| /* |
| * QEMU EDID generator. |
| * |
| * This work is licensed under the terms of the GNU GPL, version 2 or later. |
| * See the COPYING file in the top-level directory. |
| */ |
| #include "qemu/osdep.h" |
| #include "qemu/bswap.h" |
| #include "hw/display/edid.h" |
| |
| static const struct edid_mode { |
| uint32_t xres; |
| uint32_t yres; |
| uint32_t byte; |
| uint32_t xtra3; |
| uint32_t bit; |
| uint32_t dta; |
| } modes[] = { |
| /* dea/dta extension timings (all @ 50 Hz) */ |
| { .xres = 5120, .yres = 2160, .dta = 125 }, |
| { .xres = 4096, .yres = 2160, .dta = 101 }, |
| { .xres = 3840, .yres = 2160, .dta = 96 }, |
| { .xres = 2560, .yres = 1080, .dta = 89 }, |
| { .xres = 2048, .yres = 1152 }, |
| { .xres = 1920, .yres = 1080, .dta = 31 }, |
| |
| /* dea/dta extension timings (all @ 60 Hz) */ |
| { .xres = 3840, .yres = 2160, .dta = 97 }, |
| |
| /* additional standard timings 3 (all @ 60Hz) */ |
| { .xres = 1920, .yres = 1200, .xtra3 = 10, .bit = 0 }, |
| { .xres = 1600, .yres = 1200, .xtra3 = 9, .bit = 2 }, |
| { .xres = 1680, .yres = 1050, .xtra3 = 9, .bit = 5 }, |
| { .xres = 1440, .yres = 900, .xtra3 = 8, .bit = 5 }, |
| { .xres = 1280, .yres = 1024, .xtra3 = 7, .bit = 1 }, |
| { .xres = 1280, .yres = 960, .xtra3 = 7, .bit = 3 }, |
| { .xres = 1280, .yres = 768, .xtra3 = 7, .bit = 6 }, |
| |
| { .xres = 1920, .yres = 1440, .xtra3 = 11, .bit = 5 }, |
| { .xres = 1856, .yres = 1392, .xtra3 = 10, .bit = 3 }, |
| { .xres = 1792, .yres = 1344, .xtra3 = 10, .bit = 5 }, |
| { .xres = 1440, .yres = 1050, .xtra3 = 8, .bit = 1 }, |
| { .xres = 1360, .yres = 768, .xtra3 = 8, .bit = 7 }, |
| |
| /* established timings (all @ 60Hz) */ |
| { .xres = 1024, .yres = 768, .byte = 36, .bit = 3 }, |
| { .xres = 800, .yres = 600, .byte = 35, .bit = 0 }, |
| { .xres = 640, .yres = 480, .byte = 35, .bit = 5 }, |
| }; |
| |
| typedef struct Timings { |
| uint32_t xfront; |
| uint32_t xsync; |
| uint32_t xblank; |
| |
| uint32_t yfront; |
| uint32_t ysync; |
| uint32_t yblank; |
| |
| uint64_t clock; |
| } Timings; |
| |
| static void generate_timings(Timings *timings, uint32_t refresh_rate, |
| uint32_t xres, uint32_t yres) |
| { |
| /* pull some realistic looking timings out of thin air */ |
| timings->xfront = xres * 25 / 100; |
| timings->xsync = xres * 3 / 100; |
| timings->xblank = xres * 35 / 100; |
| |
| timings->yfront = yres * 5 / 1000; |
| timings->ysync = yres * 5 / 1000; |
| timings->yblank = yres * 35 / 1000; |
| |
| timings->clock = ((uint64_t)refresh_rate * |
| (xres + timings->xblank) * |
| (yres + timings->yblank)) / 10000000; |
| } |
| |
| static void edid_ext_dta(uint8_t *dta) |
| { |
| dta[0] = 0x02; |
| dta[1] = 0x03; |
| dta[2] = 0x05; |
| dta[3] = 0x00; |
| |
| /* video data block */ |
| dta[4] = 0x40; |
| } |
| |
| static void edid_ext_dta_mode(uint8_t *dta, uint8_t nr) |
| { |
| dta[dta[2]] = nr; |
| dta[2]++; |
| dta[4]++; |
| } |
| |
| static int edid_std_mode(uint8_t *mode, uint32_t xres, uint32_t yres) |
| { |
| uint32_t aspect; |
| |
| if (xres == 0 || yres == 0) { |
| mode[0] = 0x01; |
| mode[1] = 0x01; |
| return 0; |
| |
| } else if (xres * 10 == yres * 16) { |
| aspect = 0; |
| } else if (xres * 3 == yres * 4) { |
| aspect = 1; |
| } else if (xres * 4 == yres * 5) { |
| aspect = 2; |
| } else if (xres * 9 == yres * 16) { |
| aspect = 3; |
| } else { |
| return -1; |
| } |
| |
| if ((xres / 8) - 31 > 255) { |
| return -1; |
| } |
| |
| mode[0] = (xres / 8) - 31; |
| mode[1] = ((aspect << 6) | (60 - 60)); |
| return 0; |
| } |
| |
| static void edid_fill_modes(uint8_t *edid, uint8_t *xtra3, uint8_t *dta, |
| uint32_t maxx, uint32_t maxy) |
| { |
| const struct edid_mode *mode; |
| int std = 38; |
| int rc, i; |
| |
| for (i = 0; i < ARRAY_SIZE(modes); i++) { |
| mode = modes + i; |
| |
| if ((maxx && mode->xres > maxx) || |
| (maxy && mode->yres > maxy)) { |
| continue; |
| } |
| |
| if (mode->byte) { |
| edid[mode->byte] |= (1 << mode->bit); |
| } else if (std < 54) { |
| rc = edid_std_mode(edid + std, mode->xres, mode->yres); |
| if (rc == 0) { |
| std += 2; |
| } |
| } else if (mode->xtra3 && xtra3) { |
| xtra3[mode->xtra3] |= (1 << mode->bit); |
| } |
| |
| if (dta && mode->dta) { |
| edid_ext_dta_mode(dta, mode->dta); |
| } |
| } |
| |
| while (std < 54) { |
| edid_std_mode(edid + std, 0, 0); |
| std += 2; |
| } |
| } |
| |
| static void edid_checksum(uint8_t *edid, size_t len) |
| { |
| uint32_t sum = 0; |
| int i; |
| |
| for (i = 0; i < len; i++) { |
| sum += edid[i]; |
| } |
| sum &= 0xff; |
| if (sum) { |
| edid[len] = 0x100 - sum; |
| } |
| } |
| |
| static uint8_t *edid_desc_next(uint8_t *edid, uint8_t *dta, uint8_t *desc) |
| { |
| if (desc == NULL) { |
| return NULL; |
| } |
| if (desc + 18 + 18 < edid + 127) { |
| return desc + 18; |
| } |
| if (dta) { |
| if (desc < edid + 127) { |
| return dta + dta[2]; |
| } |
| if (desc + 18 + 18 < dta + 127) { |
| return desc + 18; |
| } |
| } |
| return NULL; |
| } |
| |
| static void edid_desc_type(uint8_t *desc, uint8_t type) |
| { |
| desc[0] = 0; |
| desc[1] = 0; |
| desc[2] = 0; |
| desc[3] = type; |
| desc[4] = 0; |
| } |
| |
| static void edid_desc_text(uint8_t *desc, uint8_t type, |
| const char *text) |
| { |
| size_t len; |
| |
| edid_desc_type(desc, type); |
| memset(desc + 5, ' ', 13); |
| |
| len = strlen(text); |
| if (len > 12) { |
| len = 12; |
| } |
| memcpy(desc + 5, text, len); |
| desc[5 + len] = '\n'; |
| } |
| |
| static void edid_desc_ranges(uint8_t *desc) |
| { |
| edid_desc_type(desc, 0xfd); |
| |
| /* vertical (50 -> 125 Hz) */ |
| desc[5] = 50; |
| desc[6] = 125; |
| |
| /* horizontal (30 -> 160 kHz) */ |
| desc[7] = 30; |
| desc[8] = 160; |
| |
| /* max dot clock (2550 MHz) */ |
| desc[9] = 2550 / 10; |
| |
| /* no extended timing information */ |
| desc[10] = 0x01; |
| |
| /* padding */ |
| desc[11] = '\n'; |
| memset(desc + 12, ' ', 6); |
| } |
| |
| /* additional standard timings 3 */ |
| static void edid_desc_xtra3_std(uint8_t *desc) |
| { |
| edid_desc_type(desc, 0xf7); |
| desc[5] = 10; |
| } |
| |
| static void edid_desc_dummy(uint8_t *desc) |
| { |
| edid_desc_type(desc, 0x10); |
| } |
| |
| static void edid_desc_timing(uint8_t *desc, const Timings *timings, |
| uint32_t xres, uint32_t yres, |
| uint32_t xmm, uint32_t ymm) |
| { |
| stw_le_p(desc, timings->clock); |
| |
| desc[2] = xres & 0xff; |
| desc[3] = timings->xblank & 0xff; |
| desc[4] = (((xres & 0xf00) >> 4) | |
| ((timings->xblank & 0xf00) >> 8)); |
| |
| desc[5] = yres & 0xff; |
| desc[6] = timings->yblank & 0xff; |
| desc[7] = (((yres & 0xf00) >> 4) | |
| ((timings->yblank & 0xf00) >> 8)); |
| |
| desc[8] = timings->xfront & 0xff; |
| desc[9] = timings->xsync & 0xff; |
| |
| desc[10] = (((timings->yfront & 0x00f) << 4) | |
| ((timings->ysync & 0x00f) << 0)); |
| desc[11] = (((timings->xfront & 0x300) >> 2) | |
| ((timings->xsync & 0x300) >> 4) | |
| ((timings->yfront & 0x030) >> 2) | |
| ((timings->ysync & 0x030) >> 4)); |
| |
| desc[12] = xmm & 0xff; |
| desc[13] = ymm & 0xff; |
| desc[14] = (((xmm & 0xf00) >> 4) | |
| ((ymm & 0xf00) >> 8)); |
| |
| desc[17] = 0x18; |
| } |
| |
| static uint32_t edid_to_10bit(float value) |
| { |
| return (uint32_t)(value * 1024 + 0.5); |
| } |
| |
| static void edid_colorspace(uint8_t *edid, |
| float rx, float ry, |
| float gx, float gy, |
| float bx, float by, |
| float wx, float wy) |
| { |
| uint32_t red_x = edid_to_10bit(rx); |
| uint32_t red_y = edid_to_10bit(ry); |
| uint32_t green_x = edid_to_10bit(gx); |
| uint32_t green_y = edid_to_10bit(gy); |
| uint32_t blue_x = edid_to_10bit(bx); |
| uint32_t blue_y = edid_to_10bit(by); |
| uint32_t white_x = edid_to_10bit(wx); |
| uint32_t white_y = edid_to_10bit(wy); |
| |
| edid[25] = (((red_x & 0x03) << 6) | |
| ((red_y & 0x03) << 4) | |
| ((green_x & 0x03) << 2) | |
| ((green_y & 0x03) << 0)); |
| edid[26] = (((blue_x & 0x03) << 6) | |
| ((blue_y & 0x03) << 4) | |
| ((white_x & 0x03) << 2) | |
| ((white_y & 0x03) << 0)); |
| edid[27] = red_x >> 2; |
| edid[28] = red_y >> 2; |
| edid[29] = green_x >> 2; |
| edid[30] = green_y >> 2; |
| edid[31] = blue_x >> 2; |
| edid[32] = blue_y >> 2; |
| edid[33] = white_x >> 2; |
| edid[34] = white_y >> 2; |
| } |
| |
| static uint32_t qemu_edid_dpi_from_mm(uint32_t mm, uint32_t res) |
| { |
| return res * 254 / 10 / mm; |
| } |
| |
| uint32_t qemu_edid_dpi_to_mm(uint32_t dpi, uint32_t res) |
| { |
| return res * 254 / 10 / dpi; |
| } |
| |
| static void init_displayid(uint8_t *did) |
| { |
| did[0] = 0x70; /* display id extension */ |
| did[1] = 0x13; /* version 1.3 */ |
| did[2] = 4; /* length */ |
| did[3] = 0x03; /* product type (0x03 == standalone display device) */ |
| edid_checksum(did + 1, did[2] + 4); |
| } |
| |
| static void qemu_displayid_generate(uint8_t *did, const Timings *timings, |
| uint32_t xres, uint32_t yres, |
| uint32_t xmm, uint32_t ymm) |
| { |
| did[0] = 0x70; /* display id extension */ |
| did[1] = 0x13; /* version 1.3 */ |
| did[2] = 23; /* length */ |
| did[3] = 0x03; /* product type (0x03 == standalone display device) */ |
| |
| did[5] = 0x03; /* Detailed Timings Data Block */ |
| did[6] = 0x00; /* revision */ |
| did[7] = 0x14; /* block length */ |
| |
| did[8] = timings->clock & 0xff; |
| did[9] = (timings->clock & 0xff00) >> 8; |
| did[10] = (timings->clock & 0xff0000) >> 16; |
| |
| did[11] = 0x88; /* leave aspect ratio undefined */ |
| |
| stw_le_p(did + 12, 0xffff & (xres - 1)); |
| stw_le_p(did + 14, 0xffff & (timings->xblank - 1)); |
| stw_le_p(did + 16, 0xffff & (timings->xfront - 1)); |
| stw_le_p(did + 18, 0xffff & (timings->xsync - 1)); |
| |
| stw_le_p(did + 20, 0xffff & (yres - 1)); |
| stw_le_p(did + 22, 0xffff & (timings->yblank - 1)); |
| stw_le_p(did + 24, 0xffff & (timings->yfront - 1)); |
| stw_le_p(did + 26, 0xffff & (timings->ysync - 1)); |
| |
| edid_checksum(did + 1, did[2] + 4); |
| } |
| |
| void qemu_edid_generate(uint8_t *edid, size_t size, |
| qemu_edid_info *info) |
| { |
| Timings timings; |
| uint8_t *desc = edid + 54; |
| uint8_t *xtra3 = NULL; |
| uint8_t *dta = NULL; |
| uint8_t *did = NULL; |
| uint32_t width_mm, height_mm; |
| uint32_t refresh_rate = info->refresh_rate ? info->refresh_rate : 75000; |
| uint32_t dpi = 100; /* if no width_mm/height_mm */ |
| uint32_t large_screen = 0; |
| |
| /* =============== set defaults =============== */ |
| |
| if (!info->vendor || strlen(info->vendor) != 3) { |
| info->vendor = "RHT"; |
| } |
| if (!info->name) { |
| info->name = "QEMU Monitor"; |
| } |
| if (!info->prefx) { |
| info->prefx = 1280; |
| } |
| if (!info->prefy) { |
| info->prefy = 800; |
| } |
| if (info->width_mm && info->height_mm) { |
| width_mm = info->width_mm; |
| height_mm = info->height_mm; |
| dpi = qemu_edid_dpi_from_mm(width_mm, info->prefx); |
| } else { |
| width_mm = qemu_edid_dpi_to_mm(dpi, info->prefx); |
| height_mm = qemu_edid_dpi_to_mm(dpi, info->prefy); |
| } |
| |
| generate_timings(&timings, refresh_rate, info->prefx, info->prefy); |
| if (info->prefx >= 4096 || info->prefy >= 4096 || timings.clock >= 65536) { |
| large_screen = 1; |
| } |
| |
| /* =============== extensions =============== */ |
| |
| if (size >= 256) { |
| dta = edid + 128; |
| edid[126]++; |
| edid_ext_dta(dta); |
| } |
| |
| if (size >= 384 && large_screen) { |
| did = edid + 256; |
| edid[126]++; |
| init_displayid(did); |
| } |
| |
| /* =============== header information =============== */ |
| |
| /* fixed */ |
| edid[0] = 0x00; |
| edid[1] = 0xff; |
| edid[2] = 0xff; |
| edid[3] = 0xff; |
| edid[4] = 0xff; |
| edid[5] = 0xff; |
| edid[6] = 0xff; |
| edid[7] = 0x00; |
| |
| /* manufacturer id, product code, serial number */ |
| uint16_t vendor_id = ((((info->vendor[0] - '@') & 0x1f) << 10) | |
| (((info->vendor[1] - '@') & 0x1f) << 5) | |
| (((info->vendor[2] - '@') & 0x1f) << 0)); |
| uint16_t model_nr = 0x1234; |
| uint32_t serial_nr = info->serial ? atoi(info->serial) : 0; |
| stw_be_p(edid + 8, vendor_id); |
| stw_le_p(edid + 10, model_nr); |
| stl_le_p(edid + 12, serial_nr); |
| |
| /* manufacture week and year */ |
| edid[16] = 42; |
| edid[17] = 2014 - 1990; |
| |
| /* edid version */ |
| edid[18] = 1; |
| edid[19] = 4; |
| |
| |
| /* =============== basic display parameters =============== */ |
| |
| /* video input: digital, 8bpc, displayport */ |
| edid[20] = 0xa5; |
| |
| /* screen size: undefined */ |
| edid[21] = width_mm / 10; |
| edid[22] = height_mm / 10; |
| |
| /* display gamma: 2.2 */ |
| edid[23] = 220 - 100; |
| |
| /* supported features bitmap: std sRGB, preferred timing */ |
| edid[24] = 0x06; |
| |
| |
| /* =============== chromaticity coordinates =============== */ |
| |
| /* standard sRGB colorspace */ |
| edid_colorspace(edid, |
| 0.6400, 0.3300, /* red */ |
| 0.3000, 0.6000, /* green */ |
| 0.1500, 0.0600, /* blue */ |
| 0.3127, 0.3290); /* white point */ |
| |
| /* =============== established timing bitmap =============== */ |
| /* =============== standard timing information =============== */ |
| |
| /* both filled by edid_fill_modes() */ |
| |
| |
| /* =============== descriptor blocks =============== */ |
| |
| if (!large_screen) { |
| /* The DTD section has only 12 bits to store the resolution */ |
| edid_desc_timing(desc, &timings, info->prefx, info->prefy, |
| width_mm, height_mm); |
| desc = edid_desc_next(edid, dta, desc); |
| } |
| |
| xtra3 = desc; |
| edid_desc_xtra3_std(xtra3); |
| desc = edid_desc_next(edid, dta, desc); |
| edid_fill_modes(edid, xtra3, dta, info->maxx, info->maxy); |
| /* |
| * dta video data block is finished at thus point, |
| * so dta descriptor offsets don't move any more. |
| */ |
| |
| edid_desc_ranges(desc); |
| desc = edid_desc_next(edid, dta, desc); |
| |
| if (desc && info->name) { |
| edid_desc_text(desc, 0xfc, info->name); |
| desc = edid_desc_next(edid, dta, desc); |
| } |
| |
| if (desc && info->serial) { |
| edid_desc_text(desc, 0xff, info->serial); |
| desc = edid_desc_next(edid, dta, desc); |
| } |
| |
| while (desc) { |
| edid_desc_dummy(desc); |
| desc = edid_desc_next(edid, dta, desc); |
| } |
| |
| /* =============== display id extensions =============== */ |
| |
| if (did && large_screen) { |
| qemu_displayid_generate(did, &timings, info->prefx, info->prefy, |
| width_mm, height_mm); |
| } |
| |
| /* =============== finish up =============== */ |
| |
| edid_checksum(edid, 127); |
| if (dta) { |
| edid_checksum(dta, 127); |
| } |
| if (did) { |
| edid_checksum(did, 127); |
| } |
| } |
| |
| size_t qemu_edid_size(uint8_t *edid) |
| { |
| uint32_t exts; |
| |
| if (edid[0] != 0x00 || |
| edid[1] != 0xff) { |
| /* doesn't look like a valid edid block */ |
| return 0; |
| } |
| |
| exts = edid[126]; |
| return 128 * (exts + 1); |
| } |
