627c865d22
Simplify the code that doesn't need strncpy() since length of string
is already computed.
/home/elmarco/src/qemu/hw/display/edid-generate.c: In function 'edid_desc_text':
/home/elmarco/src/qemu/hw/display/edid-generate.c:168:5: error: 'strncpy' specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
strncpy((char *)(desc + 5), text, len);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/elmarco/src/qemu/hw/display/edid-generate.c:164:11: note: length computed here
len = strlen(text);
^~~~~~~~~~~~
cc1: all warnings being treated as errors
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-id: 20181110111623.31356-1-marcandre.lureau@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
440 lines
11 KiB
C
440 lines
11 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-common.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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/* additional standard timings 3 (all @ 60Hz) */
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{ .xres = 1920, .yres = 1440, .xtra3 = 11, .bit = 5 },
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{ .xres = 1920, .yres = 1200, .xtra3 = 10, .bit = 0 },
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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 = 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 = 1050, .xtra3 = 8, .bit = 1 },
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{ .xres = 1440, .yres = 900, .xtra3 = 8, .bit = 5 },
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{ .xres = 1360, .yres = 768, .xtra3 = 8, .bit = 7 },
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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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/* 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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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 (mode->xtra3 && xtra3) {
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xtra3[mode->xtra3] |= (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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}
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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)
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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 < 127; 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[127] = 0x100 - sum;
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}
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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 (1200 MHz) */
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desc[9] = 1200 / 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,
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uint32_t xres, uint32_t yres,
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uint32_t dpi)
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{
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/* physical display size */
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uint32_t xmm = xres * dpi / 254;
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uint32_t ymm = yres * dpi / 254;
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/* pull some realistic looking timings out of thin air */
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uint32_t xfront = xres * 25 / 100;
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uint32_t xsync = xres * 3 / 100;
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uint32_t xblank = xres * 35 / 100;
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uint32_t yfront = yres * 5 / 1000;
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uint32_t ysync = yres * 5 / 1000;
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uint32_t yblank = yres * 35 / 1000;
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uint32_t clock = 75 * (xres + xblank) * (yres + yblank);
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stl_le_p(desc, clock / 10000);
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desc[2] = xres & 0xff;
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desc[3] = xblank & 0xff;
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desc[4] = (((xres & 0xf00) >> 4) |
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((xblank & 0xf00) >> 8));
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desc[5] = yres & 0xff;
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desc[6] = yblank & 0xff;
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desc[7] = (((yres & 0xf00) >> 4) |
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((yblank & 0xf00) >> 8));
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desc[8] = xfront & 0xff;
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desc[9] = xsync & 0xff;
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desc[10] = (((yfront & 0x00f) << 4) |
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((ysync & 0x00f) << 0));
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desc[11] = (((xfront & 0x300) >> 2) |
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((xsync & 0x300) >> 4) |
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((yfront & 0x030) >> 2) |
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((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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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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uint32_t desc = 54;
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uint8_t *xtra3 = NULL;
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uint8_t *dta = NULL;
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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->dpi) {
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info->dpi = 100;
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}
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if (!info->prefx) {
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info->prefx = 1024;
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}
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if (!info->prefy) {
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info->prefy = 768;
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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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/* =============== 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] = info->prefx * info->dpi / 2540;
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edid[22] = info->prefy * info->dpi / 2540;
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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,
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0.6400, 0.3300, /* red */
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0.3000, 0.6000, /* green */
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0.1500, 0.0600, /* blue */
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0.3127, 0.3290); /* white point */
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/* =============== established timing bitmap =============== */
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/* =============== standard timing information =============== */
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/* both filled by edid_fill_modes() */
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/* =============== descriptor blocks =============== */
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edid_desc_timing(edid + desc, info->prefx, info->prefy, info->dpi);
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desc += 18;
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edid_desc_ranges(edid + desc);
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desc += 18;
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if (info->name) {
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edid_desc_text(edid + desc, 0xfc, info->name);
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desc += 18;
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}
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if (info->serial) {
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edid_desc_text(edid + desc, 0xff, info->serial);
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desc += 18;
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}
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if (desc < 126) {
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xtra3 = edid + desc;
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edid_desc_xtra3_std(xtra3);
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desc += 18;
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}
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while (desc < 126) {
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edid_desc_dummy(edid + desc);
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desc += 18;
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}
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/* =============== finish up =============== */
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edid_fill_modes(edid, xtra3, dta, info->maxx, info->maxy);
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edid_checksum(edid);
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if (dta) {
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edid_checksum(dta);
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}
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}
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size_t qemu_edid_size(uint8_t *edid)
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{
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uint32_t exts;
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if (edid[0] != 0x00 ||
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edid[1] != 0xff) {
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/* doesn't look like a valid edid block */
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return 0;
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}
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exts = edid[126];
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return 128 * (exts + 1);
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}
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