Messages in this thread | | | Date | Wed, 15 Feb 2023 10:56:51 +0100 | From | "Arnd Bergmann" <> | Subject | Re: [PATCH v2 2/6] RISC-V: Add a syscall for HW probing |
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On Mon, Feb 6, 2023, at 21:14, 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@rivosinc.com> > Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com> > Signed-off-by: Evan Green <evan@rivosinc.com>
I'm not sure I understand the problem with AT_HWCAP. While the bits in AT_HWCAP and AT_HWCAP2 are limited, I don't see us running out of new AT_* words to use for additional bits. Presumably the kernel would already have to know about the name of each supported HW feature and could assign a unique bit number to them.
Arnd
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