forked from Mirrors/opensbi
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>
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@@ -20,8 +20,10 @@ enum sbi_hart_features {
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SBI_HART_HAS_MCOUNTEREN = (1 << 1),
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/** Hart has counter inhibit CSR */
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SBI_HART_HAS_MCOUNTINHIBIT = (1 << 2),
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/** Hart has sscofpmf extension */
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SBI_HART_HAS_SSCOFPMF = (1 << 3),
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/** HART has timer csr implementation in hardware */
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SBI_HART_HAS_TIME = (1 << 3),
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SBI_HART_HAS_TIME = (1 << 4),
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/** Last index of Hart features*/
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SBI_HART_HAS_LAST_FEATURE = SBI_HART_HAS_TIME,
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