{"id":5016,"date":"2022-01-27T14:55:52","date_gmt":"2022-01-27T05:55:52","guid":{"rendered":"https:\/\/now0930.pe.kr\/wordpress\/?p=5016"},"modified":"2022-01-27T14:56:25","modified_gmt":"2022-01-27T05:56:25","slug":"linux-pages","status":"publish","type":"post","link":"https:\/\/now0930.pe.kr\/wordpress\/linux-pages\/","title":{"rendered":"linux pages"},"content":{"rendered":"\n<h3 class=\"wp-block-heading\" id=\"pages\">Pages<\/h3>\n\n\n\n<p>\uc5f0\uc18d\ub41c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\uc744 \ud14c\uc2a4\ud2b8 \ud588\ub2e4. dmes\ub85c \ubcf4\uba74 \uc5b4\ub290 \uc815\ub3c4 \ucd9c\ub825\ud558\ub2e4 \ub04a\uc5b4 \ubc84\ub9b0\ub2e4. \ub9c8\uc9c0\ub9c9 \ub370\uc774\ud130\ub97c \ud655\uc778 \ud588\ub2e4.<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">#include&lt;linux\/kernel.h>\n#include&lt;linux\/init.h>\n#include&lt;linux\/module.h>\n#include &lt;linux\/slab.h>\n#include &lt;linux\/mempool.h>\n\n#define PAGES_ORDER 2\n\nchar* data;\nstatic int __init hello_world_init(void) \/* Constructor *\/\n{\n\tprintk(KERN_INFO \"hello, pages\\n\");\n\t\/* memory \ud560\ub2f9*\/\n\tdata = (char*)__get_free_pages(GFP_KERNEL, PAGES_ORDER);\n\tif (!data){\n\t\tprintk(\"no pages allocated\\n\");\n\t\treturn ENOMEM;\n\t}\n\t\/* 0\uc73c\ub85c \ucd08\uae30\ud654*\/\n\tmemset(data, 'c', PAGE_SIZE &lt;&lt; PAGES_ORDER); \n\tprintk(KERN_INFO \"data: pos:%p, size: %0xd, %d\\n\", data, (int)(PAGE_SIZE &lt;&lt; PAGES_ORDER), data[(PAGE_SIZE &lt;&lt; PAGES_ORDER)-1]);\n\treturn 0;\n}\n\nvoid __exit hello_world_exit(void)\n{\n\tprintk(KERN_INFO \"good bye, pages\\n\");\n\tfree_pages((unsigned long)data, PAGES_ORDER);\n\n}\nmodule_init(hello_world_init);\nmodule_exit(hello_world_exit);\n\nMODULE_LICENSE(\"GPL\");\nMODULE_AUTHOR(\"now0930\");\nMODULE_DESCRIPTION(\"pages test\");<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">pi@raspberrypi:~\/rasp\/advancedMemory\/pages $ dmesg | tail -10\n[ 1104.594762] hello, pages\n[ 1104.594802] data: pos:c32289cc, size: 4000d, 99\n[ 1122.403587] good bye, pages<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Pages \uc5f0\uc18d\ub41c \uba54\ubaa8\ub9ac\ub97c \ud560\ub2f9\uc744 \ud14c\uc2a4\ud2b8 \ud588\ub2e4. dmes\ub85c \ubcf4\uba74 \uc5b4\ub290 \uc815\ub3c4 \ucd9c\ub825\ud558\ub2e4 \ub04a\uc5b4 \ubc84\ub9b0\ub2e4. \ub9c8\uc9c0\ub9c9 \ub370\uc774\ud130\ub97c \ud655\uc778 \ud588\ub2e4.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[12],"tags":[775,1024,1028],"class_list":["post-5016","post","type-post","status-publish","format-standard","hentry","category-12","tag-c","tag-memory","tag-pages"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/5016","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/comments?post=5016"}],"version-history":[{"count":2,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/5016\/revisions"}],"predecessor-version":[{"id":5018,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/posts\/5016\/revisions\/5018"}],"wp:attachment":[{"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/media?parent=5016"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/categories?post=5016"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/now0930.pe.kr\/wordpress\/wp-json\/wp\/v2\/tags?post=5016"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}