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lib: sbi: enable seed access in S-mode

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If ISA extension Zkr is available, set

    mseccfg.sseed=1
    mseccfg.useed=0

This enables access to the seed CSR in S-mode but not in U-mode.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Heinrich Schuchardt
2023-10-29 00:49:59 +02:00
committed by Anup Patel
parent efcac338bd
commit 6e5b0cfb45
1 changed files with 6 additions and 0 deletions
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6
lib/sbi/sbi_hart.c
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@@ -160,6 +160,12 @@ static void mstatus_init(struct sbi_scratch *scratch)
}
csr_write(CSR_MENVCFG, menvcfg_val);
/* Enable S-mode access to seed CSR */
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_ZKR)) {
csr_set(CSR_MSECCFG, MSECCFG_SSEED);
csr_clear(CSR_MSECCFG, MSECCFG_USEED);
}
}
/* Disable all interrupts */