@@ -20,8 +20,10 @@ enum sbi_hart_features {
SBI_HART_HAS_MCOUNTEREN = (1 << 1),
/** Hart has counter inhibit CSR */
SBI_HART_HAS_MCOUNTINHIBIT = (1 << 2),
+ /** Hart has sscofpmf extension */
+ SBI_HART_HAS_SSCOF = (1 << 3),
/** HART has timer csr implementation in hardware */
- SBI_HART_HAS_TIME = (1 << 3),
+ SBI_HART_HAS_TIME = (1 << 4),
/** Last index of Hart features*/
SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_TIME,
@@ -288,6 +288,9 @@ static inline char *sbi_hart_feature_id2string(unsigned long feature)
case SBI_HART_HAS_MCOUNTINHIBIT:
fstr = "mcountinhibit";
break;
+ case SBI_HART_HAS_SSCOF:
+ fstr = "sscof";
+ break;
case SBI_HART_HAS_TIME:
fstr = "time";
break;
@@ -497,6 +500,15 @@ __mhpm_skip:
hfeatures->features |= SBI_HART_HAS_MCOUNTINHIBIT;
}
+ /* Counter overflow/filtering is not useful without mcounter/inhibit */
+ if (hfeatures->features & SBI_HART_HAS_MCOUNTINHIBIT &&
+ hfeatures->features & SBI_HART_HAS_MCOUNTEREN) {
+ /* Detect if hart supports sscofpmf */
+ csr_read_allowed(CSR_SCOUNTOVF, (unsigned long)&trap);
+ if (!trap.cause)
+ hfeatures->features |= SBI_HART_HAS_SSCOF;
+ }
+
/* Detect if hart supports time CSR */
csr_read_allowed(CSR_TIME, (unsigned long)&trap);
if (!trap.cause)