[PATCH 0/3] RISC-V: Export Zba, Zbb to usermode via hwprobe

[Evan Green <evan@rivosinc.com>]

This change detects the presence of Zba and Zbb extensions and exports
them per-hart to userspace via the hwprobe mechanism. Glibc can then use
these in setting up hwcaps-based library search paths.

There's a little bit of extra housekeeping here: the first change adds
Zba to the set of extensions the kernel recognizes, and the second
change starts tracking ISA features per-hart (in addition to the ANDed
mask of features across all harts which the kernel uses to make
decisions). Now that we track the ISA information per-hart, we could
even fix up /proc/cpuinfo to accurately report extension per-hart,
though I've left that out of this series for now.


Evan Green (3):
  RISC-V: Add Zba extension probing
  RISC-V: Track ISA extensions per hart
  RISC-V: hwprobe: Expose Zba and Zbb

 Documentation/riscv/hwprobe.rst       |  7 +++++
 arch/riscv/include/asm/cpufeature.h   | 10 +++++++
 arch/riscv/include/asm/hwcap.h        |  1 +
 arch/riscv/include/uapi/asm/hwprobe.h |  2 ++
 arch/riscv/kernel/cpu.c               |  1 +
 arch/riscv/kernel/cpufeature.c        | 19 ++++++++----
 arch/riscv/kernel/sys_riscv.c         | 43 ++++++++++++++++++++++-----
 7 files changed, 70 insertions(+), 13 deletions(-)

-- 
2.25.1


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