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lib: sbi: Detect and print MHPM counters at boot-time

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A RISC-V platform can leave unimplemented MHPM counters hard-wired
to zero. We extend hart_detect_features() to detect MHPM counters
which are accessible and not hard-wired to zero. We also print
number of available MHPM counters as part of boot prints.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-08-19 17:31:37 +05:30
committed by Anup Patel
parent 74d1db7062
commit 2c341f7844
3 changed files with 19 additions and 0 deletions
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include/sbi/sbi_hart.h
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@@ -35,6 +35,7 @@ static inline ulong sbi_hart_expected_trap_addr(void)
return (ulong)sbi_hart_expected_trap;
}
unsigned int sbi_hart_mhpm_count(struct sbi_scratch *scratch);
void sbi_hart_delegation_dump(struct sbi_scratch *scratch);
unsigned int sbi_hart_pmp_count(struct sbi_scratch *scratch);
int sbi_hart_pmp_get(struct sbi_scratch *scratch, unsigned int n,