Re: [PATCH for-7.1 3/4] target/loongarch: rename the TCG CPU "la464" to "qemu64-v1.00"

[chen huacai]

Hi, Richard and Xuerui,

On Mon, Aug 15, 2022 at 4:54 AM Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 8/14/22 09:55, WANG Xuerui wrote:
> > From: WANG Xuerui <git@xen0n.name>
> >
> > The only LoongArch CPU implemented is modeled after the Loongson 3A5000,
> > but it is not the real thing, ...
>
> The 3A5000 is the SoC, as far as I could find, and the documentation of that 
> says the core
> is named the la464.
>
>
> > In general, high-fidelity models can and should be named after the real
> > hardware model, while generic emulation-oriented models should be named
> > after ISA levels.
>
> This wasn't intended to be a generic emulation model, as far as I know.  
> There are missing
> features, but presumably those would eventually be filled in.
>
>
> > For now, the best reference for LoongArch ISA levels
> > is the revision number of the LoongArch ISA Manual, of which v1.00 is
> > still the latest. (v1.01 and v1.02 are minor revisions without
> > substantive change.)
> >
> > As defined by various specs, the vendor and model names are also
> > reflected in respective CSRs, and are 8 bytes long. So, rename "la464"
> > to "qemu64-v1.00", with "QEMU64" as vendor name and "v1.00" as model
> > name.
>
> Eh, I suppose.  I'm not really keen on this though, as I would presume there 
> will be
> eventual forward progress on completing the real cpu model.  We simply won't 
> give any
> compatibility guarantees for loongarch until we are ready to do so.
In my opinion, real cpu name (Loongson-3A5000, Loongson-3A6000, etc.)
and generic qemu emulated name (qemu64-v1.00, qemu64-v2.00, vx.xx is
the ISA level, I found this style is used for x86) are both
acceptable. But la464 is not a good cpu name, because la264 and la464
are in the same ISA level, while la664 will be in a new level.

Huacai

>
>
> r~
>


-- 
Huacai Chen