meson: convert hw/vfio
[qemu.git] / hw / display / edid-generate.c
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 }