Atish Patra 5b305e30a5 lib: sbi: Only enable TM bit in scounteren ...

The S-mode should disable Cycle and instruction counter for user space
to avoid side channel attacks. The Linux kernel already does this so that
any random user space code shouldn't be able to monitor cycle/instruction
without higher privilege mode involvement.

Remove the CY/IR bits in scountern in OpenSBI.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Atish Patra <atishp@rivosinc.com>
Link: https://lore.kernel.org/r/20250513-fix_scounteren-v1-1-01018e0c0b0a@rivosinc.com
Signed-off-by: Anup Patel <anup@brainfault.org>

2025-07-21 16:33:03 +05:30

..

sbi

lib: sbi: Only enable TM bit in scounteren

2025-07-21 16:33:03 +05:30

utils

lib: utils/serial: Clear LSR status and check RBR status

2025-07-20 20:37:18 +05:30