ReactOS gdt limit

[Henning Schild]

Hello ROS dev-team,

i am currently working on qemu/kqemu and found that ROS sets the gdt
limit to 0x800. At least this is what i see in qemu, i did not check
ROS source.

http://www.intel.com/design/processor/manuals/253668.pdf (3.5.1 p. 3-21)
> > the GDT limit should always be one less than an integral multiple of
> > eight (that is, 8N – 1)

This may or may not be a problem.

For all i can say ROS was the only of many different OSs that triggered
the check in my setup. I may be wrong and wont investigate this any
further. Just wanted to let you know.

I used this version:
http://prdownloads.sourceforge.net/reactos/ReactOS-0.3.4-REL-qemu.zip

and that are the values i saw:
base = 0x808bdac0
limit = 0x00000800

regards,
Henning

[Alex Ionescu]

The IDT Limit should be 0x7FF, and the GDT limit should be 0x3FF.

I believe ReactOS sets the IDT Limit incorrectly, and perhaps the GDT  
as well.

On 17-Apr-08, at 2:33 PM, Henning Schild wrote:
> Hello ROS dev-team,
>
> i am currently working on qemu/kqemu and found that ROS sets the gdt
> limit to 0x800. At least this is what i see in qemu, i did not check
> ROS source.
>
> http://www.intel.com/design/processor/manuals/253668.pdf (3.5.1 p.  
> 3-21)
> > > the GDT limit should always be one less than an integral multiple of
> > > eight (that is, 8N – 1)
>
> This may or may not be a problem.
>
> For all i can say ROS was the only of many different OSs that  
> triggered
> the check in my setup. I may be wrong and wont investigate this any
> further. Just wanted to let you know.
>
> I used this version:
> http://prdownloads.sourceforge.net/reactos/ReactOS-0.3.4-REL-qemu.zip
>
> and that are the values i saw:
> base = 0x808bdac0
> limit = 0x00000800
>
> regards,
> Henning
>
> Ros-dev mailing list
> [e-mail]
> http://www.reactos.org/mailman/listinfo/ros-dev

Best regards,
Alex Ionescu

[gedmurphy]

Hi Henning.

This has been fixed in r33007, it will be in the next release (0.3.5) or you
can try a trunk build if you're brave : http://www.reactos.org/getbuilds

Thanks for taking the time to report this.

Regards,
Ged

-----Original Message-----
From: [e-mail] [mailto:[e-mail]] On
Behalf Of Alex Ionescu
Sent: 17 April 2008 20:01
To: ReactOS Development List
Subject: Re: [ros-dev] ReactOS gdt limit

The IDT Limit should be 0x7FF, and the GDT limit should be 0x3FF.

I believe ReactOS sets the IDT Limit incorrectly, and perhaps the GDT  
as well.

On 17-Apr-08, at 2:33 PM, Henning Schild wrote:
> Hello ROS dev-team,
>
> i am currently working on qemu/kqemu and found that ROS sets the gdt
> limit to 0x800. At least this is what i see in qemu, i did not check
> ROS source.
>
> http://www.intel.com/design/processor/manuals/253668.pdf (3.5.1 p.  
> 3-21)
> > > the GDT limit should always be one less than an integral multiple of
> > > eight (that is, 8N - 1)
>
> This may or may not be a problem.
>
> For all i can say ROS was the only of many different OSs that  
> triggered
> the check in my setup. I may be wrong and wont investigate this any
> further. Just wanted to let you know.
>
> I used this version:
> http://prdownloads.sourceforge.net/reactos/ReactOS-0.3.4-REL-qemu.zip
>
> and that are the values i saw:
> base = 0x808bdac0
> limit = 0x00000800
>
> regards,
> Henning
>
> Ros-dev mailing list
> [e-mail]
> http://www.reactos.org/mailman/listinfo/ros-dev

Best regards,
Alex Ionescu

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