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/module.h> 37 #include <linux/types.h> 38 #include <linux/fs.h> 39 #include <linux/kernel.h> 40 #include <linux/console.h> 41 #include <linux/string.h> 42 #include <linux/kd.h> 43 #include <linux/slab.h> 44 #include <linux/vt_kern.h> 45 #include <linux/selection.h> 46 #include <linux/spinlock.h> 47 #include <linux/ioport.h> 48 #include <linux/init.h> 49 #include <linux/screen_info.h> 50 #include <linux/smp_lock.h> 51 #include <video/vga.h> 52 #include <asm/io.h> 53 54 static DEFINE_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 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 #define VGA_FONTWIDTH 8 /* VGA does not support fontwidths != 8 */ 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 void vgacon_invert_region(struct vc_data *c, u16 * p, int count); 90 static unsigned long vgacon_uni_pagedir[2]; 91 92 /* Description of the hardware situation */ 93 static int vga_init_done __read_mostly; 94 static unsigned long vga_vram_base __read_mostly; /* Base of video memory */ 95 static unsigned long vga_vram_end __read_mostly; /* End of video memory */ 96 static unsigned int vga_vram_size __read_mostly; /* Size of video memory */ 97 static u16 vga_video_port_reg __read_mostly; /* Video register select port */ 98 static u16 vga_video_port_val __read_mostly; /* Video register value port */ 99 static unsigned int vga_video_num_columns; /* Number of text columns */ 100 static unsigned int vga_video_num_lines; /* Number of text lines */ 101 static int vga_can_do_color __read_mostly; /* Do we support colors? */ 102 static unsigned int vga_default_font_height __read_mostly; /* Height of default screen font */ 103 static unsigned char vga_video_type __read_mostly; /* Card type */ 104 static unsigned char vga_hardscroll_enabled __read_mostly; 105 static unsigned char vga_hardscroll_user_enable __read_mostly = 1; 106 static unsigned char vga_font_is_default = 1; 107 static int vga_vesa_blanked; 108 static int vga_palette_blanked; 109 static int vga_is_gfx; 110 static int vga_512_chars; 111 static int vga_video_font_height; 112 static int vga_scan_lines __read_mostly; 113 static unsigned int vga_rolled_over; 114 115 int vgacon_text_mode_force = 0; 116 117 bool vgacon_text_force(void) 118 { 119 return vgacon_text_mode_force ? true : false; 120 } 121 EXPORT_SYMBOL(vgacon_text_force); 122 123 static int __init text_mode(char *str) 124 { 125 vgacon_text_mode_force = 1; 126 return 1; 127 } 128 129 /* force text mode - used by kernel modesetting */ 130 __setup("nomodeset", text_mode); 131 132 static int __init no_scroll(char *str) 133 { 134 /* 135 * Disabling scrollback is required for the Braillex ib80-piezo 136 * Braille reader made by F.H. Papenmeier (Germany). 137 * Use the "no-scroll" bootflag. 138 */ 139 vga_hardscroll_user_enable = vga_hardscroll_enabled = 0; 140 return 1; 141 } 142 143 __setup("no-scroll", no_scroll); 144 145 /* 146 * By replacing the four outb_p with two back to back outw, we can reduce 147 * the window of opportunity to see text mislocated to the RHS of the 148 * console during heavy scrolling activity. However there is the remote 149 * possibility that some pre-dinosaur hardware won't like the back to back 150 * I/O. Since the Xservers get away with it, we should be able to as well. 151 */ 152 static inline void write_vga(unsigned char reg, unsigned int val) 153 { 154 unsigned int v1, v2; 155 unsigned long flags; 156 157 /* 158 * ddprintk might set the console position from interrupt 159 * handlers, thus the write has to be IRQ-atomic. 160 */ 161 spin_lock_irqsave(&vga_lock, flags); 162 163 #ifndef SLOW_VGA 164 v1 = reg + (val & 0xff00); 165 v2 = reg + 1 + ((val << 8) & 0xff00); 166 outw(v1, vga_video_port_reg); 167 outw(v2, vga_video_port_reg); 168 #else 169 outb_p(reg, vga_video_port_reg); 170 outb_p(val >> 8, vga_video_port_val); 171 outb_p(reg + 1, vga_video_port_reg); 172 outb_p(val & 0xff, vga_video_port_val); 173 #endif 174 spin_unlock_irqrestore(&vga_lock, flags); 175 } 176 177 static inline void vga_set_mem_top(struct vc_data *c) 178 { 179 write_vga(12, (c->vc_visible_origin - vga_vram_base) / 2); 180 } 181 182 #ifdef CONFIG_VGACON_SOFT_SCROLLBACK 183 /* software scrollback */ 184 static void *vgacon_scrollback; 185 static int vgacon_scrollback_tail; 186 static int vgacon_scrollback_size; 187 static int vgacon_scrollback_rows; 188 static int vgacon_scrollback_cnt; 189 static int vgacon_scrollback_cur; 190 static int vgacon_scrollback_save; 191 static int vgacon_scrollback_restore; 192 193 static void vgacon_scrollback_init(int pitch) 194 { 195 int rows = CONFIG_VGACON_SOFT_SCROLLBACK_SIZE * 1024/pitch; 196 197 if (vgacon_scrollback) { 198 vgacon_scrollback_cnt = 0; 199 vgacon_scrollback_tail = 0; 200 vgacon_scrollback_cur = 0; 201 vgacon_scrollback_rows = rows - 1; 202 vgacon_scrollback_size = rows * pitch; 203 } 204 } 205 206 /* 207 * Called only duing init so call of alloc_bootmen is ok. 208 * Marked __init_refok to silence modpost. 209 */ 210 static void __init_refok vgacon_scrollback_startup(void) 211 { 212 vgacon_scrollback = kcalloc(CONFIG_VGACON_SOFT_SCROLLBACK_SIZE, 1024, GFP_NOWAIT); 213 vgacon_scrollback_init(vga_video_num_columns * 2); 214 } 215 216 static void vgacon_scrollback_update(struct vc_data *c, int t, int count) 217 { 218 void *p; 219 220 if (!vgacon_scrollback_size || c->vc_num != fg_console) 221 return; 222 223 p = (void *) (c->vc_origin + t * c->vc_size_row); 224 225 while (count--) { 226 scr_memcpyw(vgacon_scrollback + vgacon_scrollback_tail, 227 p, c->vc_size_row); 228 vgacon_scrollback_cnt++; 229 p += c->vc_size_row; 230 vgacon_scrollback_tail += c->vc_size_row; 231 232 if (vgacon_scrollback_tail >= vgacon_scrollback_size) 233 vgacon_scrollback_tail = 0; 234 235 if (vgacon_scrollback_cnt > vgacon_scrollback_rows) 236 vgacon_scrollback_cnt = vgacon_scrollback_rows; 237 238 vgacon_scrollback_cur = vgacon_scrollback_cnt; 239 } 240 } 241 242 static void vgacon_restore_screen(struct vc_data *c) 243 { 244 vgacon_scrollback_save = 0; 245 246 if (!vga_is_gfx && !vgacon_scrollback_restore) { 247 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf, 248 c->vc_screenbuf_size > vga_vram_size ? 249 vga_vram_size : c->vc_screenbuf_size); 250 vgacon_scrollback_restore = 1; 251 vgacon_scrollback_cur = vgacon_scrollback_cnt; 252 } 253 } 254 255 static int vgacon_scrolldelta(struct vc_data *c, int lines) 256 { 257 int start, end, count, soff; 258 259 if (!lines) { 260 c->vc_visible_origin = c->vc_origin; 261 vga_set_mem_top(c); 262 return 1; 263 } 264 265 if (!vgacon_scrollback) 266 return 1; 267 268 if (!vgacon_scrollback_save) { 269 vgacon_cursor(c, CM_ERASE); 270 vgacon_save_screen(c); 271 vgacon_scrollback_save = 1; 272 } 273 274 vgacon_scrollback_restore = 0; 275 start = vgacon_scrollback_cur + lines; 276 end = start + abs(lines); 277 278 if (start < 0) 279 start = 0; 280 281 if (start > vgacon_scrollback_cnt) 282 start = vgacon_scrollback_cnt; 283 284 if (end < 0) 285 end = 0; 286 287 if (end > vgacon_scrollback_cnt) 288 end = vgacon_scrollback_cnt; 289 290 vgacon_scrollback_cur = start; 291 count = end - start; 292 soff = vgacon_scrollback_tail - ((vgacon_scrollback_cnt - end) * 293 c->vc_size_row); 294 soff -= count * c->vc_size_row; 295 296 if (soff < 0) 297 soff += vgacon_scrollback_size; 298 299 count = vgacon_scrollback_cnt - start; 300 301 if (count > c->vc_rows) 302 count = c->vc_rows; 303 304 if (count) { 305 int copysize; 306 307 int diff = c->vc_rows - count; 308 void *d = (void *) c->vc_origin; 309 void *s = (void *) c->vc_screenbuf; 310 311 count *= c->vc_size_row; 312 /* how much memory to end of buffer left? */ 313 copysize = min(count, vgacon_scrollback_size - soff); 314 scr_memcpyw(d, vgacon_scrollback + soff, copysize); 315 d += copysize; 316 count -= copysize; 317 318 if (count) { 319 scr_memcpyw(d, vgacon_scrollback, count); 320 d += count; 321 } 322 323 if (diff) 324 scr_memcpyw(d, s, diff * c->vc_size_row); 325 } else 326 vgacon_cursor(c, CM_MOVE); 327 328 return 1; 329 } 330 #else 331 #define vgacon_scrollback_startup(...) do { } while (0) 332 #define vgacon_scrollback_init(...) do { } while (0) 333 #define vgacon_scrollback_update(...) do { } while (0) 334 335 static void vgacon_restore_screen(struct vc_data *c) 336 { 337 if (c->vc_origin != c->vc_visible_origin) 338 vgacon_scrolldelta(c, 0); 339 } 340 341 static int vgacon_scrolldelta(struct vc_data *c, int lines) 342 { 343 if (!lines) /* Turn scrollback off */ 344 c->vc_visible_origin = c->vc_origin; 345 else { 346 int margin = c->vc_size_row * 4; 347 int ul, we, p, st; 348 349 if (vga_rolled_over > 350 (c->vc_scr_end - vga_vram_base) + margin) { 351 ul = c->vc_scr_end - vga_vram_base; 352 we = vga_rolled_over + c->vc_size_row; 353 } else { 354 ul = 0; 355 we = vga_vram_size; 356 } 357 p = (c->vc_visible_origin - vga_vram_base - ul + we) % we + 358 lines * c->vc_size_row; 359 st = (c->vc_origin - vga_vram_base - ul + we) % we; 360 if (st < 2 * margin) 361 margin = 0; 362 if (p < margin) 363 p = 0; 364 if (p > st - margin) 365 p = st; 366 c->vc_visible_origin = vga_vram_base + (p + ul) % we; 367 } 368 vga_set_mem_top(c); 369 return 1; 370 } 371 #endif /* CONFIG_VGACON_SOFT_SCROLLBACK */ 372 373 static const char *vgacon_startup(void) 374 { 375 const char *display_desc = NULL; 376 u16 saved1, saved2; 377 volatile u16 *p; 378 379 if (screen_info.orig_video_isVGA == VIDEO_TYPE_VLFB) { 380 no_vga: 381 #ifdef CONFIG_DUMMY_CONSOLE 382 conswitchp = &dummy_con; 383 return conswitchp->con_startup(); 384 #else 385 return NULL; 386 #endif 387 } 388 389 /* boot_params.screen_info initialized? */ 390 if ((screen_info.orig_video_mode == 0) && 391 (screen_info.orig_video_lines == 0) && 392 (screen_info.orig_video_cols == 0)) 393 goto no_vga; 394 395 /* VGA16 modes are not handled by VGACON */ 396 if ((screen_info.orig_video_mode == 0x0D) || /* 320x200/4 */ 397 (screen_info.orig_video_mode == 0x0E) || /* 640x200/4 */ 398 (screen_info.orig_video_mode == 0x10) || /* 640x350/4 */ 399 (screen_info.orig_video_mode == 0x12) || /* 640x480/4 */ 400 (screen_info.orig_video_mode == 0x6A)) /* 800x600/4 (VESA) */ 401 goto no_vga; 402 403 vga_video_num_lines = screen_info.orig_video_lines; 404 vga_video_num_columns = screen_info.orig_video_cols; 405 state.vgabase = NULL; 406 407 if (screen_info.orig_video_mode == 7) { 408 /* Monochrome display */ 409 vga_vram_base = 0xb0000; 410 vga_video_port_reg = VGA_CRT_IM; 411 vga_video_port_val = VGA_CRT_DM; 412 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) { 413 static struct resource ega_console_resource = 414 { .name = "ega", .start = 0x3B0, .end = 0x3BF }; 415 vga_video_type = VIDEO_TYPE_EGAM; 416 vga_vram_size = 0x8000; 417 display_desc = "EGA+"; 418 request_resource(&ioport_resource, 419 &ega_console_resource); 420 } else { 421 static struct resource mda1_console_resource = 422 { .name = "mda", .start = 0x3B0, .end = 0x3BB }; 423 static struct resource mda2_console_resource = 424 { .name = "mda", .start = 0x3BF, .end = 0x3BF }; 425 vga_video_type = VIDEO_TYPE_MDA; 426 vga_vram_size = 0x2000; 427 display_desc = "*MDA"; 428 request_resource(&ioport_resource, 429 &mda1_console_resource); 430 request_resource(&ioport_resource, 431 &mda2_console_resource); 432 vga_video_font_height = 14; 433 } 434 } else { 435 /* If not, it is color. */ 436 vga_can_do_color = 1; 437 vga_vram_base = 0xb8000; 438 vga_video_port_reg = VGA_CRT_IC; 439 vga_video_port_val = VGA_CRT_DC; 440 if ((screen_info.orig_video_ega_bx & 0xff) != 0x10) { 441 int i; 442 443 vga_vram_size = 0x8000; 444 445 if (!screen_info.orig_video_isVGA) { 446 static struct resource ega_console_resource 447 = { .name = "ega", .start = 0x3C0, .end = 0x3DF }; 448 vga_video_type = VIDEO_TYPE_EGAC; 449 display_desc = "EGA"; 450 request_resource(&ioport_resource, 451 &ega_console_resource); 452 } else { 453 static struct resource vga_console_resource 454 = { .name = "vga+", .start = 0x3C0, .end = 0x3DF }; 455 vga_video_type = VIDEO_TYPE_VGAC; 456 display_desc = "VGA+"; 457 request_resource(&ioport_resource, 458 &vga_console_resource); 459 460 #ifdef VGA_CAN_DO_64KB 461 /* 462 * get 64K rather than 32K of video RAM. 463 * This doesn't actually work on all "VGA" 464 * controllers (it seems like setting MM=01 465 * and COE=1 isn't necessarily a good idea) 466 */ 467 vga_vram_base = 0xa0000; 468 vga_vram_size = 0x10000; 469 outb_p(6, VGA_GFX_I); 470 outb_p(6, VGA_GFX_D); 471 #endif 472 /* 473 * Normalise the palette registers, to point 474 * the 16 screen colours to the first 16 475 * DAC entries. 476 */ 477 478 for (i = 0; i < 16; i++) { 479 inb_p(VGA_IS1_RC); 480 outb_p(i, VGA_ATT_W); 481 outb_p(i, VGA_ATT_W); 482 } 483 outb_p(0x20, VGA_ATT_W); 484 485 /* 486 * Now set the DAC registers back to their 487 * default values 488 */ 489 for (i = 0; i < 16; i++) { 490 outb_p(color_table[i], VGA_PEL_IW); 491 outb_p(default_red[i], VGA_PEL_D); 492 outb_p(default_grn[i], VGA_PEL_D); 493 outb_p(default_blu[i], VGA_PEL_D); 494 } 495 } 496 } else { 497 static struct resource cga_console_resource = 498 { .name = "cga", .start = 0x3D4, .end = 0x3D5 }; 499 vga_video_type = VIDEO_TYPE_CGA; 500 vga_vram_size = 0x2000; 501 display_desc = "*CGA"; 502 request_resource(&ioport_resource, 503 &cga_console_resource); 504 vga_video_font_height = 8; 505 } 506 } 507 508 vga_vram_base = VGA_MAP_MEM(vga_vram_base, vga_vram_size); 509 vga_vram_end = vga_vram_base + vga_vram_size; 510 511 /* 512 * Find out if there is a graphics card present. 513 * Are there smarter methods around? 514 */ 515 p = (volatile u16 *) vga_vram_base; 516 saved1 = scr_readw(p); 517 saved2 = scr_readw(p + 1); 518 scr_writew(0xAA55, p); 519 scr_writew(0x55AA, p + 1); 520 if (scr_readw(p) != 0xAA55 || scr_readw(p + 1) != 0x55AA) { 521 scr_writew(saved1, p); 522 scr_writew(saved2, p + 1); 523 goto no_vga; 524 } 525 scr_writew(0x55AA, p); 526 scr_writew(0xAA55, p + 1); 527 if (scr_readw(p) != 0x55AA || scr_readw(p + 1) != 0xAA55) { 528 scr_writew(saved1, p); 529 scr_writew(saved2, p + 1); 530 goto no_vga; 531 } 532 scr_writew(saved1, p); 533 scr_writew(saved2, p + 1); 534 535 if (vga_video_type == VIDEO_TYPE_EGAC 536 || vga_video_type == VIDEO_TYPE_VGAC 537 || vga_video_type == VIDEO_TYPE_EGAM) { 538 vga_hardscroll_enabled = vga_hardscroll_user_enable; 539 vga_default_font_height = screen_info.orig_video_points; 540 vga_video_font_height = screen_info.orig_video_points; 541 /* This may be suboptimal but is a safe bet - go with it */ 542 vga_scan_lines = 543 vga_video_font_height * vga_video_num_lines; 544 } 545 546 vgacon_xres = screen_info.orig_video_cols * VGA_FONTWIDTH; 547 vgacon_yres = vga_scan_lines; 548 549 if (!vga_init_done) { 550 vgacon_scrollback_startup(); 551 vga_init_done = 1; 552 } 553 554 return display_desc; 555 } 556 557 static void vgacon_init(struct vc_data *c, int init) 558 { 559 unsigned long p; 560 561 /* 562 * We cannot be loaded as a module, therefore init is always 1, 563 * but vgacon_init can be called more than once, and init will 564 * not be 1. 565 */ 566 c->vc_can_do_color = vga_can_do_color; 567 568 /* set dimensions manually if init != 0 since vc_resize() will fail */ 569 if (init) { 570 c->vc_cols = vga_video_num_columns; 571 c->vc_rows = vga_video_num_lines; 572 } else 573 vc_resize(c, vga_video_num_columns, vga_video_num_lines); 574 575 c->vc_scan_lines = vga_scan_lines; 576 c->vc_font.height = vga_video_font_height; 577 c->vc_complement_mask = 0x7700; 578 if (vga_512_chars) 579 c->vc_hi_font_mask = 0x0800; 580 p = *c->vc_uni_pagedir_loc; 581 if (c->vc_uni_pagedir_loc == &c->vc_uni_pagedir || 582 !--c->vc_uni_pagedir_loc[1]) 583 con_free_unimap(c); 584 c->vc_uni_pagedir_loc = vgacon_uni_pagedir; 585 vgacon_uni_pagedir[1]++; 586 if (!vgacon_uni_pagedir[0] && p) 587 con_set_default_unimap(c); 588 589 /* Only set the default if the user didn't deliberately override it */ 590 if (global_cursor_default == -1) 591 global_cursor_default = 592 !(screen_info.flags & VIDEO_FLAGS_NOCURSOR); 593 } 594 595 static void vgacon_deinit(struct vc_data *c) 596 { 597 /* When closing the active console, reset video origin */ 598 if (CON_IS_VISIBLE(c)) { 599 c->vc_visible_origin = vga_vram_base; 600 vga_set_mem_top(c); 601 } 602 603 if (!--vgacon_uni_pagedir[1]) 604 con_free_unimap(c); 605 c->vc_uni_pagedir_loc = &c->vc_uni_pagedir; 606 con_set_default_unimap(c); 607 } 608 609 static u8 vgacon_build_attr(struct vc_data *c, u8 color, u8 intensity, 610 u8 blink, u8 underline, u8 reverse, u8 italic) 611 { 612 u8 attr = color; 613 614 if (vga_can_do_color) { 615 if (italic) 616 attr = (attr & 0xF0) | c->vc_itcolor; 617 else if (underline) 618 attr = (attr & 0xf0) | c->vc_ulcolor; 619 else if (intensity == 0) 620 attr = (attr & 0xf0) | c->vc_halfcolor; 621 } 622 if (reverse) 623 attr = 624 ((attr) & 0x88) | ((((attr) >> 4) | ((attr) << 4)) & 625 0x77); 626 if (blink) 627 attr ^= 0x80; 628 if (intensity == 2) 629 attr ^= 0x08; 630 if (!vga_can_do_color) { 631 if (italic) 632 attr = (attr & 0xF8) | 0x02; 633 else if (underline) 634 attr = (attr & 0xf8) | 0x01; 635 else if (intensity == 0) 636 attr = (attr & 0xf0) | 0x08; 637 } 638 return attr; 639 } 640 641 static void vgacon_invert_region(struct vc_data *c, u16 * p, int count) 642 { 643 int col = vga_can_do_color; 644 645 while (count--) { 646 u16 a = scr_readw(p); 647 if (col) 648 a = ((a) & 0x88ff) | (((a) & 0x7000) >> 4) | 649 (((a) & 0x0700) << 4); 650 else 651 a ^= ((a & 0x0700) == 0x0100) ? 0x7000 : 0x7700; 652 scr_writew(a, p++); 653 } 654 } 655 656 static void vgacon_set_cursor_size(int xpos, int from, int to) 657 { 658 unsigned long flags; 659 int curs, cure; 660 661 #ifdef TRIDENT_GLITCH 662 if (xpos < 16) 663 from--, to--; 664 #endif 665 666 if ((from == cursor_size_lastfrom) && (to == cursor_size_lastto)) 667 return; 668 cursor_size_lastfrom = from; 669 cursor_size_lastto = to; 670 671 spin_lock_irqsave(&vga_lock, flags); 672 if (vga_video_type >= VIDEO_TYPE_VGAC) { 673 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg); 674 curs = inb_p(vga_video_port_val); 675 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg); 676 cure = inb_p(vga_video_port_val); 677 } else { 678 curs = 0; 679 cure = 0; 680 } 681 682 curs = (curs & 0xc0) | from; 683 cure = (cure & 0xe0) | to; 684 685 outb_p(VGA_CRTC_CURSOR_START, vga_video_port_reg); 686 outb_p(curs, vga_video_port_val); 687 outb_p(VGA_CRTC_CURSOR_END, vga_video_port_reg); 688 outb_p(cure, vga_video_port_val); 689 spin_unlock_irqrestore(&vga_lock, flags); 690 } 691 692 static void vgacon_cursor(struct vc_data *c, int mode) 693 { 694 if (c->vc_mode != KD_TEXT) 695 return; 696 697 vgacon_restore_screen(c); 698 699 switch (mode) { 700 case CM_ERASE: 701 write_vga(14, (c->vc_pos - vga_vram_base) / 2); 702 if (vga_video_type >= VIDEO_TYPE_VGAC) 703 vgacon_set_cursor_size(c->vc_x, 31, 30); 704 else 705 vgacon_set_cursor_size(c->vc_x, 31, 31); 706 break; 707 708 case CM_MOVE: 709 case CM_DRAW: 710 write_vga(14, (c->vc_pos - vga_vram_base) / 2); 711 switch (c->vc_cursor_type & 0x0f) { 712 case CUR_UNDERLINE: 713 vgacon_set_cursor_size(c->vc_x, 714 c->vc_font.height - 715 (c->vc_font.height < 716 10 ? 2 : 3), 717 c->vc_font.height - 718 (c->vc_font.height < 719 10 ? 1 : 2)); 720 break; 721 case CUR_TWO_THIRDS: 722 vgacon_set_cursor_size(c->vc_x, 723 c->vc_font.height / 3, 724 c->vc_font.height - 725 (c->vc_font.height < 726 10 ? 1 : 2)); 727 break; 728 case CUR_LOWER_THIRD: 729 vgacon_set_cursor_size(c->vc_x, 730 (c->vc_font.height * 2) / 3, 731 c->vc_font.height - 732 (c->vc_font.height < 733 10 ? 1 : 2)); 734 break; 735 case CUR_LOWER_HALF: 736 vgacon_set_cursor_size(c->vc_x, 737 c->vc_font.height / 2, 738 c->vc_font.height - 739 (c->vc_font.height < 740 10 ? 1 : 2)); 741 break; 742 case CUR_NONE: 743 if (vga_video_type >= VIDEO_TYPE_VGAC) 744 vgacon_set_cursor_size(c->vc_x, 31, 30); 745 else 746 vgacon_set_cursor_size(c->vc_x, 31, 31); 747 break; 748 default: 749 vgacon_set_cursor_size(c->vc_x, 1, 750 c->vc_font.height); 751 break; 752 } 753 break; 754 } 755 } 756 757 static int vgacon_doresize(struct vc_data *c, 758 unsigned int width, unsigned int height) 759 { 760 unsigned long flags; 761 unsigned int scanlines = height * c->vc_font.height; 762 u8 scanlines_lo = 0, r7 = 0, vsync_end = 0, mode, max_scan; 763 764 spin_lock_irqsave(&vga_lock, flags); 765 766 vgacon_xres = width * VGA_FONTWIDTH; 767 vgacon_yres = height * c->vc_font.height; 768 if (vga_video_type >= VIDEO_TYPE_VGAC) { 769 outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg); 770 max_scan = inb_p(vga_video_port_val); 771 772 if (max_scan & 0x80) 773 scanlines <<= 1; 774 775 outb_p(VGA_CRTC_MODE, vga_video_port_reg); 776 mode = inb_p(vga_video_port_val); 777 778 if (mode & 0x04) 779 scanlines >>= 1; 780 781 scanlines -= 1; 782 scanlines_lo = scanlines & 0xff; 783 784 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg); 785 r7 = inb_p(vga_video_port_val) & ~0x42; 786 787 if (scanlines & 0x100) 788 r7 |= 0x02; 789 if (scanlines & 0x200) 790 r7 |= 0x40; 791 792 /* deprotect registers */ 793 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg); 794 vsync_end = inb_p(vga_video_port_val); 795 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg); 796 outb_p(vsync_end & ~0x80, vga_video_port_val); 797 } 798 799 outb_p(VGA_CRTC_H_DISP, vga_video_port_reg); 800 outb_p(width - 1, vga_video_port_val); 801 outb_p(VGA_CRTC_OFFSET, vga_video_port_reg); 802 outb_p(width >> 1, vga_video_port_val); 803 804 if (vga_video_type >= VIDEO_TYPE_VGAC) { 805 outb_p(VGA_CRTC_V_DISP_END, vga_video_port_reg); 806 outb_p(scanlines_lo, vga_video_port_val); 807 outb_p(VGA_CRTC_OVERFLOW, vga_video_port_reg); 808 outb_p(r7,vga_video_port_val); 809 810 /* reprotect registers */ 811 outb_p(VGA_CRTC_V_SYNC_END, vga_video_port_reg); 812 outb_p(vsync_end, vga_video_port_val); 813 } 814 815 spin_unlock_irqrestore(&vga_lock, flags); 816 return 0; 817 } 818 819 static int vgacon_switch(struct vc_data *c) 820 { 821 int x = c->vc_cols * VGA_FONTWIDTH; 822 int y = c->vc_rows * c->vc_font.height; 823 int rows = screen_info.orig_video_lines * vga_default_font_height/ 824 c->vc_font.height; 825 /* 826 * We need to save screen size here as it's the only way 827 * we can spot the screen has been resized and we need to 828 * set size of freshly allocated screens ourselves. 829 */ 830 vga_video_num_columns = c->vc_cols; 831 vga_video_num_lines = c->vc_rows; 832 833 /* We can only copy out the size of the video buffer here, 834 * otherwise we get into VGA BIOS */ 835 836 if (!vga_is_gfx) { 837 scr_memcpyw((u16 *) c->vc_origin, (u16 *) c->vc_screenbuf, 838 c->vc_screenbuf_size > vga_vram_size ? 839 vga_vram_size : c->vc_screenbuf_size); 840 841 if ((vgacon_xres != x || vgacon_yres != y) && 842 (!(vga_video_num_columns % 2) && 843 vga_video_num_columns <= screen_info.orig_video_cols && 844 vga_video_num_lines <= rows)) 845 vgacon_doresize(c, c->vc_cols, c->vc_rows); 846 } 847 848 vgacon_scrollback_init(c->vc_size_row); 849 return 0; /* Redrawing not needed */ 850 } 851 852 static void vga_set_palette(struct vc_data *vc, unsigned char *table) 853 { 854 int i, j; 855 856 vga_w(state.vgabase, VGA_PEL_MSK, 0xff); 857 for (i = j = 0; i < 16; i++) { 858 vga_w(state.vgabase, VGA_PEL_IW, table[i]); 859 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); 860 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); 861 vga_w(state.vgabase, VGA_PEL_D, vc->vc_palette[j++] >> 2); 862 } 863 } 864 865 static int vgacon_set_palette(struct vc_data *vc, unsigned char *table) 866 { 867 #ifdef CAN_LOAD_PALETTE 868 if (vga_video_type != VIDEO_TYPE_VGAC || vga_palette_blanked 869 || !CON_IS_VISIBLE(vc)) 870 return -EINVAL; 871 vga_set_palette(vc, table); 872 return 0; 873 #else 874 return -EINVAL; 875 #endif 876 } 877 878 /* structure holding original VGA register settings */ 879 static struct { 880 unsigned char SeqCtrlIndex; /* Sequencer Index reg. */ 881 unsigned char CrtCtrlIndex; /* CRT-Contr. Index reg. */ 882 unsigned char CrtMiscIO; /* Miscellaneous register */ 883 unsigned char HorizontalTotal; /* CRT-Controller:00h */ 884 unsigned char HorizDisplayEnd; /* CRT-Controller:01h */ 885 unsigned char StartHorizRetrace; /* CRT-Controller:04h */ 886 unsigned char EndHorizRetrace; /* CRT-Controller:05h */ 887 unsigned char Overflow; /* CRT-Controller:07h */ 888 unsigned char StartVertRetrace; /* CRT-Controller:10h */ 889 unsigned char EndVertRetrace; /* CRT-Controller:11h */ 890 unsigned char ModeControl; /* CRT-Controller:17h */ 891 unsigned char ClockingMode; /* Seq-Controller:01h */ 892 } vga_state; 893 894 static void vga_vesa_blank(struct vgastate *state, int mode) 895 { 896 /* save original values of VGA controller registers */ 897 if (!vga_vesa_blanked) { 898 spin_lock_irq(&vga_lock); 899 vga_state.SeqCtrlIndex = vga_r(state->vgabase, VGA_SEQ_I); 900 vga_state.CrtCtrlIndex = inb_p(vga_video_port_reg); 901 vga_state.CrtMiscIO = vga_r(state->vgabase, VGA_MIS_R); 902 spin_unlock_irq(&vga_lock); 903 904 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ 905 vga_state.HorizontalTotal = inb_p(vga_video_port_val); 906 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ 907 vga_state.HorizDisplayEnd = inb_p(vga_video_port_val); 908 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ 909 vga_state.StartHorizRetrace = inb_p(vga_video_port_val); 910 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ 911 vga_state.EndHorizRetrace = inb_p(vga_video_port_val); 912 outb_p(0x07, vga_video_port_reg); /* Overflow */ 913 vga_state.Overflow = inb_p(vga_video_port_val); 914 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ 915 vga_state.StartVertRetrace = inb_p(vga_video_port_val); 916 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ 917 vga_state.EndVertRetrace = inb_p(vga_video_port_val); 918 outb_p(0x17, vga_video_port_reg); /* ModeControl */ 919 vga_state.ModeControl = inb_p(vga_video_port_val); 920 vga_state.ClockingMode = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); 921 } 922 923 /* assure that video is enabled */ 924 /* "0x20" is VIDEO_ENABLE_bit in register 01 of sequencer */ 925 spin_lock_irq(&vga_lock); 926 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode | 0x20); 927 928 /* test for vertical retrace in process.... */ 929 if ((vga_state.CrtMiscIO & 0x80) == 0x80) 930 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO & 0xEF); 931 932 /* 933 * Set <End of vertical retrace> to minimum (0) and 934 * <Start of vertical Retrace> to maximum (incl. overflow) 935 * Result: turn off vertical sync (VSync) pulse. 936 */ 937 if (mode & VESA_VSYNC_SUSPEND) { 938 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ 939 outb_p(0xff, vga_video_port_val); /* maximum value */ 940 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ 941 outb_p(0x40, vga_video_port_val); /* minimum (bits 0..3) */ 942 outb_p(0x07, vga_video_port_reg); /* Overflow */ 943 outb_p(vga_state.Overflow | 0x84, vga_video_port_val); /* bits 9,10 of vert. retrace */ 944 } 945 946 if (mode & VESA_HSYNC_SUSPEND) { 947 /* 948 * Set <End of horizontal retrace> to minimum (0) and 949 * <Start of horizontal Retrace> to maximum 950 * Result: turn off horizontal sync (HSync) pulse. 951 */ 952 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ 953 outb_p(0xff, vga_video_port_val); /* maximum */ 954 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ 955 outb_p(0x00, vga_video_port_val); /* minimum (0) */ 956 } 957 958 /* restore both index registers */ 959 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); 960 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); 961 spin_unlock_irq(&vga_lock); 962 } 963 964 static void vga_vesa_unblank(struct vgastate *state) 965 { 966 /* restore original values of VGA controller registers */ 967 spin_lock_irq(&vga_lock); 968 vga_w(state->vgabase, VGA_MIS_W, vga_state.CrtMiscIO); 969 970 outb_p(0x00, vga_video_port_reg); /* HorizontalTotal */ 971 outb_p(vga_state.HorizontalTotal, vga_video_port_val); 972 outb_p(0x01, vga_video_port_reg); /* HorizDisplayEnd */ 973 outb_p(vga_state.HorizDisplayEnd, vga_video_port_val); 974 outb_p(0x04, vga_video_port_reg); /* StartHorizRetrace */ 975 outb_p(vga_state.StartHorizRetrace, vga_video_port_val); 976 outb_p(0x05, vga_video_port_reg); /* EndHorizRetrace */ 977 outb_p(vga_state.EndHorizRetrace, vga_video_port_val); 978 outb_p(0x07, vga_video_port_reg); /* Overflow */ 979 outb_p(vga_state.Overflow, vga_video_port_val); 980 outb_p(0x10, vga_video_port_reg); /* StartVertRetrace */ 981 outb_p(vga_state.StartVertRetrace, vga_video_port_val); 982 outb_p(0x11, vga_video_port_reg); /* EndVertRetrace */ 983 outb_p(vga_state.EndVertRetrace, vga_video_port_val); 984 outb_p(0x17, vga_video_port_reg); /* ModeControl */ 985 outb_p(vga_state.ModeControl, vga_video_port_val); 986 /* ClockingMode */ 987 vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, vga_state.ClockingMode); 988 989 /* restore index/control registers */ 990 vga_w(state->vgabase, VGA_SEQ_I, vga_state.SeqCtrlIndex); 991 outb_p(vga_state.CrtCtrlIndex, vga_video_port_reg); 992 spin_unlock_irq(&vga_lock); 993 } 994 995 static void vga_pal_blank(struct vgastate *state) 996 { 997 int i; 998 999 vga_w(state->vgabase, VGA_PEL_MSK, 0xff); 1000 for (i = 0; i < 16; i++) { 1001 vga_w(state->vgabase, VGA_PEL_IW, i); 1002 vga_w(state->vgabase, VGA_PEL_D, 0); 1003 vga_w(state->vgabase, VGA_PEL_D, 0); 1004 vga_w(state->vgabase, VGA_PEL_D, 0); 1005 } 1006 } 1007 1008 static int vgacon_blank(struct vc_data *c, int blank, int mode_switch) 1009 { 1010 switch (blank) { 1011 case 0: /* Unblank */ 1012 if (vga_vesa_blanked) { 1013 vga_vesa_unblank(&state); 1014 vga_vesa_blanked = 0; 1015 } 1016 if (vga_palette_blanked) { 1017 vga_set_palette(c, color_table); 1018 vga_palette_blanked = 0; 1019 return 0; 1020 } 1021 vga_is_gfx = 0; 1022 /* Tell console.c that it has to restore the screen itself */ 1023 return 1; 1024 case 1: /* Normal blanking */ 1025 case -1: /* Obsolete */ 1026 if (!mode_switch && vga_video_type == VIDEO_TYPE_VGAC) { 1027 vga_pal_blank(&state); 1028 vga_palette_blanked = 1; 1029 return 0; 1030 } 1031 vgacon_set_origin(c); 1032 scr_memsetw((void *) vga_vram_base, BLANK, 1033 c->vc_screenbuf_size); 1034 if (mode_switch) 1035 vga_is_gfx = 1; 1036 return 1; 1037 default: /* VESA blanking */ 1038 if (vga_video_type == VIDEO_TYPE_VGAC) { 1039 vga_vesa_blank(&state, blank - 1); 1040 vga_vesa_blanked = blank; 1041 } 1042 return 0; 1043 } 1044 } 1045 1046 /* 1047 * PIO_FONT support. 1048 * 1049 * The font loading code goes back to the codepage package by 1050 * Joel Hoffman (joel@wam.umd.edu). (He reports that the original 1051 * reference is: "From: p. 307 of _Programmer's Guide to PC & PS/2 1052 * Video Systems_ by Richard Wilton. 1987. Microsoft Press".) 1053 * 1054 * Change for certain monochrome monitors by Yury Shevchuck 1055 * (sizif@botik.yaroslavl.su). 1056 */ 1057 1058 #ifdef CAN_LOAD_EGA_FONTS 1059 1060 #define colourmap 0xa0000 1061 /* Pauline Middelink <middelin@polyware.iaf.nl> reports that we 1062 should use 0xA0000 for the bwmap as well.. */ 1063 #define blackwmap 0xa0000 1064 #define cmapsz 8192 1065 1066 static int vgacon_do_font_op(struct vgastate *state,char *arg,int set,int ch512) 1067 { 1068 unsigned short video_port_status = vga_video_port_reg + 6; 1069 int font_select = 0x00, beg, i; 1070 char *charmap; 1071 1072 if (vga_video_type != VIDEO_TYPE_EGAM) { 1073 charmap = (char *) VGA_MAP_MEM(colourmap, 0); 1074 beg = 0x0e; 1075 #ifdef VGA_CAN_DO_64KB 1076 if (vga_video_type == VIDEO_TYPE_VGAC) 1077 beg = 0x06; 1078 #endif 1079 } else { 1080 charmap = (char *) VGA_MAP_MEM(blackwmap, 0); 1081 beg = 0x0a; 1082 } 1083 1084 #ifdef BROKEN_GRAPHICS_PROGRAMS 1085 /* 1086 * All fonts are loaded in slot 0 (0:1 for 512 ch) 1087 */ 1088 1089 if (!arg) 1090 return -EINVAL; /* Return to default font not supported */ 1091 1092 vga_font_is_default = 0; 1093 font_select = ch512 ? 0x04 : 0x00; 1094 #else 1095 /* 1096 * The default font is kept in slot 0 and is never touched. 1097 * A custom font is loaded in slot 2 (256 ch) or 2:3 (512 ch) 1098 */ 1099 1100 if (set) { 1101 vga_font_is_default = !arg; 1102 if (!arg) 1103 ch512 = 0; /* Default font is always 256 */ 1104 font_select = arg ? (ch512 ? 0x0e : 0x0a) : 0x00; 1105 } 1106 1107 if (!vga_font_is_default) 1108 charmap += 4 * cmapsz; 1109 #endif 1110 1111 unlock_kernel(); 1112 spin_lock_irq(&vga_lock); 1113 /* First, the Sequencer */ 1114 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); 1115 /* CPU writes only to map 2 */ 1116 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x04); 1117 /* Sequential addressing */ 1118 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x07); 1119 /* Clear synchronous reset */ 1120 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); 1121 1122 /* Now, the graphics controller, select map 2 */ 1123 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x02); 1124 /* disable odd-even addressing */ 1125 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x00); 1126 /* map start at A000:0000 */ 1127 vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x00); 1128 spin_unlock_irq(&vga_lock); 1129 1130 if (arg) { 1131 if (set) 1132 for (i = 0; i < cmapsz; i++) 1133 vga_writeb(arg[i], charmap + i); 1134 else 1135 for (i = 0; i < cmapsz; i++) 1136 arg[i] = vga_readb(charmap + i); 1137 1138 /* 1139 * In 512-character mode, the character map is not contiguous if 1140 * we want to remain EGA compatible -- which we do 1141 */ 1142 1143 if (ch512) { 1144 charmap += 2 * cmapsz; 1145 arg += cmapsz; 1146 if (set) 1147 for (i = 0; i < cmapsz; i++) 1148 vga_writeb(arg[i], charmap + i); 1149 else 1150 for (i = 0; i < cmapsz; i++) 1151 arg[i] = vga_readb(charmap + i); 1152 } 1153 } 1154 1155 spin_lock_irq(&vga_lock); 1156 /* First, the sequencer, Synchronous reset */ 1157 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01); 1158 /* CPU writes to maps 0 and 1 */ 1159 vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x03); 1160 /* odd-even addressing */ 1161 vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x03); 1162 /* Character Map Select */ 1163 if (set) 1164 vga_wseq(state->vgabase, VGA_SEQ_CHARACTER_MAP, font_select); 1165 /* clear synchronous reset */ 1166 vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); 1167 1168 /* Now, the graphics controller, select map 0 for CPU */ 1169 vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x00); 1170 /* enable even-odd addressing */ 1171 vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x10); 1172 /* map starts at b800:0 or b000:0 */ 1173 vga_wgfx(state->vgabase, VGA_GFX_MISC, beg); 1174 1175 /* if 512 char mode is already enabled don't re-enable it. */ 1176 if ((set) && (ch512 != vga_512_chars)) { 1177 /* attribute controller */ 1178 for (i = 0; i < MAX_NR_CONSOLES; i++) { 1179 struct vc_data *c = vc_cons[i].d; 1180 if (c && c->vc_sw == &vga_con) 1181 c->vc_hi_font_mask = ch512 ? 0x0800 : 0; 1182 } 1183 vga_512_chars = ch512; 1184 /* 256-char: enable intensity bit 1185 512-char: disable intensity bit */ 1186 inb_p(video_port_status); /* clear address flip-flop */ 1187 /* color plane enable register */ 1188 vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f); 1189 /* Wilton (1987) mentions the following; I don't know what 1190 it means, but it works, and it appears necessary */ 1191 inb_p(video_port_status); 1192 vga_wattr(state->vgabase, VGA_AR_ENABLE_DISPLAY, 0); 1193 } 1194 spin_unlock_irq(&vga_lock); 1195 lock_kernel(); 1196 return 0; 1197 } 1198 1199 /* 1200 * Adjust the screen to fit a font of a certain height 1201 */ 1202 static int vgacon_adjust_height(struct vc_data *vc, unsigned fontheight) 1203 { 1204 unsigned char ovr, vde, fsr; 1205 int rows, maxscan, i; 1206 1207 rows = vc->vc_scan_lines / fontheight; /* Number of video rows we end up with */ 1208 maxscan = rows * fontheight - 1; /* Scan lines to actually display-1 */ 1209 1210 /* Reprogram the CRTC for the new font size 1211 Note: the attempt to read the overflow register will fail 1212 on an EGA, but using 0xff for the previous value appears to 1213 be OK for EGA text modes in the range 257-512 scan lines, so I 1214 guess we don't need to worry about it. 1215 1216 The same applies for the spill bits in the font size and cursor 1217 registers; they are write-only on EGA, but it appears that they 1218 are all don't care bits on EGA, so I guess it doesn't matter. */ 1219 1220 spin_lock_irq(&vga_lock); 1221 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ 1222 ovr = inb_p(vga_video_port_val); 1223 outb_p(0x09, vga_video_port_reg); /* Font size register */ 1224 fsr = inb_p(vga_video_port_val); 1225 spin_unlock_irq(&vga_lock); 1226 1227 vde = maxscan & 0xff; /* Vertical display end reg */ 1228 ovr = (ovr & 0xbd) + /* Overflow register */ 1229 ((maxscan & 0x100) >> 7) + ((maxscan & 0x200) >> 3); 1230 fsr = (fsr & 0xe0) + (fontheight - 1); /* Font size register */ 1231 1232 spin_lock_irq(&vga_lock); 1233 outb_p(0x07, vga_video_port_reg); /* CRTC overflow register */ 1234 outb_p(ovr, vga_video_port_val); 1235 outb_p(0x09, vga_video_port_reg); /* Font size */ 1236 outb_p(fsr, vga_video_port_val); 1237 outb_p(0x12, vga_video_port_reg); /* Vertical display limit */ 1238 outb_p(vde, vga_video_port_val); 1239 spin_unlock_irq(&vga_lock); 1240 vga_video_font_height = fontheight; 1241 1242 for (i = 0; i < MAX_NR_CONSOLES; i++) { 1243 struct vc_data *c = vc_cons[i].d; 1244 1245 if (c && c->vc_sw == &vga_con) { 1246 if (CON_IS_VISIBLE(c)) { 1247 /* void size to cause regs to be rewritten */ 1248 cursor_size_lastfrom = 0; 1249 cursor_size_lastto = 0; 1250 c->vc_sw->con_cursor(c, CM_DRAW); 1251 } 1252 c->vc_font.height = fontheight; 1253 vc_resize(c, 0, rows); /* Adjust console size */ 1254 } 1255 } 1256 return 0; 1257 } 1258 1259 static int vgacon_font_set(struct vc_data *c, struct console_font *font, unsigned flags) 1260 { 1261 unsigned charcount = font->charcount; 1262 int rc; 1263 1264 if (vga_video_type < VIDEO_TYPE_EGAM) 1265 return -EINVAL; 1266 1267 if (font->width != VGA_FONTWIDTH || 1268 (charcount != 256 && charcount != 512)) 1269 return -EINVAL; 1270 1271 rc = vgacon_do_font_op(&state, font->data, 1, charcount == 512); 1272 if (rc) 1273 return rc; 1274 1275 if (!(flags & KD_FONT_FLAG_DONT_RECALC)) 1276 rc = vgacon_adjust_height(c, font->height); 1277 return rc; 1278 } 1279 1280 static int vgacon_font_get(struct vc_data *c, struct console_font *font) 1281 { 1282 if (vga_video_type < VIDEO_TYPE_EGAM) 1283 return -EINVAL; 1284 1285 font->width = VGA_FONTWIDTH; 1286 font->height = c->vc_font.height; 1287 font->charcount = vga_512_chars ? 512 : 256; 1288 if (!font->data) 1289 return 0; 1290 return vgacon_do_font_op(&state, font->data, 0, vga_512_chars); 1291 } 1292 1293 #else 1294 1295 #define vgacon_font_set NULL 1296 #define vgacon_font_get NULL 1297 1298 #endif 1299 1300 static int vgacon_resize(struct vc_data *c, unsigned int width, 1301 unsigned int height, unsigned int user) 1302 { 1303 if (width % 2 || width > screen_info.orig_video_cols || 1304 height > (screen_info.orig_video_lines * vga_default_font_height)/ 1305 c->vc_font.height) 1306 /* let svgatextmode tinker with video timings and 1307 return success */ 1308 return (user) ? 0 : -EINVAL; 1309 1310 if (CON_IS_VISIBLE(c) && !vga_is_gfx) /* who knows */ 1311 vgacon_doresize(c, width, height); 1312 return 0; 1313 } 1314 1315 static int vgacon_set_origin(struct vc_data *c) 1316 { 1317 if (vga_is_gfx || /* We don't play origin tricks in graphic modes */ 1318 (console_blanked && !vga_palette_blanked)) /* Nor we write to blanked screens */ 1319 return 0; 1320 c->vc_origin = c->vc_visible_origin = vga_vram_base; 1321 vga_set_mem_top(c); 1322 vga_rolled_over = 0; 1323 return 1; 1324 } 1325 1326 static void vgacon_save_screen(struct vc_data *c) 1327 { 1328 static int vga_bootup_console = 0; 1329 1330 if (!vga_bootup_console) { 1331 /* This is a gross hack, but here is the only place we can 1332 * set bootup console parameters without messing up generic 1333 * console initialization routines. 1334 */ 1335 vga_bootup_console = 1; 1336 c->vc_x = screen_info.orig_x; 1337 c->vc_y = screen_info.orig_y; 1338 } 1339 1340 /* We can't copy in more than the size of the video buffer, 1341 * or we'll be copying in VGA BIOS */ 1342 1343 if (!vga_is_gfx) 1344 scr_memcpyw((u16 *) c->vc_screenbuf, (u16 *) c->vc_origin, 1345 c->vc_screenbuf_size > vga_vram_size ? vga_vram_size : c->vc_screenbuf_size); 1346 } 1347 1348 static int vgacon_scroll(struct vc_data *c, int t, int b, int dir, 1349 int lines) 1350 { 1351 unsigned long oldo; 1352 unsigned int delta; 1353 1354 if (t || b != c->vc_rows || vga_is_gfx || c->vc_mode != KD_TEXT) 1355 return 0; 1356 1357 if (!vga_hardscroll_enabled || lines >= c->vc_rows / 2) 1358 return 0; 1359 1360 vgacon_restore_screen(c); 1361 oldo = c->vc_origin; 1362 delta = lines * c->vc_size_row; 1363 if (dir == SM_UP) { 1364 vgacon_scrollback_update(c, t, lines); 1365 if (c->vc_scr_end + delta >= vga_vram_end) { 1366 scr_memcpyw((u16 *) vga_vram_base, 1367 (u16 *) (oldo + delta), 1368 c->vc_screenbuf_size - delta); 1369 c->vc_origin = vga_vram_base; 1370 vga_rolled_over = oldo - vga_vram_base; 1371 } else 1372 c->vc_origin += delta; 1373 scr_memsetw((u16 *) (c->vc_origin + c->vc_screenbuf_size - 1374 delta), c->vc_video_erase_char, 1375 delta); 1376 } else { 1377 if (oldo - delta < vga_vram_base) { 1378 scr_memmovew((u16 *) (vga_vram_end - 1379 c->vc_screenbuf_size + 1380 delta), (u16 *) oldo, 1381 c->vc_screenbuf_size - delta); 1382 c->vc_origin = vga_vram_end - c->vc_screenbuf_size; 1383 vga_rolled_over = 0; 1384 } else 1385 c->vc_origin -= delta; 1386 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; 1387 scr_memsetw((u16 *) (c->vc_origin), c->vc_video_erase_char, 1388 delta); 1389 } 1390 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size; 1391 c->vc_visible_origin = c->vc_origin; 1392 vga_set_mem_top(c); 1393 c->vc_pos = (c->vc_pos - oldo) + c->vc_origin; 1394 return 1; 1395 } 1396 1397 1398 /* 1399 * The console `switch' structure for the VGA based console 1400 */ 1401 1402 static int vgacon_dummy(struct vc_data *c) 1403 { 1404 return 0; 1405 } 1406 1407 #define DUMMY (void *) vgacon_dummy 1408 1409 const struct consw vga_con = { 1410 .owner = THIS_MODULE, 1411 .con_startup = vgacon_startup, 1412 .con_init = vgacon_init, 1413 .con_deinit = vgacon_deinit, 1414 .con_clear = DUMMY, 1415 .con_putc = DUMMY, 1416 .con_putcs = DUMMY, 1417 .con_cursor = vgacon_cursor, 1418 .con_scroll = vgacon_scroll, 1419 .con_bmove = DUMMY, 1420 .con_switch = vgacon_switch, 1421 .con_blank = vgacon_blank, 1422 .con_font_set = vgacon_font_set, 1423 .con_font_get = vgacon_font_get, 1424 .con_resize = vgacon_resize, 1425 .con_set_palette = vgacon_set_palette, 1426 .con_scrolldelta = vgacon_scrolldelta, 1427 .con_set_origin = vgacon_set_origin, 1428 .con_save_screen = vgacon_save_screen, 1429 .con_build_attr = vgacon_build_attr, 1430 .con_invert_region = vgacon_invert_region, 1431 }; 1432 1433 MODULE_LICENSE("GPL"); 1434