[PATCH 1/5] bloblist: add API to check the register conventions

[Ilias Apalodimas]

Hi Raymond,

On Tue, 19 Dec 2023 at 23:11, Raymond Mao <raymond.mao at linaro.org> wrote:
>
> Add bloblist_check_reg_conv() to check whether the bloblist is compliant
> to the register conventions defined in Firmware Handoff specification.
> This API can be used for all Arm platforms.
>
> Signed-off-by: Raymond Mao <raymond.mao at linaro.org>
> ---
>  common/bloblist.c  | 15 +++++++++++++++
>  include/bloblist.h | 12 ++++++++++++
>  2 files changed, 27 insertions(+)
>
> diff --git a/common/bloblist.c b/common/bloblist.c
> index 625e480f6b..232ca4c6ce 100644
> --- a/common/bloblist.c
> +++ b/common/bloblist.c
> @@ -542,3 +542,18 @@ int bloblist_maybe_init(void)
>
>         return 0;
>  }
> +
> +int bloblist_check_reg_conv(ulong rfdt, ulong rzero)
> +{
> +       ulong fdt;
> +
> +       if (!IS_ENABLED(CONFIG_OF_BOARD))
> +               return 0;
> +
> +       fdt = (ulong)bloblist_find(BLOBLISTT_CONTROL_FDT, 0);
> +
> +       if (rfdt != fdt || rzero != 0)
> +               return -EIO;

What is rzero supposed to be doing here? If its only valid value is !0
why arent we checking it earlier?

Thanks
/Ilias
> +
> +       return 0;
> +}
> diff --git a/include/bloblist.h b/include/bloblist.h
> index 84fc943819..b5d0f147f6 100644
> --- a/include/bloblist.h
> +++ b/include/bloblist.h
> @@ -461,4 +461,16 @@ static inline int bloblist_maybe_init(void)
>  }
>  #endif /* BLOBLIST */
>
> +/**
> + * bloblist_check_reg_conv() - Check whether the bloblist is compliant to
> + *                            the register conventions according to the
> + *                            Firmware Handoff spec.
> + *
> + * @rfdt:  Register that holds the FDT base address.
> + * @rzero: Register that must be zero.
> + * Return: 0 if OK, -EIO if the bloblist is not compliant to the register
> + *        conventions.
> + */
> +int bloblist_check_reg_conv(ulong rfdt, ulong rzero);
> +
>  #endif /* __BLOBLIST_H */
> --
> 2.25.1
>