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@@ -0,0 +1,60 @@
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+// 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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+
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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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+
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+DECLARE_GLOBAL_DATA_PTR;
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+
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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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+/**
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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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+
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+ if (this != &riscv_efi_boot_prot || !boot_hartid)
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+ return EFI_INVALID_PARAMETER;
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+
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+ *boot_hartid = gd->arch.boot_hart;
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+
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+ return EFI_EXIT(EFI_SUCCESS);
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+}
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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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+/**
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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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+
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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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