case ')':
					state = ESsetG1;
					continue;
				  case '#':
					state = EShash;
					continue;
				  case 'c':
					reset_terminal(currcons,1);
					continue;
				  case '>':  /* Numeric keypad */
					clr_kbd(kbdapplic);
					continue;
				  case '=':  /* Appl. keypad */
					set_kbd(kbdapplic);
				 	continue;
				}	
				continue;
			case ESsquare:
				for(npar = 0 ; npar < NPAR ; npar++)
					par[npar] = 0;
				npar = 0;
				state = ESgetpars;
				if (c == '[') { /* Function key */
					state=ESfunckey;
					continue;
				}
				ques = (c=='?');
				if (ques)
					continue;
			case ESgetpars:
				if (c==';' && npar<NPAR-1) {
					npar++;
					continue;
				} else if (c>='0' && c<='9') {
					par[npar] *= 10;
					par[npar] += c-'0';
					continue;
				} else state=ESgotpars;
			case ESgotpars:
				state = ESnormal;
				switch(c) {
					case 'h':
						set_mode(currcons,1);
						continue;
					case 'l':
						set_mode(currcons,0);
						continue;
					case 'n':
						if (!ques)
							if (par[0] == 5)
								status_report(currcons,tty);
							else if (par[0] == 6)
								cursor_report(currcons,tty);
						continue;
				}
				if (ques) {
					ques = 0;
					continue;
				}
				switch(c) {
					case 'G': case '`':
						if (par[0]) par[0]--;
						gotoxy(currcons,par[0],y);
						continue;
					case 'A':
						if (!par[0]) par[0]++;
						gotoxy(currcons,x,y-par[0]);
						continue;
					case 'B': case 'e':
						if (!par[0]) par[0]++;
						gotoxy(currcons,x,y+par[0]);
						continue;
					case 'C': case 'a':
						if (!par[0]) par[0]++;
						gotoxy(currcons,x+par[0],y);
						continue;
					case 'D':
						if (!par[0]) par[0]++;
						gotoxy(currcons,x-par[0],y);
						continue;
					case 'E':
						if (!par[0]) par[0]++;
						gotoxy(currcons,0,y+par[0]);
						continue;
					case 'F':
						if (!par[0]) par[0]++;
						gotoxy(currcons,0,y-par[0]);
						continue;
					case 'd':
						if (par[0]) par[0]--;
						gotoxy(currcons,x,par[0]);
						continue;
					case 'H': case 'f':
						if (par[0]) par[0]--;
						if (par[1]) par[1]--;
						gotoxy(currcons,par[1],par[0]);
						continue;
					case 'J':
						csi_J(currcons,par[0]);
						continue;
					case 'K':
						csi_K(currcons,par[0]);
						continue;
					case 'L':
						csi_L(currcons,par[0]);
						continue;
					case 'M':
						csi_M(currcons,par[0]);
						continue;
					case 'P':
						csi_P(currcons,par[0]);
						continue;
					case 'c':
						if (!par[0])
							respond_ID(currcons,tty);
						continue;
					case 'g':
						if (!par[0])
							tab_stop[x >> 5] &= ~(1 << (x & 31));
						else if (par[0] == 3) {
							tab_stop[0] =
							tab_stop[1] =
							tab_stop[2] =
							tab_stop[3] =
							tab_stop[4] = 0;
						}
						continue;
					case 'm':
						csi_m(currcons);
						continue;
					case 'r':
						if (!par[0])
							par[0]++;
						if (!par[1])
							par[1] = video_num_lines;
						/* Minimum allowed region is 2 lines */
						if (par[0] < par[1] &&
						    par[1] <= video_num_lines) {
							top=par[0]-1;
							bottom=par[1];
							gotoxy(currcons,0,0);
						}
						continue;
					case 's':
						save_cur(currcons);
						continue;
					case 'u':
						restore_cur(currcons);
						continue;
					case '@':
						csi_at(currcons,par[0]);
						continue;
					case ']': /* setterm functions */
						setterm_command(currcons);
						continue;
				}
				continue;
			case ESfunckey:
				state = ESnormal;
				continue;
			case EShash:
				state = ESnormal;
				if (c == '8') {
					/* DEC screen alignment test. kludge :-) */
					video_erase_char =
						(video_erase_char & 0xff00) | 'E';
					csi_J(currcons, 2);
					video_erase_char =
						(video_erase_char & 0xff00) | ' ';
				}
				continue;
			case ESsetG0:
				if (c == '0')
					G0_charset = GRAF_TRANS;
				else if (c == 'B')
					G0_charset = NORM_TRANS;
				else if (c == 'U')
					G0_charset = NULL_TRANS;
				else if (c == 'K')
					G0_charset = USER_TRANS;
				if (charset == 0)
					translate = G0_charset;
				state = ESnormal;
				continue;
			case ESsetG1:
				if (c == '0')
					G1_charset = GRAF_TRANS;
				else if (c == 'B')
					G1_charset = NORM_TRANS;
				else if (c == 'U')
					G1_charset = NULL_TRANS;
				else if (c == 'K')
					G1_charset = USER_TRANS;
				if (charset == 1)
					translate = G1_charset;
				state = ESnormal;
				continue;
			default:
				state = ESnormal;
		}
	}
	if (vcmode != KD_GRAPHICS)
		set_cursor(currcons);
	enable_bh(KEYBOARD_BH);
	if (LEFT(&tty->write_q) > WAKEUP_CHARS)
		wake_up_interruptible(&tty->write_q.proc_list);
}

void do_keyboard_interrupt(void)
{
	TTY_READ_FLUSH(TTY_TABLE(0));
	timer_active &= ~(1<<BLANK_TIMER);
	if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
		return;
	if (console_blanked) {
		timer_table[BLANK_TIMER].expires = 0;
		timer_active |= 1<<BLANK_TIMER;
	} else if (blankinterval) {
		timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
		timer_active |= 1<<BLANK_TIMER;
	}
}

void * memsetw(void * s,unsigned short c,int count)
{
__asm__("cld\n\t"
	"rep\n\t"
	"stosw"
	: /* no output */
	:"a" (c),"D" (s),"c" (count)
	:"cx","di");
return s;
}

void console_print(const char * b)
{
	int currcons = fg_console;
	unsigned char c;

	if (!printable || currcons<0 || currcons>=NR_CONSOLES)
		return;
	while ((c = *(b++)) != 0) {
		if (c == 10 || c == 13 || need_wrap) {
			if (c != 13)
				lf(currcons);
			cr(currcons);
			if (c == 10 || c == 13)
				continue;
		}
		*(unsigned short *) pos = (attr << 8) + c;
		if (x == video_num_columns - 1) {
			need_wrap = 1;
			continue;
		}
		x++;
		pos+=2;
	}
	set_cursor(currcons);
	if (vt_cons[fg_console].vc_mode == KD_GRAPHICS)
		return;
	timer_active &= ~(1<<BLANK_TIMER);
	if (console_blanked) {
		timer_table[BLANK_TIMER].expires = 0;
		timer_active |= 1<<BLANK_TIMER;
	} else if (blankinterval) {
		timer_table[BLANK_TIMER].expires = jiffies + blankinterval;
		timer_active |= 1<<BLANK_TIMER;
	}
}

/*
 *  long con_init(long);
 *
 * This routine initalizes console interrupts, and does nothing
 * else. If you want the screen to clear, call tty_write with
 * the appropriate escape-sequece.
 *
 * Reads the information preserved by setup.s to determine the current display
 * type and sets everything accordingly.
 */
long con_init(long kmem_start)
{
	char *display_desc = "????";
	int currcons = 0;
	long base;
	int orig_x = ORIG_X;
	int orig_y = ORIG_Y;

	vc_scrmembuf = (unsigned short *) kmem_start;
	video_num_columns = ORIG_VIDEO_COLS;
	video_size_row = video_num_columns * 2;
	video_num_lines = ORIG_VIDEO_LINES;
	video_page = ORIG_VIDEO_PAGE;
	screen_size = (video_num_lines * video_size_row);
	kmem_start += NR_CONSOLES * screen_size;
	timer_table[BLANK_TIMER].fn = blank_screen;
	timer_table[BLANK_TIMER].expires = 0;
	if (blankinterval) {
		timer_table[BLANK_TIMER].expires = jiffies+blankinterval;
		timer_active |= 1<<BLANK_TIMER;
	}
	
	if (ORIG_VIDEO_MODE == 7)	/* Is this a monochrome display? */
	{
		video_mem_base = 0xb0000;
		video_port_reg = 0x3b4;
		video_port_val = 0x3b5;
		if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
		{
			video_type = VIDEO_TYPE_EGAM;
			video_mem_term = 0xb8000;
			display_desc = "EGA+";
		}
		else
		{
			video_type = VIDEO_TYPE_MDA;
			video_mem_term = 0xb2000;
			display_desc = "*MDA";
		}
	}
	else				/* If not, it is color. */
	{
		can_do_color = 1;
		video_mem_base = 0xb8000;
		video_port_reg	= 0x3d4;
		video_port_val	= 0x3d5;
		if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10)
		{
			video_type = VIDEO_TYPE_EGAC;
			video_mem_term = 0xc0000;
			display_desc = "EGA+";
		}
		else
		{
			video_type = VIDEO_TYPE_CGA;
			video_mem_term = 0xba000;
			display_desc = "*CGA";
		}
	}
	
	/* Initialize the variables used for scrolling (mostly EGA/VGA)	*/

	base = (long)vc_scrmembuf;
	for (currcons = 0; currcons<NR_CONSOLES; currcons++) {
		pos = origin = video_mem_start = base;
		scr_end = video_mem_end = (base += screen_size);
		vc_scrbuf[currcons] = (unsigned short *) origin;
		vcmode		= KD_TEXT;
		vtmode.mode	= VT_AUTO;
		vtmode.waitv	= 0;
		vtmode.relsig	= 0;
		vtmode.acqsig	= 0;
		vtmode.frsig	= 0;
		vtpid		= -1;
		vtnewvt		= -1;
		clr_kbd(kbdraw);
		def_color	= 0x07;   /* white */
		ulcolor		= 0x0f;   /* bold white */
		halfcolor	= 0x08;   /* grey */
		reset_terminal(currcons, currcons);
	}
	currcons = fg_console = 0;

	video_mem_start = video_mem_base;
	video_mem_end = video_mem_term;
	origin = video_mem_start;
	scr_end	= video_mem_start + video_num_lines * video_size_row;