This patch series adds EFI stub support for the ARM architecture. The stub for ARM is implemented in a similar manner to x86 in that it is a shim layer between EFI and the normal zImage/bzImage boot process, and that an image with the stub configured is bootable as both a zImage and EFI application. This patch depends on Leif Lindholm's v7 runtime services patchset, which in turn depends on Mark Salter's early_io_remap() patchset. This EFI stub patchset can be tested without those by simply modifying the Kconfig for EFI_STUB to not depend on EFI. The kernel will boot using the stub, however no EFI support will be available in the kernel. Updated versions of these other patchsets should be posted in the near future. Changes since v4: * Common and x86 EFI stub changes that this patch depends on were merged in 3.13. * Updated FDT bindings to match agreed upon bindings in Leif's runtime services patchset. This includes adding the kernel_banner version string, and changing how the EFI memory map is passed. The EFI memory map is now allocated as EFI_RUNTIME_SERVICES_DATA since it may be passed to the kernel. The FDT bindings for arm/arm64 are identical. * Added space in PE/COFF header for signature to allow signing of the image for EFI secure boot. * Moved shared FDT function to drivers/firmware/efi/fdt.c. This will be shared with arm64. (Mark Salter has a patchset for the arm64 stub.) Changes since v3: * Common and x86 EFI stub changes have been broken out and submitted separately. This patch series depends on the "[PATCH V5 00/18] ARM EFI stub common code" series as merged by Matt Fleming. (Patch 10 of that series omitted) * Re-added -fno-stack-protector. Needed for compilation with CONFIG_CC_STACKPROTECTOR option. Cannot easily add support for stack protection since there are no functions in stub that never return, which is a requirement for use. (x86 stub also disables stack protector.) Note that even in the absense of -fno-stack-protector, stack protection was never present in the decompressor, as the required functions are not implemented. * Fixed long summaries in commit messages. * Further cleanups of assembly in head.S Changes since v2: * Now depends on "arm: Add [U]EFI runtime services support" patches by leif.lindholm@xxxxxxxxxx. The EFI memory map is the only memory map passed to the kernel, so EFI support is now required. * remove "-fno-stack-protector" from decompressor Makefile. The current code doesn't trigger the stack protection, so the decompressor now compiles with it still on. Note that there has never been any stack protection in the decompressor since the stack usage doesn't trigger the heuristic in GCC, so right now the "-fno-stack-protector" is a noop. * Changed EFI command line handling to not have a fixed limit. * Change FDT memory allocation to retry with a larger allocation if first educated guess is inadequate. * Correctly set 'SizeOfCode' in PE/COFF header. * Reviewed ".setup" section that is in x86 PE/COFF header. This is used for x86 to account for code that is not in the .text section. We don't need this for ARM, as all of our code is in the .text section, or in the PE/COFF header itself. * Moved EFI_STUB_ERROR #define to header file to share between stub C and ASM. * Variety of cleanups and fixes in head.S. * Changed update_fdt_and_exit_boot() to just update the device tree, and renamed appropriately. Memory allocations moved out of this function as well, which enables the retries if the initial FDT size is too small. Note that in order to do the retried allocations, the original FDT and command line memory regions are left allocated. This is OK since the kernel has the memory map and will free these allocations along with the initrd and new fdt allocations. * Added prefix to all prints, reduced number of prints, and reviewed all messages. * Change mixed usage of dtb/fdt to all be fdt or "device tree" in efi-stub.c * remove unnecessary zimage_size variable from relocate_kernel() * correct return types on EFI functions - should be efi_status_t, not int. Roy Franz (6): efi-stub.txt updates for ARM Add shared update_fdt() function for ARM/ARM64 Add strstr to compressed string.c for ARM. Add EFI stub for ARM Disable stack protection for decompressor/stub Add config EFI_STUB for ARM to Kconfig Documentation/efi-stub.txt | 27 ++- arch/arm/Kconfig | 10 ++ arch/arm/boot/compressed/Makefile | 17 +- arch/arm/boot/compressed/efi-header.S | 117 +++++++++++++ arch/arm/boot/compressed/efi-stub.c | 291 ++++++++++++++++++++++++++++++++ arch/arm/boot/compressed/efi-stub.h | 5 + arch/arm/boot/compressed/head.S | 83 ++++++++- arch/arm/boot/compressed/string.c | 21 +++ drivers/firmware/efi/efi-stub-helper.c | 9 +- drivers/firmware/efi/fdt.c | 115 +++++++++++++ 10 files changed, 678 insertions(+), 17 deletions(-) create mode 100644 arch/arm/boot/compressed/efi-header.S create mode 100644 arch/arm/boot/compressed/efi-stub.c create mode 100644 arch/arm/boot/compressed/efi-stub.h create mode 100644 drivers/firmware/efi/fdt.c -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-efi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
