include/efi_loader.h

   1 /* SPDX-License-Identifier: GPL-2.0+ */
   2 /*
   3  *  EFI application loader
   4  *
   5  *  Copyright (c) 2016 Alexander Graf
   6  */
   7
   8 #ifndef _EFI_LOADER_H
   9 #define _EFI_LOADER_H 1
  10
  11 #include <common.h>
  12 #include <part_efi.h>
  13 #include <efi_api.h>
  14
  15 static inline int guidcmp(const void *g1, const void *g2)
  16 {
  17         return memcmp(g1, g2, sizeof(efi_guid_t));
  18 }
  19
  20 static inline void *guidcpy(void *dst, const void *src)
  21 {
  22         return memcpy(dst, src, sizeof(efi_guid_t));
  23 }
  24
  25 /* No need for efi loader support in SPL */
  26 #if CONFIG_IS_ENABLED(EFI_LOADER)
  27
  28 #include <linux/list.h>
  29
  30 /* Maximum number of configuration tables */
  31 #define EFI_MAX_CONFIGURATION_TABLES 16
  32
  33 /* GUID used by the root node */
  34 #define U_BOOT_GUID \
  35         EFI_GUID(0xe61d73b9, 0xa384, 0x4acc, \
  36                  0xae, 0xab, 0x82, 0xe8, 0x28, 0xf3, 0x62, 0x8b)
  37 /* GUID used as host device on sandbox */
  38 #define U_BOOT_HOST_DEV_GUID \
  39         EFI_GUID(0xbbe4e671, 0x5773, 0x4ea1, \
  40                  0x9a, 0xab, 0x3a, 0x7d, 0xbf, 0x40, 0xc4, 0x82)
  41
  42 /* Use internal device tree when starting UEFI application */
  43 #define EFI_FDT_USE_INTERNAL NULL
  44
  45 /* Root node */
  46 extern efi_handle_t efi_root;
  47
  48 int __efi_entry_check(void);
  49 int __efi_exit_check(void);
  50 const char *__efi_nesting(void);
  51 const char *__efi_nesting_inc(void);
  52 const char *__efi_nesting_dec(void);
  53
  54 /*
  55  * Enter the u-boot world from UEFI:
  56  */
  57 #define EFI_ENTRY(format, ...) do { \
  58         assert(__efi_entry_check()); \
  59         debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
  60                 __func__, ##__VA_ARGS__); \
  61         } while(0)
  62
  63 /*
  64  * Exit the u-boot world back to UEFI:
  65  */
  66 #define EFI_EXIT(ret) ({ \
  67         typeof(ret) _r = ret; \
  68         debug("%sEFI: Exit: %s: %u\n", __efi_nesting_dec(), \
  69                 __func__, (u32)((uintptr_t) _r & ~EFI_ERROR_MASK)); \
  70         assert(__efi_exit_check()); \
  71         _r; \
  72         })
  73
  74 /*
  75  * Call non-void UEFI function from u-boot and retrieve return value:
  76  */
  77 #define EFI_CALL(exp) ({ \
  78         debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
  79         assert(__efi_exit_check()); \
  80         typeof(exp) _r = exp; \
  81         assert(__efi_entry_check()); \
  82         debug("%sEFI: %lu returned by %s\n", __efi_nesting_dec(), \
  83               (unsigned long)((uintptr_t)_r & ~EFI_ERROR_MASK), #exp); \
  84         _r; \
  85 })
  86
  87 /*
  88  * Call void UEFI function from u-boot:
  89  */
  90 #define EFI_CALL_VOID(exp) do { \
  91         debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
  92         assert(__efi_exit_check()); \
  93         exp; \
  94         assert(__efi_entry_check()); \
  95         debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
  96         } while(0)
  97
  98 /*
  99  * Write an indented message with EFI prefix
 100  */
 101 #define EFI_PRINT(format, ...) ({ \
 102         debug("%sEFI: " format, __efi_nesting(), \
 103                 ##__VA_ARGS__); \
 104         })
 105
 106 #ifdef CONFIG_SYS_CACHELINE_SIZE
 107 #define EFI_CACHELINE_SIZE CONFIG_SYS_CACHELINE_SIZE
 108 #else
 109 /* Just use the greatest cache flush alignment requirement I'm aware of */
 110 #define EFI_CACHELINE_SIZE 128
 111 #endif
 112
 113 /* Key identifying current memory map */
 114 extern efi_uintn_t efi_memory_map_key;
 115
 116 extern struct efi_runtime_services efi_runtime_services;
 117 extern struct efi_system_table systab;
 118
 119 extern struct efi_simple_text_output_protocol efi_con_out;
 120 extern struct efi_simple_text_input_protocol efi_con_in;
 121 extern struct efi_console_control_protocol efi_console_control;
 122 extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
 123 /* implementation of the EFI_DEVICE_PATH_UTILITIES_PROTOCOL */
 124 extern const struct efi_device_path_utilities_protocol
 125                                         efi_device_path_utilities;
 126 /* deprecated version of the EFI_UNICODE_COLLATION_PROTOCOL */
 127 extern const struct efi_unicode_collation_protocol
 128                                         efi_unicode_collation_protocol;
 129 /* current version of the EFI_UNICODE_COLLATION_PROTOCOL */
 130 extern const struct efi_unicode_collation_protocol
 131                                         efi_unicode_collation_protocol2;
 132 extern const struct efi_hii_config_routing_protocol efi_hii_config_routing;
 133 extern const struct efi_hii_config_access_protocol efi_hii_config_access;
 134 extern const struct efi_hii_database_protocol efi_hii_database;
 135 extern const struct efi_hii_string_protocol efi_hii_string;
 136 extern const struct efi_rng_protocol efi_rng_protocol;
 137
 138 uint16_t *efi_dp_str(struct efi_device_path *dp);
 139
 140 /* GUID of the U-Boot root node */
 141 extern const efi_guid_t efi_u_boot_guid;
 142 #ifdef CONFIG_SANDBOX
 143 /* GUID of U-Boot host device on sandbox */
 144 extern const efi_guid_t efi_guid_host_dev;
 145 #endif
 146 /* GUID of the EFI_BLOCK_IO_PROTOCOL */
 147 extern const efi_guid_t efi_block_io_guid;
 148 extern const efi_guid_t efi_global_variable_guid;
 149 extern const efi_guid_t efi_guid_console_control;
 150 extern const efi_guid_t efi_guid_device_path;
 151 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
 152 extern const efi_guid_t efi_guid_driver_binding_protocol;
 153 /* event group ExitBootServices() invoked */
 154 extern const efi_guid_t efi_guid_event_group_exit_boot_services;
 155 /* event group SetVirtualAddressMap() invoked */
 156 extern const efi_guid_t efi_guid_event_group_virtual_address_change;
 157 /* event group memory map changed */
 158 extern const efi_guid_t efi_guid_event_group_memory_map_change;
 159 /* event group boot manager about to boot */
 160 extern const efi_guid_t efi_guid_event_group_ready_to_boot;
 161 /* event group ResetSystem() invoked (before ExitBootServices) */
 162 extern const efi_guid_t efi_guid_event_group_reset_system;
 163 /* GUID of the device tree table */
 164 extern const efi_guid_t efi_guid_fdt;
 165 extern const efi_guid_t efi_guid_loaded_image;
 166 extern const efi_guid_t efi_guid_loaded_image_device_path;
 167 extern const efi_guid_t efi_guid_device_path_to_text_protocol;
 168 extern const efi_guid_t efi_simple_file_system_protocol_guid;
 169 extern const efi_guid_t efi_file_info_guid;
 170 /* GUID for file system information */
 171 extern const efi_guid_t efi_file_system_info_guid;
 172 extern const efi_guid_t efi_guid_device_path_utilities_protocol;
 173 /* GUID of the deprecated Unicode collation protocol */
 174 extern const efi_guid_t efi_guid_unicode_collation_protocol;
 175 /* GUID of the Unicode collation protocol */
 176 extern const efi_guid_t efi_guid_unicode_collation_protocol2;
 177 extern const efi_guid_t efi_guid_hii_config_routing_protocol;
 178 extern const efi_guid_t efi_guid_hii_config_access_protocol;
 179 extern const efi_guid_t efi_guid_hii_database_protocol;
 180 extern const efi_guid_t efi_guid_hii_string_protocol;
 181
 182 /* GUID of RNG protocol */
 183 extern const efi_guid_t efi_guid_rng_protocol;
 184
 185 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
 186 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
 187
 188 /**
 189  * struct efi_open_protocol_info_item - open protocol info item
 190  *
 191  * When a protocol is opened a open protocol info entry is created.
 192  * These are maintained in a list.
 193  *
 194  * @link:       link to the list of open protocol info entries of a protocol
 195  * @info:       information about the opening of a protocol
 196  */
 197 struct efi_open_protocol_info_item {
 198         struct list_head link;
 199         struct efi_open_protocol_info_entry info;
 200 };
 201
 202 /**
 203  * struct efi_handler - single protocol interface of a handle
 204  *
 205  * When the UEFI payload wants to open a protocol on an object to get its
 206  * interface (usually a struct with callback functions), this struct maps the
 207  * protocol GUID to the respective protocol interface
 208  *
 209  * @link:               link to the list of protocols of a handle
 210  * @guid:               GUID of the protocol
 211  * @protocol_interface: protocol interface
 212  * @open_infos          link to the list of open protocol info items
 213  */
 214 struct efi_handler {
 215         struct list_head link;
 216         const efi_guid_t *guid;
 217         void *protocol_interface;
 218         struct list_head open_infos;
 219 };
 220
 221 /**
 222  * enum efi_object_type - type of EFI object
 223  *
 224  * In UnloadImage we must be able to identify if the handle relates to a
 225  * started image.
 226  */
 227 enum efi_object_type {
 228         EFI_OBJECT_TYPE_UNDEFINED = 0,
 229         EFI_OBJECT_TYPE_U_BOOT_FIRMWARE,
 230         EFI_OBJECT_TYPE_LOADED_IMAGE,
 231         EFI_OBJECT_TYPE_STARTED_IMAGE,
 232 };
 233
 234 /**
 235  * struct efi_object - dereferenced EFI handle
 236  *
 237  * @link:       pointers to put the handle into a linked list
 238  * @protocols:  linked list with the protocol interfaces installed on this
 239  *              handle
 240  *
 241  * UEFI offers a flexible and expandable object model. The objects in the UEFI
 242  * API are devices, drivers, and loaded images. struct efi_object is our storage
 243  * structure for these objects.
 244  *
 245  * When including this structure into a larger structure always put it first so
 246  * that when deleting a handle the whole encompassing structure can be freed.
 247  *
 248  * A pointer to this structure is referred to as a handle. Typedef efi_handle_t
 249  * has been created for such pointers.
 250  */
 251 struct efi_object {
 252         /* Every UEFI object is part of a global object list */
 253         struct list_head link;
 254         /* The list of protocols */
 255         struct list_head protocols;
 256         enum efi_object_type type;
 257 };
 258
 259 /**
 260  * struct efi_loaded_image_obj - handle of a loaded image
 261  *
 262  * @header:             EFI object header
 263  * @exit_status:        exit status passed to Exit()
 264  * @exit_data_size:     exit data size passed to Exit()
 265  * @exit_data:          exit data passed to Exit()
 266  * @exit_jmp:           long jump buffer for returning form started image
 267  * @entry:              entry address of the relocated image
 268  */
 269 struct efi_loaded_image_obj {
 270         struct efi_object header;
 271         efi_status_t exit_status;
 272         efi_uintn_t *exit_data_size;
 273         u16 **exit_data;
 274         struct jmp_buf_data exit_jmp;
 275         EFIAPI efi_status_t (*entry)(efi_handle_t image_handle,
 276                                      struct efi_system_table *st);
 277         u16 image_type;
 278 };
 279
 280 /**
 281  * struct efi_event
 282  *
 283  * @link:               Link to list of all events
 284  * @queue_link:         Link to the list of queued events
 285  * @type:               Type of event, see efi_create_event
 286  * @notify_tpl:         Task priority level of notifications
 287  * @nofify_function:    Function to call when the event is triggered
 288  * @notify_context:     Data to be passed to the notify function
 289  * @group:              Event group
 290  * @trigger_time:       Period of the timer
 291  * @trigger_next:       Next time to trigger the timer
 292  * @trigger_type:       Type of timer, see efi_set_timer
 293  * @is_signaled:        The event occurred. The event is in the signaled state.
 294  */
 295 struct efi_event {
 296         struct list_head link;
 297         struct list_head queue_link;
 298         uint32_t type;
 299         efi_uintn_t notify_tpl;
 300         void (EFIAPI *notify_function)(struct efi_event *event, void *context);
 301         void *notify_context;
 302         const efi_guid_t *group;
 303         u64 trigger_next;
 304         u64 trigger_time;
 305         enum efi_timer_delay trigger_type;
 306         bool is_signaled;
 307 };
 308
 309 /* This list contains all UEFI objects we know of */
 310 extern struct list_head efi_obj_list;
 311 /* List of all events */
 312 extern struct list_head efi_events;
 313
 314 /**
 315  * struct efi_protocol_notification - handle for notified protocol
 316  *
 317  * When a protocol interface is installed for which an event was registered with
 318  * the RegisterProtocolNotify() service this structure is used to hold the
 319  * handle on which the protocol interface was installed.
 320  *
 321  * @link:       link to list of all handles notified for this event
 322  * @handle:     handle on which the notified protocol interface was installed
 323  */
 324 struct efi_protocol_notification {
 325         struct list_head link;
 326         efi_handle_t handle;
 327 };
 328
 329 /**
 330  * efi_register_notify_event - event registered by RegisterProtocolNotify()
 331  *
 332  * The address of this structure serves as registration value.
 333  *
 334  * @link:       link to list of all registered events
 335  * @event:      registered event. The same event may registered for multiple
 336  *              GUIDs.
 337  * @protocol:   protocol for which the event is registered
 338  * @handles:    linked list of all handles on which the notified protocol was
 339  *              installed
 340  */
 341 struct efi_register_notify_event {
 342         struct list_head link;
 343         struct efi_event *event;
 344         efi_guid_t protocol;
 345         struct list_head handles;
 346 };
 347
 348 /* List of all events registered by RegisterProtocolNotify() */
 349 extern struct list_head efi_register_notify_events;
 350
 351 /* Initialize efi execution environment */
 352 efi_status_t efi_init_obj_list(void);
 353 /* Install device tree */
 354 efi_status_t efi_install_fdt(void *fdt);
 355 /* Run loaded UEFI image */
 356 efi_status_t efi_run_image(void *source_buffer, efi_uintn_t source_size);
 357 /* Initialize variable services */
 358 efi_status_t efi_init_variables(void);
 359 /* Notify ExitBootServices() is called */
 360 void efi_variables_boot_exit_notify(void);
 361 /* Called by bootefi to initialize root node */
 362 efi_status_t efi_root_node_register(void);
 363 /* Called by bootefi to initialize runtime */
 364 efi_status_t efi_initialize_system_table(void);
 365 /* efi_runtime_detach() - detach unimplemented runtime functions */
 366 void efi_runtime_detach(void);
 367 /* Called by bootefi to make console interface available */
 368 efi_status_t efi_console_register(void);
 369 /* Called by bootefi to make all disk storage accessible as EFI objects */
 370 efi_status_t efi_disk_register(void);
 371 /* Create handles and protocols for the partitions of a block device */
 372 int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
 373                                const char *if_typename, int diskid,
 374                                const char *pdevname);
 375 /* Called by bootefi to make GOP (graphical) interface available */
 376 efi_status_t efi_gop_register(void);
 377 /* Called by bootefi to make the network interface available */
 378 efi_status_t efi_net_register(void);
 379 /* Called by bootefi to make the watchdog available */
 380 efi_status_t efi_watchdog_register(void);
 381 /* Called by bootefi to make SMBIOS tables available */
 382 /**
 383  * efi_acpi_register() - write out ACPI tables
 384  *
 385  * Called by bootefi to make ACPI tables available
 386  *
 387  * @return 0 if OK, -ENOMEM if no memory is available for the tables
 388  */
 389 efi_status_t efi_acpi_register(void);
 390 /**
 391  * efi_smbios_register() - write out SMBIOS tables
 392  *
 393  * Called by bootefi to make SMBIOS tables available
 394  *
 395  * @return 0 if OK, -ENOMEM if no memory is available for the tables
 396  */
 397 efi_status_t efi_smbios_register(void);
 398
 399 struct efi_simple_file_system_protocol *
 400 efi_fs_from_path(struct efi_device_path *fp);
 401
 402 /* Called by networking code to memorize the dhcp ack package */
 403 void efi_net_set_dhcp_ack(void *pkt, int len);
 404 /* Called by efi_set_watchdog_timer to reset the timer */
 405 efi_status_t efi_set_watchdog(unsigned long timeout);
 406
 407 /* Called from places to check whether a timer expired */
 408 void efi_timer_check(void);
 409 /* PE loader implementation */
 410 efi_status_t efi_load_pe(struct efi_loaded_image_obj *handle, void *efi,
 411                          struct efi_loaded_image *loaded_image_info);
 412 /* Called once to store the pristine gd pointer */
 413 void efi_save_gd(void);
 414 /* Special case handler for error/abort that just tries to dtrt to get
 415  * back to u-boot world */
 416 void efi_restore_gd(void);
 417 /* Call this to relocate the runtime section to an address space */
 418 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
 419 /* Call this to set the current device name */
 420 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
 421 /* Add a new object to the object list. */
 422 void efi_add_handle(efi_handle_t obj);
 423 /* Create handle */
 424 efi_status_t efi_create_handle(efi_handle_t *handle);
 425 /* Delete handle */
 426 void efi_delete_handle(efi_handle_t obj);
 427 /* Call this to validate a handle and find the EFI object for it */
 428 struct efi_object *efi_search_obj(const efi_handle_t handle);
 429 /* Load image */
 430 efi_status_t EFIAPI efi_load_image(bool boot_policy,
 431                                    efi_handle_t parent_image,
 432                                    struct efi_device_path *file_path,
 433                                    void *source_buffer,
 434                                    efi_uintn_t source_size,
 435                                    efi_handle_t *image_handle);
 436 /* Start image */
 437 efi_status_t EFIAPI efi_start_image(efi_handle_t image_handle,
 438                                     efi_uintn_t *exit_data_size,
 439                                     u16 **exit_data);
 440 /* Unload image */
 441 efi_status_t EFIAPI efi_unload_image(efi_handle_t image_handle);
 442 /* Find a protocol on a handle */
 443 efi_status_t efi_search_protocol(const efi_handle_t handle,
 444                                  const efi_guid_t *protocol_guid,
 445                                  struct efi_handler **handler);
 446 /* Install new protocol on a handle */
 447 efi_status_t efi_add_protocol(const efi_handle_t handle,
 448                               const efi_guid_t *protocol,
 449                               void *protocol_interface);
 450 /* Delete protocol from a handle */
 451 efi_status_t efi_remove_protocol(const efi_handle_t handle,
 452                                  const efi_guid_t *protocol,
 453                                  void *protocol_interface);
 454 /* Delete all protocols from a handle */
 455 efi_status_t efi_remove_all_protocols(const efi_handle_t handle);
 456 /* Install multiple protocol interfaces */
 457 efi_status_t EFIAPI efi_install_multiple_protocol_interfaces
 458                                 (efi_handle_t *handle, ...);
 459 /* Call this to create an event */
 460 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
 461                               void (EFIAPI *notify_function) (
 462                                         struct efi_event *event,
 463                                         void *context),
 464                               void *notify_context, efi_guid_t *group,
 465                               struct efi_event **event);
 466 /* Call this to set a timer */
 467 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
 468                            uint64_t trigger_time);
 469 /* Call this to signal an event */
 470 void efi_signal_event(struct efi_event *event);
 471
 472 /* open file system: */
 473 struct efi_simple_file_system_protocol *efi_simple_file_system(
 474                 struct blk_desc *desc, int part, struct efi_device_path *dp);
 475
 476 /* open file from device-path: */
 477 struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
 478
 479 /**
 480  * efi_size_in_pages() - convert size in bytes to size in pages
 481  *
 482  * This macro returns the number of EFI memory pages required to hold 'size'
 483  * bytes.
 484  *
 485  * @size:       size in bytes
 486  * Return:      size in pages
 487  */
 488 #define efi_size_in_pages(size) ((size + EFI_PAGE_MASK) >> EFI_PAGE_SHIFT)
 489 /* Generic EFI memory allocator, call this to get memory */
 490 void *efi_alloc(uint64_t len, int memory_type);
 491 /* More specific EFI memory allocator, called by EFI payloads */
 492 efi_status_t efi_allocate_pages(int type, int memory_type, efi_uintn_t pages,
 493                                 uint64_t *memory);
 494 /* EFI memory free function. */
 495 efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages);
 496 /* EFI memory allocator for small allocations */
 497 efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
 498                                void **buffer);
 499 /* EFI pool memory free function. */
 500 efi_status_t efi_free_pool(void *buffer);
 501 /* Returns the EFI memory map */
 502 efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 503                                 struct efi_mem_desc *memory_map,
 504                                 efi_uintn_t *map_key,
 505                                 efi_uintn_t *descriptor_size,
 506                                 uint32_t *descriptor_version);
 507 /* Adds a range into the EFI memory map */
 508 efi_status_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 509                                 bool overlap_only_ram);
 510 /* Adds a conventional range into the EFI memory map */
 511 efi_status_t efi_add_conventional_memory_map(u64 ram_start, u64 ram_end,
 512                                              u64 ram_top);
 513
 514 /* Called by board init to initialize the EFI drivers */
 515 efi_status_t efi_driver_init(void);
 516 /* Called by board init to initialize the EFI memory map */
 517 int efi_memory_init(void);
 518 /* Adds new or overrides configuration table entry to the system table */
 519 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
 520 /* Sets up a loaded image */
 521 efi_status_t efi_setup_loaded_image(struct efi_device_path *device_path,
 522                                     struct efi_device_path *file_path,
 523                                     struct efi_loaded_image_obj **handle_ptr,
 524                                     struct efi_loaded_image **info_ptr);
 525 /* Print information about all loaded images */
 526 void efi_print_image_infos(void *pc);
 527
 528 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 529 extern void *efi_bounce_buffer;
 530 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
 531 #endif
 532
 533
 534 struct efi_device_path *efi_dp_next(const struct efi_device_path *dp);
 535 int efi_dp_match(const struct efi_device_path *a,
 536                  const struct efi_device_path *b);
 537 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
 538                                    struct efi_device_path **rem);
 539 /* get size of the first device path instance excluding end node */
 540 efi_uintn_t efi_dp_instance_size(const struct efi_device_path *dp);
 541 /* size of multi-instance device path excluding end node */
 542 efi_uintn_t efi_dp_size(const struct efi_device_path *dp);
 543 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp);
 544 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
 545                                       const struct efi_device_path *dp2);
 546 struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
 547                                            const struct efi_device_path *node);
 548 /* Create a device path node of given type, sub-type, length */
 549 struct efi_device_path *efi_dp_create_device_node(const u8 type,
 550                                                   const u8 sub_type,
 551                                                   const u16 length);
 552 /* Append device path instance */
 553 struct efi_device_path *efi_dp_append_instance(
 554                 const struct efi_device_path *dp,
 555                 const struct efi_device_path *dpi);
 556 /* Get next device path instance */
 557 struct efi_device_path *efi_dp_get_next_instance(struct efi_device_path **dp,
 558                                                  efi_uintn_t *size);
 559 /* Check if a device path contains muliple instances */
 560 bool efi_dp_is_multi_instance(const struct efi_device_path *dp);
 561
 562 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
 563 /* Create a device node for a block device partition. */
 564 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);
 565 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
 566                                          const char *path);
 567 struct efi_device_path *efi_dp_from_eth(void);
 568 struct efi_device_path *efi_dp_from_mem(uint32_t mem_type,
 569                                         uint64_t start_address,
 570                                         uint64_t end_address);
 571 /* Determine the last device path node that is not the end node. */
 572 const struct efi_device_path *efi_dp_last_node(
 573                         const struct efi_device_path *dp);
 574 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
 575                                     struct efi_device_path **device_path,
 576                                     struct efi_device_path **file_path);
 577 efi_status_t efi_dp_from_name(const char *dev, const char *devnr,
 578                               const char *path,
 579                               struct efi_device_path **device,
 580                               struct efi_device_path **file);
 581
 582 #define EFI_DP_TYPE(_dp, _type, _subtype) \
 583         (((_dp)->type == DEVICE_PATH_TYPE_##_type) && \
 584          ((_dp)->sub_type == DEVICE_PATH_SUB_TYPE_##_subtype))
 585
 586 /*
 587  * Use these to indicate that your code / data should go into the EFI runtime
 588  * section and thus still be available when the OS is running
 589  */
 590 #define __efi_runtime_data __attribute__ ((section (".data.efi_runtime")))
 591 #define __efi_runtime __attribute__ ((section (".text.efi_runtime")))
 592
 593 /* Indicate supported runtime services */
 594 efi_status_t efi_init_runtime_supported(void);
 595
 596 /* Update CRC32 in table header */
 597 void __efi_runtime efi_update_table_header_crc32(struct efi_table_hdr *table);
 598
 599 /* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
 600  * to make it available at runtime */
 601 efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len);
 602
 603 /* Boards may provide the functions below to implement RTS functionality */
 604
 605 void __efi_runtime EFIAPI efi_reset_system(
 606                         enum efi_reset_type reset_type,
 607                         efi_status_t reset_status,
 608                         unsigned long data_size, void *reset_data);
 609
 610 /* Architecture specific initialization of the EFI subsystem */
 611 efi_status_t efi_reset_system_init(void);
 612
 613 efi_status_t __efi_runtime EFIAPI efi_get_time(
 614                         struct efi_time *time,
 615                         struct efi_time_cap *capabilities);
 616
 617 efi_status_t __efi_runtime EFIAPI efi_set_time(struct efi_time *time);
 618
 619 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 620 /*
 621  * Entry point for the tests of the EFI API.
 622  * It is called by 'bootefi selftest'
 623  */
 624 efi_status_t EFIAPI efi_selftest(efi_handle_t image_handle,
 625                                  struct efi_system_table *systab);
 626 #endif
 627
 628 efi_status_t EFIAPI efi_get_variable(u16 *variable_name,
 629                                      const efi_guid_t *vendor, u32 *attributes,
 630                                      efi_uintn_t *data_size, void *data);
 631 efi_status_t EFIAPI efi_get_next_variable_name(efi_uintn_t *variable_name_size,
 632                                                u16 *variable_name,
 633                                                const efi_guid_t *vendor);
 634 efi_status_t EFIAPI efi_set_variable(u16 *variable_name,
 635                                      const efi_guid_t *vendor, u32 attributes,
 636                                      efi_uintn_t data_size, const void *data);
 637
 638 efi_status_t EFIAPI efi_query_variable_info(
 639                         u32 attributes, u64 *maximum_variable_storage_size,
 640                         u64 *remaining_variable_storage_size,
 641                         u64 *maximum_variable_size);
 642
 643 /*
 644  * See section 3.1.3 in the v2.7 UEFI spec for more details on
 645  * the layout of EFI_LOAD_OPTION.  In short it is:
 646  *
 647  *    typedef struct _EFI_LOAD_OPTION {
 648  *        UINT32 Attributes;
 649  *        UINT16 FilePathListLength;
 650  *        // CHAR16 Description[];   <-- variable length, NULL terminated
 651  *        // EFI_DEVICE_PATH_PROTOCOL FilePathList[];
 652  *                                               <-- FilePathListLength bytes
 653  *        // UINT8 OptionalData[];
 654  *    } EFI_LOAD_OPTION;
 655  */
 656 struct efi_load_option {
 657         u32 attributes;
 658         u16 file_path_length;
 659         u16 *label;
 660         struct efi_device_path *file_path;
 661         const u8 *optional_data;
 662 };
 663
 664 void efi_deserialize_load_option(struct efi_load_option *lo, u8 *data);
 665 unsigned long efi_serialize_load_option(struct efi_load_option *lo, u8 **data);
 666 efi_status_t efi_bootmgr_load(efi_handle_t *handle);
 667
 668 #else /* CONFIG_IS_ENABLED(EFI_LOADER) */
 669
 670 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 671 #define __efi_runtime_data
 672 #define __efi_runtime
 673 static inline efi_status_t efi_add_runtime_mmio(void *mmio_ptr, u64 len)
 674 {
 675         return EFI_SUCCESS;
 676 }
 677
 678 /* No loader configured, stub out EFI_ENTRY */
 679 static inline void efi_restore_gd(void) { }
 680 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 681                                    const char *path) { }
 682 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 683 static inline void efi_print_image_infos(void *pc) { }
 684
 685 #endif /* CONFIG_IS_ENABLED(EFI_LOADER) */
 686
 687 #endif /* _EFI_LOADER_H */