Parse the device tree for Zkr in the isa string.
If Zkr is present, use it to seed the kernel base address.
On an ACPI system, as of this commit, there is no easy way to check if
Zkr is present. Blindly running the instruction isn't an option as;
we have to be able to trust the firmware.
Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Zong Li <zong.li@sifive.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240709173937.510084-5-jesse@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Add pi.h header for declarations of the kernel/pi prefixed functions
and any other related declarations.
Suggested-by: Charlie Jenkins <charlie@rivosinc.com>
Signed-off-by: Jesse Taube <jesse@rivosinc.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Link: https://lore.kernel.org/r/20240709173937.510084-4-jesse@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
