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Linux瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮鐨勬弿榪?/p> 銆銆Linux璁捐浜嗕竴涓氱敤鐨勬暟鎹粨鏋剅esource鏉ユ弿榪板悇縐?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮錛堝錛?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛銆佸璁懼唴瀛樸丏MA鍜孖RQ絳夛級銆傝緇撴瀯瀹氫箟鍦╥nclude/linux/ioport.h澶存枃浠朵腑錛?/p> 銆銆鍚勬垚鍛樼殑鍚箟濡備笅錛?/p> 銆銆1. name鎸囬拡錛氭寚鍚戞璧勬簮鐨勫悕縐般?br />銆銆2. start鍜宔nd錛氳〃紺鴻祫婧愮殑璧峰鐗╃悊鍦板潃鍜岀粓姝㈢墿鐞嗗湴鍧銆傚畠浠‘瀹氫簡璧勬簮鐨勮寖鍥達紝涔熷嵆鏄竴涓棴鍖洪棿[start,end]銆?br />銆銆3. flags錛氭弿榪版璧勬簮灞炴х殑鏍囧織錛堣涓嬮潰錛夈?br />銆銆4. 鎸囬拡parent銆乻ibling鍜宑hild錛氬垎鍒負鎸囧悜鐖朵翰銆佸厔寮熷拰瀛愯祫婧愮殑鎸囬拡銆?/p> 銆銆灞炴lags鏄竴涓猽nsigned long綾誨瀷鐨?2浣嶆爣蹇楀鹼紝鐢ㄤ互鎻忚堪璧勬簮鐨勫睘鎬с傛瘮濡傦細璧勬簮鐨勭被鍨嬨佹槸鍚﹀彧璇匯佹槸鍚﹀彲緙撳瓨錛屼互鍙婃槸鍚﹀凡琚崰鐢ㄧ瓑銆備笅闈㈡槸涓閮ㄥ垎甯哥敤灞炴ф爣蹇椾綅鐨勫畾涔夛紙ioport.h錛夛細 #define IORESOURCE_IO聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x00000100聽聽聽聽聽聽聽 /* Resource type */ #define IORESOURCE_PREFETCH聽聽聽聽聽聽聽 0x00001000聽聽聽聽聽聽聽 /* No side effects */ #define IORESOURCE_UNSET聽聽聽聽聽聽聽 0x20000000 聽 銆銆鎸囬拡parent銆乻ibling鍜宑hild鐨勮緗槸涓轟簡浠ヤ竴縐嶆爲鐨勫艦寮忔潵綆$悊鍚勭I/O璧勬簮銆?/p> 3錛? Linux瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮鐨勭鐞?/p> 銆銆Linux鏄互涓縐嶅掔疆鐨勬爲褰㈢粨鏋勬潵綆$悊姣忎竴綾?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮錛堝錛?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛銆佸璁懼唴瀛樸丏MA鍜孖RQ錛夌殑銆傛瘡涓綾?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮閮藉搴旀湁涓棰楀掔疆鐨勮祫婧愭爲錛屾爲涓殑姣忎竴涓妭鐐歸兘鏄竴涓猺esource緇撴瀯錛岃屾爲鐨勬牴緇撶偣root鍒欐弿榪頒簡璇ョ被璧勬簮鐨勬暣涓祫婧愮┖闂淬?/p> 銆銆鍩轟簬涓婅堪榪欎釜鎬濇兂錛孡inux鍦╧ernel/Resource.c鏂囦歡涓疄鐜頒簡瀵硅祫婧愮殑鐢寵銆侀噴鏀懼強鏌ユ壘絳夋搷浣溿?/p> 銆銆3錛?錛? I/O璧勬簮鐨勭敵璇?/p> 銆銆鍋囪鏌愮被璧勬簮鏈夊涓嬭繖鏍蜂竴棰楄祫婧愭爲錛?/p> 銆銆鑺傜偣root銆乺1銆乺2鍜宺3瀹為檯涓婇兘鏄竴涓猺esource緇撴瀯綾誨瀷銆傚瓙璧勬簮r1銆乺2鍜宺3閫氳繃sibling鎸囬拡閾炬帴鎴愪竴鏉″崟鍚戦潪寰幆閾捐〃錛屽叾琛ㄥご鐢眗oot鑺傜偣涓殑child鎸囬拡瀹氫箟錛屽洜姝や篃縐頒負鐖惰祫婧愮殑瀛愯祫婧愰摼琛ㄣ俽1銆乺2鍜宺3鐨刾arent鎸囬拡鍧囨寚鍚戜粬浠殑鐖惰祫婧愯妭鐐癸紝鍦ㄨ繖閲屼篃灝辨槸鍥句腑鐨剅oot鑺傜偣銆?/p> 銆銆鍋囪鎯沖湪root鑺傜偣涓垎閰嶄竴孌?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮錛堢敱鍥句腑鐨勯槾褰卞尯鍩熻〃紺猴級銆傚嚱鏁皉equest_resource()瀹炵幇榪欎竴鍔熻兘銆傚畠鏈変袱涓弬鏁幫細鈶爎oot鎸囬拡錛岃〃紺鴻鍦ㄥ摢涓祫婧愭牴鑺傜偣涓繘琛屽垎閰嶏紱鈶ew鎸囬拡錛屾寚鍚戞弿榪版墍瑕佸垎閰嶇殑璧勬簮錛堝嵆鍥句腑鐨勯槾褰卞尯鍩燂級鐨剅esource緇撴瀯銆傝鍑芥暟鐨勬簮浠g爜濡備笅錛坘ernel/resource.c錛? 聽聽聽聽聽聽聽 write_lock(&resource_lock); 聽 銆銆瀵逛笂榪板嚱鏁扮殑NOTE濡備笅錛?/p> 銆銆鈶犺祫婧愰攣resource_lock瀵規墍鏈夎祫婧愭爲榪涜璇誨啓淇濇姢錛屼換浣曚唬鐮佹鍦ㄨ闂煇涓棰楄祫婧愭爲涔嬪墠閮藉繀欏誨厛鎸佹湁璇ラ攣銆傚叾瀹氫箟濡備笅錛坘ernel/Resource.c錛夛細 銆銆static rwlock_t resource_lock = RW_LOCK_UNLOCKED; 銆銆鈶″彲浠ョ湅鍑猴紝鍑芥暟瀹為檯涓婃槸閫氳繃璋冪敤鍐呴儴闈欐佸嚱鏁癬_request_resource()鏉ュ畬鎴愬疄闄呯殑璧勬簮鍒嗛厤宸ヤ綔銆傚鏋滆鍑芥暟榪斿洖闈炵┖鎸囬拡錛屽垯琛ㄧず鏈夎祫婧愬啿紿侊紱鍚﹀垯錛岃繑鍥濶ULL灝辮〃紺哄垎閰嶆垚鍔熴?/p> 銆銆鈶㈡渶鍚庯紝濡傛灉conflict鎸囬拡涓篘ULL錛屽垯request_resource()鍑芥暟榪斿洖榪斿洖鍊?錛岃〃紺烘垚鍔燂紱鍚﹀垯榪斿洖錛岴BUSY琛ㄧず鎯寵鍒嗛厤鐨勮祫婧愬凡琚崰鐢ㄣ?/p> 銆銆鍑芥暟__request_resource()瀹屾垚瀹為檯鐨勮祫婧愬垎閰嶅伐浣溿傚鏋滃弬鏁皀ew鎵鎻忚堪鐨勮祫婧愪腑鐨勪竴閮ㄥ垎鎴栧叏閮ㄥ凡緇忚鍏跺畠鑺傜偣鎵鍗犵敤錛屽垯鍑芥暟榪斿洖涓巒ew鐩稿啿紿佺殑resource緇撴瀯鐨勬寚閽堛傚惁鍒欏氨榪斿洖NULL銆傝鍑芥暟鐨勬簮浠g爜濡備笅 聽聽聽聽聽聽聽 if (end < start) 聽 銆銆瀵瑰嚱鏁扮殑NOTE錛?/p> 銆銆鈶犲墠涓変釜if璇彞鍒ゆ柇new鎵鎻忚堪鐨勮祫婧愯寖鍥存槸鍚﹁鍖呭惈鍦╮oot鍐咃紝浠ュ強鏄惁鏄竴孌墊湁鏁堢殑璧勬簮錛堝洜涓篹nd蹇呴』澶т簬start錛夈傚惁鍒欏氨榪斿洖root鎸囬拡錛岃〃紺轟笌鏍圭粨鐐圭浉鍐茬獊銆?/p> 銆銆鈶℃帴涓嬫潵鐢ㄤ竴涓猣or寰幆閬嶅巻鏍硅妭鐐箁oot鐨刢hild閾捐〃錛屼互渚挎鏌ユ槸鍚︽湁璧勬簮鍐茬獊錛屽茍灝唍ew鎻掑叆鍒癱hild閾捐〃涓殑鍚堥備綅緗紙child閾捐〃鏄互I/O璧勬簮鐗╃悊鍦板潃浠庝綆鍒伴珮鐨勯『搴忔帓鍒楃殑錛夈備負姝わ紝瀹冪敤tmp鎸囬拡鎸囧悜褰撳墠姝h鎵弿鐨剅esource緇撴瀯錛岀敤鎸囬拡p鎸囧悜鍓嶄竴涓猺esource緇撴瀯鐨剆ibling鎸囬拡鎴愬憳鍙橀噺錛宲鐨勫垵濮嬪間負鎸囧悜root錛?gt;sibling銆侳or寰幆浣撶殑鎵ц姝ラ濡備笅錛?/p> 銆銆l 璁﹖mp鎸囧悜褰撳墠姝h鎵弿鐨剅esource緇撴瀯錛坱mp錛?p錛夈?/p> 銆銆l 鍒ゆ柇tmp鎸囬拡鏄惁涓虹┖錛坱mp鎸囬拡涓虹┖璇存槑宸茬粡閬嶅巻瀹屾暣涓猚hild閾捐〃錛夛紝鎴栬呭綋鍓嶈鎵弿鑺傜偣鐨勮搗濮嬩綅緗畇tart鏄惁姣攏ew鐨勭粨鏉熶綅緗甧nd榪樿澶с傚彧瑕佽繖涓や釜鏉′歡涔嬩竴鎴愮珛鐨勮瘽錛屽氨璇存槑娌℃湁璧勬簮鍐茬獊錛屼簬鏄氨鍙互鎶妌ew閾懼叆child閾捐〃涓細鈶犺緗畁ew鐨剆ibling鎸囬拡鎸囧悜褰撳墠姝h鎵弿鐨勮妭鐐箃mp錛坣ew->sibling=tmp錛夛紱鈶″綋鍓嶈妭鐐箃mp鐨勫墠涓涓厔寮熻妭鐐圭殑sibling鎸囬拡琚慨鏀逛負鎸囧悜new榪欎釜鑺傜偣錛?p=new錛夛紱鈶㈠皢new鐨刾arent鎸囬拡璁劇疆涓烘寚鍚憆oot銆傜劧鍚庡嚱鏁板氨鍙互榪斿洖浜嗭紙榪斿洖鍊糔ULL琛ㄧず娌℃湁璧勬簮鍐茬獊錛夈?/p> 銆銆l 濡傛灉涓婅堪涓や釜鏉′歡閮戒笉鎴愮珛錛岃繖璇存槑褰撳墠琚壂鎻忚妭鐐圭殑璧勬簮鍩熸湁鍙兘涓巒ew鐩稿啿紿侊紙瀹為檯涓婂氨鏄袱涓棴鍖洪棿鏈変氦闆嗭級錛屽洜姝ら渶瑕佽繘涓姝ュ垽鏂備負姝ゅ畠棣栧厛淇敼鎸囬拡p錛岃瀹冩寚鍚憈mp->sibling錛屼互渚夸簬緇х畫鎵弿child閾捐〃銆傜劧鍚庯紝鍒ゆ柇tmp->end鏄惁灝忎簬new->start錛屽鏋滃皬浜庯紝鍒欒鏄庡綋鍓嶈妭鐐箃mp鍜宯ew娌℃湁璧勬簮鍐茬獊錛屽洜姝ゆ墽琛宑ontinue璇彞錛岀戶緇悜涓嬫壂鎻廲hild閾捐〃銆傚惁鍒欙紝濡傛灉tmp->end澶т簬鎴栫瓑浜巒ew->start錛屽垯璇存槑tmp->[start,end]鍜宯ew->[start,end]涔嬮棿鏈変氦闆嗐傛墍浠ヨ繑鍥炲綋鍓嶈妭鐐圭殑鎸囬拡tmp錛岃〃紺哄彂鐢熻祫婧愬啿紿併?/p> 銆銆3錛?錛? 璧勬簮鐨勯噴鏀?/p> 銆銆鍑芥暟release_resource()鐢ㄤ簬瀹炵幇I/O璧勬簮鐨勯噴鏀俱傝鍑芥暟鍙湁涓涓弬鏁扳斺斿嵆鎸囬拡old錛屽畠鎸囧悜鎵瑕侀噴鏀劇殑璧勬簮銆傝搗婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 write_lock(&resource_lock); 聽 銆銆鍙互鐪嬪嚭錛屽畠瀹為檯涓婇氳繃璋冪敤__release_resource()榪欎釜鍐呴儴闈欐佸嚱鏁版潵瀹屾垚瀹為檯鐨勮祫婧愰噴鏀懼伐浣溿傚嚱鏁癬_release_resource()鐨勪富瑕佷換鍔″氨鏄皢璧勬簮鍖哄煙old錛堝鏋滃凡緇忓瓨鍦ㄧ殑璇濓級浠庡叾鐖惰祫婧愮殑child閾捐〃閲嶆憳闄わ紝瀹冪殑婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 p = &old->parent->child; 聽 銆銆瀵逛笂榪板嚱鏁頒唬鐮佺殑NOTE濡備笅錛?/p> 銆銆鍚屽嚱鏁癬_request_resource()鐩哥被浼鹼紝璇ュ嚱鏁頒篃鏄氳繃涓涓猣or寰幆鏉ラ亶鍘嗙埗璧勬簮鐨刢hild閾捐〃銆備負姝わ紝瀹冭tmp鎸囬拡鎸囧悜褰撳墠琚壂鎻忕殑璧勬簮錛岃屾寚閽坧鍒欐寚鍚戝綋鍓嶈妭鐐圭殑鍓嶄竴涓妭鐐圭殑sibling鎴愬憳錛坧鐨勫垵濮嬪間負鎸囧悜鐖惰祫婧愮殑child鎸囬拡錛夈傚驚鐜綋鐨勬楠ゅ涓嬶細 銆銆鈶犻鍏堬紝璁﹖mp鎸囬拡鎸囧悜褰撳墠琚壂鎻忕殑鑺傜偣錛坱mp錛?p錛夈?/p> 銆銆鈶″鏋渢mp鎸囬拡涓虹┖錛岃鏄庡凡緇忛亶鍘嗗畬鏁翠釜child閾捐〃錛屽洜姝ゆ墽琛宐reak璇彞鎺ㄥ嚭for寰幆銆傜敱浜庡湪閬嶅巻榪囩▼涓病鏈夊湪child閾捐〃涓壘鍒板弬鏁皁ld鎵鎸囧畾鐨勮祫婧愯妭鐐癸紝鍥犳鏈鍚庤繑鍥為敊璇鹼紞EINVAL錛岃〃紺哄弬鏁皁ld鏄竴涓棤鏁堢殑鍊箋?/p> 銆銆鈶㈡帴涓嬫潵錛屽垽鏂綋鍓嶈鎵弿鑺傜偣鏄惁灝辨槸鍙傛暟old鎵鎸囧畾鐨勮祫婧愯妭鐐廣傚鏋滄槸錛岄偅灝卞皢old浠巆hild閾捐〃涓幓闄わ紝涔熷嵆璁╁綋鍓嶇粨鐐箃mp鐨勫墠涓涓厔寮熻妭鐐圭殑sibling鎸囬拡鎸囧悜tmp鐨勪笅涓涓妭鐐癸紝鐒跺悗灝唎ld錛?gt;parent鎸囬拡璁劇疆涓篘ULL銆傛渶鍚庤繑鍥?鍊艱〃紺烘墽琛屾垚鍔熴?/p> 銆銆鈶e鏋滃綋鍓嶈鎵弿鑺傜偣涓嶆槸璧勬簮old錛岄偅灝辯戶緇壂鎻廲hild閾捐〃涓殑涓嬩竴涓厓绱犮傚洜姝ゅ皢鎸囬拡p鎸囧悜tmp錛?gt;sibling鎴愬憳銆?/p> 銆銆3錛?錛? 媯鏌ヨ祫婧愭槸鍚﹀凡琚崰鐢紝 銆銆鍑芥暟check_resource()鐢ㄤ簬瀹炵幇媯鏌ユ煇涓孌?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮鏄惁宸茶鍗犵敤銆傚叾婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 tmp.start = start; 聽 銆銆瀵硅鍑芥暟鐨凬OTE濡備笅錛?/p> 銆銆鈶犳瀯閫犱竴涓復鏃惰祫婧恡mp錛岃〃紺烘墍瑕佹鏌ョ殑璧勬簮[start,start+end-1]銆?/p> 銆銆鈶¤皟鐢╛_request_resource()鍑芥暟鍦ㄦ牴鑺傜偣root鐢寵tmp鎵琛ㄧず鐨勮祫婧愩傚鏋渢mp鎵鎻忚堪鐨勮祫婧愯繕琚漢浣跨敤錛屽垯璇ュ嚱鏁拌繑鍥濶ULL錛屽惁鍒欒繑鍥為潪絀烘寚閽堛傚洜姝ゆ帴涓嬫潵鍦╟onflict涓篘ULL鐨勬儏鍐典笅錛岃皟鐢╛_release_resource()灝嗗垰鍒氱敵璇風殑璧勬簮閲婃斁鎺夈?/p> 銆銆鈶㈡渶鍚庢牴鎹甤onflict鏄惁涓篘ULL錛岃繑鍥烇紞EBUSY鎴?鍊箋?/p> 銆銆3錛?錛? 瀵繪壘鍙敤璧勬簮 銆銆鍑芥暟find_resource()鐢ㄤ簬鍦ㄤ竴棰楄祫婧愭爲涓鎵炬湭琚嬌鐢ㄧ殑銆佷笖婊¤凍緇欏畾鏉′歡鐨勶紙涔熷嵆璧勬簮闀垮害澶у皬涓簊ize錛屼笖鍦╗min,max]鍖洪棿鍐咃級鐨勮祫婧愩傚叾鍑芥暟婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 new->start = root->start; 聽 銆銆瀵硅鍑芥暟鐨凬OTE濡備笅錛?/p> 銆銆鍚屾牱錛岃鍑芥暟涔熻閬嶅巻root鐨刢hild閾捐〃錛屼互瀵繪壘鏈浣跨敤鐨勮祫婧愮┖媧炪備負姝わ紝瀹冭this鎸囬拡琛ㄧず褰撳墠姝h鎵弿鐨勫瓙璧勬簮鑺傜偣錛屽叾鍒濆鍊肩瓑浜巖oot->child錛屽嵆鎸囧悜child閾捐〃涓殑絎竴涓妭鐐癸紝騫惰new->start鐨勫垵濮嬪肩瓑浜巖oot->start錛岀劧鍚庣敤涓涓猣or寰幆寮濮嬫壂鎻廲hild閾捐〃錛屽浜庢瘡涓涓鎵弿鐨勮妭鐐癸紝寰幆浣撴墽琛屽涓嬫搷浣滐細 銆銆鈶犻鍏堬紝鍒ゆ柇this鎸囬拡鏄惁涓篘ULL銆傚鏋滀笉涓虹┖錛屽氨璁﹏ew->end絳変簬this->start錛屼篃鍗寵璧勬簮new琛ㄧず褰撳墠璧勬簮鑺傜偣this鍓嶉潰閭d竴孌墊湭浣跨敤鐨勮祫婧愬尯闂淬?/p> 銆銆鈶″鏋渢his鎸囬拡涓虹┖錛岄偅灝辮new->end絳変簬root->end銆傝繖鏈変袱灞傛剰鎬濓細絎竴縐嶆儏鍐靛氨鏄牴緇撶偣鐨刢hild鎸囬拡涓篘ULL錛堝嵆鏍硅妭鐐規病鏈変換浣曞瓙璧勬簮錛夈傚洜姝ゆ鏃跺厛鏆傛椂灝唍ew->end鏀懼埌鏈澶с傜浜岀鎯呭喌灝辨槸宸茬粡閬嶅巻瀹屾暣涓猚hild閾捐〃錛屾墍浠ユ鏃跺氨璁﹏ew琛ㄧず鏈鍚庝竴涓瓙璧勬簮鍚庨潰閭d竴孌墊湭浣跨敤鐨勮祫婧愬尯闂淬?/p> 銆銆鈶㈡牴鎹弬鏁癿in鍜宮ax淇new->[start,end]鐨勫鹼紝浠ヤ嬌璧勬簮new琚寘鍚湪[min,max]鍖哄煙鍐呫?/p> 銆銆鈶f帴涓嬫潵榪涜瀵歸綈鎿嶄綔銆?/p> 銆銆鈶ょ劧鍚庯紝鍒ゆ柇緇忚繃涓婅堪榪欎簺姝ラ鎵褰㈡垚鐨勮祫婧愬尯鍩焠ew鏄惁鏄竴孌墊湁鏁堢殑璧勬簮錛坋nd蹇呴』澶т簬鎴栫瓑浜巗tart錛夛紝鑰屼笖璧勬簮鍖哄煙鐨勯暱搴︽弧瓚硈ize鍙傛暟鐨勮姹傦紙end錛峴tart錛?>=size錛夈傚鏋滆繖涓や釜鏉′歡鍧囨弧瓚籌紝鍒欒鏄庢垜浠凡緇忔壘鍒頒簡涓孌墊弧瓚蟲潯浠剁殑璧勬簮絀烘礊銆傚洜姝ゅ湪瀵筺ew->end鐨勫艱繘琛屼慨姝e悗錛岀劧鍚庡氨鍙互榪斿洖浜嗭紙榪斿洖鍊?琛ㄧず鎴愬姛錛夈?/p> 銆銆鈶ュ鏋滀笂榪頒袱鏉′歡涓嶈兘鍚屾椂婊¤凍錛屽垯璇存槑榪樻病鏈夋壘鍒幫紝鍥犳瑕佺戶緇壂鎻忛摼琛ㄣ傚湪緇х畫鎵弿涔嬪墠錛屾垜浠繕鏄鍒ゆ柇涓涓媡his鎸囬拡鏄惁涓虹┖銆傚鏋滀負絀猴紝璇存槑宸茬粡鎵弿瀹屾暣涓猚hild閾捐〃錛屽洜姝ゅ氨鍙互鎺ㄥ嚭for寰幆浜嗐傚惁鍒欏氨灝唍ew->start鐨勫間慨鏀逛負this->end+1錛屽茍璁﹖his鎸囧悜涓嬩竴涓厔寮熻祫婧愯妭鐐癸紝浠庤岀戶緇壂鎻忛摼琛ㄤ腑鐨勪笅涓涓瓙璧勬簮鑺傜偣銆?/p> 銆銆3錛?錛? 鍒嗛厤鎺ュ彛allocate_resource() 銆銆鍦╢ind_resource()鍑芥暟鐨勫熀紜涓婏紝鍑芥暟allocate_resource()瀹炵幇錛氬湪涓棰楄祫婧愭爲涓垎閰嶄竴鏉℃寚瀹氬ぇ灝忕殑銆佷笖鍖呭惈鍦ㄦ寚瀹氬尯鍩焄min,max]涓殑銆佹湭浣跨敤璧勬簮鍖哄煙銆傚叾婧愪唬鐮佸涓嬶細 聽聽聽 write_lock(&resource_lock); 聽 銆銆3錛?錛? 鑾峰彇璧勬簮鐨勫悕縐板垪琛?/p> 銆銆鍑芥暟get_resource_list()鐢ㄤ簬鑾峰彇鏍硅妭鐐箁oot鐨勫瓙璧勬簮鍚嶅瓧鍒楄〃銆傝鍑芥暟涓昏鐢ㄦ潵鏀寔/proc/鏂囦歡緋葷粺錛堟瘮濡傚疄鐜皃roc/ioports鏂囦歡鍜?proc/iomem鏂囦歡錛夈傚叾婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 fmt = "聽聽聽聽聽聽聽 %08lx-%08lx : %s 聽 銆銆鍙互鐪嬪嚭錛岃鍑芥暟涓昏閫氳繃璋冪敤鍐呴儴闈欐佸嚱鏁癲o_resource_list()鏉ュ疄鐜板叾鍔熻兘錛屽叾婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 while (entry) { 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if ((int) (end-buf) < 80) 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 from = entry->start; 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 buf += sprintf(buf, fmt + offset, from, to, name); 聽聽聽聽聽聽聽 return buf; 聽 銆銆鍑芥暟do_resource_list()涓昏閫氳繃涓涓獁hile{}寰幆浠ュ強閫掑綊宓屽璋冪敤鏉ュ疄鐜幫紝杈冧負綆鍗曪紝榪欓噷灝變笉鍦ㄨ緇嗚В閲婁簡銆?/p> 3錛? 綆$悊I/O Region璧勬簮 銆銆Linux灝嗗熀浜?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鏄犲皠鏂瑰紡鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛鍜屽熀浜庡唴瀛樻槧灝勬柟寮忕殑I/O绔彛璧勬簮緇熺О涓衡?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍖哄煙鈥濓紙I/O Region錛夈?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O Region浠嶇劧鏄竴縐?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璧勬簮錛屽洜姝ゅ畠浠嶇劧鍙互鐢╮esource緇撴瀯綾誨瀷鏉ユ弿榪般備笅闈㈡垜浠氨鏉ョ湅鐪婰inux鏄浣曠鐞?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O Region鐨勩?/p> 銆銆3錛?錛? I/O Region鐨勫垎閰?/p> 銆銆鍦ㄥ嚱鏁癬_request_resource()鐨勫熀紜涓婏紝Linux瀹炵幇浜嗙敤浜庡垎閰?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍖哄煙鐨勫嚱鏁癬_request_region()錛屽涓? 聽聽聽聽聽聽聽 if (res) { 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 write_lock(&resource_lock); 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 for (;;) { 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 conflict = __request_resource(parent, res); 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 /* Uhhuh, that didn't work out.. */ 聽 NOTE錛?/p> 銆銆鈶犻鍏堬紝璋冪敤kmalloc錛堬級鍑芥暟鍦⊿LAB鍒嗛厤鍣ㄧ紦瀛樹腑鍒嗛厤涓涓猺esource緇撴瀯銆?/p> 銆銆鈶$劧鍚庯紝鐩稿簲鐨勬牴鎹弬鏁板煎垵濮嬪寲鎵鍒嗛厤鐨剅esource緇撴瀯銆傛敞鎰忥紒flags鎴愬憳琚垵濮嬪寲涓篒ORESOURCE_BUSY銆?/p> 銆銆鈶㈡帴涓嬫潵錛岀敤涓涓猣or寰幆寮濮嬭繘琛岃祫婧愬垎閰嶏紝寰幆浣撶殑姝ラ濡備笅錛?/p> 銆銆l 棣栧厛錛岃皟鐢╛_request_resource()鍑芥暟榪涜璧勬簮鍒嗛厤銆傚鏋滆繑鍥濶ULL錛岃鏄庡垎閰嶆垚鍔燂紝鍥犳灝辨墽琛宐reak璇彞鎺ㄥ嚭for寰幆錛岃繑鍥炴墍鍒嗛厤鐨剅esource緇撴瀯鐨勬寚閽堬紝鍑芥暟鎴愬姛鍦扮粨鏉熴?/p> 銆銆l 濡傛灉__request_resource()鍑芥暟鍒嗛厤涓嶆垚鍔燂紝鍒欒繘涓姝ュ垽鏂墍榪斿洖鐨勫啿紿佽祫婧愯妭鐐規槸鍚﹀氨鏄埗璧勬簮鑺傜偣parent銆傚鏋滀笉鏄紝鍒欏皢鍒嗛厤琛屼負涓嬮檷涓涓眰嬈★紝鍗寵瘯鍥懼湪褰撳墠鍐茬獊鐨勮祫婧愯妭鐐逛腑榪涜鍒嗛厤錛堝彧鏈夊湪鍐茬獊鐨勮祫婧愯妭鐐規病鏈夎緗甀ORESOURCE_BUSY鐨勬儏鍐典笅鎵嶅彲浠ワ級錛屼簬鏄parent鎸囬拡絳変簬conflict錛屽茍鍦╟onflict->flags&IORESOURCE_BUSY涓?鐨勬儏鍐典笅鎵цcontinue璇彞緇х畫for寰幆銆?/p> 銆銆l 鍚﹀垯濡傛灉鐩稿啿紿佺殑璧勬簮鑺傜偣灝辨槸鐖惰妭鐐筽arent錛屾垨鑰呯浉鍐茬獊璧勬簮鑺傜偣璁劇疆浜咺ORESOURCE_BUSY鏍囧織浣嶏紝鍒欏鍛婂垎閰嶅け璐ャ備簬鏄皟鐢╧free錛堬級鍑芥暟閲婃斁鎵鍒嗛厤鐨剅esource緇撴瀯錛屽茍灝唕es鎸囬拡緗負NULL錛屾渶鍚庣敤break璇彞鎺ㄥ嚭for寰幆銆?/p> 銆銆鈶f渶鍚庯紝榪斿洖鎵鍒嗛厤鐨剅esource緇撴瀯鐨勬寚閽堛?/p> 銆銆3錛?錛? I/O Region鐨勯噴鏀?/p> 銆銆鍑芥暟__release_region()瀹炵幇鍦ㄤ竴涓埗璧勬簮鑺傜偣parent涓噴鏀劇粰瀹氳寖鍥寸殑I/O Region銆傚疄闄呬笂璇ュ嚱鏁扮殑瀹炵幇鎬濇兂涓巁_release_resource()鐩哥被浼箋傚叾婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 p = &parent->child; 聽聽聽聽聽聽聽 for (;;) { 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!res) 聽 銆銆綾諱技鍦幫紝璇ュ嚱鏁頒篃鏄氳繃涓涓猣or寰幆鏉ラ亶鍘嗙埗璧勬簮parent鐨刢hild閾捐〃銆備負姝わ紝瀹冭鎸囬拡res鎸囧悜褰撳墠姝h鎵弿鐨勫瓙璧勬簮鑺傜偣錛屾寚閽坧鎸囧悜鍓嶄竴涓瓙璧勬簮鑺傜偣鐨剆ibling鎴愬憳鍙橀噺錛宲鐨勫垵濮嬪間負鎸囧悜parent->child銆侳or寰幆浣撶殑姝ラ濡備笅錛?/p> 銆銆鈶犺res鎸囬拡鎸囧悜褰撳墠琚壂鎻忕殑瀛愯祫婧愯妭鐐癸紙res錛?p錛夈?/p> 銆銆鈶″鏋渞es鎸囬拡涓篘ULL錛岃鏄庡凡緇忔壂鎻忓畬鏁翠釜child閾捐〃錛屾墍浠ラ鍑篺or寰幆銆?/p> 銆銆鈶㈠鏋渞es鎸囬拡涓嶄負NULL錛屽垯緇х畫鐪嬬湅鎵鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍖哄煙鑼冨洿鏄惁瀹屽叏鍖呭惈鍦ㄥ綋鍓嶈祫婧愯妭鐐逛腑錛屼篃鍗崇湅鐪媅start,start+n-1]鏄惁鍖呭惈鍦╮es->[start,end]涓傚鏋滀笉灞炰簬錛屽垯璁﹑鎸囧悜褰撳墠璧勬簮鑺傜偣鐨剆ibling鎴愬憳錛岀劧鍚庣戶緇璮or寰幆銆傚鏋滃睘浜庯紝鍒欐墽琛屼笅鍒楁楠わ細 銆銆l 鍏堢湅鐪嬪綋鍓嶈祫婧愯妭鐐規槸鍚﹁緗簡IORESOURCE_BUSY鏍囧織浣嶃傚鏋滄病鏈夎緗鏍囧織浣嶏紝鍒欒鏄庤璧勬簮鑺傜偣涓嬮潰鍙兘榪樹細鏈夊瓙鑺傜偣錛屽洜姝ゅ皢鎵弿榪囩▼涓嬮檷涓涓眰嬈★紝浜庢槸淇敼p鎸囬拡錛屼嬌瀹冩寚鍚憆es->child錛岀劧鍚庢墽琛宑ontinue璇彞緇х畫for寰幆銆?/p> 銆銆l 濡傛灉璁劇疆浜咺ORESOURCE_BUSY鏍囧織浣嶃傚垯涓瀹氳紜繚褰撳墠璧勬簮鑺傜偣灝辨槸鎵鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍖哄煙錛岀劧鍚庡皢褰撳墠璧勬簮鑺傜偣浠庡叾鐖惰祫婧愮殑child閾捐〃涓幓闄ゃ傝繖鍙互閫氳繃璁╁墠涓涓厔寮熻祫婧愯妭鐐圭殑sibling鎸囬拡鎸囧悜褰撳墠璧勬簮鑺傜偣鐨勪笅涓涓厔寮熻祫婧愯妭鐐規潵瀹炵幇錛堝嵆璁?p=res->sibling錛夛紝鏈鍚庤皟鐢╧free錛堬級鍑芥暟閲婃斁褰撳墠璧勬簮鑺傜偣鐨剅esource緇撴瀯銆傜劧鍚庡嚱鏁板氨鍙互鎴愬姛榪斿洖浜嗐?/p> 銆銆3錛?錛? 媯鏌ユ寚瀹氱殑I/O Region鏄惁宸茶鍗犵敤 銆銆鍑芥暟__check_region()媯鏌ユ寚瀹氱殑I/O Region鏄惁宸茶鍗犵敤銆傚叾婧愪唬鐮佸涓嬶細 聽聽聽聽聽聽聽 res = __request_region(parent, start, n, "check-region"); 聽聽聽聽聽聽聽 release_resource(res); 聽 銆銆璇ュ嚱鏁扮殑瀹炵幇涓巁_check_resource()鐨勫疄鐜版濇兂綾諱技銆傞鍏堬紝瀹冮氳繃璋冪敤__request_region()鍑芥暟璇曞浘鍦ㄧ埗璧勬簮parent涓垎閰嶆寚瀹氱殑I/O Region銆傚鏋滃垎閰嶄笉鎴愬姛錛屽皢榪斿洖NULL錛屽洜姝ゆ鏃跺嚱鏁拌繑鍥為敊璇鹼紞EBUSY琛ㄧず鎵鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O Region宸茶鍗犵敤銆傚鏋渞es鎸囬拡涓嶄負絀哄垯璇存槑鎵鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O Region娌℃湁琚崰鐢ㄣ備簬鏄皟鐢╛_release_resource()鍑芥暟灝嗗垰鍒氬垎閰嶇殑璧勬簮閲婃斁鎺夛紙瀹為檯涓婃槸灝唕es緇撴瀯浠巔arent鐨刢hild閾捐〃鍘婚櫎錛夛紝鐒跺悗璋冪敤kfree錛堬級鍑芥暟閲婃斁res緇撴瀯鎵鍗犵敤鐨勫唴瀛樸傛渶鍚庯紝榪斿洖0鍊艱〃紺烘寚瀹氱殑I/O Region娌℃湁琚崰鐢ㄣ?/p> 3錛? 綆$悊I/O绔彛璧勬簮 銆銆鎴戜滑閮界煡閬擄紝閲囩敤I/O鏄犲皠鏂瑰紡鐨刋86澶勭悊鍣ㄤ負澶栬瀹炵幇浜嗕竴涓崟鐙殑鍦板潃絀洪棿錛屼篃鍗斥?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O絀洪棿鈥濓紙I/O Space錛夋垨縐頒負鈥?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿鈥濓紝鍏跺ぇ灝忔槸64KB錛?x0000錛?xffff錛夈侺inux鍦ㄥ叾鎵鏀寔鐨勬墍鏈夊鉤鍙頒笂閮藉疄鐜頒簡鈥?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿鈥濊繖涓姒傚康銆?/p> 銆銆鐢變簬I/O絀洪棿闈炲父灝忥紝鍥犳鍗充嬌澶栬鎬葷嚎鏈変竴涓崟鐙殑I/O绔彛絀洪棿錛屽嵈涔熶笉鏄墍鏈夌殑澶栬閮藉皢鍏?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛錛堟寚瀵勫瓨鍣?/b>錛夋槧灝勫埌鈥?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿鈥濅腑銆傛瘮濡傦紝澶у鏁癙CI鍗¢兘閫氳繃鍐呭瓨鏄犲皠鏂瑰紡鏉ュ皢鍏?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛鎴栧璁懼唴瀛樻槧灝勫埌CPU鐨凴AM鐗╃悊鍦板潃絀洪棿涓傝岃佸紡鐨処SA鍗¢氬父灝嗗叾I/O绔彛鏄犲皠鍒?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿涓?/p> 銆銆Linux鏄熀浜庘?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O Region鈥濊繖涓姒傚康鏉ュ疄鐜板I/O绔彛璧勬簮錛?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O錛峬apped 鎴?Memory錛峬apped錛夌殑綆$悊鐨勩?/p> 銆銆3錛?錛? 璧勬簮鏍硅妭鐐圭殑瀹氫箟 銆銆Linux鍦╧ernel/Resource.c鏂囦歡涓畾涔変簡鍏ㄥ眬鍙橀噺ioport_resource鍜宨omem_resource錛屾潵鍒嗗埆鎻忚堪鍩轟簬I/O鏄犲皠鏂瑰紡鐨勬暣涓?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿鍜屽熀浜庡唴瀛樻槧灝勬柟寮忕殑I/O鍐呭瓨璧勬簮絀洪棿錛堝寘鎷?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛鍜屽璁懼唴瀛橈級銆傚叾瀹氫箟濡備笅錛?/p> 聽 銆銆鍏朵腑錛屽畯IO_SPACE_LIMIT琛ㄧず鏁翠釜I/O絀洪棿鐨勫ぇ灝忥紝瀵逛簬X86騫沖彴鑰岃█錛屽畠鏄?xffff錛堝畾涔夊湪include/asm-i386/io.h澶存枃浠朵腑錛夈傛樉鐒訛紝I/O鍐呭瓨絀洪棿鐨勫ぇ灝忔槸4GB銆?/p> 銆銆3錛?錛? 瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿鐨勬搷浣?/p> 銆銆鍩轟簬I/O Region鐨勬搷浣滃嚱鏁癬_XXX_region()錛孡inux鍦ㄥご鏂囦歡include/linux/ioport.h涓畾涔変簡涓変釜瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿榪涜鎿嶄綔鐨勫畯錛氣憼request_region()瀹忥紝璇鋒眰鍦?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿涓垎閰嶆寚瀹氳寖鍥寸殑I/O绔彛璧勬簮銆傗憽check_region()瀹忥紝媯鏌?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛絀洪棿涓殑鎸囧畾I/O绔彛璧勬簮鏄惁宸茶鍗犵敤銆傗憿release_region()瀹忥紝閲婃斁I/O绔彛絀洪棿涓殑鎸囧畾I/O绔彛璧勬簮銆傝繖涓変釜瀹忕殑瀹氫箟濡備笅錛?/p> 聽 銆銆鍏朵腑錛屽畯鍙傛暟start鎸囧畾I/O绔彛璧勬簮鐨勮搗濮嬬墿鐞嗗湴鍧錛堟槸I/O绔彛絀洪棿涓殑鐗╃悊鍦板潃錛夛紝瀹忓弬鏁皀鎸囧畾I/O绔彛璧勬簮鐨勫ぇ灝忋?/p> 銆銆3錛?錛? 瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮鐨勬搷浣?/p> 銆銆鍩轟簬I/O Region鐨勬搷浣滃嚱鏁癬_XXX_region()錛孡inux鍦ㄥご鏂囦歡include/linux/ioport.h涓畾涔変簡涓変釜瀵?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮榪涜鎿嶄綔鐨勫畯錛氣憼request_mem_region()瀹忥紝璇鋒眰鍒嗛厤鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮銆傗憽check_ mem_region()瀹忥紝媯鏌ユ寚瀹氱殑I/O鍐呭瓨璧勬簮鏄惁宸茶鍗犵敤銆傗憿release_ mem_region()瀹忥紝閲婃斁鎸囧畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮銆傝繖涓変釜瀹忕殑瀹氫箟濡備笅錛?/p> 聽 銆銆鍏朵腑錛屽弬鏁皊tart鏄?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮鐨勮搗濮嬬墿鐞嗗湴鍧錛堟槸CPU鐨凴AM鐗╃悊鍦板潃絀洪棿涓殑鐗╃悊鍦板潃錛夛紝鍙傛暟n鎸囧畾I/O鍐呭瓨璧勬簮鐨勫ぇ灝忋?/p> 銆銆3錛?錛? 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Pausing I/O 銆銆瀵逛簬Pausing I/O錛孡inux涔熷湪io.h澶存枃浠朵腑瀹氫箟浜嗗畠鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O璇誨啓鍑芥暟錛岃屼笖閮戒互XXX_p鍛藉悕錛屾瘮濡傦細inb_p()銆乷utb_p()絳夌瓑銆備笅闈㈡垜浠氨浠ut_p()涓轟緥榪涜鍒嗘瀽銆?/p> 銆銆灝唅o.h涓殑瀹忓畾涔塤_OUT(b,鈥漛鈥漜har)灞曞紑鍚庡彲寰楀涓嬪畾涔夛細 extern inline void outb_p(unsigned char value, unsigned short port) { 聽 銆銆鍙互鐪嬪嚭錛宱utb_p()鍑芥暟鐨勫疄鐜頒腑琚彃鍏ヤ簡瀹廮_FULL_SLOWN_DOWN_IO錛屼互瀹炵幇寰皬鐨勫歡鏃躲傚畯__FULL_SLOWN_DOWN_IO鍦ㄥご鏂囦歡io.h涓竴寮濮嬪氨琚畾涔夛細 #ifdef REALLY_SLOW_IO 聽 銆銆鏄劇劧錛宊_FULL_SLOW_DOWN_IO灝辨槸涓涓垨鍥涗釜__SLOW_DOWN_IO錛堟牴鎹槸鍚﹀畾涔変簡瀹廟EALLY_SLOW_IO鏉ュ喅瀹氾級錛岃屽畯__SLOW_DOWN_IO鍒欒瀹氫箟鎴愭鏃犳剰涔夌殑璺寵漿璇彞鎴栧啓绔彛0x80鐨勬搷浣滐紙鏍規嵁鏄惁瀹氫箟浜嗗畯SLOW_IO_BY_JUMPING鏉ュ喅瀹氾級銆?/p> 3錛? 璁塊棶I/O鍐呭瓨璧勬簮 銆銆灝界I/O绔彛絀洪棿鏇句竴搴﹀湪x86騫沖彴涓婅騫挎硾浣跨敤錛屼絾鏄敱浜庡畠闈炲父灝忥紝鍥犳澶у鏁扮幇浠f葷嚎鐨勮澶囬兘浠ュ唴瀛樻槧灝勬柟寮忥紙Memory錛峬apped錛夋潵鏄犲皠瀹冪殑I/O绔彛錛堟寚I/O瀵勫瓨鍣?/b>錛夊拰澶栬鍐呭瓨銆傚熀浜庡唴瀛樻槧灝勬柟寮忕殑I/O绔彛錛堟寚I/O瀵勫瓨鍣?/b>錛夊拰澶栬鍐呭瓨鍙互閫氱О涓衡?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨鈥濊祫婧愶紙I/O Memory錛夈傚洜涓鴻繖涓よ呭湪紜歡瀹炵幇涓婄殑宸紓瀵逛簬杞歡鏉ヨ鏄畬鍏ㄩ忔槑鐨勶紝鎵浠ラ┍鍔ㄧ▼搴忓紑鍙戜漢鍛樺彲浠ュ皢鍐呭瓨鏄犲皠鏂瑰紡鐨?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛鍜屽璁懼唴瀛樼粺涓鐪嬩綔鏄?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨鈥濊祫婧愩?/p> 銆銆浠庡墠鍑犺妭鐨勯槓榪版垜浠煡閬擄紝I/O鍐呭瓨璧勬簮鏄湪CPU鐨勫崟涓鍐呭瓨鐗╃悊鍦板潃絀洪棿鍐呰繘琛岀紪鍧鐨勶紝涔熷嵆瀹冨拰緋葷粺RAM鍚屽鍦ㄤ竴涓墿鐞嗗湴鍧絀洪棿鍐呫傚洜姝ら氳繃CPU鐨勮鍐呮寚浠ゅ氨鍙互璁塊棶I/O鍐呭瓨璧勬簮銆?/p> 銆銆涓鑸潵璇達紝鍦ㄧ郴緇熻繍琛屾椂錛屽璁劇殑I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧鏄凡鐭ョ殑錛岃繖鍙互閫氳繃緋葷粺鍥轟歡錛堝BIOS錛夊湪鍚姩鏃跺垎閰嶅緱鍒幫紝鎴栬呴氳繃璁懼鐨勭‖榪炵嚎錛坔ardwired錛夊緱鍒般傛瘮濡傦紝PCI鍗$殑I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧灝辨槸鍦ㄧ郴緇熷惎鍔ㄦ椂鐢盤CI BIOS鍒嗛厤騫跺啓鍒癙CI鍗$殑閰嶇疆絀洪棿涓殑BAR涓殑銆傝孖SA鍗$殑I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧鍒欐槸閫氳繃璁懼紜繛綰挎槧灝勫埌640KB錛?MB鑼冨洿涔嬪唴鐨勩備絾鏄疌PU閫氬父騫舵病鏈変負榪欎簺宸茬煡鐨勫璁?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧棰勫畾涔夎櫄鎷熷湴鍧鑼冨洿錛屽洜涓哄畠浠槸鍦ㄧ郴緇熷惎鍔ㄥ悗鎵嶅凡鐭ョ殑錛堟煇縐嶆剰涔変笂璁叉槸鍔ㄦ佺殑錛夛紝鎵浠ラ┍鍔ㄧ▼搴忓茍涓嶈兘鐩存帴閫氳繃鐗╃悊鍦板潃璁塊棶I/O鍐呭瓨璧勬簮錛岃屽繀欏誨皢瀹冧滑鏄犲皠鍒版牳蹇冭櫄鍦板潃絀洪棿鍐咃紙閫氳繃欏佃〃錛夛紝鐒跺悗鎵嶈兘鏍規嵁鏄犲皠鎵寰楀埌鐨勬牳蹇冭櫄鍦板潃鑼冨洿錛岄氳繃璁垮唴鎸囦護璁塊棶榪欎簺I/O鍐呭瓨璧勬簮銆?/p> 銆銆3錛?錛? 鏄犲皠I/O鍐呭瓨璧勬簮 銆銆Linux鍦╥o.h澶存枃浠朵腑澹版槑浜嗗嚱鏁癷oremap錛堬級錛岀敤鏉ュ皢I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧鏄犲皠鍒版牳蹇冭櫄鍦板潃絀洪棿錛?GB錛?GB錛変腑錛屽涓嬶細 聽 銆銆鍑芥暟鐢ㄤ簬鍙栨秷ioremap錛堬級鎵鍋氱殑鏄犲皠錛屽弬鏁癮ddr鏄寚鍚戞牳蹇冭櫄鍦板潃鐨勬寚閽堛傝繖涓や釜鍑芥暟閮芥槸瀹炵幇鍦╩m/ioremap.c鏂囦歡涓傚叿浣撳疄鐜板彲鍙傝冦婃儏鏅垎鏋愩嬩竴涔︺?/p> 銆銆3錛?錛? 璇誨啓I/O鍐呭瓨璧勬簮 銆銆鍦ㄥ皢I/O鍐呭瓨璧勬簮鐨勭墿鐞嗗湴鍧鏄犲皠鎴愭牳蹇冭櫄鍦板潃鍚庯紝鐞嗚涓婅鎴戜滑灝卞彲浠ヨ薄璇誨啓RAM閭f牱鐩存帴璇誨啓I/O鍐呭瓨璧勬簮浜嗐備絾鏄紝鐢變簬鍦ㄦ煇浜涘鉤鍙頒笂錛屽I/O鍐呭瓨鍜岀郴緇熷唴瀛樻湁涓嶅悓鐨勮闂鐞嗭紝鍥犳涓轟簡紜繚璺ㄥ鉤鍙扮殑鍏煎鎬э紝Linux瀹炵幇浜嗕竴緋誨垪璇誨啓I/O鍐呭瓨璧勬簮鐨勫嚱鏁幫紝榪欎簺鍑芥暟鍦ㄤ笉鍚岀殑騫沖彴涓婃湁涓嶅悓鐨勫疄鐜般備絾鍦▁86騫沖彴涓婏紝璇誨啓I/O鍐呭瓨涓庤鍐橰AM鏃犱換浣曞樊鍒傚涓嬫墍紺猴紙include/asm-i386/io.h錛夛細 #define writeb(b,addr) (*(volatile unsigned char *) __io_virt(addr) = (b)) #define memset_io(a,b,c)聽聽聽聽聽聽聽 memset(__io_virt(a),(b),(c)) 銆銆涓婅堪瀹氫箟涓殑瀹廮_io_virt()浠呬粎媯鏌ヨ櫄鍦板潃addr鏄惁鏄牳蹇冪┖闂翠腑鐨勮櫄鍦板潃銆傝瀹忓湪鍐呮牳2.4.0涓殑瀹炵幇鏄復鏃舵х殑銆傚叿浣撶殑瀹炵幇鍑芥暟鍦╝rch/i386/lib/Iodebug.c鏂囦歡銆?/p> 銆銆鏄劇劧錛屽湪x86騫沖彴涓婅闂?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O鍐呭瓨璧勬簮涓庤闂郴緇熶富瀛楻AM鏄棤宸埆鐨勩備絾鏄負浜嗕繚璇侀┍鍔ㄧ▼搴忕殑璺ㄥ鉤鍙扮殑鍙Щ妞嶆э紝鎴戜滑搴旇浣跨敤涓婇潰鐨勫嚱鏁版潵璁塊棶I/O鍐呭瓨璧勬簮錛岃屼笉搴旇閫氳繃鎸囧悜鏍稿績铏氬湴鍧鐨勬寚閽堟潵璁塊棶銆?/p>
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鍏抽敭璇?/strong>錛歅CI鎬葷嚎 閰嶇疆絀洪棿 鎿嶄綔緋葷粺
杞嚜錛?a >http://topdzh.byethost4.com/viewthread.php?tid=48&extra=page%3D1
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錛?錛塒CI鍩哄湴鍧錛圥CI Base Address錛夛紝閰嶇疆絀洪棿鍋忕Щ閲忎負10锝?4h錛岃澶囬氳繃璁懼畾鍙鍐欑殑楂樹綅鏁板兼潵鍚戞搷浣滅郴緇熸寚紺烘墍闇璧勬簮絀洪棿鐨勫ぇ灝忋傛瘮濡傦紝鏌愯澶囬渶瑕?4K瀛楄妭鐨勫唴瀛?絀洪棿錛屽彲浠ュ皢閰嶇疆絀洪棿鐨勬煇鍩哄湴鍧瀵勫瓨鍣ㄧ殑楂?6浣嶈鎴愬彲璇誨啓鐨勶紝鑰屽皢浣?6浣嶇疆涓?錛堝彧鍙錛夈傛搷浣滅郴緇熷湪寤虹珛鏃訛紝鍏堝悜鎵鏈変綅鍐?錛屽疄闄呬笂鍙湁楂?6浣嶈 鎺ユ敹鑰岃緗垚浜?錛屼綆16浣嶄粛涓?.榪欐牱鎿嶄綔緋葷粺璇誨彇璇ュ瘎瀛樺櫒鏃訛紝榪斿洖鍊間負FFFF0000h錛屾嵁姝ゆ搷浣滅郴緇熷彲浠ユ柇瀹氬叾闇瑕佺殑絀洪棿澶у皬鏄?4K瀛楄妭錛岀劧鍚?鍒嗛厤涓孌電┖闂茬殑鍐呭瓨絀洪棿騫跺悜璇ュ瘎瀛樺櫒鐨勯珮16浣嶅~鍐欏叾鍦板潃銆?br />
鍏跺畠鍙兘涓庣紪紼嬫湁鍏崇殑閰嶇疆絀洪棿鐨勫畾涔夊強鍦板潃璇峰弬闃呭弬鑰冩枃鐚甗1]銆?br />
鐢變簬PC-AT鍏煎緋葷粺CPU鍙湁鍐呭瓨鍜孖/O涓ょ絀洪棿錛屾病鏈変笓鐢ㄧ殑閰嶇疆絀洪棿錛孭CI鍗忚瑙勫畾鍒╃敤鐗瑰畾鐨処/O絀洪棿鎿嶄綔椹卞姩PCI妗ヨ礬杞崲鎴愰厤緗┖闂寸殑鎿?浣溿傜洰鍓嶅瓨鍦ㄤ袱縐嶈漿鎹㈡満鍒訛紝鍗抽厤緗満鍒?#鍜岄厤緗満鍒?#銆傞厤緗満鍒?#鍦ㄦ柊鐨勮璁′腑灝嗕笉鍐嶈閲囩敤錛屾柊鐨勮璁″簲浣跨敤閰嶇疆鏈哄埗1#鏉ヤ駭鐢熼厤緗┖闂寸殑鐗╃悊鎿?浣溿傝繖縐嶆満鍒朵嬌鐢ㄤ簡涓や釜鐗瑰畾鐨?2浣岻/O絀洪棿錛屽嵆CF8h鍜孋FCh銆傝繖涓や釜絀洪棿瀵瑰簲浜嶱CI妗ヨ礬鐨勪袱涓瘎瀛樺櫒錛屽綋妗ヨ礬鐪嬪埌CPU鍦ㄥ眬閮ㄦ葷嚎瀵硅繖涓や釜 I/O絀洪棿榪涜鍙屽瓧鎿嶄綔鏃訛紝灝卞皢璇/O鎿嶄綔杞彉涓篜CI鎬葷嚎鐨勯厤緗搷浣溿傚瘎瀛樺櫒CF8h鐢ㄤ簬浜х敓閰嶇疆絀洪棿鐨勫湴鍧錛圕ONFIG-ADDRESS錛夛紝瀵勫瓨 鍣–FCh鐢ㄤ簬淇濆瓨閰嶇疆絀洪棿鐨勮鍐欐暟鎹紙CONFIG-DATA錛夈?br />
閰嶇疆絀洪棿鍦板潃瀵勫瓨鍣ㄧ殑鏍煎紡濡傚浘1銆?br />
CF8H錛堝眬閮ㄦ葷嚎錛夛細
褰揅PU鍙戝嚭瀵笽/O絀洪棿CFCh鐨勬搷浣滄椂錛孭CI妗ヨ礬灝嗘鏌ラ厤緗┖闂村湴鍧瀵勫瓨鍣–F8h鐨?1浣嶃傚鏋滀負1錛屽氨鍦≒CI鎬葷嚎涓婁駭鐢熶竴涓浉搴旂殑閰嶇疆絀洪棿璇繪垨鍐欐搷浣滐紝鍏跺湴鍧鐢盤CI妗ヨ礬鏍規嵁閰嶇疆絀洪棿鍦板潃瀵勫瓨鍣ㄧ殑鍐呭浣滃鍥?鎵紺虹殑杞崲銆?br />
CFCh (灞閮ㄦ葷嚎)錛?br />
璁懼鍙瘋PCI妗ヨ礬璇戠爜浜х敓PCI鎬葷嚎鍦板潃鐨勯珮浣嶅湴鍧錛屽畠浠璁捐鑰呯敤浣淚DSEL淇″彿鏉ュ尯鍒嗙浉搴旂殑PCI璁懼銆?浣嶅瘎瀛樺櫒鍙風敤浜庡鍧璇CI璁懼閰嶇疆絀?闂?2涓弻瀛楃殑閰嶇疆瀵勫瓨鍣紙256瀛楄妭錛夈傚姛鑳藉彿鐢ㄤ簬鍖哄垎澶氬姛鑳借澶囩殑鏌愮壒瀹氬姛鑳界殑閰嶇疆絀洪棿錛屽甯哥敤鐨勫崟鍔熻兘璁懼涓?00銆傛煇涓璓CI鎻掓Ы鐨勬葷嚎鍙烽殢緋葷粺 錛堜富鏉匡級鐨勪笉鍚岀◢鏈夊尯鍒紝澶у鏁癙C鏈轟負1錛屽伐鎺ф満鍙兘涓?鎴?銆備負浜嗘壘鍒版煇璁懼錛屽簲鍦ㄧ郴緇熺殑鍚勪釜鎬葷嚎鍙蜂笂鏌ユ壘錛岀洿鍒板畾浣嶃傚鏋滃湪0锝?鍙鋒葷嚎涓婁笉鑳藉彂鐜?璇ヨ澶囷紝鍗沖彲璁や負璇ヨ澶囦笉瀛樺湪銆?br />
鐞嗚В浜嗕笂榪癙CI鍗忚閲岀殑閰嶇疆鏈哄埗鍚庯紝灝卞彲浠ョ洿鎺ュCF8h鍜孋FCh涓や釜鍙屽瓧鐨処/O絀洪棿榪涜鎿嶄綔錛屾煡鎵炬煇涓狿CI璁懼騫惰闂叾閰嶇疆絀洪棿錛屼粠鑰屽緱鍒版搷浣滅郴緇熷璇CI璁懼鐨勮祫婧愬垎閰嶃?br />
2 鐢↖/O鍛戒護璁塊棶PCI鎬葷嚎閰嶇疆絀洪棿
瑕佽闂甈CI鎬葷嚎璁懼鐨勯厤緗┖闂達紝蹇呴』鍏堟煡鎵捐璁懼銆傛煡鎵劇殑鍩烘湰鏍規嵁鏄悇PCI璁懼鐨勯厤緗┖闂撮噷閮藉瓨鏈夌壒瀹氱殑璁懼鍙鳳紙Device ID錛夊強閿鍞晢鍙鳳紙Vendor ID錛夛紝瀹冧滑鍗犵敤閰嶇疆絀洪棿鐨?0h鍦板潃銆傝屾煡鎵劇殑鐩殑鏄幏寰楄璁懼鐨勬葷嚎鍙峰拰璁懼鍙楓傛煡鎵劇殑鍩烘湰榪囩▼濡備笅錛氱敤I/O鍛戒護鍐欓厤緗┖闂寸殑鍦板潃瀵勫瓨鍣–F8h錛?浣垮叾鏈楂樹綅涓?錛屾葷嚎鍙峰強璁懼涓?錛屽姛鑳藉彿鍙婂瘎瀛樺櫒鍙蜂負0錛屽嵆寰I/O绔彛CF8h80000000h錛涚劧鍚庣敤I/O鍛戒護璇誨彇閰嶇疆絀洪棿鐨勬暟鎹瘎瀛樺櫒 CFCh銆傚鏋滆瀵勫瓨鍣ㄥ間笌璇CI璁懼鐨凞evice ID鍙奦endor ID涓嶇浉絎︼紝鍒欎緷嬈¢掑璁懼鍙?鎬葷嚎鍙鳳紝閲嶅涓婅堪鎿嶄綔鐩村埌鎵懼埌璇ヨ澶囦負姝€傚鏋滄煡瀹屾墍鏈夌殑璁懼鍙?鎬葷嚎鍙鳳紙1锝?錛変粛涓嶈兘鎵懼埌璇ヨ澶囷紝鍒欏簲褰撹冭檻紜歡涓婄殑 闂銆傚浜庡鍔熻兘璁懼錛屽彧瑕佽澶囬厤緗瘎瀛樺櫒鐩稿簲鐨勫姛鑳藉彿鍊鹼紝鍏朵綑姝ラ涓庡崟鍔熻兘璁懼涓鏍楓?br />
濡傛煡鎵捐澶囧彿涓?054h錛岄攢鍞晢鍙蜂負10b5鐨勫崟鍔熻兘PCI璁懼錛岀紪鍐欑殑紼嬪簭濡備笅錛?br />
unsigned int ioa0,iod;
int scan( )
{
bus=0;device=0;
for(char i=0;i<5;i++) {
for(char j=0;j<32;j++) {
bus=i; device=j;
ioa0=0x80000000+bus*0x10000
+(device*8)*0x100;
_outpd(0xcf8,ioa0);
iod=_inpd(0xcfc);
if (iod0= =0x905410b5) return 0;
}
}
retrn -1
}
unsigned int memaddr1,memaddr2;
unsigned int iobase,ioa;
void getbaseaddr(char bus,char device);
{
iobase=0x80000000+bus*0x10000+(device*8)*0x100;
ioa=iobase+0x10;/*瀵誨潃鍩哄湴鍧瀵勫瓨鍣?*/
_outpd(0xcf8,ioa);
ioaddr1=(unsigned short)_inpd(0xcfc)&0xfffc;
/*灞忚斀浣庝袱浣嶅拰楂?6浣?/
ioa=iobase+0x14; /*瀵誨潃鍩哄湴鍧瀵勫瓨鍣?*/
_outpd(0xcf8,ioa);
ioaddr2=(unsigned short)_inpd(0xcfc)&0xfffc;
ioa=iobase+0x18;/*瀵誨潃鍩哄湴瀵勫瓨鍣?*/
_outpd(0xcf8,ioa);
memaddr1=_inpd(0xcfc) & 0xfffffff0;
/*灞忚斀浣?浣?/
ioa=iobase+0x1c; /*瀵誨潃鍩哄湴鍧瀵勫瓨鍣?*/
_outpd(0xcf8,ioa);
memaddr2=_inpd(0xcfc) & 0xfffffff0;
}
涓婅堪紼嬪簭緇欏嚭浜嗚鍙栭厤緗┖闂撮噷鐨勫熀鍦板潃鐨勬柟娉曘傚彟鏈夌浉褰撳PCI璁懼閫氳繃閰嶇疆絀洪棿鐨勮澶囧叧鑱斿尯鏉ヨ緗璁懼鐨勫伐浣滅姸鎬侊紝鍙交鏄撳湴鐢↖/O鍛戒護榪涜鐩稿簲鐨勮緗紝鏃犻』緙栧啓綣佹潅鐨勯┍鍔ㄧ▼搴忋傚湪寮鍙慞CI瑙嗛鍥懼儚閲囬泦鍗$殑榪囩▼涓紝璇ユ柟娉曞緱鍒頒簡瀹為檯搴旂敤銆?br />
]]>
銆銆struct resource {
聽聽聽聽聽聽聽 const char *name;
聽聽聽聽聽聽聽 unsigned long start, end;
聽聽聽聽聽聽聽 unsigned long flags;
聽聽聽聽聽聽聽 struct resource *parent, *sibling, *child;
銆銆};
/*
* IO resources have these defined flags.
*/
#define IORESOURCE_BITS聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x000000ff聽聽聽聽聽聽聽 /* Bus-specific bits */
#define IORESOURCE_MEM聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x00000200
#define IORESOURCE_IRQ聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x00000400
#define IORESOURCE_DMA聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x00000800
#define IORESOURCE_READONLY聽聽聽聽聽聽聽 0x00002000
#define IORESOURCE_CACHEABLE聽聽聽聽聽聽聽 0x00004000
#define IORESOURCE_RANGELENGTH聽聽聽聽聽聽聽 0x00008000
#define IORESOURCE_SHADOWABLE聽聽聽聽聽聽聽 0x00010000
#define IORESOURCE_BUS_HAS_VGA聽聽聽聽聽聽聽 0x00080000
#define IORESOURCE_AUTO聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x40000000
#define IORESOURCE_BUSY聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 0x80000000
聽聽聽聽聽聽聽 /* Driver has marked this resource busy */
銆銆int request_resource(struct resource *root, struct resource *new)
銆銆{
聽聽聽聽聽聽聽 struct resource *conflict;
聽聽聽聽聽聽聽 conflict = __request_resource(root, new);
聽聽聽聽聽聽聽 write_unlock(&resource_lock);
聽聽聽聽聽聽聽 return conflict ? -EBUSY : 0;
銆銆}
錛坘ernel/Resource.c錛夛細
/* Return the conflict entry if you can't request it */
static struct resource * __request_resource
銆銆(struct resource *root, struct resource *new)
{
聽聽聽聽聽聽聽 unsigned long start = new->start;
聽聽聽聽聽聽聽 unsigned long end = new->end;
聽聽聽聽聽聽聽 struct resource *tmp, **p;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return root;
聽聽聽聽聽聽聽 if (start < root->start)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return root;
聽聽聽聽聽聽聽 if (end > root->end)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return root;
聽聽聽聽聽聽聽 p = &root->child;
聽聽聽聽聽聽聽 for (;;) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 tmp = *p;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!tmp || tmp->start > end) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->sibling = tmp;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 *p = new;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->parent = root;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return NULL;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 p = &tmp->sibling;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (tmp->end < start)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 continue;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return tmp;
聽聽聽聽聽聽聽 }
}
int release_resource(struct resource *old)
{
聽聽聽聽聽聽聽 int retval;
聽聽聽聽聽聽聽 retval = __release_resource(old);
聽聽聽聽聽聽聽 write_unlock(&resource_lock);
聽聽聽聽聽聽聽 return retval;
}
static int __release_resource(struct resource *old)
{
聽聽聽聽聽聽聽 struct resource *tmp, **p;
聽聽聽聽聽聽聽 for (;;) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 tmp = *p;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!tmp)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (tmp == old) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 *p = tmp->sibling;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 old->parent = NULL;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return 0;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 p = &tmp->sibling;
聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 return -EINVAL;
}
int check_resource(struct resource *root, unsigned long start, unsigned long len)
{
聽聽聽聽聽聽聽 struct resource *conflict, tmp;
聽聽聽聽聽聽聽 tmp.end = start + len - 1;
聽聽聽聽聽聽聽 write_lock(&resource_lock);
聽聽聽聽聽聽聽 conflict = __request_resource(root, &tmp);
聽聽聽聽聽聽聽 if (!conflict)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 __release_resource(&tmp);
聽聽聽聽聽聽聽 write_unlock(&resource_lock);
聽聽聽聽聽聽聽 return conflict ? -EBUSY : 0;
}
/*
* Find empty slot in the resource tree given range and alignment.
*/
static int find_resource(struct resource *root, struct resource *new,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽 unsigned long size,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽 unsigned long min, unsigned long max,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽 unsigned long align,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽 void (*alignf)(void *, struct resource *, unsigned long),
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽 void *alignf_data)
{
聽聽聽聽聽聽聽 struct resource *this = root->child;
聽聽聽聽聽聽聽 for(;;) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (this)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->end = this->start;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 else
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->end = root->end;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (new->start < min)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->start = min;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (new->end > max)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->end = max;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->start = (new->start + align - 1) & ~(align - 1);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (alignf)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 alignf(alignf_data, new, size);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (new->start < new->end && new->end - new->start + 1 >= size)
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽 {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->end = new->start + size - 1;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return 0;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!this)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 new->start = this->end + 1;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 this = this->sibling;
聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 return -EBUSY;
}
/*
* Allocate empty slot in the resource tree given range and alignment.
*/
int allocate_resource(struct resource *root, struct resource *new,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽 unsigned long size,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽 unsigned long min, unsigned long max,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽 unsigned long align,
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽 void (*alignf)(void *, struct resource *, unsigned long),
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽 void *alignf_data)
{
聽聽聽 int err;
聽聽聽 err = find_resource(root, new, size, min, max, align, alignf, alignf_data);
聽聽聽 if (err >= 0 && __request_resource(root, new))
聽聽聽聽聽聽聽 err = -EBUSY;
聽聽聽 write_unlock(&resource_lock);
聽聽聽 return err;
}
int get_resource_list(struct resource *root, char *buf, int size)
{
聽聽聽聽聽聽聽 char *fmt;
聽聽聽聽聽聽聽 int retval;
";
聽聽聽聽聽聽聽 if (root->end < 0x10000)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 fmt = "聽聽聽聽聽聽聽 %04lx-%04lx : %s
";
聽聽聽聽聽聽聽 read_lock(&resource_lock);
聽聽聽聽聽聽聽 retval = do_resource_list(root->child, fmt, 8, buf, buf + size) - buf;
聽聽聽聽聽聽聽 read_unlock(&resource_lock);
聽聽聽聽聽聽聽 return retval;
}
/*
* This generates reports for /proc/ioports and /proc/iomem
*/
static char * do_resource_list(struct resource *entry, const char *fmt,
銆銆int offset, char *buf, char *end)
{
聽聽聽聽聽聽聽 if (offset < 0)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 offset = 0;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 const char *name = entry->name;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 unsigned long from, to;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return buf;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 to = entry->end;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!name)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 name = "";
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (entry->child)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽 buf = do_resource_list(entry->child, fmt, offset-2, buf, end);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 entry = entry->sibling;
聽聽聽聽聽聽聽 }
}
struct resource * __request_region(struct resource *parent,
銆銆unsigned long start, unsigned long n, const char *name)
{
聽聽聽聽聽聽聽 struct resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 memset(res, 0, sizeof(*res));
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 res->name = name;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 res->start = start;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 res->end = start + n - 1;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 res->flags = IORESOURCE_BUSY;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 struct resource *conflict;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!conflict)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (conflict != parent) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 parent = conflict;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!(conflict->flags & IORESOURCE_BUSY))
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 continue;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 kfree(res);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 res = NULL;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 write_unlock(&resource_lock);
聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 return res;
}
void __release_region(struct resource *parent,
銆銆銆銆unsigned long start, unsigned long n)
{
聽聽聽聽聽聽聽 struct resource **p;
聽聽聽聽聽聽聽 unsigned long end;
聽聽聽聽聽聽聽 end = start + n - 1;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 struct resource *res = *p;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (res->start <= start && res->end >= end) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (!(res->flags & IORESOURCE_BUSY)) {
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 p = &res->child;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 continue;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 if (res->start != start'聽 'res->end != end)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 break;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 *p = res->sibling;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 kfree(res);
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return;
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 p = &res->sibling;
聽聽聽聽聽聽聽 }
聽聽聽聽聽聽聽 printk("Trying to free nonexistent resource <%08lx-%08lx>
", start, end);
}
int __check_region(struct resource *parent, unsigned long start, unsigned long n)
{
聽聽聽聽聽聽聽 struct resource * res;
聽聽聽聽聽聽聽 if (!res)
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 return -EBUSY;
聽聽聽聽聽聽聽 kfree(res);
聽聽聽聽聽聽聽 return 0;
}
struct resource ioport_resource =
銆銆銆銆{ "PCI IO", 0x0000, IO_SPACE_LIMIT, IORESOURCE_IO };
struct resource iomem_resource =
銆銆銆銆{ "PCI mem", 0x00000000, 0xffffffff, IORESOURCE_MEM };
#define request_region(start,n,name)
聽聽聽聽聽聽聽 __request_region(&ioport_resource, (start), (n), (name))
#define check_region(start,n)
聽聽聽聽聽聽聽 __check_region(&ioport_resource, (start), (n))
#define release_region(start,n)
聽聽聽聽聽聽聽 __release_region(&ioport_resource, (start), (n))
#define request_mem_region(start,n,name)
銆銆__request_region(&iomem_resource, (start), (n), (name))
#define check_mem_region(start,n)
聽聽聽聽聽聽聽 __check_region(&iomem_resource, (start), (n))
#define release_mem_region(start,n)
聽聽聽聽聽聽聽 __release_region(&iomem_resource, (start), (n))
#define get_ioport_list(buf) get_resource_list(&ioport_resource, buf, PAGE_SIZE)
#define get_mem_list(buf)聽聽聽聽聽聽聽 get_resource_list(&iomem_resource, buf, PAGE_SIZE)
銆銆unsigned char inb錛坲nsigned port錛夛紱
銆銆void outb錛坲nsigned char value錛寀nsigned port錛夛紱
銆銆unsigned short inw錛坲nsigned port錛夛紱
銆銆void outw錛坲nsigned short value錛寀nsigned port錛夛紱
銆銆unsigned int inl錛坲nsigned port錛夛紱
銆銆void outl錛坲nsigned int value錛寀nsigned port錛夛紱
銆銆void insb錛坲nsigned port錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆void outsb錛坲nsigned port 錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆void insw錛坲nsigned port錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆void outsw錛坲nsigned port 錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆void insl錛坲nsigned port錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆void outsl錛坲nsigned port 錛寁oid * addr錛寀nsigned long count錛夛紱
銆銆鍦ㄤ竴浜涘鉤鍙頒笂錛堝吀鍨嬪湴濡俋86錛夛紝瀵逛簬鑰佸紡鎬葷嚎錛堝ISA錛変笂鐨勬參閫熷璁炬潵璇達紝濡傛灉CPU璇誨啓鍏?b style="COLOR: black; BACKGROUND-COLOR: #99ff99">I/O绔彛鐨勯熷害澶揩錛岄偅灝卞彲鑳戒細鍙戠敓涓㈠け鏁版嵁鐨勭幇璞°傚浜庤繖涓棶棰樼殑瑙e喅鏂規硶灝辨槸鍦ㄤ袱嬈¤繛緇殑I/O鎿嶄綔涔嬮棿鎻掑叆涓孌靛井灝忕殑鏃跺歡錛屼互渚跨瓑寰呮參閫熷璁俱傝繖灝辨槸鎵璋撶殑鈥淧ausing I/O鈥濄?/p>
extern inline void outb(unsigned char value, unsigned short port) {
聽聽聽聽聽聽聽 __asm__ __volatile__ ("outb %" "b " "0,%" "w" "1"
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 : : "a" (value), "Nd" (port));
}
聽聽聽聽聽聽聽 __asm__ __volatile__ ("outb %" "b " "0,%" "w" "1"
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 __FULL_SLOW_DOWN_IO
聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 聽聽聽聽聽聽聽 : : "a" (value), "Nd" (port));
}
#ifdef SLOW_IO_BY_JUMPING
#define __SLOW_DOWN_IO "
jmp 1f
1:聽聽聽聽聽聽聽 jmp 1f
1:"
#else
#define __SLOW_DOWN_IO "
outb %%al,$0x80"
#endif
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
銆銆__SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO
#else
#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO
#endif
void * ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags);
void iounmap(void * addr);
#define readb(addr) (*(volatile unsigned char *) __io_virt(addr))
#define readw(addr) (*(volatile unsigned short *) __io_virt(addr))
#define readl(addr) (*(volatile unsigned int *) __io_virt(addr))
#define writew(b,addr) (*(volatile unsigned short *) __io_virt(addr) = (b))
#define writel(b,addr) (*(volatile unsigned int *) __io_virt(addr) = (b))
#define memcpy_fromio(a,b,c) memcpy((a),__io_virt(b),(c))
#define memcpy_toio(a,b,c)聽聽聽聽聽聽聽 memcpy(__io_virt(a),(b),(c))
浣滆?br />Bharata聽B.聽Rao
IBM聽Linux聽鎶鏈腑蹇冿紝IBM聽杞歡瀹為獙瀹わ紝鍗板害
2001聽騫綽?聽鏈埪?br />
Bharata聽B.聽Rao聽鎻愪緵浜嗗湪聽Linux聽騫沖彴涓婁嬌鐢ㄥ拰鏋勯犅爔86聽鍐呰仈姹囩紪鐨勬鎷т粙緇嶃備粬浠嬬粛浜嗗唴鑱旀眹緙栧強鍏跺悇縐嶇敤娉曠殑鍩虹鐭ヨ瘑錛屾彁渚涗簡涓浜涘熀鏈殑鍐呰仈姹囩紪緙栫爜鎸囧錛屽茍瑙i噴浜嗗湪聽Linux聽鍐呮牳涓唴鑱旀眹緙栦唬鐮佺殑涓浜涘疄渚嬨?br />濡傛灉鎮ㄦ槸聽Linux聽鍐呮牳鐨勫紑鍙戜漢鍛橈紝鎮ㄤ細鍙戠幇鑷繁緇忓父瑕佸涓庝綋緋葷粨鏋勯珮搴︾浉鍏崇殑鍔熻兘榪涜緙栫爜鎴栦紭鍖栦唬鐮佽礬寰勩傛偍寰堝彲鑳芥槸閫氳繃灝嗘眹緙栬璦鎸囦護鎻掑叆鍒奧燙聽璇彞鐨勪腑闂達紙鍙堢О涓哄唴鑱旀眹緙栫殑涓縐嶆柟娉曪級鏉ユ墽琛岃繖浜涗換鍔$殑銆傝鎴戜滑鐪嬩竴涓嬄燣inux聽涓唴鑱旀眹緙栫殑鐗瑰畾鐢ㄦ硶銆傦紙鎴戜滑灝嗚璁洪檺鍒跺湪聽IA32聽姹囩紪銆傦級
GNU聽姹囩紪紼嬪簭綆榪?br />璁╂垜浠鍏堢湅涓涓嬄燣inux聽涓嬌鐢ㄧ殑鍩烘湰姹囩紪紼嬪簭璇硶銆侴CC錛堢敤浜幝燣inux聽鐨劼燝NU聽C聽緙栬瘧鍣級浣跨敤聽AT&T聽姹囩紪璇硶銆備笅闈㈠垪鍑轟簡榪欑璇硶鐨勪竴浜涘熀鏈鍒欍傦紙璇ュ垪琛ㄨ偗瀹氫笉瀹屾暣錛涘彧鍖呮嫭浜嗕笌鍐呰仈姹囩紪鐩稿叧鐨勯偅浜涜鍒欍傦級
瀵勫瓨鍣?/b>鍛藉悕聽
瀵勫瓨鍣?/b>鍚嶇О鏈壜?聽鍓嶇紑銆傚嵆錛屽鏋滃繀欏諱嬌鐢爀ax錛屽畠搴旇鐢ㄤ綔聽%eax銆偮?br />
婧愭搷浣滄暟鍜岀洰鐨勬搷浣滄暟鐨勯『搴徛?br />鍦ㄦ墍鏈夋寚浠や腑錛屽厛鏄簮鎿嶄綔鏁幫紝鐒跺悗鎵嶆槸鐩殑鎿嶄綔鏁般傝繖涓庡皢婧愭搷浣滄暟鏀懼湪鐩殑鎿嶄綔鏁頒箣鍚庣殑聽Intel聽璇硶涓嶅悓銆偮?br />
mov聽%eax,聽%ebx,聽transfers聽the聽contents聽of聽eax聽to聽ebx.
聽
鎿嶄綔鏁板ぇ灝徛?br />鏍規嵁鎿嶄綔鏁版槸瀛楄妭聽(byte)銆佸瓧聽(word)聽榪樻槸闀垮瀷聽(long)錛屾寚浠ょ殑鍚庣紑鍙互鏄燽銆亀聽鎴柭爈銆傝繖騫朵笉鏄己鍒舵х殑錛汫CC聽浼氬皾璇曢氳繃璇誨彇鎿嶄綔鏁版潵鎻愪緵鐩稿簲鐨勫悗緙銆備絾鎵嬪伐鎸囧畾鍚庣紑鍙互鏀瑰杽浠g爜鐨勫彲璇繪э紝騫跺彲浠ユ秷闄ょ紪璇戝櫒鐚滄祴涓嶆紜殑鍙兘鎬с偮?br />
movb聽%al,聽%bl聽--聽Byte聽move
聽聽聽聽movw聽%ax,聽%bx聽--聽Word聽move
聽聽聽聽movl聽%eax,聽%ebx聽--聽Longword聽move
聽
绔嬪嵆鎿嶄綔鏁奧?br />閫氳繃浣跨敤聽錛劼犳寚瀹氱洿鎺ユ搷浣滄暟銆偮?br />
movl聽錛?xffff,聽%eax聽--聽will聽move聽the聽value聽of聽0xffff聽into聽eax聽register.
聽
闂存帴鍐呭瓨寮曠敤聽
浠諱綍瀵瑰唴瀛樼殑闂存帴寮曠敤閮芥槸閫氳繃浣跨敤聽(聽聽鏉ュ畬鎴愮殑銆偮?br />
movb聽(%esi),聽%al聽--聽will聽transfer聽the聽byte聽in聽the聽memory聽
聽pointed聽by聽esi聽into聽al
register
聽
鍐呰仈姹囩紪
GCC聽涓哄唴鑱旀眹緙栨彁渚涚壒孌婄粨鏋勶紝瀹冨叿鏈変互涓嬫牸寮忥細
GCG聽鐨劼?asm"聽緇撴瀯聽
聽聽聽asm聽(聽assembler聽template
聽聽聽聽
:聽output聽operands聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽(optional)
聽聽聽聽
:聽input聽operands聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽(optional)
聽聽聽聽
:聽list聽of聽clobbered聽registers聽聽聽
聽聽聽聽(optional)
聽聽聽聽
);聽聽
聽
鏈緥涓紝姹囩紪紼嬪簭妯℃澘鐢辨眹緙栨寚浠ょ粍鎴愩傝緭鍏ユ搷浣滄暟鏄厖褰撴寚浠よ緭鍏ユ搷浣滄暟浣跨敤鐨劼燙聽琛ㄨ揪寮忋傝緭鍑烘搷浣滄暟鏄皢瀵瑰叾鎵ц姹囩紪鎸囦護杈撳嚭鐨劼燙聽琛ㄨ揪寮忋?br />
鍐呰仈姹囩紪鐨勯噸瑕佹т綋鐜板湪瀹冭兘澶熺伒媧繪搷浣滐紝鑰屼笖鍙互浣垮叾杈撳嚭閫氳繃聽C聽鍙橀噺鏄劇ず鍑烘潵銆傚洜涓哄畠鍏鋒湁榪欑鑳藉姏錛屾墍浠ヂ?asm"聽鍙互鐢ㄤ綔姹囩紪鎸囦護鍜屽寘鍚畠鐨劼燙聽紼嬪簭涔嬮棿鐨勬帴鍙c?br />
涓涓潪甯稿熀鏈絾寰堥噸瑕佺殑鍖哄埆鍦ㄤ簬聽綆鍗曞唴鑱旀眹緙栧彧鍖呮嫭鎸囦護錛岃屄犳墿灞曞唴鑱旀眹緙栧寘鎷搷浣滄暟銆傝璇存槑榪欎竴鐐癸紝鑰冭檻浠ヤ笅紺轟緥錛毬?br />
鍐呰仈姹囩紪鐨勫熀鏈绱犅?br />
{
聽聽聽聽int聽a=10,聽b;
聽聽聽聽asm聽("movl聽%1,聽%%eax;
聽聽聽聽
movl聽%%eax,聽%0;"
聽聽聽聽聽聽聽聽:"=r"(b)聽聽/*聽output聽*/聽聽聽聽
聽聽聽聽聽聽聽聽:"r"(a)聽聽聽聽聽聽聽/*聽input聽*/
聽聽聽聽聽聽聽聽:"%eax";聽/*聽clobbered聽register聽*/
}
聽
鍦ㄤ笂渚嬩腑錛屾垜浠嬌鐢ㄦ眹緙栨寚浠や嬌聽"b"聽鐨勫肩瓑浜幝?a"銆傝娉ㄦ剰浠ヤ笅鍑犵偣錛?br />
"b"聽鏄緭鍑烘搷浣滄暟錛岀敱聽%0聽寮曠敤錛?a"聽鏄緭鍏ユ搷浣滄暟錛岀敱聽%1聽寮曠敤銆偮?br />"r"聽鏄搷浣滄暟鐨勭害鏉燂紝瀹冩寚瀹氬皢鍙橀噺聽"a"聽鍜屄?b"聽瀛樺偍鍦?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓傝娉ㄦ剰錛岃緭鍑烘搷浣滄暟綰︽潫搴旇甯︽湁涓涓害鏉熶慨楗扮聽"="錛屾寚瀹氬畠鏄緭鍑烘搷浣滄暟銆偮?br />瑕佸湪聽"asm"聽鍐呬嬌鐢?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>聽%eax錛?eax聽鐨勫墠闈㈠簲璇ュ啀鍔犱竴涓?錛屾崲鍙ヨ瘽璇村氨鏄?%eax錛屽洜涓郝?asm"聽浣跨敤聽%0銆?1聽絳夋潵鏍囪瘑鍙橀噺銆備換浣曞甫鏈変竴涓?聽鐨勬暟閮界湅浣滄槸杈撳叆錛忚緭鍑烘搷浣滄暟錛岃屼笉璁や負鏄?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>銆偮?br />絎笁涓啋鍙峰悗鐨勪慨楗?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>聽%eax聽鍛婅瘔灝嗗湪聽"asm"聽涓慨鏀孤燝CC聽%eax聽鐨勫鹼紝榪欐牱聽GCC聽灝變笉浣跨敤璇?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>瀛樺偍浠諱綍鍏跺畠鐨勫箋偮?br />movl聽%1,聽%%eax聽灝喡?a"聽鐨勫肩Щ鍒奧?eax聽涓紝聽movl聽%%eax,聽%0聽灝喡?eax聽鐨勫唴瀹圭Щ鍒奧?b"聽涓偮?br />鍥犱負聽"b"聽琚寚瀹氭垚杈撳嚭鎿嶄綔鏁幫紝鍥犳褰撀?asm"聽鐨勬墽琛屽畬鎴愬悗錛屽畠灝嗗弽鏄犲嚭鏇存柊鐨勫箋傛崲鍙ヨ瘽璇達紝瀵孤?asm"聽鍐吢?b"聽鎵鍋氱殑鏇存敼灝嗗湪聽"asm"聽澶栧弽鏄犲嚭鏉ャ偮?br />鐜板湪璁╂垜浠洿璇︾粏鐨勪簡瑙f瘡涓欏圭殑鍚箟銆?br />
姹囩紪紼嬪簭妯℃澘
姹囩紪紼嬪簭妯℃澘鏄竴緇勬彃鍏ュ埌聽C聽紼嬪簭涓殑姹囩紪鎸囦護錛堝彲浠ユ槸鍗曚釜鎸囦護錛屼篃鍙互鏄竴緇勬寚浠わ級銆傛瘡鏉℃寚浠ら兘搴旇鐢卞弻寮曞彿鎷搗錛屾垨鑰呮暣緇勬寚浠ゅ簲璇ョ敱鍙屽紩鍙鋒嫭璧楓傛瘡鏉℃寚浠よ繕搴旇鐢ㄤ竴涓畾鐣岀緇撳熬銆傛湁鏁堢殑瀹氱晫絎︿負鏂拌聽(\n)聽鍜屽垎鍙仿?銆偮?\n'聽鍚庡彲浠ヨ窡涓涓爐ab(\t)聽浣滀負鏍煎紡鍖栫鍙鳳紝澧炲姞聽GCC聽鍦ㄦ眹緙栨枃浠朵腑鐢熸垚鐨勬寚浠ょ殑鍙鎬с偮犳寚浠ら氳繃鏁奧?0銆?1聽絳夋潵寮曠敤聽C聽琛ㄨ揪寮忥紙鎸囧畾涓烘搷浣滄暟錛夈?br />
濡傛灉甯屾湜紜繚緙栬瘧鍣ㄤ笉浼氬湪聽"asm"聽鍐呴儴浼樺寲鎸囦護錛屽彲浠ュ湪聽"asm"聽鍚庝嬌鐢ㄥ叧閿瓧聽"volatile"銆傚鏋滅▼搴忓繀欏諱笌聽ANSI聽C聽鍏煎錛屽垯搴旇浣跨敤聽__asm__聽鍜屄燺_volatile__錛岃屼笉鏄燼sm聽鍜屄爒olatile銆?br />
鎿嶄綔鏁?br />C聽琛ㄨ揪寮忕敤浣溌?asm"聽鍐呯殑姹囩紪鎸囦護鎿嶄綔鏁般傚湪姹囩紪鎸囦護閫氳繃瀵孤燙聽紼嬪簭鐨劼燙聽琛ㄨ揪寮忚繘琛屾搷浣滄潵鎵ц鏈夋剰涔夌殑浣滀笟鐨勬儏鍐典笅錛屾搷浣滄暟鏄唴鑱旀眹緙栫殑涓昏鐗規с?br />
姣忎釜鎿嶄綔鏁伴兘鐢辨搷浣滄暟綰︽潫瀛楃涓叉寚瀹氾紝鍚庨潰璺熺敤鎷姬鎷搗鐨劼燙聽琛ㄨ揪寮忥紝渚嬪錛?constraint"聽(C聽expression)銆傛搷浣滄暟綰︽潫鐨勪富瑕佸姛鑳芥槸紜畾鎿嶄綔鏁扮殑瀵誨潃鏂瑰紡銆?br />
鍙互鍦ㄨ緭鍏ュ拰杈撳嚭閮ㄥ垎涓悓鏃朵嬌鐢ㄥ涓搷浣滄暟銆傛瘡涓搷浣滄暟鐢遍楀彿鍒嗛殧寮銆?br />
鍦ㄦ眹緙栫▼搴忔ā鏉垮唴閮紝鎿嶄綔鏁扮敱鏁板瓧寮曠敤銆傚鏋滄誨叡鏈壜爊聽涓搷浣滄暟錛堝寘鎷緭鍏ュ拰杈撳嚭錛夛紝閭d箞絎竴涓緭鍑烘搷浣滄暟鐨勭紪鍙蜂負聽0錛岄愰」閫掑錛屾渶鍚庨偅涓緭鍏ユ搷浣滄暟鐨勭紪鍙蜂負聽n聽-1銆傛繪搷浣滄暟鐨勬暟鐩檺鍒跺湪聽10錛屽鏋滄満鍣ㄦ弿榪頒腑浠諱綍鎸囦護妯″紡涓殑鏈澶ф搷浣滄暟鏁扮洰澶т簬聽10錛屽垯浣跨敤鍚庤呬綔涓洪檺鍒躲偮?br />
淇グ瀵勫瓨鍣?/b>鍒楄〃
濡傛灉聽"asm"聽涓殑鎸囦護鎸囩殑鏄‖浠?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>錛屽彲浠ュ憡璇壜燝CC聽鎴戜滑灝嗚嚜宸變嬌鐢ㄥ拰淇敼瀹冧滑銆傝繖鏍鳳紝GCC聽灝變笉浼氬亣璁懼畠瑁呭叆鍒拌繖浜?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓殑鍊兼槸鏈夋晥鍊箋傞氬父涓嶉渶瑕佸皢杈撳叆鍜岃緭鍑?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>鍒椾負聽clobbered錛屽洜涓郝燝CC聽鐭ラ亾聽"asm"聽浣跨敤瀹冧滑錛堝洜涓哄畠浠鏄庣‘鎸囧畾涓虹害鏉燂級銆備笉榪囷紝濡傛灉鎸囦護浣跨敤浠諱綍鍏跺畠鐨?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>錛屾棤璁烘槸鏄庣‘鐨勮繕鏄殣鍚殑錛?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓嶅湪杈撳叆綰︽潫鍒楄〃涓嚭鐜幫紝涔熶笉鍦ㄨ緭鍑虹害鏉熷垪琛ㄤ腑鍑虹幇錛夛紝瀵勫瓨鍣?/b>閮藉繀欏昏鎸囧畾涓轟慨楗板垪琛ㄣ備慨楗?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>鍒楀湪絎笁涓啋鍙蜂箣鍚庯紝鍏跺悕縐拌鎸囧畾涓哄瓧絎︿覆銆?br />
鑷充簬鍏抽敭瀛楋紝濡傛灉鎸囦護浠ユ煇浜涗笉鍙鐭ヤ笖涓嶆槑紜殑鏂瑰紡淇敼浜嗗唴瀛橈紝鍒欏彲鑳藉皢聽"memory"聽鍏抽敭瀛楁坊鍔犲埌淇グ瀵勫瓨鍣?/b>鍒楄〃涓傝繖鏍峰氨鍛婅瘔聽GCC聽涓嶈鍦ㄤ笉鍚屾寚浠や箣闂村皢鍐呭瓨鍊奸珮閫熺紦瀛樺湪瀵勫瓨鍣?/b>涓?br />
鎿嶄綔鏁扮害鏉?br />鍓嶉潰鎻愬埌榪囷紝"asm"聽涓殑姣忎釜鎿嶄綔鏁伴兘搴旇鐢辨搷浣滄暟綰︽潫瀛楃涓叉弿榪幫紝鍚庨潰璺熺敤鎷姬鎷搗鐨劼燙聽琛ㄨ揪寮忋傛搷浣滄暟綰︽潫涓昏鏄‘瀹氭寚浠や腑鎿嶄綔鏁扮殑瀵誨潃鏂瑰紡銆傜害鏉熶篃鍙互鎸囧畾錛?br />
鏄惁鍏佽鎿嶄綔鏁頒綅浜?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓紝浠ュ強瀹冨彲浠ュ寘鎷湪鍝簺縐嶇被鐨?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓?br />鎿嶄綔鏁版槸鍚﹀彲浠ユ槸鍐呭瓨寮曠敤錛屼互鍙婂湪榪欑鎯呭喌涓嬩嬌鐢ㄥ摢浜涚綾葷殑鍦板潃聽
鎿嶄綔鏁版槸鍚﹀彲浠ユ槸绔嬪嵆鏁奧?br />綰︽潫榪樿姹備袱涓搷浣滄暟鍖歸厤銆?br />
甯哥敤綰︽潫
鍦ㄥ彲鐢ㄧ殑鎿嶄綔鏁扮害鏉熶腑錛屽彧鏈変竴灝忛儴鍒嗘槸甯哥敤鐨勶紱涓嬮潰鍒楀嚭浜嗚繖浜涚害鏉熶互鍙婄畝瑕佹弿榪般傛湁鍏蟲搷浣滄暟綰︽潫鐨勫畬鏁村垪琛紝璇峰弬鑰兟燝CC聽鍜屄燝AS聽鎵嬪唽銆?br />
瀵勫瓨鍣?/b>鎿嶄綔鏁扮害鏉熉?r)聽
浣跨敤榪欑綰︽潫鎸囧畾鎿嶄綔鏁版椂錛屽畠浠瓨鍌ㄥ湪閫氱敤瀵勫瓨鍣?/b>涓傝鐪嬩笅渚嬶細聽
asm聽("movl聽%%cr3,聽%0\n"聽:"=r"(cr3val));
聽
榪欓噷錛屽彉閲徛燾r3val聽淇濆瓨鍦?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓紝%cr3聽鐨勫煎鍒跺埌瀵勫瓨鍣?/b>涓婏紝cr3val聽鐨勫間粠璇?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>鏇存柊鍒板唴瀛樹腑銆傛寚瀹毬?r"聽綰︽潫鏃訛紝GCC聽鍙互灝嗗彉閲徛燾r3val聽淇濆瓨鍦ㄤ換浣曞彲鐢ㄧ殑聽GPR聽涓傝鎸囧畾瀵勫瓨鍣?/b>錛屽繀欏婚氳繃浣跨敤鐗瑰畾鐨?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>綰︽潫鐩存帴鎸囧畾瀵勫瓨鍣?/b>鍚嶃?br />
a聽聽聽%eax
b聽聽聽%ebx
c聽聽聽%ecx
d聽聽聽%edx
S聽聽聽%esi
D聽聽聽%edi
聽
鍐呭瓨鎿嶄綔鏁扮害鏉熉?m)聽
褰撴搷浣滄暟浣嶄簬鍐呭瓨涓椂錛屼換浣曞瀹冧滑鎵ц鐨勬搷浣滈兘灝嗗湪鍐呭瓨浣嶇疆涓洿鎺ュ彂鐢燂紝榪欎笌瀵勫瓨鍣?/b>綰︽潫姝eソ鐩稿弽錛屽悗鑰呭厛灝嗗煎瓨鍌ㄥ湪瑕佷慨鏀圭殑瀵勫瓨鍣?/b>涓紝鐒跺悗灝嗗畠鍐欏洖鍐呭瓨浣嶇疆涓備絾瀵勫瓨鍣?/b>綰︽潫閫氬父鍙湪瀵逛簬鎸囦護鏉ヨ瀹冧滑鏄粷瀵瑰繀闇鐨勶紝鎴栬呭畠浠彲浠ュぇ澶ф彁楂樿繘紼嬮熷害鏃朵嬌鐢ㄣ傚綋闇瑕佸湪聽"asm"聽鍐呴儴鏇存柊聽C聽鍙橀噺錛岃屾偍鍙堢‘瀹炰笉甯屾湜浣跨敤瀵勫瓨鍣?/b>鏉ヤ繚瀛樺叾鍊兼椂錛屼嬌鐢ㄥ唴瀛樼害鏉熸渶涓烘湁鏁堛備緥濡傦紝idtr聽鐨勫煎瓨鍌ㄥ湪鍐呭瓨浣嶇疆聽loc聽涓細聽
聽("sidt聽%0\n"聽:聽:"m"(loc));
聽
鍖歸厤錛堟暟瀛楋級綰︽潫聽
鍦ㄦ煇浜涙儏鍐典笅錛屼竴涓彉閲忔棦瑕佸厖褰撹緭鍏ユ搷浣滄暟錛屼篃瑕佸厖褰撹緭鍑烘搷浣滄暟銆傚彲浠ラ氳繃浣跨敤鍖歸厤綰︽潫鍦?asm"聽涓寚瀹氳繖縐嶆儏鍐點偮?br />
asm聽("incl聽%0"聽:"=a"(var):"0"(var));
聽
鍦ㄥ尮閰嶇害鏉熺殑紺轟緥涓紝瀵勫瓨鍣?/b>聽%eax聽鏃㈢敤浣滆緭鍏ュ彉閲忥紝涔熺敤浣滆緭鍑哄彉閲忋傚皢聽var聽杈撳叆璇誨彇鍒奧?eax錛屽鍔犲悗灝嗘洿鏂扮殑聽%eax聽鍐嶆瀛樺偍鍦爒ar聽涓傝繖閲岀殑聽"0"聽鎸囧畾絎?聽涓緭鍑哄彉閲忕浉鍚岀殑綰︽潫銆傚嵆錛屽畠鎸囧畾聽var聽鐨勮緭鍑哄疄渚嬪彧搴旇瀛樺偍鍦?eax聽涓傝綰︽潫鍙互鐢ㄤ簬浠ヤ笅鎯呭喌錛?br />
杈撳叆浠庡彉閲忎腑璇誨彇錛屾垨鑰呭彉閲忚淇敼鍚庯紝淇敼鍐欏洖鍒板悓涓鍙橀噺涓?br />涓嶉渶瑕佸皢杈撳叆鎿嶄綔鏁板拰杈撳嚭鎿嶄綔鏁扮殑瀹炰緥鍒嗗紑聽
浣跨敤鍖歸厤綰︽潫鏈閲嶈鐨勬剰涔夊湪浜庡畠浠彲浠ュ鑷存湁鏁堝湴浣跨敤鍙敤瀵勫瓨鍣?/b>銆?br />
涓鑸唴鑱旀眹緙栫敤娉曠ず渚?br />浠ヤ笅紺轟緥閫氳繃鍚勭涓嶅悓鐨勬搷浣滄暟綰︽潫璇存槑浜嗙敤娉曘傛湁濡傛澶氱殑綰︽潫浠ヨ嚦浜庢棤娉曞皢瀹冧滑涓涓鍒楀嚭錛岃繖閲屽彧鍒楀嚭浜嗘渶緇忓父浣跨敤鐨勯偅浜涚害鏉熺被鍨嬨?br />
"asm"聽鍜?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>綰︽潫聽"r"聽璁╂垜浠厛鐪嬩竴涓嬩嬌鐢?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>綰︽潫聽r聽鐨劼?asm"銆傛垜浠殑紺轟緥鏄劇ず浜喡燝CC聽濡備綍鍒嗛厤瀵勫瓨鍣?/b>錛屼互鍙婂畠濡備綍鏇存柊杈撳嚭鍙橀噺鐨勫箋偮?br />
int聽main(void)
{
聽聽聽聽int聽x聽=聽10,聽y;
聽聽聽聽
聽聽聽聽asm聽("movl聽%1,聽%%eax;
聽聽聽聽
聽"movl聽%%eax,聽%0;"
聽聽聽聽聽聽聽聽:"=r"(y)聽聽/*聽y聽is聽output聽operand聽*/
聽聽聽聽聽聽聽聽:"r"(x)聽聽聽聽聽聽聽/*聽x聽is聽input聽operand聽*/
聽聽聽聽聽聽聽聽:"%eax";聽/*聽%eax聽is聽clobbered聽register聽*/
}
聽
鍦ㄨ渚嬩腑錛寈聽鐨勫煎鍒朵負聽"asm"聽涓殑聽y銆倄聽鍜屄爕聽閮介氳繃瀛樺偍鍦?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓紶閫掔粰聽"asm"銆備負璇ヤ緥鐢熸垚鐨勬眹緙栦唬鐮佸涓嬶細
main:
pushl聽%ebp
movl聽%esp,%ebp
subl聽錛?,%esp
movl聽錛?0,-4(%ebp)聽聽聽聽
movl聽-4(%ebp),%edx聽聽/*聽x=10聽is聽stored聽in聽%edx聽*/
#APP聽聽聽聽/*聽asm聽starts聽here聽*/聽聽聽
movl聽%edx,聽%eax聽聽聽聽聽/*聽x聽is聽moved聽to聽%eax聽*/
movl聽%eax,聽%edx聽聽聽聽聽/*聽y聽is聽allocated聽in聽edx聽and聽updated聽*/
#NO_APP聽/*聽asm聽ends聽here聽*/
movl聽%edx,-8(%ebp)聽聽/*聽value聽of聽y聽in聽stack聽is聽updated聽with聽
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽
聽the聽value聽in聽%edx聽*/聽
聽
褰撲嬌鐢?r"聽綰︽潫鏃訛紝GCC聽鍦ㄨ繖閲屽彲浠ヨ嚜鐢卞垎閰嶄換浣?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>銆傚湪鎴戜滑鐨勭ず渚嬩腑錛屽畠閫夋嫨聽%edx聽鏉ュ瓨鍌爔銆傚湪璇誨彇浜喡?edx聽涓爔聽鐨勫煎悗錛屽畠涓郝爕聽涔熷垎閰嶄簡鐩稿悓鐨?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>銆?br />
鍥犱負聽y聽鏄湪杈撳嚭鎿嶄綔鏁伴儴鍒嗕腑鎸囧畾鐨勶紝鎵浠ヂ?edx聽涓洿鏂扮殑鍊煎瓨鍌ㄥ湪聽-8(%ebp)錛屽爢鏍堜笂聽y聽鐨勪綅緗腑銆傚鏋溌爕聽鏄湪杈撳叆閮ㄥ垎涓寚瀹氱殑錛岄偅涔堝嵆浣垮畠鍦爕聽鐨勪復鏃?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>瀛樺偍鍊悸?%edx)聽涓鏇存柊錛屽爢鏍堜笂聽y聽鐨勫間篃涓嶄細鏇存柊銆?br />
鍥犱負聽%eax聽鏄湪淇グ鍒楄〃涓寚瀹氱殑錛孏CC聽涓嶅湪浠諱綍鍏跺畠鍦版柟浣跨敤瀹冩潵瀛樺偍鏁版嵁銆?br />
杈撳叆聽x聽鍜岃緭鍑郝爕聽閮藉垎閰嶅湪鍚屼竴涓?edx聽瀵勫瓨鍣?/b>涓紝鍋囪杈撳叆鍦ㄨ緭鍑轟駭鐢熶箣鍓嶈娑堣椼傝娉ㄦ剰錛屽鏋滄偍鏈夎澶氭寚浠わ紝灝變笉鏄繖縐嶆儏鍐典簡銆傝紜繚杈撳叆鍜岃緭鍑哄垎閰嶅埌涓嶅悓鐨?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓紝鍙互鎸囧畾聽&聽綰︽潫淇グ絎︺備笅闈㈡槸娣誨姞浜嗙害鏉熶慨楗扮鐨勭ず渚嬨?br />
int聽main(void)
{
聽聽聽聽int聽x聽=聽10,聽y;
聽聽聽聽
聽聽聽聽asm聽("movl聽%1,聽%%eax;
聽聽聽聽
聽"movl聽%%eax,聽%0;"
聽聽聽聽聽聽聽聽:"=&r"(y)聽/*聽y聽is聽output聽operand,聽note聽the聽聽聽聽
聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽聽
聽&聽constraint聽modifier.聽*/
聽聽聽聽聽聽聽聽:"r"(x)聽聽聽聽聽聽聽/*聽x聽is聽input聽operand聽*/
聽聽聽聽聽聽聽聽:"%eax";聽/*聽%eax聽is聽clobbered聽register聽*/
}
聽
浠ヤ笅鏄負璇ョず渚嬬敓鎴愮殑姹囩紪浠g爜錛屼粠涓彲浠ユ槑鏄懼湴鐪嬪嚭聽x聽鍜屄爕聽瀛樺偍鍦?asm"聽涓笉鍚岀殑瀵勫瓨鍣?/b>涓?br />
main:
pushl聽%ebp
movl聽%esp,%ebp
subl聽錛?,%esp
movl聽錛?0,-4(%ebp)
movl聽-4(%ebp),%ecx聽聽/*聽x,聽the聽input聽is聽in聽%ecx聽*/
#APP
聽聽聽聽movl聽%ecx,聽%eax
聽聽聽聽movl聽%eax,聽%edx聽聽聽聽聽/*聽y,聽the聽output聽is聽in聽%edx聽*/
#NO_APP
movl聽%edx,-8(%ebp)
聽
鐗瑰畾瀵勫瓨鍣?/b>綰︽潫鐨勪嬌鐢?br />鐜板湪璁╂垜浠湅涓涓嬪浣曞皢涓埆瀵勫瓨鍣?/b>浣滀負鎿嶄綔鏁扮殑綰︽潫鎸囧畾銆傚湪涓嬮潰鐨勭ず渚嬩腑錛宑puid聽鎸囦護閲囩敤聽%eax聽瀵勫瓨鍣?/b>涓殑杈撳叆錛岀劧鍚庡湪鍥涗釜瀵勫瓨鍣?/b>涓粰鍑鴻緭鍑猴細%eax銆?ebx銆?ecx銆?edx銆傚聽cpuid聽鐨勮緭鍏ワ紙鍙橀噺聽"op"錛変紶閫掑埌聽"asm"聽鐨劼爀ax聽瀵勫瓨鍣?/b>涓紝鍥犱負聽cpuid聽甯屾湜瀹冭繖鏍峰仛銆傚湪杈撳嚭涓嬌鐢燼銆乥銆乧聽鍜屄燿聽綰︽潫錛屽垎鍒敹闆嗗洓涓?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>涓殑鍊箋?br />
asm聽("cpuid"
:聽"=a"聽(_eax),
"=b"聽(_ebx),
"=c"聽(_ecx),
"=d"聽(_edx)
:聽"a"聽(op));
聽
鍦ㄤ笅闈㈠彲浠ョ湅鍒頒負瀹冪敓鎴愮殑姹囩紪浠g爜錛堝亣璁韭燺eax銆乢ebx聽絳?..聽鍙橀噺閮藉瓨鍌ㄥ湪鍫嗘爤涓婏級錛?br />
movl聽-20(%ebp),%eax聽/*聽store聽'op'聽in聽%eax聽--聽input聽*/
#APP
cpuid
#NO_APP
movl聽%eax,-4(%ebp)聽聽/*聽store聽%eax聽in聽_eax聽--聽output聽*/
movl聽%ebx,-8(%ebp)聽聽/*聽store聽other聽registers聽in
movl聽%ecx,-12(%ebp)聽
聽respective聽output聽variables聽*/
movl聽%edx,-16(%ebp)
聽
strcpy聽鍑芥暟鍙互閫氳繃浠ヤ笅鏂瑰紡浣跨敤聽"S"聽鍜屄?D"聽綰︽潫鏉ュ疄鐜幫細
asm聽("cld\n
聽聽聽聽
rep\n
聽聽聽聽
movsb"
聽聽聽聽
:聽/*聽no聽input聽*/
聽聽聽聽
:"S"(src),聽"D"(dst),聽"c"(count));
聽
閫氳繃浣跨敤聽"S"聽綰︽潫灝嗘簮鎸囬拡聽src聽鏀懼叆聽%esi聽涓紝浣跨敤聽"D"聽綰︽潫灝嗙洰鐨勬寚閽埪燿st聽鏀懼叆聽%edi聽涓傚洜涓郝爎ep聽鍓嶇紑闇瑕伮燾ount聽鍊鹼紝鎵浠ュ皢瀹冩斁鍏ヂ?ecx聽涓?br />
鍦ㄤ笅闈㈠彲浠ョ湅鍒板彟涓涓害鏉燂紝瀹冧嬌鐢ㄤ袱涓?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>聽%eax聽鍜屄?edx聽灝嗕袱涓?2聽浣嶇殑鍊煎悎騫跺湪涓璧鳳紝鐒跺悗鐢熸垚涓涓?4聽浣嶇殑鍊鹼細
#define聽rdtscll(val)聽\
聽__asm__聽__volatile__聽("rdtsc"聽:聽"=A"聽(val))
The聽generated聽assembly聽looks聽like聽this聽(if聽val聽has聽a聽64聽bit聽memory聽space).
#APP
rdtsc
#NO_APP
movl聽%eax,-8(%ebp)聽聽/*聽As聽a聽result聽of聽A聽constraint聽
movl聽%edx,-4(%ebp)聽聽
聽%eax聽and聽%edx聽serve聽as聽outputs聽*/
Note聽here聽that聽the聽values聽in聽%edx:%eax聽serve聽as聽64聽bit聽output.
聽
浣跨敤鍖歸厤綰︽潫
鍦ㄤ笅闈㈠皢鐪嬪埌緋葷粺璋冪敤鐨勪唬鐮侊紝瀹冩湁鍥涗釜鍙傛暟錛?br />
#define聽_syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)聽\
type聽name聽(type1聽arg1,聽type2聽arg2,聽type3聽arg3,聽type4聽arg4)聽\
{聽\
long聽__res;聽\
__asm__聽volatile聽("int聽錛?x80"聽\
:聽"=a"聽(__res)聽\
:聽"0"聽(__NR_##name),"b"聽((long)(arg1)),"c"聽((long)(arg2)),聽\
"d"聽((long)(arg3)),"S"聽((long)(arg4)));聽\
__syscall_return(type,__res);聽\
}
聽
鍦ㄤ笂渚嬩腑錛岄氳繃浣跨敤聽b銆乧銆乨聽鍜屄燬聽綰︽潫灝嗙郴緇熻皟鐢ㄧ殑鍥涗釜鑷彉閲忔斁鍏ヂ?ebx銆?ecx銆?edx聽鍜屄?esi聽涓傝娉ㄦ剰錛屽湪杈撳嚭涓嬌鐢ㄤ簡聽"=a"聽綰︽潫錛岃繖鏍鳳紝浣嶄簬聽%eax聽涓殑緋葷粺璋冪敤鐨勮繑鍥炲煎氨琚斁鍏ュ彉閲徛燺_res聽涓傞氳繃灝嗗尮閰嶇害鏉熉?0"聽鐢ㄤ綔杈撳叆閮ㄥ垎涓涓涓搷浣滄暟綰︽潫錛宻yscall聽鍙仿燺_NR_##name聽琚斁鍏ヂ?eax聽涓紝騫剁敤浣滃緋葷粺璋冪敤鐨勮緭鍏ャ傝繖鏍鳳紝榪欓噷鐨劼?eax聽鏃㈠彲浠ョ敤浣滆緭鍏?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>錛屽張鍙互鐢ㄤ綔杈撳嚭瀵勫瓨鍣?/b>銆傛病鏈夊叾瀹?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>鐢ㄤ簬榪欎釜鐩殑銆傚彟璇鋒敞鎰忥紝杈撳叆錛坰yscall聽鍙鳳級鍦ㄤ駭鐢熻緭鍑猴紙syscall聽鐨勮繑鍥炲鹼級涔嬪墠琚秷鑰楋紙浣跨敤錛夈?br />
鍐呭瓨鎿嶄綔鏁扮害鏉熺殑浣跨敤
璇瘋冭檻涓嬮潰鐨勫師瀛愰掑噺鎿嶄綔錛?br />
__asm__聽__volatile__(
"lock;聽decl聽%0"
:"=m"聽(counter)
:"m"聽(counter));
聽
涓哄畠鐢熸垚鐨勬眹緙栫被浼間簬錛?br />
#APP
聽聽聽聽lock
聽聽聽聽decl聽-24(%ebp)聽/*聽counter聽is聽modified聽on聽its聽memory聽location聽*/
#NO_APP.
聽
鎮ㄥ彲鑳借冭檻鍦ㄨ繖閲屼負聽counter聽浣跨敤瀵勫瓨鍣?/b>綰︽潫銆傚鏋滆繖鏍峰仛錛宑ounter聽鐨勫煎繀欏誨厛澶嶅埗鍒?b style="COLOR: black; BACKGROUND-COLOR: #ffff66">瀵勫瓨鍣?/b>錛岄掑噺錛岀劧鍚庡鍏跺唴瀛樻洿鏂般備絾榪欐牱鎮ㄤ細鏃犳硶鐞嗚В閿佸畾鍜屽師瀛愭х殑鍏ㄩ儴鎰忓浘錛岃繖浜涙槑紜樉紺轟簡浣跨敤鍐呭瓨綰︽潫鐨勫繀瑕佹с?br />
浣跨敤淇グ瀵勫瓨鍣?/b>
璇瘋冭檻鍐呭瓨鎷瘋礉鐨勫熀鏈疄鐜般?br />
聽聽聽asm聽("movl聽錛刢ount,聽%%ecx;
聽聽聽聽
up:聽lodsl;聽聽
聽聽聽聽
stosl;
聽聽聽聽
loop聽up;"
聽聽聽聽聽聽聽聽:聽聽聽聽聽聽聽聽聽聽聽/*聽no聽output聽*/
聽聽聽聽聽聽聽聽:"S"(src),聽"D"(dst)聽/*聽input聽*/
聽聽聽聽聽聽聽聽:"%ecx",聽"%eax"聽;聽聽/*聽clobbered聽list聽*/聽聽聽聽
聽
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