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byMatrix7
Mon Mar 15, 2010 7:49 am
Forum: Advanced OS Development
Topic: How to get display's resolution?
Replies: 1
Views: 45181

How to get display's resolution?

I want to know how to get display's resolution by call bios interrupt
byMatrix7
Sat Jul 11, 2009 3:15 pm
Forum: Beginning OS Development
Topic: problem in demo 8
Replies: 14
Views: 62162

Re: problem in demo 8

The problem is solved!
I modified the code to

Code: Select all

void _declspec (naked) i86_pit_irq () {
	_asm pushad

	//! increment tick count
	_pit_ticks++;

	//! tell hal we are done
	interruptdone(0);
	_asm popad
	_asm iretd
}
And all works well currently!

Thanks very much!
byMatrix7
Fri Jul 10, 2009 4:19 pm
Forum: Beginning OS Development
Topic: problem in demo 8
Replies: 14
Views: 62162

Re: problem in demo 8

I found that i86_pit_irq() pushed 4 dword when it is called!
If I replaced "_asm add esp, 12" with "_asm add esp, 16", the #GP is not generated!
But the DebugPuts works wrong, it only display first line!

And I want to know when it generate "invalid op code"!

Thanks!
byMatrix7
Thu Jul 09, 2009 9:18 am
Forum: Beginning OS Development
Topic: problem in demo 8
Replies: 14
Views: 62162

Re: problem in demo 8

What code are you using for your i86_pit_irq() function? In almost all normal functions used as irq handlers, C/C++ doesnt deal properly with the stack pointer because the order of the stack for Interrupts. ~Andrew void _cdecl i86_pit_irq () { _asm add esp, 12 _asm pushad //! increment tick count _...
byMatrix7
Wed Jul 08, 2009 3:28 am
Forum: Beginning OS Development
Topic: problem in demo 8
Replies: 14
Views: 62162

problem in demo 8

After enabling interrupt, it will generate General Protection Fault when we using for(;;){}

I think the stack is damaged and the #GP is generated after i86_pit_irq() is called.
The ebp is changed after i86_pit_irq() is called.
But i don't know why it changes.
byMatrix7
Thu Jun 25, 2009 11:03 am
Forum: Advanced OS Development
Topic: How to debug c++ codes?
Replies: 4
Views: 62216

Re: How to debug c++ codes?

It is not possible to use step-through debugging on your kernel. What the tutorials mean by debugging at this stage is excess printf statements around the suspect bit of code to see exactly what is going on If you NEED step through debugging, Bochs has a commandline debugging mode that you can try ...
byMatrix7
Thu Jun 25, 2009 6:44 am
Forum: Advanced OS Development
Topic: How to debug c++ codes?
Replies: 4
Views: 62216

Re: How to debug c++ codes?

You should follow this tutorial of how to setup the Kernel with C++ for debuging. http://www.brokenthorn.com/Resources/OSDevMSVC.html I tried using MSVC08 but I had error while compiling, I changed to MSVC05 and Everything works better now. :D I'm using MSVC08 and it works very well. I want to debu...
byMatrix7
Sun Jun 21, 2009 3:20 pm
Forum: Advanced OS Development
Topic: How to debug c++ codes?
Replies: 4
Views: 62216

How to debug c++ codes?

Thanks for your your tutorial!
I am following this tutorial, and i am in tutorial 14 now.
We use c++, but how to debug c++ codes?

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