{"id":181741,"date":"2026-05-26T02:49:06","date_gmt":"2026-05-26T00:49:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/entuziasty-dizassemblirovali-mikrokod-i386-i-sozdali-otkrytyj-cpu-z386"},"modified":"2026-05-26T02:49:06","modified_gmt":"2026-05-26T00:49:06","slug":"entuziasty-dizassemblirovali-mikrokod-i386-i-sozdali-otkrytyj-cpu-z386","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/entuziasty-dizassemblirovali-mikrokod-i386-i-sozdali-otkrytyj-cpu-z386","title":{"rendered":"Enthousiastelingen hebben de microcode van de i386 gedissecteerd en een open CPU z386 gemaakt.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2026\/05\/495040ba8dffef375f674e59965a66da.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><noindex>      <noindex><\/p>\n<p>Enthousiasten <a rel=\"nofollow\" href=\"https:\/\/www.reenigne.org\/blog\/80386-microcode-disassembled\">is gelukt<\/a> met succesvol de microcode van de Intel 80386-processor te extraheren en te disassembleren, die vanwege het ontbreken van documentatie als een \"black box\" werd beschouwd. Het binaire beeld van de microcode werd gereconstrueerd met behulp van AI op basis van hoge resolutie foto's van de chip, en de werking werd geanalyseerd door middel van het traceren van de verbindingen op de chip. Geleidelijk werden de structuur van micro-opdrachten (\u03bc-ops), velden, uitvoeringsvolgorde en instructie-eindmarkeringen bepaald. Bijdragen van het project <a rel=\"nofollow\" href=\"https:\/\/github.com\/reenigne\/x86_microcode\/tree\/main\/80386\">gepubliceerd<\/a> zijn op GitHub als openbaar domein geplaatst.<\/p>\n<p><\/noindex><\/noindex><br \/>\n<noindex><\/p>\n<p>Het is vastgesteld dat in de CPU 80386 elke instructie volledig wordt uitgevoerd via microcode, terwijl in de 8086 en moderne processoren een deel van de instructies rechtstreeks wordt verwerkt. Bovendien implementeert de 80386 microcode, in tegenstelling tot de 8086-processoren, geen algoritmes rechtstreeks, maar configureert voornamelijk hardwareversnellers (vermenigvuldiger, deler, <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Barrel_shifter\">snelle verschuiving<\/a>, PTU (Protection Test Unit)).<\/p>\n<p><\/noindex><\/p>\n<p>Tijdens het onderzoek werd ook een mogelijke beveiligingskwestie ontdekt bij de verwerking van de toegangsmasker naar invoer\/uitvoer (IO permission bitmap): bij een 4-byte toegang tot poorten werd de toegang alleen gecontroleerd voor de eerste 3 bytes, terwijl de toegang tot de 4e byte niet werd gecontroleerd, wat theoretisch toegang tot hardwareregisters mogelijk maakte, waarvan de toegang verboden zou moeten zijn.<\/p>\n<p><noindex><\/p>\n<p>Op basis van de gepubliceerde microcode <a rel=\"nofollow\" href=\"https:\/\/nand2mario.github.io\/posts\/2026\/z386\">is ontworpen<\/a> de open CPU <a rel=\"nofollow\" href=\"https:\/\/github.com\/nand2mario\/z386\">z386<\/a>, ge\u00efmplementeerd in SystemVerilog en werkend met behulp van FPGA. In plaats van elke instructie als afzonderlijke <a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%A3%D1%80%D0%BE%D0%B2%D0%B5%D0%BD%D1%8C_%D1%80%D0%B5%D0%B3%D0%B8%D1%81%D1%82%D1%80%D0%BE%D0%B2%D1%8B%D1%85_%D0%BF%D0%B5%D1%80%D0%B5%D0%B4%D0%B0%D1%87\">RTL (wikipedia.org)<\/a> (register-transfer level) te implementeren, zijn er hardwarestructuren in de z386 ge\u00efmplementeerd die worden bestuurd door de originele microcode. De prestaties van de voorbereide implementatie komen overeen met die van een snelle 386 PC (~70MHz). Onder de z386 is het met succes gelukt om DOS 6\/7, DOS\/4GW, DOS\/32A en spellen zoals Doom en Cannon Fodder te draaien.<\/p>\n<p><\/noindex><\/p>\n<p>Bron: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/hardware\/18300992\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u042d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442\u044b \u0441\u043c\u043e\u0433\u043b\u0438 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0438\u0437\u0432\u043b\u0435\u0447\u044c \u0438 \u0434\u0438\u0437\u0430\u0441\u0441\u0435\u043c\u0431\u043b\u0438\u0440\u043e\u0432\u0430\u0442\u044c \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u0434 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430 Intel 80386, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438\u0437-\u0437\u0430 \u043e\u0442\u0441\u0443\u0442\u0441\u0442\u0432\u0438\u044f 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\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0439 \u043d\u0430 \u043a\u0440\u0438\u0441\u0442\u0430\u043b\u043b\u0435. \u041f\u043e\u0441\u0442\u0435\u043f\u0435\u043d\u043d\u043e \u0431\u044b\u043b\u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u044b \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0430 \u043c\u0438\u043a\u0440\u043e\u043a\u043e\u043c\u0430\u043d\u0434 (\u03bc-ops), \u043f\u043e\u043b\u044f, \u043f\u043e\u0440\u044f\u0434\u043e\u043a \u0438\u0441\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0438 \u043c\u0430\u0440\u043a\u0435\u0440\u044b \u043a\u043e\u043d\u0446\u0430 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u0439. \u041d\u0430\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-181741","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u042d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442\u044b\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Erik Peterson\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/nl\/blog\/news\/entuziasty-dizassemblirovali-mikrokod-i386-i-sozdali-otkrytyj-cpu-z386\" \/>\n\t\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.3\" \/>\n\t\t<meta property=\"og:locale\" content=\"nl_NL\" \/>\n\t\t<meta 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