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Re: [Qemu-devel] Split vga module

From: Màrius Montón
Subject: Re: [Qemu-devel] Split vga module
Date: Wed, 25 Jun 2008 19:55:11 +0200
User-agent: Thunderbird (X11/20080505)

Blue Swirl wrote:
On 6/25/08, Màrius Montón <address@hidden> wrote:
 Hello, and thank you for your quick answer,

 the problem I see is not with the register access (this is done for other devices) but with the graphics side.
 I don't understand how VGA device draws the screen, (I guess is done using SDL), and I think this part is too merged with QEMU itself. Is it true?


 Blue Swirl wrote:
   On 6/25/08, Màrius Montón <address@hidden> wrote:

      Hello all,

 My question is how I can split VGA module in a different process from QEMU.

 I need it in order to simulate a VGA module described in SystemC into QEMU (http://www.greensocs.com/en/projects/QEMUSystemC) where all SystemC stuff runs in other process than QEMU.

 I look at the code, and vga code seems to be too merged with QEMU itself to be splitted.. but, there's any solution?

      Interesting. You could try to catch all IO and MMIO towards VGA and
redirect those to the other process with some kind of IPC. You must
change the MMIO area registration, because now the VGA MMIO accesses
are optimised so that no callbacks are involved.

Well, the graphics side can be SDL, VNC or dummy. I wonder why would
you want to handle that area, because from the emulated system point
of view, your device would be between the screen and the VGA card.
In fact my idea is to replace the vga module with a new one, using SystemC stuff, and because this stuff is in a different process (communicated with qemu using sockets) I need to split VGA part (both emulated part and graphics part) from QEMU

Màrius Montón i Macián   address@hidden   http://cephis.uab.es
Hardware Engineer
Centre de Prototips i Solucions Hardware-Software
Dep. Microelectrònica i Sistemes Electrònics
ETSE - Universitat Autònoma de Barcelona (UAB)
Phone: +34 935 813 534
Fax: +34 935 813 033
QC-2090D. ETSE. Campus UAB.
080193 Bellaterra

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