From:	"David Mitchell" <dmitchell AT inet DOT net DOT nz>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Assembly routine
Date:	Fri, 2 Jul 1999 17:12:22 +1200
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aperes wrote in message <377b163a DOT 2813653 AT news DOT telepac DOT pt>...
>
>Please help me!
>
>I'm trying to write a routine that transfers the contents of a buffer
>to video memory. This is my routine:
>
>    FlipAsm(_my_ds(), (int) virtual_screen);

you want to call it by:
    FlipAsm(_my_ds(), &virtual_screen);

also:
>  asm("
>       MOVW %0, %%ES  /* ES= video (%0)  */
>       MOVW %1, %%DS  /* DS= buffer (%1) = segmento dados */
>
>       MOVL $0xA0000, %%EAX
>       MOVL %%EAX, %%EDI /* EDI = Ax0000, ES:DI
>       MOVL %2, %%EAX
>       MOVL %%EAX, %%ESI /* ESI = source, DS:SI */


This code is wrong.  You are moving the Data segment to ES, whereas you want
to move 0x0a000 to ES, and xorw %%si, %%si
Then it should work.  You don't need the video variable.

David

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