From: Bartosz Fabianowski <bartosz@fabianowski.de>
To: qemu-devel@nongnu.org
Subject: [Qemu-devel] Purpose of Cirrus VGA BIOS
Date: Tue, 08 Jun 2004 01:02:05 +0200 [thread overview]
Message-ID: <40C4F3ED.7050205@fabianowski.de> (raw)
Hi all
I am trying to figure out how the new Cirrus emulation works. One thing
I am still not sure about is the purpose of the Cirrus BIOS. The
emulation coded inside QEMU seems to be trapping the graphics card
interrupt as well as port and memory accesses. It also performs lots of
operations and reacts to registers being changed or the interrupt being
invoked. So, what exactly is the purpose of the graphics card BIOS in
this scenario? What purpose does it serve? Obviously, a real Cirrus BIOS
contains lots of code that would control a real Cirrus graphics card and
that is totally unnecessary in QEMU. What other stuff does it contain
that can't be done in native C code?
- Bartosz
next reply other threads:[~2004-06-07 23:03 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-06-07 23:02 Bartosz Fabianowski [this message]
2004-06-08 3:14 ` [Qemu-devel] Purpose of Cirrus VGA BIOS Antony T Curtis
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