[PATCH v3 5/9] arm: armv8: save boot arguments

[Simon Glass]

On Fri, Dec 22, 2023 at 9:32 PM Raymond Mao <raymond.mao at linaro.org> wrote:
>
> Save boot arguments x[0-3] into an array for handover of bloblist from
> previous boot stage.
>
> Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
> ---
> Changes in v2
> - New patch file created for v2.
>
>  arch/arm/cpu/armv8/start.S | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>

Reviewed-by: Simon Glass <sjg at chromium.org>

> diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
> index 6cc1d26e5e..8e704f590e 100644
> --- a/arch/arm/cpu/armv8/start.S
> +++ b/arch/arm/cpu/armv8/start.S
> @@ -370,5 +370,19 @@ ENTRY(c_runtime_cpu_setup)
>  ENDPROC(c_runtime_cpu_setup)
>
>  WEAK(save_boot_params)
> +#if (IS_ENABLED(CONFIG_OF_BOARD) && IS_ENABLED(CONFIG_BLOBLIST))
> +       adr x9, saved_args
> +       stp x0, x1, [x9]
> +       /* Increment the address by 16 bytes for the next pair of values */

That seems obvious, but I suppose a comment here is fine.

> +       stp x2, x3, [x9, #16]
> +#endif
>         b       save_boot_params_ret    /* back to my caller */
>  ENDPROC(save_boot_params)
> +
> +.section .data
> +.global saved_args
> +saved_args:
> +       .rept 4
> +       .xword 0
> +       .endr
> +END(saved_args)
> --
> 2.25.1
>

Regards,
Simon