Re: asm()

[Jean-Baptiste CAMPESATO <camje_lemon@nospam.a2lf.org>]

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