RE: [Xen-devel] Domain0/Domain 1 and ring1 (x86) - tracing question

["Petersson, Mats" <mats.petersson@xxxxxxx>]

There's a #define in arch-x86_32.h that defines FLAT_KERNEL_[CDS]S to
FLAT_RING1_[CDS]S. FLAT_RING1_[CDS]S is the entry in GDT for a CPL=1
(ring 1) code/data/stack[1] segment selector. 
It is then used in various places to set up the registers used by the
actual kernel, for example the file
linux-2.6-xen-sparse/include/asm-xen/asm-i386/segment.h is using the
KERNEL_CS to give the BOOT_CS to the Linux kernel. 

[1] Stack segment is actually using the same selector as the data
segment. 

--
Mats

> -----Original Message-----
> From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of John Que
> Sent: 16 August 2005 11:59
> To: xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-devel] Domain0/Domain 1 and ring1 (x86) - 
> tracing question
> 
> Hello,
> As I understand the Hypervisor should run in Ring 0 of the 
> x86 , and the domains (Domain0 and DomainU) should work in Ring 1. 
> 
> I was a bit curious where in the code this assiging of Ring 0 
> to Xen and Ring 1 to dom0/domU is done ?
> I had tried to look under arch/xen/i386 and didn't find.
> 
> Is it in the assembler *.S files ?
> 
> Regards,
> John
> 
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> http://lists.xensource.com/xen-devel
> 


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