include/efi_loader.h

   1 /*
   2  *  EFI application loader
   3  *
   4  *  Copyright (c) 2016 Alexander Graf
   5  *
   6  *  SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #ifndef _EFI_LOADER_H
  10 #define _EFI_LOADER_H 1
  11
  12 #include <common.h>
  13 #include <part_efi.h>
  14 #include <efi_api.h>
  15
  16 /* No need for efi loader support in SPL */
  17 #if defined(CONFIG_EFI_LOADER) && !defined(CONFIG_SPL_BUILD)
  18
  19 #include <linux/list.h>
  20
  21 int __efi_entry_check(void);
  22 int __efi_exit_check(void);
  23 const char *__efi_nesting(void);
  24 const char *__efi_nesting_inc(void);
  25 const char *__efi_nesting_dec(void);
  26
  27 /*
  28  * Enter the u-boot world from UEFI:
  29  */
  30 #define EFI_ENTRY(format, ...) do { \
  31         assert(__efi_entry_check()); \
  32         debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
  33                 __func__, ##__VA_ARGS__); \
  34         } while(0)
  35
  36 /*
  37  * Exit the u-boot world back to UEFI:
  38  */
  39 #define EFI_EXIT(ret) ({ \
  40         typeof(ret) _r = ret; \
  41         debug("%sEFI: Exit: %s: %u\n", __efi_nesting_dec(), \
  42                 __func__, (u32)((uintptr_t) _r & ~EFI_ERROR_MASK)); \
  43         assert(__efi_exit_check()); \
  44         _r; \
  45         })
  46
  47 /*
  48  * Call non-void UEFI function from u-boot and retrieve return value:
  49  */
  50 #define EFI_CALL(exp) ({ \
  51         debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
  52         assert(__efi_exit_check()); \
  53         typeof(exp) _r = exp; \
  54         assert(__efi_entry_check()); \
  55         debug("%sEFI: %lu returned by %s\n", __efi_nesting_dec(), \
  56               (unsigned long)((uintptr_t)_r & ~EFI_ERROR_MASK), #exp); \
  57         _r; \
  58 })
  59
  60 /*
  61  * Call void UEFI function from u-boot:
  62  */
  63 #define EFI_CALL_VOID(exp) do { \
  64         debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
  65         assert(__efi_exit_check()); \
  66         exp; \
  67         assert(__efi_entry_check()); \
  68         debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
  69         } while(0)
  70
  71 /*
  72  * Write an indented message with EFI prefix
  73  */
  74 #define EFI_PRINT(format, ...) ({ \
  75         debug("%sEFI: " format, __efi_nesting(), \
  76                 ##__VA_ARGS__); \
  77         })
  78
  79 extern struct efi_runtime_services efi_runtime_services;
  80 extern struct efi_system_table systab;
  81
  82 extern struct efi_simple_text_output_protocol efi_con_out;
  83 extern struct efi_simple_input_interface efi_con_in;
  84 extern struct efi_console_control_protocol efi_console_control;
  85 extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
  86
  87 uint16_t *efi_dp_str(struct efi_device_path *dp);
  88
  89 /* GUID of the EFI_BLOCK_IO_PROTOCOL */
  90 extern const efi_guid_t efi_block_io_guid;
  91 extern const efi_guid_t efi_global_variable_guid;
  92 extern const efi_guid_t efi_guid_console_control;
  93 extern const efi_guid_t efi_guid_device_path;
  94 /* GUID of the EFI_DRIVER_BINDING_PROTOCOL */
  95 extern const efi_guid_t efi_guid_driver_binding_protocol;
  96 extern const efi_guid_t efi_guid_loaded_image;
  97 extern const efi_guid_t efi_guid_device_path_to_text_protocol;
  98 extern const efi_guid_t efi_simple_file_system_protocol_guid;
  99 extern const efi_guid_t efi_file_info_guid;
 100
 101 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
 102 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
 103
 104 /*
 105  * When a protocol is opened a open protocol info entry is created.
 106  * These are maintained in a list.
 107  */
 108 struct efi_open_protocol_info_item {
 109         /* Link to the list of open protocol info entries of a protocol */
 110         struct list_head link;
 111         struct efi_open_protocol_info_entry info;
 112 };
 113
 114 /*
 115  * When the UEFI payload wants to open a protocol on an object to get its
 116  * interface (usually a struct with callback functions), this struct maps the
 117  * protocol GUID to the respective protocol interface
 118  */
 119 struct efi_handler {
 120         /* Link to the list of protocols of a handle */
 121         struct list_head link;
 122         const efi_guid_t *guid;
 123         void *protocol_interface;
 124         /* Link to the list of open protocol info items */
 125         struct list_head open_infos;
 126 };
 127
 128 /*
 129  * UEFI has a poor man's OO model where one "object" can be polymorphic and have
 130  * multiple different protocols (classes) attached to it.
 131  *
 132  * This struct is the parent struct for all of our actual implementation objects
 133  * that can include it to make themselves an EFI object
 134  */
 135 struct efi_object {
 136         /* Every UEFI object is part of a global object list */
 137         struct list_head link;
 138         /* The list of protocols */
 139         struct list_head protocols;
 140         /* The object spawner can either use this for data or as identifier */
 141         void *handle;
 142 };
 143
 144 /**
 145  * struct efi_event
 146  *
 147  * @type:               Type of event, see efi_create_event
 148  * @notify_tpl:         Task priority level of notifications
 149  * @trigger_time:       Period of the timer
 150  * @trigger_next:       Next time to trigger the timer
 151  * @nofify_function:    Function to call when the event is triggered
 152  * @notify_context:     Data to be passed to the notify function
 153  * @trigger_type:       Type of timer, see efi_set_timer
 154  * @queued:             The notification function is queued
 155  * @signaled:           The event occurred. The event is in the signaled state.
 156  */
 157 struct efi_event {
 158         uint32_t type;
 159         efi_uintn_t notify_tpl;
 160         void (EFIAPI *notify_function)(struct efi_event *event, void *context);
 161         void *notify_context;
 162         u64 trigger_next;
 163         u64 trigger_time;
 164         enum efi_timer_delay trigger_type;
 165         bool is_queued;
 166         bool is_signaled;
 167 };
 168
 169
 170 /* This list contains all UEFI objects we know of */
 171 extern struct list_head efi_obj_list;
 172
 173 /* Called by bootefi to make console interface available */
 174 int efi_console_register(void);
 175 /* Called by bootefi to make all disk storage accessible as EFI objects */
 176 efi_status_t efi_disk_register(void);
 177 /* Create handles and protocols for the partitions of a block device */
 178 int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
 179                                const char *if_typename, int diskid,
 180                                const char *pdevname);
 181 /* Called by bootefi to make GOP (graphical) interface available */
 182 int efi_gop_register(void);
 183 /* Called by bootefi to make the network interface available */
 184 int efi_net_register(void);
 185 /* Called by bootefi to make the watchdog available */
 186 int efi_watchdog_register(void);
 187 /* Called by bootefi to make SMBIOS tables available */
 188 void efi_smbios_register(void);
 189
 190 struct efi_simple_file_system_protocol *
 191 efi_fs_from_path(struct efi_device_path *fp);
 192
 193 /* Called by networking code to memorize the dhcp ack package */
 194 void efi_net_set_dhcp_ack(void *pkt, int len);
 195 /* Called by efi_set_watchdog_timer to reset the timer */
 196 efi_status_t efi_set_watchdog(unsigned long timeout);
 197
 198 /* Called from places to check whether a timer expired */
 199 void efi_timer_check(void);
 200 /* PE loader implementation */
 201 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
 202 /* Called once to store the pristine gd pointer */
 203 void efi_save_gd(void);
 204 /* Special case handler for error/abort that just tries to dtrt to get
 205  * back to u-boot world */
 206 void efi_restore_gd(void);
 207 /* Call this to relocate the runtime section to an address space */
 208 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
 209 /* Call this to set the current device name */
 210 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
 211 /* Add a new object to the object list. */
 212 void efi_add_handle(struct efi_object *obj);
 213 /* Create handle */
 214 efi_status_t efi_create_handle(efi_handle_t *handle);
 215 /* Delete handle */
 216 void efi_delete_handle(struct efi_object *obj);
 217 /* Call this to validate a handle and find the EFI object for it */
 218 struct efi_object *efi_search_obj(const efi_handle_t handle);
 219 /* Find a protocol on a handle */
 220 efi_status_t efi_search_protocol(const efi_handle_t handle,
 221                                  const efi_guid_t *protocol_guid,
 222                                  struct efi_handler **handler);
 223 /* Install new protocol on a handle */
 224 efi_status_t efi_add_protocol(const efi_handle_t handle,
 225                               const efi_guid_t *protocol,
 226                               void *protocol_interface);
 227 /* Delete protocol from a handle */
 228 efi_status_t efi_remove_protocol(const efi_handle_t handle,
 229                                  const efi_guid_t *protocol,
 230                                  void *protocol_interface);
 231 /* Delete all protocols from a handle */
 232 efi_status_t efi_remove_all_protocols(const efi_handle_t handle);
 233 /* Call this to create an event */
 234 efi_status_t efi_create_event(uint32_t type, efi_uintn_t notify_tpl,
 235                               void (EFIAPI *notify_function) (
 236                                         struct efi_event *event,
 237                                         void *context),
 238                               void *notify_context, struct efi_event **event);
 239 /* Call this to set a timer */
 240 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
 241                            uint64_t trigger_time);
 242 /* Call this to signal an event */
 243 void efi_signal_event(struct efi_event *event, bool check_tpl);
 244
 245 /* open file system: */
 246 struct efi_simple_file_system_protocol *efi_simple_file_system(
 247                 struct blk_desc *desc, int part, struct efi_device_path *dp);
 248
 249 /* open file from device-path: */
 250 struct efi_file_handle *efi_file_from_path(struct efi_device_path *fp);
 251
 252
 253 /* Generic EFI memory allocator, call this to get memory */
 254 void *efi_alloc(uint64_t len, int memory_type);
 255 /* More specific EFI memory allocator, called by EFI payloads */
 256 efi_status_t efi_allocate_pages(int type, int memory_type, efi_uintn_t pages,
 257                                 uint64_t *memory);
 258 /* EFI memory free function. */
 259 efi_status_t efi_free_pages(uint64_t memory, efi_uintn_t pages);
 260 /* EFI memory allocator for small allocations */
 261 efi_status_t efi_allocate_pool(int pool_type, efi_uintn_t size,
 262                                void **buffer);
 263 /* EFI pool memory free function. */
 264 efi_status_t efi_free_pool(void *buffer);
 265 /* Returns the EFI memory map */
 266 efi_status_t efi_get_memory_map(efi_uintn_t *memory_map_size,
 267                                 struct efi_mem_desc *memory_map,
 268                                 efi_uintn_t *map_key,
 269                                 efi_uintn_t *descriptor_size,
 270                                 uint32_t *descriptor_version);
 271 /* Adds a range into the EFI memory map */
 272 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 273                             bool overlap_only_ram);
 274 /* Called by board init to initialize the EFI drivers */
 275 efi_status_t efi_driver_init(void);
 276 /* Called by board init to initialize the EFI memory map */
 277 int efi_memory_init(void);
 278 /* Adds new or overrides configuration table entry to the system table */
 279 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
 280 /* Sets up a loaded image */
 281 efi_status_t efi_setup_loaded_image(
 282                         struct efi_loaded_image *info, struct efi_object *obj,
 283                         struct efi_device_path *device_path,
 284                         struct efi_device_path *file_path);
 285 efi_status_t efi_load_image_from_path(struct efi_device_path *file_path,
 286                                       void **buffer);
 287
 288 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 289 extern void *efi_bounce_buffer;
 290 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
 291 #endif
 292
 293
 294 struct efi_device_path *efi_dp_next(const struct efi_device_path *dp);
 295 int efi_dp_match(const struct efi_device_path *a,
 296                  const struct efi_device_path *b);
 297 struct efi_object *efi_dp_find_obj(struct efi_device_path *dp,
 298                                    struct efi_device_path **rem);
 299 unsigned efi_dp_size(const struct efi_device_path *dp);
 300 struct efi_device_path *efi_dp_dup(const struct efi_device_path *dp);
 301 struct efi_device_path *efi_dp_append(const struct efi_device_path *dp1,
 302                                       const struct efi_device_path *dp2);
 303 struct efi_device_path *efi_dp_append_node(const struct efi_device_path *dp,
 304                                            const struct efi_device_path *node);
 305
 306
 307 struct efi_device_path *efi_dp_from_dev(struct udevice *dev);
 308 struct efi_device_path *efi_dp_from_part(struct blk_desc *desc, int part);
 309 /* Create a device node for a block device partition. */
 310 struct efi_device_path *efi_dp_part_node(struct blk_desc *desc, int part);
 311 struct efi_device_path *efi_dp_from_file(struct blk_desc *desc, int part,
 312                                          const char *path);
 313 struct efi_device_path *efi_dp_from_eth(void);
 314 struct efi_device_path *efi_dp_from_mem(uint32_t mem_type,
 315                                         uint64_t start_address,
 316                                         uint64_t end_address);
 317 /* Determine the last device path node that is not the end node. */
 318 const struct efi_device_path *efi_dp_last_node(
 319                         const struct efi_device_path *dp);
 320 efi_status_t efi_dp_split_file_path(struct efi_device_path *full_path,
 321                                     struct efi_device_path **device_path,
 322                                     struct efi_device_path **file_path);
 323
 324 #define EFI_DP_TYPE(_dp, _type, _subtype) \
 325         (((_dp)->type == DEVICE_PATH_TYPE_##_type) && \
 326          ((_dp)->sub_type == DEVICE_PATH_SUB_TYPE_##_subtype))
 327
 328 /* Convert strings from normal C strings to uEFI strings */
 329 static inline void ascii2unicode(u16 *unicode, const char *ascii)
 330 {
 331         while (*ascii)
 332                 *(unicode++) = *(ascii++);
 333 }
 334
 335 static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
 336 {
 337         return memcmp(g1, g2, sizeof(efi_guid_t));
 338 }
 339
 340 /*
 341  * Use these to indicate that your code / data should go into the EFI runtime
 342  * section and thus still be available when the OS is running
 343  */
 344 #define __efi_runtime_data __attribute__ ((section ("efi_runtime_data")))
 345 #define __efi_runtime __attribute__ ((section ("efi_runtime_text")))
 346
 347 /* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
 348  * to make it available at runtime */
 349 void efi_add_runtime_mmio(void *mmio_ptr, u64 len);
 350
 351 /* Boards may provide the functions below to implement RTS functionality */
 352
 353 void __efi_runtime EFIAPI efi_reset_system(
 354                         enum efi_reset_type reset_type,
 355                         efi_status_t reset_status,
 356                         unsigned long data_size, void *reset_data);
 357 void efi_reset_system_init(void);
 358
 359 efi_status_t __efi_runtime EFIAPI efi_get_time(
 360                         struct efi_time *time,
 361                         struct efi_time_cap *capabilities);
 362 void efi_get_time_init(void);
 363
 364 #ifdef CONFIG_CMD_BOOTEFI_SELFTEST
 365 /*
 366  * Entry point for the tests of the EFI API.
 367  * It is called by 'bootefi selftest'
 368  */
 369 efi_status_t EFIAPI efi_selftest(efi_handle_t image_handle,
 370                                  struct efi_system_table *systab);
 371 #endif
 372
 373 efi_status_t EFIAPI efi_get_variable(s16 *variable_name,
 374                 efi_guid_t *vendor, u32 *attributes,
 375                 unsigned long *data_size, void *data);
 376 efi_status_t EFIAPI efi_get_next_variable(
 377                 unsigned long *variable_name_size,
 378                 s16 *variable_name, efi_guid_t *vendor);
 379 efi_status_t EFIAPI efi_set_variable(s16 *variable_name,
 380                 efi_guid_t *vendor, u32 attributes,
 381                 unsigned long data_size, void *data);
 382
 383 void *efi_bootmgr_load(struct efi_device_path **device_path,
 384                        struct efi_device_path **file_path);
 385
 386 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
 387
 388 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 389 #define __efi_runtime_data
 390 #define __efi_runtime
 391 static inline void efi_add_runtime_mmio(void *mmio_ptr, u64 len) { }
 392
 393 /* No loader configured, stub out EFI_ENTRY */
 394 static inline void efi_restore_gd(void) { }
 395 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 396                                    const char *path) { }
 397 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 398
 399 #endif /* CONFIG_EFI_LOADER && !CONFIG_SPL_BUILD */
 400
 401 #endif /* _EFI_LOADER_H */