OSDev.org

Posted: **Fri May 27, 2016 5:24 pm**

Hello guys , my IRQ's are not working when i remap the pic and register the Interrupt routines and call irq_install in main function i got this message from qemu : Booting From ROM , and my os not boot

code of error:

Code: Select all

void remap_pic()
{
outportb (0x20, 0x11);
outportb (0xA0, 0x11);
outportb (0x21, 0x20);
outportb (0xA1, 0x28);
outportb (0x21, 0x04);
outportb (0xA1, 0x02);
outportb (0x21, 0x01);
outportb (0xA1, 0x01);
outportb (0x21, 0x0);
outportb (0xA1, 0x0);
}



void irq_install()
{

  remap_pic();

  idt_set_gate (32, (unsigned)irq0, 0x08, 0x8E);
  idt_set_gate (33, (unsigned)irq1, 0x08, 0x8E);
  idt_set_gate (34, (unsigned)irq2, 0x08, 0x8E);
  idt_set_gate (35, (unsigned)irq3, 0x08, 0x8E);
  idt_set_gate (36, (unsigned)irq4, 0x08, 0x8E);
  idt_set_gate (37, (unsigned)irq5, 0x08, 0x8E);
  idt_set_gate (38, (unsigned)irq6, 0x08, 0x8E);
  idt_set_gate (39, (unsigned)irq7, 0x08, 0x8E);
  idt_set_gate (40, (unsigned)irq8, 0x08, 0x8E);
  idt_set_gate (41, (unsigned)irq9, 0x08, 0x8E);
  idt_set_gate (42, (unsigned)irq10, 0x08, 0x8E);
  idt_set_gate (43, (unsigned)irq11, 0x08, 0x8E);
  idt_set_gate (44, (unsigned)irq12, 0x08, 0x8E);
  idt_set_gate (45, (unsigned)irq13, 0x08, 0x8E);
  idt_set_gate (46, (unsigned)irq14, 0x08, 0x8E);
  idt_set_gate (47, (unsigned)irq15, 0x08, 0x8E);



}

when i not call irq_install , on main my os work , what's is happening?

Posted: **Fri May 27, 2016 8:10 pm**

Does it triple fault? Is a different IRQ handler called? Do you have software interrupts working before hardware IRQs? You need to give more information than a code snippet.

Posted: **Fri May 27, 2016 8:23 pm**

yes i have software interrupts working , not triple fault

Posted: **Fri May 27, 2016 8:26 pm**

Then define "IRQ error". What does IRQ error mean? What happens on IRQ?

Posted: **Fri May 27, 2016 8:32 pm**

irq error that i said is because when every time a call irq set up routine in my kernel main qemu not boot my system its says boot from rom

Posted: **Fri May 27, 2016 8:47 pm**

QEMU says "Booting from ROM..." whenever you boot your kernel using the -kernel command-line option. What IRQ are you waiting to receive? Without calling your IRQ initialization code, what happens? What does QEMU show?

Posted: **Fri May 27, 2016 9:23 pm**

without irq initialization code my os on qemu works fine . i`m not waiting an interrupt . i'm just put irqs on idt and call the code of initialization on kernel main

Posted: **Sun May 29, 2016 3:25 pm**

Do you happen to have a CLI; HLT; pair somewhere in your code? In QEMU this is an infamous way to prevent any updates to the screen from showing.

OSDev.org

IRQ error on qemu

IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu

Re: IRQ error on qemu