From 867c65360df283f056afa963ad8333e9c1eb21bb Mon Sep 17 00:00:00 2001
From: Atish Patra <atish.patra@wdc.com>
Date: Mon, 8 Nov 2021 10:52:58 -0800
Subject: lib: sbi: Detect Sscofpmf extension at run time
Sscofpmf ISA extension introduces PMU counter overflow and filtering support.
It introduces a read only `scountovf` csr that can be used to detect if
a hart supports this extension at runtime. However, this feature is only
useful if the hart already supports mcounteren and mcountinhibit.
Add a dynamic detection mechanism and boot time print message if sscofpmf
is present.
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Atish Patra <atish.patra@wdc.com>
---
include/sbi/sbi_hart.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
(limited to 'include')
diff --git a/include/sbi/sbi_hart.h b/include/sbi/sbi_hart.h
index 0c18ef9..d2db9d6 100644
--- a/include/sbi/sbi_hart.h
+++ b/include/sbi/sbi_hart.h
@@ -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_SSCOFPMF = (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,
--
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