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1da177e4 LT |
1 | /* |
2 | * linux/drivers/video/vgacon.c -- Low level VGA based console driver | |
3 | * | |
4 | * Created 28 Sep 1997 by Geert Uytterhoeven | |
5 | * | |
6 | * Rewritten by Martin Mares <mj@ucw.cz>, July 1998 | |
7 | * | |
8 | * This file is based on the old console.c, vga.c and vesa_blank.c drivers. | |
9 | * | |
10 | * Copyright (C) 1991, 1992 Linus Torvalds | |
11 | * 1995 Jay Estabrook | |
12 | * | |
13 | * User definable mapping table and font loading by Eugene G. Crosser, | |
14 | * <crosser@average.org> | |
15 | * | |
16 | * Improved loadable font/UTF-8 support by H. Peter Anvin | |
17 | * Feb-Sep 1995 <peter.anvin@linux.org> | |
18 | * | |
19 | * Colour palette handling, by Simon Tatham | |
20 | * 17-Jun-95 <sgt20@cam.ac.uk> | |
21 | * | |
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> | |
25 | * | |
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. | |
29 | * | |
30 | * | |
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 | |
33 | * more details. | |
34 | */ | |
35 | ||
36 | #include <linux/config.h> | |
37 | #include <linux/module.h> | |
38 | #include <linux/types.h> | |
39 | #include <linux/sched.h> | |
40 | #include <linux/fs.h> | |
41 | #include <linux/kernel.h> | |
42 | #include <linux/tty.h> | |
43 | #include <linux/console.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/kd.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/vt_kern.h> | |
48 | #include <linux/selection.h> | |
49 | #include <linux/spinlock.h> | |
50 | #include <linux/ioport.h> | |
51 | #include <linux/init.h> | |
52 | #include <linux/smp_lock.h> | |
53 | #include <video/vga.h> | |
54 | #include <asm/io.h> | |
55 | ||
56 | static DEFINE_SPINLOCK(vga_lock); | |
57 | static int cursor_size_lastfrom; | |
58 | static int cursor_size_lastto; | |
59 | static struct vgastate state; | |
60 | ||
61 | #define BLANK 0x0020 | |
62 | ||
63 | #define CAN_LOAD_EGA_FONTS /* undefine if the user must not do this */ | |
64 | #define CAN_LOAD_PALETTE /* undefine if the user must not do this */ | |
65 | ||
66 | /* You really do _NOT_ want to define this, unless you have buggy | |
67 | * Trident VGA which will resize cursor when moving it between column | |
68 | * 15 & 16. If you define this and your VGA is OK, inverse bug will | |
69 | * appear. | |
70 | */ | |
71 | #undef TRIDENT_GLITCH | |
72 | ||
73 | /* | |
74 | * Interface used by the world | |
75 | */ | |
76 | ||
77 | static const char *vgacon_startup(void); | |
78 | static void vgacon_init(struct vc_data *c, int init); | |
79 | static void vgacon_deinit(struct vc_data *c); | |
80 | static void vgacon_cursor(struct vc_data *c, int mode); | |
81 | static int vgacon_switch(struct vc_data *c); | |
82 | static int vgacon_blank(struct vc_data *c, int blank, int mode_switch); | |
83 | static int vgacon_set_palette(struct vc_data *vc, unsigned char *table); | |
84 | static int vgacon_scrolldelta(struct vc_data *c, int lines); | |
85 | static int vgacon_set_origin(struct vc_data *c); | |
86 | static void vgacon_save_screen(struct vc_data *c); | |
87 | static int vgacon_scroll(struct vc_data *c, int t, int b, int dir, | |
88 | int lines); | |
89 | static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity, | |
90 | u8 blink, u8 underline, u8 reverse); | |
91 | static void vgacon_invert_region(struct vc_data *c, u16 * p, int count); | |
92 | static unsigned long vgacon_uni_pagedir[2]; | |
93 | ||
94 | ||
95 | /* Description of the hardware situation */ | |
96 | static unsigned long vga_vram_base; /* Base of video memory */ | |
97 | static unsigned long vga_vram_end; /* End of video memory */ | |
98 | static u16 vga_video_port_reg; /* Video register select port */ | |
99 | static u16 vga_video_port_val; /* Video register value port */ | |
100 | static unsigned int vga_video_num_columns; /* Number of text columns */ | |
101 | static unsigned int vga_video_num_lines; /* Number of text lines */ | |
102 | static int vga_can_do_color = 0; /* Do we support colors? */ | |
103 | static unsigned int vga_default_font_height;/* Height of default screen font */ | |
104 | static unsigned char vga_video_type; /* Card type */ | |
105 | static unsigned char vga_hardscroll_enabled; | |
106 | static unsigned char vga_hardscroll_user_enable = 1; | |
107 | static unsigned char vga_font_is_default = 1; | |
108 | static int vga_vesa_blanked; | |
109 | static int vga_palette_blanked; | |
110 | static int vga_is_gfx; | |
111 | static int vga_512_chars; | |
112 | static int vga_video_font_height; | |
113 | static int vga_scan_lines; | |
114 | static unsigned int vga_rolled_over = 0; | |
115 | ||
116 | static int __init no_scroll(char *str) | |
117 | { | |
118 | /* | |
119 | * Disabling scrollback is required for the Braillex ib80-piezo | |
120 | * Braille reader made by F.H. Papenmeier (Germany). | |
121 | * Use the "no-scroll" bootflag. | |
122 | */ | |
123 | vga_hardscroll_user_enable = vga_hardscroll_enabled = 0; | |
124 | return 1; | |
125 | } | |
126 | ||
127 | __setup("no-scroll", no_scroll); | |
128 | ||
129 | /* | |
130 | * By replacing the four outb_p with two back to back outw, we can reduce | |
131 | * the window of opportunity to see text mislocated to the RHS of the | |
132 | * console during heavy scrolling activity. However there is the remote | |
133 | * possibility that some pre-dinosaur hardware won't like the back to back | |
134 | * I/O. Since the Xservers get away with it, we should be able to as well. | |
135 | */ | |
136 | static inline void write_vga(unsigned char reg, unsigned int val) | |
137 | { | |
138 | unsigned int v1, v2; | |
139 | unsigned long flags; | |
140 | ||
141 | /* | |
142 | * ddprintk might set the console position from interrupt | |
143 | * handlers, thus the write has to be IRQ-atomic. | |
144 | */ | |
145 | spin_lock_irqsave(&vga_lock, flags); | |
146 | ||
147 | #ifndef SLOW_VGA | |
148 | v1 = reg + (val & 0xff00); | |
149 | v2 = reg + 1 + ((val << 8) & 0xff00); | |
150 | outw(v1, vga_video_port_reg); | |
151 | outw(v2, vga_video_port_reg); | |
152 | #else | |
153 | outb_p(reg, vga_video_port_reg); | |
154 | outb_p(val >> 8, vga_video_port_val); | |
155 | outb_p(reg + 1, vga_video_port_reg); | |
156 | outb_p(val & 0xff, vga_video_port_val); | |
157 | #endif | |
158 | spin_unlock_irqrestore(&vga_lock, flags); | |
159 | } | |
160 | ||
161 | static const char __init *vgacon_startup(void) | |
162 | { | |
163 | const char *display_desc = NULL; | |
164 | u16 saved1, saved2; | |
165 | volatile u16 *p; | |
166 | ||
167 | if (ORIG_VIDEO_ISVGA == VIDEO_TYPE_VLFB) { | |
168 | no_vga: | |
169 | #ifdef CONFIG_DUMMY_CONSOLE | |
170 | conswitchp = &dummy_con; | |
171 | return conswitchp->con_startup(); | |
172 | #else | |
173 | return NULL; | |
174 | #endif | |
175 | } | |
176 | ||
177 | /* VGA16 modes are not handled by VGACON */ | |
178 | if ((ORIG_VIDEO_MODE == 0x0D) || /* 320x200/4 */ | |
179 | (ORIG_VIDEO_MODE == 0x0E) || /* 640x200/4 */ | |
180 | (ORIG_VIDEO_MODE == 0x10) || /* 640x350/4 */ | |
181 | (ORIG_VIDEO_MODE == 0x12) || /* 640x480/4 */ | |
182 | (ORIG_VIDEO_MODE == 0x6A)) /* 800x600/4, 0x6A is very common */ | |
183 | goto no_vga; | |
184 | ||
185 | vga_video_num_lines = ORIG_VIDEO_LINES; | |
186 | vga_video_num_columns = ORIG_VIDEO_COLS; | |
187 | state.vgabase = NULL; | |
188 | ||
189 | if (ORIG_VIDEO_MODE == 7) { /* Is this a monochrome display? */ | |
190 | vga_vram_base = 0xb0000; | |
191 | vga_video_port_reg = VGA_CRT_IM; | |
192 | vga_video_port_val = VGA_CRT_DM; | |
193 | if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) { | |
194 | static struct resource ega_console_resource = | |
195 | { "ega", 0x3B0, 0x3BF }; | |
196 | vga_video_type = VIDEO_TYPE_EGAM; | |
197 | vga_vram_end = 0xb8000; | |
198 | display_desc = "EGA+"; | |
199 | request_resource(&ioport_resource, | |
200 | &ega_console_resource); | |
201 | } else { | |
202 | static struct resource mda1_console_resource = | |
203 | { "mda", 0x3B0, 0x3BB }; | |
204 | static struct resource mda2_console_resource = | |
205 | { "mda", 0x3BF, 0x3BF }; | |
206 | vga_video_type = VIDEO_TYPE_MDA; | |
207 | vga_vram_end = 0xb2000; | |
208 | display_desc = "*MDA"; | |
209 | request_resource(&ioport_resource, | |
210 | &mda1_console_resource); | |
211 | request_resource(&ioport_resource, | |
212 | &mda2_console_resource); | |
213 | vga_video_font_height = 14; | |
214 | } | |
215 | } else { | |
216 | /* If not, it is color. */ | |
217 | vga_can_do_color = 1; | |
218 | vga_vram_base = 0xb8000; | |
219 | vga_video_port_reg = VGA_CRT_IC; | |
220 | vga_video_port_val = VGA_CRT_DC; | |
221 | if ((ORIG_VIDEO_EGA_BX & 0xff) != 0x10) { | |
222 | int i; | |
223 | ||
224 | vga_vram_end = 0xc0000; | |
225 | ||
226 | if (!ORIG_VIDEO_ISVGA) { | |
227 | static struct resource ega_console_resource | |
228 | = { "ega", 0x3C0, 0x3DF }; | |
229 | vga_video_type = VIDEO_TYPE_EGAC; | |
230 | display_desc = "EGA"; | |
231 | request_resource(&ioport_resource, | |
232 | &ega_console_resource); | |
233 | } else { | |
234 | static struct resource vga_console_resource | |
235 | = { "vga+", 0x3C0, 0x3DF }; | |
236 | vga_video_type = VIDEO_TYPE_VGAC; | |
237 | display_desc = "VGA+"; | |
238 | request_resource(&ioport_resource, | |
239 | &vga_console_resource); | |
240 | ||
241 | #ifdef VGA_CAN_DO_64KB | |
242 | /* | |
243 | * get 64K rather than 32K of video RAM. | |
244 | * This doesn't actually work on all "VGA" | |
245 | * controllers (it seems like setting MM=01 | |
246 | * and COE=1 isn't necessarily a good idea) | |
247 | */ | |
248 | vga_vram_base = 0xa0000; | |
249 | vga_vram_end = 0xb0000; | |
250 | outb_p(6, VGA_GFX_I); | |
251 | outb_p(6, VGA_GFX_D); | |
252 | #endif | |
253 | /* | |
254 | * Normalise the palette registers, to point | |
255 | * the 16 screen colours to the first 16 | |
256 | * DAC entries. | |
257 | */ | |
258 | ||
259 | for (i = 0; i < 16; i++) { | |
260 | inb_p(VGA_IS1_RC); | |
261 | outb_p(i, VGA_ATT_W); | |
262 | outb_p(i, VGA_ATT_W); | |
263 | } | |
264 | outb_p(0x20, VGA_ATT_W); | |
265 | ||
266 | /* | |
267 | * Now set the DAC registers back to their | |
268 | * default values | |
269 | */ | |
270 | for (i = 0; i < 16; i++) { | |
271 | outb_p(color_table[i], VGA_PEL_IW); | |
272 | outb_p(default_red[i], VGA_PEL_D); | |
273 | outb_p(default_grn[i], VGA_PEL_D); | |
274 | outb_p(default_blu[i], VGA_PEL_D); | |
275 | } | |
276 | } | |
277 | } else { | |
278 | static struct resource cga_console_resource = | |
279 | { "cga", 0x3D4, 0x3D5 }; | |
280 | vga_video_type = VIDEO_TYPE_CGA; | |
281 | vga_vram_end = 0xba000; | |
282 | display_desc = "*CGA"; | |
283 | request_resource(&ioport_resource, | |
284 | &cga_console_resource); | |
285 | vga_video_font_height = 8; | |
286 | } | |
287 | } | |
288 | ||
289 | vga_vram_base = VGA_MAP_MEM(vga_vram_base); | |
290 | vga_vram_end = VGA_MAP_MEM(vga_vram_end); | |
291 | ||
292 | /* | |
293 | * Find out if there is a graphics card present. | |
294 | * Are there smarter methods around? | |
295 | */ | |
296 | p = (volatile u16 *) vga_vram_base; | |
297 | saved1 = scr_readw(p); | |
298 | saved2 = scr_readw(p + 1); | |
299 | scr_writew(0xAA55, p); | |
300 | scr_writew(0x55AA, p + 1); | |
301 | if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) { | |
302 | scr_writew(saved1, p); | |
303 | scr_writew(saved2, p + 1); | |
304 | goto no_vga; | |
305 | } | |
306 | scr_writew(0x55AA, p); | |
307 | scr_writew(0xAA55, p + 1); | |
308 | if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) { | |
309 | scr_writew(saved1, p); | |
310 | scr_writew(saved2, p + 1); | |
311 | goto no_vga; | |
312 | } | |
313 | scr_writew(saved1, p); | |
314 | scr_writew(saved2, p + 1); | |
315 | ||
316 | if (vga_video_type == VIDEO_TYPE_EGAC | |
317 | || vga_video_type == VIDEO_TYPE_VGAC | |
318 | || vga_video_type == VIDEO_TYPE_EGAM) { | |
319 | vga_hardscroll_enabled = vga_hardscroll_user_enable; | |
320 | vga_default_font_height = ORIG_VIDEO_POINTS; | |
321 | vga_video_font_height = ORIG_VIDEO_POINTS; | |
322 | /* This may be suboptimal but is a safe bet - go with it */ | |
323 | vga_scan_lines = | |
324 | vga_video_font_height * vga_video_num_lines; | |
325 | } | |
326 | return display_desc; | |
327 | } | |
328 | ||
329 | static void vgacon_init(struct vc_data *c, int init) | |
330 | { | |
331 | unsigned long p; | |
332 | ||
333 | /* We cannot be loaded as a module, therefore init is always 1 */ | |
334 | c->vc_can_do_color = vga_can_do_color; | |
335 | c->vc_cols = vga_video_num_columns; | |
336 | c->vc_rows = vga_video_num_lines; | |
337 | c->vc_scan_lines = vga_scan_lines; | |
338 | c->vc_font.height = vga_video_font_height; | |
339 | c->vc_complement_mask = 0x7700; | |
340 | p = *c->vc_uni_pagedir_loc; | |
341 | if (c->vc_uni_pagedir_loc == &c->vc_uni_pagedir || | |
342 | !--c->vc_uni_pagedir_loc[1]) | |
343 | con_free_unimap(c); | |
344 | c->vc_uni_pagedir_loc = vgacon_uni_pagedir; | |
345 | vgacon_uni_pagedir[1]++; | |
346 | if (!vgacon_uni_pagedir[0] && p) | |
347 | con_set_default_unimap(c); | |
348 | } | |
349 | ||
350 | static inline void vga_set_mem_top(struct vc_data *c) | |
351 | { | |
352 | write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2); | |
353 | } | |
354 | ||
355 | static void vgacon_deinit(struct vc_data *c) | |
356 | { | |
357 | /* When closing the last console, reset video origin */ | |
358 | if (!--vgacon_uni_pagedir[1]) { | |
359 | c->vc_visible_origin = vga_vram_base; | |
360 | vga_set_mem_top(c); | |
361 | con_free_unimap(c); | |
362 | } | |
363 | c->vc_uni_pagedir_loc = &c->vc_uni_pagedir; | |
364 | con_set_default_unimap(c); | |
365 | } | |
366 | ||
367 | static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity, | |
368 | u8 blink, u8 underline, u8 reverse) | |
369 | { | |
370 | u8 attr = color; | |
371 | ||
372 | if (vga_can_do_color) { | |
373 | if (underline) | |
374 | attr = (attr & 0xf0) | c->vc_ulcolor; | |
375 | else if (intensity == 0) | |
376 | attr = (attr & 0xf0) | c->vc_halfcolor; | |
377 | } | |
378 | if (reverse) | |
379 | attr = | |
380 | ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) & | |
381 | 0x77); | |
382 | if (blink) | |
383 | attr ^= 0x80; | |
384 | if (intensity == 2) | |
385 | attr ^= 0x08; | |
386 | if (!vga_can_do_color) { | |
387 | if (underline) | |
388 | attr = (attr & 0xf8) | 0x01; | |
389 | else if (intensity == 0) | |
390 | attr = (attr & 0xf0) | 0x08; | |
391 | } | |
392 | return attr; | |
393 | } | |
394 | ||
395 | static void vgacon_invert_region(struct vc_data *c, u16 * p, int count) | |
396 | { | |
397 | int col = vga_can_do_color; | |
398 | ||
399 | while (count--) { | |
400 | u16 a = scr_readw(p); | |
401 | if (col) | |
402 | a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | | |
403 | (((a) & 0x0700) << 4); | |
404 | else | |
405 | a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700; | |
406 | scr_writew(a, p++); | |
407 | } | |
408 | } | |
409 | ||
410 | static void vgacon_set_cursor_size(int xpos, int from, int to) | |
411 | { | |
412 | unsigned long flags; | |
413 | int curs, cure; | |
414 | ||
415 | #ifdef TRIDENT_GLITCH | |
416 | if (xpos < 16) | |
417 | from--, to--; | |
418 | #endif | |
419 | ||
420 | if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto)) | |
421 | return; | |
422 | cursor_size_lastfrom = from; | |
423 | cursor_size_lastto = to; | |
424 | ||
425 | spin_lock_irqsave(&vga_lock, flags); | |
426 | outb_p(0x0a, vga_video_port_reg); /* Cursor start */ | |
427 | curs = inb_p(vga_video_port_val); | |
428 | outb_p(0x0b, vga_video_port_reg); /* Cursor end */ | |
429 | cure = inb_p(vga_video_port_val); | |
430 | ||
431 | curs = (curs & 0xc0) | from; | |
432 | cure = (cure & 0xe0) | to; | |
433 | ||
434 | outb_p(0x0a, vga_video_port_reg); /* Cursor start */ | |
435 | outb_p(curs, vga_video_port_val); | |
436 | outb_p(0x0b, vga_video_port_reg); /* Cursor end */ | |
437 | outb_p(cure, vga_video_port_val); | |
438 | spin_unlock_irqrestore(&vga_lock, flags); | |
439 | } | |
440 | ||
441 | static void vgacon_cursor(struct vc_data *c, int mode) | |
442 | { | |
443 | if (c->vc_origin != c->vc_visible_origin) | |
444 | vgacon_scrolldelta(c, 0); | |
445 | switch (mode) { | |
446 | case CM_ERASE: | |
447 | write_vga(14, (vga_vram_end - vga_vram_base - 1) / 2); | |
448 | break; | |
449 | ||
450 | case CM_MOVE: | |
451 | case CM_DRAW: | |
452 | write_vga(14, (c->vc_pos - vga_vram_base) / 2); | |
453 | switch (c->vc_cursor_type & 0x0f) { | |
454 | case CUR_UNDERLINE: | |
455 | vgacon_set_cursor_size(c->vc_x, | |
456 | c->vc_font.height - | |
457 | (c->vc_font.height < | |
458 | 10 ? 2 : 3), | |
459 | c->vc_font.height - | |
460 | (c->vc_font.height < | |
461 | 10 ? 1 : 2)); | |
462 | break; | |
463 | case CUR_TWO_THIRDS: | |
464 | vgacon_set_cursor_size(c->vc_x, | |
465 | c->vc_font.height / 3, | |
466 | c->vc_font.height - | |
467 | (c->vc_font.height < | |
468 | 10 ? 1 : 2)); | |
469 | break; | |
470 | case CUR_LOWER_THIRD: | |
471 | vgacon_set_cursor_size(c->vc_x, | |
472 | (c->vc_font.height * 2) / 3, | |
473 | c->vc_font.height - | |
474 | (c->vc_font.height < | |
475 | 10 ? 1 : 2)); | |
476 | break; | |
477 | case CUR_LOWER_HALF: | |
478 | vgacon_set_cursor_size(c->vc_x, | |
479 | c->vc_font.height / 2, | |
480 | c->vc_font.height - | |
481 | (c->vc_font.height < | |
482 | 10 ? 1 : 2)); | |
483 | break; | |
484 | case CUR_NONE: | |
485 | vgacon_set_cursor_size(c->vc_x, 31, 30); | |
486 | break; | |
487 | default: | |
488 | vgacon_set_cursor_size(c->vc_x, 1, | |
489 | c->vc_font.height); | |
490 | break; | |
491 | } | |
492 | break; | |
493 | } | |
494 | } | |
495 | ||
496 | static int vgacon_switch(struct vc_data *c) | |
497 | { | |
498 | /* | |
499 | * We need to save screen size here as it's the only way | |
500 | * we can spot the screen has been resized and we need to | |
501 | * set size of freshly allocated screens ourselves. | |
502 | */ | |
503 | vga_video_num_columns = c->vc_cols; | |
504 | vga_video_num_lines = c->vc_rows; | |
505 | if (!vga_is_gfx) | |
506 | scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf, | |
507 | c->vc_screenbuf_size); | |
508 | return 0; /* Redrawing not needed */ | |
509 | } | |
510 | ||
511 | static void vga_set_palette(struct vc_data *vc, unsigned char *table) | |
512 | { | |
513 | int i, j; | |
514 | ||
515 | for (i = j = 0; i < 16; i++) { | |
516 | vga_w(state.vgabase, VGA_PEL_IW, table[i]); | |
517 | vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); | |
518 | vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); | |
519 | vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); | |
520 | } | |
521 | } | |
522 | ||
523 | static int vgacon_set_palette(struct vc_data *vc, unsigned char *table) | |
524 | { | |
525 | #ifdef CAN_LOAD_PALETTE | |
526 | if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked | |
527 | || !CON_IS_VISIBLE(vc)) | |
528 | return -EINVAL; | |
529 | vga_set_palette(vc, table); | |
530 | return 0; | |
531 | #else | |
532 | return -EINVAL; | |
533 | #endif | |
534 | } | |
535 | ||
536 | /* structure holding original VGA register settings */ | |
537 | static struct { | |
538 | unsigned char SeqCtrlIndex; /* Sequencer Index reg. */ | |
539 | unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */ | |
540 | unsigned char CrtMiscIO; /* Miscellaneous register */ | |
541 | unsigned char HorizontalTotal; /* CRT-Controller:00h */ | |
542 | unsigned char HorizDisplayEnd; /* CRT-Controller:01h */ | |
543 | unsigned char StartHorizRetrace; /* CRT-Controller:04h */ | |
544 | unsigned char EndHorizRetrace; /* CRT-Controller:05h */ | |
545 | unsigned char Overflow; /* CRT-Controller:07h */ | |
546 | unsigned char StartVertRetrace; /* CRT-Controller:10h */ | |
547 | unsigned char EndVertRetrace; /* CRT-Controller:11h */ | |
548 | unsigned char ModeControl; /* CRT-Controller:17h */ | |
549 | unsigned char ClockingMode; /* Seq-Controller:01h */ | |
550 | } vga_state; | |
551 | ||
552 | static void vga_vesa_blank(struct vgastate *state, int mode) | |
553 | { | |
554 | /* save original values of VGA controller registers */ | |
555 | if (!vga_vesa_blanked) { | |
556 | spin_lock_irq(&vga_lock); | |
557 | vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I); | |
558 | vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg); | |
559 | vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R); | |
560 | spin_unlock_irq(&vga_lock); | |
561 | ||
562 | outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ | |
563 | vga_state.HorizontalTotal = inb_p(vga_video_port_val); | |
564 | outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ | |
565 | vga_state.HorizDisplayEnd = inb_p(vga_video_port_val); | |
566 | outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ | |
567 | vga_state.StartHorizRetrace = inb_p(vga_video_port_val); | |
568 | outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ | |
569 | vga_state.EndHorizRetrace = inb_p(vga_video_port_val); | |
570 | outb_p(0x07, vga_video_port_reg); /* Overflow */ | |
571 | vga_state.Overflow = inb_p(vga_video_port_val); | |
572 | outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ | |
573 | vga_state.StartVertRetrace = inb_p(vga_video_port_val); | |
574 | outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ | |
575 | vga_state.EndVertRetrace = inb_p(vga_video_port_val); | |
576 | outb_p(0x17, vga_video_port_reg); /* ModeControl */ | |
577 | vga_state.ModeControl = inb_p(vga_video_port_val); | |
578 | vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); | |
579 | } | |
580 | ||
581 | /* assure that video is enabled */ | |
582 | /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */ | |
583 | spin_lock_irq(&vga_lock); | |
584 | vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20); | |
585 | ||
586 | /* test for vertical retrace in process.... */ | |
587 | if ((vga_state.CrtMiscIO & 0x80) == 0x80) | |
588 | vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF); | |
589 | ||
590 | /* | |
591 | * Set <End of vertical retrace> to minimum (0) and | |
592 | * <Start of vertical Retrace> to maximum (incl. overflow) | |
593 | * Result: turn off vertical sync (VSync) pulse. | |
594 | */ | |
595 | if (mode & VESA_VSYNC_SUSPEND) { | |
596 | outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ | |
597 | outb_p(0xff, vga_video_port_val); /* maximum value */ | |
598 | outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ | |
599 | outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */ | |
600 | outb_p(0x07, vga_video_port_reg); /* Overflow */ | |
601 | outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */ | |
602 | } | |
603 | ||
604 | if (mode & VESA_HSYNC_SUSPEND) { | |
605 | /* | |
606 | * Set <End of horizontal retrace> to minimum (0) and | |
607 | * <Start of horizontal Retrace> to maximum | |
608 | * Result: turn off horizontal sync (HSync) pulse. | |
609 | */ | |
610 | outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ | |
611 | outb_p(0xff, vga_video_port_val); /* maximum */ | |
612 | outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ | |
613 | outb_p(0x00, vga_video_port_val); /* minimum (0) */ | |
614 | } | |
615 | ||
616 | /* restore both index registers */ | |
617 | vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); | |
618 | outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); | |
619 | spin_unlock_irq(&vga_lock); | |
620 | } | |
621 | ||
622 | static void vga_vesa_unblank(struct vgastate *state) | |
623 | { | |
624 | /* restore original values of VGA controller registers */ | |
625 | spin_lock_irq(&vga_lock); | |
626 | vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO); | |
627 | ||
628 | outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ | |
629 | outb_p(vga_state.HorizontalTotal, vga_video_port_val); | |
630 | outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ | |
631 | outb_p(vga_state.HorizDisplayEnd, vga_video_port_val); | |
632 | outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ | |
633 | outb_p(vga_state.StartHorizRetrace, vga_video_port_val); | |
634 | outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ | |
635 | outb_p(vga_state.EndHorizRetrace, vga_video_port_val); | |
636 | outb_p(0x07, vga_video_port_reg); /* Overflow */ | |
637 | outb_p(vga_state.Overflow, vga_video_port_val); | |
638 | outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ | |
639 | outb_p(vga_state.StartVertRetrace, vga_video_port_val); | |
640 | outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ | |
641 | outb_p(vga_state.EndVertRetrace, vga_video_port_val); | |
642 | outb_p(0x17, vga_video_port_reg); /* ModeControl */ | |
643 | outb_p(vga_state.ModeControl, vga_video_port_val); | |
644 | /* ClockingMode */ | |
645 | vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode); | |
646 | ||
647 | /* restore index/control registers */ | |
648 | vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); | |
649 | outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); | |
650 | spin_unlock_irq(&vga_lock); | |
651 | } | |
652 | ||
653 | static void vga_pal_blank(struct vgastate *state) | |
654 | { | |
655 | int i; | |
656 | ||
657 | for (i = 0; i < 16; i++) { | |
658 | vga_w(state->vgabase, VGA_PEL_IW, i); | |
659 | vga_w(state->vgabase, VGA_PEL_D, 0); | |
660 | vga_w(state->vgabase, VGA_PEL_D, 0); | |
661 | vga_w(state->vgabase, VGA_PEL_D, 0); | |
662 | } | |
663 | } | |
664 | ||
665 | static int vgacon_blank(struct vc_data *c, int blank, int mode_switch) | |
666 | { | |
667 | switch (blank) { | |
668 | case 0: /* Unblank */ | |
669 | if (vga_vesa_blanked) { | |
670 | vga_vesa_unblank(&state); | |
671 | vga_vesa_blanked = 0; | |
672 | } | |
673 | if (vga_palette_blanked) { | |
674 | vga_set_palette(c, color_table); | |
675 | vga_palette_blanked = 0; | |
676 | return 0; | |
677 | } | |
678 | vga_is_gfx = 0; | |
679 | /* Tell console.c that it has to restore the screen itself */ | |
680 | return 1; | |
681 | case 1: /* Normal blanking */ | |
682 | case -1: /* Obsolete */ | |
683 | if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) { | |
684 | vga_pal_blank(&state); | |
685 | vga_palette_blanked = 1; | |
686 | return 0; | |
687 | } | |
688 | vgacon_set_origin(c); | |
689 | scr_memsetw((void *) vga_vram_base, BLANK, | |
690 | c->vc_screenbuf_size); | |
691 | if (mode_switch) | |
692 | vga_is_gfx = 1; | |
693 | return 1; | |
694 | default: /* VESA blanking */ | |
695 | if (vga_video_type == VIDEO_TYPE_VGAC) { | |
696 | vga_vesa_blank(&state, blank - 1); | |
697 | vga_vesa_blanked = blank; | |
698 | } | |
699 | return 0; | |
700 | } | |
701 | } | |
702 | ||
703 | /* | |
704 | * PIO_FONT support. | |
705 | * | |
706 | * The font loading code goes back to the codepage package by | |
707 | * Joel Hoffman (joel@wam.umd.edu). (He reports that the original | |
708 | * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2 | |
709 | * Video Systems_ by Richard Wilton. 1987. Microsoft Press".) | |
710 | * | |
711 | * Change for certain monochrome monitors by Yury Shevchuck | |
712 | * (sizif@botik.yaroslavl.su). | |
713 | */ | |
714 | ||
715 | #ifdef CAN_LOAD_EGA_FONTS | |
716 | ||
717 | #define colourmap 0xa0000 | |
718 | /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we | |
719 | should use 0xA0000 for the bwmap as well.. */ | |
720 | #define blackwmap 0xa0000 | |
721 | #define cmapsz 8192 | |
722 | ||
723 | static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) | |
724 | { | |
725 | unsigned short video_port_status = vga_video_port_reg + 6; | |
726 | int font_select = 0x00, beg, i; | |
727 | char *charmap; | |
728 | ||
729 | if (vga_video_type != VIDEO_TYPE_EGAM) { | |
730 | charmap = (char *) VGA_MAP_MEM(colourmap); | |
731 | beg = 0x0e; | |
732 | #ifdef VGA_CAN_DO_64KB | |
733 | if (vga_video_type == VIDEO_TYPE_VGAC) | |
734 | beg = 0x06; | |
735 | #endif | |
736 | } else { | |
737 | charmap = (char *) VGA_MAP_MEM(blackwmap); | |
738 | beg = 0x0a; | |
739 | } | |
740 | ||
741 | #ifdef BROKEN_GRAPHICS_PROGRAMS | |
742 | /* | |
743 | * All fonts are loaded in slot 0 (0:1 for 512 ch) | |
744 | */ | |
745 | ||
746 | if (!arg) | |
747 | return -EINVAL; /* Return to default font not supported */ | |
748 | ||
749 | vga_font_is_default = 0; | |
750 | font_select = ch512 ? 0x04 : 0x00; | |
751 | #else | |
752 | /* | |
753 | * The default font is kept in slot 0 and is never touched. | |
754 | * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch) | |
755 | */ | |
756 | ||
757 | if (set) { | |
758 | vga_font_is_default = !arg; | |
759 | if (!arg) | |
760 | ch512 = 0; /* Default font is always 256 */ | |
761 | font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00; | |
762 | } | |
763 | ||
764 | if (!vga_font_is_default) | |
765 | charmap += 4 * cmapsz; | |
766 | #endif | |
767 | ||
768 | unlock_kernel(); | |
769 | spin_lock_irq(&vga_lock); | |
770 | /* First, the Sequencer */ | |
771 | vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); | |
772 | /* CPU writes only to map 2 */ | |
773 | vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04); | |
774 | /* Sequential addressing */ | |
775 | vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07); | |
776 | /* Clear synchronous reset */ | |
777 | vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); | |
778 | ||
779 | /* Now, the graphics controller, select map 2 */ | |
780 | vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02); | |
781 | /* disable odd-even addressing */ | |
782 | vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00); | |
783 | /* map start at A000:0000 */ | |
784 | vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00); | |
785 | spin_unlock_irq(&vga_lock); | |
786 | ||
787 | if (arg) { | |
788 | if (set) | |
789 | for (i = 0; i < cmapsz; i++) | |
790 | vga_writeb(arg[i], charmap + i); | |
791 | else | |
792 | for (i = 0; i < cmapsz; i++) | |
793 | arg[i] = vga_readb(charmap + i); | |
794 | ||
795 | /* | |
796 | * In 512-character mode, the character map is not contiguous if | |
797 | * we want to remain EGA compatible -- which we do | |
798 | */ | |
799 | ||
800 | if (ch512) { | |
801 | charmap += 2 * cmapsz; | |
802 | arg += cmapsz; | |
803 | if (set) | |
804 | for (i = 0; i < cmapsz; i++) | |
805 | vga_writeb(arg[i], charmap + i); | |
806 | else | |
807 | for (i = 0; i < cmapsz; i++) | |
808 | arg[i] = vga_readb(charmap + i); | |
809 | } | |
810 | } | |
811 | ||
812 | spin_lock_irq(&vga_lock); | |
813 | /* First, the sequencer, Synchronous reset */ | |
814 | vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01); | |
815 | /* CPU writes to maps 0 and 1 */ | |
816 | vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03); | |
817 | /* odd-even addressing */ | |
818 | vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03); | |
819 | /* Character Map Select */ | |
820 | if (set) | |
821 | vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select); | |
822 | /* clear synchronous reset */ | |
823 | vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); | |
824 | ||
825 | /* Now, the graphics controller, select map 0 for CPU */ | |
826 | vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00); | |
827 | /* enable even-odd addressing */ | |
828 | vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10); | |
829 | /* map starts at b800:0 or b000:0 */ | |
830 | vga_wgfx(state->vgabase, VGA_GFX_MISC, beg); | |
831 | ||
832 | /* if 512 char mode is already enabled don't re-enable it. */ | |
833 | if ((set) && (ch512 != vga_512_chars)) { | |
834 | int i; | |
835 | ||
836 | /* attribute controller */ | |
837 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
838 | struct vc_data *c = vc_cons[i].d; | |
839 | if (c && c->vc_sw == &vga_con) | |
840 | c->vc_hi_font_mask = ch512 ? 0x0800 : 0; | |
841 | } | |
842 | vga_512_chars = ch512; | |
843 | /* 256-char: enable intensity bit | |
844 | 512-char: disable intensity bit */ | |
845 | inb_p(video_port_status); /* clear address flip-flop */ | |
846 | /* color plane enable register */ | |
847 | vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f); | |
848 | /* Wilton (1987) mentions the following; I don't know what | |
849 | it means, but it works, and it appears necessary */ | |
850 | inb_p(video_port_status); | |
851 | vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0); | |
852 | } | |
853 | spin_unlock_irq(&vga_lock); | |
854 | lock_kernel(); | |
855 | return 0; | |
856 | } | |
857 | ||
858 | /* | |
859 | * Adjust the screen to fit a font of a certain height | |
860 | */ | |
861 | static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) | |
862 | { | |
863 | unsigned char ovr, vde, fsr; | |
864 | int rows, maxscan, i; | |
865 | ||
866 | rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */ | |
867 | maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */ | |
868 | ||
869 | /* Reprogram the CRTC for the new font size | |
870 | Note: the attempt to read the overflow register will fail | |
871 | on an EGA, but using 0xff for the previous value appears to | |
872 | be OK for EGA text modes in the range 257-512 scan lines, so I | |
873 | guess we don't need to worry about it. | |
874 | ||
875 | The same applies for the spill bits in the font size and cursor | |
876 | registers; they are write-only on EGA, but it appears that they | |
877 | are all don't care bits on EGA, so I guess it doesn't matter. */ | |
878 | ||
879 | spin_lock_irq(&vga_lock); | |
880 | outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ | |
881 | ovr = inb_p(vga_video_port_val); | |
882 | outb_p(0x09, vga_video_port_reg); /* Font size register */ | |
883 | fsr = inb_p(vga_video_port_val); | |
884 | spin_unlock_irq(&vga_lock); | |
885 | ||
886 | vde = maxscan & 0xff; /* Vertical display end reg */ | |
887 | ovr = (ovr & 0xbd) + /* Overflow register */ | |
888 | ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3); | |
889 | fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */ | |
890 | ||
891 | spin_lock_irq(&vga_lock); | |
892 | outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ | |
893 | outb_p(ovr, vga_video_port_val); | |
894 | outb_p(0x09, vga_video_port_reg); /* Font size */ | |
895 | outb_p(fsr, vga_video_port_val); | |
896 | outb_p(0x12, vga_video_port_reg); /* Vertical display limit */ | |
897 | outb_p(vde, vga_video_port_val); | |
898 | spin_unlock_irq(&vga_lock); | |
899 | ||
900 | for (i = 0; i < MAX_NR_CONSOLES; i++) { | |
901 | struct vc_data *c = vc_cons[i].d; | |
902 | ||
903 | if (c && c->vc_sw == &vga_con) { | |
904 | if (CON_IS_VISIBLE(c)) { | |
905 | /* void size to cause regs to be rewritten */ | |
906 | cursor_size_lastfrom = 0; | |
907 | cursor_size_lastto = 0; | |
908 | c->vc_sw->con_cursor(c, CM_DRAW); | |
909 | } | |
910 | c->vc_font.height = fontheight; | |
911 | vc_resize(c, 0, rows); /* Adjust console size */ | |
912 | } | |
913 | } | |
914 | return 0; | |
915 | } | |
916 | ||
917 | static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags) | |
918 | { | |
919 | unsigned charcount = font->charcount; | |
920 | int rc; | |
921 | ||
922 | if (vga_video_type < VIDEO_TYPE_EGAM) | |
923 | return -EINVAL; | |
924 | ||
925 | if (font->width != 8 || (charcount != 256 && charcount != 512)) | |
926 | return -EINVAL; | |
927 | ||
928 | rc = vgacon_do_font_op(&state, font->data, 1, charcount == 512); | |
929 | if (rc) | |
930 | return rc; | |
931 | ||
932 | if (!(flags & KD_FONT_FLAG_DONT_RECALC)) | |
933 | rc = vgacon_adjust_height(c, font->height); | |
934 | return rc; | |
935 | } | |
936 | ||
937 | static int vgacon_font_get(struct vc_data *c, struct console_font *font) | |
938 | { | |
939 | if (vga_video_type < VIDEO_TYPE_EGAM) | |
940 | return -EINVAL; | |
941 | ||
942 | font->width = 8; | |
943 | font->height = c->vc_font.height; | |
944 | font->charcount = vga_512_chars ? 512 : 256; | |
945 | if (!font->data) | |
946 | return 0; | |
947 | return vgacon_do_font_op(&state, font->data, 0, 0); | |
948 | } | |
949 | ||
950 | #else | |
951 | ||
952 | #define vgacon_font_set NULL | |
953 | #define vgacon_font_get NULL | |
954 | ||
955 | #endif | |
956 | ||
957 | static int vgacon_scrolldelta(struct vc_data *c, int lines) | |
958 | { | |
959 | if (!lines) /* Turn scrollback off */ | |
960 | c->vc_visible_origin = c->vc_origin; | |
961 | else { | |
962 | int vram_size = vga_vram_end - vga_vram_base; | |
963 | int margin = c->vc_size_row * 4; | |
964 | int ul, we, p, st; | |
965 | ||
966 | if (vga_rolled_over > | |
967 | (c->vc_scr_end - vga_vram_base) + margin) { | |
968 | ul = c->vc_scr_end - vga_vram_base; | |
969 | we = vga_rolled_over + c->vc_size_row; | |
970 | } else { | |
971 | ul = 0; | |
972 | we = vram_size; | |
973 | } | |
974 | p = (c->vc_visible_origin - vga_vram_base - ul + we) % we + | |
975 | lines * c->vc_size_row; | |
976 | st = (c->vc_origin - vga_vram_base - ul + we) % we; | |
977 | if (st < 2 * margin) | |
978 | margin = 0; | |
979 | if (p < margin) | |
980 | p = 0; | |
981 | if (p > st - margin) | |
982 | p = st; | |
983 | c->vc_visible_origin = vga_vram_base + (p + ul) % we; | |
984 | } | |
985 | vga_set_mem_top(c); | |
986 | return 1; | |
987 | } | |
988 | ||
989 | static int vgacon_set_origin(struct vc_data *c) | |
990 | { | |
991 | if (vga_is_gfx || /* We don't play origin tricks in graphic modes */ | |
992 | (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */ | |
993 | return 0; | |
994 | c->vc_origin = c->vc_visible_origin = vga_vram_base; | |
995 | vga_set_mem_top(c); | |
996 | vga_rolled_over = 0; | |
997 | return 1; | |
998 | } | |
999 | ||
1000 | static void vgacon_save_screen(struct vc_data *c) | |
1001 | { | |
1002 | static int vga_bootup_console = 0; | |
1003 | ||
1004 | if (!vga_bootup_console) { | |
1005 | /* This is a gross hack, but here is the only place we can | |
1006 | * set bootup console parameters without messing up generic | |
1007 | * console initialization routines. | |
1008 | */ | |
1009 | vga_bootup_console = 1; | |
1010 | c->vc_x = ORIG_X; | |
1011 | c->vc_y = ORIG_Y; | |
1012 | } | |
1013 | if (!vga_is_gfx) | |
1014 | scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin, | |
1015 | c->vc_screenbuf_size); | |
1016 | } | |
1017 | ||
1018 | static int vgacon_scroll(struct vc_data *c, int t, int b, int dir, | |
1019 | int lines) | |
1020 | { | |
1021 | unsigned long oldo; | |
1022 | unsigned int delta; | |
1023 | ||
1024 | if (t || b != c->vc_rows || vga_is_gfx) | |
1025 | return 0; | |
1026 | ||
1027 | if (c->vc_origin != c->vc_visible_origin) | |
1028 | vgacon_scrolldelta(c, 0); | |
1029 | ||
1030 | if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2) | |
1031 | return 0; | |
1032 | ||
1033 | oldo = c->vc_origin; | |
1034 | delta = lines * c->vc_size_row; | |
1035 | if (dir == SM_UP) { | |
1036 | if (c->vc_scr_end + delta >= vga_vram_end) { | |
1037 | scr_memcpyw((u16 *) vga_vram_base, | |
1038 | (u16 *) (oldo + delta), | |
1039 | c->vc_screenbuf_size - delta); | |
1040 | c->vc_origin = vga_vram_base; | |
1041 | vga_rolled_over = oldo - vga_vram_base; | |
1042 | } else | |
1043 | c->vc_origin += delta; | |
1044 | scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size - | |
1045 | delta), c->vc_video_erase_char, | |
1046 | delta); | |
1047 | } else { | |
1048 | if (oldo - delta < vga_vram_base) { | |
1049 | scr_memmovew((u16 *) (vga_vram_end - | |
1050 | c->vc_screenbuf_size + | |
1051 | delta), (u16 *) oldo, | |
1052 | c->vc_screenbuf_size - delta); | |
1053 | c->vc_origin = vga_vram_end - c->vc_screenbuf_size; | |
1054 | vga_rolled_over = 0; | |
1055 | } else | |
1056 | c->vc_origin -= delta; | |
1057 | c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; | |
1058 | scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char, | |
1059 | delta); | |
1060 | } | |
1061 | c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; | |
1062 | c->vc_visible_origin = c->vc_origin; | |
1063 | vga_set_mem_top(c); | |
1064 | c->vc_pos = (c->vc_pos - oldo) + c->vc_origin; | |
1065 | return 1; | |
1066 | } | |
1067 | ||
1068 | ||
1069 | /* | |
1070 | * The console `switch' structure for the VGA based console | |
1071 | */ | |
1072 | ||
1073 | static int vgacon_dummy(struct vc_data *c) | |
1074 | { | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | #define DUMMY (void *) vgacon_dummy | |
1079 | ||
1080 | const struct consw vga_con = { | |
1081 | .owner = THIS_MODULE, | |
1082 | .con_startup = vgacon_startup, | |
1083 | .con_init = vgacon_init, | |
1084 | .con_deinit = vgacon_deinit, | |
1085 | .con_clear = DUMMY, | |
1086 | .con_putc = DUMMY, | |
1087 | .con_putcs = DUMMY, | |
1088 | .con_cursor = vgacon_cursor, | |
1089 | .con_scroll = vgacon_scroll, | |
1090 | .con_bmove = DUMMY, | |
1091 | .con_switch = vgacon_switch, | |
1092 | .con_blank = vgacon_blank, | |
1093 | .con_font_set = vgacon_font_set, | |
1094 | .con_font_get = vgacon_font_get, | |
1095 | .con_set_palette = vgacon_set_palette, | |
1096 | .con_scrolldelta = vgacon_scrolldelta, | |
1097 | .con_set_origin = vgacon_set_origin, | |
1098 | .con_save_screen = vgacon_save_screen, | |
1099 | .con_build_attr = vgacon_build_attr, | |
1100 | .con_invert_region = vgacon_invert_region, | |
1101 | }; | |
1102 | ||
1103 | MODULE_LICENSE("GPL"); |