lkml.org 
[lkml]   [2015]   [Mar]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v5 1/9] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC
Hi Mark,

On 03/06/2015 09:18 PM, Chanwoo Choi wrote:
> Hi,
>
> On 03/06/2015 08:40 PM, Mark Rutland wrote:

[snip]

>>
>>>>>>>> I take it CPUs boot at EL2?
>>>>>>
>>>>>> Do the CPUs boot at EL1 or EL2?
>>>>>
>>>>> Unfortunately, I cannot check the secure firmware for Exynos5433 SoC.
>>>>> I think that a few SoC provider probably would know it.
>>>>
>>>> I guess I asked the wrong question.
>>>>
>>>> Do CPUs enter the kernel at EL2 or at EL1?
>>>
>>> Could you give me a tip how to check the kernel at EL2 or EL1?
>>
>> Hmm... I thought we logged this but it looks like we don't.
>>
>> You could hack in a check of is_hyp_mode_available() and
>> is_hyp_mode_mismatched(). That will tell you if EL2/hyp is available,
>> and whether all CPUs enter at the same mode (mandatory per the boot
>> protocol).
>
> OK, I'll try it.

I check the return value of is_hyp_mode_available() to catch whether EL1 or EL2.

The is_hyp_mode_available() returns 'false' during kernel booting.
- __boot_cpu_mode[0]: 0xe11 (BOOT_CPU_MODE_EL1)
- __boot_cpu_mode[1]: 0x0

Best Regards,
Chanwoo Choi





\
 
 \ /
  Last update: 2015-03-10 02:41    [W:0.082 / U:0.208 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site