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RISC-V: Add a syscall for HW probing
We don't have enough space for these all in ELF_HWCAP{,2} and there's no
system call that quite does this, so let's just provide an arch-specific
one to probe for hardware capabilities. This currently just provides
m{arch,imp,vendor}id, but with the key-value pairs we can pass more in
the future.
Co-developed-by: 
Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: 
Evan Green <evan@rivosinc.com>
Reviewed-by: 
Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: 
Heiko Stuebner <heiko.stuebner@vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner@vrull.eu>
Reviewed-by: 
Paul Walmsley <paul.walmsley@sifive.com>
Link: https://lore.kernel.org/r/20230407231103.2622178-3-evan@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
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- Documentation/riscv/hwprobe.rst 41 additions, 0 deletionsDocumentation/riscv/hwprobe.rst
- Documentation/riscv/index.rst 1 addition, 0 deletionsDocumentation/riscv/index.rst
- arch/riscv/include/asm/hwprobe.h 13 additions, 0 deletionsarch/riscv/include/asm/hwprobe.h
- arch/riscv/include/asm/syscall.h 4 additions, 0 deletionsarch/riscv/include/asm/syscall.h
- arch/riscv/include/uapi/asm/hwprobe.h 25 additions, 0 deletionsarch/riscv/include/uapi/asm/hwprobe.h
- arch/riscv/include/uapi/asm/unistd.h 9 additions, 0 deletionsarch/riscv/include/uapi/asm/unistd.h
- arch/riscv/kernel/sys_riscv.c 134 additions, 1 deletionarch/riscv/kernel/sys_riscv.c
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