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lib: sbi_hart: reset mstateen0

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The current logic clears some bits based on SBI known extensions.
Be safe and do not leave enabled anything that SBI doesn't control.

This is not a breaking change, because the register must be initialized
to 0 by the ISA on reset, but it is better to not depend on it when we
don't need to.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Link: https://lore.kernel.org/r/20250429142549.3673976-8-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Radim Krčmář
2025-04-29 16:25:48 +02:00
committed by Anup Patel
parent 8c814b5c9b
commit dac15cb910
1 changed files with 1 additions and 1 deletions
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lib/sbi/sbi_hart.c
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@@ -89,7 +89,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
csr_write(CSR_HSTATUS, 0); csr_write(CSR_HSTATUS, 0);
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMSTATEEN)) { if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMSTATEEN)) {
mstateen_val = csr_read64(CSR_MSTATEEN0); mstateen_val = 0;
mstateen_val |= SMSTATEEN_STATEN; mstateen_val |= SMSTATEEN_STATEN;
mstateen_val |= SMSTATEEN0_CONTEXT; mstateen_val |= SMSTATEEN0_CONTEXT;
mstateen_val |= SMSTATEEN0_HSENVCFG; mstateen_val |= SMSTATEEN0_HSENVCFG;