Ukulingisa iLinus Torvalds: dala uhlelo lwakho lokusebenza kusuka ekuqaleni (VII)

Uyemukelwa kokunye okuthunyelwe mayelana indlela yokwenza uhlelo lwethu lokusebenza (Imibhalo yangaphambilini ochungechungeni: 1, 2, 3, 4, 5 y 6). Sekuyisikhathi eside kusukela iposi lokugcina, ikakhulukazi ngenxa yesiphazamiso engisitholile kulokhu esinakho namuhla. Sizobona uliphatha kanjani iwashi kubuchwepheshe bokwakhiwa kwe-x86.

Esikhathini esedlule besisebenzise ama-IRQ ngendlela ejwayelekile, kepha kube nenkinga encane njengoba singazisebenzisanga kahle futhi sidlulise imininingwane eyengeziwe. Ekugcineni siyakulungisa i-carlosorta futhi mina nami singaqhubeka nokuphawula ukuthi singaqhubeka kanjani.

Iwashi yi-IRQ, ikakhulukazi eyokuqala. Ukuyimisa sizosebenzisa umsebenzi esiwuchaze ngaphambilini ukufaka i-IRQs, i-ND_IRQ_InstallHandler.

int ND_TIMER_TICKS = 0; ize ND :: Isikhathi :: Isigaba (int hz) {int isihlukanisi = 1193180 / hz; ND :: Amachweba :: OkukhiphayoB (0x43,0x36); ND :: Izimbobo :: OkukhiphayoB (0x40, isihlukanisi & 0xFF); ND :: Izimbobo :: OkukhiphayoB (0x40, isihlukanisi >> 8); } i-ND engekho :: Isikhathi :: Linda (int imikhaza) {unsigned long eticks; imikhaza = ND_TIMER_TICKS + imikhaza; ngenkathi (ND_TIMER_TICKS <eticks) {void ND :: Isikhathi :: Ukusetha () {ND :: Screen :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_BLACK); ND :: Screen :: PutString ("\ nIsibali sikhathi sokusetha ..."); ND_IRQ_InstallHandler (0, & ND_Timer_Handler); ND :: Screen :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_GREEN); ND :: Screen :: PutString ("kwenziwe"); } i-extern "C" iyize ND_Timer_Handler (struct regs * r) {ND_TIMER_TICKS ++; uma (ND_TIMER_TICKS% 18 == 0) {// ND :: Screen :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_BROWN); // ND :: Screen :: PutString ("\ nOmunye umzuzwana"); KUFANELE SENZE ISIKHATHI SOKUQALA

Ikhodi isebenza kanjena: izingcingo zohlelo lokuqalisa ND :: Isikhathi :: Ukusetha, ebiza ND_IRQ_InstallHandler ukufaka endaweni yokuqala, i-IRQ0, umsebenzi wokuphinda ushayele lapho kwenzeka umcimbi, okungukuthi ND_Timer_Handler lokho kukhulisa i- imikhaza. Njengoba sibeke ijubane lewashi laya ku-18 Hz, njengoba sizobona ngokuhamba kwesikhathi, uma silihlukanisa ngo-18 bese lisinika inani, bekuzodlula umzuzwana.

Umsebenzi ND :: Isikhathi :: Isigaba Kusisiza ukuguqula ijubane le- i-timer, lelo nani eliwubukhazikhazi lingu-1.19 MHz okuyinani elijwayelekile. Yebo, kufanele siwubize lo msebenzi uma sifuna ukushintsha ijubane le- i-timer, ngokuzenzakalela iya ku-18,22 Hz, inani eliyingqayizivele umuntu okufanele ngabe anqume ngaphakathi IBM lisekhona kuze kube namuhla.

Umsebenzi ND :: Isikhathi :: Linda ilula kabi, vele ulinde nge-loop ngenkathi kuze kube imikhaza okudingekayo ukuqhubeka.

Emfanekisweni siyabona ukuthi uma sikhipha ikhodi ikhodi ngaphakathi kwe-ND_Timer_Handler sithola lokhu:

Esahlukweni esilandelayo sizobona ukuthi singakufunda kanjani ukufaka ikhibhodi futhi senze okuncane igobolondo ukuxhumana nesistimu yethu. Njengenjwayelo, ikhodi iyatholakala ku GitHub ngaphansi kwelayisense I-GNU GPL v2.