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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

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
?

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.

Ian.




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