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/* SPDX-License-Identifier: GPL-2.0+ */
* EFI application loader
* Copyright (c) 2016 Alexander Graf
#ifndef _EFI_LOADER_H
#define _EFI_LOADER_H 1
#include <common.h>
#include <part_efi.h>
#include <efi_api.h>
/* No need for efi loader support in SPL */
#include <linux/list.h>
/* Maximum number of configuration tables */
/* GUID used by the root node */
#define U_BOOT_GUID \
EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
int __efi_entry_check(void);
int __efi_exit_check(void);
const char *__efi_nesting(void);
const char *__efi_nesting_inc(void);
const char *__efi_nesting_dec(void);
* Enter the u-boot world from UEFI:
#define EFI_ENTRY(format, ...) do { \
assert(__efi_entry_check()); \
debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
__func__, ##__VA_ARGS__); \
} while(0)
* Exit the u-boot world back to UEFI:
#define EFI_EXIT(ret) ({ \
typeof(ret) _r = ret; \
debug("%sEFI: Exit: %s: %u\n", __efi_nesting_dec(), \
__func__, (u32)((uintptr_t) _r & ~EFI_ERROR_MASK)); \
assert(__efi_exit_check()); \
_r; \
* Call non-void UEFI function from u-boot and retrieve return value:
#define EFI_CALL(exp) ({ \
debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
assert(__efi_exit_check()); \
typeof(exp) _r = exp; \
assert(__efi_entry_check()); \
debug("%sEFI: %lu returned by %s\n", __efi_nesting_dec(), \
(unsigned long)((uintptr_t)_r & ~EFI_ERROR_MASK), #exp); \
_r; \
* Call void UEFI function from u-boot:
#define EFI_CALL_VOID(exp) do { \
debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
assert(__efi_exit_check()); \
exp; \
assert(__efi_entry_check()); \
debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
} while(0)
* Write an indented message with EFI prefix
#define EFI_PRINT(format, ...) ({ \
debug("%sEFI: " format, __efi_nesting(), \
##__VA_ARGS__); \
/* Just use the greatest cache flush alignment requirement I'm aware of */
/* Key identifying current memory map */
extern efi_uintn_t efi_memory_map_key;
extern struct efi_runtime_services efi_runtime_services;
extern struct efi_system_table systab;
extern struct efi_simple_text_output_protocol efi_con_out;
extern struct efi_simple_text_input_protocol efi_con_in;
extern struct efi_console_control_protocol efi_console_control;
extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
/* implementation of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL */
extern const struct efi_device_path_utilities_protocol
/* Implementation of the EFI_UNICODE_COLLATION_PROTOCOL */
extern const struct efi_unicode_collation_protocol
extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
extern const struct efi_hii_config_access_protocol efi_hii_config_access;
extern const struct efi_hii_database_protocol efi_hii_database;
extern const struct efi_hii_string_protocol efi_hii_string;
uint16_t *efi_dp_str(struct efi_device_path *dp);
/* GUID of the U-Boot root node */
extern const efi_guid_t efi_u_boot_guid;
extern const efi_guid_t efi_block_io_guid;
extern const efi_guid_t efi_global_variable_guid;
extern const efi_guid_t efi_guid_console_control;
extern const efi_guid_t efi_guid_device_path;
extern const efi_guid_t efi_guid_driver_binding_protocol;
/* event group ExitBootServices() invoked */
extern const efi_guid_t efi_guid_event_group_exit_boot_services;
/* event group SetVirtualAddressMap() invoked */
extern const efi_guid_t efi_guid_event_group_virtual_address_change;
/* event group memory map changed */
extern const efi_guid_t efi_guid_event_group_memory_map_change;
/* event group boot manager about to boot */
extern const efi_guid_t efi_guid_event_group_ready_to_boot;
/* event group ResetSystem() invoked (before ExitBootServices) */
extern const efi_guid_t efi_guid_event_group_reset_system;
/* GUID of the device tree table */
extern const efi_guid_t efi_guid_fdt;
extern const efi_guid_t efi_guid_loaded_image;
extern const efi_guid_t efi_guid_device_path_to_text_protocol;
extern const efi_guid_t efi_simple_file_system_protocol_guid;
extern const efi_guid_t efi_file_info_guid;
/* GUID for file system information */
extern const efi_guid_t efi_file_system_info_guid;
extern const efi_guid_t efi_guid_device_path_utilities_protocol;
/* GUID of the Unicode collation protocol */
extern const efi_guid_t efi_guid_unicode_collation_protocol;
extern const efi_guid_t efi_guid_hii_config_routing_protocol;
extern const efi_guid_t efi_guid_hii_config_access_protocol;
extern const efi_guid_t efi_guid_hii_database_protocol;
extern const efi_guid_t efi_guid_hii_string_protocol;
extern unsigned int __efi_runtime_start, __efi_runtime_stop;
extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
* When a protocol is opened a open protocol info entry is created.
* These are maintained in a list.
struct efi_open_protocol_info_item {
/* Link to the list of open protocol info entries of a protocol */
struct list_head link;
struct efi_open_protocol_info_entry info;
* When the UEFI payload wants to open a protocol on an object to get its
* interface (usually a struct with callback functions), this struct maps the
* protocol GUID to the respective protocol interface
struct efi_handler {
/* Link to the list of protocols of a handle */
struct list_head link;
const efi_guid_t *guid;
void *protocol_interface;
/* Link to the list of open protocol info items */
struct list_head open_infos;
* struct efi_object - dereferenced EFI handle
* @link: pointers to put the handle into a linked list
* @protocols: linked list with the protocol interfaces installed on this
* handle
* UEFI offers a flexible and expandable object model. The objects in the UEFI
* API are devices, drivers, and loaded images. struct efi_object is our storage
* structure for these objects.
* When including this structure into a larger structure always put it first so
* that when deleting a handle the whole encompassing structure can be freed.
* A pointer to this structure is referred to as a handle. Typedef efi_handle_t
* has been created for such pointers.
struct efi_object {
/* Every UEFI object is part of a global object list */
struct list_head link;
/* The list of protocols */
struct list_head protocols;
* struct efi_loaded_image_obj - handle of a loaded image
* @header: EFI object header
* @reloc_base: base address for the relocated image
* @reloc_size: size of the relocated image
* @exit_jmp: long jump buffer for returning form started image
* @entry: entry address of the relocated image
struct efi_loaded_image_obj {
struct efi_object header;
void *reloc_base;
aligned_u64 reloc_size;
efi_status_t exit_status;
struct jmp_buf_data exit_jmp;
EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
struct efi_system_table *st);
* struct efi_event
* @link: Link to list of all events
* @type: Type of event, see efi_create_event
* @notify_tpl: Task priority level of notifications
* @nofify_function: Function to call when the event is triggered
* @notify_context: Data to be passed to the notify function
* @group: Event group
* @trigger_time: Period of the timer
* @trigger_next: Next time to trigger the timer
* @trigger_type: Type of timer, see efi_set_timer
* @is_queued: The notification function is queued
* @is_signaled: The event occurred. The event is in the signaled state.
struct efi_event {
struct list_head link;
uint32_t type;
efi_uintn_t notify_tpl;
void (EFIAPI *notify_function)(struct efi_event *event, void *context);
void *notify_context;
const efi_guid_t *group;
u64 trigger_next;
u64 trigger_time;
enum efi_timer_delay trigger_type;
bool is_queued;
bool is_signaled;
/* This list contains all UEFI objects we know of */
extern struct list_head efi_obj_list;
/* List of all events */
extern struct list_head efi_events;
/* Initialize efi execution environment */
efi_status_t efi_init_obj_list(void);
/* Called by bootefi to initialize root node */
efi_status_t efi_root_node_register(void);
/* Called by bootefi to initialize runtime */
efi_status_t efi_initialize_system_table(void);
/* Called by bootefi to make console interface available */
efi_status_t efi_console_register(void);
/* Called by bootefi to make all disk storage accessible as EFI objects */
efi_status_t efi_disk_register(void);
/* Create handles and protocols for the partitions of a block device */
int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
const char *if_typename, int diskid,
const char *pdevname);
/* Called by bootefi to make GOP (graphical) interface available */
efi_status_t efi_gop_register(void);
/* Called by bootefi to make the network interface available */
efi_status_t efi_net_register(void);
/* Called by bootefi to make the watchdog available */
efi_status_t efi_watchdog_register(void);
/* Called by bootefi to make SMBIOS tables available */
* efi_acpi_register() - write out ACPI tables
* Called by bootefi to make ACPI tables available
* @return 0 if OK, -ENOMEM if no memory is available for the tables
efi_status_t efi_acpi_register(void);
* efi_smbios_register() - write out SMBIOS tables
* Called by bootefi to make SMBIOS tables available
* @return 0 if OK, -ENOMEM if no memory is available for the tables
efi_status_t efi_smbios_register(void);
struct efi_simple_file_system_protocol *
efi_fs_from_path(struct efi_device_path *fp);
/* Called by networking code to memorize the dhcp ack package */
void efi_net_set_dhcp_ack(void *pkt, int len);
/* Called by efi_set_watchdog_timer to reset the timer */
efi_status_t efi_set_watchdog(unsigned long timeout);
/* Called from places to check whether a timer expired */
void efi_timer_check(void);
/* PE loader implementation */
efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
struct efi_loaded_image *loaded_image_info);
/* Called once to store the pristine gd pointer */
void efi_save_gd(void);
/* Special case handler for error/abort that just tries to dtrt to get
* back to u-boot world */
void efi_restore_gd(void);
/* Call this to relocate the runtime section to an address space */
void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
/* Call this to set the current device name */
void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
/* Add a new object to the object list. */
void efi_add_handle(efi_handle_t obj);
/* Create handle */
efi_status_t efi_create_handle(efi_handle_t *handle);
/* Delete handle */
void efi_delete_handle(efi_handle_t obj);
/* Call this to validate a handle and find the EFI object for it */
struct efi_object *efi_search_obj(const efi_handle_t handle);
/* Start image */
efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
efi_uintn_t *exit_data_size,
u16 **exit_data);
/* Find a protocol on a handle */
efi_status_t efi_search_protocol(const efi_handle_t handle,
const efi_guid_t *protocol_guid,
struct efi_handler **handler);
/* Install new protocol on a handle */
efi_status_t efi_add_protocol(const efi_handle_t handle,
const efi_guid_t *protocol,
void *protocol_interface);
/* Delete protocol from a handle */
efi_status_t efi_remove_protocol(const efi_handle_t handle,
const efi_guid_t *protocol,
void *protocol_interface);
/* Delete all protocols from a handle */
efi_status_t efi_remove_all_protocols(const efi_handle_t handle);
/* Call this to create an event */
efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
void (EFIAPI *notify_function) (
struct efi_event *event,
void *context),
void *notify_context, efi_guid_t *group,
struct efi_event **event);
/* Call this to set a timer */
efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
uint64_t trigger_time);
/* Call this to signal an event */
void efi_signal_event(struct efi_event *event, bool check_tpl);
/* open file system: */
struct efi_simple_file_system_protocol *efi_simple_file_system(
struct blk_desc *desc, int part, struct efi_device_path *dp);
/* open file from device-path: */
struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
* efi_size_in_pages() - convert size in bytes to size in pages
* This macro returns the number of EFI memory pages required to hold 'size'
* bytes.
* @size: size in bytes
* Return: size in pages
#define efi_size_in_pages(size) ((size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
/* Generic EFI memory allocator, call this to get memory */
void *efi_alloc(uint64_t len, int memory_type);
/* More specific EFI memory allocator, called by EFI payloads */
efi_status_t efi_allocate_pages(int type, int memory_type, efi_uintn_t pages,
uint64_t *memory);
/* EFI memory free function. */
efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages);
/* EFI memory allocator for small allocations */
efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
void **buffer);
/* EFI pool memory free function. */
efi_status_t efi_free_pool(void *buffer);
/* Returns the EFI memory map */
efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
struct efi_mem_desc *memory_map,
efi_uintn_t *map_key,
efi_uintn_t *descriptor_size,
uint32_t *descriptor_version);
/* Adds a range into the EFI memory map */
uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
bool overlap_only_ram);
/* Called by board init to initialize the EFI drivers */
efi_status_t efi_driver_init(void);
/* Called by board init to initialize the EFI memory map */
int efi_memory_init(void);
/* Adds new or overrides configuration table entry to the system table */
efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
/* Sets up a loaded image */
efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
struct efi_device_path *file_path,
struct efi_loaded_image_obj **handle_ptr,
struct efi_loaded_image **info_ptr);
efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
void **buffer, efi_uintn_t *size);
/* Print information about all loaded images */
void efi_print_image_infos(void *pc);
extern void *efi_bounce_buffer;
#define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
struct efi_device_path *efi_dp_next(const struct efi_device_path *dp);
int efi_dp_match(const struct efi_device_path *a,
const struct efi_device_path *b);
struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
struct efi_device_path **rem);
/* get size of the first device path instance excluding end node */
efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp);
/* size of multi-instance device path excluding end node */
efi_uintn_t efi_dp_size(const struct efi_device_path *dp);
struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp);
struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
const struct efi_device_path *dp2);
struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
const struct efi_device_path *node);
/* Create a device path node of given type, sub-type, length */
struct efi_device_path *efi_dp_create_device_node(const u8 type,
const u8 sub_type,
const u16 length);
/* Append device path instance */
struct efi_device_path *efi_dp_append_instance(
const struct efi_device_path *dp,
const struct efi_device_path *dpi);
/* Get next device path instance */
struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
efi_uintn_t *size);
/* Check if a device path contains muliple instances */
bool efi_dp_is_multi_instance(const struct efi_device_path *dp);
struct efi_device_path *efi_dp_from_dev(struct udevice *dev);
struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
/* Create a device node for a block device partition. */
struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);
struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
const char *path);
struct efi_device_path *efi_dp_from_eth(void);
struct efi_device_path *efi_dp_from_mem(uint32_t mem_type,
uint64_t start_address,
uint64_t end_address);
/* Determine the last device path node that is not the end node. */
const struct efi_device_path *efi_dp_last_node(
const struct efi_device_path *dp);
efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
struct efi_device_path **device_path,
struct efi_device_path **file_path);
efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
const char *path,
struct efi_device_path **device,
struct efi_device_path **file);
#define EFI_DP_TYPE(_dp, _type, _subtype) \
(((_dp)->type == DEVICE_PATH_TYPE_##_type) && \
((_dp)->sub_type == DEVICE_PATH_SUB_TYPE_##_subtype))
* ascii2unicode() - convert ASCII string to UTF-16 string
* A zero terminated ASCII string is converted to a zero terminated UTF-16
* string. The output buffer must be preassigned.
* @unicode: preassigned output buffer for UTF-16 string
* @ascii: ASCII string to be converted
static inline void ascii2unicode(u16 *unicode, const char *ascii)
while (*ascii)
*(unicode++) = *(ascii++);
*unicode = 0;
static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
return memcmp(g1, g2, sizeof(efi_guid_t));
* Use these to indicate that your code / data should go into the EFI runtime
* section and thus still be available when the OS is running
#define __efi_runtime_data __attribute__ ((section (".data.efi_runtime")))
#define __efi_runtime __attribute__ ((section (".text.efi_runtime")))
/* Update CRC32 in table header */
void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table);
/* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
* to make it available at runtime */
efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len);
/* Boards may provide the functions below to implement RTS functionality */
void __efi_runtime EFIAPI efi_reset_system(
enum efi_reset_type reset_type,
efi_status_t reset_status,
unsigned long data_size, void *reset_data);
/* Architecture specific initialization of the EFI subsystem */
efi_status_t efi_reset_system_init(void);
efi_status_t __efi_runtime EFIAPI efi_get_time(
struct efi_time *time,
struct efi_time_cap *capabilities);
* Entry point for the tests of the EFI API.
* It is called by 'bootefi selftest'
efi_status_t EFIAPI efi_selftest(efi_handle_t image_handle,
struct efi_system_table *systab);
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 EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
u16 *variable_name,
const efi_guid_t *vendor);
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);
* See section 3.1.3 in the v2.7 UEFI spec for more details on
* the layout of EFI_LOAD_OPTION. In short it is:
* typedef struct _EFI_LOAD_OPTION {
* UINT32 Attributes;
* UINT16 FilePathListLength;
* // CHAR16 Description[]; <-- variable length, NULL terminated
* <-- FilePathListLength bytes
* // UINT8 OptionalData[];
struct efi_load_option {
u32 attributes;
u16 file_path_length;
u16 *label;
struct efi_device_path *file_path;
u8 *optional_data;
void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
void *efi_bootmgr_load(struct efi_device_path **device_path,
struct efi_device_path **file_path);
/* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
#define __efi_runtime_data
#define __efi_runtime
static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
/* No loader configured, stub out EFI_ENTRY */
static inline void efi_restore_gd(void) { }
static inline void efi_set_bootdev(const char *dev, const char *devnr,
const char *path) { }
static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
static inline void efi_print_image_infos(void *pc) { }
#endif /* _EFI_LOADER_H */