mirror of
https://github.com/AsahiLinux/u-boot
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1ccf87165e
This adds support for new RISCV_EFI_BOOT_PROTOCOL to communicate the boot hart ID to bootloader/kernel on RISC-V UEFI platforms. The specification of the protocol is hosted at: https://github.com/riscv-non-isa/riscv-uefi Signed-off-by: Sunil V L <sunilvl@ventanamicro.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Defines APIs that allow an OS to interact with UEFI firmware to query
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* information about the boot hart ID.
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*
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* Copyright (c) 2022, Ventana Micro Systems Inc
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*/
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#define LOG_CATEGORY LOGC_EFI
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#include <common.h>
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#include <efi_loader.h>
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#include <efi_variable.h>
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#include <log.h>
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#include <asm/global_data.h>
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#include <efi_riscv.h>
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DECLARE_GLOBAL_DATA_PTR;
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static const efi_guid_t efi_guid_riscv_boot_protocol = RISCV_EFI_BOOT_PROTOCOL_GUID;
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/**
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* efi_riscv_get_boot_hartid() - return boot hart ID
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* @this: RISCV_EFI_BOOT_PROTOCOL instance
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* @boot_hartid: caller allocated memory to return boot hart id
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* Return: status code
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*/
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static efi_status_t EFIAPI
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efi_riscv_get_boot_hartid(struct riscv_efi_boot_protocol *this,
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efi_uintn_t *boot_hartid)
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{
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EFI_ENTRY("%p, %p", this, boot_hartid);
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if (this != &riscv_efi_boot_prot || !boot_hartid)
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return EFI_INVALID_PARAMETER;
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*boot_hartid = gd->arch.boot_hart;
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return EFI_EXIT(EFI_SUCCESS);
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}
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struct riscv_efi_boot_protocol riscv_efi_boot_prot = {
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.revision = RISCV_EFI_BOOT_PROTOCOL_REVISION,
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.get_boot_hartid = efi_riscv_get_boot_hartid
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};
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/**
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* efi_riscv_register() - register RISCV_EFI_BOOT_PROTOCOL
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*
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* Return: status code
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*/
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efi_status_t efi_riscv_register(void)
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{
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efi_status_t ret = EFI_SUCCESS;
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ret = efi_add_protocol(efi_root, &efi_guid_riscv_boot_protocol,
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(void *)&riscv_efi_boot_prot);
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if (ret != EFI_SUCCESS)
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log_err("Cannot install RISCV_EFI_BOOT_PROTOCOL\n");
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return ret;
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}
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