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riscv: hwprobe: Document thead vendor extensions and xtheadvector extension 

Document support for thead vendor extensions using the key
RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0 and xtheadvector extension using
the key RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Evan Green <evan@rivosinc.com>
Tested-by: Yangyu Chen <cyy@cyyself.name>
Link: https://lore.kernel.org/r/20241113-xtheadvector-v11-11-236c22791ef9@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
pull/1137/head
Charlie Jenkins 2024-11-13 18:21:17 -08:00 committed by Palmer Dabbelt
parent a5ea53da65
commit 7fa00fd6ff
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10
Documentation/arch/riscv/hwprobe.rst
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@ -293,3 +293,13 @@ The following keys are defined:
* :c:macro:`RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED`: Misaligned vector accesses are
not supported at all and will generate a misaligned address fault.
* :c:macro:`RISCV_HWPROBE_KEY_VENDOR_EXT_THEAD_0`: A bitmask containing the
thead vendor extensions that are compatible with the
:c:macro:`RISCV_HWPROBE_BASE_BEHAVIOR_IMA`: base system behavior.
* T-HEAD
* :c:macro:`RISCV_HWPROBE_VENDOR_EXT_XTHEADVECTOR`: The xtheadvector vendor
extension is supported in the T-Head ISA extensions spec starting from
commit a18c801634 ("Add T-Head VECTOR vendor extension. ").