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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>
78 lines
2.1 KiB
C
78 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* UEFI runtime variable services
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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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#include <common.h>
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#include <efi_loader.h>
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#include <efi_variable.h>
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/**
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* efi_efi_get_variable() - retrieve value of a UEFI variable
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*
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* This function implements the GetVariable runtime service.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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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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* Return: status code
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*/
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efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
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const efi_guid_t *vendor, u32 *attributes,
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efi_uintn_t *data_size, void *data)
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{
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efi_status_t ret;
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EFI_ENTRY("\"%ls\" %pUl %p %p %p", variable_name, vendor, attributes,
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data_size, data);
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ret = efi_get_variable_int(variable_name, vendor, attributes,
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data_size, data, NULL);
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/* Remove EFI_VARIABLE_READ_ONLY flag */
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if (attributes)
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*attributes &= EFI_VARIABLE_MASK;
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return EFI_EXIT(ret);
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}
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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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* This function implements the SetVariable runtime service.
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*
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* See the Unified Extensible Firmware Interface (UEFI) specification for
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* details.
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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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* Return: status code
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*/
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efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
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const efi_guid_t *vendor, u32 attributes,
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efi_uintn_t data_size, const void *data)
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{
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efi_status_t ret;
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EFI_ENTRY("\"%ls\" %pUl %x %zu %p", variable_name, vendor, attributes,
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data_size, data);
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/* Make sure that the EFI_VARIABLE_READ_ONLY flag is not set */
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if (attributes & ~(u32)EFI_VARIABLE_MASK)
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ret = EFI_INVALID_PARAMETER;
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else
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ret = efi_set_variable_int(variable_name, vendor, attributes,
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data_size, data, true);
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return EFI_EXIT(ret);
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}
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