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We currently have two implementations of UEFI variables: * variables provided via an OP-TEE module * variables stored in the U-Boot environment Read only variables are up to now only implemented in the U-Boot environment implementation. Provide a common interface for both implementations that allows handling read-only variables. As variable access is limited to very few source files put variable related definitions into new include efi_variable.h instead of efi_loader. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
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*/
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#ifndef _EFI_VARIABLE_H
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#define _EFI_VARIABLE_H
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#include <linux/bitops.h>
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#define EFI_VARIABLE_READ_ONLY BIT(31)
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/**
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* efi_get_variable() - retrieve value of a UEFI variable
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*
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* @variable_name: name of the variable
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* @vendor: vendor GUID
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* @attributes: attributes of the variable
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* @data_size: size of the buffer to which the variable value is copied
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* @data: buffer to which the variable value is copied
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* @timep: authentication time (seconds since start of epoch)
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* Return: status code
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*/
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efi_status_t efi_get_variable_int(u16 *variable_name, const efi_guid_t *vendor,
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u32 *attributes, efi_uintn_t *data_size,
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void *data, u64 *timep);
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/**
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* efi_set_variable() - set value of a UEFI variable
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*
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* @variable_name: name of the variable
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* @vendor: vendor GUID
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* @attributes: attributes of the variable
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* @data_size: size of the buffer with the variable value
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* @data: buffer with the variable value
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* @ro_check: check the read only read only bit in attributes
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* Return: status code
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*/
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efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
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u32 attributes, efi_uintn_t data_size,
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const void *data, bool ro_check);
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#endif
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