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Re: [Xen-devel] [PATCH] efi/libstub/fdt: Standardize the names of EFI stub parameters
- To: "Ian Campbell" <ian.campbell@xxxxxxxxxx>
- From: "Jan Beulich" <JBeulich@xxxxxxxx>
- Date: Thu, 10 Sep 2015 07:08:50 -0600
- Cc: Mark Rutland <mark.rutland@xxxxxxx>, "devicetree@xxxxxxxxxxxxxxx" <devicetree@xxxxxxxxxxxxxxx>, "matt.fleming@xxxxxxxxx" <matt.fleming@xxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "daniel.kiper@xxxxxxxxxx" <daniel.kiper@xxxxxxxxxx>, "ard.biesheuvel@xxxxxxxxxx" <ard.biesheuvel@xxxxxxxxxx>, "linux-doc@xxxxxxxxxxxxxxx" <linux-doc@xxxxxxxxxxxxxxx>, "peter.huangpeng@xxxxxxxxxx" <peter.huangpeng@xxxxxxxxxx>, "leif.lindholm@xxxxxxxxxx" <leif.lindholm@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, "julien.grall@xxxxxxxxxx" <julien.grall@xxxxxxxxxx>, "freebsd-arm@xxxxxxxxxxx" <freebsd-arm@xxxxxxxxxxx>, "linux-efi@xxxxxxxxxxxxxxx" <linux-efi@xxxxxxxxxxxxxxx>, "shannon.zhao@xxxxxxxxxx" <shannon.zhao@xxxxxxxxxx>, Shannon Zhao <zhaoshenglong@xxxxxxxxxx>, "christoffer.dall@xxxxxxxxxx" <christoffer.dall@xxxxxxxxxx>, "linux-arm-kernel@xxxxxxxxxxxxxxxxxxx" <linux-arm-kernel@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 10 Sep 2015 13:09:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
>>> On 10.09.15 at 14:58, <ian.campbell@xxxxxxxxxx> wrote:
> On Thu, 2015-09-10 at 13:15 +0100, Mark Rutland wrote:
>
>> > In any case this should be separate from the shim ABI discussion.
>>
>> I disagree; I think this is very much relevant to the ABI discussion.
>> That's not to say that I insist on a particular approach, but I think
>> that they need to be considered together.
>
> Taking a step back, the reason for using the EFI stub parameters is only
> (AFAIK) in order to be able to locate the ACPI RDSP (the root table
> pointer), which as it happens is normally passed via one of the EFI
> firmware tables.
>
> If there was a way to achieve that goal (i.e. another way to find the RSDP)
> without opening the can of UEFI worms then we could consider that opiton
> too.
>
> a way != the legacy x86 thing of scanning low memory of the signature, of
> course.
But even x86 doesn't do that (other than as a fallback) on EFI. The
configuration table is available to Dom0 (via XENPF_firmware_info:
XEN_FW_EFI_INFO:XEN_FW_EFI_CONFIG_TABLE).
Jan
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