[PATCH v2 00/12] UEFI boot and runtime services support for 32-bit ARM
Ard Biesheuvel
ard.biesheuvel at linaro.org
Mon Nov 16 10:32:25 PST 2015
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 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 implements create_mapping_late() that uses a late allocator.
Patch #10 implements MEMBLOCK_NOMAP support for ARM
Patch #11 implements the UEFI support in the kernel proper to probe the UEFI
memory map and map the runtime services.
Patch #12 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 (11):
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: 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 | 90 ++++++
arch/arm/include/asm/fixmap.h | 29 +-
arch/arm/include/asm/mach/map.h | 1 +
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 | 110 ++++---
arch/arm64/include/asm/efi.h | 16 +
arch/arm64/kernel/efi.c | 331 ++------------------
arch/arm64/mm/init.c | 2 +-
arch/arm64/mm/mmu.c | 2 +
drivers/firmware/efi/Makefile | 4 +
drivers/firmware/efi/arm-init.c | 197 ++++++++++++
drivers/firmware/efi/arm-runtime.c | 134 ++++++++
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 ++
28 files changed, 975 insertions(+), 356 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
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