1 /*- 2 * Copyright (c) 1991-1997 Søren Schmidt 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <signal.h> 33 #include <sys/fbio.h> 34 #include "vgl.h" 35 36 static byte VGLSavePaletteRed[256]; 37 static byte VGLSavePaletteGreen[256]; 38 static byte VGLSavePaletteBlue[256]; 39 40 #define ABS(a) (((a)<0) ? -(a) : (a)) 41 #define SGN(a) (((a)<0) ? -1 : 1) 42 #define min(x, y) (((x) < (y)) ? (x) : (y)) 43 #define max(x, y) (((x) > (y)) ? (x) : (y)) 44 45 static void 46 color2mem(u_long color, byte *b, int len) 47 { 48 switch (len) { 49 case 4: 50 b[3] = (color >> 24) & 0xff; 51 /* fallthrough */ 52 case 3: 53 b[2] = (color >> 16) & 0xff; 54 /* fallthrough */ 55 case 2: 56 b[1] = (color >> 8) & 0xff; 57 /* fallthrough */ 58 case 1: 59 default: 60 b[0] = color & 0xff; 61 break; 62 } 63 64 return; 65 } 66 67 static u_long 68 mem2color(byte *b, int len) 69 { 70 u_long color = 0; 71 72 switch (len) { 73 case 4: 74 color |= (b[3] & 0xff) << 24; 75 /* fallthrough */ 76 case 3: 77 color |= (b[2] & 0xff) << 16; 78 /* fallthrough */ 79 case 2: 80 color |= (b[1] & 0xff) << 8; 81 /* fallthrough */ 82 case 1: 83 default: 84 color |= (b[0] & 0xff); 85 break; 86 } 87 88 return color; 89 } 90 91 void 92 VGLSetXY(VGLBitmap *object, int x, int y, u_long color) 93 { 94 int offset; 95 byte b[4]; 96 97 VGLCheckSwitch(); 98 if (x>=0 && x<object->VXsize && y>=0 && y<object->VYsize) { 99 if (!VGLMouseFreeze(x, y, 1, 1, color)) { 100 switch (object->Type) { 101 case MEMBUF: 102 case VIDBUF8: 103 object->Bitmap[y*object->VXsize+x]=((byte)color); 104 break; 105 case VIDBUF8S: 106 object->Bitmap[VGLSetSegment(y*object->VXsize+x)]=((byte)color); 107 break; 108 case VIDBUF16: 109 case VIDBUF24: 110 case VIDBUF32: 111 color2mem(color, b, object->PixelBytes); 112 bcopy(b, &object->Bitmap[(y*object->VXsize+x) * object->PixelBytes], 113 object->PixelBytes); 114 break; 115 case VIDBUF16S: 116 case VIDBUF24S: 117 case VIDBUF32S: 118 color2mem(color, b, object->PixelBytes); 119 offset = VGLSetSegment((y*object->VXsize+x) * object->PixelBytes); 120 bcopy(b, &object->Bitmap[offset], object->PixelBytes); 121 break; 122 case VIDBUF8X: 123 outb(0x3c4, 0x02); 124 outb(0x3c5, 0x01 << (x&0x3)); 125 object->Bitmap[(unsigned)(VGLAdpInfo.va_line_width*y)+(x/4)] = ((byte)color); 126 break; 127 case VIDBUF4S: 128 offset = VGLSetSegment(y*VGLAdpInfo.va_line_width + x/8); 129 goto set_planar; 130 case VIDBUF4: 131 offset = y*VGLAdpInfo.va_line_width + x/8; 132 set_planar: 133 outb(0x3c4, 0x02); outb(0x3c5, 0x0f); 134 outb(0x3ce, 0x00); outb(0x3cf, (byte)color & 0x0f); /* set/reset */ 135 outb(0x3ce, 0x01); outb(0x3cf, 0x0f); /* set/reset enable */ 136 outb(0x3ce, 0x08); outb(0x3cf, 0x80 >> (x%8)); /* bit mask */ 137 object->Bitmap[offset] |= (byte)color; 138 } 139 } 140 VGLMouseUnFreeze(); 141 } 142 } 143 144 u_long 145 VGLGetXY(VGLBitmap *object, int x, int y) 146 { 147 int offset; 148 byte b[4]; 149 #if 0 150 int i; 151 u_long color; 152 byte mask; 153 #endif 154 155 VGLCheckSwitch(); 156 if (x<0 || x>=object->VXsize || y<0 || y>=object->VYsize) 157 return 0; 158 switch (object->Type) { 159 case MEMBUF: 160 case VIDBUF8: 161 return object->Bitmap[((y*object->VXsize)+x)]; 162 case VIDBUF8S: 163 return object->Bitmap[VGLSetSegment(y*object->VXsize+x)]; 164 case VIDBUF16: 165 case VIDBUF24: 166 case VIDBUF32: 167 bcopy(&object->Bitmap[(y*object->VXsize+x) * object->PixelBytes], 168 b, object->PixelBytes); 169 return (mem2color(b, object->PixelBytes)); 170 case VIDBUF16S: 171 case VIDBUF24S: 172 case VIDBUF32S: 173 offset = VGLSetSegment((y*object->VXsize+x) * object->PixelBytes); 174 bcopy(&object->Bitmap[offset], b, object->PixelBytes); 175 176 return (mem2color(b, object->PixelBytes)); 177 case VIDBUF8X: 178 outb(0x3ce, 0x04); outb(0x3cf, x & 0x3); 179 return object->Bitmap[(unsigned)(VGLAdpInfo.va_line_width*y)+(x/4)]; 180 case VIDBUF4S: 181 offset = VGLSetSegment(y*VGLAdpInfo.va_line_width + x/8); 182 goto get_planar; 183 case VIDBUF4: 184 offset = y*VGLAdpInfo.va_line_width + x/8; 185 get_planar: 186 #if 1 187 return (object->Bitmap[offset]&(0x80>>(x%8))) ? 1 : 0; /* XXX */ 188 #else 189 color = 0; 190 mask = 0x80 >> (x%8); 191 for (i = 0; i < VGLModeInfo.vi_planes; i++) { 192 outb(0x3ce, 0x04); outb(0x3cf, i); 193 color |= (object->Bitmap[offset] & mask) ? (1 << i) : 0; 194 } 195 return color; 196 #endif 197 } 198 return 0; /* XXX black? */ 199 } 200 201 /* 202 * Symmetric Double Step Line Algorithm by Brian Wyvill from 203 * "Graphics Gems", Academic Press, 1990. 204 */ 205 206 #define SL_SWAP(a,b) {a^=b; b^=a; a^=b;} 207 #define SL_ABSOLUTE(i,j,k) ( (i-j)*(k = ( (i-j)<0 ? -1 : 1))) 208 209 void 210 plot(VGLBitmap * object, int x, int y, int flag, byte color) 211 { 212 /* non-zero flag indicates the pixels need swapping back. */ 213 if (flag) 214 VGLSetXY(object, y, x, color); 215 else 216 VGLSetXY(object, x, y, color); 217 } 218 219 220 void 221 VGLLine(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color) 222 { 223 int dx, dy, incr1, incr2, D, x, y, xend, c, pixels_left; 224 int sign_x, sign_y, step, reverse, i; 225 226 dx = SL_ABSOLUTE(x2, x1, sign_x); 227 dy = SL_ABSOLUTE(y2, y1, sign_y); 228 /* decide increment sign by the slope sign */ 229 if (sign_x == sign_y) 230 step = 1; 231 else 232 step = -1; 233 234 if (dy > dx) { /* chooses axis of greatest movement (make dx) */ 235 SL_SWAP(x1, y1); 236 SL_SWAP(x2, y2); 237 SL_SWAP(dx, dy); 238 reverse = 1; 239 } else 240 reverse = 0; 241 /* note error check for dx==0 should be included here */ 242 if (x1 > x2) { /* start from the smaller coordinate */ 243 x = x2; 244 y = y2; 245 /* x1 = x1; 246 y1 = y1; */ 247 } else { 248 x = x1; 249 y = y1; 250 x1 = x2; 251 y1 = y2; 252 } 253 254 255 /* Note dx=n implies 0 - n or (dx+1) pixels to be set */ 256 /* Go round loop dx/4 times then plot last 0,1,2 or 3 pixels */ 257 /* In fact (dx-1)/4 as 2 pixels are already plotted */ 258 xend = (dx - 1) / 4; 259 pixels_left = (dx - 1) % 4; /* number of pixels left over at the 260 * end */ 261 plot(object, x, y, reverse, color); 262 if (pixels_left < 0) 263 return; /* plot only one pixel for zero length 264 * vectors */ 265 plot(object, x1, y1, reverse, color); /* plot first two points */ 266 incr2 = 4 * dy - 2 * dx; 267 if (incr2 < 0) { /* slope less than 1/2 */ 268 c = 2 * dy; 269 incr1 = 2 * c; 270 D = incr1 - dx; 271 272 for (i = 0; i < xend; i++) { /* plotting loop */ 273 ++x; 274 --x1; 275 if (D < 0) { 276 /* pattern 1 forwards */ 277 plot(object, x, y, reverse, color); 278 plot(object, ++x, y, reverse, color); 279 /* pattern 1 backwards */ 280 plot(object, x1, y1, reverse, color); 281 plot(object, --x1, y1, reverse, color); 282 D += incr1; 283 } else { 284 if (D < c) { 285 /* pattern 2 forwards */ 286 plot(object, x, y, reverse, color); 287 plot(object, ++x, y += step, reverse, 288 color); 289 /* pattern 2 backwards */ 290 plot(object, x1, y1, reverse, color); 291 plot(object, --x1, y1 -= step, reverse, 292 color); 293 } else { 294 /* pattern 3 forwards */ 295 plot(object, x, y += step, reverse, color); 296 plot(object, ++x, y, reverse, color); 297 /* pattern 3 backwards */ 298 plot(object, x1, y1 -= step, reverse, 299 color); 300 plot(object, --x1, y1, reverse, color); 301 } 302 D += incr2; 303 } 304 } /* end for */ 305 306 /* plot last pattern */ 307 if (pixels_left) { 308 if (D < 0) { 309 plot(object, ++x, y, reverse, color); /* pattern 1 */ 310 if (pixels_left > 1) 311 plot(object, ++x, y, reverse, color); 312 if (pixels_left > 2) 313 plot(object, --x1, y1, reverse, color); 314 } else { 315 if (D < c) { 316 plot(object, ++x, y, reverse, color); /* pattern 2 */ 317 if (pixels_left > 1) 318 plot(object, ++x, y += step, reverse, color); 319 if (pixels_left > 2) 320 plot(object, --x1, y1, reverse, color); 321 } else { 322 /* pattern 3 */ 323 plot(object, ++x, y += step, reverse, color); 324 if (pixels_left > 1) 325 plot(object, ++x, y, reverse, color); 326 if (pixels_left > 2) 327 plot(object, --x1, y1 -= step, reverse, color); 328 } 329 } 330 } /* end if pixels_left */ 331 } 332 /* end slope < 1/2 */ 333 else { /* slope greater than 1/2 */ 334 c = 2 * (dy - dx); 335 incr1 = 2 * c; 336 D = incr1 + dx; 337 for (i = 0; i < xend; i++) { 338 ++x; 339 --x1; 340 if (D > 0) { 341 /* pattern 4 forwards */ 342 plot(object, x, y += step, reverse, color); 343 plot(object, ++x, y += step, reverse, color); 344 /* pattern 4 backwards */ 345 plot(object, x1, y1 -= step, reverse, color); 346 plot(object, --x1, y1 -= step, reverse, color); 347 D += incr1; 348 } else { 349 if (D < c) { 350 /* pattern 2 forwards */ 351 plot(object, x, y, reverse, color); 352 plot(object, ++x, y += step, reverse, 353 color); 354 355 /* pattern 2 backwards */ 356 plot(object, x1, y1, reverse, color); 357 plot(object, --x1, y1 -= step, reverse, 358 color); 359 } else { 360 /* pattern 3 forwards */ 361 plot(object, x, y += step, reverse, color); 362 plot(object, ++x, y, reverse, color); 363 /* pattern 3 backwards */ 364 plot(object, x1, y1 -= step, reverse, color); 365 plot(object, --x1, y1, reverse, color); 366 } 367 D += incr2; 368 } 369 } /* end for */ 370 /* plot last pattern */ 371 if (pixels_left) { 372 if (D > 0) { 373 plot(object, ++x, y += step, reverse, color); /* pattern 4 */ 374 if (pixels_left > 1) 375 plot(object, ++x, y += step, reverse, 376 color); 377 if (pixels_left > 2) 378 plot(object, --x1, y1 -= step, reverse, 379 color); 380 } else { 381 if (D < c) { 382 plot(object, ++x, y, reverse, color); /* pattern 2 */ 383 if (pixels_left > 1) 384 plot(object, ++x, y += step, reverse, color); 385 if (pixels_left > 2) 386 plot(object, --x1, y1, reverse, color); 387 } else { 388 /* pattern 3 */ 389 plot(object, ++x, y += step, reverse, color); 390 if (pixels_left > 1) 391 plot(object, ++x, y, reverse, color); 392 if (pixels_left > 2) { 393 if (D > c) /* step 3 */ 394 plot(object, --x1, y1 -= step, reverse, color); 395 else /* step 2 */ 396 plot(object, --x1, y1, reverse, color); 397 } 398 } 399 } 400 } 401 } 402 } 403 404 void 405 VGLBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color) 406 { 407 VGLLine(object, x1, y1, x2, y1, color); 408 VGLLine(object, x2, y1, x2, y2, color); 409 VGLLine(object, x2, y2, x1, y2, color); 410 VGLLine(object, x1, y2, x1, y1, color); 411 } 412 413 void 414 VGLFilledBox(VGLBitmap *object, int x1, int y1, int x2, int y2, u_long color) 415 { 416 int y; 417 418 for (y=y1; y<=y2; y++) VGLLine(object, x1, y, x2, y, color); 419 } 420 421 static inline void 422 set4pixels(VGLBitmap *object, int x, int y, int xc, int yc, u_long color) 423 { 424 if (x!=0) { 425 VGLSetXY(object, xc+x, yc+y, color); 426 VGLSetXY(object, xc-x, yc+y, color); 427 if (y!=0) { 428 VGLSetXY(object, xc+x, yc-y, color); 429 VGLSetXY(object, xc-x, yc-y, color); 430 } 431 } 432 else { 433 VGLSetXY(object, xc, yc+y, color); 434 if (y!=0) 435 VGLSetXY(object, xc, yc-y, color); 436 } 437 } 438 439 void 440 VGLEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color) 441 { 442 int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b; 443 int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b; 444 445 while (dx<dy) { 446 set4pixels(object, x, y, xc, yc, color); 447 if (d>0) { 448 y--; dy-=asq2; d-=dy; 449 } 450 x++; dx+=bsq2; d+=bsq+dx; 451 } 452 d+=(3*(asq-bsq)/2-(dx+dy))/2; 453 while (y>=0) { 454 set4pixels(object, x, y, xc, yc, color); 455 if (d<0) { 456 x++; dx+=bsq2; d+=dx; 457 } 458 y--; dy-=asq2; d+=asq-dy; 459 } 460 } 461 462 static inline void 463 set2lines(VGLBitmap *object, int x, int y, int xc, int yc, u_long color) 464 { 465 if (x!=0) { 466 VGLLine(object, xc+x, yc+y, xc-x, yc+y, color); 467 if (y!=0) 468 VGLLine(object, xc+x, yc-y, xc-x, yc-y, color); 469 } 470 else { 471 VGLLine(object, xc, yc+y, xc, yc-y, color); 472 } 473 } 474 475 void 476 VGLFilledEllipse(VGLBitmap *object, int xc, int yc, int a, int b, u_long color) 477 { 478 int x = 0, y = b, asq = a*a, asq2 = a*a*2, bsq = b*b; 479 int bsq2 = b*b*2, d = bsq-asq*b+asq/4, dx = 0, dy = asq2*b; 480 481 while (dx<dy) { 482 set2lines(object, x, y, xc, yc, color); 483 if (d>0) { 484 y--; dy-=asq2; d-=dy; 485 } 486 x++; dx+=bsq2; d+=bsq+dx; 487 } 488 d+=(3*(asq-bsq)/2-(dx+dy))/2; 489 while (y>=0) { 490 set2lines(object, x, y, xc, yc, color); 491 if (d<0) { 492 x++; dx+=bsq2; d+=dx; 493 } 494 y--; dy-=asq2; d+=asq-dy; 495 } 496 } 497 498 void 499 VGLClear(VGLBitmap *object, u_long color) 500 { 501 int offset; 502 int len; 503 int i, total = 0; 504 byte b[4]; 505 506 VGLCheckSwitch(); 507 VGLMouseFreeze(0, 0, object->Xsize, object->Ysize, color); /* XXX */ 508 switch (object->Type) { 509 case MEMBUF: 510 case VIDBUF8: 511 memset(object->Bitmap, (byte)color, object->VXsize*object->VYsize); 512 break; 513 514 case VIDBUF8S: 515 for (offset = 0; offset < object->VXsize*object->VYsize; ) { 516 VGLSetSegment(offset); 517 len = min(object->VXsize*object->VYsize - offset, 518 VGLAdpInfo.va_window_size); 519 memset(object->Bitmap, (byte)color, len); 520 offset += len; 521 } 522 break; 523 case VIDBUF16: 524 case VIDBUF24: 525 case VIDBUF32: 526 color2mem(color, b, object->PixelBytes); 527 total = object->VXsize*object->VYsize*object->PixelBytes; 528 for (i = 0; i < total; i += object->PixelBytes) 529 bcopy(b, object->Bitmap + i, object->PixelBytes); 530 break; 531 532 case VIDBUF16S: 533 case VIDBUF24S: 534 case VIDBUF32S: 535 color2mem(color, b, object->PixelBytes); 536 total = object->VXsize*object->VYsize*object->PixelBytes; 537 for (offset = 0; offset < total; ) { 538 VGLSetSegment(offset); 539 len = min(total - offset, VGLAdpInfo.va_window_size); 540 for (i = 0; i < len; i += object->PixelBytes) 541 bcopy(b, object->Bitmap + offset + i, object->PixelBytes); 542 offset += len; 543 } 544 break; 545 546 case VIDBUF8X: 547 /* XXX works only for Xsize % 4 = 0 */ 548 outb(0x3c6, 0xff); 549 outb(0x3c4, 0x02); outb(0x3c5, 0x0f); 550 memset(object->Bitmap, (byte)color, VGLAdpInfo.va_line_width*object->VYsize); 551 break; 552 553 case VIDBUF4: 554 case VIDBUF4S: 555 /* XXX works only for Xsize % 8 = 0 */ 556 outb(0x3c4, 0x02); outb(0x3c5, 0x0f); 557 outb(0x3ce, 0x05); outb(0x3cf, 0x02); /* mode 2 */ 558 outb(0x3ce, 0x01); outb(0x3cf, 0x00); /* set/reset enable */ 559 outb(0x3ce, 0x08); outb(0x3cf, 0xff); /* bit mask */ 560 for (offset = 0; offset < VGLAdpInfo.va_line_width*object->VYsize; ) { 561 VGLSetSegment(offset); 562 len = min(object->VXsize*object->VYsize - offset, 563 VGLAdpInfo.va_window_size); 564 memset(object->Bitmap, (byte)color, len); 565 offset += len; 566 } 567 outb(0x3ce, 0x05); outb(0x3cf, 0x00); 568 break; 569 } 570 VGLMouseUnFreeze(); 571 } 572 573 void 574 VGLRestorePalette() 575 { 576 int i; 577 578 outb(0x3C6, 0xFF); 579 inb(0x3DA); 580 outb(0x3C8, 0x00); 581 for (i=0; i<256; i++) { 582 outb(0x3C9, VGLSavePaletteRed[i]); 583 inb(0x84); 584 outb(0x3C9, VGLSavePaletteGreen[i]); 585 inb(0x84); 586 outb(0x3C9, VGLSavePaletteBlue[i]); 587 inb(0x84); 588 } 589 inb(0x3DA); 590 outb(0x3C0, 0x20); 591 } 592 593 void 594 VGLSavePalette() 595 { 596 int i; 597 598 outb(0x3C6, 0xFF); 599 inb(0x3DA); 600 outb(0x3C7, 0x00); 601 for (i=0; i<256; i++) { 602 VGLSavePaletteRed[i] = inb(0x3C9); 603 inb(0x84); 604 VGLSavePaletteGreen[i] = inb(0x3C9); 605 inb(0x84); 606 VGLSavePaletteBlue[i] = inb(0x3C9); 607 inb(0x84); 608 } 609 inb(0x3DA); 610 outb(0x3C0, 0x20); 611 } 612 613 void 614 VGLSetPalette(byte *red, byte *green, byte *blue) 615 { 616 int i; 617 618 for (i=0; i<256; i++) { 619 VGLSavePaletteRed[i] = red[i]; 620 VGLSavePaletteGreen[i] = green[i]; 621 VGLSavePaletteBlue[i] = blue[i]; 622 } 623 VGLCheckSwitch(); 624 outb(0x3C6, 0xFF); 625 inb(0x3DA); 626 outb(0x3C8, 0x00); 627 for (i=0; i<256; i++) { 628 outb(0x3C9, VGLSavePaletteRed[i]); 629 inb(0x84); 630 outb(0x3C9, VGLSavePaletteGreen[i]); 631 inb(0x84); 632 outb(0x3C9, VGLSavePaletteBlue[i]); 633 inb(0x84); 634 } 635 inb(0x3DA); 636 outb(0x3C0, 0x20); 637 } 638 639 void 640 VGLSetPaletteIndex(byte color, byte red, byte green, byte blue) 641 { 642 VGLSavePaletteRed[color] = red; 643 VGLSavePaletteGreen[color] = green; 644 VGLSavePaletteBlue[color] = blue; 645 VGLCheckSwitch(); 646 outb(0x3C6, 0xFF); 647 inb(0x3DA); 648 outb(0x3C8, color); 649 outb(0x3C9, red); outb(0x3C9, green); outb(0x3C9, blue); 650 inb(0x3DA); 651 outb(0x3C0, 0x20); 652 } 653 654 void 655 VGLSetBorder(byte color) 656 { 657 VGLCheckSwitch(); 658 inb(0x3DA); 659 outb(0x3C0,0x11); outb(0x3C0, color); 660 inb(0x3DA); 661 outb(0x3C0, 0x20); 662 } 663 664 void 665 VGLBlankDisplay(int blank) 666 { 667 byte val; 668 669 VGLCheckSwitch(); 670 outb(0x3C4, 0x01); val = inb(0x3C5); outb(0x3C4, 0x01); 671 outb(0x3C5, ((blank) ? (val |= 0x20) : (val &= 0xDF))); 672 } 673