Re: A20 delay

[Quality Quorum <qqi@world.std.com>]

On 16 Dec 1999, Ian Lance Taylor wrote:

>    Date: Thu, 16 Dec 1999 00:40:42 -0500 (EST)
>    From: Quality Quorum <qqi@world.std.com>
> 
>    > I did find this case:
>    > 
>    > 	ljmpl	$0x08, $1f
>    > 1:
>    > 
>    > This is not a branch instruction.  In gas syntax, the two operand ljmp
>    > instruction takes an immediate operand.  $1f is an immediate operand
>    > referring to the label 1f.
> 
>    Wow, how lucky I am that I only occasinally have to do this stuff.
>    BTW, is it documented somewhere ? I would be able to fiure it 
>    out on my own in year.
> 
> Forward and backward labels are documented in the gas manual.  I don't
> think dollar labels are documented.
> 
> The use of $ as an immediate prefix in i386 code, and the way to use
> the ljmpl instruction with gas, is documented in the gas manual, in
> the i386 specific section on the AT&T syntax implemented by gas.
> 
> It's hard to know where to look, though.

Thanks a lot it is really an enlightment to read your mail 
on the topic.

> 
> Ian
> 

Thanks,

Aleksey