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