Re: [Xen-devel] [PATCH v2 11/35] xen/arm64: head: Document enable_mmu()

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Mon, 22 Jul 2019, Julien Grall wrote:
> Document the behavior and the main registers usage within enable_mmu().
> 
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>

Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>


> ---
>     Changes in v2:
>         - x2 and x3 are also clobbers. Update the comment accordingly
>         - s/ID/1:1/
> ---
>  xen/arch/arm/arm64/head.S | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/xen/arch/arm/arm64/head.S b/xen/arch/arm/arm64/head.S
> index eddf663021..63563ef5e3 100644
> --- a/xen/arch/arm/arm64/head.S
> +++ b/xen/arch/arm/arm64/head.S
> @@ -576,6 +576,13 @@ virtphys_clash:
>          ret
>  ENDPROC(create_page_tables)
>  
> +/*
> + * Turn on the Data Cache and the MMU. The function will return on the 1:1
> + * mapping. In other word, the caller is responsible to switch to the runtime
> + * mapping.
> + *
> + * Clobbers x0 - x3
> + */
>  enable_mmu:
>          PRINT("- Turning on paging -\r\n")
>  
> -- 
> 2.11.0
> 

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