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
