linux-toradex.git/arch/arm/include/asm/efi.h, branch v4.10

efi: Allow bitness-agnostic protocol calls

2016-11-13T07:23:16+00:00

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 
Signed-off-by: Matt Fleming 
Cc: Andreas Noever 
Cc: Ard Biesheuvel 
Cc: Linus Torvalds 
Cc: Peter Jones 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/20161112213237.8804-8-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

efi: Convert efi_call_virt() to efi_call_virt_pointer()

2016-06-27T11:06:56+00:00

This commit makes a few slight modifications to the efi_call_virt() macro
to get it to work with function pointers that are stored in locations
other than efi.systab->runtime, and renames the macro to
efi_call_virt_pointer().  The majority of the changes here are to pull
these macros up into header files so that they can be accessed from
outside of drivers/firmware/efi/runtime-wrappers.c.

The most significant change not directly related to the code move is to
add an extra "p" argument into the appropriate efi_call macros, and use
that new argument in place of the, formerly hard-coded,
efi.systab->runtime pointer.

The last piece of the puzzle was to add an efi_call_virt() macro back into
drivers/firmware/efi/runtime-wrappers.c to wrap around the new
efi_call_virt_pointer() macro - this was mainly to keep the code from
looking too cluttered by adding a bunch of extra references to
efi.systab->runtime everywhere.

Note that I also broke up the code in the efi_call_virt_pointer() macro a
bit in the process of moving it.

Signed-off-by: Alex Thorlton 
Signed-off-by: Matt Fleming 
Cc: Ard Biesheuvel 
Cc: Catalin Marinas 
Cc: Dimitri Sivanich 
Cc: Linus Torvalds 
Cc: Mark Rutland 
Cc: Peter Zijlstra 
Cc: Roy Franz 
Cc: Russ Anderson 
Cc: Russell King 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1466839230-12781-5-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

arm/efi: Enable runtime call flag checking

2016-04-28T09:34:12+00:00

Define ARCH_EFI_IRQ_FLAGS_MASK for arm, which will enable the generic
runtime wrapper code to detect when firmware erroneously modifies flags
over a runtime services function call.

We check all allocated flags, barring those which firmware has
legitimate reason to modify (condition flags and IT state). While in
practice corruption of some flags (e.g. J) would already be fatal, we
include these for consistency and documentation purposes.

Signed-off-by: Mark Rutland 
Signed-off-by: Matt Fleming 
Cc: Ard Biesheuvel 
Cc: Borislav Petkov 
Cc: Catalin Marinas 
Cc: Colin Ian King 
Cc: Leif Lindholm 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-39-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

arm/efi: Move to generic {__,}efi_call_virt()

2016-04-28T09:34:08+00:00

Now there's a common template for {__,}efi_call_virt(), remove the
duplicate logic from the ARM EFI code.

Signed-off-by: Mark Rutland 
Signed-off-by: Matt Fleming 
Reviewed-by: Ard Biesheuvel 
Cc: Borislav Petkov 
Cc: Catalin Marinas 
Cc: Colin Ian King 
Cc: Leif Lindholm 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-34-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

efifb: Enable the efi-framebuffer platform driver for ARM and arm64

2016-04-28T09:34:01+00:00

Allows the efifb driver to be built for ARM and arm64. This simply involves
updating the Kconfig dependency expression, and supplying dummy versions of
efifb_setup_from_dmi().

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Matt Fleming 
Cc: Borislav Petkov 
Cc: David Herrmann 
Cc: Mark Rutland 
Cc: Peter Jones 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-25-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

efi/arm/libstub: Make screen_info accessible to the UEFI stub

2016-04-28T09:33:59+00:00

In order to hand over the framebuffer described by the GOP protocol and
discovered by the UEFI stub, make struct screen_info accessible by the
stub. This involves allocating a loader data buffer and passing it to the
kernel proper via a UEFI Configuration Table, since the UEFI stub executes
in the context of the decompressor, and cannot access the kernel's copy of
struct screen_info directly.

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Matt Fleming 
Cc: Borislav Petkov 
Cc: David Herrmann 
Cc: Mark Rutland 
Cc: Peter Jones 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-22-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

efi/libstub: Move Graphics Output Protocol handling to generic code

2016-04-28T09:33:57+00:00

The Graphics Output Protocol code executes in the stub, so create a generic
version based on the x86 version in libstub so that we can move other archs
to it in subsequent patches. The new source file gop.c is added to the
libstub build for all architectures, but only wired up for x86.

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Matt Fleming 
Cc: Borislav Petkov 
Cc: David Herrmann 
Cc: Mark Rutland 
Cc: Peter Jones 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-18-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

ARM/efi: Apply strict permissions for UEFI Runtime Services regions

2016-04-28T09:33:53+00:00

Recent UEFI versions expose permission attributes for runtime services
memory regions, either in the UEFI memory map or in the separate memory
attributes table.  This allows the kernel to map these regions with
stricter permissions, rather than the RWX permissions that are used by
default. So wire this up in our mapping routine.

Signed-off-by: Ard Biesheuvel 
Signed-off-by: Matt Fleming 
Cc: Borislav Petkov 
Cc: Catalin Marinas 
Cc: Leif Lindholm 
Cc: Mark Rutland 
Cc: Peter Jones 
Cc: Peter Zijlstra 
Cc: Russell King 
Cc: Sai Praneeth Prakhya 
Cc: Thomas Gleixner 
Cc: Will Deacon 
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1461614832-17633-11-git-send-email-matt@codeblueprint.co.uk
Signed-off-by: Ingo Molnar

ARM: add UEFI stub support

2015-12-14T09:38:21+00:00

This patch adds EFI stub support for the ARM Linux kernel.

The EFI stub operates similarly to the x86 and arm64 stubs: it is a
shim between the EFI firmware and the normal zImage entry point, and
sets up the environment that the zImage is expecting. This includes
optionally loading the initrd and device tree from the system partition
based on the kernel command line.

Signed-off-by: Roy Franz 
Tested-by: Ryan Harkin 
Reviewed-by: Matt Fleming 
Signed-off-by: Ard Biesheuvel

ARM: wire up UEFI init and runtime support

2015-12-13T18:18:30+00:00

This adds support to the kernel proper for booting via UEFI. It shares
most of the code with arm64, so this patch mostly just wires it up for
use with ARM.

Note that this does not include the EFI stub, it is added in a subsequent
patch.

Tested-by: Ryan Harkin 
Reviewed-by: Matt Fleming 
Signed-off-by: Ard Biesheuvel