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[V3,0/1] RISCV_EFI_BOOT_PROTOCOL support in linux

Message ID 20220324115438.210390-1-sunilvl@ventanamicro.com
Headers show
Series RISCV_EFI_BOOT_PROTOCOL support in linux | expand

Message

Sunil V L March 24, 2022, 11:54 a.m. UTC 
This patch adds support for getting the boot hart ID using new
RISCV_EFI_BOOT_PROTOCOL in linux efi stub. While there is an existing
solution of passing the boot hart ID through Device Tree, it doesn't work for
ACPI. Hence an EFI protocol protocol is recommended which works for both DT and ACPI
based platforms.

The frozen spec of this new protocol is available at
https://github.com/riscv-non-isa/riscv-uefi/releases/download/1.0-rc3/RISCV_UEFI_PROTOCOL-spec.pdf

This is tested in qemu with both u-boot and edk2.

Changes since V2:
  - Updated error message

Changes since V1:
  - Rebased to get the "Fix get_boot_hartid_from_fdt() return value"
    patch
  - Removed mixed_mode member
  - Separated return value and status.


Sunil V L (1):
  riscv/efi_stub: Add support for RISCV_EFI_BOOT_PROTOCOL

 drivers/firmware/efi/libstub/efistub.h    |  7 ++++++
 drivers/firmware/efi/libstub/riscv-stub.c | 29 +++++++++++++++++++----
 include/linux/efi.h                       |  1 +
 3 files changed, 32 insertions(+), 5 deletions(-)