[RFC PATCH 0/5] Add UEFI support for RISC-V

[Atish Patra]

This series adds UEFI support for RISC-V. Currently, only boot time
services have been added. Runtime services will be added in a separate
series. This series depends on some core EFI patches
present in current in efi-next and following other patches.

U-Boot: Adds the boot hartid under chosen node.
https://lists.denx.de/pipermail/u-boot/2020-February/401227.html

Linux kernel: SBI v0.2 and HSM extension support. This series is a mandatory
pre-requisite for UEFI support as only single core can boot EFI stub and
Linux via UEFI. All other cores are brought up using SBI HSM extension.
http://lists.infradead.org/pipermail/linux-riscv/2020-February/008513.html

OpenSBI: master (commit: ge3f69fc1e934)

Patch 1 just moves arm-stub code to a generic code so that it can be used
across different architecture.

Patch 3 adds fixmap bindings so that CONFIG_EFI can be compiled and we do not
have create separate config to enable boot time services. 
As runtime services are not enabled at this time, full generic early ioremap
support is also not added in this series.

Patch 4 and 5 adds the PE/COFF header and EFI stub code support for RISC-V
respectively.

The patches can also be found in following git repo.

https://github.com/atishp04/linux/tree/wip_uefi_riscv

The patches have been verified on Qemu using bootefi command in U-Boot.
Here is a boot log.

Atish Patra (5):
efi: Move arm-stub to a common file
include: pe.h: Add RISC-V related PE definition
RISC-V: Define fixmap bindings for generic early ioremap support
RISC-V: Add PE/COFF header for EFI stub
RISC-V: Add EFI stub support.

arch/arm/Kconfig                              |   2 +-
arch/arm64/Kconfig                            |   2 +-
arch/riscv/Kconfig                            |  21 +++
arch/riscv/Makefile                           |   1 +
arch/riscv/configs/defconfig                  |   1 +
arch/riscv/include/asm/Kbuild                 |   2 +-
arch/riscv/include/asm/fixmap.h               |  21 ++-
arch/riscv/include/asm/io.h                   |   1 +
arch/riscv/include/asm/sections.h             |  13 ++
arch/riscv/kernel/Makefile                    |   4 +
arch/riscv/kernel/efi-header.S                | 107 ++++++++++++++
arch/riscv/kernel/head.S                      |  15 ++
arch/riscv/kernel/image-vars.h                |  52 +++++++
arch/riscv/kernel/vmlinux.lds.S               |  27 +++-
drivers/firmware/efi/Kconfig                  |   6 +-
drivers/firmware/efi/libstub/Makefile         |  20 ++-
.../efi/libstub/{arm-stub.c => efi-stub.c}    |   7 +-
drivers/firmware/efi/libstub/riscv-stub.c     | 135 ++++++++++++++++++
include/linux/pe.h                            |   3 +
19 files changed, 420 insertions(+), 20 deletions(-)
create mode 100644 arch/riscv/include/asm/sections.h
create mode 100644 arch/riscv/kernel/efi-header.S
create mode 100644 arch/riscv/kernel/image-vars.h
rename drivers/firmware/efi/libstub/{arm-stub.c => efi-stub.c} (98%)
create mode 100644 drivers/firmware/efi/libstub/riscv-stub.c

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2.24.0