[PATCH v3 05/62] acpi: Don't do traditional BIOS table scan for ARM64

[Stefano Stabellini]

On Tue, 17 Nov 2015, shannon.zhao at linaro.org wrote:
> From: Shannon Zhao <shannon.zhao at linaro.org>
> 
> With the addition of ARM64 that does not have a traditional BIOS to
> scan, add a #ifdef option for x86 to do the traditional BIOS scanning
> for tables.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
> ---
>  xen/drivers/acpi/osl.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/xen/drivers/acpi/osl.c b/xen/drivers/acpi/osl.c
> index ce15470..db74a90 100644
> --- a/xen/drivers/acpi/osl.c
> +++ b/xen/drivers/acpi/osl.c
> @@ -78,7 +78,9 @@ acpi_physical_address __init acpi_os_get_root_pointer(void)
>  	} else {
>  		acpi_physical_address pa = 0;
>  
> +		#ifdef CONFIG_X86
>  		acpi_find_root_pointer(&pa);
> +		#endif
>  		return pa;
>  	}

I think it might be best to error out earlier if acpi and !efi_enabled
on arm and arm64.  If we do that we'll never enter this "else".

If acpi_find_root_pointer doesn't build on arm, we should move it to an
x86 specific location, such as xen/arch/x86/efi.