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