[PATCH 09/17] ARM: add atag32_to_cpu() function

[Nicolas Pitre]

On Fri, 8 Feb 2013, Ben Dooks wrote:

> Add atag32_to_cpu() function to allow code manipulating ATAGs to deal
> with the case where the boot-loader was in little-endian and Linux is
> running big-endian.
> 
> Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>

Acked-by: Nicolas Pitre <nico at linaro.org>

> ---
>  arch/arm/include/uapi/asm/setup.h |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/include/uapi/asm/setup.h b/arch/arm/include/uapi/asm/setup.h
> index 979ff40..d74a417 100644
> --- a/arch/arm/include/uapi/asm/setup.h
> +++ b/arch/arm/include/uapi/asm/setup.h
> @@ -175,13 +175,18 @@ struct tagtable {
>  
>  #define tag_member_present(tag,member)				\
>  	((unsigned long)(&((struct tag *)0L)->member + 1)	\
> -		<= (tag)->hdr.size * 4)
> +		<= atag32_to_cpu((tag)->hdr.size) * 4)
>  
> -#define tag_next(t)	((struct tag *)((__u32 *)(t) + (t)->hdr.size))
> +#define tag_next(t)	((struct tag *)((__u32 *)(t) + atag32_to_cpu((t)->hdr.size)))
>  #define tag_size(type)	((sizeof(struct tag_header) + sizeof(struct type)) >> 2)
>  
>  #define for_each_tag(t,base)		\
>  	for (t = base; t->hdr.size; t = tag_next(t))
>  
> +#ifdef CONFIG_CPU_BE8_BOOT_LE
> +#define atag32_to_cpu(x)	le32_to_cpu(x)
> +#else
> +#define atag32_to_cpu(x)	x
> +#endif
>  
>  #endif /* _UAPI__ASMARM_SETUP_H */
> -- 
> 1.7.10.4
> 
> 
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