[U-Boot] [PATCH v7 3/9] armv8: Add Secure Monitor/Hypervisor Call (SMC/HVC) infrastructure

[Michal Simek <michal.simek@xilinx.com>]

On 6.1.2016 14:04, Mateusz Kulikowski wrote:
> On 14.10.2015 18:55, Sergey Temerkhanov wrote:
>> This commit adds functions issuing calls to secure monitor or
>> hypervisore. This allows using services such as Power State
>> Coordination Interface (PSCI) provided by firmware, e.g. ARM
>> Trusted Firmware (ATF)
> 
>> The SMC call can destroy all registers declared temporary by the
>> calling conventions. The clobber list is "x0..x17" because of
>> this
> 
>> Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com>
>> Signed-off-by: Corey Minyard <cminyard@mvista.com>
>> Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
>> Reviewed-by: Simon Glass <sjg@chromium.org>
> 
> +1 (I may need it as well)
> 
> Tested-by: Mateusz Kulikowski <mateusz.kulikowski@gmail.com>
> 
> Tested on: Hikey
> Methodology:
> 
> Hacked smc handler in arm trusted firmware (x0=x0+x1, x1=x2+x3, x2=x4+x5, x3=x6+2)
> +new u-boot command (smc/hvc) using functions from this patch;
> 
> I didn't tested hvc code (would need to make some fake hypervisor), but it's basically the same.
> 
> Idea: perhaps after this series is merged we can add 2 new commands to u-boot (SMC/HVC) to 
> play with hypervisors/secure monitors (and perhaps use some simple functionality if needed).

How this should look like?

Definitely I would like to see this code in mainline because we have
code which needs to call SMCs.

Thanks,
Michal