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lib: sbi_hart: fix sstateen emulation

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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.

Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Radim Krčmář <rkrcmar@ventanamicro.com>
Link: https://lore.kernel.org/r/20250429142549.3673976-7-rkrcmar@ventanamicro.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Radim Krčmář
2025-04-29 16:25:47 +02:00
committed by Anup Patel
parent 6b877fb53b
commit 8c814b5c9b
1 changed files with 3 additions and 0 deletions
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3
lib/sbi/sbi_hart.c
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@@ -111,6 +111,9 @@ static void mstatus_init(struct sbi_scratch *scratch)
mstateen_val &= ~SMSTATEEN0_CTR; mstateen_val &= ~SMSTATEEN0_CTR;
csr_write64(CSR_MSTATEEN0, mstateen_val); 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')) if (misa_extension('S'))
csr_write(CSR_SSTATEEN0, 0); csr_write(CSR_SSTATEEN0, 0);