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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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lib/sbi/sbi_init.c
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@@ -70,6 +70,7 @@ static void sbi_boot_prints(struct sbi_scratch *scratch, u32 hartid)
sbi_hart_get_features_str(scratch, str, sizeof(str));
sbi_printf("BOOT HART Features : %s\n", str);
sbi_printf("BOOT HART PMP Count : %d\n", sbi_hart_pmp_count(scratch));
sbi_printf("BOOT HART MHPM Count: %d\n", sbi_hart_mhpm_count(scratch));
/* Firmware details */
sbi_printf("Firmware Base : 0x%lx\n", scratch->fw_start);