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riscv: Add support for kernel mode vector

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Add kernel_vector_begin() and kernel_vector_end() function declarations
and corresponding definitions in kernel_mode_vector.c

These are needed to wrap uses of vector in kernel mode.

Co-developed-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Vincent Chen <vincent.chen@sifive.com>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
Signed-off-by: Andy Chiu <andy.chiu@sifive.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Tested-by: Björn Töpel <bjorn@rivosinc.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20240115055929.4736-2-andy.chiu@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Greentime Hu
2024-01-15 05:59:20 +00:00
committed by Palmer Dabbelt
parent b85ea95d08
commit ecd2ada8a5
6 changed files with 182 additions and 1 deletions
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1
arch/riscv/kernel/process.c
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@@ -221,6 +221,7 @@ int copy_thread(struct task_struct *p, const struct kernel_clone_args *args)
childregs->a0 = 0; /* Return value of fork() */
p->thread.s[0] = 0;
}
p->thread.riscv_v_flags = 0;
p->thread.ra = (unsigned long)ret_from_fork;
p->thread.sp = (unsigned long)childregs; /* kernel sp */
return 0;