On 18/05/2022 10:25, Hongren (Zenithal) Zheng wrote: > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe > > userspace currently lacks a way to detect whether the > platform has Bitmanip/Scalar Crypto capability, > this commit provides a way such that the userspace > can detect it. > > RISC-V currently still has no mature mechanism, > but no matter how things in the spec changes, > (no matter how "M" mode things change), the kernel > still needs to offer some API to the userspace. > > More discussion can be found at > https://github.com/openssl/openssl/pull/18197 > Userspace currently has to use env var to detect them. > > This commit along does not assume any specific mechanism > below kernel. s/along/alone? But I think you could rewrite this sentence to make it clearer, I had to read it more than once to see if that was actually a typo or not. Possibly swap "This commit" for "This interface" or similar, both here and in the first paragraph. Maybe something like: "This interface does not make any assumptions about the underlying hardware" Thanks, Conor. > > Tested-by: Jiatai He <jiatai2021@xxxxxxxxxxx> > Signed-off-by: Hongren (Zenithal) Zheng <i@xxxxxxxxxxx> > --- > arch/riscv/include/uapi/asm/hwcap.h | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/arch/riscv/include/uapi/asm/hwcap.h b/arch/riscv/include/uapi/asm/hwcap.h > index 46dc3f5ee99f..bfed3e5c338c 100644 > --- a/arch/riscv/include/uapi/asm/hwcap.h > +++ b/arch/riscv/include/uapi/asm/hwcap.h > @@ -22,4 +22,26 @@ > #define COMPAT_HWCAP_ISA_D (1 << ('D' - 'A')) > #define COMPAT_HWCAP_ISA_C (1 << ('C' - 'A')) > > +/* > + * HWCAP2 flags - for elf_hwcap2 (in kernel) and AT_HWCAP2 > + * > + * As only 32 bits of elf_hwcap (in kernel) could be used > + * and RISC-V has reserved 26 bits of it, other caps like > + * bitmanip and crypto can not be placed in AT_HWCAP > + */ > +#define COMPAT_HWCAP2_ISA_ZBA (1 << 0) > +#define COMPAT_HWCAP2_ISA_ZBB (1 << 1) > +#define COMPAT_HWCAP2_ISA_ZBC (1 << 2) > +#define COMPAT_HWCAP2_ISA_ZBS (1 << 3) > +#define COMPAT_HWCAP2_ISA_ZBKB (1 << 4) > +#define COMPAT_HWCAP2_ISA_ZBKC (1 << 5) > +#define COMPAT_HWCAP2_ISA_ZBKX (1 << 6) > +#define COMPAT_HWCAP2_ISA_ZKND (1 << 7) > +#define COMPAT_HWCAP2_ISA_ZKNE (1 << 8) > +#define COMPAT_HWCAP2_ISA_ZKNH (1 << 9) > +#define COMPAT_HWCAP2_ISA_ZKSED (1 << 10) > +#define COMPAT_HWCAP2_ISA_ZKSH (1 << 11) > +#define COMPAT_HWCAP2_ISA_ZKR (1 << 12) > +#define COMPAT_HWCAP2_ISA_ZKT (1 << 13) > + > #endif /* _UAPI_ASM_RISCV_HWCAP_H */ > -- > 2.35.1 > > > _______________________________________________ > linux-riscv mailing list > linux-riscv@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-riscv
