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| author | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-19 14:34:40 -0700 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-19 14:34:40 -0700 |
| commit | 16252e018a30486eedcfec81fc313445cac25bea (patch) | |
| tree | 5cddc30da8c3b5c7c71bceb8f90c219d018c5a85 /Documentation/riscv | |
| parent | f20233852ae295fde59c9a28c4a2087d693de3fb (diff) | |
| parent | c0baf321038d5fa4273c0dc495d78f39848dd8fc (diff) | |
Merge patch series "RISC-V: Export Zba, Zbb to usermode via hwprobe"
Evan Green <evan@rivosinc.com> says:
This change detects the presence of Zba, Zbb, and Zbs 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 and Zbs 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.
* b4-shazam-merge:
RISC-V: hwprobe: Expose Zba, Zbb, and Zbs
RISC-V: Track ISA extensions per hart
RISC-V: Add Zba, Zbs extension probing
Link: https://lore.kernel.org/r/20230509182504.2997252-1-evan@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'Documentation/riscv')
| -rw-r--r-- | Documentation/riscv/hwprobe.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/riscv/hwprobe.rst b/Documentation/riscv/hwprobe.rst index 7431d9d01c73..19165ebd82ba 100644 --- a/Documentation/riscv/hwprobe.rst +++ b/Documentation/riscv/hwprobe.rst @@ -67,6 +67,16 @@ The following keys are defined: * :c:macro:`RISCV_HWPROBE_IMA_V`: The V extension is supported, as defined by version 1.0 of the RISC-V Vector extension manual. + * :c:macro:`RISCV_HWPROBE_EXT_ZBA`: The Zba address generation extension is + supported, as defined in version 1.0 of the Bit-Manipulation ISA + extensions. + + * :c:macro:`RISCV_HWPROBE_EXT_ZBB`: The Zbb extension is supported, as defined + in version 1.0 of the Bit-Manipulation ISA extensions. + + * :c:macro:`RISCV_HWPROBE_EXT_ZBS`: The Zbs extension is supported, as defined + in version 1.0 of the Bit-Manipulation ISA extensions. + * :c:macro:`RISCV_HWPROBE_KEY_CPUPERF_0`: A bitmask that contains performance information about the selected set of processors. |