{"id":6575,"date":"2024-06-06T11:03:24","date_gmt":"2024-06-06T11:03:24","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/direct-memory-access-dma\/"},"modified":"2024-06-06T11:03:24","modified_gmt":"2024-06-06T11:03:24","slug":"primy-pristup-do-pameti-dma","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/cs\/dictionary\/direct-memory-access-dma\/","title":{"rendered":"P\u0159\u00edm\u00fd p\u0159\u00edstup do pam\u011bti Dma"},"content":{"rendered":"<h1>P\u0159\u00edm\u00fd p\u0159\u00edstup do pam\u011bti (DMA)<\/h1>\n<p>P\u0159\u00edm\u00fd p\u0159\u00edstup do pam\u011bti (DMA) je hardwarov\u00e1 funkce po\u010d\u00edta\u010de, kter\u00e1 umo\u017e\u0148uje <a href=\"https:\/\/thecodest.co\/cs\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">data<\/a> p\u0159en\u00e1\u0161et mezi za\u0159\u00edzen\u00edmi a pam\u011bt\u00ed bez z\u00e1sahu procesoru. DMA umo\u017e\u0148uje za\u0159\u00edzen\u00edm, jako jsou zvukov\u00e9 karty, s\u00ed\u0165ov\u00e9 adapt\u00e9ry a pevn\u00e9 disky, p\u0159en\u00e1\u0161et data p\u0159\u00edmo do pam\u011bti a z pam\u011bti, \u010d\u00edm\u017e uvol\u0148uje procesor pro jin\u00e9 \u00falohy.<\/p>\n<p>Funkce DMA je u\u017eite\u010dn\u00e1 zejm\u00e9na p\u0159i p\u0159enosu velk\u00e9ho mno\u017estv\u00ed dat, proto\u017ee m\u016f\u017ee v\u00fdrazn\u011b sn\u00ed\u017eit re\u017eii procesoru pot\u0159ebnou pro p\u0159enos. To m\u016f\u017ee v\u00e9st ke zv\u00fd\u0161en\u00ed v\u00fdkonu syst\u00e9mu a sn\u00ed\u017een\u00ed latence.<\/p>\n<p>Existuj\u00ed dva typy DMA: DMA s nad\u0159azenou sb\u011brnic\u00ed a DMA t\u0159et\u00ed strany. Bus mastering DMA umo\u017e\u0148uje za\u0159\u00edzen\u00ed p\u0159evz\u00edt kontrolu nad syst\u00e9movou sb\u011brnic\u00ed a prov\u00e1d\u011bt p\u0159enosy p\u0159\u00edmo, zat\u00edmco DMA t\u0159et\u00ed strany zahrnuje vyhrazen\u00fd \u0159adi\u010d DMA, kter\u00fd spravuje p\u0159enosy jm\u00e9nem za\u0159\u00edzen\u00ed.<\/p>\n<p>DMA m\u016f\u017ee v\u00fdrazn\u011b zv\u00fd\u0161it v\u00fdkon syst\u00e9mu, ale m\u016f\u017ee tak\u00e9 p\u0159in\u00e9st bezpe\u010dnostn\u00ed rizika. \u0160kodliv\u00fd software m\u016f\u017ee potenci\u00e1ln\u011b zneu\u017e\u00edt DMA k p\u0159\u00edstupu k citliv\u00fdm dat\u016fm v pam\u011bti, co\u017e m\u016f\u017ee v\u00e9st k naru\u0161en\u00ed dat nebo jin\u00fdm bezpe\u010dnostn\u00edm incident\u016fm. Proto je d\u016fle\u017eit\u00e9 zav\u00e9st vhodn\u00e1 bezpe\u010dnostn\u00ed opat\u0159en\u00ed, jako je ochrana DMA, aby se tato rizika zm\u00edrnila.<\/p>\n<p>DMA je hardwarov\u00e1 funkce, kter\u00e1 umo\u017e\u0148uje za\u0159\u00edzen\u00edm p\u0159en\u00e1\u0161et data p\u0159\u00edmo do pam\u011bti a z pam\u011bti bez z\u00e1sahu procesoru. M\u016f\u017ee v\u00fdrazn\u011b zv\u00fd\u0161it v\u00fdkon syst\u00e9mu, ale tak\u00e9 p\u0159in\u00e1\u0161\u00ed bezpe\u010dnostn\u00ed rizika, kter\u00e1 je t\u0159eba \u0159e\u0161it.<\/p>","protected":false},"excerpt":{"rendered":"<p>P\u0159e\u010dt\u011bte si o p\u0159\u00edm\u00e9m p\u0159\u00edstupu do pam\u011bti (DMA) a o tom, jak m\u016f\u017ee zlep\u0161it v\u00fdkon syst\u00e9mu t\u00edm, \u017ee umo\u017e\u0148uje za\u0159\u00edzen\u00edm p\u0159en\u00e1\u0161et data p\u0159\u00edmo do pam\u011bti a z pam\u011bti. #DMA #v\u00fdkon syst\u00e9mu<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6575","dictionary","type-dictionary","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Direct Memory Access Dma - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about Direct Memory Access (DMA) and how it can improve system performance by allowing devices to transfer data directly to and from memory. #DMA #systemperformance\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/cs\/slovnik\/primy-pristup-do-pameti-dma\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Direct Memory Access Dma\" \/>\n<meta property=\"og:description\" content=\"Learn about Direct Memory Access (DMA) and how it can improve system performance by allowing devices to transfer data directly to and from memory. #DMA #systemperformance\" \/>\n<meta property=\"og:url\" content=\"https:\/\/thecodest.co\/cs\/slovnik\/primy-pristup-do-pameti-dma\/\" \/>\n<meta property=\"og:site_name\" content=\"The Codest\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thecodest.co\/app\/uploads\/2024\/06\/cover-image.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"675\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/direct-memory-access-dma\\\/\",\"url\":\"https:\\\/\\\/thecodest.co\\\/dictionary\\\/direct-memory-access-dma\\\/\",\"name\":\"Direct Memory Access Dma - 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The Codest","description":"P\u0159e\u010dt\u011bte si o p\u0159\u00edm\u00e9m p\u0159\u00edstupu do pam\u011bti (DMA) a o tom, jak m\u016f\u017ee zlep\u0161it v\u00fdkon syst\u00e9mu t\u00edm, \u017ee umo\u017e\u0148uje za\u0159\u00edzen\u00edm p\u0159en\u00e1\u0161et data p\u0159\u00edmo do pam\u011bti a z pam\u011bti. #DMA #v\u00fdkon syst\u00e9mu","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/thecodest.co\/cs\/slovnik\/primy-pristup-do-pameti-dma\/","og_locale":"cs_CZ","og_type":"article","og_title":"Direct Memory Access Dma","og_description":"Learn about Direct Memory Access (DMA) and how it can improve system performance by allowing devices to transfer data directly to and from memory. #DMA #systemperformance","og_url":"https:\/\/thecodest.co\/cs\/slovnik\/primy-pristup-do-pameti-dma\/","og_site_name":"The Codest","og_image":[{"width":1200,"height":675,"url":"https:\/\/thecodest.co\/app\/uploads\/2024\/06\/cover-image.png","type":"image\/png"}],"twitter_card":"summary_large_image","twitter_misc":{"Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/thecodest.co\/dictionary\/direct-memory-access-dma\/","url":"https:\/\/thecodest.co\/dictionary\/direct-memory-access-dma\/","name":"P\u0159\u00edm\u00fd p\u0159\u00edstup do pam\u011bti Dma - 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