Re: [PATCH 2/6] arm/efi: Allow invocation of arbitrary runtime services [ver #2]

From: David Howells
Date: Wed Nov 23 2016 - 06:47:25 EST

Mark Rutland <mark.rutland@xxxxxxx> wrote:

> Any reason to not Cc LAKML?

Probably not.

> On Wed, Nov 23, 2016 at 12:22:43AM +0000, David Howells wrote:
> > Provide the ability to perform mixed-mode runtime service calls for arm in
> > the same way that commit 0a637ee61247bd4bed9b2a07568ef7a1cfc76187
> > ("x86/efi: Allow invocation of arbitrary boot services") provides the
> > ability to invoke arbitrary boot services.
> I'm not sure I understand. On arm/arm64, "mixed-mode" simply isn't possible.
> I see we already call runtime services directly in efi_get_secureboot()
> in drivers/firmware/efi/libstub/arm-stub.c.
> If this is just to provide a consistent API for the stub, please note
> that.

How about:

arm/efi: Allow invocation of arbitrary runtime services

efi_call_runtime() is provided for x86 to be able abstract mixed mode
support. Provide this for ARM also so that common code work in mixed mode