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

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Message-Id: <20220126110615.33371-1-sunilvl@ventanamicro.com>
Date:   Wed, 26 Jan 2022 16:36:14 +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>
Cc:     linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org,
        Heinrich Schuchardt <xypron.glpk@....de>,
        Anup Patel <apatel@...tanamicro.com>,
        Atish Patra <atishp@...osinc.com>,
        Abner Chang <abner.chang@....com>,
        Jessica Clarke <jrtc27@...c27.com>,
        Sunil V L <sunilvl@...tanamicro.com>
Subject: [RFC PATCH 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_v1 branch at https://github.com/vlsunil/linux.git

This is tested in qemu with both u-boot and edk2 firmware changes. To test this
patch with u-boot, we need u-boot to support this new protocol which can be
found in:
riscv_boot_protocol_rfc_v1 branch at https://github.com/vlsunil/u-boot.git

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

 drivers/firmware/efi/libstub/efistub.h    | 15 ++++++++++++
 drivers/firmware/efi/libstub/riscv-stub.c | 28 ++++++++++++++++++++---
 include/linux/efi.h                       |  1 +
 3 files changed, 41 insertions(+), 3 deletions(-)

-- 
2.25.1