linux-kernel - [RFC PATCH V2 0/1] RISCV_EFI_BOOT

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Date:   Thu,  3 Mar 2022 20:29:43 +0530
From:   Sunil V L <sunilvl@...tanamicro.com>
To:     Ard Biesheuvel <ardb@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Cc:     Atish Patra <atishp@...osinc.com>,
        Anup Patel <apatel@...tanamicro.com>,
        Abner Chang <abner.chang@....com>,
        Jessica Clarke <jrtc27@...c27.com>, linux-efi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH V2 0/1] RISCV_EFI_BOOT_PROTOCOL support in linux

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 latest draft spec of this new protocol is available at
https://github.com/riscv-non-isa/riscv-uefi/releases/download/1.0-rc2/RISCV_UEFI_PROTOCOL-spec.pdf

This linux ptach can be found in:
riscv_boot_protocol_rfc_v2 branch at
https://github.com/vlsunil/linux.git

This is tested in qemu with u-boot 2022.04.rc3.

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(-)

-- 
2.25.1