[PATCH 5/8] lib: sbi_hart: fix sstateen emulation

From: "Radim Krčmář" <rkrcmar@ventanamicro.com>
To: opensbi@lists.infradead.org
Subject: [PATCH 5/8] lib: sbi_hart: fix sstateen emulation
Date: Tue, 15 Apr 2025 15:19:06 +0200	[thread overview]
Message-ID: <20250415131908.2699782-7-rkrcmar@ventanamicro.com> (raw)
In-Reply-To: <20250415131908.2699782-2-rkrcmar@ventanamicro.com>

The Sstateen extension defines 4 sstateen registers, but SBI currently
configures the execution environment to throw illegal instruction
exception when accessing sstateen1-3.

SBI should implement all sstateen registers, so delegate the
implementation to hardware by setting the SE bit.

Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
---
 lib/sbi/sbi_hart.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index c280c0b3e85e..b209f1cab27d 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -111,6 +111,9 @@ static void mstatus_init(struct sbi_scratch *scratch)
 			mstateen_val &= ~SMSTATEEN0_CTR;
 
 		csr_write64(CSR_MSTATEEN0, mstateen_val);
+		csr_write64(CSR_MSTATEEN1, SMSTATEEN_STATEN);
+		csr_write64(CSR_MSTATEEN2, SMSTATEEN_STATEN);
+		csr_write64(CSR_MSTATEEN3, SMSTATEEN_STATEN);
 
 		if (misa_extension('S'))
 			csr_write(CSR_SSTATEEN0, 0);
-- 
2.48.1


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