Re: Call for Foundation-supported Project Ideas

On 1/4/22, Emmanuel Vadot <manu@bidouilliste.com> wrote:
>  You can't get or set the mode after ExitBootService in UEFI, you only
> have the framebuffer setup by the firmware.
>
>> With non-UEFI or old UGA UEFI implementations possibly one could use
>> the dual BIOS´ CSM part. Just call the CSM BIOS init to set up GPU and
>> the int 10h interface, and then set previously used mode+redraw.
>> BTW, doing that also could both enable vt(4) to change
>> modes/resolutions and using sc on UEFI computers.
>
>  UGA have nothing to do with having CSM.
>  Also I'm unsure if INT 10 would work when booted in UEFI, i.e. I don't
> think that the firmware will setup the handler in non-CSM mode.

After the UEFI boot service is no longer needed, one can check the VGA
BIOS UEFI signature for presence of a dual BIOS with normal VGA BIOS
(which is being used in CSM mode) in addition to UEFI BIOS.
Afaik, there are few if any UEFI compatible graphics cards without
dual BIOS, as those would not work in computers without UEFI.
If VGA BIOS presence is detected on the graphics card, calling the VGA
BIOS init sets up the int 10h handler.
After doing this, the UEFI crap limitations are gone.


On 1/4/22, Emmanuel Vadot <manu@bidouilliste.com> wrote:
> On Tue, 4 Jan 2022 08:14:23 +0100
> Stefan Blachmann <sblachmann@gmail.com> wrote:
>
>> On 1/4/22, Warner Losh <imp@bsdimp.com> wrote:
>> > Not without loading the xorg graphics stuff... graphics chips from the
>> > last
>> > 15 or 20 years have lots of chip specific state that only the graphics
>> > stuff knows about... IIRC, it only knows about it because it put the
>> > graphics into a known state... it's the main reason laptops stopped
>> > suspending in the early 2000s... it looks to be a lot of work for a
>> > relatively rare use case...
>>
>> UEFI GOP seems to have the necessary functionalities
>> (https://wiki.osdev.org/GOP#Get_the_Current_Mode) so I guess the work
>> required would be limited (restore mode and redraw screen from
>> buffer).
>
>  ?
>  You can't get or set the mode after ExitBootService in UEFI, you only
> have the framebuffer setup by the firmware.
>
>> With non-UEFI or old UGA UEFI implementations possibly one could use
>> the dual BIOS´ CSM part. Just call the CSM BIOS init to set up GPU and
>> the int 10h interface, and then set previously used mode+redraw.
>> BTW, doing that also could both enable vt(4) to change
>> modes/resolutions and using sc on UEFI computers.
>
>  UGA have nothing to do with having CSM.
>  Also I'm unsure if INT 10 would work when booted in UEFI, i.e. I don't
> think that the firmware will setup the handler in non-CSM mode.
>
>> But I think you are right, there are probably not too many users who
>> would make use of that.
>>
>>
>> On 1/4/22, Warner Losh <imp@bsdimp.com> wrote:
>> > On Mon, Jan 3, 2022, 11:03 PM Stefan Blachmann <sblachmann@gmail.com>
>> > wrote:
>> >
>> >> Implementing S3 suspend/resume was a sponsored project itself.
>> >> However, it still does only work when at xorg graphics mode, which
>> >> already was topic in this thread.
>> >> When using it from console, no matter sc or vt, it still hangs with
>> >> dark screen and unresponsive keyboard.
>> >> Could finishing the suspend/resume work be sponsored, so that it also
>> >> works on console-only computers?
>> >>
>> >
>> > Not without loading the xorg graphics stuff... graphics chips from the
>> > last
>> > 15 or 20 years have lots of chip specific state that only the graphics
>> > stuff knows about... IIRC, it only knows about it because it put the
>> > graphics into a known state... it's the main reason laptops stopped
>> > suspending in the early 2000s... it looks to be a lot of work for a
>> > relatively rare use case...
>> >
>> > Warner
>> >
>> >
>> >> On 12/30/21, Joseph Mingrone <jrm@freebsd.org> wrote:
>> >> > On Thu, 2021-12-30 at 14:15, Joseph Mingrone <jrm@FreeBSD.org>
>> >> > wrote:
>> >> >
>> >> >> On Thu, 2021-12-30 at 08:05, Özkan KIRIK <ozkan.kirik@gmail.com>
>> >> >> wrote:
>> >> >>> I've ideas about enhancing the routing architecture. Is it
>> >> >>> possible
>> >> >>> to
>> >> >>> add to wiki?
>> >> >
>> >> >> Certainly.  Please do.
>> >> >
>> >> > The link again is https://wiki.freebsd.org/2021FoundationCFI
>> >> >
>> >>
>> >>
>> >
>>
>
>
> --
> Emmanuel Vadot <manu@bidouilliste.com> <manu@FreeBSD.org>
>