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Revision as of 14:59, 23 June 2016 view source osdev>Basicfreak →‎EDID Data ← Older edit		Latest revision as of 05:21, 9 June 2024 view source Xtex (talk \| contribs) Interface administrators, Administrators 977 edits m Bot: Replace deprecated source tag with syntaxhighlight
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Line 2: == Reading EDID == The first step is, naturally, to actually get the data. This is done through the BIOS - ~~int~~INT 0x10, axAX=4F15h, blBL=01h, CX = Controller Unit, DX = EDID block, ES:DI = 128-Byte Buffer. <~~source~~syntaxhighlight lang="asm"> mov ax, 0x4f15 mov bl, 0x01 ~~mov~~xor cx, 0cx ~~mov~~xor dx, 0dx int 0x10 ;AL = 0x4F if function supported ;AH = status (0 is success, 1 is fail) ;ES:DI contains the EDID </syntaxhighlight> ~~</source>~~ Note that this code will only run in [[Real Mode]] or [[Virtual 8086 Mode]]. Line 288: \| Unused? \|} == Get preferred resolution == <syntaxhighlight lang="c"> void get_preferred_resolution(uint8_t edid, int x, int y) { x = edid[0x38] \| ((int) (edid[0x3A] & 0xF0) << 4); y = edid[0x3B] \| ((int) (edid[0x3D] & 0xF0) << 4); } </syntaxhighlight> == See Also == === External Links === [http://www.edidreader.com/ Online parser for EDID information] * [https://web.archive.org/web/20080614205229/http://www.vesa.org/public/VBE/VBEDDC11.PDF VBE/DDC 1.1 Specification] * [https://glenwing.github.io/docs/VESA-EEDID-A2.pdf VESA EDID 1.4 Specification] [[Category:Video]] [[Category:Hardware Detection]]