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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#ifndef _EFI_VARIABLE_H
#define _EFI_VARIABLE_H
#include <linux/bitops.h>
#define EFI_VARIABLE_READ_ONLY BIT(31)
/**
* efi_get_variable() - retrieve value of a UEFI variable
*
* @variable_name: name of the variable
* @vendor: vendor GUID
* @attributes: attributes of the variable
* @data_size: size of the buffer to which the variable value is copied
* @data: buffer to which the variable value is copied
* @timep: authentication time (seconds since start of epoch)
* Return: status code
*/
efi_status_t efi_get_variable_int(u16 *variable_name, const efi_guid_t *vendor,
u32 *attributes, efi_uintn_t *data_size,
void *data, u64 *timep);
/**
* efi_set_variable() - set value of a UEFI variable
*
* @variable_name: name of the variable
* @vendor: vendor GUID
* @attributes: attributes of the variable
* @data_size: size of the buffer with the variable value
* @data: buffer with the variable value
* @ro_check: check the read only read only bit in attributes
* Return: status code
*/
efi_status_t efi_set_variable_int(u16 *variable_name, const efi_guid_t *vendor,
u32 attributes, efi_uintn_t data_size,
const void *data, bool ro_check);
/**
* efi_get_next_variable_name_int() - enumerate the current variable names
*
* @variable_name_size: size of variable_name buffer in byte
* @variable_name: name of uefi variable's name in u16
* @vendor: vendor's guid
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* Return: status code
*/
efi_status_t efi_get_next_variable_name_int(efi_uintn_t *variable_name_size,
u16 *variable_name,
efi_guid_t *vendor);
/**
* efi_query_variable_info_int() - get information about EFI variables
*
* This function implements the QueryVariableInfo() runtime service.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @attributes: bitmask to select variables to be
* queried
* @maximum_variable_storage_size: maximum size of storage area for the
* selected variable types
* @remaining_variable_storage_size: remaining size of storage are for the
* selected variable types
* @maximum_variable_size: maximum size of a variable of the
* selected type
* Returns: status code
*/
efi_status_t efi_query_variable_info_int(u32 attributes,
u64 *maximum_variable_storage_size,
u64 *remaining_variable_storage_size,
u64 *maximum_variable_size);
#endif
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