mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-24 20:13:39 +00:00
e618d1d285
In multiple places we need the default GUID matching a variable name. The patch provides a library function. For secure boot related variables like 'PK', 'KEK', 'db' a lookup table is used. For all other variable names EFI_GLOBAL_VARIABLE is returned. Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
336 lines
9.7 KiB
C
336 lines
9.7 KiB
C
/* 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)
|
|
|
|
enum efi_auth_var_type {
|
|
EFI_AUTH_VAR_NONE = 0,
|
|
EFI_AUTH_MODE,
|
|
EFI_AUTH_VAR_PK,
|
|
EFI_AUTH_VAR_KEK,
|
|
EFI_AUTH_VAR_DB,
|
|
EFI_AUTH_VAR_DBX,
|
|
EFI_AUTH_VAR_DBT,
|
|
EFI_AUTH_VAR_DBR,
|
|
};
|
|
|
|
/**
|
|
* 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(const 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(const 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);
|
|
|
|
#define EFI_VAR_FILE_NAME "ubootefi.var"
|
|
|
|
#define EFI_VAR_BUF_SIZE CONFIG_EFI_VAR_BUF_SIZE
|
|
|
|
/*
|
|
* This constant identifies the file format for storing UEFI variables in
|
|
* struct efi_var_file.
|
|
*/
|
|
#define EFI_VAR_FILE_MAGIC 0x0161566966456255 /* UbEfiVa, version 1 */
|
|
|
|
/**
|
|
* struct efi_var_entry - UEFI variable file entry
|
|
*
|
|
* @length: length of enty, multiple of 8
|
|
* @attr: variable attributes
|
|
* @time: authentication time (seconds since start of epoch)
|
|
* @guid: vendor GUID
|
|
* @name: UTF16 variable name
|
|
*/
|
|
struct efi_var_entry {
|
|
u32 length;
|
|
u32 attr;
|
|
u64 time;
|
|
efi_guid_t guid;
|
|
u16 name[];
|
|
};
|
|
|
|
/**
|
|
* struct efi_var_file - file for storing UEFI variables
|
|
*
|
|
* @reserved: unused, may be overwritten by memory probing
|
|
* @magic: identifies file format, takes value %EFI_VAR_FILE_MAGIC
|
|
* @length: length including header
|
|
* @crc32: CRC32 without header
|
|
* @var: variables
|
|
*/
|
|
struct efi_var_file {
|
|
u64 reserved;
|
|
u64 magic;
|
|
u32 length;
|
|
u32 crc32;
|
|
struct efi_var_entry var[];
|
|
};
|
|
|
|
/**
|
|
* efi_var_to_file() - save non-volatile variables as file
|
|
*
|
|
* File ubootefi.var is created on the EFI system partion.
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t efi_var_to_file(void);
|
|
|
|
/**
|
|
* efi_var_collect() - collect variables in buffer
|
|
*
|
|
* A buffer is allocated and filled with variables in a format ready to be
|
|
* written to disk.
|
|
*
|
|
* @bufp: pointer to pointer of buffer with collected variables
|
|
* @lenp: pointer to length of buffer
|
|
* @check_attr_mask: bitmask with required attributes of variables to be collected.
|
|
* variables are only collected if all of the required
|
|
* attributes are set.
|
|
* Return: status code
|
|
*/
|
|
efi_status_t __maybe_unused efi_var_collect(struct efi_var_file **bufp, loff_t *lenp,
|
|
u32 check_attr_mask);
|
|
|
|
/**
|
|
* efi_var_restore() - restore EFI variables from buffer
|
|
*
|
|
* Only if @safe is set secure boot related variables will be restored.
|
|
*
|
|
* @buf: buffer
|
|
* @safe: restoring from tamper-resistant storage
|
|
* Return: status code
|
|
*/
|
|
efi_status_t efi_var_restore(struct efi_var_file *buf, bool safe);
|
|
|
|
/**
|
|
* efi_var_from_file() - read variables from file
|
|
*
|
|
* File ubootefi.var is read from the EFI system partitions and the variables
|
|
* stored in the file are created.
|
|
*
|
|
* In case the file does not exist yet or a variable cannot be set EFI_SUCCESS
|
|
* is returned.
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t efi_var_from_file(void);
|
|
|
|
/**
|
|
* efi_var_mem_init() - set-up variable list
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t efi_var_mem_init(void);
|
|
|
|
/**
|
|
* efi_var_mem_find() - find a variable in the list
|
|
*
|
|
* @guid: GUID of the variable
|
|
* @name: name of the variable
|
|
* @next: on exit pointer to the next variable after the found one
|
|
* Return: found variable
|
|
*/
|
|
struct efi_var_entry *efi_var_mem_find(const efi_guid_t *guid, const u16 *name,
|
|
struct efi_var_entry **next);
|
|
|
|
/**
|
|
* efi_var_mem_del() - delete a variable from the list of variables
|
|
*
|
|
* @var: variable to delete
|
|
*/
|
|
void efi_var_mem_del(struct efi_var_entry *var);
|
|
|
|
/**
|
|
* efi_var_mem_ins() - append a variable to the list of variables
|
|
*
|
|
* The variable is appended without checking if a variable of the same name
|
|
* already exists. The two data buffers are concatenated.
|
|
*
|
|
* @variable_name: variable name
|
|
* @vendor: GUID
|
|
* @attributes: variable attributes
|
|
* @size1: size of the first data buffer
|
|
* @data1: first data buffer
|
|
* @size2: size of the second data field
|
|
* @data2: second data buffer
|
|
* @time: time of authentication (as seconds since start of epoch)
|
|
* Result: status code
|
|
*/
|
|
efi_status_t efi_var_mem_ins(const u16 *variable_name,
|
|
const efi_guid_t *vendor, u32 attributes,
|
|
const efi_uintn_t size1, const void *data1,
|
|
const efi_uintn_t size2, const void *data2,
|
|
const u64 time);
|
|
|
|
/**
|
|
* efi_var_mem_free() - determine free memory for variables
|
|
*
|
|
* Return: maximum data size plus variable name size
|
|
*/
|
|
u64 efi_var_mem_free(void);
|
|
|
|
/**
|
|
* efi_init_secure_state - initialize secure boot state
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t efi_init_secure_state(void);
|
|
|
|
/**
|
|
* efi_auth_var_get_type() - convert variable name and guid to enum
|
|
*
|
|
* @name: name of UEFI variable
|
|
* @guid: guid of UEFI variable
|
|
* Return: identifier for authentication related variables
|
|
*/
|
|
enum efi_auth_var_type efi_auth_var_get_type(const u16 *name,
|
|
const efi_guid_t *guid);
|
|
|
|
/**
|
|
* efi_auth_var_get_guid() - get the predefined GUID for a variable name
|
|
*
|
|
* @name: name of UEFI variable
|
|
* Return: guid of UEFI variable
|
|
*/
|
|
const efi_guid_t *efi_auth_var_get_guid(const u16 *name);
|
|
|
|
/**
|
|
* efi_get_next_variable_name_mem() - Runtime common code across efi variable
|
|
* implementations for GetNextVariable()
|
|
* from the cached memory copy
|
|
* @variable_name_size: size of variable_name buffer in byte
|
|
* @variable_name: name of uefi variable's name in u16
|
|
* @vendor: vendor's guid
|
|
*
|
|
* Return: status code
|
|
*/
|
|
efi_status_t __efi_runtime
|
|
efi_get_next_variable_name_mem(efi_uintn_t *variable_name_size, u16 *variable_name,
|
|
efi_guid_t *vendor);
|
|
/**
|
|
* efi_get_variable_mem() - Runtime common code across efi variable
|
|
* implementations for GetVariable() from
|
|
* the cached memory copy
|
|
*
|
|
* @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_runtime
|
|
efi_get_variable_mem(const u16 *variable_name, const efi_guid_t *vendor,
|
|
u32 *attributes, efi_uintn_t *data_size, void *data,
|
|
u64 *timep);
|
|
|
|
/**
|
|
* efi_get_variable_runtime() - runtime implementation of GetVariable()
|
|
*
|
|
* @variable_name: name of the variable
|
|
* @guid: 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 __efi_runtime EFIAPI
|
|
efi_get_variable_runtime(u16 *variable_name, const efi_guid_t *guid,
|
|
u32 *attributes, efi_uintn_t *data_size, void *data);
|
|
|
|
/**
|
|
* efi_get_next_variable_name_runtime() - runtime implementation of
|
|
* GetNextVariable()
|
|
*
|
|
* @variable_name_size: size of variable_name buffer in byte
|
|
* @variable_name: name of uefi variable's name in u16
|
|
* @guid: vendor's guid
|
|
* Return: status code
|
|
*/
|
|
efi_status_t __efi_runtime EFIAPI
|
|
efi_get_next_variable_name_runtime(efi_uintn_t *variable_name_size,
|
|
u16 *variable_name, efi_guid_t *guid);
|
|
|
|
/**
|
|
* efi_var_buf_update() - udpate memory buffer for variables
|
|
*
|
|
* @var_buf: source buffer
|
|
*
|
|
* This function copies to the memory buffer for UEFI variables. Call this
|
|
* function in ExitBootServices() if memory backed variables are only used
|
|
* at runtime to fill the buffer.
|
|
*/
|
|
void efi_var_buf_update(struct efi_var_file *var_buf);
|
|
|
|
#endif
|