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