Re: [RFC PATCH v3 0/3] Add segment limit checks to emulator

[Avi Kivity <avi@redhat.com>]

  On 07/25/2010 07:23 PM, Kevin O'Connor wrote:
> On Sun, Jul 25, 2010 at 11:54:20AM +0300, Avi Kivity wrote:
>>   On 07/24/2010 06:45 PM, Kevin O'Connor wrote:
>>> On Mon, Jul 12, 2010 at 04:13:06PM +0300, Avi Kivity wrote:
>>>> Does SeaBIOS use big real mode now?
>>> SeaBIOS calls option roms in big real mode.  This is required by the
>>> relevant specs.
>> Can you provide a pointer?
> See the PMM spec section 2.2 and section 3.2.4.  (Sadly, I can't find
> a link to the PMM spec on the web anymore - hopefully you have a
> copy.)  Also see the PCI Firmware Specification v3.0 - section
> 5.2.1.9.

Unfortunately, I don't have a copy.

> The specs don't require any code addresses to be>64K, but it does
> require data access over 64K.  I doubt there are many systems that use
> a code address>64K, because an interrupt in big real mode still only
> stores a 16bit return address - thus an irq (or nmi) in that mode will
> basically cause a crash.

Ok.  Flat 4G segments happen to accidentally work in kvm-intel, and we 
can keep it working.

-- 
error compiling committee.c: too many arguments to function