1 /* 2 * QEMU EDID generator. 3 * 4 * This work is licensed under the terms of the GNU GPL, version 2 or later. 5 * See the COPYING file in the top-level directory. 6 */ 7 #include "qemu/osdep.h" 8 #include "qemu/bswap.h" 9 #include "hw/display/edid.h" 10 11 static const struct edid_mode { 12 uint32_t xres; 13 uint32_t yres; 14 uint32_t byte; 15 uint32_t xtra3; 16 uint32_t bit; 17 uint32_t dta; 18 } modes[] = { 19 /* dea/dta extension timings (all @ 50 Hz) */ 20 { .xres = 5120, .yres = 2160, .dta = 125 }, 21 { .xres = 4096, .yres = 2160, .dta = 101 }, 22 { .xres = 3840, .yres = 2160, .dta = 96 }, 23 { .xres = 2560, .yres = 1080, .dta = 89 }, 24 { .xres = 2048, .yres = 1152 }, 25 { .xres = 1920, .yres = 1080, .dta = 31 }, 26 27 /* additional standard timings 3 (all @ 60Hz) */ 28 { .xres = 1920, .yres = 1200, .xtra3 = 10, .bit = 0 }, 29 { .xres = 1600, .yres = 1200, .xtra3 = 9, .bit = 2 }, 30 { .xres = 1680, .yres = 1050, .xtra3 = 9, .bit = 5 }, 31 { .xres = 1440, .yres = 900, .xtra3 = 8, .bit = 5 }, 32 { .xres = 1280, .yres = 1024, .xtra3 = 7, .bit = 1 }, 33 { .xres = 1280, .yres = 960, .xtra3 = 7, .bit = 3 }, 34 { .xres = 1280, .yres = 768, .xtra3 = 7, .bit = 6 }, 35 36 { .xres = 1920, .yres = 1440, .xtra3 = 11, .bit = 5 }, 37 { .xres = 1856, .yres = 1392, .xtra3 = 10, .bit = 3 }, 38 { .xres = 1792, .yres = 1344, .xtra3 = 10, .bit = 5 }, 39 { .xres = 1440, .yres = 1050, .xtra3 = 8, .bit = 1 }, 40 { .xres = 1360, .yres = 768, .xtra3 = 8, .bit = 7 }, 41 42 /* established timings (all @ 60Hz) */ 43 { .xres = 1024, .yres = 768, .byte = 36, .bit = 3 }, 44 { .xres = 800, .yres = 600, .byte = 35, .bit = 0 }, 45 { .xres = 640, .yres = 480, .byte = 35, .bit = 5 }, 46 }; 47 48 static void edid_ext_dta(uint8_t *dta) 49 { 50 dta[0] = 0x02; 51 dta[1] = 0x03; 52 dta[2] = 0x05; 53 dta[3] = 0x00; 54 55 /* video data block */ 56 dta[4] = 0x40; 57 } 58 59 static void edid_ext_dta_mode(uint8_t *dta, uint8_t nr) 60 { 61 dta[dta[2]] = nr; 62 dta[2]++; 63 dta[4]++; 64 } 65 66 static int edid_std_mode(uint8_t *mode, uint32_t xres, uint32_t yres) 67 { 68 uint32_t aspect; 69 70 if (xres == 0 || yres == 0) { 71 mode[0] = 0x01; 72 mode[1] = 0x01; 73 return 0; 74 75 } else if (xres * 10 == yres * 16) { 76 aspect = 0; 77 } else if (xres * 3 == yres * 4) { 78 aspect = 1; 79 } else if (xres * 4 == yres * 5) { 80 aspect = 2; 81 } else if (xres * 9 == yres * 16) { 82 aspect = 3; 83 } else { 84 return -1; 85 } 86 87 if ((xres / 8) - 31 > 255) { 88 return -1; 89 } 90 91 mode[0] = (xres / 8) - 31; 92 mode[1] = ((aspect << 6) | (60 - 60)); 93 return 0; 94 } 95 96 static void edid_fill_modes(uint8_t *edid, uint8_t *xtra3, uint8_t *dta, 97 uint32_t maxx, uint32_t maxy) 98 { 99 const struct edid_mode *mode; 100 int std = 38; 101 int rc, i; 102 103 for (i = 0; i < ARRAY_SIZE(modes); i++) { 104 mode = modes + i; 105 106 if ((maxx && mode->xres > maxx) || 107 (maxy && mode->yres > maxy)) { 108 continue; 109 } 110 111 if (mode->byte) { 112 edid[mode->byte] |= (1 << mode->bit); 113 } else if (std < 54) { 114 rc = edid_std_mode(edid + std, mode->xres, mode->yres); 115 if (rc == 0) { 116 std += 2; 117 } 118 } else if (mode->xtra3 && xtra3) { 119 xtra3[mode->xtra3] |= (1 << mode->bit); 120 } 121 122 if (dta && mode->dta) { 123 edid_ext_dta_mode(dta, mode->dta); 124 } 125 } 126 127 while (std < 54) { 128 edid_std_mode(edid + std, 0, 0); 129 std += 2; 130 } 131 } 132 133 static void edid_checksum(uint8_t *edid) 134 { 135 uint32_t sum = 0; 136 int i; 137 138 for (i = 0; i < 127; i++) { 139 sum += edid[i]; 140 } 141 sum &= 0xff; 142 if (sum) { 143 edid[127] = 0x100 - sum; 144 } 145 } 146 147 static void edid_desc_type(uint8_t *desc, uint8_t type) 148 { 149 desc[0] = 0; 150 desc[1] = 0; 151 desc[2] = 0; 152 desc[3] = type; 153 desc[4] = 0; 154 } 155 156 static void edid_desc_text(uint8_t *desc, uint8_t type, 157 const char *text) 158 { 159 size_t len; 160 161 edid_desc_type(desc, type); 162 memset(desc + 5, ' ', 13); 163 164 len = strlen(text); 165 if (len > 12) { 166 len = 12; 167 } 168 memcpy(desc + 5, text, len); 169 desc[5 + len] = '\n'; 170 } 171 172 static void edid_desc_ranges(uint8_t *desc) 173 { 174 edid_desc_type(desc, 0xfd); 175 176 /* vertical (50 -> 125 Hz) */ 177 desc[5] = 50; 178 desc[6] = 125; 179 180 /* horizontal (30 -> 160 kHz) */ 181 desc[7] = 30; 182 desc[8] = 160; 183 184 /* max dot clock (1200 MHz) */ 185 desc[9] = 1200 / 10; 186 187 /* no extended timing information */ 188 desc[10] = 0x01; 189 190 /* padding */ 191 desc[11] = '\n'; 192 memset(desc + 12, ' ', 6); 193 } 194 195 /* additional standard timings 3 */ 196 static void edid_desc_xtra3_std(uint8_t *desc) 197 { 198 edid_desc_type(desc, 0xf7); 199 desc[5] = 10; 200 } 201 202 static void edid_desc_dummy(uint8_t *desc) 203 { 204 edid_desc_type(desc, 0x10); 205 } 206 207 static void edid_desc_timing(uint8_t *desc, 208 uint32_t xres, uint32_t yres, 209 uint32_t xmm, uint32_t ymm) 210 { 211 /* pull some realistic looking timings out of thin air */ 212 uint32_t xfront = xres * 25 / 100; 213 uint32_t xsync = xres * 3 / 100; 214 uint32_t xblank = xres * 35 / 100; 215 216 uint32_t yfront = yres * 5 / 1000; 217 uint32_t ysync = yres * 5 / 1000; 218 uint32_t yblank = yres * 35 / 1000; 219 220 uint32_t clock = 75 * (xres + xblank) * (yres + yblank); 221 222 stl_le_p(desc, clock / 10000); 223 224 desc[2] = xres & 0xff; 225 desc[3] = xblank & 0xff; 226 desc[4] = (((xres & 0xf00) >> 4) | 227 ((xblank & 0xf00) >> 8)); 228 229 desc[5] = yres & 0xff; 230 desc[6] = yblank & 0xff; 231 desc[7] = (((yres & 0xf00) >> 4) | 232 ((yblank & 0xf00) >> 8)); 233 234 desc[8] = xfront & 0xff; 235 desc[9] = xsync & 0xff; 236 237 desc[10] = (((yfront & 0x00f) << 4) | 238 ((ysync & 0x00f) << 0)); 239 desc[11] = (((xfront & 0x300) >> 2) | 240 ((xsync & 0x300) >> 4) | 241 ((yfront & 0x030) >> 2) | 242 ((ysync & 0x030) >> 4)); 243 244 desc[12] = xmm & 0xff; 245 desc[13] = ymm & 0xff; 246 desc[14] = (((xmm & 0xf00) >> 4) | 247 ((ymm & 0xf00) >> 8)); 248 249 desc[17] = 0x18; 250 } 251 252 static uint32_t edid_to_10bit(float value) 253 { 254 return (uint32_t)(value * 1024 + 0.5); 255 } 256 257 static void edid_colorspace(uint8_t *edid, 258 float rx, float ry, 259 float gx, float gy, 260 float bx, float by, 261 float wx, float wy) 262 { 263 uint32_t red_x = edid_to_10bit(rx); 264 uint32_t red_y = edid_to_10bit(ry); 265 uint32_t green_x = edid_to_10bit(gx); 266 uint32_t green_y = edid_to_10bit(gy); 267 uint32_t blue_x = edid_to_10bit(bx); 268 uint32_t blue_y = edid_to_10bit(by); 269 uint32_t white_x = edid_to_10bit(wx); 270 uint32_t white_y = edid_to_10bit(wy); 271 272 edid[25] = (((red_x & 0x03) << 6) | 273 ((red_y & 0x03) << 4) | 274 ((green_x & 0x03) << 2) | 275 ((green_y & 0x03) << 0)); 276 edid[26] = (((blue_x & 0x03) << 6) | 277 ((blue_y & 0x03) << 4) | 278 ((white_x & 0x03) << 2) | 279 ((white_y & 0x03) << 0)); 280 edid[27] = red_x >> 2; 281 edid[28] = red_y >> 2; 282 edid[29] = green_x >> 2; 283 edid[30] = green_y >> 2; 284 edid[31] = blue_x >> 2; 285 edid[32] = blue_y >> 2; 286 edid[33] = white_x >> 2; 287 edid[34] = white_y >> 2; 288 } 289 290 static uint32_t qemu_edid_dpi_from_mm(uint32_t mm, uint32_t res) 291 { 292 return res * 254 / 10 / mm; 293 } 294 295 uint32_t qemu_edid_dpi_to_mm(uint32_t dpi, uint32_t res) 296 { 297 return res * 254 / 10 / dpi; 298 } 299 300 void qemu_edid_generate(uint8_t *edid, size_t size, 301 qemu_edid_info *info) 302 { 303 uint32_t desc = 54; 304 uint8_t *xtra3 = NULL; 305 uint8_t *dta = NULL; 306 uint32_t width_mm, height_mm; 307 uint32_t dpi = 100; /* if no width_mm/height_mm */ 308 309 /* =============== set defaults =============== */ 310 311 if (!info->vendor || strlen(info->vendor) != 3) { 312 info->vendor = "RHT"; 313 } 314 if (!info->name) { 315 info->name = "QEMU Monitor"; 316 } 317 if (!info->prefx) { 318 info->prefx = 1024; 319 } 320 if (!info->prefy) { 321 info->prefy = 768; 322 } 323 if (info->width_mm && info->height_mm) { 324 width_mm = info->width_mm; 325 height_mm = info->height_mm; 326 dpi = qemu_edid_dpi_from_mm(width_mm, info->prefx); 327 } else { 328 width_mm = qemu_edid_dpi_to_mm(dpi, info->prefx); 329 height_mm = qemu_edid_dpi_to_mm(dpi, info->prefy); 330 } 331 332 /* =============== extensions =============== */ 333 334 if (size >= 256) { 335 dta = edid + 128; 336 edid[126]++; 337 edid_ext_dta(dta); 338 } 339 340 /* =============== header information =============== */ 341 342 /* fixed */ 343 edid[0] = 0x00; 344 edid[1] = 0xff; 345 edid[2] = 0xff; 346 edid[3] = 0xff; 347 edid[4] = 0xff; 348 edid[5] = 0xff; 349 edid[6] = 0xff; 350 edid[7] = 0x00; 351 352 /* manufacturer id, product code, serial number */ 353 uint16_t vendor_id = ((((info->vendor[0] - '@') & 0x1f) << 10) | 354 (((info->vendor[1] - '@') & 0x1f) << 5) | 355 (((info->vendor[2] - '@') & 0x1f) << 0)); 356 uint16_t model_nr = 0x1234; 357 uint32_t serial_nr = info->serial ? atoi(info->serial) : 0; 358 stw_be_p(edid + 8, vendor_id); 359 stw_le_p(edid + 10, model_nr); 360 stl_le_p(edid + 12, serial_nr); 361 362 /* manufacture week and year */ 363 edid[16] = 42; 364 edid[17] = 2014 - 1990; 365 366 /* edid version */ 367 edid[18] = 1; 368 edid[19] = 4; 369 370 371 /* =============== basic display parameters =============== */ 372 373 /* video input: digital, 8bpc, displayport */ 374 edid[20] = 0xa5; 375 376 /* screen size: undefined */ 377 edid[21] = width_mm / 10; 378 edid[22] = height_mm / 10; 379 380 /* display gamma: 2.2 */ 381 edid[23] = 220 - 100; 382 383 /* supported features bitmap: std sRGB, preferred timing */ 384 edid[24] = 0x06; 385 386 387 /* =============== chromaticity coordinates =============== */ 388 389 /* standard sRGB colorspace */ 390 edid_colorspace(edid, 391 0.6400, 0.3300, /* red */ 392 0.3000, 0.6000, /* green */ 393 0.1500, 0.0600, /* blue */ 394 0.3127, 0.3290); /* white point */ 395 396 /* =============== established timing bitmap =============== */ 397 /* =============== standard timing information =============== */ 398 399 /* both filled by edid_fill_modes() */ 400 401 402 /* =============== descriptor blocks =============== */ 403 404 edid_desc_timing(edid + desc, info->prefx, info->prefy, 405 width_mm, height_mm); 406 desc += 18; 407 408 edid_desc_ranges(edid + desc); 409 desc += 18; 410 411 if (info->name) { 412 edid_desc_text(edid + desc, 0xfc, info->name); 413 desc += 18; 414 } 415 416 if (info->serial) { 417 edid_desc_text(edid + desc, 0xff, info->serial); 418 desc += 18; 419 } 420 421 if (desc < 126) { 422 xtra3 = edid + desc; 423 edid_desc_xtra3_std(xtra3); 424 desc += 18; 425 } 426 427 while (desc < 126) { 428 edid_desc_dummy(edid + desc); 429 desc += 18; 430 } 431 432 /* =============== finish up =============== */ 433 434 edid_fill_modes(edid, xtra3, dta, info->maxx, info->maxy); 435 edid_checksum(edid); 436 if (dta) { 437 edid_checksum(dta); 438 } 439 } 440 441 size_t qemu_edid_size(uint8_t *edid) 442 { 443 uint32_t exts; 444 445 if (edid[0] != 0x00 || 446 edid[1] != 0xff) { 447 /* doesn't look like a valid edid block */ 448 return 0; 449 } 450 451 exts = edid[126]; 452 return 128 * (exts + 1); 453 } 454