[PATCH v4 2/3] riscv: Add SPL_ZERO_MEM_BEFORE_USE implementation

[Leo Liang]

On Wed, Aug 09, 2023 at 09:11:32PM +0800, Shengyu Qu wrote:
> Add the actual support code for SPL_ZERO_MEM_BEFORE_USE and remove
> existing Starfive JH7110's L2 LIM clean code, since existing code has
> following issues:
>  1. Each hart (in the middle of a function call) overwriting its own
>     stack and other harts' stacks.
>     (data-race and data-corruption)
>  2. Lottery winner hart can be doing "board_init_f_init_reserve",
>     while other harts are in the middle of zeroing L2 LIM.
>     (data-race)
> 
> Signed-off-by: Bo Gan <ganboing at gmail.com>
> Signed-off-by: Shengyu Qu <wiagn233 at outlook.com>
> ---
> Changes since v2:
>  - Fix typo (ZERO_MEM_BEFORE_USE to SPL_ZERO_MEM_BEFORE_USE)
> Changes since v3:
>  - Revert v3's fix since original implementation is actually right
> ---
>  arch/riscv/cpu/jh7110/spl.c | 25 -------------------------
>  arch/riscv/cpu/start.S      | 12 ++++++++++++
>  common/init/board_init.c    |  3 +++
>  3 files changed, 15 insertions(+), 25 deletions(-)

Reviewed-by: Leo Yu-Chi Liang <ycliang at andestech.com>