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| -rw-r--r-- | Documentation/arch/riscv/hwprobe.rst | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/arch/riscv/hwprobe.rst b/Documentation/arch/riscv/hwprobe.rst index 85b709257918..ea4e0b9c73e7 100644 --- a/Documentation/arch/riscv/hwprobe.rst +++ b/Documentation/arch/riscv/hwprobe.rst @@ -274,3 +274,19 @@ The following keys are defined: represent the highest userspace virtual address usable. * :c:macro:`RISCV_HWPROBE_KEY_TIME_CSR_FREQ`: Frequency (in Hz) of `time CSR`. + +* :c:macro:`RISCV_HWPROBE_KEY_MISALIGNED_VECTOR_PERF`: An enum value describing the + performance of misaligned vector accesses on the selected set of processors. + + * :c:macro:`RISCV_HWPROBE_MISALIGNED_VECTOR_UNKNOWN`: The performance of misaligned + vector accesses is unknown. + + * :c:macro:`RISCV_HWPROBE_MISALIGNED_VECTOR_SLOW`: 32-bit misaligned accesses using vector + registers are slower than the equivalent quantity of byte accesses via vector registers. + Misaligned accesses may be supported directly in hardware, or trapped and emulated by software. + + * :c:macro:`RISCV_HWPROBE_MISALIGNED_VECTOR_FAST`: 32-bit misaligned accesses using vector + registers are faster than the equivalent quantity of byte accesses via vector registers. + + * :c:macro:`RISCV_HWPROBE_MISALIGNED_VECTOR_UNSUPPORTED`: Misaligned vector accesses are + not supported at all and will generate a misaligned address fault. |