Anup Patel ebc8ebc0f8 lib: sbi: Improve HPM CSR read/write emulation ...

We improve HPM CSR read/write emulation as follows:
1. Fail for unimplemented counters so that trap is redirected
   to S-mode which can further help debugging S-mode software.
2. Check permissions in both MCOUNTEREN and SCOUNTEREN for
   HS-mode and U-mode.
3. Don't check permissions for TIME CSR because we emulate
   TIME CSR for both Host (HS/U-mode) and Guest (VS/VU-mode).
   Also, faster TIME CSR read is very helpful for good
   performance of S-mode software.
4. Don't emulate S-mode CSR read/write to M-mode HPM CSRs
   because these should not be accessible to S-mode software.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>

2020-09-01 10:28:35 +05:30

..

sbi

lib: sbi: Improve HPM CSR read/write emulation

2020-09-01 10:28:35 +05:30

utils

lib: sbi: Remove redundant SBI_HART_HAS_PMP feature

2020-09-01 10:28:26 +05:30