Re: [Xen-devel] Bare-metal Xen on ARM boot

[Sander Bogaert <sander.bogaert@xxxxxxxxx>]

On 25 April 2013 10:43, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>
> On Wed, 2013-04-24 at 10:39 +0100, Sander Bogaert wrote:
>
>
> > I attached the code ( it's very small).
>
> This:
> > .global hvcConsoleIO
> > hvcConsoleIO:
> >   PUSH {r12}
> >   MOV  r12, #3
> >   HVC  #0xEA1
> >   POP  {r12}
> >   BX   lr
>
> appears to be calling __HYPERVISOR_stack_switch which isn't a supported
> hypercall on ARM.
>
> Perhaps you wanted:
> #define __HYPERVISOR_console_io           18
> ?

I was getting the number from xen/arch/arm/traps.c:706 ''call =
arm_hypercall_table[regs->r12].fn;" and the arm_hypercall_table in the
same file. It should have been #4 by that reasoning I know.

>
> Also r12 is defined to be clobbered by any function call, so you don't
> really need to save it I don't think.
>
> The only thing you should need to save when making a hypercall is r4 and
> only if you are making a 5 argument hypercall.

Thanks, I'll change this.

>
>
> Ian.
>
>
>

Also, I was trying an ELF file. I will try again tomorrow with a
zImage header and report back.

Thanks,
Sander

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