Ukulingisa iLinus Torvalds: Dala uhlelo lwakho lokusebenza kusuka ekuqaleni (VI)

Yebo, ngemuva kobakaki abancane siyaqhubeka nochungechunge lwezifundo zethu. Uma sibuyela kukhodi edlule kufanele sibe ne-ISR yokwehlukanisa ngo-zero. Manje kufanele sigcwalise amanye ama-ISR esasiwathumele (ama-32 okuqala). Hhayi-ke manje sizoqhubeka nokuphazamiseka kohlelo, sizokwenza i-IRQ eyaziwa nangokuthi Ukuphazamisa Izicelo. Lawa ma-IRQ akhiqizwa ngamadivayisi wehadiwe njengamakhibhodi, amagundane, amaphrinta, njll. Ekuqaleni ama-IRQ ayisishiyagalombili ahlelwe ngokuzenzakalela ezikhundleni ze-IDT 8 kuya ku-8. Njengoba sisebenzise ama-15 okuqala kokungafani manje kufanele siwavuselele. Sizobeka i-IRQ kusuka ku-32 kuye ku-32. Ngalokhu kufanele siqale sibuyise ama-IRQ:

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);
}

Manje sakha umsebenzi ukufaka ama-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");
}

Isigwebo se-asm sti senza ama-IRQ asebenze. Well manje sihamba nokuthile okufana ne-ISR. Imisebenzi ye-IRQ eyisisekelo:

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


Ingxenye ejwayelekile (efanayo ne-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"
);
}


Nesiphathi esiyisisekelo:

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);
}


Ngalokhu kufanele ukuthi i-IRQ isebenze vele noma ngabe bengenzi lutho. Esahlukweni esilandelayo sizobona ukuthi singayithola kanjani idatha kusuka kula ma-IRQ afana newashi noma ikhibhodi.

Futhi ngalokhu kuphela okuthunyelwe kwanamuhla. Njengoba ubona manje ngibhala kancane njalo ngenxa yezinye izingqinamba. Noma kunjalo ngizoqhubeka ngize ngibe nohlelo oluphelele lokusebenza