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platform: generic: thead: fix stale TLB entries for th1520/sg2042

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The TLB entries remain functional all the time once added in T-HEAD th1520
and Sophgo sg2042 (even if the MMU is then disabled afterwards). If there
are some stale TLB entries that contains the address of SBI, it will cause
unexpected memory access and issue a illegal instruction error. To avoid
this, a TLB flush is needed to drop these TLB entries before any memory
access in the trap handler.

To handle this workaroud, add a custom trap handler with executing TLB flush
first in the T-HEAD platform to fix affected socs.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Inochi Amaoto
2023-09-15 17:39:36 +08:00
committed by Anup Patel
parent b7e9d34edf
commit 3669153e06
5 changed files with 78 additions and 0 deletions
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4
platform/generic/Kconfig
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@@ -52,6 +52,10 @@ config PLATFORM_STARFIVE_JH7110
bool "StarFive JH7110 support"
default n
config PLATFORM_THEAD
bool "THEAD C9xx support"
default n
source "$(OPENSBI_SRC_DIR)/platform/generic/andes/Kconfig"
endif