LIDT in VC++ ??

[LordMage]

okay, I am still looking online but can't find anything so far. I know to load the IDT you simply call

lidt [idt_pointer]

but I can't stick my variable in VC++'s inline assembler. I get 'Improper Operand Type' as an error. here is what I have tried and the deffinition of my idt_pointer

Okay, I have tried both:

Code: Select all

_asm {
     lidt idt_desc
}

and...

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_asm {
     lidt [idt_desc]
}

neither work. same error.

here is the code defining my pointer

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struct
{
	unsigned short size;
	unsigned long offset;
} idt_desc;

idt_desc.size=(256*8)-1;
idt_desc.offset=(unsigned long )idt;

_asm
 {
	lidt idt_desc
}

I have also tried making the offset a pointer and have tried to directly make idt_desc a pointer, none of them work and usually cause more errors.

any suggestions would be great.

[neon]

Code: Select all

_asm {
     lidt [idt_desc]
} 

Hm...This should work... You do do this inside of a function, correct? (i.e, not globally as shown in your example code?) If so, then it should work just fine...

If you like, try this (From my MSVC++ kernel):

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// load interrupt descriptor table
#define lidt(idt) \
	_asm cli \
	_asm lidt [idt]

To use it, just call it like this:

Code: Select all

lidt (idt_desc);

[LordMage]

Yes, they are being called from inside of Interrupt::Interrupt() I think I will try the define method and see if that works, thanks for the suggestion

[LordMage]

Okay, that looks better but I am still getting the same error. I sure wish I knew what I was doing haha! again, I am open to any suggestions that anyone might have.

[neon]

Okay, that looks better but I am still getting the same error. I sure wish I knew what I was doing haha! again, I am open to any suggestions that anyone might have.

I kind of expected that. What complier do you have?

I am using MSVC++ 2005, which is the code I posted.

[LordMage]

I am using the exact same development enviroment you are, that is why I was using your tutorials to get started. you just haven't covered this part in detail yet.

I did get it working. I was thinking about what you said about the global vs. local, everything except for the struct definition was local operation inside a funciton. I double checked and the struct was defined as a part of the class. I moved it to inside the constructor and now it is working. Next step keyboard map thanks for the help

[neon]

I'm glad you got it working