{"id":2193,"date":"2011-06-26T22:10:34","date_gmt":"2011-06-26T13:10:34","guid":{"rendered":"http:\/\/pchero21.com\/?p=2193"},"modified":"2011-06-26T22:10:34","modified_gmt":"2011-06-26T13:10:34","slug":"os-%ec%bb%a4%eb%84%90%ec%9d%98-%ea%b5%ac%ec%a1%b0%ec%99%80-%ec%9b%90%eb%a6%ac-3-protected-mode%eb%a1%9c-%eb%b3%80%ed%99%98","status":"publish","type":"post","link":"http:\/\/pchero21.com\/?p=2193","title":{"rendered":"OS \ucee4\ub110\uc758 \uad6c\uc870\uc640 \uc6d0\ub9ac : 3. Protected Mode\ub85c \ubcc0\ud658"},"content":{"rendered":"<p>\uba40\ud2f0\ud0dc\uc2a4\ud0b9 \uae30\ub2a5\uc73c\ub85c \uc5ec\ub7ec \ud504\ub85c\uc138\uc2a4\ub97c \ub3d9\uc2dc\uc5d0 \ub3d9\uc791\uc2dc\ud0a4\ub294 \uac83, \uba54\ubaa8\ub9ac \ud398\uc774\uc9d5 \uc2dc\uc2a4\ud15c\uc744 \uad6c\ud604\ud558\uc5ec \uc801\uc740 \uc591\uc758 \uba54\ubaa8\ub9ac\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \uad00\ub9ac\ud558\ub294 \uac83 \ub4f1\uc740 \ubaa8\ub450 Protected Mode\uc5d0\uc11c \uc774\ub8e8\uc5b4\uc9c4\ub2e4. PC\uc5d0 \uc804\uc6d0\uc774 \ub4e4\uc5b4\uac04 \ud6c4 CPU\uc758 \ucd08\uae30 \ubaa8\ub4dc\uc778 Real Mode\uc640\ub294 \ub2ec\ub9ac Protected Mode\ub85c\ub294 \uc791\uc131\ub41c \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud574\uc11c \uba87\uba87\uc758 \uc124\uc815\uc744 \ud589\ud55c \ub4a4\uc5d0 \ub4e4\uc5b4\uac00\uc57c \ud55c\ub2e4.<\/p>\n<p><strong>16\ube44\ud2b8 Real Mode<\/strong><\/p>\n<p>Real Mode\ub294 PC\uac00 \ubd80\ud305\ud560 \ub54c \ub9e8 \ucc98\uc74c \ub3d9\uc791\ud558\ub294 CPU \ubaa8\ub4dc\uc774\ub2e4. \uc774 \ubaa8\ub4dc\ub294 16\ube44\ud2b8\ub85c \ub3d9\uc791\ud558\uae30 \ub54c\ubb38\uc5d0 \ubaa8\ub4e0 \ub808\uc9c0\uc2a4\ud130\ub97c 16\ube44\ud2b8\uc758 \ud615\ud0dc\ub85c \uc0ac\uc6a9\ud55c\ub2e4.<\/p>\n<p>AX, BX, CX, DX \ub4f1\uacfc \uac19\uc740 \ub808\uc9c0\uc2a4\ud130\ub4e4\uc740 \ubaa8\ub450 16\ube44\ud2b8\uc758 \ud55c \uac1c\uc758 WORD\ub85c \ub418\uc5b4 \uc788\uace0, \ucd5c\ub300 \uc800\uc7a5\ud560 \uc218 \uc788\ub294 \uc218\ub294 64K(10\uc9c4\uc218 65535, 16\uc9c4\uc218 0xFFFF)\ubfd0\uc774\ub2e4.<\/p>\n<blockquote><p>\uadf8\ub9ac\uace0, \uc778\ud154 X86 \uacc4\uc5f4\uc758 CPU\uc5d0\uc11c\ub294 \ud504\ub85c\uadf8\ub798\uba38\uac00 RAM \uc0c1\uc758 \uc5b4\ub5a4 \uc8fc\uc18c\uc5d0 \uc811\uadfc\ud558\uace0 \uc2f6\uc744 \ub54c \ub808\uc9c0\uc2a4\ud130\uc5d0 \uadf8 \uc218\ub97c \ubc14\ub85c \ub123\uc5b4 \uc0ac\uc6a9\ud560 \uc218 \uc5c6\uace0, \ubc18\ub4dc\uc2dc \uc138\uadf8\uba3c\ud2b8:\uc624\ud504\uc14b \ubc29\uc2dd\uc73c\ub85c \ub450 \uac1c\uc758 \ub808\uc9c0\uc2a4\ud130\ub97c \uc0ac\uc6a9\ud558\uc5ec \uc8fc\uc18c\uc5d0 \uc811\uadfc\ud55c\ub2e4.<\/p><\/blockquote>\n<p>16\ube44\ud2b8 Real Mode\uc5d0\uc11c\ub3c4 \ub2f9\uc5f0\ud788 \uc138\uadf8\uba3c\ud2b8 \ub808\uc9c0\uc2a4\ud130, \uc624\ud504\uc14b \ub808\uc9c0\uc2a4\ud130 \ubaa8\ub450 16\ube44\ud2b8 \uac12\ubc16\uc5d0\ub294 \ucde8\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Protected Mode<\/strong><\/p>\n<p>Protected Mode\uc5d0\uc11c \uc8fc\uc18c \uc9c0\uc815\uc744 \ud558\uae30\u00a0 \uc704\ud574\uc11c\ub294 Real Mode ~ Protected Mode \uc804\ud658 \uc804\uc5d0 \ubbf8\ub9ac \ud558\ub098\uc758 \ud14c\uc774\ube14(GDT : Global Descriptor Table)\uc744 \uc900\ube44\ud574\uc57c \ud55c\ub2e4. \uc774 \ud14c\uc774\ube14\uc740 \uc5b4\ub5a4 \ud615\uc2dd\uc774 \uc788\ub294 \ub370\uc774\ud130\uc758 \ub098\uc5f4\uc774\uace0, RAM \uc601\uc5ed \uc911 \uc5b4\ub514\ub4e0\uc9c0 \uae30\uc785\ud574 \ub193\uc744 \uc218 \uc788\ub2e4.<\/p>\n<p>\uc774 \ud14c\uc774\ube14\uc5d0\ub294 \uac01 \uc138\uadf8\uba3c\ud2b8 \uc601\uc5ed\uc5d0 \ub300\ud574 \uc774\uac83\ub4e4\uc744 \uc5b4\ub5bb\uac8c \uc0ac\uc6a9\ud560 \uac83\uc774\uc9c0\uc5d0 \ub300\ud574 \uc124\uba85\ud574 \ub193\ub294\ub2e4. \uc774\uac83\uc740 &#8220;\ucee4\ub110\uc774 \uc774\uc81c\ubd80\ud130 \uba54\ubaa8\ub9ac\ub97c \uc5b4\ub5bb\uac8c \uc0ac\uc6a9\ud558\uaca0\ub2e4&#8221;\ub77c\uace0 \ud558\ub294 \uc124\uacc4\uc11c\uc640 \ud761\uc0ac\ud55c \uac83\uc774\ub2e4.<\/p>\n<p>\ud14c\uc774\ube14\uc744 \uad6c\uc131\ud558\ub294 \uac01\uac01\uc758 \uc694\uc18c\ub4e4\uc5d0\ub294 \ud558\ub098\uc758 \uc138\uadf8\uba3c\ud2b8\ub97c \ud45c\ud604\ud558\uae30 \uc704\ud574\uc11c Base Address, Limit, \uc18d\uc131\uc758 \uc815\ubcf4\ub97c \ub123\uc5b4\ub454\ub2e4. \ud558\ub098\uc758 \uc694\uc18c\ub97c \uc9c0\uce6d\ud558\uc5ec \ub514\uc2a4\ud06c\ub9bd\ud130(Descriptor)\ub77c\uace0\u00a0 \ubd80\ub974\uace0, \uc5ec\ub7ec \uac1c\uc758 \ub514\uc2a4\ud06c\ub9bd\ud130\ub97c \ubaa8\uc544\ub450\uc5c8\ub2e4\uace0 \ud558\uc5ec GDT-\ub514\uc2a4\ud06c\ub9bd\ud130 \ud14c\uc774\ube14\uc774\ub77c\uace0 \ud558\ub294 \uac83\uc774\ub2e4.<\/p>\n<p>Base Address\ub780 Real Mode\uc5d0\uc11c CS \ub808\uc9c0\uc2a4\ud130\uc5d0 \uc138\uadf8\uba3c\ud2b8\uac00 \uc2dc\uc791 \uc8fc\uc18c\ub97c \ub123\uc5b4\ub450\ub294 \uac83\uacfc \uac19\uc740 \uac83\uc774\uba70, \uc774 \uc138\uadf8\uba3c\ud2b8\uc758 \uc2dc\uc791\uc744 \ub098\ud0c0\ub0b8\ub2e4. CPU\ub294 \ud504\ub85c\uadf8\ub798\uba38\uc758 \uba85\ub839\uc5d0 \ub530\ub77c\uc11c \ud14c\uc774\ube14\uc5d0\uc11c Base Address\ub97c \ucc3e\uc544\ub0b4\uc11c CS, DS \ub4f1\uc758 \ub808\uc9c0\uc2a4\ud130\uc5d0 \ub123\uc5b4\ub454\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Protected Mode \uc758 \uc7a5\uc810<\/strong><\/p>\n<p>1. Limit \uac12\uc744 \ucd5c\ub300 0xFFFFFFFF\uae4c\uc9c0 \uc9c0\uc815\ud560 \uc218 \uc788\uc73c\ubbc0\ub85c Base Address\ub97c 0\uc73c\ub85c \uc9c0\uc815\ud55c\ub2e4\uba74 \ucd5c\ub300 4GB\uc758 \uc601\uc5ed\uc744 \uc624\ud504\uc14b\uc744 \uac00\uc9c0\uace0 \ub9c8\uc74c\ub300\ub85c \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4.<br \/>\nReal Mode\uc5d0\uc11c\ub294 \uc624\ud504\uc14b\uc744 16\ube44\ud2b8\ub85c 0x0000 ~ 0xFFFF\uae4c\uc9c0\ubc16\uc5d0 \uc9c0\uc815\ud560 \uc218 \uc5c6\uc5c8\ub2e4\ub294 \uac83\uc744 \uc0dd\uac01\ud558\uba74 \uc624\ud504\uc14b\uc73c\ub85c \ub9e4\uc6b0 \uc790\uc720\ub86d\uac8c \ud504\ub85c\uadf8\ub7a8\uc744 \uc774\ub3d9\uc2dc\ud0a4\uac70\ub098 \ub370\uc774\ud130\ub97c \uc77d\uc5b4\uc62c \uc218 \uc788\ub2e4\ub294 \ud3b8\ub9ac\ud568\uc774 \uc788\ub2e4\ub294 \uac83\uc744 \uc54c \uc218 \uc788\ub2e4.<\/p>\n<p>2. \uc704\uc5d0\uc11c \uc624\ud504\uc14b\uc744 \ub9c8\uc74c\ub300\ub85c \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4\ub294 \uc124\uba85\uc744 \ud588\uc73c\ub098, \ub54c\uc5d0 \ub530\ub77c\uc11c\ub294 DPL \uac12\uc744 \uc870\uc791\ud558\uc5ec \ucee4\ub110 \uc2dc\uc2a4\ud15c \uc601\uc5ed\uc73c\ub85c \uc720\uc800 \uc601\uc5ed\uc758 \uc5b4\ud50c\ub9ac\ucf00\uc774\uc158 \ud504\ub85c\uadf8\ub7a8\uc774 \uc811\uadfc\ud558\uc9c0 \ubabb\ud558\ub3c4\ub85d \ud558\uac70\ub098, \ucf54\ub4dc\/\ub370\uc774\ud130 \uc138\uadf8\uba3c\ud2b8\ub97c \ubd84\ub9ac\uc2dc\ucf1c \ucf54\ub4dc\ub97c \ub370\uc774\ud130\ub85c\uc11c \uc77d\uac70\ub098 \uc4f0\uc9c0 \ubabb\ud558\ub3c4\ub85d \ub9c9\uc544\ub193\uc744 \uc218\ub3c4 \uc788\ub2e4.<\/p>\n<p>3. Protected Mode\uc758 GDT\uc758 \uac01 \ub514\uc2a4\ud06c\ub9bd\ud130\uc5d0\ub294 \uac01 \uc138\uadf8\uba3c\ud2b8\uc758 \uc2dc\uc791 \uc8fc\uc18c\ub97c \ubb3c\ub9ac \uc8fc\uc18c\ub864 \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4. GDT\uc5d0\ub294 \uc0c1\ub2f9\ud788 \ub9ce\uc740 \uc138\uadf8\uba3c\ud2b8\ub97c \uc9c0\uc815\ud560 \uc218 \uc788\uace0, \uc2dc\uc791 \uc8fc\uc18c\ub97c \ub8e8\ub9ac \uc8fc\uc18c \uac12\uc73c\ub85c \uc9c1\uc811 \ub123\uae30 \ub54c\ubb38\uc5d0 1Byte \ub2e8\uc704\ub85c \uc9c0\uc815\ud560 \uc218 \uc788\ub2e4.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>GDT<\/strong><\/p>\n<p>\ub514\uc2a4\ud06c\ub9bd\ud130\uc758 \ubaa8\uc2b5<\/p>\n<p style=\"text-align: center;\"><a href=\"http:\/\/pchero21.com\/wp-content\/uploads\/2011\/06\/GDT11.jpg\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-2195\" title=\"GDT\" src=\"http:\/\/pchero21.com\/wp-content\/uploads\/2011\/06\/GDT11.jpg\" alt=\"\" width=\"732\" height=\"219\" \/><\/a><\/p>\n<p style=\"text-align: left;\">&nbsp;<\/p>\n<p style=\"text-align: center;\">&nbsp;<\/p>\n<p style=\"text-align: center;\">&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\uba40\ud2f0\ud0dc\uc2a4\ud0b9 \uae30\ub2a5\uc73c\ub85c \uc5ec\ub7ec \ud504\ub85c\uc138\uc2a4\ub97c \ub3d9\uc2dc\uc5d0 \ub3d9\uc791\uc2dc\ud0a4\ub294 \uac83, \uba54\ubaa8\ub9ac \ud398\uc774\uc9d5 \uc2dc\uc2a4\ud15c\uc744 \uad6c\ud604\ud558\uc5ec \uc801\uc740 \uc591\uc758 \uba54\ubaa8\ub9ac\ub97c \ud6a8\uc728\uc801\uc73c\ub85c \uad00\ub9ac\ud558\ub294 \uac83 \ub4f1\uc740 \ubaa8\ub450 Protected Mode\uc5d0\uc11c \uc774\ub8e8\uc5b4\uc9c4\ub2e4. PC\uc5d0 \uc804\uc6d0\uc774 \ub4e4\uc5b4\uac04 \ud6c4 CPU\uc758 \ucd08\uae30 \ubaa8\ub4dc\uc778 Real Mode\uc640\ub294 \ub2ec\ub9ac Protected Mode\ub85c\ub294 \uc791\uc131\ub41c \ud504\ub85c\uadf8\ub7a8\uc744 \ud1b5\ud574\uc11c \uba87\uba87\uc758 \uc124\uc815\uc744 \ud589\ud55c &hellip; <a href=\"http:\/\/pchero21.com\/?p=2193\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[26],"tags":[],"_links":{"self":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/2193"}],"collection":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2193"}],"version-history":[{"count":0,"href":"http:\/\/pchero21.com\/index.php?rest_route=\/wp\/v2\/posts\/2193\/revisions"}],"wp:attachment":[{"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2193"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2193"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/pchero21.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2193"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}