{"id":181694,"date":"2026-05-24T00:25:20","date_gmt":"2026-05-23T22:25:21","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386"},"modified":"2026-05-24T00:25:20","modified_gmt":"2026-05-23T22:25:21","slug":"vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","title":{"rendered":"Zavr\u0161ena je disasembly mikrokoda i386 i stvoren je otvoreni CPU z386","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Entuzijasti su uspje\u0161no izvukli i disasembliirali mikroprogram procesora Intel 80386, koji je zbog nedostatka dokumentacije bio smatran «crnom kutijom». Binarna slika mikroprograma je rekonstruirana uz pomo\u0107 AI-a na temelju fotografija visoke razlu\u010divosti kristala, a logika rada je analizirana putem pra\u0107enja veza na kristalu. Postupno su odre\u0111ene struktura mikrokomandi (μ-ops), polja, redoslijed izvr\u0161avanja i oznake kraja instrukcija. Postignu\u0107a projekta objavljena su na GitHubu kao javno dobro.<\/p>\n

\"Zavr\u0161ena<\/center><\/p>\n

Otkriveno je da u CPU 80386 svaka instrukcija u potpunosti izvr\u0161ava putem mikrokoda, dok se u 8086 i modernim procesorima dio instrukcija obra\u0111uje izravno. Osim toga, za razliku od procesora 8086, u 80386 mikrokod ne implementira algoritme izravno, ve\u0107 uglavnom konfigurira hardverske akceleratore (mno\u017ea\u010d, dijelnik, brzi pomak, PTU (Protection Test Unit)). <\/p>\n

Tijekom istra\u017eivanja tako\u0111er je otkriven mogu\u0107i problem s sigurno\u0161\u0107u pri obradi bitmapped prava pristupa ulazno\/izlaznim (IO permission bitmap): pri 4-bajtnoj obradi portova provjeravani su bitovi prava pristupa samo za prva 3 bajta, dok se pristup 4. bajtu nije provjeravao, \u0161to teoretski dopu\u0161ta pristup hardverskim registrima kojima bi pristup trebao biti zabranjen.<\/p>\n

Na temelju objavljenog mikrokoda razvijen je otvoreni CPU z386, implementiran na jeziku SystemVerilog i koji radi koriste\u0107i FPGA. Umjesto implementacije svake instrukcije u obliku posebnog RTL (Register-transfer level), u z386 su implementirane hardverske strukture kojima upravlja originalni mikrokod. Performanse pripremljene implementacije odgovaraju brzom 386 PC-u (~70MHz). Pod upravljanjem z386 uspje\u0161no su pokrenuti DOS 6\/7, DOS\/4GW, DOS\/32A i igre poput Doom i Cannon Fodder.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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i386 i stvoren otvoreni CPU z386 | ProHoster","description":"Entuzijasti su uspje\u0161no ekstraktirali i disasemblirali mikrokod Intel 80386 procesora, koji se zbog nedostatka dokumentacije smatrao \"crnom kutijom.\"","canonical_url":"https:\/\/prohoster.info\/hr\/blog\/news\/vypolneno-dizassemblirovaniya-mikrokoda-i386-i-sozdan-otkrytyj-cpu-z386","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"hr_HR","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u043e 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