diff options
Diffstat (limited to 'lib/sbi/sbi_hart.c')
| -rw-r--r-- | lib/sbi/sbi_hart.c | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c index 8a98d4d..a4e9bf5 100644 --- a/lib/sbi/sbi_hart.c +++ b/lib/sbi/sbi_hart.c @@ -56,20 +56,13 @@ static void mstatus_init(struct sbi_scratch *scratch) sbi_hart_has_feature(scratch, SBI_HART_HAS_SCOUNTEREN)) csr_write(CSR_SCOUNTEREN, 7); - if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTEREN)) { - if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT)) - /** - * Just enable the default counters (CY, TM, IR) because - * some OS (e.g FreeBSD) expect them to be enabled. - * - * All other counters will be enabled at runtime after - * S-mode request. - */ - csr_write(CSR_MCOUNTEREN, 7); - else - /* Supervisor mode usage are enabled by default */ - csr_write(CSR_MCOUNTEREN, -1); - } + /** + * OpenSBI doesn't use any PMU counters in M-mode. + * Supervisor mode usage for all counters are enabled by default + * But counters will not run until mcountinhibit is set. + */ + if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTEREN)) + csr_write(CSR_MCOUNTEREN, -1); /* All programmable counters will start running at runtime after S-mode request */ if (sbi_hart_has_feature(scratch, SBI_HART_HAS_MCOUNTINHIBIT)) |