{"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\/cs\/blog\/news\/razrabotchiki-yadra-linux-na-puti-k-udaleniyu-podderzhki-proczessorov-i486","title":{"rendered":"V\u00fdvoj\u00e1\u0159i j\u00e1dra Linux se ub\u00edraj\u00ed k odstran\u011bn\u00ed podpory procesor\u016f i486","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ingo Molnar, spr\u00e1vce architektury x86, mechanismu zamyk\u00e1n\u00ed a pl\u00e1nova\u010de \u00faloh v j\u00e1d\u0159e Linux, p\u0159edlo\u017eil k diskusi sadu patch\u016f, kter\u00e9 odstra\u0148uj\u00ed z j\u00e1dra podporu procesor\u016f 486 (M486, M486SX, AMD ELAN) a po\u010d\u00e1te\u010dn\u00edch s\u00e9ri\u00ed procesor\u016f 586. V j\u00e1d\u0159e se navrhuje ponechat pouze mo\u017enost pr\u00e1ce s procesory x86, kter\u00e9 podporuj\u00ed instrukci CX8 (CMPXCHG8B) a registr TSC (Time Stamp Counter), kter\u00e9 se objevily v CPU Pentium. <\/p>\n

Upozor\u0148uje se, \u017ee pro podporu CPU 486 v j\u00e1d\u0159e je nutn\u00e9 udr\u017eovat k\u00f3d, kter\u00fd emuluje operace CX8 (srovnat a vym\u011bnit 8 bajt\u016f) a TSC (\u010d\u00edta\u010d cykl\u016f CPU, pou\u017e\u00edvan\u00fd v pl\u00e1nova\u010di \u00faloh). Takov\u00fd k\u00f3d komplikuje j\u00e1dro, zt\u011b\u017euje \u00fadr\u017ebu a n\u011bkdy se st\u00e1v\u00e1 zdrojem probl\u00e9m\u016f, jejich\u017e \u0159e\u0161en\u00ed zab\u00edr\u00e1 \u010das v\u00fdvoj\u00e1\u0159\u016fm. Ukon\u010den\u00ed podpory 486 umo\u017en\u00ed odstranit z j\u00e1dra 14 104 \u0159\u00e1dk\u016f k\u00f3du, co\u017e v\u00fdrazn\u011b zjednodu\u0161\u00ed n\u011bkter\u00e9 funkce j\u00e1dra t\u00edm, \u017ee se vylou\u010d\u00ed vrstvy, kter\u00e9 emuluj\u00ed CX8 a TSC, a umo\u017en\u00ed se zbavit knihovny math-emu, kter\u00e1 emuluje FPU. <\/p>\n

Den p\u0159ed zve\u0159ejn\u011bn\u00edm patch\u016f vznesl Linus Torvalds ot\u00e1zku o opr\u00e1vn\u011bnosti odstran\u011bn\u00ed podpory 486 p\u0159i diskusi o dal\u0161\u00edm probl\u00e9mu, kter\u00fd se objevuje p\u0159i emulaci CX8. Linus se domn\u00edv\u00e1, \u017ee nastal \u010das vzd\u00e1t se podpory CPU 486 a nevid\u00ed d\u016fvod, pro\u010d d\u00e1l pl\u00fdtvat \u010dasem v\u00fdvoj\u00e1\u0159\u016f na \u0159e\u0161en\u00ed probl\u00e9m\u016f, kter\u00e9 z toho vypl\u00fdvaj\u00ed. Podpora procesor\u016f 386 byla z j\u00e1dra odstran\u011bna v roce 2012. Podle \u00fa\u010dastn\u00edk\u016f diskuse nastal nyn\u00ed \u010das na odstran\u011bn\u00ed podpory CPU 486. V \u0159\u00edjnu 2022 Linus ji\u017e publikoval podobn\u00fd n\u00e1vrh, ale nedo\u0161lo k jeho dal\u0161\u00edmu rozvoji. <\/p>\n

V syst\u00e9mech 486, kter\u00e9 st\u00e1le existuj\u00ed, se aktu\u00e1ln\u00ed j\u00e1dra Linux t\u00e9m\u011b\u0159 nepou\u017e\u00edvaj\u00ed. Specializovan\u00e9 varianty procesor\u016f 486 pro vestav\u011bn\u00e9 syst\u00e9my, jako nap\u0159\u00edklad Intel Quark, podporuj\u00ed CX8 a TSC, a jich zm\u011bna se nedotkne. Star\u00e9 origin\u00e1ln\u00ed CPU 486 se v\u011bt\u0161inou nad\u00e1le pou\u017e\u00edvaj\u00ed se zastaral\u00fdmi distribucemi, kter\u00e9 dod\u00e1vaj\u00ed star\u00e9 verze j\u00e1dra Linux. Modern\u00ed distribuce Linuxu ji\u017e d\u00e1vno p\u0159estaly podporovat 32-bitov\u00e9 syst\u00e9my x86 nebo p\u0159e\u0161ly na pou\u017eit\u00ed volby X86_PAE, kter\u00e1 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\u00e1\u0159i j\u00e1dra Linux sm\u011b\u0159uj\u00ed k odstran\u011bn\u00ed podpory procesor\u016f i486 | ProHoster","description":"Ingo Molnar, spr\u00e1vce architektury x86, mechanismu z\u00e1mk\u016f a pl\u00e1nova\u010de \u00faloh v j\u00e1d\u0159e Linux, p\u0159edlo\u017eil k diskusi sadu patch\u016f, kter\u00e9 odstra\u0148uj\u00ed ze sou\u010d\u00e1sti j\u00e1dra podporu procesor\u016f 486 (M486, M486SX, 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