Re: [Xen-devel] [XenARM] Question about booting parameter of Mini-OS for ARM

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Mon, 6 May 2013, Chen Baozi wrote:
> On Mar 25, 2013, at 6:00 PM, Stefano Stabellini 
> <Stefano.Stabellini@xxxxxxxxxxxxx> wrote:
> 
> > On Sun, 24 Mar 2013, Chen Baozi wrote:
> >> Hi all,
> >> 
> >> I'm reading Mini-OS's codes and to estimate the amount of work porting it 
> >> to
> >> ARM (Ian's GSoC idea this year).
> >> 
> >> While Xen is booting Mini-OS on x86 platform, it passes the start_info_t to
> >> the guest through ESI register. And Mini-OS would use this structure as 
> >> the 
> >> argument of start_kernel. However, I didn't see codes handle the
> >> start_info_t on ARM side. Instead, I see a more standard protocal when
> >> booting ARM's dom0, which follows linux kernel bootstrap rules:
> >> 
> >>    r0 = 0, r1 = machine nr, r2 = atags or dtb pointer
> >> 
> >> Does it mean that Xen for ARM does not use the start_info_t to pass
> >> information when booting PV guest? 
> >> Or did I miss something important?
> > 
> > That's right, we don't use start_info_t on ARM, in fact ARM guests are
> > not exactly like x86 PV guests.
> > The information present in the start_info page are either available via
> > device tree or no used on ARM.
> 
> I'm thinking of parsing the dtb and fill the start_info structure according 
> to it before jump to the start_kernel. In that case, it won't break some 
> original mini-os interface.

You can try that, or you can refactor the code dividing it into x86
specific and common stuff.

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