[PATCH 6/8] lib: sbi_hart: reset mstateen0

From: "Radim Krčmář" <rkrcmar@ventanamicro.com>
To: opensbi@lists.infradead.org
Subject: [PATCH 6/8] lib: sbi_hart: reset mstateen0
Date: Tue, 15 Apr 2025 15:19:07 +0200	[thread overview]
Message-ID: <20250415131908.2699782-8-rkrcmar@ventanamicro.com> (raw)
In-Reply-To: <20250415131908.2699782-2-rkrcmar@ventanamicro.com>

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.

Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
---
 lib/sbi/sbi_hart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index b209f1cab27d..569f8008b523 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -89,7 +89,7 @@ static void mstatus_init(struct sbi_scratch *scratch)
 		csr_write(CSR_HSTATUS, 0);
 
 	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 |= SMSTATEEN0_CONTEXT;
 		mstateen_val |= SMSTATEEN0_HSENVCFG;
-- 
2.48.1


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