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efi_loader: prepare for read only OP-TEE variables

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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>
This commit is contained in:
Heinrich Schuchardt
2020-06-22 18:10:27 +02:00
parent 5a8d1f60b2
commit f2d2b3a11c
6 changed files with 193 additions and 181 deletions
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78
lib/efi_loader/efi_var_common.c Normal file
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// SPDX-License-Identifier: GPL-2.0+
/*
* UEFI runtime variable services
*
* Copyright (c) 2020, Heinrich Schuchardt <xypron.glpk@gmx.de>
*/
#include <common.h>
#include <efi_loader.h>
#include <efi_variable.h>
/**
* efi_efi_get_variable() - retrieve value of a UEFI variable
*
* This function implements the GetVariable runtime service.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @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
* Return: status code
*/
efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
const efi_guid_t *vendor, u32 *attributes,
efi_uintn_t *data_size, void *data)
{
efi_status_t ret;
EFI_ENTRY("\"%ls\" %pUl %p %p %p", variable_name, vendor, attributes,
data_size, data);
ret = efi_get_variable_int(variable_name, vendor, attributes,
data_size, data, NULL);
/* Remove EFI_VARIABLE_READ_ONLY flag */
if (attributes)
*attributes &= EFI_VARIABLE_MASK;
return EFI_EXIT(ret);
}
/**
* efi_set_variable() - set value of a UEFI variable
*
* This function implements the SetVariable runtime service.
*
* See the Unified Extensible Firmware Interface (UEFI) specification for
* details.
*
* @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
* Return: status code
*/
efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
const efi_guid_t *vendor, u32 attributes,
efi_uintn_t data_size, const void *data)
{
efi_status_t ret;
EFI_ENTRY("\"%ls\" %pUl %x %zu %p", variable_name, vendor, attributes,
data_size, data);
/* Make sure that the EFI_VARIABLE_READ_ONLY flag is not set */
if (attributes & ~(u32)EFI_VARIABLE_MASK)
ret = EFI_INVALID_PARAMETER;
else
ret = efi_set_variable_int(variable_name, vendor, attributes,
data_size, data, true);
return EFI_EXIT(ret);
}