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riscv: set trap vector earlier

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[ Upstream commit 6ad8735994 ]

The exception vector of the booting hart is not set before enabling
the mmu and then still points to the value of the previous firmware,
typically _start. That makes it hard to debug setup_vm() when bad
things happen. So fix that by setting the exception vector earlier.

Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: yang.zhang <yang.zhang@hexintek.com>
Link: https://lore.kernel.org/r/20240508022445.6131-1-gaoshanliukou@163.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
yang.zhang 2024-05-08 10:24:45 +08:00 committed by Greg Kroah-Hartman
parent 124451bbc2
commit ce2e63804a
1 changed files with 3 additions and 0 deletions
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3
arch/riscv/kernel/head.S
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@ -305,6 +305,9 @@ clear_bss_done:
#else
mv a0, a1
#endif /* CONFIG_BUILTIN_DTB */
/* Set trap vector to spin forever to help debug */
la a3, .Lsecondary_park
csrw CSR_TVEC, a3
call setup_vm
#ifdef CONFIG_MMU
la a0, early_pg_dir