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

Sibuyela kuthotho lwezifundo ngendlela yokwenza eyethu inkqubo yokusebenza. Ndicinga ukuba ungasithanda kakhulu esi sahluko kuba ekugqibeleni sinokunxibelelana nenkqubo yethu yokusebenza. Namhlanje siza kufunda igalelo lekhibhodi. Kule nto, isikimu siyafana nesibali xesha. Kufuneka sisebenzise i-IRQs nangona kunjalo ke siza kuqala ngokufana nesibali xesha.

ND_IRQ_InstallHandler (1, & ND_Keyboard_Handler);

Isiphatho sethu sekhibhodi, nangona kunjalo, sinzima ngakumbi kuba sifunda izitshixo kwaye sizifaka kwisikhuseli.

ngaphandle "C" akukho ND_Keyboard_Handler (struct regs * r) {unsigned char scancode = ND :: Keyboard :: GetChar (); ukuba (scancode! = 255) {ND :: Screen :: PutChar (scancode); umtyaBuffer [umtyaPos] = skancode; umtyaPos ++; }}

http://gist.github.com/634afddcb3e977ea202d

Singajonga ukuba siwubiza njani umsebenzi obizwa ngokuba yi-ND :: Keyboard :: GetChar. Apho sifumana umlinganiswa kwaye ukuba ayingomlinganiswa ongenanto (apha ndisebenzise ama-255, kuya kufuneka sisebenzise inkqubo ebhetele) sibeka umlinganiswa kwiscreen kwaye siyigcina kwisikhombisi esilula seetshathi (oku kunjalo ngokuxhomekeke kuphuculo, inkqubo yangoku inokugcwala).

Itshati esayiniweyo :: Ikhibhodi :: GetChar () {unsigned char scancode; scancode = (itshathi engatyikitywanga) ND :: Amazibuko :: InputB (0x60); ukuba (scancode & ND_KEYBOARD_KEY_RELEASE) {buyela 255; } enye {buyela en_US [scancode]; }} itshathi * ND :: Ikhibhodi :: GetString () {ngelixa (umtyaBuffer [umtyaPos-1]! = '\ n') {} umtyaPos = 0; umtya wokubuyaBuffer; }

http://gist.github.com/2d4f13e0b1a281c66884

Apha siyabona ukuba isitshixo esicinezelweyo sifunyanwa njani. Ku-0x60 kuya kuhlala kukho iqhosha lokugqibela elicinezelweyo. Ngapha koko, inokufundwa ngokuthe ngqo ngaphandle kokusebenzisa i-IRQ, kodwa ke ngekhe sazi ukuba sichonga njani xa utshintsho lwenzekile. Apho sijonga ngo-AND ukusebenza ukuba ikhowudi esiyifumeneyo iyahambelana nesitshixo esele sikhutshiwe.

Kwimeko apho sibuyisa ama-255 (kuba siyakuhoya kamva) kwaye kungenjalo isitshixo sicofiwe. Kwimeko apho sibuyisa indawo yoluhlu olubizwa ngokuba yi-en_US. Loluphi ulwazi olu luqulathe olu luhlu? Olu luhlu yinto esinokuyibiza ngokuba yimephu ephambili okanye imephu yomlinganiswa. Njengoko usazi, iilwimi ezahlukeneyo zineekhibhodi ezahlukeneyo kwaye azixhaswanga njengoko zibhala ngaphezulu amaqhosha. Ke i-en_US iya kusinika isitshixo esihambelana nekhowudi nganye kwaye iya kusebenza kwikhibhodi yaseMelika.

itshathi engabhaliswanga en_US [128] = {0,27, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0 ',' - ',' = ',' b ',' t ',' q ',' w ',' e ',' r ',' t ',' y ',' u ',' mna ' ',' o ',' p ',' [','] ',' \ n ', 0, / * Ctrl * /' a ',' s ',' d ',' f ',' g ',' 'h', 'j', 'k', 'l', ';', '\' ',' `, 0, / * Ekhohlo Shift * / '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', ',', ',', 0, / * Ishifti sasekunene * / '*', 0, / * Alt * / '', 0, / * Oonobumba abakhulu / / 0,0,0,0,0,0,0,0,0,0, / * F1-F10 amaqhosha * / 0, / * Num lock * / 0, / * Skrolela isitshixo * / 0, / * Isitshixo sasekhaya * / 0, / * Utolo oluphezulu * / 0, / * Iphepha phezulu * / '-', 0, / * Utolo lwasekhohlo * / 0, 0, / * Utolo lwasekunene * / '+', 0, / * Isiphelo sokugqibela * / 0, / * Utolo olusezantsi * / 0, / * Iphepha ezantsi * / 0, / * Faka isitshixo * / 0, / * Cofa isitshixo * / 0,0,0, 0, 0, 11, / * F12-F0 Keys * / XNUMX};

http://gist.github.com/bf52085aec05f3070b65

Kwakukho nomsebenzi ochaziweyo ofumana ibinzana. Injongo kukuba ngokulula ukufikelela kwimitya evela kwizicelo eziyifunayo, okwangoku kuphela. Ndithetha nge-NextShellLite, uhlobo oluncitshisiweyo lweqokobhe elizayo kwi-NextDivel. Injongo ye-NextShellLite kukubonelela ngeqokobhe elincitshisiweyo lokuvavanya ukusebenza okuncinci kancinci kancinci. Andizukubeka ikhowudi yegobolondo apha kodwa ndiyifakile ngaphakathi kwekhowudi ye-NextDivel.

Okwangoku ayisebenzi njengenkqubo eyahlukileyo kodwa njengomsebenzi obizwa ngokuba yi-kernel, ikakhulu kuba asikongezi ukhetho lokusebenzisa izinto ezinokuphunyezwa. Kwaye ke, eminye imifanekiso yendlela iqokobhe elisebenza ngayo nemisebenzi emitsha yokufaka ikhibhodi.