Ukulinganisa iLinus Torvalds: yenza eyakho inkqubo yokusebenza ukusuka ekuqaleni (VII)

Wamkelekile kwenye iposti malunga uyenza njani eyethu inkqubo yokusebenza (Amanqaku angaphambili kuthotho: 1, 2, 3, 4, 5 y 6). Kube lixesha elide ukusukela kwisithuba sokugqibela, ikakhulu ngenxa yesiphene endisifumene kule nto sinayo namhlanje. Siza kubona Uyiphatha njani iwotshi kuyilo loyilo lwe-x86.

Ngaphambili besizisebenzisa ii-IRQ ngendlela eqhelekileyo, kodwa bekukho ingxaki encinci kuba khange sizisebenzise ngokuchanekileyo kwaye sidlulise idatha eyongezelelweyo. Ekugqibeleni siyayilungisa imvucube kwaye mna naye sinokuqhubeka nokubeka izimvo malunga nendlela yokuqhubeka.

Ewe, iwotshi yi-IRQ, ngakumbi eyokuqala. Ukuyiqwalasela, siya kusebenzisa umsebenzi esiwuchaze apha ngasentla ukufaka i-IRQs, i-ND_IRQ_InstallHandler.

I-ND_TIMER_TICKS = 0; I-ND engekhoyo: Isikhathi: Isigaba (int hz) {int isahluli = 1193180 / hz; ND :: amazibuko :: IziphumoB (0x43,0x36); ND :: Amazibuko :: IziphumoB (0x40, isahluli kunye ne-0xFF); ND :: amazibuko :: IziphumoB (0x40, isahluli >> 8); } void ND :: Timer :: Linda (int (amakhalane)) {unsigned long eticks; eticks = ND_TIMER_TICKS + amakhalane; ngelixa (ND_TIMER_TICKS <eticks) {void ND :: Timer :: Setup () {ND :: Screen :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_BLACK); ND :: Screen :: PutString ("\ nSeta ixesha ..."); ND_IRQ_InstallHandler (0, & ND_Timer_Handler); ND :: Isikrini :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_GREEN); ND :: Screen :: PutString ("yenziwe"); } ngaphandle "C" kungasebenzi ND_Timer_Handler (struct regs * r) {ND_TIMER_TICKS ++; ukuba (ND_TIMER_TICKS% 18 == 0) {// ND :: Iscreen :: SetColor (ND_SIDE_FOREGROUND, ND_COLOR_BROWN); // ND :: Screen :: PutString ("\ nOmnye umzuzwana"); KUFUNEKA SENZE ISIBHENO SOKUHLAZIYA}}

Ikhowudi isebenza ngolu hlobo lulandelayo: inkqubo yokuqalisa yokufowuna ND :: Isibali-xesha :: Ukuseta, ebiza ND_IRQ_InstallHandler ukufaka kwindawo yokuqala, i-IRQ0, umsebenzi wokubuyela emva xa isiganeko senzeka, oko kukuthi ND_Isibali_Isixhasi eyonyusa i iikethi. Njengoko sibeke isantya sewotshi saya kwi-18 Hz, njengoko siza kubona kamva, ukuba singohlulahlula ngo-18 kwaye sisinike inani elipheleleyo, umzuzwana ubungadlula.

Umsebenzi ND :: Ixesha :: Isigaba Isinceda ukuba sihlengahlengise isantya se ixesha, elo nani linomtsalane li-1.19 MHz elixabiso elifanayo. Ewe kufanelekile ukuba siwubize lo msebenzi ukuba sifuna ukutshintsha isantya sefayile ye- ixesha, ngokungagqibekanga iya kwi-18,22 Hz, ixabiso elikhethekileyo ekufanele ukuba umntu enze isigqibo kulo IBM sisekhona unanamhla.

Umsebenzi ND :: Isikhathi :: Yima ilula ngokulula, linda nje ngomtya lo gama Kude kube iikethi kufuneka iqhubeke.

Emfanekisweni sinokubona ukuba ukuba siyayikhupha ikhowudi ngaphakathi kwi-ND_Timer_Handler siyifumana le:

Kwisahluko esilandelayo siza kubona indlela yokufunda igalelo lekhibhodi kwaye wenze kancinci iqokobhe ukunxibelelana nenkqubo yethu. Njengesiqhelo, ikhowudi iyafumaneka kwi GitHub phantsi kwelayisensi I-GNU GPL v2.