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This patch add a brief documentation of the userspace interface in
regard to the RISC-V Vector extension.
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Greentime Hu <greentime.hu@sifive.com>
Reviewed-by: Vincent Chen <vincent.chen@sifive.com>
Co-developed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20230605110724.21391-26-andy.chiu@sifive.com

Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>