LINUX欏靛紡綆＄悊
PGD PMD PT PTE
欏佃〃鐩爣 涓棿鐩綍 欏佃〃 欏佃〃欏?/p>
LINUX鍦?2浣嶅湴鍧涓嬮噰鍙栦簩灞傛槧灝?br>#define PGDIR_SHIFT 22
#define PTRS_PER_PGD 1024
#define PMD_SHIFT 22
#define PTRS_PER_PMD 1
#define PTRS_PER_PTE 1024
鏍規(guī)嵁浠ヤ笂瀹忓畾涔?PMD琚畬緹庣殑鏋剁┖浜?jiǎn)锛岃岀浉褰撲簬閲囧彇浜?jiǎn)浜屽眰鏄牉?/p>
鍏朵腑PGD鐢ㄤ簡(jiǎn)綰挎у湴鍧鐨勬渶楂?0浣?涓?nbsp; MMU 瀵瑰簲
綰挎у湴鍧鐨勪腑闂?0浣嶆槸鎵瀵瑰簲鐨凱TE鍦≒T涓殑绱㈠紩
鍓╀笅鐨勬渶浣?2浣嶅垯鏄〉涓殑鍋忕Щ閲?/p>
铏氭嫙鍦板潃 = 孌靛熀鍦板潃錛氭鍋忕Щ閲?br> 16浣?nbsp; 32浣?br>鏇村噯紜殑璁叉槸孌甸夋嫨瀛愪簡(jiǎn)鍚?br>
鍦↙INUX涓鍩哄湴鍧 = 0錛堜笅闈㈢殑____KERNEL_CS絳夛級(jí)錛屾墍浠ュ彲浠ヨ涓虹嚎鎬у湴鍧涓庤櫄鎷熷湴鍧鎬繪槸鐩哥瓑鐨勶紝浣嗗叾鏈川涓嶆槸涓涓笢瑗?br>
0xC0000000-0xFFFFFFFF涓哄唴鏍稿崰鐢?br>0x0-0xBFFFFFFF涓虹敤鎴鋒帶浠?
鍐呮牳鐨勮櫄鎷熷唴瀛樹負(fù)綆鍗曠殑綰挎ф槧灝?br>#__PAGE_OFFSET (0xC0000000)
#define PAGE_OFFSET ((unsigned long) __PAGE_OFFSET)
#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x) +PAGE_OFFSET)
__pa鏄粠铏氭嫙鍦板潃杞崲鎴愮墿鐞嗗湴鍧
__va鏄粠鐗╃悊鍦板潃杞崲鎴愯櫄鎷熷湴鍧
鍦℅DT涓湁4涓鎻忚堪絎?br>鍏剁儲(chǔ)寮曟槸2-5
鍒嗗埆鏄?br>__KERNEL_CS 鍐呮牳浠ｇ爜孌?br>__KERNEL_DS 鍐呮牳鏁版嵁孌?br>__USER_CS 鐢ㄦ埛浠ｇ爜孌?br>__USER_DS 鐢ㄦ埛鏁版嵁孌?/p>
#define start_thread(regs,new_eip,new_esp) do {\
__asm__("movl %0,%%fs;movl %0,%%gs"::"r"(0)); \
set_fs(USER_DS);
regs->xds = __USER_DS; \
regs->xes = __USER_DS; \
regs->xss = __USER_DS; \
regs->xcs = __USER_CS; \
regs->eip = new_eip; \
regs->esp = new_esp; \
}while(0)
閫氳繃榪欐瀹忓彲浠ョ湅鍑猴紝LINUX娌＄敤孌靛紡瀛樺偍錛岃櫧鐒跺畠涔熻蛋浜?jiǎn)杩欎釜娴伣E?/p>
MMU鐨勬祦紼?MMU浣跨敤鐗╃悊鍦板潃
欏靛紡鏄犲皠
浠嶳EG CR3鎷縋GD鐨勫湴鍧
鎵懼埌欏甸潰鐩綍錛岀嚎鎬у湴鍧涓殑楂?0浣嶄負(fù)绱㈠紩錛屾壘鍒伴〉闈㈢洰褰曢」錛屼粠涓嬁楂?0浣嶄綔涓洪〉闈㈣〃鐨勭儲(chǔ)寮曪紝欏甸潰琛ㄤ笌4k瀛楄妭杈圭晫瀵歸綈錛孋PU鑷姩琛ュ厖鍓?2浣嶄負(fù)0寰楀埌欏甸潰琛ㄥ湴鍧銆?/p>
鐒跺悗鎷跨嚎鎬у湴鍧鐨勪腑闂?0浣嶏紝寰楀埌欏甸潰琛ㄤ腑鐨勭儲(chǔ)寮曪紝鎷垮埌欏甸潰琛ㄩ」錛岄〉闈㈣〃欏圭殑楂?0浣嶅湪浣庝綅琛ュ厖12涓?錛屽啀鍔犱笂綰挎у湴鍧鐨勪綆12浣嶇粍鎴愮墿鐞嗗湴鍧銆?/p>
mm_struct 浠誨姟鐩稿叧鐨勮櫄鎷熷唴瀛?br>vm_area_struct 涓孌佃櫄鎷熷唴瀛樼殑鎶借薄錛屼篃鍙互鐞嗚В涓烘
mm_struct涓嫢鏈塿m_area_struct鐨勬寚閽?br>鍦╲m_area_struct澶氱殑鏃跺欎嬌鐢╝vl鏍?wèi)鏉ュ瓨鍌?br>mem_map_t 鐗╃悊欏佃〃
zone_struct 鐗╃悊鍐呭瓨鐨勫尯緇撴瀯錛寊one_struct鎶婄墿鐞嗗唴瀛樺垎鎴愪簡(jiǎn)鍑犱釜閮ㄥ垎
ZONE_DMA 0 渚汥MA浣跨敤
ZONE_NORMAL 鏅氫嬌鐢?br>ZONE_HIGHMEN 楂樻鍐呭瓨錛屽唴鏍告槧灝勪笉鍒?/p>
鐗╃悊鍐呭瓨涔嬮棿鍖虹殑鍒掑垎騫朵笉鏄己鍒剁殑錛屽鏋滄煇涓涓尯宸茬粡娌℃湁鍐呭瓨鍙敤錛屾槸鍙互鍘誨埆鐨勫尯鎷垮唴瀛樼殑
鍏跺疄涓鐩村鍐呮牳鐨勫鍧鏈変簺鐤戦棶
涓嶈繃鍒氬垰浼間箮鎯抽氫簡(jiǎn)
鍐呮牳浼?xì)鍋氶鏄牉畡锛屾妸PGD絎?68欏逛互鍚庣殑閮藉仛鏄犲皠錛屼篃灝辨槸1G鐨勭┖闂?br>鑰岃繖縐嶆槧灝勫簲璇ユ槸婊¤凍__pa()瀹忥紝鍗崇嚎鎬у湴鍧涓庣墿鐞嗗湴鍧鏄嚎鎬ф槧灝勭殑銆?br>鎵浠ユ渶緇坃_pa()瀹忚鐢ㄤ綔鍦ㄥ唴鏍鎬唬鐮佷腑鏄炬х殑鑾峰緱鏌愪釜綰挎у湴鍧鎵瀵瑰簲鐨勭墿鐞嗗湴鍧
鑰孧MU璐熻矗鎶婁竴涓嚎鎬у湴鍧闅愬紡鐨勮漿鎴愪簡(jiǎn)鐗╃悊鍦板潃錛岃岃繖宸茶漿鎹笌鍐呮牳浠ｇ爜鏃犲叧銆?br>涓嶇煡榪欐牱鐞嗚В鏄惁姝ｇ‘錛?br>
浠婂ぉ鍙湅鍒頒簡(jiǎn)榪欓噷
寰呯畫……
璇磋搗鏉ユ妸榪欎箞涓笢瑗挎斁鍒伴欏靛緢涓嶅ソ鎰忔濓紝涓昏鐩殑鏄笇鏈涙湁鐪嬪埌鐨勪漢甯垜鎸囨涓涓嬫垜鎵璁ょ煡鐨勯敊璇垨鑰呰В鎯戙傝阿璋㈠暒:)
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