{"id":124015,"date":"2025-05-04T09:05:07","date_gmt":"2025-05-04T07:05:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/razrabotchiki-yadra-linux-na-puti-k-udaleniyu-podderzhki-proczessorov-i486"},"modified":"2025-05-04T09:05:07","modified_gmt":"2025-05-04T07:05:07","slug":"razrabotchiki-yadra-linux-na-puti-k-udaleniyu-podderzhki-proczessorov-i486","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/razrabotchiki-yadra-linux-na-puti-k-udaleniyu-podderzhki-proczessorov-i486","title":{"rendered":"V\u00fdvoj\u00e1ri jadra Linux s\u00fa na ceste k odstr\u00e1neniu podpory procesorov i486","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ingo Molnar, udr\u017eiavate\u013e architekt\u00fary x86, mechanizmu zamykania a pl\u00e1nova\u010da \u00faloh v jadre Linux, predlo\u017eil na diskusiu s\u00fabor patchov, ktor\u00e9 odstra\u0148uj\u00fa z jadra podporu pre procesory 486 (M486, M486SX, AMD ELAN) a po\u010diato\u010dn\u00e9 s\u00e9rie procesorov 586. V jadre sa navrhuje ponecha\u0165 iba mo\u017enos\u0165 pr\u00e1ce s procesormi x86, ktor\u00e9 podporuj\u00fa in\u0161trukciu CX8 (CMPXCHG8B) a register TSC (Time Stamp Counter), ktor\u00e9 sa objavili v procesoroch Pentium. <\/p>\n

Upozor\u0148uje sa, \u017ee na podporu CPU 486 v jadre je potrebn\u00e9 udr\u017eiava\u0165 k\u00f3d, ktor\u00fd emuluje oper\u00e1cie CX8 (porovnaj a vymeni 8 bajtov) a TSC (po\u010d\u00edta\u010d cyklov CPU, pou\u017e\u00edvan\u00fd v pl\u00e1nova\u010di \u00faloh). Tak\u00fdto k\u00f3d komplikuje jadro, s\u0165a\u017euje \u00fadr\u017ebu a niekedy sa st\u00e1va zdrojom probl\u00e9mov, ktor\u00fdch anal\u00fdza zaber\u00e1 \u010das v\u00fdvoj\u00e1rom. Ukon\u010denie podpory 486 umo\u017en\u00ed odstr\u00e1ni\u0165 z jadra 14 104 riadkov k\u00f3du, \u010do v\u00fdrazne zjednodu\u0161\u00ed niektor\u00e9 funkcie v jadre t\u00fdm, \u017ee sa odstr\u00e1nia vrstvy emuluj\u00face CX8 a TSC, a umo\u017en\u00ed zbavi\u0165 sa kni\u017enice math-emu, emuluj\u00facej FPU. <\/p>\n

De\u0148 pred zverejnen\u00edm patchov inicia\u010dn\u00fd probl\u00e9m odstr\u00e1nenia podpory 486 vznesol Linus Torvalds v diskusii o \u010fal\u0161ej ot\u00e1zke, ktor\u00e1 sa objavila pri emul\u00e1cii CX8. Linus ver\u00ed, \u017ee nastal \u010das vzda\u0165 sa podpory CPU 486 a nevid\u00ed d\u00f4vody, pre\u010do \u010falej m\u00ed\u0148a\u0165 \u010das v\u00fdvoj\u00e1rov na rie\u0161enie probl\u00e9mov, ktor\u00e9 z nich vypl\u00fdvaj\u00fa. Podpora procesorov 386 bola z jadra odstr\u00e1nen\u00e1 v roku 2012. Pod\u013ea n\u00e1zorov \u00fa\u010dastn\u00edkov diskusie nastal teraz \u010das na odstr\u00e1nenie podpory CPU 486. V okt\u00f3bri 2022 Linus u\u017e publikoval podobn\u00fd n\u00e1vrh, ale ten sa nerozvinul. <\/p>\n

Vo zvy\u0161koch syst\u00e9mu 486 sa aktu\u00e1lne jadra Linux prakticky nepou\u017e\u00edvaj\u00fa. \u0160pecializovan\u00e9 verzie procesorov 486 pre zabudovan\u00e9 syst\u00e9my, ako je Intel Quark, podporuj\u00fa CX8 a TSC, ich zmeny sa nedotkn\u00fa. Star\u00e9 origin\u00e1lne CPU 486 sa zvy\u010dajne na\u010falej pou\u017e\u00edvaj\u00fa so zastaran\u00fdmi distrib\u00faciami, ktor\u00e9 dod\u00e1vaj\u00fa star\u00e9 verzie jadra Linux. Modern\u00e9 distrib\u00facie Linuxu d\u00e1vno prestali podporova\u0165 32-bitov\u00e9 syst\u00e9my x86 alebo pre\u0161li na pou\u017eitie mo\u017enosti X86_PAE pri zostavovan\u00ed, \u010do vy\u017eaduje podporu CX8.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0433\u043e \u041c\u043e\u043b\u043d\u0430\u0440 (Ingo Molnar), \u043c\u044d\u0439\u043d\u0442\u0435\u0439\u043d\u0435\u0440 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u044b x86, \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c\u0430 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a \u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0437\u0430\u0434\u0430\u0447 \u0432 \u044f\u0434\u0440\u0435 Linux, \u0432\u044b\u0441\u0442\u0430\u0432\u0438\u043b \u043d\u0430 \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u0435 \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439, \u0443\u0434\u0430\u043b\u044f\u044e\u0449\u0438\u0445 \u0438\u0437 \u044f\u0434\u0440\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0443 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 486 (M486, M486SX, AMD ELAN) \u0438 \u043d\u0430\u0447\u0430\u043b\u044c\u043d\u044b\u0445 \u0441\u0435\u0440\u0438\u0439 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043e\u0432 586. \u0412 \u044f\u0434\u0440\u0435 \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f \u043e\u0441\u0442\u0430\u0432\u0438\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u043c\u0438 x86, \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u044e\u0449\u0438\u043c\u0438 \u0438\u043d\u0441\u0442\u0440\u0443\u043a\u0446\u0438\u044e CX8 (CMPXCHG8B) \u0438 \u0440\u0435\u0433\u0438\u0441\u0442\u0440 TSC (Time Stamp Counter), […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-124015","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47V\u00fdvoj\u00e1ri jadra Linux s\u00fa na ceste k odstr\u00e1neniu podpory pre procesory i486 | ProHoster","description":"Ingo Molnar, maintainer architekt\u00fary x86, mechanizmu uzamknutia a pl\u00e1nova\u010da \u00faloh v jadre Linux, predlo\u017eil na diskusiu s\u00fabor patchov na odstr\u00e1nenie podpory pre procesory 486 (M486, M486SX, AMD ELAN) z 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