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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 | /* * linux/drivers/video/vgastate.c -- VGA state save/restore * * Copyright 2002 James Simmons * * Copyright history from vga16fb.c: * Copyright 1999 Ben Pfaff and Petr Vandrovec * Based on VGA info at http://www.goodnet.com/~tinara/FreeVGA/home.htm * Based on VESA framebuffer (c) 1998 Gerd Knorr * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * */ #include <linux/config.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/fb.h> #include <linux/vmalloc.h> #include <video/vga.h> struct regstate { __u8 *vga_font0; __u8 *vga_font1; __u8 *vga_text; __u8 *vga_cmap; __u8 *attr; __u8 *crtc; __u8 *gfx; __u8 *seq; __u8 misc; }; static inline unsigned char vga_rcrtcs(void __iomem *regbase, unsigned short iobase, unsigned char reg) { vga_w(regbase, iobase + 0x4, reg); return vga_r(regbase, iobase + 0x5); } static inline void vga_wcrtcs(void __iomem *regbase, unsigned short iobase, unsigned char reg, unsigned char val) { vga_w(regbase, iobase + 0x4, reg); vga_w(regbase, iobase + 0x5, val); } static void save_vga_text(struct vgastate *state, void __iomem *fbbase) { struct regstate *saved = (struct regstate *) state->vidstate; int i; u8 misc, attr10, gr4, gr5, gr6, seq1, seq2, seq4; /* if in graphics mode, no need to save */ attr10 = vga_rattr(state->vgabase, 0x10); if (attr10 & 1) return; /* save regs */ misc = vga_r(state->vgabase, VGA_MIS_R); gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ); gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE); gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC); seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE); seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE); /* force graphics mode */ vga_w(state->vgabase, VGA_MIS_W, misc | 1); /* blank screen */ seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); /* save font at plane 2 */ if (state->flags & VGA_SAVE_FONT0) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 4 * 8192; i++) saved->vga_font0[i] = vga_r(fbbase, i); } /* save font at plane 3 */ if (state->flags & VGA_SAVE_FONT1) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < state->memsize; i++) saved->vga_font1[i] = vga_r(fbbase, i); } /* save font at plane 0/1 */ if (state->flags & VGA_SAVE_TEXT) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 8192; i++) saved->vga_text[i] = vga_r(fbbase, i); vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 8192; i++) saved->vga_text[8192+i] = vga_r(fbbase + 2 * 8192, i); } /* restore regs */ vga_wattr(state->vgabase, 0x10, attr10); vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4); vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5); vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6); vga_w(state->vgabase, VGA_MIS_W, misc); /* unblank screen */ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5)); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1); } static void restore_vga_text(struct vgastate *state, void __iomem *fbbase) { struct regstate *saved = (struct regstate *) state->vidstate; int i; u8 misc, gr1, gr3, gr4, gr5, gr6, gr8; u8 seq1, seq2, seq4; /* save regs */ misc = vga_r(state->vgabase, VGA_MIS_R); gr1 = vga_rgfx(state->vgabase, VGA_GFX_SR_ENABLE); gr3 = vga_rgfx(state->vgabase, VGA_GFX_DATA_ROTATE); gr4 = vga_rgfx(state->vgabase, VGA_GFX_PLANE_READ); gr5 = vga_rgfx(state->vgabase, VGA_GFX_MODE); gr6 = vga_rgfx(state->vgabase, VGA_GFX_MISC); gr8 = vga_rgfx(state->vgabase, VGA_GFX_BIT_MASK); seq2 = vga_rseq(state->vgabase, VGA_SEQ_PLANE_WRITE); seq4 = vga_rseq(state->vgabase, VGA_SEQ_MEMORY_MODE); /* force graphics mode */ vga_w(state->vgabase, VGA_MIS_W, misc | 1); /* blank screen */ seq1 = vga_rseq(state->vgabase, VGA_SEQ_CLOCK_MODE); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 | 1 << 5); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); if (state->depth == 4) { vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, 0xff); vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, 0x00); } /* restore font at plane 2 */ if (state->flags & VGA_SAVE_FONT0) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x4); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x2); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 4 * 8192; i++) vga_w(fbbase, i, saved->vga_font0[i]); } /* restore font at plane 3 */ if (state->flags & VGA_SAVE_FONT1) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x8); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x3); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < state->memsize; i++) vga_w(fbbase, i, saved->vga_font1[i]); } /* restore font at plane 0/1 */ if (state->flags & VGA_SAVE_TEXT) { vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x1); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 8192; i++) vga_w(fbbase, i, saved->vga_text[i]); vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, 0x2); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, 0x6); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, 0x1); vga_wgfx(state->vgabase, VGA_GFX_MODE, 0x0); vga_wgfx(state->vgabase, VGA_GFX_MISC, 0x5); for (i = 0; i < 8192; i++) vga_w(fbbase, i, saved->vga_text[8192+i]); } /* unblank screen */ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x1); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1 & ~(1 << 5)); vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x3); /* restore regs */ vga_w(state->vgabase, VGA_MIS_W, misc); vga_wgfx(state->vgabase, VGA_GFX_SR_ENABLE, gr1); vga_wgfx(state->vgabase, VGA_GFX_DATA_ROTATE, gr3); vga_wgfx(state->vgabase, VGA_GFX_PLANE_READ, gr4); vga_wgfx(state->vgabase, VGA_GFX_MODE, gr5); vga_wgfx(state->vgabase, VGA_GFX_MISC, gr6); vga_wgfx(state->vgabase, VGA_GFX_BIT_MASK, gr8); vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, seq1); vga_wseq(state->vgabase, VGA_SEQ_PLANE_WRITE, seq2); vga_wseq(state->vgabase, VGA_SEQ_MEMORY_MODE, seq4); } static void save_vga_mode(struct vgastate *state) { struct regstate *saved = (struct regstate *) state->vidstate; unsigned short iobase; int i; saved->misc = vga_r(state->vgabase, VGA_MIS_R); if (saved->misc & 1) iobase = 0x3d0; else iobase = 0x3b0; for (i = 0; i < state->num_crtc; i++) saved->crtc[i] = vga_rcrtcs(state->vgabase, iobase, i); vga_r(state->vgabase, iobase + 0xa); vga_w(state->vgabase, VGA_ATT_W, 0x00); for (i = 0; i < state->num_attr; i++) { vga_r(state->vgabase, iobase + 0xa); saved->attr[i] = vga_rattr(state->vgabase, i); } vga_r(state->vgabase, iobase + 0xa); vga_w(state->vgabase, VGA_ATT_W, 0x20); for (i = 0; i < state->num_gfx; i++) saved->gfx[i] = vga_rgfx(state->vgabase, i); for (i = 0; i < state->num_seq; i++) saved->seq[i] = vga_rseq(state->vgabase, i); } static void restore_vga_mode(struct vgastate *state) { struct regstate *saved = (struct regstate *) state->vidstate; unsigned short iobase; int i; vga_w(state->vgabase, VGA_MIS_W, saved->misc); if (saved->misc & 1) iobase = 0x3d0; else iobase = 0x3b0; /* turn off display */ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, saved->seq[VGA_SEQ_CLOCK_MODE] | 0x20); /* disable sequencer */ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x01); /* enable palette addressing */ vga_r(state->vgabase, iobase + 0xa); vga_w(state->vgabase, VGA_ATT_W, 0x00); for (i = 2; i < state->num_seq; i++) vga_wseq(state->vgabase, i, saved->seq[i]); /* unprotect vga regs */ vga_wcrtcs(state->vgabase, iobase, 17, saved->crtc[17] & ~0x80); for (i = 0; i < state->num_crtc; i++) vga_wcrtcs(state->vgabase, iobase, i, saved->crtc[i]); for (i = 0; i < state->num_gfx; i++) vga_wgfx(state->vgabase, i, saved->gfx[i]); for (i = 0; i < state->num_attr; i++) { vga_r(state->vgabase, iobase + 0xa); vga_wattr(state->vgabase, i, saved->attr[i]); } /* reenable sequencer */ vga_wseq(state->vgabase, VGA_SEQ_RESET, 0x03); /* turn display on */ vga_wseq(state->vgabase, VGA_SEQ_CLOCK_MODE, saved->seq[VGA_SEQ_CLOCK_MODE] & ~(1 << 5)); /* disable video/palette source */ vga_r(state->vgabase, iobase + 0xa); vga_w(state->vgabase, VGA_ATT_W, 0x20); } static void save_vga_cmap(struct vgastate *state) { struct regstate *saved = (struct regstate *) state->vidstate; int i; vga_w(state->vgabase, VGA_PEL_MSK, 0xff); /* assumes DAC is readable and writable */ vga_w(state->vgabase, VGA_PEL_IR, 0x00); for (i = 0; i < 768; i++) saved->vga_cmap[i] = vga_r(state->vgabase, VGA_PEL_D); } static void restore_vga_cmap(struct vgastate *state) { struct regstate *saved = (struct regstate *) state->vidstate; int i; vga_w(state->vgabase, VGA_PEL_MSK, 0xff); /* assumes DAC is readable and writable */ vga_w(state->vgabase, VGA_PEL_IW, 0x00); for (i = 0; i < 768; i++) vga_w(state->vgabase, VGA_PEL_D, saved->vga_cmap[i]); } static void vga_cleanup(struct vgastate *state) { if (state->vidstate != NULL) { struct regstate *saved = (struct regstate *) state->vidstate; if (saved->vga_font0) vfree(saved->vga_font0); if (saved->vga_font1) vfree(saved->vga_font1); if (saved->vga_text) vfree(saved->vga_text); if (saved->vga_cmap) vfree(saved->vga_cmap); if (saved->attr) vfree(saved->attr); kfree(saved); state->vidstate = NULL; } } int save_vga(struct vgastate *state) { struct regstate *saved; saved = kmalloc(sizeof(struct regstate), GFP_KERNEL); if (saved == NULL) return 1; memset (saved, 0, sizeof(struct regstate)); state->vidstate = (void *)saved; if (state->flags & VGA_SAVE_CMAP) { saved->vga_cmap = vmalloc(768); if (!saved->vga_cmap) { vga_cleanup(state); return 1; } save_vga_cmap(state); } if (state->flags & VGA_SAVE_MODE) { int total; if (state->num_attr < 21) state->num_attr = 21; if (state->num_crtc < 25) state->num_crtc = 25; if (state->num_gfx < 9) state->num_gfx = 9; if (state->num_seq < 5) state->num_seq = 5; total = state->num_attr + state->num_crtc + state->num_gfx + state->num_seq; saved->attr = vmalloc(total); if (!saved->attr) { vga_cleanup(state); return 1; } saved->crtc = saved->attr + state->num_attr; saved->gfx = saved->crtc + state->num_crtc; saved->seq = saved->gfx + state->num_gfx; save_vga_mode(state); } if (state->flags & VGA_SAVE_FONTS) { void __iomem *fbbase; /* exit if window is less than 32K */ if (state->memsize && state->memsize < 4 * 8192) { vga_cleanup(state); return 1; } if (!state->memsize) state->memsize = 8 * 8192; if (!state->membase) state->membase = 0xA0000; fbbase = ioremap(state->membase, state->memsize); if (!fbbase) { vga_cleanup(state); return 1; } /* * save only first 32K used by vgacon */ if (state->flags & VGA_SAVE_FONT0) { saved->vga_font0 = vmalloc(4 * 8192); if (!saved->vga_font0) { iounmap(fbbase); vga_cleanup(state); return 1; } } /* * largely unused, but if required by the caller * we'll just save everything. */ if (state->flags & VGA_SAVE_FONT1) { saved->vga_font1 = vmalloc(state->memsize); if (!saved->vga_font1) { iounmap(fbbase); vga_cleanup(state); return 1; } } /* * Save 8K at plane0[0], and 8K at plane1[16K] */ if (state->flags & VGA_SAVE_TEXT) { saved->vga_text = vmalloc(8192 * 2); if (!saved->vga_text) { iounmap(fbbase); vga_cleanup(state); return 1; } } save_vga_text(state, fbbase); iounmap(fbbase); } return 0; } int restore_vga (struct vgastate *state) { if (state->vidstate == NULL) return 1; if (state->flags & VGA_SAVE_MODE) restore_vga_mode(state); if (state->flags & VGA_SAVE_FONTS) { void __iomem *fbbase = ioremap(state->membase, state->memsize); if (!fbbase) { vga_cleanup(state); return 1; } restore_vga_text(state, fbbase); iounmap(fbbase); } if (state->flags & VGA_SAVE_CMAP) restore_vga_cmap(state); vga_cleanup(state); return 0; } #ifdef MODULE int init_module(void) { return 0; }; void cleanup_module(void) {}; #endif EXPORT_SYMBOL(save_vga); EXPORT_SYMBOL(restore_vga); MODULE_AUTHOR("James Simmons <jsimmons@users.sf.net>"); MODULE_DESCRIPTION("VGA State Save/Restore"); MODULE_LICENSE("GPL"); |