This series adds support for booting the 32-bit ARM kernel directly from UEFI firmware using a builtin UEFI stub. It mostly reuses refactored arm64 code, and the differences (primarily the PE/COFF header and entry point and the efi_create_mapping() implementation) are split out into arm64 and ARM versions. Changes since v2: - Some issues pointed out by Russell and Matt that were not introduced by this series but merely became apparent due to the code movement in patch #4 have been addressed in a separate 2-piece series I sent out this morning. This v3 is rebased on top of those patches. - Added a patch (#9) that adds support for creating non-global mappings. This addresses a concern raised by Russell in response to v2 where the use of global mappings combined with a flawed context switch and TBL flush sequence could result in memory corruption. - Rebased onto v4.4-rc2 Changes since v1: - The primary difference between this version and the first one is that all prerequisites have either been merged, dropped for now (early FDT handling) or folded into this series (MEMBLOCK_NOMAP). IOW, this series can be applied on top of v4.4-rc1 directly. - Dropped handling of UEFI permission bits. The reason is that the UEFIv2.5 approach (EFI_PROPERTIES_TABLE) is flawed, and will be replaced by something better in the next version of the spec. Patch #1 adds support for the MEMBLOCK_NOMAP attribute to the generic memblock code. Its purpose is to annotate memory regions as normal memory even if they are removed from the kernel direct mapping. Patch #2 implements MEMBLOCK_NOMAP support for arm64 Patch #3 updates the EFI init code to remove UEFI reserved regions and regions used by runtime services from the kernel direct mapping Patch #4 splits off most of arch/arm64/kernel/efi.c into arch agnostic files arm-init.c and arm-runtime.c under drivers/firmware/efi. Patch #5 refactors the code split off in patch #1 to isolate the arm64 specific pieces, and change a couple of arm64-isms that ARM handles slightly differently. Patch #6 enables the generic early_ioremap and early_memremap implementations for ARM. It reuses the kmap fixmap region, which is not used that early anyway. Patch #7 splits off the core functionality of create_mapping() into a new function __create_mapping() that we can reuse for mapping UEFI runtime regions. Patch #8 factors out the early_alloc() routine so we can invoke __create_mapping using another (late) allocator. Patch #9 adds support to __create_mapping() for creating non-global translation table entries. (new in v3) Patch #10 implements create_mapping_late() that uses a late allocator. Patch #11 implements MEMBLOCK_NOMAP support for ARM Patch #12 implements the UEFI support in the kernel proper to probe the UEFI memory map and map the runtime services. Patch #13 ties together all of the above, by implementing the UEFI stub, and introducing the Kconfig symbols that allow all of this to be built. Instructions how to build and run the 32-bit ARM UEFI firmware can be found here: https://wiki.linaro.org/LEG/UEFIforQEMU Ard Biesheuvel (12): mm/memblock: add MEMBLOCK_NOMAP attribute to memblock memory table arm64: only consider memblocks with NOMAP cleared for linear mapping arm64/efi: mark UEFI reserved regions as MEMBLOCK_NOMAP arm64/efi: split off EFI init and runtime code for reuse by 32-bit ARM arm64/efi: refactor EFI init and runtime code for reuse by 32-bit ARM ARM: add support for generic early_ioremap/early_memremap ARM: split off core mapping logic from create_mapping ARM: factor out allocation routine from __create_mapping() ARM: add support for non-global kernel mappings ARM: implement create_mapping_late() for EFI use ARM: only consider memblocks with NOMAP cleared for linear mapping ARM: wire up UEFI init and runtime support Roy Franz (1): ARM: add UEFI stub support arch/arm/Kconfig | 20 ++ arch/arm/boot/compressed/Makefile | 4 +- arch/arm/boot/compressed/efi-header.S | 130 ++++++++ arch/arm/boot/compressed/head.S | 54 +++- arch/arm/boot/compressed/vmlinux.lds.S | 7 + arch/arm/include/asm/Kbuild | 1 + arch/arm/include/asm/efi.h | 83 +++++ arch/arm/include/asm/fixmap.h | 29 +- arch/arm/include/asm/mach/map.h | 2 + arch/arm/include/asm/mmu_context.h | 2 +- arch/arm/kernel/Makefile | 1 + arch/arm/kernel/efi.c | 38 +++ arch/arm/kernel/setup.c | 10 +- arch/arm/mm/init.c | 5 +- arch/arm/mm/ioremap.c | 9 + arch/arm/mm/mmu.c | 128 +++++--- arch/arm64/include/asm/efi.h | 9 + arch/arm64/kernel/efi.c | 342 ++------------------ arch/arm64/mm/init.c | 2 +- arch/arm64/mm/mmu.c | 2 + drivers/firmware/efi/Makefile | 4 + drivers/firmware/efi/arm-init.c | 209 ++++++++++++ drivers/firmware/efi/arm-runtime.c | 135 ++++++++ drivers/firmware/efi/efi.c | 2 + drivers/firmware/efi/libstub/Makefile | 9 + drivers/firmware/efi/libstub/arm-stub.c | 4 +- drivers/firmware/efi/libstub/arm32-stub.c | 85 +++++ include/linux/memblock.h | 8 + mm/memblock.c | 28 ++ 29 files changed, 990 insertions(+), 372 deletions(-) create mode 100644 arch/arm/boot/compressed/efi-header.S create mode 100644 arch/arm/include/asm/efi.h create mode 100644 arch/arm/kernel/efi.c create mode 100644 drivers/firmware/efi/arm-init.c create mode 100644 drivers/firmware/efi/arm-runtime.c create mode 100644 drivers/firmware/efi/libstub/arm32-stub.c -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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