I'm looking for the way to get the initial value of a screen terminal
in Linux Assembly (AT&T syntax/GAS).

The version of the program that works OK in MSDOS is the following:

_dir_pantalla PROC FAR
       push es
       xor ax,ax
       mov es,ax
       mov dl,es:[449H]
       cmp dl,7
       je b0
       cmp dl,2
       je b8
       cmp dl,3
       je b8
error: mov ax,-1
       mov dx,-1
       jmp fin
b0:    mov dx,0B000h
       jmp fin
b8:    mov dx,0B800H
fin:   pop es
       ret
_dir_pantalla ENDP

Then I can use the screen like a matrix 80 x 25 with the first element
being the initial screen address and I can write a character &
attribute to each position of the matrix (this is,each position of the
screen).
I need the same code for Linux using GAS syntax.

Thanks

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