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Hi all,

when I setup APIC mode, disable pic, start smp, OS Kernel goes ok! but I can´t do Reset...

I have been trying keyboard reset, idt with 0 size triple fault reset, and nothing...

my OS just freeze...

does anyone got an idea? just some start please!

thanks so much...

TBH, I don't know much about SMP. But you can try ACPI reset. It's very simple, even simpler than ACPI shutdown.
EDIT: Forgot to say this, ACPI reset isn't supported on Bochs and QEMU, and appears to be broken in VirtualBox. It seems, you'll have to test it on real hardware.

thank you so much.
I´ll check these out!

I have used the triple fault reset before; I'm not sure why it's not working for you. I used to do it with interrupts enabled - not sure if that matters.

thanks... it is a kind of odd stuff...
I can´t figure out why it doesn´t Works.!!!

Did you try ACPI reset?

Maybe post the code that you're using for your triple-fault reset?

At some of my pcs is not supported!
I don´t understand why that happens...

when I use PIC 8259 Works ok! triple fault, keyboard reset, everything... when I change to APIC, nothing Works....

Why not try something like this?

hum... cool thanks.. I´ll try this...

thanks so much...

omarrx024 wrote:Why not try something like this?

Code: Select all

void reset()
{
	disable_apic();
	enable_pic();
	disable_smp();

	outportb(0x64,0xFE);		// keyboard reset
	while(1);
}

Sounds good, replace the keyboard reset with your preferred reset method (or try each in turn, from order of most supported to least supported, for maximum compatibility). I was going to suggest something similar to this since he mentioned that the issue occurs only when using the APIC but it is OK when using the PIC.

Of course, you should try ACPI reset first. If that doesn't work, then try the keyboard reset. If all doesn't work, then a triple fault should be a last resort, as it doesn't reset some PCs.

omarrx024 wrote:If all doesn't work, then a triple fault should be a last resort, as it doesn't reset some PCs.

Really??? I thought that a reset after an unhandled triple-fault was the one constant in os-dev...

onlyonemac wrote:

omarrx024 wrote:If all doesn't work, then a triple fault should be a last resort, as it doesn't reset some PCs.

Really??? I thought that a reset after an unhandled triple-fault was the one constant in os-dev...

The triple fault was introduced in the 286, whose programming manual says that it puts the CPU into a shutdown cycle. Most chipsets interpret the shutdown cycle being initiated to mean "the processor needs to be reset", so they pull the reset pin high (or maybe it's low, I can't remember and I don't have a CPU manual on hand) and the CPU resets.

Technically, if this behaviour has not changed (and it likely hasn't, backwards compatibility being Intel's best friend), it would be a valid option for the shutdown cycle to lead to a power-off or simply a hang.

Hi all, I´m glad to say that now I can do reset!

the problem was at my setup_pic code

thanks so much guys. a lot ...