executing 16 bit pmode code

jtlb · **Joined:** Sat May 12, 2007 8:24 am **Posts:** 29

How can i do call a 16 bit pmode function from 32 bit pmode with no multitasking? it's for vesa.
thanks

Brynet-Inc · **Posted:** Sat May 26, 2007 4:48 pm

jtlb wrote:

How can i do call a 16 bit pmode function from 32 bit pmode with no multitasking? it's for vesa.
thanks

First of all.. "How can i do call a" sounds considerably funny spoken aloud.. :lol:

And I think you might be looking for v8086 mode... :roll:

Really.. Try using the "Search" feature.. The Wiki is a nice place to look as well..

http://www.osdev.org/wiki/Virtual_8086_Mode

(EDIT: Err.. 16bit pmode function?

..)

xyjamepa · **Joined:** Fri Sep 29, 2006 8:59 am **Posts:** 397

Also you can go back to real mode setup vesa then back again
to protected mode it's fast and easier than virtual mode.

Thanx.

Edwin · **Joined:** Thu Dec 21, 2006 5:19 pm **Posts:** 12

To call a 16bit pmode function, i think you need to setup a gdt entry for 16bit pmode and then do a far call to that selector and address of the function.
@Brynet-Inc: I think he is trying to call the pmode interface of the VBE.

Brynet-Inc · **Posted:** Sat May 26, 2007 5:22 pm

Edwin wrote:

@Brynet-Inc: I think he is trying to call the pmode interface of the VBE.

I see, I had that in my initial response.. I removed it because I wasn't entirely sure about it.

So the VBE protected mode interface refers to 16bit protected mode not 32bit.. I shall make a note of it lol.. :wink:

inflater · **Posted:** Sun May 27, 2007 6:55 am

For example, Windows 3.11, 3.1 and the second mode of 3.0 were in 16-bit protected mode. But take a look to Windows NT 3.51 - it has the same look as good ol' 3.1, and it is 32bit !

inflater

OSDev.org

executing 16 bit pmode code

Who is online