efi: Allow bitness-agnostic protocol calls
authorLukas Wunner <lukas@wunner.de>
Sat, 12 Nov 2016 21:32:35 +0000 (21:32 +0000)
committerIngo Molnar <mingo@kernel.org>
Sun, 13 Nov 2016 07:23:16 +0000 (08:23 +0100)
commit3552fdf29f01e5a889e88202dc55b67aa6766620
tree9056eaf32ecad1662fd1cd2af9c1762e0fba1f81
parent46cd4b75cd0edee76e0096225c2d31f8d90e92a2
efi: Allow bitness-agnostic protocol calls

We already have a macro to invoke boot services which on x86 adapts
automatically to the bitness of the EFI firmware:  efi_call_early().

The macro allows sharing of functions across arches and bitness variants
as long as those functions only call boot services.  However in practice
functions in the EFI stub contain a mix of boot services calls and
protocol calls.

Add an efi_call_proto() macro for bitness-agnostic protocol calls to
allow sharing more code across arches as well as deduplicating 32 bit
and 64 bit code paths.

On x86, implement it using a new efi_table_attr() macro for bitness-
agnostic table lookups.  Refactor efi_call_early() to make use of the
same macro.  (The resulting object code remains identical.)

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Andreas Noever <andreas.noever@gmail.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Jones <pjones@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20161112213237.8804-8-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/arm/include/asm/efi.h
arch/arm64/include/asm/efi.h
arch/x86/include/asm/efi.h