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_inc(void);
  21 const char *__efi_nesting_dec(void);
  22
  23 /*
  24  * Enter the u-boot world from UEFI:
  25  */
  26 #define EFI_ENTRY(format, ...) do { \
  27         assert(__efi_entry_check()); \
  28         debug("%sEFI: Entry %s(" format ")\n", __efi_nesting_inc(), \
  29                 __func__, ##__VA_ARGS__); \
  30         } while(0)
  31
  32 /*
  33  * Exit the u-boot world back to UEFI:
  34  */
  35 #define EFI_EXIT(ret) ({ \
  36         typeof(ret) _r = ret; \
  37         debug("%sEFI: Exit: %s: %u\n", __efi_nesting_dec(), \
  38                 __func__, (u32)((uintptr_t) _r & ~EFI_ERROR_MASK)); \
  39         assert(__efi_exit_check()); \
  40         _r; \
  41         })
  42
  43 /*
  44  * Callback into UEFI world from u-boot:
  45  */
  46 #define EFI_CALL(exp) do { \
  47         debug("%sEFI: Call: %s\n", __efi_nesting_inc(), #exp); \
  48         assert(__efi_exit_check()); \
  49         exp; \
  50         assert(__efi_entry_check()); \
  51         debug("%sEFI: Return From: %s\n", __efi_nesting_dec(), #exp); \
  52         } while(0)
  53
  54 extern struct efi_runtime_services efi_runtime_services;
  55 extern struct efi_system_table systab;
  56
  57 extern const struct efi_simple_text_output_protocol efi_con_out;
  58 extern struct efi_simple_input_interface efi_con_in;
  59 extern const struct efi_console_control_protocol efi_console_control;
  60 extern const struct efi_device_path_to_text_protocol efi_device_path_to_text;
  61
  62 extern const efi_guid_t efi_guid_console_control;
  63 extern const efi_guid_t efi_guid_device_path;
  64 extern const efi_guid_t efi_guid_loaded_image;
  65 extern const efi_guid_t efi_guid_device_path_to_text_protocol;
  66
  67 extern unsigned int __efi_runtime_start, __efi_runtime_stop;
  68 extern unsigned int __efi_runtime_rel_start, __efi_runtime_rel_stop;
  69
  70 /*
  71  * When the UEFI payload wants to open a protocol on an object to get its
  72  * interface (usually a struct with callback functions), this struct maps the
  73  * protocol GUID to the respective protocol interface */
  74 struct efi_handler {
  75         const efi_guid_t *guid;
  76         void *protocol_interface;
  77 };
  78
  79 /*
  80  * UEFI has a poor man's OO model where one "object" can be polymorphic and have
  81  * multiple different protocols (classes) attached to it.
  82  *
  83  * This struct is the parent struct for all of our actual implementation objects
  84  * that can include it to make themselves an EFI object
  85  */
  86 struct efi_object {
  87         /* Every UEFI object is part of a global object list */
  88         struct list_head link;
  89         /* We support up to 8 "protocols" an object can be accessed through */
  90         struct efi_handler protocols[8];
  91         /* The object spawner can either use this for data or as identifier */
  92         void *handle;
  93 };
  94
  95 #define EFI_PROTOCOL_OBJECT(_guid, _protocol) (struct efi_object){      \
  96         .protocols = {{                                                 \
  97                 .guid = &(_guid),                                       \
  98                 .protocol_interface = (void *)(_protocol),              \
  99         }},                                                             \
 100         .handle = (void *)(_protocol),                                  \
 101 }
 102
 103 /**
 104  * struct efi_event
 105  *
 106  * @type:               Type of event, see efi_create_event
 107  * @notify_tpl:         Task priority level of notifications
 108  * @trigger_time:       Period of the timer
 109  * @trigger_next:       Next time to trigger the timer
 110  * @nofify_function:    Function to call when the event is triggered
 111  * @notify_context:     Data to be passed to the notify function
 112  * @trigger_type:       Type of timer, see efi_set_timer
 113  * @signaled:           The notify function was already called
 114  */
 115 struct efi_event {
 116         uint32_t type;
 117         UINTN notify_tpl;
 118         void (EFIAPI *notify_function)(struct efi_event *event, void *context);
 119         void *notify_context;
 120         u64 trigger_next;
 121         u64 trigger_time;
 122         enum efi_timer_delay trigger_type;
 123         int signaled;
 124 };
 125
 126
 127 /* This list contains all UEFI objects we know of */
 128 extern struct list_head efi_obj_list;
 129
 130 /* Called by bootefi to make console interface available */
 131 int efi_console_register(void);
 132 /* Called by bootefi to make all disk storage accessible as EFI objects */
 133 int efi_disk_register(void);
 134 /* Called by bootefi to make GOP (graphical) interface available */
 135 int efi_gop_register(void);
 136 /* Called by bootefi to make the network interface available */
 137 int efi_net_register(void **handle);
 138 /* Called by bootefi to make SMBIOS tables available */
 139 void efi_smbios_register(void);
 140
 141 /* Called by networking code to memorize the dhcp ack package */
 142 void efi_net_set_dhcp_ack(void *pkt, int len);
 143
 144 /* Called from places to check whether a timer expired */
 145 void efi_timer_check(void);
 146 /* PE loader implementation */
 147 void *efi_load_pe(void *efi, struct efi_loaded_image *loaded_image_info);
 148 /* Called once to store the pristine gd pointer */
 149 void efi_save_gd(void);
 150 /* Special case handler for error/abort that just tries to dtrt to get
 151  * back to u-boot world */
 152 void efi_restore_gd(void);
 153 /* Call this to relocate the runtime section to an address space */
 154 void efi_runtime_relocate(ulong offset, struct efi_mem_desc *map);
 155 /* Call this to set the current device name */
 156 void efi_set_bootdev(const char *dev, const char *devnr, const char *path);
 157 /* Call this to create an event */
 158 efi_status_t efi_create_event(uint32_t type, UINTN notify_tpl,
 159                               void (EFIAPI *notify_function) (
 160                                         struct efi_event *event,
 161                                         void *context),
 162                               void *notify_context, struct efi_event **event);
 163 /* Call this to set a timer */
 164 efi_status_t efi_set_timer(struct efi_event *event, enum efi_timer_delay type,
 165                            uint64_t trigger_time);
 166 /* Call this to signal an event */
 167 void efi_signal_event(struct efi_event *event);
 168
 169 /* Generic EFI memory allocator, call this to get memory */
 170 void *efi_alloc(uint64_t len, int memory_type);
 171 /* More specific EFI memory allocator, called by EFI payloads */
 172 efi_status_t efi_allocate_pages(int type, int memory_type, unsigned long pages,
 173                                 uint64_t *memory);
 174 /* EFI memory free function. */
 175 efi_status_t efi_free_pages(uint64_t memory, unsigned long pages);
 176 /* EFI memory allocator for small allocations */
 177 efi_status_t efi_allocate_pool(int pool_type, unsigned long size,
 178                                void **buffer);
 179 /* EFI pool memory free function. */
 180 efi_status_t efi_free_pool(void *buffer);
 181 /* Returns the EFI memory map */
 182 efi_status_t efi_get_memory_map(unsigned long *memory_map_size,
 183                                 struct efi_mem_desc *memory_map,
 184                                 unsigned long *map_key,
 185                                 unsigned long *descriptor_size,
 186                                 uint32_t *descriptor_version);
 187 /* Adds a range into the EFI memory map */
 188 uint64_t efi_add_memory_map(uint64_t start, uint64_t pages, int memory_type,
 189                             bool overlap_only_ram);
 190 /* Called by board init to initialize the EFI memory map */
 191 int efi_memory_init(void);
 192 /* Adds new or overrides configuration table entry to the system table */
 193 efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table);
 194
 195 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 196 extern void *efi_bounce_buffer;
 197 #define EFI_LOADER_BOUNCE_BUFFER_SIZE (64 * 1024 * 1024)
 198 #endif
 199
 200 /* Convert strings from normal C strings to uEFI strings */
 201 static inline void ascii2unicode(u16 *unicode, const char *ascii)
 202 {
 203         while (*ascii)
 204                 *(unicode++) = *(ascii++);
 205 }
 206
 207 static inline int guidcmp(const efi_guid_t *g1, const efi_guid_t *g2)
 208 {
 209         return memcmp(g1, g2, sizeof(efi_guid_t));
 210 }
 211
 212 /*
 213  * Use these to indicate that your code / data should go into the EFI runtime
 214  * section and thus still be available when the OS is running
 215  */
 216 #define __efi_runtime_data __attribute__ ((section ("efi_runtime_data")))
 217 #define __efi_runtime __attribute__ ((section ("efi_runtime_text")))
 218
 219 /* Call this with mmio_ptr as the _pointer_ to a pointer to an MMIO region
 220  * to make it available at runtime */
 221 void efi_add_runtime_mmio(void *mmio_ptr, u64 len);
 222
 223 /* Boards may provide the functions below to implement RTS functionality */
 224
 225 void __efi_runtime EFIAPI efi_reset_system(
 226                         enum efi_reset_type reset_type,
 227                         efi_status_t reset_status,
 228                         unsigned long data_size, void *reset_data);
 229 void efi_reset_system_init(void);
 230
 231 efi_status_t __efi_runtime EFIAPI efi_get_time(
 232                         struct efi_time *time,
 233                         struct efi_time_cap *capabilities);
 234 void efi_get_time_init(void);
 235
 236 #else /* defined(EFI_LOADER) && !defined(CONFIG_SPL_BUILD) */
 237
 238 /* Without CONFIG_EFI_LOADER we don't have a runtime section, stub it out */
 239 #define __efi_runtime_data
 240 #define __efi_runtime
 241 static inline void efi_add_runtime_mmio(void *mmio_ptr, u64 len) { }
 242
 243 /* No loader configured, stub out EFI_ENTRY */
 244 static inline void efi_restore_gd(void) { }
 245 static inline void efi_set_bootdev(const char *dev, const char *devnr,
 246                                    const char *path) { }
 247 static inline void efi_net_set_dhcp_ack(void *pkt, int len) { }
 248
 249 #endif