From:	"Andrew Jones" <xluminous AT hotmail DOT com>
Newsgroups:	comp.os.msdos.djgpp
References:	<fyoofqnexgrpubet DOT fnhsod0 DOT pminews AT nntp DOT generation DOT net>
Subject:	Re: VESA, DJGPP, calling far-functions
Lines:	38
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Date:	Wed, 29 Dec 1999 12:43:43 GMT
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This is also being CC'd as my ISP's news server is rather unreliable.

I think you would have to look into the DPMI function
__dpmi_simulate_real_mode_procedure_retf, which, as you can probably tell
from the name, calls a real mode procedure which is terminated with a far
return instruction.  You just set up the __dpmi_regs structure like any
other, and have the CS/IP pair point to the segment:offset given from VBE
function 1 (Get Mode Information).  The registers you need are just put into
the __dpmi_regs structure as well.

Although I could be wrong.  I don't use VESA 1.2 anymore (VBE2/3, Linear
Frame Buffer!).

Hope this helps,

Andrew Jones
xluminous AT NOSPAM DOT hotmail DOT com

> Hi,
>
> I'm working on a VESA 1.2 library.. One of the features of the 1.2
> specification requires me to call a function pointed to by a far-pointer
with
> specific values inside my registers.. Now, up to this point I made us of
> __dpmi_int() whenever I wanted to manipulate real-mode interrupts using
> DJGPP, but this is totally different.
>
> How do I:
>
> 1) Call this function which is accessible in real-mode (since its pointed
to
> by a far-pointer)
>
> 2) Control what values are in the registers right before I call this
> function?

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