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 bool vga_init_done;
83 static unsigned long vga_vram_base __read_mostly; /* Base of video memory */
84 static unsigned long vga_vram_end __read_mostly; /* End of video memory */
85 static unsigned int vga_vram_size __read_mostly; /* Size of video memory */
86 static u16 vga_video_port_reg __read_mostly; /* Video register select port */
87 static u16 vga_video_port_val __read_mostly; /* Video register value port */
88 static unsigned int vga_video_num_columns; /* Number of text columns */
89 static unsigned int vga_video_num_lines; /* Number of text lines */
90 static bool vga_can_do_color; /* Do we support colors? */
91 static unsigned int vga_default_font_height __read_mostly; /* Height of default screen font */
92 static unsigned char vga_video_type __read_mostly; /* Card type */
93 static bool vga_font_is_default = true;
94 static int vga_vesa_blanked;
95 static bool vga_palette_blanked;
96 static bool vga_is_gfx;
97 static bool vga_512_chars;
98 static int vga_video_font_height;
99 static int vga_scan_lines __read_mostly;
100 static unsigned int vga_rolled_over;
102 static bool vgacon_text_mode_force;
103 static bool vga_hardscroll_enabled;
104 static bool vga_hardscroll_user_enable = true;
106 bool vgacon_text_force(void)
108 return vgacon_text_mode_force;
110 EXPORT_SYMBOL(vgacon_text_force);
112 static int __init text_mode(char *str)
114 vgacon_text_mode_force = true;
116 pr_warn("You have booted with nomodeset. This means your GPU drivers are DISABLED\n");
117 pr_warn("Any video related functionality will be severely degraded, and you may not even be able to suspend the system properly\n");
118 pr_warn("Unless you actually understand what nomodeset does, you should reboot without enabling it\n");
123 /* force text mode - used by kernel modesetting */
124 __setup("nomodeset", text_mode);
126 static int __init no_scroll(char *str)
129 * Disabling scrollback is required for the Braillex ib80-piezo
130 * Braille reader made by F.H. Papenmeier (Germany).
131 * Use the "no-scroll" bootflag.
133 vga_hardscroll_user_enable = vga_hardscroll_enabled = false;
137 __setup("no-scroll", no_scroll);
140 * By replacing the four outb_p with two back to back outw, we can reduce
141 * the window of opportunity to see text mislocated to the RHS of the
142 * console during heavy scrolling activity. However there is the remote
143 * possibility that some pre-dinosaur hardware won't like the back to back
144 * I/O. Since the Xservers get away with it, we should be able to as well.
146 static inline void write_vga(unsigned char reg, unsigned int val)
152 * ddprintk might set the console position from interrupt
153 * handlers, thus the write has to be IRQ-atomic.
155 raw_spin_lock_irqsave(&vga_lock, flags);
156 v1 = reg + (val & 0xff00);
157 v2 = reg + 1 + ((val << 8) & 0xff00);
158 outw(v1, vga_video_port_reg);
159 outw(v2, vga_video_port_reg);
160 raw_spin_unlock_irqrestore(&vga_lock, flags);
163 static inline void vga_set_mem_top(struct vc_data *c)
165 write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2);
168 static void vgacon_restore_screen(struct vc_data *c)
170 if (c->vc_origin != c->vc_visible_origin)
171 vgacon_scrolldelta(c, 0);
174 static void vgacon_scrolldelta(struct vc_data *c, int lines)
176 vc_scrolldelta_helper(c, lines, vga_rolled_over, (void *)vga_vram_base,
181 static const char *vgacon_startup(void)
183 const char *display_desc = NULL;
187 if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB ||
188 screen_info.orig_video_isVGA == VIDEO_TYPE_EFI) {
190 #ifdef CONFIG_DUMMY_CONSOLE
191 conswitchp = &dummy_con;
192 return conswitchp->con_startup();
198 /* boot_params.screen_info reasonably initialized? */
199 if ((screen_info.orig_video_lines == 0) ||
200 (screen_info.orig_video_cols == 0))
203 /* VGA16 modes are not handled by VGACON */
204 if ((screen_info.orig_video_mode == 0x0D) || /* 320x200/4 */
205 (screen_info.orig_video_mode == 0x0E) || /* 640x200/4 */
206 (screen_info.orig_video_mode == 0x10) || /* 640x350/4 */
207 (screen_info.orig_video_mode == 0x12) || /* 640x480/4 */
208 (screen_info.orig_video_mode == 0x6A)) /* 800x600/4 (VESA) */
211 vga_video_num_lines = screen_info.orig_video_lines;
212 vga_video_num_columns = screen_info.orig_video_cols;
213 vgastate.vgabase = NULL;
215 if (screen_info.orig_video_mode == 7) {
216 /* Monochrome display */
217 vga_vram_base = 0xb0000;
218 vga_video_port_reg = VGA_CRT_IM;
219 vga_video_port_val = VGA_CRT_DM;
220 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
221 static struct resource ega_console_resource =
223 .flags = IORESOURCE_IO,
226 vga_video_type = VIDEO_TYPE_EGAM;
227 vga_vram_size = 0x8000;
228 display_desc = "EGA+";
229 request_resource(&ioport_resource,
230 &ega_console_resource);
232 static struct resource mda1_console_resource =
234 .flags = IORESOURCE_IO,
237 static struct resource mda2_console_resource =
239 .flags = IORESOURCE_IO,
242 vga_video_type = VIDEO_TYPE_MDA;
243 vga_vram_size = 0x2000;
244 display_desc = "*MDA";
245 request_resource(&ioport_resource,
246 &mda1_console_resource);
247 request_resource(&ioport_resource,
248 &mda2_console_resource);
249 vga_video_font_height = 14;
252 /* If not, it is color. */
253 vga_can_do_color = true;
254 vga_vram_base = 0xb8000;
255 vga_video_port_reg = VGA_CRT_IC;
256 vga_video_port_val = VGA_CRT_DC;
257 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) {
260 vga_vram_size = 0x8000;
262 if (!screen_info.orig_video_isVGA) {
263 static struct resource ega_console_resource =
265 .flags = IORESOURCE_IO,
268 vga_video_type = VIDEO_TYPE_EGAC;
269 display_desc = "EGA";
270 request_resource(&ioport_resource,
271 &ega_console_resource);
273 static struct resource vga_console_resource =
275 .flags = IORESOURCE_IO,
278 vga_video_type = VIDEO_TYPE_VGAC;
279 display_desc = "VGA+";
280 request_resource(&ioport_resource,
281 &vga_console_resource);
284 * Normalise the palette registers, to point
285 * the 16 screen colours to the first 16
289 for (i = 0; i < 16; i++) {
291 outb_p(i, VGA_ATT_W);
292 outb_p(i, VGA_ATT_W);
294 outb_p(0x20, VGA_ATT_W);
297 * Now set the DAC registers back to their
300 for (i = 0; i < 16; i++) {
301 outb_p(color_table[i], VGA_PEL_IW);
302 outb_p(default_red[i], VGA_PEL_D);
303 outb_p(default_grn[i], VGA_PEL_D);
304 outb_p(default_blu[i], VGA_PEL_D);
308 static struct resource cga_console_resource =
310 .flags = IORESOURCE_IO,
313 vga_video_type = VIDEO_TYPE_CGA;
314 vga_vram_size = 0x2000;
315 display_desc = "*CGA";
316 request_resource(&ioport_resource,
317 &cga_console_resource);
318 vga_video_font_height = 8;
322 vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size);
323 vga_vram_end = vga_vram_base + vga_vram_size;
326 * Find out if there is a graphics card present.
327 * Are there smarter methods around?
329 p = (volatile u16 *) vga_vram_base;
330 saved1 = scr_readw(p);
331 saved2 = scr_readw(p + 1);
332 scr_writew(0xAA55, p);
333 scr_writew(0x55AA, p + 1);
334 if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) {
335 scr_writew(saved1, p);
336 scr_writew(saved2, p + 1);
339 scr_writew(0x55AA, p);
340 scr_writew(0xAA55, p + 1);
341 if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) {
342 scr_writew(saved1, p);
343 scr_writew(saved2, p + 1);
346 scr_writew(saved1, p);
347 scr_writew(saved2, p + 1);
349 if (vga_video_type == VIDEO_TYPE_EGAC
350 || vga_video_type == VIDEO_TYPE_VGAC
351 || vga_video_type == VIDEO_TYPE_EGAM) {
352 vga_hardscroll_enabled = vga_hardscroll_user_enable;
353 vga_default_font_height = screen_info.orig_video_points;
354 vga_video_font_height = screen_info.orig_video_points;
355 /* This may be suboptimal but is a safe bet - go with it */
357 vga_video_font_height * vga_video_num_lines;
360 vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH;
361 vgacon_yres = vga_scan_lines;
363 vga_init_done = true;
368 static void vgacon_init(struct vc_data *c, int init)
370 struct uni_pagedir *p;
373 * We cannot be loaded as a module, therefore init will be 1
374 * if we are the default console, however if we are a fallback
375 * console, for example if fbcon has failed registration, then
376 * init will be 0, so we need to make sure our boot parameters
377 * have been copied to the console structure for vgacon_resize
378 * ultimately called by vc_resize. Any subsequent calls to
379 * vgacon_init init will have init set to 0 too.
381 c->vc_can_do_color = vga_can_do_color;
382 c->vc_scan_lines = vga_scan_lines;
383 c->vc_font.height = c->vc_cell_height = vga_video_font_height;
385 /* set dimensions manually if init != 0 since vc_resize() will fail */
387 c->vc_cols = vga_video_num_columns;
388 c->vc_rows = vga_video_num_lines;
390 vc_resize(c, vga_video_num_columns, vga_video_num_lines);
392 c->vc_complement_mask = 0x7700;
394 c->vc_hi_font_mask = 0x0800;
395 p = *c->vc_uni_pagedir_loc;
396 if (c->vc_uni_pagedir_loc != &vgacon_uni_pagedir) {
398 c->vc_uni_pagedir_loc = &vgacon_uni_pagedir;
401 if (!vgacon_uni_pagedir && p)
402 con_set_default_unimap(c);
404 /* Only set the default if the user didn't deliberately override it */
405 if (global_cursor_default == -1)
406 global_cursor_default =
407 !(screen_info.flags & VIDEO_FLAGS_NOCURSOR);
410 static void vgacon_deinit(struct vc_data *c)
412 /* When closing the active console, reset video origin */
413 if (con_is_visible(c)) {
414 c->vc_visible_origin = vga_vram_base;
418 if (!--vgacon_refcount)
420 c->vc_uni_pagedir_loc = &c->vc_uni_pagedir;
421 con_set_default_unimap(c);
424 static u8 vgacon_build_attr(struct vc_data *c, u8 color,
425 enum vc_intensity intensity,
426 bool blink, bool underline, bool reverse,
431 if (vga_can_do_color) {
433 attr = (attr & 0xF0) | c->vc_itcolor;
435 attr = (attr & 0xf0) | c->vc_ulcolor;
436 else if (intensity == VCI_HALF_BRIGHT)
437 attr = (attr & 0xf0) | c->vc_halfcolor;
441 ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) &
445 if (intensity == VCI_BOLD)
447 if (!vga_can_do_color) {
449 attr = (attr & 0xF8) | 0x02;
451 attr = (attr & 0xf8) | 0x01;
452 else if (intensity == VCI_HALF_BRIGHT)
453 attr = (attr & 0xf0) | 0x08;
458 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count)
460 const bool col = vga_can_do_color;
463 u16 a = scr_readw(p);
465 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) |
466 (((a) & 0x0700) << 4);
468 a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700;
473 static void vgacon_set_cursor_size(int xpos, int from, int to)
478 if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto))
480 cursor_size_lastfrom = from;
481 cursor_size_lastto = to;
483 raw_spin_lock_irqsave(&vga_lock, flags);
484 if (vga_video_type >= VIDEO_TYPE_VGAC) {
485 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
486 curs = inb_p(vga_video_port_val);
487 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
488 cure = inb_p(vga_video_port_val);
494 curs = (curs & 0xc0) | from;
495 cure = (cure & 0xe0) | to;
497 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg);
498 outb_p(curs, vga_video_port_val);
499 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg);
500 outb_p(cure, vga_video_port_val);
501 raw_spin_unlock_irqrestore(&vga_lock, flags);
504 static void vgacon_cursor(struct vc_data *c, int mode)
506 if (c->vc_mode != KD_TEXT)
509 vgacon_restore_screen(c);
513 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
514 if (vga_video_type >= VIDEO_TYPE_VGAC)
515 vgacon_set_cursor_size(c->state.x, 31, 30);
517 vgacon_set_cursor_size(c->state.x, 31, 31);
522 write_vga(14, (c->vc_pos - vga_vram_base) / 2);
523 switch (CUR_SIZE(c->vc_cursor_type)) {
525 vgacon_set_cursor_size(c->state.x,
534 vgacon_set_cursor_size(c->state.x,
535 c->vc_cell_height / 3,
540 case CUR_LOWER_THIRD:
541 vgacon_set_cursor_size(c->state.x,
542 (c->vc_cell_height * 2) / 3,
548 vgacon_set_cursor_size(c->state.x,
549 c->vc_cell_height / 2,
555 if (vga_video_type >= VIDEO_TYPE_VGAC)
556 vgacon_set_cursor_size(c->state.x, 31, 30);
558 vgacon_set_cursor_size(c->state.x, 31, 31);
561 vgacon_set_cursor_size(c->state.x, 1,
569 static int vgacon_doresize(struct vc_data *c,
570 unsigned int width, unsigned int height)
573 unsigned int scanlines = height * c->vc_cell_height;
574 u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan;
576 raw_spin_lock_irqsave(&vga_lock, flags);
578 vgacon_xres = width * VGA_FONTWIDTH;
579 vgacon_yres = height * c->vc_cell_height;
580 if (vga_video_type >= VIDEO_TYPE_VGAC) {
581 outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
582 max_scan = inb_p(vga_video_port_val);
587 outb_p(VGA_CRTC_MODE, vga_video_port_reg);
588 mode = inb_p(vga_video_port_val);
594 scanlines_lo = scanlines & 0xff;
596 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
597 r7 = inb_p(vga_video_port_val) & ~0x42;
599 if (scanlines & 0x100)
601 if (scanlines & 0x200)
604 /* deprotect registers */
605 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
606 vsync_end = inb_p(vga_video_port_val);
607 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
608 outb_p(vsync_end & ~0x80, vga_video_port_val);
611 outb_p(VGA_CRTC_H_DISP, vga_video_port_reg);
612 outb_p(width - 1, vga_video_port_val);
613 outb_p(VGA_CRTC_OFFSET, vga_video_port_reg);
614 outb_p(width >> 1, vga_video_port_val);
616 if (vga_video_type >= VIDEO_TYPE_VGAC) {
617 outb_p(VGA_CRTC_V_DISP_END, vga_video_port_reg);
618 outb_p(scanlines_lo, vga_video_port_val);
619 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg);
620 outb_p(r7,vga_video_port_val);
622 /* reprotect registers */
623 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg);
624 outb_p(vsync_end, vga_video_port_val);
627 raw_spin_unlock_irqrestore(&vga_lock, flags);
631 static int vgacon_switch(struct vc_data *c)
633 int x = c->vc_cols * VGA_FONTWIDTH;
634 int y = c->vc_rows * c->vc_cell_height;
635 int rows = screen_info.orig_video_lines * vga_default_font_height/
638 * We need to save screen size here as it's the only way
639 * we can spot the screen has been resized and we need to
640 * set size of freshly allocated screens ourselves.
642 vga_video_num_columns = c->vc_cols;
643 vga_video_num_lines = c->vc_rows;
645 /* We can only copy out the size of the video buffer here,
646 * otherwise we get into VGA BIOS */
649 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf,
650 c->vc_screenbuf_size > vga_vram_size ?
651 vga_vram_size : c->vc_screenbuf_size);
653 if ((vgacon_xres != x || vgacon_yres != y) &&
654 (!(vga_video_num_columns % 2) &&
655 vga_video_num_columns <= screen_info.orig_video_cols &&
656 vga_video_num_lines <= rows))
657 vgacon_doresize(c, c->vc_cols, c->vc_rows);
660 return 0; /* Redrawing not needed */
663 static void vga_set_palette(struct vc_data *vc, const unsigned char *table)
667 vga_w(vgastate.vgabase, VGA_PEL_MSK, 0xff);
668 for (i = j = 0; i < 16; i++) {
669 vga_w(vgastate.vgabase, VGA_PEL_IW, table[i]);
670 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
671 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
672 vga_w(vgastate.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2);
676 static void vgacon_set_palette(struct vc_data *vc, const unsigned char *table)
678 if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked
679 || !con_is_visible(vc))
681 vga_set_palette(vc, table);
684 /* structure holding original VGA register settings */
686 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */
687 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */
688 unsigned char CrtMiscIO; /* Miscellaneous register */
689 unsigned char HorizontalTotal; /* CRT-Controller:00h */
690 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */
691 unsigned char StartHorizRetrace; /* CRT-Controller:04h */
692 unsigned char EndHorizRetrace; /* CRT-Controller:05h */
693 unsigned char Overflow; /* CRT-Controller:07h */
694 unsigned char StartVertRetrace; /* CRT-Controller:10h */
695 unsigned char EndVertRetrace; /* CRT-Controller:11h */
696 unsigned char ModeControl; /* CRT-Controller:17h */
697 unsigned char ClockingMode; /* Seq-Controller:01h */
700 static void vga_vesa_blank(struct vgastate *state, int mode)
702 /* save original values of VGA controller registers */
703 if (!vga_vesa_blanked) {
704 raw_spin_lock_irq(&vga_lock);
705 vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I);
706 vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg);
707 vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R);
708 raw_spin_unlock_irq(&vga_lock);
710 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
711 vga_state.HorizontalTotal = inb_p(vga_video_port_val);
712 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
713 vga_state.HorizDisplayEnd = inb_p(vga_video_port_val);
714 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
715 vga_state.StartHorizRetrace = inb_p(vga_video_port_val);
716 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
717 vga_state.EndHorizRetrace = inb_p(vga_video_port_val);
718 outb_p(0x07, vga_video_port_reg); /* Overflow */
719 vga_state.Overflow = inb_p(vga_video_port_val);
720 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
721 vga_state.StartVertRetrace = inb_p(vga_video_port_val);
722 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
723 vga_state.EndVertRetrace = inb_p(vga_video_port_val);
724 outb_p(0x17, vga_video_port_reg); /* ModeControl */
725 vga_state.ModeControl = inb_p(vga_video_port_val);
726 vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE);
729 /* assure that video is enabled */
730 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */
731 raw_spin_lock_irq(&vga_lock);
732 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20);
734 /* test for vertical retrace in process.... */
735 if ((vga_state.CrtMiscIO & 0x80) == 0x80)
736 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF);
739 * Set <End of vertical retrace> to minimum (0) and
740 * <Start of vertical Retrace> to maximum (incl. overflow)
741 * Result: turn off vertical sync (VSync) pulse.
743 if (mode & VESA_VSYNC_SUSPEND) {
744 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
745 outb_p(0xff, vga_video_port_val); /* maximum value */
746 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
747 outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */
748 outb_p(0x07, vga_video_port_reg); /* Overflow */
749 outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */
752 if (mode & VESA_HSYNC_SUSPEND) {
754 * Set <End of horizontal retrace> to minimum (0) and
755 * <Start of horizontal Retrace> to maximum
756 * Result: turn off horizontal sync (HSync) pulse.
758 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
759 outb_p(0xff, vga_video_port_val); /* maximum */
760 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
761 outb_p(0x00, vga_video_port_val); /* minimum (0) */
764 /* restore both index registers */
765 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
766 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
767 raw_spin_unlock_irq(&vga_lock);
770 static void vga_vesa_unblank(struct vgastate *state)
772 /* restore original values of VGA controller registers */
773 raw_spin_lock_irq(&vga_lock);
774 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO);
776 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */
777 outb_p(vga_state.HorizontalTotal, vga_video_port_val);
778 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */
779 outb_p(vga_state.HorizDisplayEnd, vga_video_port_val);
780 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */
781 outb_p(vga_state.StartHorizRetrace, vga_video_port_val);
782 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */
783 outb_p(vga_state.EndHorizRetrace, vga_video_port_val);
784 outb_p(0x07, vga_video_port_reg); /* Overflow */
785 outb_p(vga_state.Overflow, vga_video_port_val);
786 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */
787 outb_p(vga_state.StartVertRetrace, vga_video_port_val);
788 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */
789 outb_p(vga_state.EndVertRetrace, vga_video_port_val);
790 outb_p(0x17, vga_video_port_reg); /* ModeControl */
791 outb_p(vga_state.ModeControl, vga_video_port_val);
793 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode);
795 /* restore index/control registers */
796 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex);
797 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg);
798 raw_spin_unlock_irq(&vga_lock);
801 static void vga_pal_blank(struct vgastate *state)
805 vga_w(state->vgabase, VGA_PEL_MSK, 0xff);
806 for (i = 0; i < 16; i++) {
807 vga_w(state->vgabase, VGA_PEL_IW, i);
808 vga_w(state->vgabase, VGA_PEL_D, 0);
809 vga_w(state->vgabase, VGA_PEL_D, 0);
810 vga_w(state->vgabase, VGA_PEL_D, 0);
814 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch)
817 case 0: /* Unblank */
818 if (vga_vesa_blanked) {
819 vga_vesa_unblank(&vgastate);
820 vga_vesa_blanked = 0;
822 if (vga_palette_blanked) {
823 vga_set_palette(c, color_table);
824 vga_palette_blanked = false;
828 /* Tell console.c that it has to restore the screen itself */
830 case 1: /* Normal blanking */
831 case -1: /* Obsolete */
832 if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) {
833 vga_pal_blank(&vgastate);
834 vga_palette_blanked = true;
837 vgacon_set_origin(c);
838 scr_memsetw((void *) vga_vram_base, BLANK,
839 c->vc_screenbuf_size);
843 default: /* VESA blanking */
844 if (vga_video_type == VIDEO_TYPE_VGAC) {
845 vga_vesa_blank(&vgastate, blank - 1);
846 vga_vesa_blanked = blank;
855 * The font loading code goes back to the codepage package by
856 * Joel Hoffman (joel@wam.umd.edu). (He reports that the original
857 * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2
858 * Video Systems_ by Richard Wilton. 1987. Microsoft Press".)
860 * Change for certain monochrome monitors by Yury Shevchuck
861 * (sizif@botik.yaroslavl.su).
864 #define colourmap 0xa0000
865 /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we
866 should use 0xA0000 for the bwmap as well.. */
867 #define blackwmap 0xa0000
870 static int vgacon_do_font_op(struct vgastate *state, char *arg, int set,
873 unsigned short video_port_status = vga_video_port_reg + 6;
874 int font_select = 0x00, beg, i;
876 bool clear_attribs = false;
877 if (vga_video_type != VIDEO_TYPE_EGAM) {
878 charmap = (char *) VGA_MAP_MEM(colourmap, 0);
881 charmap = (char *) VGA_MAP_MEM(blackwmap, 0);
885 #ifdef BROKEN_GRAPHICS_PROGRAMS
887 * All fonts are loaded in slot 0 (0:1 for 512 ch)
891 return -EINVAL; /* Return to default font not supported */
893 vga_font_is_default = false;
894 font_select = ch512 ? 0x04 : 0x00;
897 * The default font is kept in slot 0 and is never touched.
898 * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch)
902 vga_font_is_default = !arg;
904 ch512 = false; /* Default font is always 256 */
905 font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00;
908 if (!vga_font_is_default)
909 charmap += 4 * cmapsz;
912 raw_spin_lock_irq(&vga_lock);
913 /* First, the Sequencer */
914 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1);
915 /* CPU writes only to map 2 */
916 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04);
917 /* Sequential addressing */
918 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07);
919 /* Clear synchronous reset */
920 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
922 /* Now, the graphics controller, select map 2 */
923 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02);
924 /* disable odd-even addressing */
925 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00);
926 /* map start at A000:0000 */
927 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00);
928 raw_spin_unlock_irq(&vga_lock);
932 for (i = 0; i < cmapsz; i++) {
933 vga_writeb(arg[i], charmap + i);
937 for (i = 0; i < cmapsz; i++) {
938 arg[i] = vga_readb(charmap + i);
943 * In 512-character mode, the character map is not contiguous if
944 * we want to remain EGA compatible -- which we do
948 charmap += 2 * cmapsz;
951 for (i = 0; i < cmapsz; i++) {
952 vga_writeb(arg[i], charmap + i);
956 for (i = 0; i < cmapsz; i++) {
957 arg[i] = vga_readb(charmap + i);
963 raw_spin_lock_irq(&vga_lock);
964 /* First, the sequencer, Synchronous reset */
965 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01);
966 /* CPU writes to maps 0 and 1 */
967 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03);
968 /* odd-even addressing */
969 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03);
970 /* Character Map Select */
972 vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select);
973 /* clear synchronous reset */
974 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03);
976 /* Now, the graphics controller, select map 0 for CPU */
977 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00);
978 /* enable even-odd addressing */
979 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10);
980 /* map starts at b800:0 or b000:0 */
981 vga_wgfx(state->vgabase, VGA_GFX_MISC, beg);
983 /* if 512 char mode is already enabled don't re-enable it. */
984 if ((set) && (ch512 != vga_512_chars)) {
985 vga_512_chars = ch512;
986 /* 256-char: enable intensity bit
987 512-char: disable intensity bit */
988 inb_p(video_port_status); /* clear address flip-flop */
989 /* color plane enable register */
990 vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);
991 /* Wilton (1987) mentions the following; I don't know what
992 it means, but it works, and it appears necessary */
993 inb_p(video_port_status);
994 vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0);
995 clear_attribs = true;
997 raw_spin_unlock_irq(&vga_lock);
1000 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1001 struct vc_data *c = vc_cons[i].d;
1002 if (c && c->vc_sw == &vga_con) {
1003 /* force hi font mask to 0, so we always clear
1004 the bit on either transition */
1005 c->vc_hi_font_mask = 0x00;
1006 clear_buffer_attributes(c);
1007 c->vc_hi_font_mask = ch512 ? 0x0800 : 0;
1015 * Adjust the screen to fit a font of a certain height
1017 static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight)
1019 unsigned char ovr, vde, fsr;
1020 int rows, maxscan, i;
1022 rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */
1023 maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */
1025 /* Reprogram the CRTC for the new font size
1026 Note: the attempt to read the overflow register will fail
1027 on an EGA, but using 0xff for the previous value appears to
1028 be OK for EGA text modes in the range 257-512 scan lines, so I
1029 guess we don't need to worry about it.
1031 The same applies for the spill bits in the font size and cursor
1032 registers; they are write-only on EGA, but it appears that they
1033 are all don't care bits on EGA, so I guess it doesn't matter. */
1035 raw_spin_lock_irq(&vga_lock);
1036 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1037 ovr = inb_p(vga_video_port_val);
1038 outb_p(0x09, vga_video_port_reg); /* Font size register */
1039 fsr = inb_p(vga_video_port_val);
1040 raw_spin_unlock_irq(&vga_lock);
1042 vde = maxscan & 0xff; /* Vertical display end reg */
1043 ovr = (ovr & 0xbd) + /* Overflow register */
1044 ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3);
1045 fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */
1047 raw_spin_lock_irq(&vga_lock);
1048 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */
1049 outb_p(ovr, vga_video_port_val);
1050 outb_p(0x09, vga_video_port_reg); /* Font size */
1051 outb_p(fsr, vga_video_port_val);
1052 outb_p(0x12, vga_video_port_reg); /* Vertical display limit */
1053 outb_p(vde, vga_video_port_val);
1054 raw_spin_unlock_irq(&vga_lock);
1055 vga_video_font_height = fontheight;
1057 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1058 struct vc_data *c = vc_cons[i].d;
1060 if (c && c->vc_sw == &vga_con) {
1061 if (con_is_visible(c)) {
1062 /* void size to cause regs to be rewritten */
1063 cursor_size_lastfrom = 0;
1064 cursor_size_lastto = 0;
1065 c->vc_sw->con_cursor(c, CM_DRAW);
1067 c->vc_font.height = c->vc_cell_height = fontheight;
1068 vc_resize(c, 0, rows); /* Adjust console size */
1074 static int vgacon_font_set(struct vc_data *c, struct console_font *font,
1077 unsigned charcount = font->charcount;
1080 if (vga_video_type < VIDEO_TYPE_EGAM)
1083 if (font->width != VGA_FONTWIDTH ||
1084 (charcount != 256 && charcount != 512))
1087 rc = vgacon_do_font_op(&vgastate, font->data, 1, charcount == 512);
1091 if (!(flags & KD_FONT_FLAG_DONT_RECALC))
1092 rc = vgacon_adjust_height(c, font->height);
1096 static int vgacon_font_get(struct vc_data *c, struct console_font *font)
1098 if (vga_video_type < VIDEO_TYPE_EGAM)
1101 font->width = VGA_FONTWIDTH;
1102 font->height = c->vc_font.height;
1103 font->charcount = vga_512_chars ? 512 : 256;
1106 return vgacon_do_font_op(&vgastate, font->data, 0, vga_512_chars);
1109 static int vgacon_resize(struct vc_data *c, unsigned int width,
1110 unsigned int height, unsigned int user)
1112 if ((width << 1) * height > vga_vram_size)
1117 * Ho ho! Someone (svgatextmode, eh?) may have reprogrammed
1118 * the video mode! Set the new defaults then and go away.
1120 screen_info.orig_video_cols = width;
1121 screen_info.orig_video_lines = height;
1122 vga_default_font_height = c->vc_cell_height;
1125 if (width % 2 || width > screen_info.orig_video_cols ||
1126 height > (screen_info.orig_video_lines * vga_default_font_height)/
1130 if (con_is_visible(c) && !vga_is_gfx) /* who knows */
1131 vgacon_doresize(c, width, height);
1135 static int vgacon_set_origin(struct vc_data *c)
1137 if (vga_is_gfx || /* We don't play origin tricks in graphic modes */
1138 (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */
1140 c->vc_origin = c->vc_visible_origin = vga_vram_base;
1142 vga_rolled_over = 0;
1146 static void vgacon_save_screen(struct vc_data *c)
1148 static int vga_bootup_console = 0;
1150 if (!vga_bootup_console) {
1151 /* This is a gross hack, but here is the only place we can
1152 * set bootup console parameters without messing up generic
1153 * console initialization routines.
1155 vga_bootup_console = 1;
1156 c->state.x = screen_info.orig_x;
1157 c->state.y = screen_info.orig_y;
1160 /* We can't copy in more than the size of the video buffer,
1161 * or we'll be copying in VGA BIOS */
1164 scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin,
1165 c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size);
1168 static bool vgacon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
1169 enum con_scroll dir, unsigned int lines)
1174 if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT)
1177 if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2)
1180 vgacon_restore_screen(c);
1181 oldo = c->vc_origin;
1182 delta = lines * c->vc_size_row;
1184 if (c->vc_scr_end + delta >= vga_vram_end) {
1185 scr_memcpyw((u16 *) vga_vram_base,
1186 (u16 *) (oldo + delta),
1187 c->vc_screenbuf_size - delta);
1188 c->vc_origin = vga_vram_base;
1189 vga_rolled_over = oldo - vga_vram_base;
1191 c->vc_origin += delta;
1192 scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size -
1193 delta), c->vc_video_erase_char,
1196 if (oldo - delta < vga_vram_base) {
1197 scr_memmovew((u16 *) (vga_vram_end -
1198 c->vc_screenbuf_size +
1199 delta), (u16 *) oldo,
1200 c->vc_screenbuf_size - delta);
1201 c->vc_origin = vga_vram_end - c->vc_screenbuf_size;
1202 vga_rolled_over = 0;
1204 c->vc_origin -= delta;
1205 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1206 scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char,
1209 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1210 c->vc_visible_origin = c->vc_origin;
1212 c->vc_pos = (c->vc_pos - oldo) + c->vc_origin;
1217 * The console `switch' structure for the VGA based console
1220 static void vgacon_clear(struct vc_data *vc, int sy, int sx, int height,
1222 static void vgacon_putc(struct vc_data *vc, int c, int ypos, int xpos) { }
1223 static void vgacon_putcs(struct vc_data *vc, const unsigned short *s,
1224 int count, int ypos, int xpos) { }
1226 const struct consw vga_con = {
1227 .owner = THIS_MODULE,
1228 .con_startup = vgacon_startup,
1229 .con_init = vgacon_init,
1230 .con_deinit = vgacon_deinit,
1231 .con_clear = vgacon_clear,
1232 .con_putc = vgacon_putc,
1233 .con_putcs = vgacon_putcs,
1234 .con_cursor = vgacon_cursor,
1235 .con_scroll = vgacon_scroll,
1236 .con_switch = vgacon_switch,
1237 .con_blank = vgacon_blank,
1238 .con_font_set = vgacon_font_set,
1239 .con_font_get = vgacon_font_get,
1240 .con_resize = vgacon_resize,
1241 .con_set_palette = vgacon_set_palette,
1242 .con_scrolldelta = vgacon_scrolldelta,
1243 .con_set_origin = vgacon_set_origin,
1244 .con_save_screen = vgacon_save_screen,
1245 .con_build_attr = vgacon_build_attr,
1246 .con_invert_region = vgacon_invert_region,
1248 EXPORT_SYMBOL(vga_con);
1250 MODULE_LICENSE("GPL");