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