linux-kernel - Re: [PATCH v2 05/10] MIPS: Refactor mips_cps_core

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Date: Fri, 22 Dec 2023 12:40:39 +0000
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
 gregory.clement@...tlin.com, vladimir.kondratiev@...el.com
Subject: Re: [PATCH v2 05/10] MIPS: Refactor mips_cps_core_entry
 implementation



在 2023/12/22 12:18, Thomas Bogendoerfer 写道:
> On Fri, Oct 27, 2023 at 11:11:01PM +0100, Jiaxun Yang wrote:
>> Now the exception vector for CPS systems are allocated on-fly
>> with memblock as well.
>>
>> It will try to allocate from KSEG1 first, and then try to allocate
>> in low 4G if possible.
>>
>> The main reset vector is now generated by uasm, to avoid tons
>> of patches to the code. Other vectors are copied to the location
>> later.
> this patch does way to many things in one go. What is needed to
> make a kernel working with an ebase anyware in XPHYS ?

As we have some silly restrictions on the placement of CPS reset_base, it's
impossible to put CPS's cluster reset base "anywhere".

You'll have to make entry code in cps-vec.S relocatable to allow it to 
be moved
by kernel at run time. Either patching the code or generate by uasm.

Thanks
- Jiaxun
>
> Thomas.
>