FENIX_kernel/arch/i386/interrupt.c

#include <kernel/interrupt.h>
#include <sys/io.h>

void idt_init(void) {
  extern int load_idt();
  extern int irq0();
  extern int irq1();
  extern int irq2();
  extern int irq3();
  extern int irq4();
  extern int irq5();
  extern int irq6();
  extern int irq7();
  extern int irq8();
  extern int irq9();
  extern int irq10();
  extern int irq11();
  extern int irq12();
  extern int irq13();
  extern int irq14();
  extern int irq15();

  unsigned long irq0_address;
  unsigned long irq1_address;
  unsigned long irq2_address;
  unsigned long irq3_address;
  unsigned long irq4_address;
  unsigned long irq5_address;
  unsigned long irq6_address;
  unsigned long irq7_address;
  unsigned long irq8_address;
  unsigned long irq9_address;
  unsigned long irq10_address;
  unsigned long irq11_address;
  unsigned long irq12_address;
  unsigned long irq13_address;
  unsigned long irq14_address;
  unsigned long irq15_address;
  unsigned long idt_address;
  unsigned long idt_ptr[2];

  /* remap PIC */
  outb(0x20, 0x11);
  outb(0xA0, 0x11);
  outb(0x21, 0x20);
  outb(0xA1, 40);
  outb(0x21, 0x04);
  outb(0xA1, 0x02);
  outb(0x21, 0x01);
  outb(0xA1, 0x01);
  outb(0x21, 0x0);
  outb(0xA1, 0x0);

  irq0_address = (unsigned long) irq0;
  IDT[32].offset_lowerbits = irq0_address & 0xffff;
  IDT[32].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[32].zero = 0;
  IDT[32].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[32].offset_higherbits = (irq0_address & 0xffff0000) >> 16;

  irq1_address = (unsigned long) irq1;
  IDT[33].offset_lowerbits = irq1_address & 0xffff;
  IDT[33].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[33].zero = 0;
  IDT[33].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[33].offset_higherbits = (irq1_address & 0xffff0000) >> 16;

  irq2_address = (unsigned long) irq2;
  IDT[34].offset_lowerbits = irq2_address & 0xffff;
  IDT[34].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[34].zero = 0;
  IDT[34].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[34].offset_higherbits = (irq2_address & 0xffff0000) >> 16;

  irq3_address = (unsigned long) irq3;
  IDT[35].offset_lowerbits = irq3_address & 0xffff;
  IDT[35].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[35].zero = 0;
  IDT[35].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[35].offset_higherbits = (irq3_address & 0xffff0000) >> 16;

  irq4_address = (unsigned long) irq4;
  IDT[36].offset_lowerbits = irq4_address & 0xffff;
  IDT[36].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[36].zero = 0;
  IDT[36].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[36].offset_higherbits = (irq4_address & 0xffff0000) >> 16;

  irq5_address = (unsigned long) irq5;
  IDT[37].offset_lowerbits = irq5_address & 0xffff;
  IDT[37].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[37].zero = 0;
  IDT[37].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[37].offset_higherbits = (irq5_address & 0xffff0000) >> 16;

  irq6_address = (unsigned long) irq6;
  IDT[38].offset_lowerbits = irq6_address & 0xffff;
  IDT[38].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[38].zero = 0;
  IDT[38].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[38].offset_higherbits = (irq6_address & 0xffff0000) >> 16;

  irq7_address = (unsigned long) irq7;
  IDT[39].offset_lowerbits = irq7_address & 0xffff;
  IDT[39].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[39].zero = 0;
  IDT[39].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[39].offset_higherbits = (irq7_address & 0xffff0000) >> 16;

  irq0_address = (unsigned long) irq0;
  IDT[40].offset_lowerbits = irq0_address & 0xffff;
  IDT[40].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[40].zero = 0;
  IDT[40].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[40].offset_higherbits = (irq0_address & 0xffff0000) >> 16;

  irq8_address = (unsigned long) irq8;
  IDT[41].offset_lowerbits = irq8_address & 0xffff;
  IDT[41].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[41].zero = 0;
  IDT[41].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[41].offset_higherbits = (irq8_address & 0xffff0000) >> 16;

  irq0_address = (unsigned long) irq0;
  IDT[42].offset_lowerbits = irq0_address & 0xffff;
  IDT[42].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[42].zero = 0;
  IDT[42].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[42].offset_higherbits = (irq0_address & 0xffff0000) >> 16;

  irq9_address = (unsigned long) irq9;
  IDT[43].offset_lowerbits = irq9_address & 0xffff;
  IDT[43].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[43].zero = 0;
  IDT[43].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[43].offset_higherbits = (irq9_address & 0xffff0000) >> 16;

  irq10_address = (unsigned long) irq10;
  IDT[44].offset_lowerbits = irq10_address & 0xffff;
  IDT[44].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[44].zero = 0;
  IDT[44].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[44].offset_higherbits = (irq10_address & 0xffff0000) >> 16;

  irq11_address = (unsigned long) irq11;
  IDT[45].offset_lowerbits = irq11_address & 0xffff;
  IDT[45].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[45].zero = 0;
  IDT[45].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[45].offset_higherbits = (irq11_address & 0xffff0000) >> 16;

  irq12_address = (unsigned long) irq12;
  IDT[46].offset_lowerbits = irq12_address & 0xffff;
  IDT[46].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[46].zero = 0;
  IDT[46].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[46].offset_higherbits = (irq12_address & 0xffff0000) >> 16;

  irq13_address = (unsigned long) irq13;
  IDT[47].offset_lowerbits = irq13_address & 0xffff;
  IDT[47].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[47].zero = 0;
  IDT[47].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[47].offset_higherbits = (irq13_address & 0xffff0000) >> 16;

  irq14_address = (unsigned long) irq14;
  IDT[48].offset_lowerbits = irq14_address & 0xffff;
  IDT[48].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[48].zero = 0;
  IDT[48].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[48].offset_higherbits = (irq14_address & 0xffff0000) >> 16;

  irq15_address = (unsigned long) irq15;
  IDT[49].offset_lowerbits = irq15_address & 0xffff;
  IDT[49].selector = 0x08; /* KERNEL_CODE_SEGMENT OFFSET */
  IDT[49].zero = 0;
  IDT[49].type_attr = 0x8e; /* INTERRUPT_GATE */
  IDT[49].offset_higherbits = (irq15_address & 0xffff0000) >> 16;

  /* Fill IDT descriptor */
  idt_address = (unsigned long)IDT;
  idt_ptr[0] = (sizeof(struct IDT_entry) * 256) + ((idt_address & 0xffff) << 16);
  idt_ptr[1] = idt_address >> 16;

  load_idt(idt_ptr);
}

/* Programmable Interrupt Timer Interrupt */
void irq0_handler(void) {
  outb(0x20, 0x20); /* End of interrupt */
}

/* Keyboard Interrupt */
void irq1_handler(void) {
  outb(0x20, 0x20);
}

/* Cascade. Can probably be ignored. */
void irq2_handler(void) {
  outb(0x20, 0x20);
}

/* COM2 (Serial Port) */
void irq3_handler(void) {
  outb(0x20, 0x20);
}

/* COM1 (Serial Port) */
void irq4_handler(void) {
  outb(0x20, 0x20);
}

/* LPT2 (Parallel Port) */
void irq5_handler(void) {
  outb(0x20, 0x20);
}

/* Floppy Disk */
void irq6_handler(void) {
  outb(0x20, 0x20);
}

/* LPT1 (Parallel Port)/Primary PIC Spurious Interrupts */
void irq7_handler(void) {
  outb(0x20, 0x0b);
  if(inb(0x20) & 0x80) { return; } /* Spurious interrupt */
  outb(0x20, 0x20); /* Don't send this for spurious interrupts */
}

/* CMOS RTC */
void irq8_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* Peripherals/Legacy SCSI/NIC */
void irq9_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* Peripherals/SCSI/NIC */
void irq10_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* Peripherals/SCSI/NIC */
void irq11_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* PS2 Mouse */
void irq12_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* FPU/Coprocessor/Inter-processor */
void irq13_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* Primary ATA Hard Drive */
void irq14_handler(void) {
  outb(0xA0, 0x20);
  outb(0x20, 0x20);
}

/* Secondary ATA Hard Drive/Secondary PIC Spurious Interrupt */
void irq15_handler(void) {
  outb(0xA0, 0x0b);
  if(!(inb(0xA0) & 0x80)) {
    /* Not spurious. Do stuff here! */
    outb(0xA0, 0x20);
  }
  outb(0x20, 0x20);
}