2  *  linux/drivers/video/vgacon.c -- Low level VGA based console driver
16  *	Improved loadable font/UTF-8 support by H. Peter Anvin
17  *	Feb-Sep 1995 <peter.anvin@linux.org>
20  *	17-Jun-95 <sgt20@cam.ac.uk>
22  *	if 512 char mode is already enabled don't re-enable it,
24  *	5-May-96 <mitja.horvat@guest.arnes.si>
100 	 * Disabling scrollback is required for the Braillex ib80-piezo  in no_scroll()
102 	 * Use the "no-scroll" bootflag.  in no_scroll()
108 __setup("no-scroll", no_scroll);
114  * possibility that some pre-dinosaur hardware won't like the back to back
124 	 * handlers, thus the write has to be IRQ-atomic.  in write_vga()
136 	write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2);  in vga_set_mem_top()
141 	unsigned long scr_end = c->vc_scr_end - vga_vram_base;  in vgacon_scrolldelta()
142 	unsigned long vorigin = c->vc_visible_origin - vga_vram_base;  in vgacon_scrolldelta()
143 	unsigned long origin = c->vc_origin - vga_vram_base;  in vgacon_scrolldelta()
144 	int margin = c->vc_size_row * 4;  in vgacon_scrolldelta()
149 		c->vc_visible_origin = c->vc_origin;  in vgacon_scrolldelta()
156 		wrap = vga_rolled_over + c->vc_size_row;  in vgacon_scrolldelta()
162 	from_off = (vorigin - from + wrap) % wrap + lines * c->vc_size_row;  in vgacon_scrolldelta()
163 	avail = (origin - from + wrap) % wrap;  in vgacon_scrolldelta()
170 	if (from_off > avail - margin)  in vgacon_scrolldelta()
173 	c->vc_visible_origin = vga_vram_base + (from + from_off) % wrap;  in vgacon_scrolldelta()
180 	if (c->vc_origin != c->vc_visible_origin)  in vgacon_restore_screen()
191 	    vga_si->orig_video_isVGA == VIDEO_TYPE_VLFB ||  in vgacon_startup()
192 	    vga_si->orig_video_isVGA == VIDEO_TYPE_EFI) {  in vgacon_startup()
196 		return conswitchp->con_startup();  in vgacon_startup()
203 	if ((vga_si->orig_video_lines == 0) ||  in vgacon_startup()
204 	    (vga_si->orig_video_cols  == 0))  in vgacon_startup()
208 	if ((vga_si->orig_video_mode == 0x0D) ||	/* 320x200/4 */  in vgacon_startup()
209 	    (vga_si->orig_video_mode == 0x0E) ||	/* 640x200/4 */  in vgacon_startup()
210 	    (vga_si->orig_video_mode == 0x10) ||	/* 640x350/4 */  in vgacon_startup()
211 	    (vga_si->orig_video_mode == 0x12) ||	/* 640x480/4 */  in vgacon_startup()
212 	    (vga_si->orig_video_mode == 0x6A))	/* 800x600/4 (VESA) */  in vgacon_startup()
215 	vga_video_num_lines = vga_si->orig_video_lines;  in vgacon_startup()
216 	vga_video_num_columns = vga_si->orig_video_cols;  in vgacon_startup()
219 	if (vga_si->orig_video_mode == 7) {  in vgacon_startup()
220 		/* Monochrome display */  in vgacon_startup()
224 		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {  in vgacon_startup()
261 		if ((vga_si->orig_video_ega_bx & 0xff) != 0x10) {  in vgacon_startup()
266 			if (!vga_si->orig_video_isVGA) {  in vgacon_startup()
357 		vga_default_font_height = vga_si->orig_video_points;  in vgacon_startup()
358 		vga_video_font_height = vga_si->orig_video_points;  in vgacon_startup()
359 		/* This may be suboptimal but is a safe bet - go with it */  in vgacon_startup()
364 	vgacon_xres = vga_si->orig_video_cols * VGA_FONTWIDTH;  in vgacon_startup()
383 	c->vc_can_do_color = vga_can_do_color;  in vgacon_init()
384 	c->vc_scan_lines = vga_scan_lines;  in vgacon_init()
385 	c->vc_font.height = c->vc_cell_height = vga_video_font_height;  in vgacon_init()
389 		c->vc_cols = vga_video_num_columns;  in vgacon_init()
390 		c->vc_rows = vga_video_num_lines;  in vgacon_init()
394 	c->vc_complement_mask = 0x7700;  in vgacon_init()
396 		c->vc_hi_font_mask = 0x0800;  in vgacon_init()
397 	p = *c->uni_pagedict_loc;  in vgacon_init()
398 	if (c->uni_pagedict_loc != &vgacon_uni_pagedir) {  in vgacon_init()
400 		c->uni_pagedict_loc = &vgacon_uni_pagedir;  in vgacon_init()
407 	if (global_cursor_default == -1)  in vgacon_init()
409 			!(vga_si->flags & VIDEO_FLAGS_NOCURSOR);  in vgacon_init()
416 		c->vc_visible_origin = vga_vram_base;  in vgacon_deinit()
420 	if (!--vgacon_refcount)  in vgacon_deinit()
422 	c->uni_pagedict_loc = &c->uni_pagedict;  in vgacon_deinit()
435 			attr = (attr & 0xF0) | c->vc_itcolor;  in vgacon_build_attr()
437 			attr = (attr & 0xf0) | c->vc_ulcolor;  in vgacon_build_attr()
439 			attr = (attr & 0xf0) | c->vc_halfcolor;  in vgacon_build_attr()
464 	while (count--) {  in vgacon_invert_region()
510 	if (c->vc_mode != KD_TEXT)  in vgacon_cursor()
515 	c_height = c->vc_cell_height;  in vgacon_cursor()
517 	write_vga(14, (c->vc_pos - vga_vram_base) / 2);  in vgacon_cursor()
527 	switch (CUR_SIZE(c->vc_cursor_type)) {  in vgacon_cursor()
529 		vgacon_set_cursor_size(c_height - (c_height < 10 ? 2 : 3),  in vgacon_cursor()
530 				       c_height - (c_height < 10 ? 1 : 2));  in vgacon_cursor()
534 				       c_height - (c_height < 10 ? 1 : 2));  in vgacon_cursor()
538 				       c_height - (c_height < 10 ? 1 : 2));  in vgacon_cursor()
542 				       c_height - (c_height < 10 ? 1 : 2));  in vgacon_cursor()
560 	unsigned int scanlines = height * c->vc_cell_height;  in vgacon_doresize()
566 	vgacon_yres = height * c->vc_cell_height;  in vgacon_doresize()
580 		scanlines -= 1;  in vgacon_doresize()
599 	outb_p(width - 1, vga_video_port_val);  in vgacon_doresize()
619 	int x = c->vc_cols * VGA_FONTWIDTH;  in vgacon_switch()
620 	int y = c->vc_rows * c->vc_cell_height;  in vgacon_switch()
621 	int rows = vga_si->orig_video_lines * vga_default_font_height/  in vgacon_switch()  local
622 		c->vc_cell_height;  in vgacon_switch()
628 	vga_video_num_columns = c->vc_cols;  in vgacon_switch()
629 	vga_video_num_lines = c->vc_rows;  in vgacon_switch()
635 		scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,  in vgacon_switch()
636 			    c->vc_screenbuf_size > vga_vram_size ?  in vgacon_switch()
637 				vga_vram_size : c->vc_screenbuf_size);  in vgacon_switch()
641 		     vga_video_num_columns <= vga_si->orig_video_cols &&  in vgacon_switch()
642 		     vga_video_num_lines <= rows))  in vgacon_switch()
643 			vgacon_doresize(c, c->vc_cols, c->vc_rows);  in vgacon_switch()
656 		vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);  in vga_set_palette()
657 		vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);  in vga_set_palette()
658 		vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);  in vga_set_palette()
673 	unsigned char CrtCtrlIndex;	/* CRT-Contr. Index reg.  */
675 	unsigned char HorizontalTotal;	/* CRT-Controller:00h */
676 	unsigned char HorizDisplayEnd;	/* CRT-Controller:01h */
677 	unsigned char StartHorizRetrace;	/* CRT-Controller:04h */
678 	unsigned char EndHorizRetrace;	/* CRT-Controller:05h */
679 	unsigned char Overflow;	/* CRT-Controller:07h */
680 	unsigned char StartVertRetrace;	/* CRT-Controller:10h */
681 	unsigned char EndVertRetrace;	/* CRT-Controller:11h */
682 	unsigned char ModeControl;	/* CRT-Controller:17h */
683 	unsigned char ClockingMode;	/* Seq-Controller:01h */
691 		vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I);  in vga_vesa_blank()
693 		vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R);  in vga_vesa_blank()
712 		vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);  in vga_vesa_blank()
718 	vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20);  in vga_vesa_blank()
722 		vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF);  in vga_vesa_blank()
751 	vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);  in vga_vesa_blank()
760 	vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO);  in vga_vesa_unblank()
779 	vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode);  in vga_vesa_unblank()
782 	vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);  in vga_vesa_unblank()
791 	vga_w(state->vgabase, VGA_PEL_MSK, 0xff);  in vga_pal_blank()
793 		vga_w(state->vgabase, VGA_PEL_IW, i);  in vga_pal_blank()
794 		vga_w(state->vgabase, VGA_PEL_D, 0);  in vga_pal_blank()
795 		vga_w(state->vgabase, VGA_PEL_D, 0);  in vga_pal_blank()
796 		vga_w(state->vgabase, VGA_PEL_D, 0);  in vga_pal_blank()
825 			    c->vc_screenbuf_size);  in vgacon_blank()
831 			vga_vesa_blank(&vgastate, blank - 1);  in vgacon_blank()
876 		return -EINVAL;	/* Return to default font not supported */  in vgacon_do_font_op()
882 	vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);  in vgacon_do_font_op()
884 	vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04);	  in vgacon_do_font_op()
886 	vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07);	  in vgacon_do_font_op()
888 	vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);  in vgacon_do_font_op()
891 	vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02);		  in vgacon_do_font_op()
892 	/* disable odd-even addressing */  in vgacon_do_font_op()
893 	vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00);  in vgacon_do_font_op()
895 	vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00);  in vgacon_do_font_op()
911 		 * In 512-character mode, the character map is not contiguous if  in vgacon_do_font_op()
912 		 * we want to remain EGA compatible -- which we do  in vgacon_do_font_op()
933 	vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);	  in vgacon_do_font_op()
935 	vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03);  in vgacon_do_font_op()
936 	/* odd-even addressing */  in vgacon_do_font_op()
937 	vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03);  in vgacon_do_font_op()
940 		vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select);  in vgacon_do_font_op()
942 	vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);  in vgacon_do_font_op()
945 	vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00);  in vgacon_do_font_op()
946 	/* enable even-odd addressing */  in vgacon_do_font_op()
947 	vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10);  in vgacon_do_font_op()
949 	vga_wgfx(state->vgabase, VGA_GFX_MISC, beg);  in vgacon_do_font_op()
951 	/* if 512 char mode is already enabled don't re-enable it. */  in vgacon_do_font_op()
954 		/* 256-char: enable intensity bit  in vgacon_do_font_op()
955 		   512-char: disable intensity bit */  in vgacon_do_font_op()
956 		inb_p(video_port_status);	/* clear address flip-flop */  in vgacon_do_font_op()
958 		vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);  in vgacon_do_font_op()
962 		vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);	  in vgacon_do_font_op()
970 			if (c && c->vc_sw == &vga_con) {  in vgacon_do_font_op()
973 				c->vc_hi_font_mask = 0x00;  in vgacon_do_font_op()
975 				c->vc_hi_font_mask = ch512 ? 0x0800 : 0;  in vgacon_do_font_op()
988 	int rows, maxscan, i;  in vgacon_adjust_height()  local
990 	rows = vc->vc_scan_lines / fontheight;	/* Number of video rows we end up with */  in vgacon_adjust_height()
991 	maxscan = rows * fontheight - 1;	/* Scan lines to actually display-1 */  in vgacon_adjust_height()
996 	   be OK for EGA text modes in the range 257-512 scan lines, so I  in vgacon_adjust_height()
1000 	   registers; they are write-only on EGA, but it appears that they  in vgacon_adjust_height()
1010 	vde = maxscan & 0xff;	/* Vertical display end reg */  in vgacon_adjust_height()
1013 	fsr = (fsr & 0xe0) + (fontheight - 1);	/*  Font size register */  in vgacon_adjust_height()
1020 	outb_p(0x12, vga_video_port_reg);	/* Vertical display limit */  in vgacon_adjust_height()
1028 		if (c && c->vc_sw == &vga_con) {  in vgacon_adjust_height()
1033 				c->vc_sw->con_cursor(c, true);  in vgacon_adjust_height()
1035 			c->vc_font.height = c->vc_cell_height = fontheight;  in vgacon_adjust_height()
1036 			vc_resize(c, 0, rows);	/* Adjust console size */  in vgacon_adjust_height()
1045 	unsigned charcount = font->charcount;  in vgacon_font_set()
1049 		return -EINVAL;  in vgacon_font_set()
1051 	if (font->width != VGA_FONTWIDTH || font->height > 32 || vpitch != 32 ||  in vgacon_font_set()
1053 		return -EINVAL;  in vgacon_font_set()
1055 	rc = vgacon_do_font_op(&vgastate, font->data, 1, charcount == 512);  in vgacon_font_set()
1060 		rc = vgacon_adjust_height(c, font->height);  in vgacon_font_set()
1067 		return -EINVAL;  in vgacon_font_get()
1069 	font->width = VGA_FONTWIDTH;  in vgacon_font_get()
1070 	font->height = c->vc_font.height;  in vgacon_font_get()
1071 	font->charcount = vga_512_chars ? 512 : 256;  in vgacon_font_get()
1072 	if (!font->data)  in vgacon_font_get()
1074 	return vgacon_do_font_op(&vgastate, font->data, 0, vga_512_chars);  in vgacon_font_get()
1081 		return -EINVAL;  in vgacon_resize()
1088 		vga_si->orig_video_cols = width;  in vgacon_resize()
1089 		vga_si->orig_video_lines = height;  in vgacon_resize()
1090 		vga_default_font_height = c->vc_cell_height;  in vgacon_resize()
1093 	if (width % 2 || width > vga_si->orig_video_cols ||  in vgacon_resize()
1094 	    height > (vga_si->orig_video_lines * vga_default_font_height)/  in vgacon_resize()
1095 	    c->vc_cell_height)  in vgacon_resize()
1096 		return -EINVAL;  in vgacon_resize()
1108 	c->vc_origin = c->vc_visible_origin = vga_vram_base;  in vgacon_set_origin()
1124 		c->state.x = vga_si->orig_x;  in vgacon_save_screen()
1125 		c->state.y = vga_si->orig_y;  in vgacon_save_screen()
1132 		scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,  in vgacon_save_screen()
1133 			    c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);  in vgacon_save_screen()
1142 	if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT)  in vgacon_scroll()
1145 	if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2)  in vgacon_scroll()
1149 	oldo = c->vc_origin;  in vgacon_scroll()
1150 	delta = lines * c->vc_size_row;  in vgacon_scroll()
1152 		if (c->vc_scr_end + delta >= vga_vram_end) {  in vgacon_scroll()
1155 				    c->vc_screenbuf_size - delta);  in vgacon_scroll()
1156 			c->vc_origin = vga_vram_base;  in vgacon_scroll()
1157 			vga_rolled_over = oldo - vga_vram_base;  in vgacon_scroll()
1159 			c->vc_origin += delta;  in vgacon_scroll()
1160 		scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size -  in vgacon_scroll()
1161 				     delta), c->vc_video_erase_char,  in vgacon_scroll()
1164 		if (oldo - delta < vga_vram_base) {  in vgacon_scroll()
1165 			scr_memmovew((u16 *) (vga_vram_end -  in vgacon_scroll()
1166 					      c->vc_screenbuf_size +  in vgacon_scroll()
1168 				     c->vc_screenbuf_size - delta);  in vgacon_scroll()
1169 			c->vc_origin = vga_vram_end - c->vc_screenbuf_size;  in vgacon_scroll()
1172 			c->vc_origin -= delta;  in vgacon_scroll()
1173 		c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;  in vgacon_scroll()
1174 		scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char,  in vgacon_scroll()
1177 	c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;  in vgacon_scroll()
1178 	c->vc_visible_origin = c->vc_origin;  in vgacon_scroll()
1180 	c->vc_pos = (c->vc_pos - oldo) + c->vc_origin;  in vgacon_scroll()