From: Anup Patel <apatel@ventanamicro.com>
To: opensbi@lists.infradead.org
Subject: [PATCH v2 6/6] lib: sbi: Do not enter OpenSBI with mseccfg.MML == 1
Date: Tue, 12 Dec 2023 15:29:26 +0530 [thread overview]
Message-ID: <20231212095926.13371-7-apatel@ventanamicro.com> (raw)
In-Reply-To: <20231212095926.13371-1-apatel@ventanamicro.com>
On platforms with Smepmp, the previous booting stage must enter
OpenSBI with mseccfg.MML == 0. This allows OpenSBI to configure
it's own M-mode only regions without depending on the previous
booting stage.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
lib/sbi/sbi_hart.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/lib/sbi/sbi_hart.c b/lib/sbi/sbi_hart.c
index 6acff37..16da38d 100644
--- a/lib/sbi/sbi_hart.c
+++ b/lib/sbi/sbi_hart.c
@@ -975,6 +975,16 @@ __pmp_skip:
/* Mark hart feature detection done */
hfeatures->detected = true;
+ /*
+ * On platforms with Smepmp, the previous booting stage must
+ * enter OpenSBI with mseccfg.MML == 0. This allows OpenSBI
+ * to configure it's own M-mode only regions without depending
+ * on the previous booting stage.
+ */
+ if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SMEPMP) &&
+ (csr_read(CSR_MSECCFG) & MSECCFG_MML))
+ return SBI_EILL;
+
return 0;
}
--
2.34.1
next prev parent reply other threads:[~2023-12-12 9:59 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-12 9:59 [PATCH v2 0/6] Assorted improvements Anup Patel
2023-12-12 9:59 ` [PATCH v2 1/6] lib: sbi_tlb: Reduce size of struct sbi_tlb_info Anup Patel
2023-12-12 9:59 ` [PATCH v2 2/6] platform: generic: Fine tune fw_platform_calculate_heap_size() Anup Patel
2023-12-12 9:59 ` [PATCH v2 3/6] lib: utils/irqchip: Add shared MMIO region for PLIC in root domain Anup Patel
2023-12-12 9:59 ` [PATCH v2 4/6] lib: sbi: Allow ecall handlers to directly update register state Anup Patel
2023-12-12 9:59 ` [PATCH v2 5/6] lib: sbi: Remove the SBI_ETRAP error code Anup Patel
2023-12-12 9:59 ` Anup Patel [this message]
2023-12-19 13:54 ` [PATCH v2 0/6] Assorted improvements Anup Patel
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