asm()

asm()

[Jean-Baptiste CAMPESATO]

Hello,
I search help to use the asm procedure. Somebody can help me ?
*Type of syntax (AT&T, x86...), and what are the others arguments*
And if possible, have you an example to switch to 13h (the graphic mode).
Thanks a lot.

Re: asm()

[Ludovic Brenta]

Jean-Baptiste CAMPESATO writes:
> Hello,
> I search help to use the asm procedure. Somebody can help me ?
> *Type of syntax (AT&T, x86...), and what are the others arguments*
> And if possible, have you an example to switch to 13h (the graphic mode).
> Thanks a lot.

There is no "asm procedure".  The Ada term for what you want is
"machine code insertions".  ARM 13.8 states that machine code
insertions are defined by the compiler, but that the compiler must do
so by means of package System.Machine_Code.

Since I remember you use GNAT on GNU/Linux, look at the GNAT User's
Guide, chapter "Inline Assembler", for a complete discussion.  GNAT
supports AT&T syntax only.

I'm not sure how to switch the video card to VESA mode 16#13# (13h),
if that's what you mean.  Doing so requires direct access to the
hardware, doesn't it?  I'm nor sure that Linux provides such direct
access, I suspect you'll have to use the framebuffer interface, or
svgalib.

-- 
Ludovic Brenta.

Re: asm()

[Jean-Baptiste CAMPESATO]

Le Tue, 22 Mar 2005 00:13:10 +0100, Ludovic Brenta a ￜcritￜ:

> Jean-Baptiste CAMPESATO writes:
>> Hello,
>> I search help to use the asm procedure. Somebody can help me ?
>> *Type of syntax (AT&T, x86...), and what are the others arguments*
>> And if possible, have you an example to switch to 13h (the graphic mode).
>> Thanks a lot.
> 
> There is no "asm procedure".  The Ada term for what you want is
> "machine code insertions".  ARM 13.8 states that machine code
> insertions are defined by the compiler, but that the compiler must do
> so by means of package System.Machine_Code.
> 
> Since I remember you use GNAT on GNU/Linux, look at the GNAT User's
> Guide, chapter "Inline Assembler", for a complete discussion.  GNAT
> supports AT&T syntax only.
> 
> I'm not sure how to switch the video card to VESA mode 16#13# (13h),
> if that's what you mean.  Doing so requires direct access to the
> hardware, doesn't it?  I'm nor sure that Linux provides such direct
> access, I suspect you'll have to use the framebuffer interface, or
> svgalib.

Thanks.
But i create a "little kernel" to use the VGA mode 13h.
With a bootstrap in ASM.
I will read the chapter "Inline Assembler".
bye