2 * linux/drivers/video/vgacon.c -- Low level VGA based console driver
4 * Created 28 Sep 1997 by Geert Uytterhoeven
6 * Rewritten by Martin Mares <mj@ucw.cz>, July 1998
8 * This file is based on the old console.c, vga.c and vesa_blank.c drivers.
10 * Copyright (C) 1991, 1992 Linus Torvalds
13 * User definable mapping table and font loading by Eugene G. Crosser,
14 * <crosser@average.org>
16 * Improved loadable font/UTF-8 support by H. Peter Anvin
17 * Feb-Sep 1995 <peter.anvin@linux.org>
19 * Colour palette handling, by Simon Tatham
20 * 17-Jun-95 <sgt20@cam.ac.uk>
22 * if 512 char mode is already enabled don't re-enable it,
23 * because it causes screen to flicker, by Mitja Horvat
24 * 5-May-96 <mitja.horvat@guest.arnes.si>
26 * Use 2 outw instead of 4 outb_p to reduce erroneous text
27 * flashing on RHS of screen during heavy console scrolling .
28 * Oct 1996, Paul Gortmaker.
31 * This file is subject to the terms and conditions of the GNU General Public
32 * License. See the file COPYING in the main directory of this archive for
36 #include <linux/module.h>
37 #include <linux/types.h>
39 #include <linux/kernel.h>
40 #include <linux/console.h>
41 #include <linux/string.h>
43 #include <linux/slab.h>
44 #include <linux/vt_kern.h>
45 #include <linux/sched.h>
46 #include <linux/selection.h>
47 #include <linux/spinlock.h>
48 #include <linux/ioport.h>
49 #include <linux/init.h>
50 #include <linux/screen_info.h>
51 #include <video/vga.h>
54 static DEFINE_RAW_SPINLOCK(vga_lock);
55 static int cursor_size_lastfrom;
56 static int cursor_size_lastto;
57 static u32 vgacon_xres;
58 static u32 vgacon_yres;
59 static struct vgastate vgastate;
63 #define VGA_FONTWIDTH 8 /* VGA does not support fontwidths != 8 */
65 * Interface used by the world
68 static const char *vgacon_startup(void);
69 static void vgacon_init(struct vc_data *c, int init);
70 static void vgacon_deinit(struct vc_data *c);
71 static void vgacon_cursor(struct vc_data *c, int mode);
72 static int vgacon_switch(struct vc_data *c);
73 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch);
74 static void vgacon_scrolldelta(struct vc_data *c, int lines);
75 static int vgacon_set_origin(struct vc_data *c);
76 static void vgacon_save_screen(struct vc_data *c);
77 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count);
78 static struct uni_pagedir *vgacon_uni_pagedir;
79 static int vgacon_refcount;
81 /* Description of the hardware situation */
82 static unsigned long vga_vram_base __read_mostly; /* Base of video memory */
83 static unsigned long vga_vram_end __read_mostly; /* End of video memory */
84 static unsigned int vga_vram_size __read_mostly; /* Size of video memory */
85 static u16 vga_video_port_reg __read_mostly; /* Video register select port */
86 static u16 vga_video_port_val __read_mostly; /* Video register value port */
87 static unsigned int vga_video_num_columns; /* Number of text columns */
88 static unsigned int vga_video_num_lines; /* Number of text lines */
89 static bool vga_can_do_color; /* Do we support colors? */
90 static unsigned int vga_default_font_height __read_mostly; /* Height of default screen font */
91 static unsigned char vga_video_type __read_mostly; /* Card type */
92 static int vga_vesa_blanked;
93 static bool vga_palette_blanked;
94 static bool vga_is_gfx;
95 static bool vga_512_chars;
96 static int vga_video_font_height;
97 static int vga_scan_lines __read_mostly;
98 static unsigned int vga_rolled_over; /* last vc_origin offset before wrap */
100 static bool vgacon_text_mode_force;
101 static bool vga_hardscroll_enabled;
102 static bool vga_hardscroll_user_enable = true;
104 bool vgacon_text_force(void)
106 return vgacon_text_mode_force;
108 EXPORT_SYMBOL(vgacon_text_force);
110 static int __init text_mode(char *str)
112 vgacon_text_mode_force = true;
114 pr_warn("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
115 pr_warn("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
116 pr_warn("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
121 /* force text mode - used by kernel modesetting */
122 __setup("nomodeset", text_mode);
124 static int __init no_scroll(char *str)
127 * Disabling scrollback is required for the Braillex ib80-piezo
128 * Braille reader made by F.H. Papenmeier (Germany).
129 * Use the "no-scroll" bootflag.
131 vga_hardscroll_user_enable = vga_hardscroll_enabled = false;
135 __setup("no-scroll", no_scroll);
138 * By replacing the four outb_p with two back to back outw, we can reduce
139 * the window of opportunity to see text mislocated to the RHS of the
140 * console during heavy scrolling activity. However there is the remote
141 * possibility that some pre-dinosaur hardware won't like the back to back
142 * I/O. Since the Xservers get away with it, we should be able to as well.
144 static inline void write_vga(unsigned char reg, unsigned int val)
150 * ddprintk might set the console position from interrupt
151 * handlers, thus the write has to be IRQ-atomic.
153 raw_spin_lock_irqsave(&vga_lock, flags);
154 v1 = reg + (val & 0xff00);
155 v2 = reg + 1 + ((val << 8) & 0xff00);
156 outw(v1, vga_video_port_reg);
157 outw(v2, vga_video_port_reg);
158 raw_spin_unlock_irqrestore(&vga_lock, flags);
161 static inline void vga_set_mem_top(struct vc_data *c)
163 write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2);
166 static void vgacon_restore_screen(struct vc_data *c)
168 if (c->vc_origin != c->vc_visible_origin)
169 vgacon_scrolldelta(c, 0);
172 static void vgacon_scrolldelta(struct vc_data *c, int lines)
174 vc_scrolldelta_helper(c, lines, vga_rolled_over, (void *)vga_vram_base,
179 static const char *vgacon_startup(void)
181 const char *display_desc = NULL;
185 if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
186 screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
188 #ifdef CONFIG_DUMMY_CONSOLE
189 conswitchp = &dummy_con;
190 return conswitchp->con_startup();
196 /* boot_params.screen_info reasonably initialized? */
197 if ((screen_info.orig_video_lines == 0) ||
198 (screen_info.orig_video_cols == 0))
201 /* VGA16 modes are not handled by VGACON */
202 if ((screen_info.orig_video_mode == 0x0D) || /* 320x200/4 */
203 (screen_info.orig_video_mode == 0x0E) || /* 640x200/4 */
204 (screen_info.orig_video_mode == 0x10) || /* 640x350/4 */
205 (screen_info.orig_video_mode == 0x12) || /* 640x480/4 */
206 (screen_info.orig_video_mode == 0x6A)) /* 800x600/4 (VESA) */
209 vga_video_num_lines = screen_info.orig_video_lines;
210 vga_video_num_columns = screen_info.orig_video_cols;
211 vgastate.vgabase = NULL;
213 if (screen_info.orig_video_mode == 7) {
214 /* Monochrome display */
215 vga_vram_base = 0xb0000;
216 vga_video_port_reg = VGA_CRT_IM;
217 vga_video_port_val = VGA_CRT_DM;
218 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
219 static struct resource ega_console_resource =
221 .flags = IORESOURCE_IO,
224 vga_video_type = VIDEO_TYPE_EGAM;
225 vga_vram_size = 0x8000;
226 display_desc = "EGA+";
227 request_resource(&ioport_resource,
228 &ega_console_resource);
230 static struct resource mda1_console_resource =
232 .flags = IORESOURCE_IO,
235 static struct resource mda2_console_resource =
237 .flags = IORESOURCE_IO,
240 vga_video_type = VIDEO_TYPE_MDA;
241 vga_vram_size = 0x2000;
242 display_desc = "*MDA";
243 request_resource(&ioport_resource,
244 &mda1_console_resource);
245 request_resource(&ioport_resource,
246 &mda2_console_resource);
247 vga_video_font_height = 14;
250 /* If not, it is color. */
251 vga_can_do_color = true;
252 vga_vram_base = 0xb8000;
253 vga_video_port_reg = VGA_CRT_IC;
254 vga_video_port_val = VGA_CRT_DC;
255 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
258 vga_vram_size = 0x8000;
260 if (!screen_info.orig_video_isVGA) {
261 static struct resource ega_console_resource =
263 .flags = IORESOURCE_IO,
266 vga_video_type = VIDEO_TYPE_EGAC;
267 display_desc = "EGA";
268 request_resource(&ioport_resource,
269 &ega_console_resource);
271 static struct resource vga_console_resource =
273 .flags = IORESOURCE_IO,
276 vga_video_type = VIDEO_TYPE_VGAC;
277 display_desc = "VGA+";
278 request_resource(&ioport_resource,
279 &vga_console_resource);
282 * Normalise the palette registers, to point
283 * the 16 screen colours to the first 16
287 for (i = 0; i < 16; i++) {
289 outb_p(i, VGA_ATT_W);
290 outb_p(i, VGA_ATT_W);
292 outb_p(0x20, VGA_ATT_W);
295 * Now set the DAC registers back to their
298 for (i = 0; i < 16; i++) {
299 outb_p(color_table[i], VGA_PEL_IW);
300 outb_p(default_red[i], VGA_PEL_D);
301 outb_p(default_grn[i], VGA_PEL_D);
302 outb_p(default_blu[i], VGA_PEL_D);
306 static struct resource cga_console_resource =
308 .flags = IORESOURCE_IO,
311 vga_video_type = VIDEO_TYPE_CGA;
312 vga_vram_size = 0x2000;
313 display_desc = "*CGA";
314 request_resource(&ioport_resource,
315 &cga_console_resource);
316 vga_video_font_height = 8;
320 vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size);
321 vga_vram_end = vga_vram_base + vga_vram_size;
324 * Find out if there is a graphics card present.
325 * Are there smarter methods around?
327 p = (volatile u16 *) vga_vram_base;
328 saved1 = scr_readw(p);
329 saved2 = scr_readw(p + 1);
330 scr_writew(0xAA55, p);
331 scr_writew(0x55AA, p + 1);
332 if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) {
333 scr_writew(saved1, p);
334 scr_writew(saved2, p + 1);
337 scr_writew(0x55AA, p);
338 scr_writew(0xAA55, p + 1);
339 if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) {
340 scr_writew(saved1, p);
341 scr_writew(saved2, p + 1);
344 scr_writew(saved1, p);
345 scr_writew(saved2, p + 1);
347 if (vga_video_type == VIDEO_TYPE_EGAC
348 || vga_video_type == VIDEO_TYPE_VGAC
349 || vga_video_type == VIDEO_TYPE_EGAM) {
350 vga_hardscroll_enabled = vga_hardscroll_user_enable;
351 vga_default_font_height = screen_info.orig_video_points;
352 vga_video_font_height = screen_info.orig_video_points;
353 /* This may be suboptimal but is a safe bet - go with it */
355 vga_video_font_height * vga_video_num_lines;
358 vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
359 vgacon_yres = vga_scan_lines;
364 static void vgacon_init(struct vc_data *c, int init)
366 struct uni_pagedir *p;
369 * We cannot be loaded as a module, therefore init is always 1,
370 * but vgacon_init can be called more than once, and init will
373 c->vc_can_do_color = vga_can_do_color;
375 /* set dimensions manually if init != 0 since vc_resize() will fail */
377 c->vc_cols = vga_video_num_columns;
378 c->vc_rows = vga_video_num_lines;
380 vc_resize(c, vga_video_num_columns, vga_video_num_lines);
382 c->vc_scan_lines = vga_scan_lines;
383 c->vc_font.height = c->vc_cell_height = vga_video_font_height;
384 c->vc_complement_mask = 0x7700;
386 c->vc_hi_font_mask = 0x0800;
387 p = *c->vc_uni_pagedir_loc;
388 if (c->vc_uni_pagedir_loc != &vgacon_uni_pagedir) {
390 c->vc_uni_pagedir_loc = &vgacon_uni_pagedir;
393 if (!vgacon_uni_pagedir && p)
394 con_set_default_unimap(c);
396 /* Only set the default if the user didn't deliberately override it */
397 if (global_cursor_default == -1)
398 global_cursor_default =
399 !(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
402 static void vgacon_deinit(struct vc_data *c)
404 /* When closing the active console, reset video origin */
405 if (con_is_visible(c)) {
406 c->vc_visible_origin = vga_vram_base;
410 if (!--vgacon_refcount)
412 c->vc_uni_pagedir_loc = &c->vc_uni_pagedir;
413 con_set_default_unimap(c);
416 static u8 vgacon_build_attr(struct vc_data *c, u8 color,
417 enum vc_intensity intensity,
418 bool blink, bool underline, bool reverse,
423 if (vga_can_do_color) {
425 attr = (attr & 0xF0) | c->vc_itcolor;
427 attr = (attr & 0xf0) | c->vc_ulcolor;
428 else if (intensity == VCI_HALF_BRIGHT)
429 attr = (attr & 0xf0) | c->vc_halfcolor;
433 ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) &
437 if (intensity == VCI_BOLD)
439 if (!vga_can_do_color) {
441 attr = (attr & 0xF8) | 0x02;
443 attr = (attr & 0xf8) | 0x01;
444 else if (intensity == VCI_HALF_BRIGHT)
445 attr = (attr & 0xf0) | 0x08;
450 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count)
452 const bool col = vga_can_do_color;
455 u16 a = scr_readw(p);
457 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
458 (((a) & 0x0700) << 4);
460 a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;
465 static void vgacon_set_cursor_size(int xpos, int from, int to)
470 if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto))
472 cursor_size_lastfrom = from;
473 cursor_size_lastto = to;
475 raw_spin_lock_irqsave(&vga_lock, flags);
476 if (vga_video_type >= VIDEO_TYPE_VGAC) {
477 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
478 curs = inb_p(vga_video_port_val);
479 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
480 cure = inb_p(vga_video_port_val);
486 curs = (curs & 0xc0) | from;
487 cure = (cure & 0xe0) | to;
489 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
490 outb_p(curs, vga_video_port_val);
491 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
492 outb_p(cure, vga_video_port_val);
493 raw_spin_unlock_irqrestore(&vga_lock, flags);
496 static void vgacon_cursor(struct vc_data *c, int mode)
498 if (c->vc_mode != KD_TEXT)
501 vgacon_restore_screen(c);
505 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
506 if (vga_video_type >= VIDEO_TYPE_VGAC)
507 vgacon_set_cursor_size(c->state.x, 31, 30);
509 vgacon_set_cursor_size(c->state.x, 31, 31);
514 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
515 switch (CUR_SIZE(c->vc_cursor_type)) {
517 vgacon_set_cursor_size(c->state.x,
526 vgacon_set_cursor_size(c->state.x,
527 c->vc_cell_height / 3,
532 case CUR_LOWER_THIRD:
533 vgacon_set_cursor_size(c->state.x,
534 (c->vc_cell_height * 2) / 3,
540 vgacon_set_cursor_size(c->state.x,
541 c->vc_cell_height / 2,
547 if (vga_video_type >= VIDEO_TYPE_VGAC)
548 vgacon_set_cursor_size(c->state.x, 31, 30);
550 vgacon_set_cursor_size(c->state.x, 31, 31);
553 vgacon_set_cursor_size(c->state.x, 1,
561 static int vgacon_doresize(struct vc_data *c,
562 unsigned int width, unsigned int height)
565 unsigned int scanlines = height * c->vc_cell_height;
566 u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan;
568 raw_spin_lock_irqsave(&vga_lock, flags);
570 vgacon_xres = width * VGA_FONTWIDTH;
571 vgacon_yres = height * c->vc_cell_height;
572 if (vga_video_type >= VIDEO_TYPE_VGAC) {
573 outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
574 max_scan = inb_p(vga_video_port_val);
579 outb_p(VGA_CRTC_MODE, vga_video_port_reg);
580 mode = inb_p(vga_video_port_val);
586 scanlines_lo = scanlines & 0xff;
588 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
589 r7 = inb_p(vga_video_port_val) & ~0x42;
591 if (scanlines & 0x100)
593 if (scanlines & 0x200)
596 /* deprotect registers */
597 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
598 vsync_end = inb_p(vga_video_port_val);
599 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
600 outb_p(vsync_end & ~0x80, vga_video_port_val);
603 outb_p(VGA_CRTC_H_DISP, vga_video_port_reg);
604 outb_p(width - 1, vga_video_port_val);
605 outb_p(VGA_CRTC_OFFSET, vga_video_port_reg);
606 outb_p(width >> 1, vga_video_port_val);
608 if (vga_video_type >= VIDEO_TYPE_VGAC) {
609 outb_p(VGA_CRTC_V_DISP_END, vga_video_port_reg);
610 outb_p(scanlines_lo, vga_video_port_val);
611 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
612 outb_p(r7,vga_video_port_val);
614 /* reprotect registers */
615 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
616 outb_p(vsync_end, vga_video_port_val);
619 raw_spin_unlock_irqrestore(&vga_lock, flags);
623 static int vgacon_switch(struct vc_data *c)
625 int x = c->vc_cols * VGA_FONTWIDTH;
626 int y = c->vc_rows * c->vc_cell_height;
627 int rows = screen_info.orig_video_lines * vga_default_font_height/
630 * We need to save screen size here as it's the only way
631 * we can spot the screen has been resized and we need to
632 * set size of freshly allocated screens ourselves.
634 vga_video_num_columns = c->vc_cols;
635 vga_video_num_lines = c->vc_rows;
637 /* We can only copy out the size of the video buffer here,
638 * otherwise we get into VGA BIOS */
641 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
642 c->vc_screenbuf_size > vga_vram_size ?
643 vga_vram_size : c->vc_screenbuf_size);
645 if ((vgacon_xres != x || vgacon_yres != y) &&
646 (!(vga_video_num_columns % 2) &&
647 vga_video_num_columns <= screen_info.orig_video_cols &&
648 vga_video_num_lines <= rows))
649 vgacon_doresize(c, c->vc_cols, c->vc_rows);
652 return 0; /* Redrawing not needed */
655 static void vga_set_palette(struct vc_data *vc, const unsigned char *table)
659 vga_w(vgastate.vgabase, VGA_PEL_MSK, 0xff);
660 for (i = j = 0; i < 16; i++) {
661 vga_w(vgastate.vgabase, VGA_PEL_IW, table[i]);
662 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
663 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
664 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
668 static void vgacon_set_palette(struct vc_data *vc, const unsigned char *table)
670 if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked
671 || !con_is_visible(vc))
673 vga_set_palette(vc, table);
676 /* structure holding original VGA register settings */
678 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
679 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
680 unsigned char CrtMiscIO; /* Miscellaneous register */
681 unsigned char HorizontalTotal; /* CRT-Controller:00h */
682 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
683 unsigned char StartHorizRetrace; /* CRT-Controller:04h */
684 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
685 unsigned char Overflow; /* CRT-Controller:07h */
686 unsigned char StartVertRetrace; /* CRT-Controller:10h */
687 unsigned char EndVertRetrace; /* CRT-Controller:11h */
688 unsigned char ModeControl; /* CRT-Controller:17h */
689 unsigned char ClockingMode; /* Seq-Controller:01h */
692 static void vga_vesa_blank(struct vgastate *state, int mode)
694 /* save original values of VGA controller registers */
695 if (!vga_vesa_blanked) {
696 raw_spin_lock_irq(&vga_lock);
697 vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I);
698 vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg);
699 vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R);
700 raw_spin_unlock_irq(&vga_lock);
702 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
703 vga_state.HorizontalTotal = inb_p(vga_video_port_val);
704 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
705 vga_state.HorizDisplayEnd = inb_p(vga_video_port_val);
706 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
707 vga_state.StartHorizRetrace = inb_p(vga_video_port_val);
708 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
709 vga_state.EndHorizRetrace = inb_p(vga_video_port_val);
710 outb_p(0x07, vga_video_port_reg); /* Overflow */
711 vga_state.Overflow = inb_p(vga_video_port_val);
712 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
713 vga_state.StartVertRetrace = inb_p(vga_video_port_val);
714 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
715 vga_state.EndVertRetrace = inb_p(vga_video_port_val);
716 outb_p(0x17, vga_video_port_reg); /* ModeControl */
717 vga_state.ModeControl = inb_p(vga_video_port_val);
718 vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
721 /* assure that video is enabled */
722 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
723 raw_spin_lock_irq(&vga_lock);
724 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20);
726 /* test for vertical retrace in process.... */
727 if ((vga_state.CrtMiscIO & 0x80) == 0x80)
728 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF);
731 * Set <End of vertical retrace> to minimum (0) and
732 * <Start of vertical Retrace> to maximum (incl. overflow)
733 * Result: turn off vertical sync (VSync) pulse.
735 if (mode & VESA_VSYNC_SUSPEND) {
736 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
737 outb_p(0xff, vga_video_port_val); /* maximum value */
738 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
739 outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */
740 outb_p(0x07, vga_video_port_reg); /* Overflow */
741 outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */
744 if (mode & VESA_HSYNC_SUSPEND) {
746 * Set <End of horizontal retrace> to minimum (0) and
747 * <Start of horizontal Retrace> to maximum
748 * Result: turn off horizontal sync (HSync) pulse.
750 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
751 outb_p(0xff, vga_video_port_val); /* maximum */
752 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
753 outb_p(0x00, vga_video_port_val); /* minimum (0) */
756 /* restore both index registers */
757 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
758 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
759 raw_spin_unlock_irq(&vga_lock);
762 static void vga_vesa_unblank(struct vgastate *state)
764 /* restore original values of VGA controller registers */
765 raw_spin_lock_irq(&vga_lock);
766 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO);
768 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
769 outb_p(vga_state.HorizontalTotal, vga_video_port_val);
770 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
771 outb_p(vga_state.HorizDisplayEnd, vga_video_port_val);
772 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
773 outb_p(vga_state.StartHorizRetrace, vga_video_port_val);
774 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
775 outb_p(vga_state.EndHorizRetrace, vga_video_port_val);
776 outb_p(0x07, vga_video_port_reg); /* Overflow */
777 outb_p(vga_state.Overflow, vga_video_port_val);
778 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
779 outb_p(vga_state.StartVertRetrace, vga_video_port_val);
780 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
781 outb_p(vga_state.EndVertRetrace, vga_video_port_val);
782 outb_p(0x17, vga_video_port_reg); /* ModeControl */
783 outb_p(vga_state.ModeControl, vga_video_port_val);
785 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode);
787 /* restore index/control registers */
788 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
789 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
790 raw_spin_unlock_irq(&vga_lock);
793 static void vga_pal_blank(struct vgastate *state)
797 vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
798 for (i = 0; i < 16; i++) {
799 vga_w(state->vgabase, VGA_PEL_IW, i);
800 vga_w(state->vgabase, VGA_PEL_D, 0);
801 vga_w(state->vgabase, VGA_PEL_D, 0);
802 vga_w(state->vgabase, VGA_PEL_D, 0);
806 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
809 case 0: /* Unblank */
810 if (vga_vesa_blanked) {
811 vga_vesa_unblank(&vgastate);
812 vga_vesa_blanked = 0;
814 if (vga_palette_blanked) {
815 vga_set_palette(c, color_table);
816 vga_palette_blanked = false;
820 /* Tell console.c that it has to restore the screen itself */
822 case 1: /* Normal blanking */
823 case -1: /* Obsolete */
824 if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) {
825 vga_pal_blank(&vgastate);
826 vga_palette_blanked = true;
829 vgacon_set_origin(c);
830 scr_memsetw((void *) vga_vram_base, BLANK,
831 c->vc_screenbuf_size);
835 default: /* VESA blanking */
836 if (vga_video_type == VIDEO_TYPE_VGAC) {
837 vga_vesa_blank(&vgastate, blank - 1);
838 vga_vesa_blanked = blank;
847 * The font loading code goes back to the codepage package by
848 * Joel Hoffman (joel@wam.umd.edu). (He reports that the original
849 * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2
850 * Video Systems_ by Richard Wilton. 1987. Microsoft Press".)
852 * Change for certain monochrome monitors by Yury Shevchuck
853 * (sizif@botik.yaroslavl.su).
856 #define colourmap 0xa0000
857 /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we
858 should use 0xA0000 for the bwmap as well.. */
859 #define blackwmap 0xa0000
862 static int vgacon_do_font_op(struct vgastate *state, char *arg, int set,
865 unsigned short video_port_status = vga_video_port_reg + 6;
866 int font_select = 0x00, beg, i;
868 bool clear_attribs = false;
869 if (vga_video_type != VIDEO_TYPE_EGAM) {
870 charmap = (char *) VGA_MAP_MEM(colourmap, 0);
873 charmap = (char *) VGA_MAP_MEM(blackwmap, 0);
878 * All fonts are loaded in slot 0 (0:1 for 512 ch)
882 return -EINVAL; /* Return to default font not supported */
884 font_select = ch512 ? 0x04 : 0x00;
886 raw_spin_lock_irq(&vga_lock);
887 /* First, the Sequencer */
888 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
889 /* CPU writes only to map 2 */
890 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04);
891 /* Sequential addressing */
892 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07);
893 /* Clear synchronous reset */
894 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
896 /* Now, the graphics controller, select map 2 */
897 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02);
898 /* disable odd-even addressing */
899 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00);
900 /* map start at A000:0000 */
901 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00);
902 raw_spin_unlock_irq(&vga_lock);
906 for (i = 0; i < cmapsz; i++) {
907 vga_writeb(arg[i], charmap + i);
911 for (i = 0; i < cmapsz; i++) {
912 arg[i] = vga_readb(charmap + i);
917 * In 512-character mode, the character map is not contiguous if
918 * we want to remain EGA compatible -- which we do
922 charmap += 2 * cmapsz;
925 for (i = 0; i < cmapsz; i++) {
926 vga_writeb(arg[i], charmap + i);
930 for (i = 0; i < cmapsz; i++) {
931 arg[i] = vga_readb(charmap + i);
937 raw_spin_lock_irq(&vga_lock);
938 /* First, the sequencer, Synchronous reset */
939 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
940 /* CPU writes to maps 0 and 1 */
941 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03);
942 /* odd-even addressing */
943 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03);
944 /* Character Map Select */
946 vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select);
947 /* clear synchronous reset */
948 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
950 /* Now, the graphics controller, select map 0 for CPU */
951 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00);
952 /* enable even-odd addressing */
953 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10);
954 /* map starts at b800:0 or b000:0 */
955 vga_wgfx(state->vgabase, VGA_GFX_MISC, beg);
957 /* if 512 char mode is already enabled don't re-enable it. */
958 if ((set) && (ch512 != vga_512_chars)) {
959 vga_512_chars = ch512;
960 /* 256-char: enable intensity bit
961 512-char: disable intensity bit */
962 inb_p(video_port_status); /* clear address flip-flop */
963 /* color plane enable register */
964 vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);
965 /* Wilton (1987) mentions the following; I don't know what
966 it means, but it works, and it appears necessary */
967 inb_p(video_port_status);
968 vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);
969 clear_attribs = true;
971 raw_spin_unlock_irq(&vga_lock);
974 for (i = 0; i < MAX_NR_CONSOLES; i++) {
975 struct vc_data *c = vc_cons[i].d;
976 if (c && c->vc_sw == &vga_con) {
977 /* force hi font mask to 0, so we always clear
978 the bit on either transition */
979 c->vc_hi_font_mask = 0x00;
980 clear_buffer_attributes(c);
981 c->vc_hi_font_mask = ch512 ? 0x0800 : 0;
989 * Adjust the screen to fit a font of a certain height
991 static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
993 unsigned char ovr, vde, fsr;
994 int rows, maxscan, i;
996 rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */
997 maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */
999 /* Reprogram the CRTC for the new font size
1000 Note: the attempt to read the overflow register will fail
1001 on an EGA, but using 0xff for the previous value appears to
1002 be OK for EGA text modes in the range 257-512 scan lines, so I
1003 guess we don't need to worry about it.
1005 The same applies for the spill bits in the font size and cursor
1006 registers; they are write-only on EGA, but it appears that they
1007 are all don't care bits on EGA, so I guess it doesn't matter. */
1009 raw_spin_lock_irq(&vga_lock);
1010 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1011 ovr = inb_p(vga_video_port_val);
1012 outb_p(0x09, vga_video_port_reg); /* Font size register */
1013 fsr = inb_p(vga_video_port_val);
1014 raw_spin_unlock_irq(&vga_lock);
1016 vde = maxscan & 0xff; /* Vertical display end reg */
1017 ovr = (ovr & 0xbd) + /* Overflow register */
1018 ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3);
1019 fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */
1021 raw_spin_lock_irq(&vga_lock);
1022 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1023 outb_p(ovr, vga_video_port_val);
1024 outb_p(0x09, vga_video_port_reg); /* Font size */
1025 outb_p(fsr, vga_video_port_val);
1026 outb_p(0x12, vga_video_port_reg); /* Vertical display limit */
1027 outb_p(vde, vga_video_port_val);
1028 raw_spin_unlock_irq(&vga_lock);
1029 vga_video_font_height = fontheight;
1031 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1032 struct vc_data *c = vc_cons[i].d;
1034 if (c && c->vc_sw == &vga_con) {
1035 if (con_is_visible(c)) {
1036 /* void size to cause regs to be rewritten */
1037 cursor_size_lastfrom = 0;
1038 cursor_size_lastto = 0;
1039 c->vc_sw->con_cursor(c, CM_DRAW);
1041 c->vc_font.height = c->vc_cell_height = fontheight;
1042 vc_resize(c, 0, rows); /* Adjust console size */
1048 static int vgacon_font_set(struct vc_data *c, struct console_font *font,
1051 unsigned charcount = font->charcount;
1054 if (vga_video_type < VIDEO_TYPE_EGAM)
1057 if (font->width != VGA_FONTWIDTH ||
1058 (charcount != 256 && charcount != 512))
1061 rc = vgacon_do_font_op(&vgastate, font->data, 1, charcount == 512);
1065 if (!(flags & KD_FONT_FLAG_DONT_RECALC))
1066 rc = vgacon_adjust_height(c, font->height);
1070 static int vgacon_font_get(struct vc_data *c, struct console_font *font)
1072 if (vga_video_type < VIDEO_TYPE_EGAM)
1075 font->width = VGA_FONTWIDTH;
1076 font->height = c->vc_font.height;
1077 font->charcount = vga_512_chars ? 512 : 256;
1080 return vgacon_do_font_op(&vgastate, font->data, 0, vga_512_chars);
1083 static int vgacon_resize(struct vc_data *c, unsigned int width,
1084 unsigned int height, unsigned int user)
1086 if ((width << 1) * height > vga_vram_size)
1091 * Ho ho! Someone (svgatextmode, eh?) may have reprogrammed
1092 * the video mode! Set the new defaults then and go away.
1094 screen_info.orig_video_cols = width;
1095 screen_info.orig_video_lines = height;
1096 vga_default_font_height = c->vc_cell_height;
1099 if (width % 2 || width > screen_info.orig_video_cols ||
1100 height > (screen_info.orig_video_lines * vga_default_font_height)/
1104 if (con_is_visible(c) && !vga_is_gfx) /* who knows */
1105 vgacon_doresize(c, width, height);
1109 static int vgacon_set_origin(struct vc_data *c)
1111 if (vga_is_gfx || /* We don't play origin tricks in graphic modes */
1112 (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */
1114 c->vc_origin = c->vc_visible_origin = vga_vram_base;
1116 vga_rolled_over = 0;
1120 static void vgacon_save_screen(struct vc_data *c)
1122 static int vga_bootup_console = 0;
1124 if (!vga_bootup_console) {
1125 /* This is a gross hack, but here is the only place we can
1126 * set bootup console parameters without messing up generic
1127 * console initialization routines.
1129 vga_bootup_console = 1;
1130 c->state.x = screen_info.orig_x;
1131 c->state.y = screen_info.orig_y;
1134 /* We can't copy in more than the size of the video buffer,
1135 * or we'll be copying in VGA BIOS */
1138 scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,
1139 c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
1142 static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
1143 enum con_scroll dir, unsigned int lines)
1148 if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT)
1151 if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2)
1154 vgacon_restore_screen(c);
1155 oldo = c->vc_origin;
1156 delta = lines * c->vc_size_row;
1158 if (c->vc_scr_end + delta >= vga_vram_end) {
1159 scr_memcpyw((u16 *) vga_vram_base,
1160 (u16 *) (oldo + delta),
1161 c->vc_screenbuf_size - delta);
1162 c->vc_origin = vga_vram_base;
1163 vga_rolled_over = oldo - vga_vram_base;
1165 c->vc_origin += delta;
1166 scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size -
1167 delta), c->vc_video_erase_char,
1170 if (oldo - delta < vga_vram_base) {
1171 scr_memmovew((u16 *) (vga_vram_end -
1172 c->vc_screenbuf_size +
1173 delta), (u16 *) oldo,
1174 c->vc_screenbuf_size - delta);
1175 c->vc_origin = vga_vram_end - c->vc_screenbuf_size;
1176 vga_rolled_over = 0;
1178 c->vc_origin -= delta;
1179 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1180 scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char,
1183 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1184 c->vc_visible_origin = c->vc_origin;
1186 c->vc_pos = (c->vc_pos - oldo) + c->vc_origin;
1191 * The console `switch' structure for the VGA based console
1194 static void vgacon_clear(struct vc_data *vc, int sy, int sx, int height,
1196 static void vgacon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
1197 static void vgacon_putcs(struct vc_data *vc, const unsigned short *s,
1198 int count, int ypos, int xpos) { }
1200 const struct consw vga_con = {
1201 .owner = THIS_MODULE,
1202 .con_startup = vgacon_startup,
1203 .con_init = vgacon_init,
1204 .con_deinit = vgacon_deinit,
1205 .con_clear = vgacon_clear,
1206 .con_putc = vgacon_putc,
1207 .con_putcs = vgacon_putcs,
1208 .con_cursor = vgacon_cursor,
1209 .con_scroll = vgacon_scroll,
1210 .con_switch = vgacon_switch,
1211 .con_blank = vgacon_blank,
1212 .con_font_set = vgacon_font_set,
1213 .con_font_get = vgacon_font_get,
1214 .con_resize = vgacon_resize,
1215 .con_set_palette = vgacon_set_palette,
1216 .con_scrolldelta = vgacon_scrolldelta,
1217 .con_set_origin = vgacon_set_origin,
1218 .con_save_screen = vgacon_save_screen,
1219 .con_build_attr = vgacon_build_attr,
1220 .con_invert_region = vgacon_invert_region,
1222 EXPORT_SYMBOL(vga_con);
1224 MODULE_LICENSE("GPL");