[PATCH v5 2/6] RISC-V: Add a syscall for HW probing

[Evan Green]

On Wed, Apr 5, 2023 at 6:57 AM Paul Walmsley <paul at pwsan.com> wrote:
>
> On Mon, 27 Mar 2023, Evan Green wrote:
>
> > We don't have enough space for these all in ELF_HWCAP{,2} and there's no
> > system call that quite does this, so let's just provide an arch-specific
> > one to probe for hardware capabilities.  This currently just provides
> > m{arch,imp,vendor}id, but with the key-value pairs we can pass more in
> > the future.
> >
> > Co-developed-by: Palmer Dabbelt <palmer at rivosinc.com>
> > Signed-off-by: Palmer Dabbelt <palmer at rivosinc.com>
> > Signed-off-by: Evan Green <evan at rivosinc.com>
> > Reviewed-by: Conor Dooley <conor.dooley at microchip.com>
> > Reviewed-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
> > Tested-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
>
> Folks are already building RISC-V systems with cores that have different
> feature sets inside the same Linux system image - just like some ARM
> vendors are - so it makes sense to pass this information onto userspace.
>
> By the way, Evan, did you intend to update the copyright dates to include
> 2023?

Updated in v6.

>
> Beyond that,
>
> Reviewed-by: Paul Walmsley <paul.walmsley at sifive.com>

Thanks, Paul!
-Evan