The static memory footprint of a kernel Image at boot is larger than the
Image file itself. Things like .bss data and initial page tables are allocated
statically but populated dynamically so their content is not contained in the
Image file.
However, if EFI has loaded the Image at precisely the
Similar to how text offset and kernel size are mangled to produce little
endian constants for the Image header regardless of the endianness of the
kernel, this adds a number of constants used in the EFI PE/COFF header which
can only be calculated (and byte swapped) by the linker.
Signed-off-by:
The Image header contains many constants that should be emitted in little
endian regardless of the endianness of the kernel. Add helper macros le16,
le32 and le64 to asm/assembler.h to aid with this.
Signed-off-by: Ard Biesheuvel ard.biesheu...@linaro.org
---
arch/arm64/include/asm/assembler.h |
This series adds support for booting BE kernels from UEFI. As UEFI is defined to
be strictly little endian, some workarounds are required to combine a little
endian EFI stub with a big endian kernel. Also, runtime services need to be
wrapped so they can be executed in little endian mode.
Patches
After the EFI stub has done its business, it jumps into the kernel by branching
to offset #0 of the loaded Image, which is where it expects to find the header
containing a 'branch to stext' instruction.
However, the header is not covered by any PE/COFF section, so the header may
not actually be
This enables the UEFI Runtime Services needed to manipulate the
non-volatile variable store when running under a BE kernel.
Signed-off-by: Ard Biesheuvel ard.biesheu...@linaro.org
---
arch/arm64/include/asm/efi.h | 2 +
arch/arm64/kernel/efi-be-call.S| 55
Update the PE/COFF header to use explicit little endian constants and use
explicit little endian linker symbols so that the PE/COFF header is always
emitted in little endian regardless of the endiannes of the kernel.
Signed-off-by: Ard Biesheuvel ard.biesheu...@linaro.org
---
This changes the Kconfig logic to allow EFI to be enabled on a BE kernel build.
Signed-off-by: Ard Biesheuvel ard.biesheu...@linaro.org
---
arch/arm64/Kconfig | 10 +++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index
This adds support to boot a big endian kernel from UEFI firmware, which is
always little endian. The EFI stub itself is built as little endian, and
embedded into a big endian kernel image.
To enable this, we need to build all the stub's dependencies as little endian,
including FDT parsing code
On 17 July 2014 16:09, Mark Salter msal...@redhat.com wrote:
On Wed, 2014-07-16 at 23:13 +0200, Ard Biesheuvel wrote:
On 16 July 2014 23:03, Mark Salter msal...@redhat.com wrote:
On Wed, 2014-07-16 at 22:38 +0200, Ard Biesheuvel wrote:
On 16 July 2014 21:45, Mark Salter msal...@redhat.com
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