Ku dayashada Linus Torvalds: Ka abuur xoq (VI) nidaamkaaga qalliinka u gaarka ah

Hagaag, qaanso yar kadib waxaan kusii wadaynaa taxanaheena casharrada. Haddii aan ku noqonno koodhkii hore, waa inaan haysannaa ISR ee qaybta eber. Hadda waa inaan buuxinaa inta hartay ISRs ee aan fariin u dirnay (32-kii ugu horreeyay). Hagaag hada waxaan sii wadaynaa joojinta barnaamijyada, waxaan sameyn doonnaa IRQs sidoo kale loo yaqaan Kala Goynta Codsiyada. IRQ-yadaani waxaa soo saara aaladaha qalabka sida teebabka, jiirka, madbacadaha, iwm. Markii hore 8-da IRQ ee uguhoreysa waxaa si otomaatig ah loogu sawiraa boosaska IDT 8 ilaa 15. Maadaama aan u isticmaalnay 32-dii ugu horreeyay marka laga reebo hadda waa inaan iska dhaafnaa. Waxaan ka dhigi doonaa IRQ 32 ilaa 45. Tan darteed waa inaan marka hore ka baxnaa IRQs:

void ND::IRQ::Remap(int pic1, int pic2)
{
#define PIC1 0x20
#define PIC2 0xA0
#define ICW1 0x11
#define ICW4 0x01
/* send ICW1 */
ND::Ports::OutputB(PIC1, ICW1);
ND::Ports::OutputB(PIC2, ICW1);
/* send ICW2 */
ND::Ports::OutputB(PIC1 + 1, pic1); /* remap */
ND::Ports::OutputB(PIC2 + 1, pic2); /* pics */
/* send ICW3 */
ND::Ports::OutputB(PIC1 + 1, 4); /* IRQ2 -> connection to slave */
ND::Ports::OutputB(PIC2 + 1, 2);
/* send ICW4 */
ND::Ports::OutputB(PIC1 + 1, ICW4);
ND::Ports::OutputB(PIC2 + 1, ICW4);
/* disable all IRQs */
ND::Ports::OutputB(PIC1 + 1, 0xFF);
}

Hadda waxaan abuureynaa shaqeyn si aan u rakibno IRQs:

void ND::IRQ::Install()
{
ND::Screen::SetColor(ND_SIDE_FOREGROUND,ND_COLOR_BLACK);
ND::Screen::PutString("\nInstalling IRQ...");
ND::IRQ::Remap(0x20,0x28);
ND::IDT::SetGate(32,(unsigned)ND::IRQ::IRQ1,0x08,0x8E);
ND::IDT::SetGate(33,(unsigned)ND::IRQ::IRQ2,0x08,0x8E);
ND::IDT::SetGate(34,(unsigned)ND::IRQ::IRQ3,0x08,0x8E);
ND::IDT::SetGate(35,(unsigned)ND::IRQ::IRQ4,0x08,0x8E);
ND::IDT::SetGate(36,(unsigned)ND::IRQ::IRQ5,0x08,0x8E);
ND::IDT::SetGate(37,(unsigned)ND::IRQ::IRQ6,0x08,0x8E);
ND::IDT::SetGate(38,(unsigned)ND::IRQ::IRQ7,0x08,0x8E);
ND::IDT::SetGate(39,(unsigned)ND::IRQ::IRQ8,0x08,0x8E);
ND::IDT::SetGate(40,(unsigned)ND::IRQ::IRQ9,0x08,0x8E);
ND::IDT::SetGate(41,(unsigned)ND::IRQ::IRQ10,0x08,0x8E);
ND::IDT::SetGate(42,(unsigned)ND::IRQ::IRQ11,0x08,0x8E);
ND::IDT::SetGate(43,(unsigned)ND::IRQ::IRQ12,0x08,0x8E);
ND::IDT::SetGate(44,(unsigned)ND::IRQ::IRQ13,0x08,0x8E);
ND::IDT::SetGate(45,(unsigned)ND::IRQ::IRQ14,0x08,0x8E);
ND::IDT::SetGate(46,(unsigned)ND::IRQ::IRQ15,0x08,0x8E);
ND::IDT::SetGate(47,(unsigned)ND::IRQ::IRQ16,0x08,0x8E);
ND::Screen::SetColor(ND_SIDE_FOREGROUND,ND_COLOR_GREEN);
ND::Screen::PutString("done");
asm volatile("sti");
}

Xukunka asm sti waxaan dhaqaajineynaa IRQs. Hagaag hada waxaan la aadeynaa wax la mid ah ISR. Hawlaha IRQ aasaasiga ah:

void ND::IRQ::IRQ1()
{
asm volatile(
"cli \n"
"pushl 0\n"
"pushl 32\n"
"jmp ND_IRQ_Common"
);
}


Qeyb guud (oo lamid ah ISR):

extern "C"
void ND_IRQ_Common()
{
asm volatile(
"pusha \n"
"push %ds\n"
"push %es\n"
"push %fs\n"
"push %gs\n"
"movw $0x10, %ax \n"
"movw %ax, %ds \n"
"movw %ax, %es \n"
"movw %ax, %fs \n"
"movw %ax, %gs \n"
"movl %esp, %eax \n"
"push %eax \n"
"movl $ND_IRQ_Handler, %eax \n"
"call *%eax \n"
"popl %eax \n"
"popl %ds \n"
"popl %es \n"
"popl %fs \n"
"popl %gs \n"
"popa \n"
"addl 8, %esp \n"
"iret \n"
);
}


Iyo maamulaha aasaasiga ah:

extern "C"
void ND_IRQ_Handler(struct regs* r)
{
void (*handler)(struct regs *r);
if(r->int_no >= 40)
{
ND::Ports::OutputB(0xA0,0x20);
}
ND::Ports::OutputB(0x20,0x20);
}


Iyada oo tan la adeegsanayo waa inaan horeyba u hawlgalnaa IRQ xitaa haddii aysan weli waxba qaban. Cutubka xiga waxaan ku arki doonaa sida looga helo xogta IRQ-yadaas sida saacadda ama kumbuyuutarka.

Taasina waxay ku egtahay qoraalka maanta. Sida aad hada u aragto waxaan qori ka yar si joogto ah arimo kale awgood. Xitaa sidaas waan sii wadi doonaa illaa aan ka helayo nidaam hawlgal oo dhammaystiran